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After De Energizing the system, Need to perform Mechanical and Electrical Inspection over the system
1.Cleaning , applying grease, labeling (if required) , visual inspecting of door operation, physical damages
2.Tightness of BUSBAR, Cable joint, mechanical operation of Earthswitch, Circuit Breaker,
3.Electrical maintenance test performed on electrical equipment (CT,VT, Circuit Breaker, Dis-connector, measuring units, protective relays, Earthing system)
Please give me 33/11 KV substation XLPE Cable maintenance schudle?
The general maintenance works include :
Preventive Maintenance of entire 33/11 kV substation and switchyard. The intention is to keep the system in a trouble free operational condition and continuous power supply to the out going feeders :
1. The readings of the current, voltage, and other related parameters through various meters etc. shall be checked and recorded in the log book/register.. Necessary action is to be taken if the readings are not normal.
2. Maintenance of Lighting systems.
3. Inspection and rectification of terminations - Check the lugs/thimbles/terminals points of the electrical panels, switches, starters, indication lights, contactors, switchgear etc. and replacement whenever required.
4. Inspection and monitoring of the UPS and thebattery charger and battery bank and other controls.
5. Upkeep of all the electrical equipments and keeping them in neat and clean condition.
6. Cleaning of the interiors of the switchgears panels by vacuum/air blower /wiping them to make neat and dry condition during Shutdown.
7. Checking the contacts of various contactors, cleaning/rubbing and changing of the contacts
8. Checking the inter-locking of the various equipment and trip circuits.
9. Maintenance of Earthing system : Watering the earth pits for proper earth resistance and checking the joints and continuity of earth conductors visually and also measuring the earth resistance of each earth pits and to ensure that they are in the tolerance range.
10. Maintenance of switchgear - VCBs/ACBs as required. Checking of all the Circuit Breakers connected with the switchgear panels and their operating mechanism/contacts etc. and make them in perfect condition
11. Maintenance of all the electrical equipments including Relays, Transformers, capacitor banks, motors etc. as per requirement of the OEM/OEM’s manuals.
12. Maintenance of cable trenches and cable ducts etc. concerned with the power, control and communication cabling of the systems.
13. Maintenance of switchyard will include cleaning of all outdoor equipment like CT, PT, isolators, post insulators etc. and checking of all conductor connections and tightening the same if required. The switchyard to be maintained clean and grass and other plants will be removed at regular interval.
14. Monitoring and maintenance of Transformers including checking of oil level in conservator & if required top up of makeup oil, Regular inspection for any leakage, checking of thermometer & recording of temperature, cleaning of Breather assembly & removal of moisture by heating of silica Gel if so required, regular inspection & checking of explosion vent, regular checking of the insulation resistance of the HT & LT windings, Checking of Dielectric Strength & DGA of the oil once in a year from the approved laboratory.
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