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
