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National Grid: Check List of Neutral Earthing Resistor (NER) Commissioning

This document is a checklist for commissioning a Neutral Earthing Resistor (NER) for a National Grid substation. The two-page checklist outlines 11 items to inspect and test, including visual checks, verifying nameplate data matches specifications, checking earth connections and resistances, insulation resistance testing, and cleaning before energization. Upon completing the checks, the checklist is to be signed by representatives from National Grid's Construction and Support Division, the contractor, and the Testing and Commissioning contractor.

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Santhosh Kumar Vinayagam
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249 views2 pages

National Grid: Check List of Neutral Earthing Resistor (NER) Commissioning

This document is a checklist for commissioning a Neutral Earthing Resistor (NER) for a National Grid substation. The two-page checklist outlines 11 items to inspect and test, including visual checks, verifying nameplate data matches specifications, checking earth connections and resistances, insulation resistance testing, and cleaning before energization. Upon completing the checks, the checklist is to be signed by representatives from National Grid's Construction and Support Division, the contractor, and the Testing and Commissioning contractor.

Uploaded by

Santhosh Kumar Vinayagam
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOC, PDF, TXT or read online on Scribd
You are on page 1/ 2

NATIONAL GRID

Title: Index Number:


CL-NG-6460-002-022
Check List of Neutral Earthing Resistor (NER) Commissioning Page Number:
1 of 2

1.0 Equipment General Data and Information

Substation NATIONAL GRID


Bay/Panel NATIONAL GRID
Equipment NATIONAL GRID Serial No NATIONAL GRID
2.0 Check List of NER Commissioning and Testing

Item Description Done Remarks

1. Visual inspection for any insulator broken.


2. Check nameplate and data.
Check the value of resistance and current ratings against
3.
the specifications.
Checks that the earthing with solderless connectors and
suitable for termination of copper conductor of size 240
mm2 for 40 kA and below.
4.
Check the grounding resistance of the enclosure earth
terminal and resistor earth terminal. Confirm the continuity
and tightness of the Bolt & Nut.

Check the resistor rated for 5 Seconds unless specified in


5.
data schedule.

6. Test associated NCT & power cable.


Main circuits Resistance measurement test at ambient
temperature. The resistor provided in the NER panel/box
7.
shall be measured (after disconnecting the leads) and it
should match with the name plate.
8. Insulation resistance measurement test at 5kV DC

Cleaning of all internal as well as external to NER before


9.
energization.

Check that the enclosure earth terminal and resistor earth


10. terminal are separate to allow the possibility of
disconnection during testing.

Archiving System Website: http://AMAS


NATIONAL GRID

Title: Index Number:


CL-NG-6460-002-018
Checklist for Commissioning of Oil-Immersed Power Transformer Page Number:
2 of 2

Check if heater circuit is provided, it cutoff automatically,


11. when Transformer is in service and cut in automatically,
when transformer is taken out of service.

CSD Contractor T&C Contractor


Name
Sign.

Archiving System Website: http://AMAS

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