SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 1 of 17
Dwg. Ref.:
Record No.:
GENERAL DATA AND INFORMATION:
Designation :
Rated Current:
Make:
Rated voltage:
Type:
Aux.voltage for close
Media of arc extinguising
Aux.voltage for close
Rated short time making current
Rated short time withstand current :
Frequency:
Year
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
NATIONAL GRID
Index Number:
Title:
CL-NG-6460-002-027
Check List of Hybrid/Gas Insulated Switchgear (GIS) Commissioning
Page Number:
1 of 4
1.0 Equipment General Data and Information
Substation
Bay/Panel
Equipment
Serial No
2.0 Mechanical Check and Visual Inspection
Item
1.
Description
Inspect for physical damage or defects.
Check name plates and information with drawings and
2.
specifications as specified in Data Schedule.
Inspect enclosures for proper alignment and foundation fixing
3.
and grounding.
4. Check quality of paintwork.
Ensure that all special tools and equipment are provided as
5.
specified and have proper storage.
Check that all “ON” and “OFF” indications and SF6 gas
6.
pressure gauges are installed in visible locations.
Check the maximum allowed induced voltage in GIS enclosure
7.
of 65 V.
Check all piping of SF6 gas, hydraulic and pneumatic operating
8. mechanism including their fitting is made of copper, brass or
stainless steel.
9. Ensure that all CTs are ring core type.
Check all CT secondary circuit wiring within control cabinet is
2.5 mm2 and CT secondary circuits wiring External to control
10. cabinet is not smaller than 4 mm2.
Check facility of shorting, isolating and grounding of secondary
terminals inside terminal box.
Check all VT secondary circuits wiring is not less than 2.5 mm 2.
11. Check all VT circuits are provided with sliding link type terminal
blocks.
12. Check all wiring is heat 90 C°, and rated 600/1000V,
Check all control and instruments cables are properly shielded
13.
and the cable shield is grounded.
14. Check color coding of control cabinet wiring.
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Remarks
NATIONAL GRID
Index Number:
Title:
CL-NG-6460-002-027
Check List of Hybrid/Gas Insulated Switchgear (GIS) Commissioning
Page Number:
2 of 4
15.
16.
17.
18.
19.
20.
21.
Check AC circuit terminals and DC circuit terminals are fitted
with non-inflammable; transparent plastic covers to prevent
accidental contact with live parts.
Ensure that the manual operation of disconnect and grounding
switches is only possible under electrical interlocking release
conditions.
Ensure that the Electrical interlock schemes are fail-safe to
prevent loss of interlock function upon loss of control voltage.
Check the availability of Mechanical interlocking between
disconnect and grounding switch operation.
Check that at least 10% spare contacts (NO & NC) provided
with each auxiliary relay.
Check that at least 10% spare windows from
alarms/annunciators in control cabinet.
Check color of mimic bus is as specifications.
22. Check on line partial discharge monitoring sensors.
Ensure that gas-handling cart (if provided) operates correctly
23. and that special filling and degassing fittings are provided and
have proper storage.
Verify that all lifting devices are correctly labeled for lifting
24.
capability.
Ensure that adequate ladders and walkways are provided for
25.
access to meters, filling ports, cranes, lights, etc
Check that all specified grounding switches are insulated, with
26.
removable grounding links.
Check tightness of all bolted connections (torque wrench
27.
method).
28. Check each gas section filled to correct rated pressure.
Check SF6 gas at each gas section for air and moisture
29.
content after filling at rated pressure.
30. Gas leaks test of all flanges and joints after erection and filling.
Calibrate gas pressure (density) gauges. Check the gauges
31.
have correct, legible and readable scales.
32. Check the gauges have definite mark scale.
33. Check the gauges are ambient Temperature compensated.
Check operation of all gas density switches (alarm trip signals
34.
and lockout functions). Confirm correct set points.
Check all wiring is colored according to approved drawings and
35.
specifications.
36. Verify that all front panel mounted devices (meters, push
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NATIONAL GRID
Index Number:
Title:
CL-NG-6460-002-027
Check List of Hybrid/Gas Insulated Switchgear (GIS) Commissioning
Page Number:
3 of 4
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
buttons, switches, indicator lamps, mimic buses, etc.) are
installed as per drawings, fixed permanently and are correctly
labeled.
Verify that all operating devices are correctly labeled.
Check that all phase marking and circuit labeling have been
installed as per specifications.
Ensure that all disconnects switches are provided with viewing
windows or mechanical indicators for verification of contact
positions and that all grounding switch positions can be visually
verified from ground level.
Verify that correct Dispatch Numbers have been installed.
Check the closed barriers at the ends of each gas zones are
externally colored yellow or orange. The zone gas density
gauges shall have zone marking plates fixed over the gauges.
Check & confirm GIS VT’s primary isolation device with manual
operation provided, along with it monitoring system locally as
well as on mimic diagram in control room.
Check & confirm the three-phase test adaptor and bushing for
HV test on GIS have been provided.
Check & confirm there are no any sharp edges for the cable
trays or other metallic parts.
Check GIS over pressure relief discs are not cracked or
deformed.
Check the labeling and phasing of cable insertion.
3.0 Electrical Test
Item
Description
1. Insulation resistance test for all wiring.
Check scheme for control cabinet schematic drawing and
2. Function of control and interlocking for all equipment and
devices.
Contact resistance test as per factory conditions. (Ambient
3. temperature shall be recorded; winding resistance shall be
referred to 20°C).
CBs, DSs and ESs Timing Test (Open & Close) with contact
4.
travel and speed analysis.
5. Functional test of trip free and anti-pump circuits
Disconnect Switch Close and open time tests for the
6. confirmation of early make and late break operation of
auxiliary contacts with main contacts for CT switching
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Remarks
NATIONAL GRID
Index Number:
Title:
CL-NG-6460-002-027
Check List of Hybrid/Gas Insulated Switchgear (GIS) Commissioning
Page Number:
4 of 4
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
schemes.
Check Minimum control voltage trip (60%) and close (80%)
operations.
Check pump start stop trip/close lockout threshold values for
CB mechanism.
GIS PTs to be included during AC HV tests on GIS when test
frequency is well above rated Frequency, otherwise test at
1.5Un – one minute at rated frequency without secondary
load. PTs secondary output volts shall be measured
accordingly during the high voltage test.
Testing of All AC/DC MCBs tested by trip test through current
injection.
Testing of all auxiliary relays and contactors.
Testing of meters, annunciators and metrosil resistors.
Measure current drawn by motor for CB and DS and check
the results according to design.
Check & confirm the three-phase test adaptor and bushing for
HV test on GIS have been provided.
Verify the alarms being initiated by SF6 density gauges on
LCC and up to control room during calibration process.
Check that all cubicle space heaters and thermostats are
functional and at correct temperature control settings.
Perform Mechanical Check and Visual Inspection and
Electrical test as per WI-NG-6460-002-023 for current
transformers
Perform Mechanical Check and Visual Inspection and
Electrical test as per WI-NG-6460-002-024 for voltage
transformers:Check gaps of protective flashover devices (if applicable).
Verify secondary circuits, terminal to terminal for correctness
and tightness before energization.
High voltage test as per WI-NG-6460-002-028
CSD
Name
Sign.
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Contractor
T&C Contractor
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Dwg. Ref.:
Page 6 of 17
Record No.:
A. ELECTRICAL TESTS:
1. INSULATION RESISTANCE TEST FOR CONTROL CIRCUIT:
Instrument
:
Make
:
Model No. / Sl. No.
:
Voltage applied
:
500 V DC
Applied Points
:
(i) Between terminal block (with all terminals
Shorted) and ground
(ii)
Between
Auxiliary Control circuits
connected together as a
whole and frame of the switchgear.
Criteria
:
Equipment
> 5 M Ohms.
Measured Value
Remarks
A.1. Bus Continuity & Phasing Test
Testing Instrument
:
Procedure : The bus continuity and the phase of the buses are checked at all the CB feeders.
Result
:
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 7 of 17
Dwg. Ref.:
Record No.:
2. Functional test of control &Interlocks :
3. Resistance of Ground connection:
[
4.Resistance of Bus Joints :
Testing Instrument
Make
:
Sl. No.
:
Range
:
Calibration Certificate
:
Current to be applied
:
Connections
Switchgear
Cubicle
:
100A DC
: Both current & voltage leads are
connected across a Bus tapping point
and outgoing cable termination points.
Resistance in milli Ohms
Phase A
Phase B
Phase C
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
Remarks
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 8 of 17
Dwg. Ref.:
Record No.:
Wiring Correctness
Testing Instrument
Continuity Tester
:
1 No.
Procedure
All external wiring is checked for compliance to the termination schedules
All Panels wiring correctness will be checked by continuity method as
Per approved drawing.
5. OVERALL RESISTANCE OF THE MAIN CIRCUIT:
Sl.No.
Description
1.
Overall R resistance of
the main
circuit.
Criteria
Not more than 1.2 x R design with
components (CBs, disconnects, etc.)
in closed position. Applying DC
current of 100 A As per SEC
Commissioning Manual Section A
Page 64 of 116.
Result
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 9 of 17
Dwg. Ref.:
Record No.:
6. Resistance of Circuit Breaker - Main Contacts
Panel Designation
:
Breaker Reference
:
Instrument
:
Make
:
Model No. / Sl. No.
:
Calibration Certificate
:
Applied Current
:
100 A DC
Circuit Breaker Status
:
Closed Position
Instrument Connection
:
i)
Phase
Measured Value in
Ohm
Current leads & voltage leads connected to
terminals of CB
ii) Repeat for each phase.
MicroCriteria
Micro-Ohm
REMARKS
A
B
C
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Dwg. Ref.:
Page 10 of 17
Record No.:
Resistance of Earth Switch – Main Contacts
Panel Reference
Earth Switch Designation
Instrument
Make :
:
:
:
Model No. / Sl. No.
:
Calibration Certificate
:
Applied Current
:
100 A DC
Earth Switch Status
:
Closed Position
Instrument Connection
:
i)
Phase
Current leads & voltage leads connected to terminals of
Earth Switch.
ii) Repeat for each phase.
Measured Value in Micro-Ohm
Criteria
Micro-Ohm
Remarks
A
B
C
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 11 of 17
Dwg. Ref.:
Record No.:
7. FUNCTIONAL CHECK:
5.
Sl.No.
Description
Criteria
Result
1.
Functional Check of all alarms,
interlocking and indication
circuits from the switchgear
through to the local control
cubicle.
As per Approved drawing for
alarms, interlocks and indication
circuits for GIS.
Check and Confirm for the three phase test adaptor
and bushing for HV test on GIS has been provided.
8. CB’s Timing Test (Open & Close) with contact TIMING TEST
travel ,speed analysis and all related test of C.B
9. Space Heater and Thermostat
Sl.No.
Description
1.
Supply Voltage
2.
Thermostat Operation
Criteria
220 V AC
55 ± 5 º F
70 ± 5 º F
Heater Circuit ON
Heater Circuit OFF
3.
Remarks
Heater Current ( A )
( Single Phase )
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
440008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 12 of 17
Dwg. Ref.:
Record No.:
10. C. SF6 GAS TEST
C.1. Gas Leakage Test
Instrument
:
Gas leakage detector
Make
:
Model / Sl. No.
SF6 Gas Pressure
Gas Leakage
if any
Temperature
C.2. Moisture Content Test
Instrument
Make
Model / Sl. No.
Indication of SF6
Gas Pressure
:
:
:
Dew Point
OC
Air and Moisture
cont PPM
Criteria By
Vol PPM
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
Result
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 13 of 17
Dwg. Ref.:
Record No.:
C.3.Gas Density Monitor Check & Calibration
Instrument
Model / Sl. No.
Criteria
:
Normal operating pressure
GIS Compartment name
Density monitor Ref
:
SF6 Gas Pressure
Switch
Make
:
:
Calibration
:
: Refer attached 'Density Monitor Calibration Curves'
600 kPa
:
:
Set
Pressure at
ºC
Temp.
during Test
ºC
Pressure
Gauge
mounted on
GCB
PSIG
Master
Gauge Reading
(Std.Gauge)
PSIG
LOW Pressure
Alarm & Block
Breaker Close
Min. operating
Pressure
( Block Trip /
Close )
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
Alarm Check
at Control
Room
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Dwg. Ref.:
Page 14 of 17
Record No.:
11. HV on Gas insulated switchgear (GIS)
Preparation for HV test
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
The GIS shall be installed completely and gas-filled at its rated filling density.
the HV may be produced by:
- test sets with a test transformer,
- test sets with a variable resonant reactor for constant frequency,
- test sets with constant resonant reactor for variable frequency,
- Energizing power or voltage transformers from the low-voltage side which entails no dismantling after testing.
Some parts may be disconnected for the test, either because of their high charging current or because of their effect on
voltage limitation, such as
- High voltage cables and overhead lines;
- Power transformers and, occasionally, voltage transformer;
- Surge arresters and protective spark gaps.
Every newly installed part of a GIS shall be subjected to HV test on site.
In the case of extensions, in general, the adjacent existing part of the GIS should be de-energized and earthed during the
HV test.
Application of the test voltage may be necessary after repair or maintenance of major parts or after installation of
extensions. The test voltage may then have to be applied to existing parts in order to test all section involved. In those
cases, the same procedure should be followed as for newly installed GIS.
The HV test shall be distinguished by their progressive voltage increase, performed in order to achieve some form of
electrical conditioning of the equipment before commissioning.
The term electrical conditioning means a progressive application of an AC voltage either by steps or continuously
according to the manufacturer’s recommended test procedure. It may be performed by the manufacturer as part of the
gas-filling process on site in order to move possible particles towards areas with low field strength, where they become
harmless.
Electrical conditioning is not requirement and does not replace the AC voltage test, unless the test voltage is increased up
to the specified value. Nevertheless, a disruptive discharge should be reported to the user as it may result in weakening of
the insulation.
The HV voltage tests are especially sensitive in detecting contaminations (e.g. free moving conducting particles), and are,
in most cases, also sufficient in detecting abnormal field configurations.
it is often convenient to divide the whole installation of GIS into sections by opening circuit breakers and/or
disconnectors for at least one of the following reasons:
- To limit the capacitive load on the test voltage source.
- To facilitate the location of disruptive discharges.
- To limit the discharged energy if a disruptive discharge occurs.
For 3-phase enclosed GIS, the specified test voltage shall be applied between each phase conductor, one at time, and the
enclosure, the other phase conductors being connected to the earthed enclosure. The insulation between phase conductors
shall not be subjected to any other separate HV test on site.
All CT's secondary winding should be short circuited during the test.
Before the HV test the contractor should measure the PD level and record it and; at the end of the test; subtract this value
from the result
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Mazroeyah 115/13.8KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Dwg. Ref.:
Page 15 of 17
Record No.:
Test procedure
The capacitance current (mA) should be measured at all voltage steps and compared with the estimated value
Estimated value of capacitance current = V 2 π f C
V: the test voltage (V).
F: the frequency of the applied voltage (Hz).
C: the capacitance of GIS (get from the manufacturer) (F).
Procedure A (recommended for 170kV and below)
- electrical conditioning (depend upon the manufacturer)
For example 110kV SIEMENS GIS as follows:
1.2 U / √3 for 15 min. then U for 3 min. then the HV for 1 min. ( U is the rated line voltage)
- HV test for a duration of 1 min. at the value specified in the table no. ( 1 )
Procedure B (recommended for 245kV and above)
- Electrical conditioning (depend upon the manufacturer).
- HV test for a duration of 1 min. at the value specified in the table no. ( 1 )
- Partial discharge measurements according to table no. (2) When decreasing the HV.
Procedure C (recommended for 245kV and above, alternative to procedure B):
- Electrical conditioning (depend upon the manufacturer).
- HV test for a duration of 1 min. at the value specified in the table no. ( 1 )
- Lightning impulse tests with three impulses of each polarity and with the value specified in table
no. (1).
Partial discharge measurement
Partial discharge measurements may be helpful in detecting certain kinds of faults during site tests and determining the need for
maintenance of the equipment after a period in service.
Assessment of the test
-
The switchgear shall be considered to have passed the test if each section has withstood the specified test voltage without
any disruptive discharge.
The partial discharge measurements within the limits (10 pC).
In the event of disruptive discharge occurring during dielectric tests on site, the test shall be repeated.
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
NG-SA Contract No. :
4400008903
GAS INSULATED SWITCHGEAR (GIS)
Panel/ Bay No:
Equip. No.:
Page 16 of 17
Dwg. Ref.:
Record No.:
Repetition tests
The procedure to be implemented following a disruptive discharge during dielectric tests on site may depend on several factors
which include:
- The type of disruptive discharge (breakdown in self-restoring or non-self-restoring insulation).
- Magnitude of the arc energy dissipated during the discharge.
- Shape and material of the solid insulation.
Consideration of these and any other relevant factors should allow a procedure to be established and agreed between the
manufacturer and SEC. A recommended procedure is given below but should be treated only as a guide. Variations may be
acceptable, depending on the significance of the factors involved.
Recommended procedure for repetition tests
Procedure A:
If the disruptive discharge occurs along the surface of solid insulation it is recommended that wherever practicable the
compartment should be opened and the insulation carefully inspected for impairments. After taking any necessary remedial action,
the compartment should then be subjected to the specific dielectric test once more.
Procedure B:
A disruptive discharge in the gas may be due to contamination or a surface imperfection which may be burned away during the
discharge. It may be acceptable, therefore, that the test may be repeated at the specified test voltage. Another test voltage may be
agreed between manufacturer and user before the site tests have been started.
If the repetition test fails, again procedure A should be followed.
Table No. (1): On site test voltage (IEC 62271-203 @ 2003-11)
No.
Rated voltage for
GIS (Ur ) kV
On-site short duration power frequency
withstand test ( Uds) 1 min kV
1
2
3
4
5
6
7
8
9
10
72.5 (66 )
100
123 ( 110 )
145 ( 132 )
170
245 ( 220 )
300
362
420 ( 380 )
550 ( 500 )
120
165
200
235
270
380
380
425
515
560
On-site lightning impulse
withstand voltage ( Ups)
kV
260
360
440
520
600
840
840
940
1140
1240
Table No. (2): On site partial discharge measurement (IEC 62271-203 @ 2003-11)
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
:
SITE TEST REPORT
Date :
Contractor’s name:
Customer:
NG-SA
Name of substation: Al-Tawdihiyah 132/33KV Substation
GAS INSULATED SWITCHGEAR (GIS)
NG-SA Contract No. :
440008903
Page 17 of 17
Panel/ Bay No:
Equip. No.:
Rated voltage
for GIS (Ur )
kV
1
2
3
4
123 ( 110 )
145 ( 132 )
245 ( 220 )
420 ( 380 )

Dwg. Ref.:
System with solidly earthed neutral
Pre-stress voltage
Test voltage for
( 1 min) kV
PD measurement
(HV test )
( > 1 min) kV
1.2 Ur / √3
200
85.21
235
100.45
380
169.74
515
290.9
Record No.:
System without solidly earthed neutral
Pre-stress voltage Test voltage for PD
( 1 min) kV
measurement
(HV test)
( > 1 min) kV
1.2 Ur
200
147.6
235
174
380
294
515
504
Maximum permissible value for partial discharge is 10 pC
The procedures that should be done after the HV test finished successfully:



Put all voltage transformers in service.
Apply the rated voltage to the GIS.
Measure all voltage transformers secondary winding voltage in the Local control panels in GIS switchgear.
Test sheet may be as follows:
Test
voltage
kV
Test
time
Hz
Min.
Capacitance current (mA)
Phase
A
Phase B
Phase C
Partial discharge measurement
(pC)
Phase
Phase B Phase C
A
remarks
Electrical
conditioning*
Test voltage
Electrical
conditioning*
Partial discharge
voltage
*Electrical conditioning steps depend upon the manufacturer.
High voltage test at 10 kV AC for 1 minute on all grounding-switches external insulating bushings.
DATE:
TESTING ENGINEER
CSD- Engineer
Signature:
Signature:
Name
Name
:
: