Which gas is used in gas insulated substation?

Which gas is used in gas insulated substation?

sulfur hexafluoride
A gas-insulated substation (GIS) uses a superior dielectric gas, sulfur hexafluoride (SF6), at a moderate pressure for phase to phase and phase to ground insulation.

What is substation preventive maintenance?

Preventive maintenance to electrical substations consists of physical inspection of equipment, cleaning, lubrication, readjustment of connections, including testing, modifications, adjustments, and replacement of parts, in order to keep all electrical substations in good working order.

What is the function of sub station?

The purpose of a substation is to ‘step down’ high voltage electricity from the transmission system to lower voltage electricity so it can be easily supplied to homes and businesses in the area through lower voltage distribution lines.

What is sub station equipment?

Substations generally have switching, protection and control equipment, and transformers. In a large substation, circuit breakers are used to interrupt any short circuits or overload currents that may occur on the network.

Why gas insulated substation is smaller?

The atmospheric air insulation used in a conventional, air-insulated substation (AIS) requires meters of air insulation to do what SF6 can do in centimeters. GIS can therefore be smaller than AIS by up to a factor of 10. As a result, GIS is more reliable and requires less maintenance than AIS.

What are the main equipments in 33 kV sub-station?

Sub-station Maintenance 2. WEL- Maintained 3. Main Equipments in 33 KV Sub-Station 1) Power transformer 2) Circuit breaker 3) Isolator 4) Earthing switch 5) lightning arrestor 6) Busbar 7) Current transformer 8) Potential transformer 9) Protective relay 10) DC battery set 11)Capacitor bank 12)Fire fighting system 4.

What is the SLD for 132kV substation?

As in the case of 132KV Substation, the SLD shall show Lightening Arrestor, C.T/P.T Unit, Isolators, Protection and Metering P.T & C.T. Circuit Breakers, again Isolators and circuit Breakers, Main Power Transformer, all protective devices/relays and other special equipment like CVT, GUARD RINGS, etc as per design criteria.

What is the maximum voltage a sub-station can be erected?

However, when the atmosphere is contaminated with impurities, these sub-stations can be erected for voltages up to 66 KV. 4 f (ii) Outdoor sub-stations:- For voltages beyond 66KV, equipment is invariably installed out-door.

What is the maintenance of 11kV switchgear?

MAINTENANCE OF 11KV SWITCHGEAR  Proper condition of the switchgear should be monitored by regular inspections.  Inspection is primarily to constitute a visual check for corrosion and moisture.  Proper mechanical/electrical function of the following facilities: switching devices, interlocking, protection and signaling facilities