Which current is used in substation?
In a substation or power station, DC supply is used for Opening and Closing of Circuit breakers, to operate protective relays, to operate isolators, indication lamps, alarm circuits, PLCC(Power Line Carrier Communication) Panels, Emergency Lights in Control Rooms, etc.
How much power is in a substation?
Usually for economy of construction the collector system operates around 35 kV, although some collector systems are 12 kV, and the collector substation steps up voltage to a transmission voltage for the grid.
How is 400 kV transmitted?
It is first stepped up to 400 kV by a transformer and then transmitted across the country in aluminium cables roughly 2 cm in diameter. High voltages are used because the power loss per kilometre (I2R) for a given power output will be much less at high voltage and low current than at low voltage and high current.
What is a 400 220 kV substation?
400/220/132 KV substation. The first step towards the design of a 400/220/132 KV substation is to determine the load that the substation has to cater and develop it accordingly. The substation is responsible for catering bulk power to various load centres distributed all around through 220 KV and 132 KV substations.
What is 11kV substation?
11 KV Substation. Pole-Mounted Sub-Station: 1. It is a distribution sub-station placed overhead on a pole. It is the cheapest form of substation as it does not involve any building work.
What are different types of substation?
Types of Sub Stations
- Step-up Type Substation. This type of substation gets the power supply from a near producing facility.
- Customer Substation.
- System Stations.
- Distribution Type Substation.
- Step-down Type Substation.
- Underground Distribution Substation.
- Switchyard.
- 11kv Substation.
What is kV substation?
220kV substation equipment. This is accomplished by suitable apparatus called Substation. For example, generation voltage (11KV or 6.6KV) at the power station is stepped up to high voltage (say 220KV or 132KV) for transmission of electric power. The assembly of apparatus (e.g. transformer etc.)
Is it OK to live next to a substation?
There is some concern that pylons and substations near homes (or businesses) can pose potential health problems for people nearby. However, EMFs emitted by pylons and substations can raise the risk of developing health problems when placed close to people and buildings.
Is safe distance from 400 kV line?
For the 400 kV, 500 MW line under consideration, the flux density of 1.265 mg is reached when x = 77m; this implies that the safe clearance distance is 77m from the line centre on the either side. Thus, the overall safe clearance distance is 154m.
What is 11kv substation?
What does a switchyard do?
A switchyard or substation is an assembly of apparatus which transforms the characteristics of electrical energy from one place to another and controls the flow of power. Switchyard controls the exchange of electrical energy.
Why 11kV 22kv 33kV 66kv?
But we already know that there are some voltage drop due to the resistance of the transmission lines. For this reason, they transmit 10% extra voltage. Sending Voltage = 10kV x 10% = 11kV. While the receiving end voltage are 10kV due to voltage drop.
How is power received from a 400 kV substation?
The power is received on 400 KV busbar (double main and transfer bus scheme). 636 MW power is dispatched to a 400 KV substation ‘a’ catering an area having diversity factor 1.1 through 400 KV double circuit lines working at 70% loading.
What is the diversity factor of a 220 kV substation?
Three 220 KV double circuit lines working at 80% loading feeds substations ‘d’,’e’,’f’ working at a diversity factor of 1.35 to meet a demand of 200 MW each. The remaining 288 MW is fed to three 160 MVA autotransformers working at an average 75% loading and 0.8 power factor.
What kind of transformers are used in 132 kV substation?
After dispatching 310 MW power, the remaining 15 MW power available from 132 KV bus is stepped down using 132/33 KV & 33/0.415 KV two winding transformers. This power is used for auxiliary purposes like pumping, lighting, AC and ventilation purposes within the substation to ensure its smooth functioning.
How is power supplied to the busbar from station E?
A single circuit line from station E working at 68% loading supplies 85 MW while a double circuit line from station D working at 70% loading supplies 175 MW power to the busbar. This ensures continuity of supply to certain extent even when an entire 315 MVA transformer unit fails to operate.