Line Protection or Feeder Overview Simple
Line Protection or Feeder Overview Simple, -The length of the electric power transmission line is generally quite long and through the open air, so the occurrence of interference in the electric power transmission line is much higher. That is when compared to disturbances in transformers and alternators of electric power. That is the reason why transmission lines require far more protection schemes than transformers and alternators.
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Electrical Line Protection must have some special features, such as:
- During a fault, the only circuit breaker closest to the fault point must trip.
- If the circuit breaker closest to the fault point fails to trip, the circuit breaker next to this breaker trips as a backup.
- The operating time of the relay associated with line protection should be kept to a minimum to prevent unnecessary disconnection of circuit breakers associated with other parts of the healthy power system.
The above requirements cause transmission line protection to be much different when compared to the protection of transformers or other power system equipment. The three main methods of transmission line protection are as follows:
- Time is rated over current protection.
- Differential protection.
- Distance protection.
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