Download North Yaran Oil Field Development

North Yaran Oil Field Development
Cluster
Electrical Design Criteria
Contract No.: 73-93/10020
Owner Document Code:
NY-JS-000-EL-DSC-001-D2
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
D03
Page 1 of 4
North Yaran Oil Field Development
ELECTRICAL DESIGN CRITERIA
D1
D0
17.Jan.2016
31.Aug.2015
15.Feb.2015
Approved For Construction
Issued for Approval
Issued for Comment
R.G
R.G
S.A
M.K
M.K
R.G
M.D
M.D
A.T
Rev.
Date
Description
Prepared by
Checked by
Approved by
D2
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
Cluster
Electrical Design Criteria
Contract No.: 73-93/10020
NY-JS-000-EL-DSC-001-D2
Project
NYME
Owner Document Code:
Page
D0
D1
1
x x x x x
x
2
3
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x
D2
D3
Scope
CLNYEL
D4
Page
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ENEL
D0
D1
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D2
Serial
0001
D3
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D03
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Appendixes
App.
1
App.
2
App.
3
App.
4
App.
5
x
x
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

Revision Summary Index
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
Cluster
Electrical Design Criteria
Contract No.: 73-93/10020
Owner Document Code:

NY-JS-000-EL-DSC-001-D2
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
D03
Page 3 of 4
DETAIL DOCUMENT STATUS This Specification covers the Electrical Design Criteria for Oil Field Development Cluster Detail
Design Project. The mentioned project is sub-project of The North Yaran oil field development project.
The following annotations, as specified hereunder, have been used to indicate the type of change made to
the equivalent clause of basic document NY-000-EL-DSC-001-B4 (Electrical Design Criteria).
SUBSTITUTION:
The clause in basic specification shall be deleted and replaced by the new clause in this job
specification.
DELETION:
The clause in basic specification shall be deleted without any replacement.
ADDITION:
The new clause with the new number shall be added to the relevant section of basic specification.
MODIFICATION:
Part of the clause or paragraph in basic specification shall be modified and/or the new description
and/or statement shall be added to the clause or paragraph as given in this job specification.
Item
Basic Document
Clause
Statues
Description
1.
1.2
Substitution
Surface Facilities Engineering Consultant: Basic Stage
Engineering Consultant
2.
1.2
Addition
3.
3
Substitution
4.
5
Substitution
EPC Contractor: JondiShapour Company (JSC)
The environmental conditions, to be considered and shall
be according to Doc. No. NY-JS-000-PR-ESS-002 (Site
Condition Report)
NY-JS-000-EL-ESS-001
Specification
for
Power Transformer
NY-JS-000-EL-ESS-002
Specification for LV
/ MCC Switchgear
NY-JS-000-EL-ESS-003
Specification
for
MV Switchgear
NY-JS-000-EL-ESS-004
Specification
For
Low
Voltage
Induction Motors
NY-JS-000-EL-ESS-005
Specification
for
Power and Control
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
Cluster
Electrical Design Criteria
Contract No.: 73-93/10020
Owner Document Code:
NY-JS-000-EL-DSC-001-D2
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
D03
Page 4 of 4
Cables
Specification
for
UPS
NY-JS-000-EL-ESS-007
Specification
for
Battery Charger
NY-JS-000-EL-ESS-008
Specification
for
Cathodic Protection
NY-JS-000-EL-ESS-009
Specification
for
Diesel Generator
NY-JS-000-EL-ESS-010
Specification
for
Lighting and Small
power
NY-JS-000-EL-ESS-011
Specification
for
Earthing
&
Lightning Protection
NY-JS-000-EL-ESS-012
Specification
for
Installation of Elec.
Equipment
NY-JS-000-EL-ESS-013
Specification
for
Bulk material
NY-JS-000-EL-ESS-014
Specification
for
capacitor Bank
NY-JS-000-EL-ESS-015
Specification
for
Neutral Grounding
Resistor
NY-JS-000-EL-ESS-016
Specification
for
Medium
Voltage
Induction Motors
NY-JS-000-EL-ESS-017
Specification
for
Hazardous
Area
Classification
For list of signals to be monitor by DCS refer to below
Doc.:
- DCS IO list(NY-JS-200-IN-LST-003)
NY-JS-000-EL-ESS-006
5.
6.
15
Substitution
21.5
Substitution
- For detail information refer to Specification for Power
& Control Cables Doc No.NY-JS-000-EL-ESS-005.
This sentence:
Power supply for Cluster shall be derived from NGOSP
substation plant by means of two separate 33kv feeders.
D2
7.
8.1
Substitution
D2
8.
8.3
Deletion

BASIC DOCUMENT (ATTACHMENT) This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 1 of 26
North Yaran Oil Field Development
“Electrical Design Criteria”
B4
B3
B2
B1
B0
29.June.2014
12.May.2014
30.Mar.2014
23.Feb.2014
12.Jan.2014
Approved for Design
Approved for Design
Approved for Design
Issued for Approval
Issued for Review
A.Liaghatdar
A.Liaghatdar
A.Liaghatdar
A.Liaghatdar
A.Liaghatdar
M.Ebrahimpour
M.Ebrahimpour
M.Ebrahimpour
M.Ebrahimpour
M.Ebrahimpour
B.Ghamari
B.Ghamari
B.Ghamari
B.Ghamari
B.Ghamari
Rev.
Date
Description
Prepared by
Checked by
Approved by
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
Page
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Appendixes
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B3
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Revision Summary Index
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 3 of 26
TABLE OF CONTENTS
Page
1.0
INTRODUCTION ........................................................................................ 4
2.0
SCOPE ....................................................................................................... 5
3.0
SERVICE CONDITIONS ............................................................................ 5
4.0
STANDARDS AND CODES ....................................................................... 6
5.0
REFERENCED DOCUMENTS ................................................................... 7
6.0
SPECIAL CONSIDERATIONS ................................................................... 7
7.0
AREA CLASSIFICATION ............................................................................ 8
8.0
ELECTRICAL POWER SUPPLY AND DISTRIBUTION SYSTEM ........... 10
9.0
VOLTAGE LEVELS, FREQUENCY AND NEUTRAL SYSTEMS ............ 11
10.0 ALLOWABLE VOLTAGE DROP ............................................................... 12
11.0 POWER TRANSFORMERS ..................................................................... 12
12.0 SWITCHGEARS AND MOTOR CONTROL CENTERS ............................ 13
13.0 ELECTRIC MOTORS ................................................................................ 14
14.0 NEUTRAL GROUNDING RESISTORS ..................................................... 15
15.0 CONTROLS AND MONITORING .............................................................. 15
16.0 LIGHTING.................................................................................................. 15
17.0 SOCKET OUTLETS .................................................................................. 17
18.0 EARTHING & LIGHTNING PROTECTION ................................................ 17
19.0 EMERGENCY POWER SUPPLY .............................................................. 19
20.0 UNINTERRUPTIBLE SUPPLIES............................................................... 20
21.0 CABLES .................................................................................................... 20
22.0 SUBSTATION BUILDING .......................................................................... 22
23.0 CATHODIC PROTECTION ....................................................................... 23
24.0 EQUIPMENT ENCLOSURES .................................................................... 24
25.0 EQUIPMENT OPERATING VOLTAGES ................................................... 24
26.0 STUDIES ................................................................................................... 24
27.0 POWER FACTOR CORRECTION………………………..………………….26
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
1.0
INTRODUCTION
1.1
General Project Description
Type
DCEL
Serial
0001
Rev.
B02
Page 4 of 26
This document is provided for basic study/detail engineering of North Yaran oil
field development.
Yaran oil field, composed of Yaran north and Yaran south field, is located in the
Abadan plain area as far as 120 kilometers to the west of Ahwaz and right along
the international border with Iraq. The field is located adjacent to the west of the
South Azadegan giant oil field.
The major parts of projects are:
-
Wellhead facilities & flow lines.
Cluster (oil processing, gas processing and utilities).
Oil & gas transfer pipelines.
Power transmission line.
Permanent camp.
The crude oil and compressed gas will be exported via separate buried pipelines
to the West Karoun production unit and NGL-3200 respectively.
1.2
Project Definitions
This following definitions shall apply:
Owner:
National Iranian Oil Company (NIOC) /
Petroleum Engineering and Development
Company (PEDEC)
Buy back contractor:
PERSIA Oil & Gas Industry Development
Company (POGID)
Surface
Facilities
Consultant:
Engineering Enerchimi Engineering Company
Vendor/Supplier
Refers to firm or person who will supply and
/or fabricate the equipment or material.
Will:
Is normally used in connection with the
action by the "company" rather than by a
contractor, supplier or vendor.
May:
Is used where a provision is completely
discretionary.
Should:
Is used where a provision is advisory only.
Shall:
Is used where a provision is mandatory.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 5 of 26
2.0
SCOPE
2.1
This design criteria includes the requirements for the design of electrical systems
for using in NORTH YARAN oil field.
2.2
The scope of electrical design work includes the following items :
B4
3
-
33/6 KV and 6/33 KV and 6 /0.4 KV Indoor substation.
-
33 KV Power Transmission line.
-
33 KV switchgear
-
6 KV switchgear.
-
400 V switchgear and motor control centers (MCC).
-
Power transformers.
-
MV Cables.
-
600/1000 volt power and control cables.
-
Emergency diesel generator.
-
Uninterruptible power supply systems.
- Battery and Battery charger
3.0
-
Neutral grounding resistors.
-
Lighting & Sockets.
-
Earthing & Lightning.
-
Cathodic protection system .
SERVICE CONDITIONS
The equipment and all its components should be entirely suitable for use under
the site conditions, unless otherwise specified.
The environmental conditions, to be considered and shall be according to Doc. No.
NY-000-PR-ESS-002 (Site Condition Report).
For the environmental conditions special care will be paid to:
-
Enclosures of equipment for outdoor installation
Painting and coating of metal parts to resist to the severe environmental
conditions
Any environmental derating factors shall be considered by vendor before
design.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 6 of 26
4.0
STANDARDS AND CODES
4.1
All electrical equipment, materials and installations shall be in accordance with the
applicable portions of the latest edition of the following standards, codes and
recommendations:
-
International Electrotechnical Commission (IEC)
-
Iranian Petroleum Standard (IPS)
-
British Standards Institution (BSI)
-
American Petroleum Institute (API)
-
National Electric Manufacturers Association (NEMA)
-
Institute of Electrical and Electronic Engineering's (IEEE)
-
National Electrical Code (NEC)
-
Institute of Electrical Engineering (IEE)
-
Illumination Engineering Society (IES) / Chartered Institution of Building
Services Engineers (CIBSE)
4.2
Metric SI system of units shall be applied to all dimensions and documentations.
4.3
Document Priority
In the event of conflict between codes and standards and/or this Design criteria
and specification, the matter shall be highlighted for Client's attention/approval.
The priority of references stated in this Specification is as follow:
-
Equipment data sheet
Drawings.
This Design criteria
IPS
International Code & Standards
Applicable local Requirements.
In any case the vendor shall inform purchaser and obtain clarification before
proceeding with any work.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
5.0
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 7 of 26
REFERENCED DOCUMENTS
NY-000-EL-ESS-001
Specification for Power Transformer
NY-000-EL-ESS-002
Specification for LV / MCC Switchgear
NY-000-EL-ESS-003
Specification for MV Switchgear
NY-000-EL-ESS-004
Specification For Low Voltage Induction Motors
NY-000-EL-ESS-005
Specification for Power and Control Cables
NY-000-EL-ESS-006
Specification for UPS
NY-000-EL-ESS-007
Specification for Battery Charger
NY-000-EL-ESS-008
Specification for Cathodic Protection
NY-000-EL-ESS-009
Specification for Diesel Generator
NY-000-EL-ESS-010
Specification for Lighting and Small power
NY-000-EL-ESS-011 Specification for Earthing & Lightning Protection
NY-000-EL-ESS-012 Specification for Installation of Elec. Equipment
NY-000-EL-ESS-013 Specification for Bulk material
6.0
NY-000-EL-ESS-014
Specification for capacitor Bank
NY-000-EL-ESS-015
Specification for Neutral Grounding Resistor
NY-000-EL-ESS-016
Specification for Medium Voltage Induction Motors
NY-000-EL-ESS-017
Specification for Hazardous Area Classification
SPECIAL CONSIDERATIONS
6.1 The design of the electrical system shall be carried out in order to provide
safety to personnel and equipment during operation and maintenance,
reliability of service, easy maintenance, convenience of operation,
interchangeability of equipment, and adequate space for future extension and
modification.
6.2 All major electrical equipment shall be centralized, as far as possible, and
located in safe areas to make maximum use of industrial type transformers,
switchgears, motor control centers and panelboards.
6.3 Short circuit level of main switchgears,motor control centers and circuit
breakers shall not be less than:
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 8 of 26
25 KA for MV switchgear and motor control center
50 KA for Main LV switchgear and motor control center
6.4 In general, all supply feeders and transformers shall be designed and sized
with 20% spare capacity to cater for future loads.
6.5 Voltage insulation levels, interrupting capacities, continuous current
capacities, circuit protections, and mechanical strengths shall be selected and
coordinated in accordance with the calculations and recommendations of IEC,
or equivalent standards. Necessary calculations shall be made to insure that
all equipment are suitable for the duty required.
6.6 System protective devices (relays, fuses, breaker trip units, ... etc.) shall be
selected and coordinated to insure that the closest interrupter to the point of
short circuit (or high overload) shall open first and minimize disturbances on
the rest of the system.
6.7 Generally spare parts shall be in the form of individual parts except for capital
spares that are in complete set of main part of vital equipment. Manufacturer
shall guarantee supply of spare parts for min 20 years.
6.8 Documents including calculations, drawing, shall have sufficient and
necessary information for satisfactory operation, maintenance, trouble
shooting, calibration, spare part list and etc.
6.9 All guarantee figures shall be measure by sufficient and accurate metering
sys.
6.10 Equipment shall be designed and derated for local working Condition.
6.11 All explosion proof equipment shall be provided with international certificate.
7.0
AREA CLASSIFICATION
7.1
Classification of areas and installations shall be in accordance with API-RP
505 and (IEC 60079-10). All electrical equipment and materials shall be
suitable for the area classification of the locations to be installed and shall
comply with NEC standards or equivalent IEC recommendations.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
NY-000-EL-DSC-001-B4
Project
NYME
Owner Document Code:
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 9 of 26
7.2
Transformers, switchgears and motor control centers shall be located in safe
areas.
7.3
The methods used in the electrical installation and the type of enclosures for
all equipment and materials shall confirm to the applicable requirements of
the area classification.
All equipment which is considered as source of hazardous Gas or vapor
7.4
shall be shown on hazardous area classification layouts. Each source shall
be identified by equipment number, flammable materials handled and gas
group.
7.5
The classification extend of each area shall be shown in drawings with
equipment
7.6
7.7
indicated.
Classified area shall be considered as below:

Zone 0 (IEC 60079-10) or (API RP 505): Area in which an explosive gas
atmosphere is present continuously or is present for long periods.

Zone 1 (IEC 60079-10) or (API RP 505): Area in which an explosive gas
atmosphere can exist under normal operating conditions.

Zone 2 (IEC 60079-10) or (API RP 505): Area in which an explosive gas
atmosphere only occurs during abnormal operation or accidental failure.
Area adjacent to a Zone 1 and to which explosive gas atmosphere might
occasionally be communicated.
Electrical equipment in classified area shall be selected in accordance with
below table :
No
Description
Zone 1
Zone 2
1
Arcing and sparking
equipment
Flame proof (Ex-d)
Flame proof (Ex-d) or Increased
safety (Ex-de)
2
Non sparking
equipment
Flame proof (Ex-d) or
Increased safety (Ex-e)
Increased safety (Ex-e)
3
Lighting fixtures
Flame proof (Ex-d)
Ex-de
4
Motor
Flame proof (Ex-d)
Flame proof (Ex-d) or Increased
safety (Ex-e)
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 10 of 26
7.8
Minimum degree of Ingress protection (IP) for explosion proof equipment shall
be IP 54.
7.9 The electrical equipment installed in hazardous area shall be suitable for operate
with a minimum apparatus and temperature class IIB T3.
7.10 The electrical equipment shall not be installed in Zone 0.
8.0
ELECTRICAL POWER SUPPLY AND DISTRIBUTION SYSTEM
8.1 Cluster
Power supply for Cluster shall be derived from one of the substations of west
karoon power plant by means of two separate 33kv feeders. 33 kV, double
circuits overhead line will be constructed to supply power. 33 kv overhead lines
will be connected to 33 kv indoor switchgear.
In order to feed MV,LV and other consumers ,6kv and 0.4 kv switchgears will
be fed from 33/6 kv and 6/0.4kv transformers respectively.
In addition, 6/33kV transformers and 33kv feeders will be considered in cluster
to feed wellheads.
The capacity of each feeder shall meet the power demand requirements
including 100% of continuous loads+75% of intermittent loads +10% standby
loads plus a design margin of 20%.
B4
6 kv emergency diesel generators will be considered to feed emergency loads.
The generator sets will be started automatically within 15 seconds after total
power failure and will supply emergency power for safe plant shut-down and
vital consumers. Buses of emergency loads shall be separated after power
failure and supplied via distinct feeder.
These diesel generators will supply all electrical loads of plant.
The entire power supply and distribution system inside battery limits shall be
double radial type with normally open bus-tie breakers at the voltage levels of 33
kv,6 kV and 400/230 V.
Any partial power failure at one incomer shall initiate the automatic opening of
circuit breaker of the failed incomer and closing the bus tie breaker, the total load
of the switchgear shall be supplied by the 2nd Feeder.
B4
B4
8.2 Wellheads
Power supply for wellheads will be supplied from 33kv switchgear located in
cluster by means of double circuit 33kv overhead lines.
In each wellhead compact 33/0.4kv substation will be considered to supply
electrical loads.
8.3 Camp
Power supply for camp will be supplied from 33kv switchgear located in cluster
by means of single circuit 33kv overhead line.
In order to feed electrical consumers ,0.4 kv switchgear will be fed from
33/0.4kv Compact substation respectively.
0.4 kv emergency diesel generator will be considered to feed emergency loads.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 11 of 26
This diesel generator will supply all electrical loads of camp in early production
stage.
Any partial power failure at normal incomer shall initiate the automatic opening
of circuit breaker of the normal incomer and closing the emergency incomer
breaker, the total load of the switchgear shall be supplied by the emergency
diesel generator.
9.0
VOLTAGE LEVELS, FREQUENCY AND NEUTRAL SYSTEMS
Electrical equipment shall function satisfactorily during voltage fluctuations within
the voltage tolerance hereafter defined. AC electrical equipment shall function
satisfactorily at frequencies within plus or minus 2% of the stated frequency.
The applicable voltage levels, frequencies and neutral systems shall be as
follows:
VOLTAGES
VOLTAGE
TOLERANCE
FREQUENCY
± 10%
50 Hz
± 10%
50 Hz
± 10%
400V AC
NEUTRAL
SYSTEM
USE / REMARKS
To be verified
Main power supply
Motors rated above
including 1000 kW
50 Hz
Impedance : limited at 400 A
by resistors
3
phase
(neutral
not
distributed)
Impedance : limited at 400 A
by resistors
3 phase(neutral notdistributed)
± 10%
50 Hz
Neutral solidly earthed
230V AC
± 10%
50 Hz
Neutral solidly earthed
230V AC
from UPS
± 1%
50 Hz
NO neutral
400V/230V
AC
110V DC
From DC UPS
110V AC
± 10%
50 Hz
Neutral solidly earthed
33 KV
11kv or 6KV
AC
6 k V AC
± 1%
± 10%
NO neutral
50 Hz
NO neutral
and
Motors rated above 150 kw to
1000 kw
Emergency diesel generator
(For cluster )
Motors rated 0.4kW up to and
including 150 kW
Emergency diesel generator
(For Camp)
Other LV loads
Motors rated 0.4kW and
smaller .(If required)
Monitors,
Printers,Instrumentation,control
System
and
Packages.
Communication, CCTV and
radio system
Lighting + small power
Convenience outlets
Control and protection circuits
of switchgears
Part of control circuit of
switchgears
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
10.0
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 12 of 26
ALLOWABLE VOLTAGE DROP
The maximum allowable voltage drops, as a percentage of the system nominal
line to line voltage, shall be as follows:
a)
b)
c)
d)
e)
f)
g)
h)
11.0
Power transformers and secondary switchgear shall be connected by short
length of cable or bus-ducts which shall essentially have zero voltage drop.
Feeders to area sub-station
1%
Feeders from area sub-station
1%
Motor branch circuit (at full load )
2.5%
Power source to panel board
2%
Between lighting panel board and the most distant fixture ........................3%
The Maximum voltage drop to the terminal of motors at during motor starting
period ........................................................................................................15%
For Mv Motors the cable voltage drop at motor full load shall not
exceed............................................................................................ ......3.25%
POWER TRANSFORMERS
Each power transformer shall be capable of feeding the total load of the
corresponding switchboard. In normal condition, two power transformers shall
feed each switchboard, to meet the duplicate supply requirements, each providing
50% of total load.
Transformers dedicated to motors shall be rated according to the motor starting
and operating requirements.
Power transformers shall be oil-immersed type suitable for outdoor installation.
Power transformers shall be:

Hermetically sealed type up to and including 2500 kVA

Conservator type above 2500 kVA
For oil immersed transformers with ratings above 2500 kVA, the choice between
sealed and conservator type (or conservator type with air bag) shall be decided by
the purchaser or company representative. The selection of the transformer type
will be indicated in data sheet.
Transformers for lighting (when technical advantage) shall be dry type.
Power transformers shall be designed according to IEC 60076.
Power transformer data including, power, primary and secondary voltage and
short-circuit impedance shall be stated in the data-sheets.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
12.0
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 13 of 26
SWITCHGEARS AND MOTOR CONTROL CENTERS
12.1
12.1.1
General
Switchgear and MCC assemblies shall be free standing, vertical, dead
front structures, containing power buses, draw out type power circuit
breakers, necessary control devices, instrument transformers, relays, and
control and meter switches.
12.1.2 All switchgear and MCC cubicles shall be equipped with anti-condensation
space heaters.
12.1.3
All switchgears and MCC’s shall be suitable for indoor installation but
rated for the site maximum ambient temperature and shall be extendable at
both ends.
12.1.4 All switchgear components shall be able to withstand 40ºc (in HVAC failure)
and operate correctly.
12.2
MV Switchgears & MCC’s
12.2.1 MV switchgears & MCC’s shall be metal-clad type with isolated bus.
12.2.2 The circuit interrupting units shall be :
- Vacuum circuit breakers (VCB) shall be considered for incoming, bus
section, MV motors rated above 1000kw and Vacuum contactor(VCC)
shall be considered for MV motors rated 150kw to 1000kw.
12.2.3
The protection and metering of all feeders shall comply with the
requirements of IEC and IPS.
12.2.4
Unless otherwise specified, fully equipped spare cubicles shall be provided
on the basis of 10%, with minimum of 1 unit, for each different starter size.
12.3
LV Switchgears & MCC’s
12.3.1 LV switchgears & MCC’s shall be metal-enclosed and withdrawable type
with insulated copper buses.
12.3.2
Circuit breakers used as main or bus-tie breakers shall be air circuit
breaker type (A.C.B).
12.3.3 Starters for three phase LV motors shall be the combination type consisting
of a molded case circuit breaker and a magnetic contactor.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 14 of 26
12.3.4 Each starter shall have three phase ambient compensated thermal overload
protection and solid state single phasing protection.
12.3.5 Starters used for motors rated 4 KW and above shall be provided with an
ammeter on the starter front panel. They shall also be provided with a
current transformer for a remote mounted ammeter. (The secondary current
of this transformer shall be 1A.)
12.3.6 Starters for motors rated 18.5 KW and above (for zone 2 & safe areas) and
4 KW and above (for zone 1 areas) shall have an earth leakage protection.
13.0
12.3.7
Feeder circuits for heaters shall be similar to motor feeders except that no
protection relays will be necessary.
12.3.8
Feeder circuits for lighting panel boards and distribution boards rated 400
A and below will be of MCCB or HRC fuse type switch. For circuits rated
above 400 A, air circuit breakers shall be utilized.
12.3.9
Each MCC shall be provided with 20% spare units, fully equipped, for
different sizes of motor starters and 10% space units with empty cubicles.
ELECTRIC MOTORS
13.1
Three phase electric motors shall generally be squirrel cage induction type,
totally enclosed fan cooled (TEFC).
13.2
All motors shall have insulation class F and temperature raise B.
13.3
In general, the method of starting for all motors (< 1000 kw) shall be directon-line (D.O.L) starting at full voltage.( Starting method of large motors (=>
1000 kw) shall be decided in Detail design stage) .
13.4 All MV motors shall be provided with anti-condensation space heaters .
13.5 The winding temperature detectors shall be distributed at least two per phase
totally six numbers on each motor..
13.6
The motors up to and including 1000 kW shall be totally enclosed fan cooled
designated by characteristic numerals IC 4A1A1 (or simplified IC411) as
defined in IEC 60034-6 second edition.
13.7
The cooling method for motors above 1000 kW can be selected as IC 411,
IC 511 or IC 611 as defined in IEC 60034-6 second edition, and shall be
approved by company representative prior to manufacturing.
13.8
The degree of protection of motors and auxiliaries shall be at least IP 54W
according to IEC 60034-5. The degree of protection of terminal box and
bearing housings shall be IP 55W.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
13.9
14.0
15.0
16.0
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 15 of 26
The voltage of the motors rated 150 kW to 1000 kW shall be 6 kV. The
voltage of the motors above 1000 kW can be selected as 6 kV or 11 kV.
Selected voltage based on technical and economical considerations of the
electrical power supply system, in particular the voltage drop during starting
of the motor.
NEUTRAL GROUNDING RESISTORS(IF REQUIRED)
14.1
Neutral grounding resistors shall be grid type, fully insulated and housed in a
weatherproof heavy duty sheet steel enclosures.
14.2
The resistors shall be rated for 10 seconds full load under the site service
conditions.
CONTROLS AND MONITORING
15.1
The complete monitoring of the plant electrical distribution system and
emergency diesel generators shall be accomplished through the operator's
control console inside the control room via DCS. This monitoring system
shall be provided in order to show the single line diagram, with the status of
UPS and chargers and all MV circuit breakers (on, off), main busbar
(energizing, de-energizing) and to indicate and/or report the electrical
information for main feeders and MV motors (voltage, frequency, ampere,
active and reactive power, power factor). And information shall be recorded
for at least 72 hours.
For list of signals to be monitor by DCS refer to below Doc.:
- DCS IO list(NY-200-IN-LST-003)
- DCS IO list(NY-100-IN-LST-002)
15.2
Generally motors shall be controlled both at motor location and remote at
operator’s control console in the control room, via the plant DCS. However,
the selection of mode of operation will be at motor location.
15.3
Other feeder (All feeder except motor feeders) shall be controlled from its
panel at switchroom.
LIGHTING
16.1
Lighting circuits shall generally be 230 V, single phase, 50 Hertz supplied
from either 400/230 V three phase or 230 V single phase grounded neutral
system. Branch circuit protection shall be provided by fuse or miniature
circuit breakers (MCB’s). The incoming feeder of lighting panels shall be
equipped with earth leakage protection.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 16 of 26
16.2
The total estimated load of each circuit shall not exceed 80% of the branch
circuit rating.
16.3
Lighting methods and materials shall be suitable for the area classification in
which they are to be installed.
16.4
Approximately 10-30% of the lighting fittings in buildings, compressor and
utility shelters, under pipe racks, plant area perimeter fence security lighting
and inside Buildings shall be supplied from the emergency generation, but for
control room and substation it should be 50%. In addition, self contained
battery pack units shall be provided for control room, substation, and exit /
entrance ways.
16.5
Levels of illumination for the design of lighting systems shall be based on
IPS-E-EL-100, table 15 iIluminance currently recommended for the
petroleum, chemical and petrochemical industry.
16.6
General lighting of outdoor open areas, roads, security and perimeter fences
and on operating platforms will be provided by High pressure sodium flood
light and Street luminaries,supplemented by fluorescent luminaries to provide
adequate illumination. Fluorescent luminaries for general lighting shall be
provided with 2 x 36W bi-pin long life lamps and electronic ballast.
Emergency lighting shall be installed at strategic points in the installations,
including control rooms, substations, fire stations, first-aid rooms, watchmen’s
offices, the main entrances, and in all other buildings and areas where
required for safety reasons. Location and electrical arrangement shall be such
that danger to personnel in the case of a power failure is prevented, and
escape routes are lit.
16.7 For fence lighting, the fixtures with high pressure mercury vapor lamps or high
pressure sodium vapor lamps can be used, as selected by the Engineer.
Sodium vapor lamps shall not be used in areas where fire hazard is
envisaged.
special security fence lighting is required, unless otherwise specified, a
floodlight installation shall be designed, based on HP discharge lighting with a
minimum illumination of 10 lux (for CCTV Monitors) at any point in the area
between the fence and 5 m outside the fence.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
17.0
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 17 of 26
Socket outlets and their associated plugs, operating at different voltage
levels, shall not be interchangeable.
230 Volt Socket Outlets
17.2.1
Socket outlets for indoor, industrial areas shall be 3 wire, single phase,
2P+E, 16 A, interlocked, industrial type. For outdoor areas shall be as
above but with enclosure degree of protection IP 56.
17.2.2
230 V socket outlets shall be installed in electrical switchgear room for
testing purposes.
17.2.3
Socket outlets in office buildings shall be 3 wire, 2 pole with ground
contacts. The ground contacts shall be solidly and permanently connected
to the grounding system through a separate ground wire.
17.2.4
17.3
Project
NYME
SOCKET OUTLETS
17.1
17.2
NY-000-EL-DSC-001-B4
For office buildings, a minimum of three socket outlets shall be installed in
each room. Not more than 8 socket outlets shall be supplied by one circuit.
400 Volt Socket Outlets
17.3.1
Socket outlets for welding purposes shall be 5 wire, 4P+E, 3 phase+N+E,
63 A, industrial type. For outdoor areas it shall be as above but with
enclosure degree of protection IP 56.
17.3.2
One 400 V, 4 wire, 4P+E, 3 phase, 63 A socket outlet shall be installed
near each group of transformers, for oil treatment purposes.
18.0
EARTHING & LIGHTNING PROTECTION
18.1
A earthing loop system with radial taps to equipment shall be installed at each
plant to ensure safety to personnel and to equipment in case of electrical
equipment failures, and provide a path to ground for lightning and static electricity.
18.2
The earthing system shall be in accordance with IEC-364 part 3, TN-S system
and shall consist of main earthing conductors connected in ring formation via
earthing busbars with all earthing conductors being taped from the earthing
busbars. The earthing busbars shall be located above the ground and in suitable
locations and shall be connected to the station earthing network at both ends.
18.3
A lightning protection system shall be designed at each plant for substation and,
control building, and where required to discharge lightning stress to ground and to
protect personnel life in accordance with BS 6651 or NFPA 780.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 18 of 26
18.4
The resistance of the electrical earthing system shall not exceed 1 ohm, and for
the instrument earthing system shall not exceed 1 ohm.
18.5
The following equipment shall be connected to the grounding system :
-
Electric machine frames.
-
Non-current carrying metallic parts of electrical switchgears
-
Cable armoring
-
All structural metallic frames
-
Metal fences and gates
-
Metallic enclosures of electric equipment including cable boxes, push button
stations and frame of motors
-
Tanks, vessels, heat exchangers, and similar equipment not directly
connected to grounded supporting structures
-
Lighting poles or towers
-
Generator neutral point
-
400 V secondary neutral of power transformers
-
6000 V secondary neutral of power transformers (shall be separately earthed
through a grounding resistor)
-
Baseplate of rotating machinery
-
Lighting fittings and control panels
18.6
Tanks and process vessels containing flammable liquid shall be grounded at
several points (at least two per equipment).
18.7
The Earthing electrodes shall be driven copper rods.
18.8
Special attention shall be paid to electronic and instrumentation system earthing,
if required for computer and control system. These equipment shall be separately
earthed from the electrical earth system. This separate earth system called “clean
earth" or ”instrument earth” or ”computer earth” (less than 1 Ohm) as relevant,
can be one or a number of separate and independent earth system depending on
manufacturers requirement.
18.9
Earthing cable joints shall be :
-
Exothermic welding process (for underground)
Bolted or compression type joints (for aboveground)
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 19 of 26
19.0
EMERGENCY POWER SUPPLY
19.1
In case of main power failure, the following essential/critical loads of cluster and
wellheads shall be fed by a 6kv, 3 phase, 50 Hz diesel generator sets:
-
All electrical equipment of wellheads
-
Security and emergency lighting
-
AC &DC UPS systems
-
Control building air conditioning unit
-
Engine generator set cranking battery charger
-
Motor space heaters
-
Instrument air compressors
-
Telecommunication system
-
Flare igniters
-
Fire water pump
-
Fire water jokey pumps
-
CCTV
-
Package unit control panel
-
Other essential loads required by process
These diesel generators will supply all electrical loads in early production stage.
19.2
0.4 kv ,3 phase, 50 Hz diesel generator will be considered to feed electrical loads
of camp in case of main power failure .
19.3
Interlocked power circuit breaker complete with all required sensing relays and
controls shall automatically:
a)
b)
Initiate engine start upon out of tolerance main supply
Transfer to standby power
Retransfer to main power shall be manual
19.4
The engine generator sets shall be furnished with cranking batteries and battery
charger.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
20.0
UNINTERRUPTIBLE SUPPLIES
20.1
AC Uninterruptible Power Supplies (AC UPS)
Serial
0001
Rev.
B02
Page 20 of 26
Power to instruments system loads shall be supplied from dual redundant 230
VAC uninterruptible power supplies (UPS). These UPS shall include rectifiers /
chargers, static switches, inverter units and back up battery systems.
These UPS will be installed in control room.
Capacity shall be suitable for provision of full load requirements for at least 2
hours following failure of the AC supply. In addition redundant systems shall be
designed to supply the power demand during maintenance of the redundant
components.
Sensitivity of process and equipment to supply interruptions shall be determined
including changeover from main to redundant UPS Units.
Power to Telecommunication system shall be supplied from dedicated 230 VAC
UPS which will be installed in telecom building.
Telecom UPS shall be provided by vendor of Telecom system.
20.2
DC Uninterruptible Power Supplies (DC UPS)
Power for switchgear control shall be supply from 110DC units.
DC supply units shall consist of redundant rectifier charger battery units, each
capable of supplying the full load requirements. Switchgear batteries shall be
rated to supply the quiescent load for least 4 hours of the AC supply, and
subsequently to trip, close and retrip all circuit breakers.
The DC UPS consist of two similar static chargers each rated for 100% of rated
load and two battery banks each rated for 50% of rated load.
20.3
Batteries
Batteries shall have a guaranteed minimum life of 10 years.
The batteries shall be sealed or vented with minimum gas recombination – Nickel
Cadmium type.
Batteries shall be equipped with a system to carry out and control discharge tests
with a minimum of disturbance.
21.0
CABLES
21.1
Type of cables to be used for underground installation shall be :
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 21 of 26
MV cables
Stranded and annealed copper conductor, XLPE insulated, shielded, lead alloy
covering (if required), single galvanized steel wire armored and aluminum wire
Armore if single core cables are used , PVC sheathed and overall jacket.
600/1000 V power and control cables
Stranded and annealed copper conductor, PVC or XLPE insulated if required,
shielded, lead alloy covering if required, single galvanized steel wire armored ,
PVC sheathed and overall jacket.
Note: Armor will be deleted for interconnecting and indoor cables.
21.2
All cables shall be of continuous lengths, as far as possible.
21.3
Cables shall be sized in accordance with the relevant IEC recommendations and
considering the following:
-
Full load current in general, all feeder cables shall be sized to carry 125% of
the full load current of their circuits continuously, also to cater for short time
overloading.
-
Rating factors (where applicable) for ground temperature, ambient air
temperature, variation in thermal resistivity of soil, depth of laying and grouping
factor.
-
Short circuit
-
Voltage drop
-
Effect of sun radiation (cables should not be exposed to sun)
21.4
All of MV and LV cables shall be fire retardant type also emergency system (ESD,
F&G) cables shall be fire resistance type.
Cables in control room shall be LSOH (LOW SMOKE ZERO HALOGEN) type.
21.5
All of the cables in site area shall be buried in ground. They can be above ground
near junction boxes. Cables between junction boxes, lighting panels, lighting
equipments and socket outlets can be above ground.
- For detail information refer to Specification for Power & Control Cables Doc
No.NY-000-EL-ESS-005.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
21.6
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 22 of 26
Minimum Cable and Wire Size
MV cables: 50 Sq.mm
LV power and control cables: 2.5 Sq.mm
Power supply cables for motors: 4 Sq.mm
Lighting and small power wires and cables: 2.5 Sq.mm
Control cables inside of panels: 1.5 or 2.5 Sq.mm as per manufacturer's standard.
22.0
SUBSTATION BUILDING
22.1
The substation building shall be located in a non-hazardous area close to the load
center in order to reduce transmission losses, voltage drop, size and length of
cables.
22.2
The switchgear room shall be equipped with a suitable air conditioning and
ventilation system to prevent excess of heating and to give a positive pressure to
avoid dust entrance.
22.3
The minimum dimensions of the panel entrance door shall generally be 2.5 m
wide and 2.7 m high.
22.4
The battery room shall be provided with an Ex exhaust fan and supply air with
supply duct from HVAC system.
22.5
The switchgear room shall be generally sized taking into account the followings:
-
The dimensions of panels, equipment, and extensions anticipated.
-
Working area for maintenance in site.
-
Safe areas necessary for escape routes.
-
Areas necessary for grouping panels and equipment in accordance with
operating and/or safety requirements, and the need to reduce the length of
interconnecting cables.
-
Areas necessary to provide the layout of panels and equipment with an
acceptable aesthetic appearance.
-
Any modular arrangement in the building.
-
Areas required for cubicles provided for substation tools and accessories.
- Generally Substation shall include one room for medium voltage switchgear,one
room for LV switchgear and other low voltage panels and one room for MV
capacitor bank.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 23 of 26
23.0
CATHODIC PROTECTION
23.1
Cathodic protection system for the protection of all underground pipes and
pipelines shall be provided. The cathodic protection system to be used shall be
impressed current with manual control.
23.2
The cathodic protection system shall be designed in accordance with the National
Association of Corrosion Engineering (NACE) and British Standards (BS) 7361.
23.3
Transformer-rectifiers shall be oil immersed, SCR type and shall be operated on
400 V, 3 phase, 50 Hz, or 230 V, single phase.
23.4
Necessary test posts shall be installed along the protected underground pipelines
for periodic measurements of the metal to soil potential.
23.5
Impressed current anodes shall be high silicon cast iron or MMO type with a coke
breeze backfill, suitable for burial, and with sufficient quantity and size to have a
minimum life expectancy of 20 years. Anodes shall be buried to a depth sufficient
to provide adequate protection.
23.6
The protective potential along the underground pipes and pipelines shall not be
less than 0.9 volt negative with respect to copper/copper sulphate electrode cell,
neither shall be more than 1.35 Volt negative.
23.7
Cathodic protection transformer-rectifiers shall be located, as far as possible, in
locations where low voltage electrical power is available.
23.8
TYPES OF CATHODIC PROTECTION SYSTEMS
23.8.1 Impressed Current Systems
In this type of system, an external source of dc power, usually an ac/dc
transformer-rectifier, is used to provide the driving voltage between the anode and
the structure to be protected. The negative terminal of the dc source is connected
to the structure by a suitable cable and the positive terminal similarly connected to
the anode. The dc power source shall be adjustable so that variations in cathodic
protection current and voltage are available.
23.8.2 Galvanic Anode Systems
In a galvanic anode system, the driving voltage between the structure to be
protected and the anodes is provided directly by the potential difference between
the materials involved, If the galvanic anode is subject to possible wetting by oil,
Aluminum alloy or magnesium anodes shall be used. Galvanic anodes, either
singly or in groups or ribbon, are connected directly to the structure to be protected
and are consumed at a rate proportional to the current output.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
23.9
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 24 of 26
Test Stations
Stations providing facilities for cathodic protection measurements shall be
installed. Bonding stations which include bond current regulating resistors and
ammeter shunts shall be connected between main and secondary cathodically
protected structures so that the currents may be regulated and measured.
24.0
EQUIPMENT ENCLOSURES
24.1
All equipment shall be entirely suitable for the site service conditions, and shall be
protected against dust, humidity, saliferous and sulphurous atmosphere and
designed to obviate the entry of vermin and insects.
24.2
The degree of protection for all enclosures shall be to IEC 144 and as follows :
-
25.0
Indoor equipment
: IP 42 (minimum)
Outdoor equipment
: IP 54 (minimum)
Battery charger and UPS : IP 31 (minimum)
EQUIPMENT OPERATING VOLTAGES
Equipment shall be capable of continuous normal operation with the following
voltage tolerances:
26.0
●
Motors:
●
Lighting:
- Starting
- Running
: 80-100% of motor rated voltage
: System voltage (90-110%)
: System voltage (90-110%)
STUDIES
The following studies shall be performed for the distribution system and results
confirmed by repeat studies and reissued final reports when all plant data
becomes available.
All studies, settings and supporting calculations shall be submitted for approval by
the Company.
26.1
Load Flow Analysis
Studies shall use as base data the rated and absorbed power for all electrical
consumers at the switchboard or motor control centre to which they are
connected, the characteristics of each transformer, generator and cable and the
system configuration.
The studies shall show the following:
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:



NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 25 of 26
Maximum load (kW, kVA, power factor and kVAr) on each busbar.
Maximum load (kW, kVA, power factor and kVAr) on each transformer.
Voltage at each busbar.
The design of the distribution system and the ratings of equipment shall reflect the
results of the load flow analysis.
26.2
Short Circuit Analysis
Studies shall be performed in accordance with IEC 60909, and shall show
maximum and minimum prospective fault levels at each busbar for 3 phase, and
phase to earth faults.
The following parameters shall be calculated:





Initial symmetrical short circuit current I"k.
Peak short circuit current Ip.
Symmetrical short circuit breaking current Ib.
Steady state short circuit current Ik.
DC component of short circuit current Idc at the break point.
The electrical equipment shall be rated for operation on the electrical system,
taking into account the calculated fault levels.
26.3
Motor Starting Analysis
Studies shall determine the limits of the power system, in terms of voltage,
frequency and synchronism of elements during starting of large motors.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner
North Yaran Oil Field Development
ENERCHIMI
ELECTRICAL DESIGN CRITERIA
Contract No.: 71-92/10001
Owner Document Code:
27.0
NY-000-EL-DSC-001-B4
Project
NYME
Scope
CLNYEL
Disc.
ENEL
Type
DCEL
Serial
0001
Rev.
B02
Page 26 of 26
Power factor correction
Where the calculated system power factor at full load is less than 85% lagging,
capacitor bank/s shall be installed. The capacitor bank/s shall be sized to improve
the system power factor to 95% lagging at system full load.
In case where the calculated system power factor at full load is more than 85% but
less than 90% lagging, power factor correction capacitor/s will be required when
power is received from outside source/s. In such case the capacitor bank/s shall
be sized to improve the system power factor to 95% lagging at system full load.
B4
In this project, 33kV capacitor banks shall be installed for voltage improvement.
33kV capacitor bank on each busbar shall be divided into at least 3 Stages with
capability for switching steps automatically. Rating of each stage shall be finalized
by EPC contractor at detail design stage.
This document is the sole property of Petroleum Engineering and Development Company (PEDEC), all information contained herein may neither be
reproduced, used, disclosed, transmitted nor in any way made public without permission of the owner