Substation audit questionnaire

Substation internal audit should be done yearly basis. It is advisable to have a checklist and to be audited on regular interval. Good ambience will have better operational facility and long life of substation equipment.

1. Is authorized person list are updated? 

2. Is (SLD) single line diagram is updated? 

3. Is insulation mats are laid in front of and back to all panels? 

4. Is SOP standard operating procedure is updated? 

5. FLP light, EX fan, Detector and shower are installed in battery bank? 

6. Civil job of battery banks including eye shower, mirror, drain pipe, water availability, wash basis,             door lock, floor cleaning. 

 7. Is Substation door/ window/ventilator glasses broken &closing issue are rectified?

 8. Is there any false ceiling/flooring abnormalities? 

9. Is Substation lighting sufficient

10. Is Sprinkler system status updated? 

11. Any issue pertaining to Sprinkler/Deluge system bilingual SOP preparation and flex board printing         and installation- 

12. Is battery bank Do’s and Don’ts board provided ? 

13. Is DC lighting report available? 

14. Is Emergency handling scenario handbook available? 

15. Is TR yard free from vegetation, get locked. 

16. Is Scraps/spare materials dumped in substation and cable cellar removed? 

17. Is Substation roof leakage/water proofing job completed? 

18. Is Operator/shift in-charge log book signing checked regularly? 

19. is locking of Substation door /TR yard gate wherever missing? 

20. Is hazardous area classification displayed in manned location? 

21. Is ARC suit availability in manned locations checked? 

22. Is Splash suit in manned locations for battery bank job available? 

23. Is PPEs (HT/LT Hand gloves, Discharged rod, HT tester) available in manned location? 

 24. Is measuring tools calibrated? 

25. Is fire Extinguisher placement done at marked area ? 

26. Is status of Earth pit value and condition report available? 

27. Is flex boards of SLD, Shock treatment chart, Do’s & Don’ts, physical layout, Important Telephone         number displayed? 

28. Is any deviation in LOTO audit available?

29. Is Breaker lifting trolley testing report available? 

30. Is missing Sand/fire bucket, Sand filling done regularly? 

31. Is substation floor/TR yard cleaning done regularly? 

32. Is pressurization blower available, manometer provided? 

33. Is danger plates provided as voltage grade? 

34. Is danger Sticker on HT/LT panels in all substations provided?

Possible cause of electrical failure

Due to the gap or deviation during the electrical operation and maintenance electrical failure takes places and sometimes it becomes so fatal.

 a) Safety

1) Not using PPE

possible cause of electrical failure 

2) Poor lighting 

 3) In/exit path missing

 4) Using non-standard tools 

5) Not using LOTO

 6) Wrong tag marking 

7) In sufficient fire detector, fire extinguisher 8) Improper SOP for energization/de-energization 

  b) Monitoring issue 

 9) Irregularity in in taking reading 

 10) Relay failure

 11) Irregularity in PM

 12) Time coordination with up stream

 13) Setting coordination with up stream 

14) Numerous alarm 

15) Irregularity in in taking reading of UPS, Battery charger 

16) High temperature in VFD/UPS room 

  c) Marking on panel

17) Feeder cubical name 

 18) Rating 19) Fuse rating 

20) Cable size 

 21) Special marking 

  d) Functional 

22) non availability of emergency light for power restoration 

 23) Auto failure of bus coupler 

 24) Spare short fall 

 25) Non availability of testing equipment 

 26) ill weather 

27) poor maintenance

  e) Fire Hazard 

 28) flammable material in cable cellar 

 29) Non FLP equipment in battery room

 30) Improper spacing of fire extinguisher 

 31) Hydrocarbon ingress in substation 

 32) Failure of insulation

  f) Furious tripping 

 33) Wrong relay setting 

 34) Wrong operation 

 35) Wrong sequence of operation 

 36) Wrong control circuit 

 37) Breaker failure 

 38) Poor scheme 

 39) Poor design 

  g) Flashover 

 40) Failure of end termination 4

1) Lizard entry

 42) Unwanted light on at night 

 43) Aging of equipment 

 44) CT/PT failure 

 45) Water ingress in JB/DB 

 46) Rodent entry

 47) Moisture ingress

 48) Poor ventilation 

 49) Fire in capacitor of AC 

  h) Knowledge gap 

 50) Lack of training 

 51) Lack of knowledge 

 52) Improper monitoring