Feeder Protection Relay

Phase Comparison Carrier Protection

Phase Comparison Carrier Protection: The phase comparison pilot-relaying operates on the principle of comparing the phase position of the currents at the two ends of the protected section. The Phase Comparison Carrier Protection of these currents is made over carrier channels. During normal conditions or through faults the currents entering the line at one end, …

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Selection of Distance Relay

Selection of Distance Relay: The factors to be considered for the Selection of Distance Relay scheme can be enumerated as follows: Speed of operation. Measuring relay characteristics. Fault coverage. Economic considerations. 1. Speed of Operation: Operating time is of great importance on systems which are liable to become unstable if the fault persists for more …

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Current and Voltage Connection in Distance Relay

Current and Voltage Connection in Distance Relay: It is essential for the distance relay to measure the same distance between the fault and the relay under any type of fault condition. It is possible to supply the relays so that they will always measure Z1 the positive sequence impedance of the protected feeder, by suitable …

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Distance Protection by Reactance Relays

Distance Protection by Reactance Relays: Like impedance relays, Distance Protection by Reactance Relays are also amplitude comparators and thus require an additional directional unit. Although the performance of reactance relays on single-fed systems is not unduly affected by fault resistance, there may be occasions in double-fed systems where errors in reach may occur, particularly when …

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Distance Protection Impedance Relay

Distance Protection Impedance Relay: Distance Protection Impedance Relay – It has already been pointed out that the impedance is directly proportional to the length of the line, and hence an impedance relay which measures impedance can be used to recognise a fault condition and operate. As such an impedance relay has no directional feature and …

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