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

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 energisation/de-energisation 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 41) 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