Download ECP 11-0213 Transformer (and Reactor) Test

Document Number: ECP 11-0213
Date: 30/01/2017
TRANSFORMER (AND REACTOR) TEST FORM
Substation Name
Substation Number
Circuit
General Data
Serial Number
Manufacturer
HV
Rating - CER
MVA
Rating - OFAF/ONA
MVA
Rating - ONAN(ON) AN
MVA
Nominal Voltage
LV1
LV2
Tertiary
kV
Full Load Current (normal tap)
A
Vector Group
Impedance %
HV/LV or HV/LV1
HV/T or HV/LV2
LV/T or LV1/LV2
Tapping Range (+% to -%)
in steps of
General Checks
% HV/LV
Winding
HV
LV
Co-ordinating gap electrodes positioned correctly
mm
Setting of co-ordinating gap
mm
Setting of bushing arcing horn gap (below 132kV)
All bushing and oil filled chambers oil levels correct
Air release plugs vented
Pressure relief diaphragm intact
Earthing connections satisfactory
All protective covers and shields fitted
All insulators undamaged and clean
Complete transformer oil tight
Painting visually satisfactory
All rating, diagram, identification plates, etc. fitted and satisfactory
Tightness of all fastenings
Dehydrating breathers satisfactory and pipework joints tight*
Refrigeration breathers satisfactory and pipework joints tight*
mm
THIS IS AN UNCONTROLLED DOCUMENT, THE READER MUST CONFIRM ITS VALIDITY BEFORE USE
Version: 3.0
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
General Checks
HV
LV
All cabling and wiring visually satisfactory
Kiosk and cubicle heaters operating satisfactorily
Interposing current transformers fitted and wired correctly
All compartments clean and tidy
All valves in correct operational position
All blanking plates satisfactory and correctly stored
General Tests
Core Primary Insulation
( or n/a)
Core (2000V AC or 2500V Insulations Resistance Tester)
Core to clamping structure (MΩ at…..)
Windings Primary Insulation
( or n/a)
Insulation resistance 100V DC (MΩ at……..)
HV
LV1
To all other windings, core frame and
tank connected together & earthed
Tertiary or LV2
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Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Ratio and Magnetising Current Tests
Ratio checked at all taps, and voltage continuity during tap changing. At the same time HV
magnetizing current measured on maximum, normal and minimum tapping positions (with a 3phase 4-wire low voltage supply connected to HV terminals and star point, with normal earth
connection to star point disconnected).
Tap Number
HV Voltage (V)
A-N
A-B
B-N
B-C
C-N
C-A
HV Magnetising
Current (mA)
A
B
C
LV1 Voltage (V)
a-N
a-b
b-N
b-c
Tertiary or LV1
Voltage (V)
c-N
c-a
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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3 of 12
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Vector Group Check
Connect one HV terminal to one LV (or Tertiary) terminal. With the transformer on nominal tap
measure the following voltages, as necessary.
HV - LV1
A-a2
A-b2
A-c2
B-a2
B-b2
B-c2
C-a2
C-b2
C-c2
A-
A-
A-
B-
B-
B-
C-
C-
C-
HV - LV2 or Tertiary
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4 of 12
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Vector symbol from test
Checking vector groups according to BS 171
BS 171
Vector Group
Vector Diagram
HV
LV
Combination of
HV and LV sides
for comparison
Dd0
Yy0
Connection for measuring of
vector position
Connect A to a. Energise terminals
ABC with three phase voltage.
Measure between Bb, Cc, AB, Bc
Voltage relationship:
1. Bb = Cc
2. Bb < AB
Dz0
Dd6
Yy6
3. Bb < Bc
Connect A to a. Energise terminals
ABC with three phase voltage.
Measure between Bb, Cc, AB, Bc
Voltage relationship:
1. Bb = Cc
2. Bb > AB
Dz6
Dy1
Yd1
3. Bb > Bc
Connect A to a. Energise terminals
ABC with three phase voltage.
Measure between Bb, Cc, AB, Bc
Voltage relationship:
1. Bb = Cc
2. Bb < AB
Yz1
Dy11
3. Bb < Bc
Connect A to a
Energise terminals ABC with threephase voltage
YD11
Measure between Bb, Cc, AB, Cb
Voltage relationship
1. Bb = Cc
Yz11
2. Bb < AB
3. Cc < Cb
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5 of 12
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Vector and Phasing Diagrams
Substation
Transformer Number
Voltage Ratio
MVA Rating
Group Reference to BS 171
Engineer Signature
Date
Vector Diagram
Primary HV
Tertiary or Secondary LV2
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Secondary LV
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Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Phasing Diagrams Transformer
HV Phase Colours
HV Terminal Markings
Note:
1.
Mark position of
cable boxes if fitted.
2.
Mark position of
neutral terminals.
3.
Mark position of
tertiary terminal and
identify.
A
n1
B
a1
b1
C
c1
n2
N
a2
b2
c2
LV Terminal Marking
LV Phase Colours
LV Switchgear incoming connections
looking at the front
LV Busbars arrangements and
incoming phase
colours looking at the
side
Back
Front
Motors and Overload Devices of Pumps, Fans and Tap Changer
Motor
Direction
of
Rotation
Correct
Overload Device
Set at
Rated
Current
A
Maximum Trip Operation Time
s
Starting with one
fuse removed
Running and one
fuse removed
Tap
changer
Pumps
Fans
Note: The above checks shall apply to individual motors and each phase of individual overload
devices. The values tabled shall be the maximum for any type of motor.
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7 of 12
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Buchholz Device
Transformer
Tap Changer
Serial Number
Manufacturer
Type
Inclination (degrees)
Longitudinal (3-7)
Lateral (0-5)
Quantity of air to operate
ml to make
Alarm contacts
ml to break
Approx. minimum air pressure to operate surge contacts and
type of equipment used
Check surge and gas contacts stable when starting coolers,
auto and manual with oil cold, and when pipework vibrates etc.
State oil temperature
Temperature Indicators
Number 1
Number 2
Number 3
Manufacturer
Serial Number
Associated Winding
Contact
Function
Setting
Function
Setting
Function
Setting
Contact
Function
& Setting
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8 of 12
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
WTI Heater Coil Circuits
Note, where tests have been carried out at the Contractor’s works, these are required only as
approximate check tests
Number 1
Number 2
Number 3
CT Ratio
Ratio confirmed on load or by primary
injection (record results on test form
ECP 11-0303)
Heater coil resistance
Nominal
ONAN
Shunt resistance across
heater coil

Heater coil test: current
injected (FLC)
A
Top oil temperature
°C
Initial temperature
°C
Steady temperature after
minutes
°C
Temperature increment
°C
OFAF
ONAN
OFAF
ONAN
OFAF
Calibration test on WTI indications and adjustment on repeaters
Number 1 WTI
WTI
Repeater
Test Temperature
°C
Indicator Reading
°C
Indicator Reading
°C
Repeater/Telecontrol
Reading
°C
Inspection of Site Wiring
Number 2 WTI
Number 3 WTI
( or n/a)
Insulation (see test forms ECP 11-0301 and ECP 11-0217)
Kiosk, tap change
and cooling
equipment wiring
checked to:
Circuit Diagram Number
…………………………………..
Revision ............
Wiring Diagram Number
…………………………………..
Revision ............
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9 of 12
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Operational Tests
( or n/a)
Tap Change Equipment
Raise
Lower
Cooler B
Cooler C
Maximum interval between operating times of Diverter Switches of single
phase tap changers*
Local raising and lowering (full range)
Remote raising and lowering (full range)
Local/Remote Switch
Stepping Relay
Hand operation and handle interlock switch
Check maintaining circuit for correct sequence
Limit switches proved (in motor and control circuits)
Mechanical position indicator
Remote electrical position indicator including accurate indication of all
positions
Tap Change Incomplete Alarm including accurate indication of all
positions
Tap Change Counter operates correctly
Tap Change Counter Reading Initial/Final
Cooling Equipment
Operations, Alarms & Indications
Cooler A
Cooler control switch
Auto control from WTI
Time delay for pumps (Auto)
s
Time delay for pumps (Manual)
s
Differential pressure alarm
Pump failure alarm
Auto-start of standby pump
Stand-by pump running indication
Cooler fail alarm
Fuse ratings correct
Refrigeration Breather
Check freeze/thaw cycle in accordance with Manufactures instructions
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Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
DC Operations
( or n/a)
Plant Terminal Block
Flag Relay
Surge trip
Gas alarm
Winding temperature indicator 1 trip
Winding temperature indicator 1 alarm
Winding temperature indicator 2 trip
Winding temperature indicator 2 alarm
Winding temperature indicator 3 trip
Winding temperature indicator 3 alarm
Breather device fail alarm
Oil Test
( or n/a)
Oil samples from top and bottom of tank, also tap change compartments. These shall be taken in an
approved manner to prevent oil being in contact with atmosphere.
Oil supplier
Oil samples tested
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11 of 12
Transformer (and Reactor) Test Form
Document Number: ECP 11-0213
Version: 3.0
Date: 30/01/2017
Comments
Test Equipment
Purpose
Make/Type
Serial Number
Certification
()
All tests have been completed satisfactorily
Contractor Commissioning Engineer (if applicable)
Organisation
Name
Date
Signature
UK Power Networks Commissioning Engineer
Name
© UK Power Networks 2017 All rights reserved
Signature
Date
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