NATIONAL GRID SA
Title: Work Instructions Index Number Revision Number: Page Number:
WI-NG-6460-002-077 01 1 of 4
Prepared By: Original Issue Date:
2015-07-01
Revision Date:
Tarek Mohammad Ahmad
Technical Support & Coordination Division 2023-08-29
Reviewed By:
Automatic Voltage Muhammad Al-Buhairi, Division Manager
Regulator (90) Technical Support & Coordination Division, CSD
Validated By:
Commissioning
Abdulaziz M. AlKulaib, Division Manager
Policies & Procedures Division, SM&BPED, NG BS Sector
Approved By:
Faleh F. Al-Qahtani, Department Manager
Commissioning Services Department, Asset Management
Sector- Transmission Engineering & Asset Management BL
1.0 INTRODUCTION
Proper testing and commissioning of new AVR Relay (90) is an important issue to
prove that AVR Relay (90) has been properly shipped and correctly erected and
installed. This work instruction highlights the necessary steps related to proper
commissioning of the AVR Relays (90) in HV and EHV substations.
All AVR Relays (90) must be tested in the factory before delivery to the site and must
be tested by a pre-qualified testing and commissioning contractor at the site after
installation for processing to begin the on-site testing and commissioning phase.
Commissioning tests at the site are done to prove that:
No AVR Relay (90) was subjected to any damage during transportation.
Each AVR Relay (90) has been installed correctly.
Each AVR Relay (90) is working in coordination with other equipment, as specified.
All installed AVR Relays (90) are safe for putting into service
2.0 RESPONSIBILITIES
- Anyone working in the testing location during the commissioning stage must follow
the safety instructions as per SEC rules and CSD employees are responsible for
applying safety rules in all places that they are working in.
- The PMD is responsible for committing the Main Contractor to prepare the testing
and commissioning places to be done in proper climate conditions as per Company
policies, procedures and accepted temperatures the relays, devices and test
equipment can be tested or operated within it.
Policies and Procedures Management System Website: http://ngridsa-apps/amas/ TP-NG-6250-001-007
NATIONAL GRID SA
Title: Work Instructions Index Number:
WI-NG-6460-002-077
Automatic Voltage Regulator (90) Revision Number: Page Number:
01 2 of 4
Commissioning
- CSD Employee is responsible for:
o Witnessing the activities according to the approved specifications and design.
o Checking and witnessing all activities required for AVR Relays (90) following all of
this work instruction.
o Signing the commissioning schemes of AVR Relays (90), checklists, and the test
formats once tests have been finished after checking all tests’ values compared
with AVR Relays (90) in the data schedule, and FAT results.
- The Testing & Commissioning Contractor Engineer is responsible for:
o Providing the following before starting the test:
o Test forms
o Approved schematic drawings (Pre-Check & Commissioning Copies)
o Test equipment valid calibration certificates and it is available in the
Prequalified Testing Equipment/Tools List DS-TS-6450-006-001
o Contractor engineer pre-qualification certificate
o Protection Requirement
o Relays Manual
o Technical Data Schedule
o Approved final settings.
o Approved schematic drawings.
o Performing the testing and commissioning of the AVR Relays (90) using an
approved test equipment in the presence of the CSD witness.
o Signing the commissioning schemes of AVR Relays (90) checklists, and the test
formats once tests have been finished after checking all test values compared with
AVR Relays (90) in the data schedule, nameplate, and FAT results
Policies and Procedures Management System Website: http://ngridsa-apps/amas/ TP-NG-6250-001-007
NATIONAL GRID SA
Title: Work Instructions Index Number:
WI-NG-6460-002-077
Automatic Voltage Regulator (90) Revision Number: Page Number:
01 3 of 4
Commissioning
3.0 WORK INSTRUCTION
3.1 General Mechanical Checks and Visual Inspection
Item Description Reference / Criteria Limit
1. General Visual Inspection WI-NG-6460-002-056
3.2 Electrical Tests
Item Description Reference / Criteria Limit
WI-NG-6460-002-057 &
1. General Electrical Tests
WI-NG-6460-002-058
2. Check the line drop compensation.
3. Test Regulating Value ∆U %.
4. Test Circulating current
5. Check of voltage levels
Check the effect of load shedding enable and the effect at
6.
various settings.
7. Check of linear time delay
8. Check of inverse time delay.
9. Measure Raise & Lower command time delay. limit 0.5 – 1.0 sec
Test over and under voltage blocking. - the time delay of the
blocking contact is 10 sec
10. - The time delay of the
over voltage. Signal
relay. less than 1 sec
Test over current blocking. the delay of the over
11. current contact less than
1 sec
Policies and Procedures Management System Website: http://ngridsa-apps/amas/ TP-NG-6250-001-007
NATIONAL GRID SA
Title: Work Instructions Index Number:
WI-NG-6460-002-077
Automatic Voltage Regulator (90) Revision Number: Page Number:
01 4 of 4
Commissioning
4.0 REFERENCES
Index/Reference
Title
Number
CL-NG-6460-002-077 Checklist for Automatic Voltage Regulator (90) Commissioning
DS-TS-6450-006-001 Prequalified Testing Equipment/Tools List
WI-NG-6460-002-056 Protection relays general mechanical checks & visual inspection
WI-NG-6460-002-057 Protection relays general electrical tests
Guidelines for testing digital & numerical protection & control
WI-NG-6460-002-058
relays and IEDs
5.0 REVISION HISTORY
Revision Date Description of Modifications/reason for Change
00 2015-07-01 First issue.
Reviewed/updated the document/processes as part of the
01 2023-08-29 actions taken to comply with the recommendation of the
process gap observations as a result of internal audit.
This document shall comply in accordance with the existing Company’s Rules and Regulations.
Any modifications/discrepancies therein found not conformance shall be declared invalid.
For clarification and verification on this document, contact the following:
Engr. Tarek Mohammad Ahmad
Technical Support and Coordination Division
Commissioning Services Department
Asset Management Sector-
Transmission Engineering & Asset Management BL
Extension No. 77469 Email: 69608@ngrid.sa
Policies and Procedures Management System Website: http://ngridsa-apps/amas/ TP-NG-6250-001-007
NATIONAL GRID SA
Title: Checklist Index Number:
CL-NG-6460-002-077
Checklist for Automatic Voltage Regulation (90) Commissioning Revision Number: Page Number:
01 1 of 1
1.0 Equipment General Data and Information
Substation
Bay/Panel
Equipment Serial No
2.0 General Mechanical checks and visual inspection
Item Description Done Remarks
General Visual Inspection. (marked check list CL-NG-6460-002-
1.
055 should be attached )
3.0 Electrical Tests
Item Description Done Remarks
General Electrical Tests. (Marked check lists CL-NG-6460-002-
1.
055 And CL-NG-6460-002-055 should be attached )
2. Check the line drop compensation.
3. Test Regulating Value ∆U %.
4. Test Circulating current
5. Check of voltage levels
Check the effect of load shedding enable and the effect at various
6. settings.
7. Check of linear time delay
8. Check of inverse time delay.
9. Measure Raise & Lower command time delay.
10. Test over and under voltage blocking.
11. Test over current blocking.
CSD T&C Contractor Item Number
Name
Sign.
Date
Name
Sign.
Date
