Chapter: Protection and Switchgear : Operating Principles and Relay Characteristics

Static relays

Due to the amplification of energizing signals obtainable, the sources need only provide low power. Therefore the size of the associated current and voltage transformers could be reduced.

Static relays

Advantages of static relays

• Due to the amplification of energizing signals obtainable, the sources need only provide low power. Therefore the size of the associated current and voltage transformers could be reduced.

• Improved accuracy and selectivity.

• Fast operation of relays and hence fast clearance of faults.

• Flexibility of circuitry would allow new and improved characteristics.

• The relays would be unaffected by the number of operations.

Basic circuits employed

• Timers

• Phase comparators

• Amplitude Comparator

• Level detectors

• Integrators

• Polarity detectors

High reliability operational amplifiers are used for realizing the basic components of static relays.

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Protection and Switchgear : Operating Principles and Relay Characteristics : Static relays |