Page 28 - Practical Power System and Protective Relays Commissioning

24 Practical Power System and Protective Relays Commissioning

5. Producing the switching program and coordinate with national control
center (NCC) local/state/federal electrical supply company (also called
the National Control Center, NCC) during energization.
6. Producing the commissioning file which includes all method statements,
single line diagram, site instructions, deviation list and base design com-
ments, various tests, switching program, relay setting calculations, equip-
ments data sheet and specifications, relay manual, relay testing software,
and any other required items.
7. Attend commissioning panel meetings on site with other project
members.
8. Produce a contingency plan for an emergency should the required circuits
be switched off and the situation requires restoration of the operation of
one or more circuit during commissioning of existing circuits modification.
The responsibilities of the commissioning engineers and technicians
are:
1. Confirm all equipment is installed in the correct manner.
2. Confirm all equipment and test tools are on site to start activities as
per commissioning program (all with valid calibration certificate for
at least one year).
3. Insulation resistance and wiring check for all equipment and panels
at site.
4. Safe working environment at site.
5. Confirm that the approved relay setting and approved schematic
drawings are at site (last revision).
6. Follow commissioning program steps.
7. Ensure there is a reliable power source without fluctuation at site to
perform the testing in reliable manner; the use of nonstable equipment
leads to errors in test results.
8. Factory test results, approved test procedures and test sheets should
be checked by the commissioning engineer on site.
9. The base and detailed design comments should be checked by the
commissioning engineer on site.
10. Produce a punch list (also known as a snags list) that includes the
items not completed in any equipment test in the electrical system.
11. Produce a marked up drawing on site.
12. Produce the final commissioning test report.

3.2 POWER TRANSFORMER COMMISSIONING

3.2.1 Visual Check
A visual check of all equipment must be undertaken. These checks should
including checking of tightness of all bolts by torque wrench tool, nameplate
information, all pipe connections, earthing points, tap changers, and fans.