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《Automation of Electric Power Systems》 1983-01
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A New Directional Relay Based on the Variation of Power Frequency Components

Shen Guorong  
In this paper, a new type of directional relay based on the principle of the variation of power frequency components is proposed.In case of power system fault, the phases of power frequency components between voltage and current variation are compared in this relay .On the one hand, on account of the utilization of the variation of the faulty components, it has some features similar to travelling wave protection. On the other hand, the utilization of power frequency components makes it possible to employ the measures used in ordinary relays (e.g.using impedance simulation method to eliminate nonperiodic component, using impedance compensation method to improve its voltage sensitivity, using phase comparison through integration for improving its immunity to interference, etc.) .The operating principle is simple and easy for the users .Therefore, it has the advantages of simple structure, quick response, high reliability and wide adaptability.
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