Ac Panel Test Prosedure

Contractor
Owner
Main Subcontractor
PROJECT NAME: Khabat Thermal Power Plant Units 1&2

OWNER: Ministry of Electricity of Kurdistan Regional Goverment
CONTRACTOR: POSCO Engineering & Construction Co. Ltd.
MAIN SUBCONTRACTOR: GAMA Power Systems Engineering &
Contracting Inc.
PROJE REFERENCE NO:
Rev
Revision
Date
Description
15.09.2015
For Review
Revision History
Created by
Checked by
A.E. AKMAN
Emission Status
Return
Status
B. GKCE
Vendor doc No.:
Vendor Logo
Approved by
Document Code :
Title, Subtitle
AC PANEL
TEST PROCEDURE
Format
A4
Rev. 0
Date
15.09.2015
Lang.
En
Date
15.09.2015
Project No.
Project: Khabat Thermal Power Plant Units 1&2
ISSUE DATE
15/09/2015
ENG. N
AC PANEL
TEST PROCEDURE
CLIENT N
REV.
SH/OF
2/6
0
SUMMARY
1.
PURPOSE OF TESTS..............................................................................................................3
2.
REFERENCE DOCUMENT...................................................................................................3
3.
SCOPE.......................................................................................................................................3
4.
TERMINOLOGY.....................................................................................................................3
5.
TEST EQUIPMENT REQUIRED..........................................................................................3
6.
EQUIPMENT UNDER TEST.................................................................................................3
7.
PRELIMINARY CHECKS.....................................................................................................4
8.
ELECTRICAL CHECKS........................................................................................................4
8.1. TESTING CONTINUITY BETWEEN ALL METAL PARTS AND GROUND................4
8.2. DISTRIBUTION BOARD INSULATION RESISTANCE TESTS.....................................4
8.3. AC DISTRIBUTION CIRCUIT BREAKER TEST AND INSPECTION..........................5
8.3.1. Conformity Checks...............................................................................................................5
8.3.2. Mechanical Tests...................................................................................................................5
8.3.3. Electrical Testing of Circuit Breakers.................................................................................5
8.4. ELECTRICAL TESTING OF DISTRIBUTION BOARD...................................................5
8.4.1. Measurement and Protection Circuits Tests.......................................................................5
8.4.1.1.
Indicators...........................................................................................................................5
8.4.1.2.
Under/Overvoltage Protection.........................................................................................5
8.4.2. Energizing..............................................................................................................................6
8.4.3. Automatic Transfer Switches...............................................................................................6
9.
PLACING INTO SERVICE....................................................................................................6
10. RECORDING OF INSPECTION AND TEST DATA...........................................................6
Project No.
ISSUE DATE
15/09/2015
ENG. N
AC PANEL
TEST PROCEDURE
CLIENT N
REV.
SH/OF
3/6
0
1. PURPOSE OF TESTS
These tests cover all inspection and testing to be performed on the main AC distribution board after
Installation and prior to energization
This procedure provides a safe, standardized approach for initial inspection, checkout, pre-commissioning
testing and data documentation of 400 V Low Voltage (LV) Switchgear. The use of different testing
equipment may result in performing slightly different steps.
2. REFERENCE DOCUMENT
Single line diagram n
Schematic diagram / Equipement drawings N:
3. SCOPE
All working sites
4. TERMINOLOGY
No applicable.
5. TEST EQUIPMENT REQUIRED
Digital multimeter
Milliohmmeter for continuity measurement
Megohmmeter (1000Vdc)
AC test set power supply / variable transformer for injection
Phase sequence tester
6. EQUIPMENT UNDER TEST
All concerned distribution boards to which are applied a rated AC voltage less than 1kV.
Project No.
ISSUE DATE
15/09/2015
ENG. N
AC PANEL
TEST PROCEDURE
CLIENT N
REV.
SH/OF
4/6
0
7. PRELIMINARY CHECKS
-
Check that all the distribution board constituent parts are fitted and conform to the applicable
drawings (type, ground fault sensor, ratings, voltage monitoring relays, voltmeters, ammeters,
circuit breakers, etc...).
Check the marking of the distribution board components.
Check that it is not possible to come into contact with energized equipment when working on
the system.
Check the main busbar and auxiliary circuits (control, monitoring, alarm, fault) for continuity.
Check the grounding busbar continuity and connection to the main earthing system.
Check that the panel hinged doors are connected to the frame by earthing braids.
Check the door locks for correct operation.
Check the connections for conformity with the reference drawings and their tightness.
Open all the incomers and load circuit breakers.
Check the connections for conformity with the reference drawings and their tightness.
8. ELECTRICAL CHECKS
8.1.
TESTING CONTINUITY BETWEEN ALL METAL PARTS AND GROUND
For performing this test, it is generally recommended to use a milliohmmeter for continuity measurement.
8.2.
DISTRIBUTION BOARD INSULATION RESISTANCE TESTS
It is recommended to perform these tests before connection starting so all isolating devices will be closed.
If cables are already connected, open the isolating devices before any test. Downstream circuit will be
done with power cables tests.
Disconnect the ground sensing device and the control cables.
Using a 1000 V DC megohmmeter, measure the insulation resistance after a one minute electrification
time between :
Each phase and the 2 others ones + Neutral with ground.
Neutral and 3 phases with ground.
Using a 500 V DC megohmmeter, measure the insulation resistance after a one minute electrification time
between:
Auxiliary circuit and ground.
Reconnect the cables after testing.
8.3.
AC DISTRIBUTION CIRCUIT BREAKER TEST AND INSPECTION

8.3.1. Conformity Checks
Project No.
ISSUE DATE
15/09/2015
ENG. N
AC PANEL
TEST PROCEDURE
CLIENT N
REV.
SH/OF
5/6
0
Check the circuit breakers for presence and conformity with the reference drawings (type, magnetic
rating, thermal rating and label)
8.3.2. Mechanical Tests
Check for correct racking in for withdrawal circuit breaker and check :
That it is impossible to rack in a circuit breaker in the closed

position.
That it is impossible to close a circuit breaker not correctly racked

in.
That it is impossible to rack out a circuit breaker in the closed

position.
Check closing and opening / tripping operation at no load by:
Manual actuation
Pressing the test pushbutton if any

8.3.3. Electrical Testing of Circuit Breakers
Magnetic protection provides circuit breaker tripping on short-circuits.
The tripping value shall be adjusted but not checked by applying power.
Thermal protection provides circuit breaker tripping on overloads.
The tripping value shall be adjusted but not checked by applying power.
Check at the terminal blocks of the panel that the circuit breaker position, if any, and alarm conditions are
correct.
8.4.
ELECTRICAL TESTING OF DISTRIBUTION BOARD

8.4.1. Measurement and Protection Circuits Tests
8.4.1.1.
Indicators
Using a test set power supply, check the values read on the indicators.
If any associated converters check the indications to the corresponding output terminal block.
8.4.1.2.
Under/Overvoltage Protection
Using a test set power supply, check the relay operation and adjust to the desired rating.
The protection information reports shall be checked up to the distribution board output terminal block.
8.4.2. Energizing
Connect the incoming cables from Auxiliary transformer or from Main Distribution board.
Project No.
ISSUE DATE
15/09/2015
ENG. N
AC PANEL
TEST PROCEDURE
CLIENT N
SH/OF
6/6
REV.
Check the presence of the mechanical protectors preventing any accidental contact with live parts.
Open all the outgoing disconnecting devices.
Supply the distribution board via the incomer and check for voltage and correct phasing upstream of all
disconnecting devices, indicators and protection.
Check the distribution board alarm information return up to the output terminal blocks.
8.4.3. Automatic Transfer Switches
Check mechanical and / or electrical interlocks.
Check correct phasing.
With the both available supplies confirm the functional checks by presence of voltage, loss of supply,
restoration of supply in manual and in automatic mode.
9. PLACING INTO SERVICE
The both incoming supplies are readiness in the LVAC distribution board.
Check that all necessary protective and signaling devices are in services.
Voltage measurement, phase sequence check and voltmeter reading to be done for each busbar.
Close all outgoing circuit-breaker when necessary after checking of the corresponding low voltage power
cables and their phasing.
10. RECORDING OF INSPECTION AND TEST DATA
THE RESULTS OF THE CHECKS AND MEASUREMENTS MADE DURING THE FIELD TEST
SHALL BE RECORDED ON THE FOLLOWING TEST SEE ATTACHMENT TEST REPORT

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Contractor

PROJECT NAME: Khabat Thermal Power Plant Units 1&2

Vendor doc No.:

Project: Khabat Thermal Power Plant Units 1&2

Project: Khabat Thermal Power Plant Units 1&2

Project: Khabat Thermal Power Plant Units 1&2

DISTRIBUTION BOARD INSULATION RESISTANCE TESTS

AC DISTRIBUTION CIRCUIT BREAKER TEST AND INSPECTION

Project: Khabat Thermal Power Plant Units 1&2

That it is impossible to rack in a circuit breaker in the closed

That it is impossible to close a circuit breaker not correctly racked

That it is impossible to rack out a circuit breaker in the closed

Pressing the test pushbutton if any

ELECTRICAL TESTING OF DISTRIBUTION BOARD

Project: Khabat Thermal Power Plant Units 1&2

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