A 400 & 765 kV reactor is a vital component in Extra High Voltage (EHV) transmission systems, designed to absorb excess reactive power and stabilize voltage across long transmission corridors. In India, these are typically shunt reactors connected to 765 kV busbars in substations, with ratings ranging from 50 MVAR to 110 MVAr. Built as oil‑immersed outdoor units with robust insulation and cooling systems ONAN, they counteract the capacitive charging currents generated by long 400 kV lines, which otherwise cause dangerous overvoltage’s during light load or load rejection conditions.
The purpose of a 400 kV & 765kV reactor is to maintain voltage stability, improve power quality, and protect the grid against transient surges. By absorbing reactive power, they prevent overvoltage, enhance system reliability, and ensure safe operation of transmission networks. These reactors are indispensable in India’s 400 kV & 765kV substations and inter‑regional corridors, especially where renewable energy integration and long‑distance transmission demand precise voltage control. In short, they act as the voltage stabilizers of the EHV grid, safeguarding both equipment and system performance.
Technical Details
- 125MVAr,400kV 3 Phase
|
Sr. No |
Rating (MVAr) |
Voltage (kV) |
I2R (kW) |
Total Loss (kW) |
Reactance |
Impulse (kV) |
|
1 |
125 |
400 |
90 |
160 |
1411.2 |
1300 |
- 110MVAr 765kv 1 Phase
|
Sr. No |
Rating (MVAr) |
Voltage (kV) |
I2R (kW) |
Total Loss (kW) |
Reactance |
Impulse (kV) |
|
1 |
110 |
765 |
60 |
120 |
2438.4 |
1950 |
- 50-125MVAr 400kv 3 Phase
|
Sr. No |
Rating (MVAr) |
Voltage (kV) |
I2R (kW) |
Total Loss (kW) |
Reactance |
Impulse (kV) |
|
1 |
50-125 |
400 |
90 |
160 |
3528-1411.2 |
1300 |