Download switchgear spec manual12kv rev 5 2014

ATLANTIC CITY ELECTRIC COMPANY
EQUIPMENT REQUIREMENTS FOR
SINGLE OR MANUAL TRANSFER 12KV PRIMARY SERVICE
ATLANTIC REGION
CUSTOMER OPERATIONS
Rev 5 :
Feb 3 2014
(general)
J. Ciccone PE
INDEX
SECTION “A”
GENERAL INFORMATION
Page 2
SECTION “B”
ONE LINE DIAGRAM & LOAD LIMITS
Page 4
SECTION “C”
REQUIRED COMPONENTS AND
SPECIFICATIONS
Page 5
SECTION “D”
SWITCHGEAR CONTROL SYSTEM-NA
Page 8
SECTION “E”
OPERATING RESPONSIBILITIES
Page 10
SECTION “F”
ACCESSIBILITY
Page 10
SECTION “G”
STORM PROTECTION
Page 11
SECTION “H”
RATINGS
Page 11
ONE LINE DIAGRAMS
Page
SUPPLEMENTAL SPECIFICATIONS
Page 13
REMOTE CONTROL OPERATION-NA
Page 14
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Section A – GENERAL INFORMATION
1.
Customers requiring single or multiple feed, manual transfer three phase,
12.47KV service and desiring to use either metal clad switchgear or metal
enclosed interrupter switchgear must provide and install equipment meeting
these requirements in order to be connected to Atlantic Electric distribution lines.
2.
The customer’s supplier must certify that the equipment meets or exceeds the
applicable requirements of the National Electric Safety Code, ANSI C37.06 &
C37.20, IEEE Standard 27 (Standards for Switchgear Assemblies), and
applicable requirements of O.S.H.A. The customer’s supplier must also certify
that tests have been made to substantiate the basic impulse levels, short circuit
capabilities, load interrupting ratings and mechanical life capabilities of the
individual parts and assembly. Testing shall be performed by an approved testing
laboratory.
3.
Catalog data, design drawings and on-line diagrams including relaying schemes
and operating notes must be submitted to the Company before fabrication. The
Company will review the drawings, diagrams and operating notes to assure that
the switchgear includes the features listed below.
4.
Selection of a supplier is at the discretion of the customer. The customer should,
however, give careful consideration to the supplier’s experience in the field and
serviceability of the equipment.
5.
After installation of the customer’s switchgear, but prior to the installation of the
customer’s service entrance cable into the switchgear, an Atlantic Region
representative must be contacted for an initial inspection of the protective
equipment.
6.
After installation of the customer’s service entrance cable and prior to Atlantic
Region’s splicing or terminating this cable into the Atlantic system, the
customer’s service entrance cable shall be tested and certified to be in
satisfactory condition. The customer shall provide the Atlantic Region
representative with a certified copy of the test results.
7.
The Company reserves the right to inspect the service entrance facilities before
energizing. Such inspection, or failure to inspect, shall not render the company
liable or responsible for any loss or damage resulting from defects in the
installation or failure to comply with Company requirements.
8.
The following requirements are not intended to be a total specification for the
customer’s switchgear, but are features needed to interface with the Atlantic
Electric system.
SECTION B – ONE LINE DIAGRAM AND LOAD LIMITS
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1.
Based on load requirements, the customer shall select an incoming line
arrangement as shown on the one-line diagram page .
2.
Load limits are as follows:
Dedicated UG feeder
Non dedicated ug
MVA AMPS
MVA AMPS
12KV 8
355
4.4 200
3.
fed from Overhead
MVA AMPS
13.2 600
Coordination between Atlantic’s protective relays and the customer’s transformer
overload protection will establish the maximum size transformer and transformer
fuse (if used) that the customer may install. Electronic fuses may be necessary.
Customer will provide a protection study by a professional engineer ensuring
proper coordination.
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4.
In accordance with Atlantic City Electric’s Tariff for Electric Service, Terms and
Conditions of Service, Sect. 9.5, effective August 1, 1999. “The average power
factor under operating conditions of customer’s load at the point where the
electric service is metered shall be not less than 90%.”
5.
For the one-line diagram selected, the customer must install all equipment shown
and all service cable to the Company’s point of service before the Company will
provide service.
SECTION C – REQUIRED COMPONENTS AND SPECIFICATIONS
(See One-Line Diagram Page )
1.
Incoming line(s) shall be provided with manually controlled loadbreak interrupter
switches.
2.
No incoming service source will be permitted to operate in parallel with another
incoming service source either through a direct source bus tie or through any
secondary bus tie except by ACE Operating personnel on a temporary basis.
Any tie capable of paralleling one service source with another service source
must incorporate an interlock either mechanical or electrical, which will prevent
such operation, which can be overridden by ACE personnel only.
3.
A remote operated (handle) safety grounding switch shall be provided on the line
side of each incoming switch with a non-defeatable mechanical interlock to
prevent paralleling with the line switch. In addition, the ground switch shall have
an electrical interlock to prevent closing to a hot line. For metal enclosed
switchgear an open air load interrupter switch shall be provided for each
incoming line in conjunction with the ground switch.
4.
Line sensing PT shall be equipped with a hookstick operated 1.0 amp E type
fuse.
5.
Intermediate polymer type class surge arresters shall be provided on all incoming
lines (line side of switches). Porcelain arresters require barrier protection.
6.
All control panels and operating mechanisms shall be located in compartments
which are mechanically isolated from any high voltage terminals or bus work.
7.
The operating mechanisms for the load break switches must be provided with a
de-coupling feature to permit blocking of the mechanism without operation of the
loadbreak switches themselves.
8.
Metering cubicles shall be provided and be suitable to house three (3) current
transformers and three (3) potential transformers.
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The metering current and potential transformers will be furnished by customer to
Atlantic’s specifications for installation by the customer’s contractor.
The current transformer compartments shall be so designed that after proper
electrical isolation the transformers can be removed or changed.
The metering potential transformers are to be fused and connected through a
disconnecting device to permit changing the transformers without de-energizing
the main bus. Working clearances or barriers must be provided to meet the
requirements of OSHA 1926,950. Customer will furnish the current limiting
fuses and fused disconnects for installation on site by the switchgear
manufacturer or customer’s contractor. The fused disconnects shall be arranged
to allow hookstick removal from the cubicle.
Atlantic’s Meter Department will specify the actual number of current
transformers and potential transformers to be installed. Buswork and
connections are to be provided by the switchgear manufacturer and the
customer’s contractor. Grounding studs minimum ½ inch round by 3 inch copper
bearing alloy will be installed be installed on each side of the CT busbar
connections to facilitate safe replacement of metering CTs.
The metering cubicles shall have provisions to accept the standard Atlantic
meter seal and a padlock on the compartment door handle.
For single transformer installations, secondary compensated metering may be
used in lieu of primary metering. For overhead fed installations customer may
install a 45ft class 3 pole for Atlantic’s use as the metering point.
9.
For circuit breakers or fused loadbreak interrupter switches to the customer’s
load, the fuses or overload relays must be coordinated with the Atlantic’s
protective system and may limit the customer’s transformer size.
10.
Each compartment shall be freestanding and be able to withstand the stresses
and interruption of short circuit currents without distortion.
11.
Doors on compartments containing fused load break interrupter switches shall be
mechanically interlocked with the switch mechanism so that the switch must be
open before the fuse in that compartment can be accessed and the switch
cannot be closed while the door is open.
12.
Hinge pins must be stainless steel.
13.
Each bay containing primary voltage equipment or busses shall be provided with
a protective barrier or door, bolted closed, to prevent inadvertent access when
the enclosure door is opened.
14.
An inspection window or windows shall be provided in front of each interrupter
switch so that the open and closed positions are readily discernible.
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15.
Provisions for padlocking shall be provided on all handles.
16.
A ground bus shall extend the entire length of the switchgear attaching to each
individual compartment and with provision to connect a #2 to 500 kcmil copper
ground cable in each compartment. The ground bus shall have a momentary
rating at least equal to the highest momentary rating of a circuit breaker / fuse.
17.
Outdoor installations shall have the special features as described in paragraph
6.7.1 of ANSI-C37.20.
18.
All vent openings shall be screened and barriered and provided with dust filters.
19.
There shall not be any externally removable panels allowing access to high
voltages.
20.
Each compartment door shall be provided with a “CAUTION-----KEEP OUT----HIGH VOLTAGE” sign. All internal doors, bolted panels or partitions providing
access to high voltage equipment or busses shall be provided with a “DANGER----HIGH VOLTAGE-----QUALIFIED PERSONEL ONLY” sign. Manufacturer’s
standard signs with similar content are acceptable.
21.
The integrated switchgear assembly shall be provided with a nameplate(s)
indicating the manufacturer’s name & address and containing at a minimum the
following information:
a.
b.
c.
d.
Appropriate drawing numbers for integrated assembly.
Frequency rating.
Maximum design KV.
Basic impulse level.
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e.
f.
g.
h.
Main bus ampacity.
Momentary short circuit rating of integrated assembly (amperes,
asymmetrical).
MVA – 3 phase symmetrical at rated nominal voltage.
Factory order number.
In addition, each compartment containing an interrupter switch and/or fuse shall
be provided with a name plage(s) containing at a minimum the following switch
and/or fuse holder information:
a.
b.
c.
d.
e.
Continuous rating (amperes, RMS).
Interrupting rating (amperes, symmetrical at rated voltage).
Fault closing capability of the switch (amperes, asymmetrical).
Fuse size supplied.
Fuse manufacturer & catalog number of power fuse refill units.
22.
Load interrupter switches shall have the capability of interrupting 15 amperes of
charging current. Certified test data shall be provided to substantiate line and
cable drop ratings.
23.
For metal clad switchgear, a test / ground device shall be provided.
24.
Inter-compartment bus connections shall rely only on the insulating value of free
air to maintain the insulation levels of the entire assembly.
25.
All insulators shall be either porcelain or a polymer type such as silicon rubber or
cycloaliphatic resin.
SECTION D – SWITCHGEAR CONTROL SYSTEM-NA
SECTION E – OPERATING RESPONSIBILITIES
The Owner shall be responsible for determining all relay and timer settings and for the
physical adjustment of such relays and timers to assure the proper operation of the
switchgear in accordance with Section D of these requirements.
Atlantic will, on request, provide the source impedance (at the point of service) for each
circuit serving the project and the reclosing times of Atlantic’s circuit breakers protecting
these circuits.
The Owner shall be responsible for the testing and maintenance of switchgear and all
costs associated therewith.
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The Owner shall secure any required testing instructions from the manufacturer and
provide Atlantic with a copy of all instructions..
SECTION F – ACCESSIBILITY
The metering cubicle shall be accessible only to Atlantic and shall carry an Atlantic
padlock and meter seal.
The incoming line, bus tie compartments and their ground switch handles, and
compartments housing the control and electric operators shall carry the padlock of
Atlantic and shall be inaccessible to other parties except by prearrangement.
The compartment housing and fused units shall be under the padlock of the Owner. No
switching should be done without first notifying the Atlantic Region System Control
Center.
Atlantic Region personnel must have access to the switchgear at all times and be
allowed to perform switching essential to the operation of the incoming lines.
SECTION G – STORM PROTECTION
The switchgear shall be installed so that a flood tide of 12’ above mean sea level (MSL)
will not enter the cubicles. Special considerations may be necessary in FEMA V zones.
SECTION H – RATINGS
1.
Metal clad switchgear shall be rated 13.8 KV nominal, 1200 amp. Continuous
and 500 MVA interrupting capacity.
2.
Metal enclosed interrupter switchgear shall be rated as follows:
a.
b.
c.
d.
Nominal KV, maximum KV and insulation levels shall be as listed in Table
1 of ANSI C37.20 (1969) for 13.8 KV gear.
Current ratings of the bus and primary circuit components shall be 200
400 or 600 amperes continuous and 40,000 amperes asymmetrical
momentary.
Interrupter switches.
1.
2.
3.
Continuous rating
Momentary (10 cycle)
Fault closing
200 400 or 600 amp.
40,000 amp. Asym.
40,000 Amp. Asym. @ 13.8KV
4.
3 second rating
25,000 Amp Symmetric @ 13.8KV
Fuses and fuse holders.
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1.
e.
At 13.8KV a minimum three phase symmetrical interrupting
capacity of 500MVA based on an X/R ratio of 15 with asymmetry of
1.6. The fuse rating is not to exceed 200K amps and may be
limited to 100K or 140K depending on Atlantic’s circuit capabilities.
Use of electronic fuses may be necessary for coordination
purposes.
Ground switches shall be capable of withstanding short circuit forces
equal to the interrupting rating of the fuses.
.
f.
.Intermediate class surge arresters, capable of operating on a grounded
12.47KV wye system as applicable, shall be provided.
SUPPLEMENTAL SPECIFICATIONS
A.
Service Cables and Terminations
The customer shall install and own the service cables from Atlantic Electric’s
service manhole/pedestal/pole to the customer’s switchgear. These cables
should be designed, manufactured, and tested in accordance with the latest
edition of AEIC CS6 specification and other applicable industry standards and
specifications. They should be the following type:
1/0, 4/0, 500 or 750 Al or Cu EPR or tree retardant XLPE 15kv 220 mil
insulation having a semi-conducting or permashield covering. Flat strap
concentric, round concentric neutral or lead covering sufficient to
withstand a fault of 12,000 amps for 6 cycles. 95 mils fire resistant
chlorosulfonated polyethylene jacket. (Kerite Double Permashield is
acceptable.)
#1/0 or 4/0 AWG stranded copper ground conductor with weather resistant
cover (or 600v insulated), one conductor per circuit.
The connections in the point of interface will be made by Atlantic Electric.
Customer will supply all terminations. As directed by ACE, terminations may be a
200amp loadbreak, 600 amp deadbreak or indoor or outdoor type at the point of
interface. Terminations in the switchgear are the responsibility of the customer.
Primary terminations should be rated 15kv 125kv BIL for indoor and 25KV, 150
KV BIL for outdoor.
B.
Communications
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One outside phone lines are required. It will be installed to the metering
equipment located outside of the switchgear.
C.
Customer Responsibility
It is the responsibility of the customer to assure the current issue of this
document is referred to prior to commitment of switchgear purchase.
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