Operating 110kV / 220kV Substation

In order to maintain normal operation and prevent possible risks to the equipment, the operation team implements measures to check, clean, periodically maintain the equipment, periodically check equipment.

Check and monitor operating parameters and take measures to ensure that equipment operates according to the manufacturer's allowable rated parameters.

Carry out periodic visual inspection of equipment and, if necessary, use measuring instruments to accurately identify abnormalities of electrical equipment.

OPERATION OF EQUIPMENT AT SUPPLY STATION includes 2 main items that can be mentioned are:

1 – Primary equipment
2 – Secondary equipment
3 – Auxiliary equipment at the station

Primary equipment Monitor operating parameters according to regulations Test item Category of maintenance  Periodic test items
Transfomer
 Current, voltage, capacity, oil temperature, coil, oil level, tap...
  • Transformer overview (signs of oil spillage, rust, corrosion on metal parts, missing or loose bolts and nuts, no birds nesting on the machine...)
  • Grounding system (ground wire must be connected firmly and without signs of loose, broken ...)
    Cooling system (no abnormal noises, no stuck shafts, wings...)
    Internal protection relay system (oil temperature, coil temperature, pressure, steam, oil level...)
    Breathing system - dehumidifying (discoloration of desiccant, oil cup ...
  • OLTC control cabinet, MBA control cabinet (closed cabinet, not invaded by insects, small animals, not contaminated with moisture, dew, clamp rows, dryer, internal lighting in the cabinet are working properly... )
    Penetration porcelain (sufficient oil level, no oil leakage, porcelain surface has no signs of discharge, cracks, dirt, etc.

Perform scheduled cleaning and maintenance of equipment.

Unscheduled execution of unsatisfactory items in operation (need to cut off electricity, machinery, supplies, specialized equipment)

 
 

 Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).
TI
 Current
Voltage
 

Insulation (sufficient oil level, no oil leakage, porcelain surface without signs of discharge, cracks, dirt, etc.)

Grounding system (ground wire must be connected firmly and without signs of loose, broken ...)

   Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).
TU
 voltage

Penetration porcelain (sufficient oil level, no oil leakage, porcelain surface has no signs of discharge, cracks, dirt, etc.)

Grounding system (ground wire must be connected firmly and without signs of loose, broken ...)

   Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).
Circuit Breaker
 SF6 gas pressure, CB state, storage state..
  • Grounding system (ground wire must be connected firmly and without signs of loose, broken ...)
  • CB abnormal warning signal (low SF6 gas, energy source, circuit breaker power supply, ...).
  • Control cabinet (closed cabinet, free from insects and small animals, not contaminated with moisture, frost, clamp rows, dust-free contactor, firmly connected wiring, dryer, internal lights cabinet works normally....
   Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).
Disconnect switch (DS)
 Status of disconnect switch
  • DS closes/opens the full stroke;
    No nesting birds on the DS ;
    Grounding system (ground wire must be connected firmly and without signs of loose, broken, etc.);
  • Control cabinet (closed cabinet, free from insects and small animals, not contaminated with moisture, frost, clamp rows, dust-free contactor, firmly connected wiring, dryer, internal lights cabinet works normally...)
   Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).
Earthing switch
 Status of earthing switch
  • Earthing switch closes/opens the entire journey;
    Grounding system (ground wire must be connected firmly and without signs of loose, broken, etc.);
  • Control cabinet (closed cabinet, free from insects and small animals, not contaminated with moisture, frost, clamp rows, dust-free contactor, firmly connected wiring, dryer, internal lights cabinet works normally...)
   Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).
Lightning arrestor
 Lightning arrestor
     Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any)..

Secondary equipment Monitor operating parameters according to regulations Test item Category of maintenance Periodic test items
Protection relay system Current, voltage, power, leds, protection relay status...

There is no abnormal warning led signal at the relay.

RLBV installation cabinet is sealed, not invaded by insects, small animals, not contaminated with moisture, frost, clamps, dust-free contactor, firmly connected wiring, dryer, internal cabinet lighting works normally...)

 Perform scheduled cleaning and maintenance of equipment.
 Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).
Distribution computer system
 Current, voltage, capacity, oil temperature, coil, oil level, tap...

The alarm signals, the first device state must correspond to the first device state.

 Carry out cleaning and maintenance of equipment as planned
 Fully carry out the items of periodic testing of equipment according to national technical regulations on electrical engineering as well as items at the request of the manufacturer (if any).

BUSINESS FIELDS