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In this lab, students tested the settings of a relay to check its pick up and timing functions. The minimum current to start the relay was 1.01A. Graph 1 shows the timing data taken from the tests at various current levels from 1.3A to 5A, all within ±5% of the 1A final setting. There are two types of earth fault relays: a residual current earth fault relay which detects earth fault currents and interrupts supply if current flows through earth, and a sensitive earth fault relay which measures residual curre

Author

Anna Ri

Language

EN