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This component is measured using a toroidal transformer put around the three phases + neutral, phase + neutral, or the earth connection. To an earth default, the presence of a homopolar component is significant. The core balance transformer enables the measurement of residual currents directly (earth leakage current). The various diameters adapt to different wire sections and leakage currents. The toroidal transformer is built around a high-quality magnetic core to see fault currents even at extremely low levels. As a result, the trip contacts in the control circuit are switched.Ī toroidal transformer is required to detect the leakage current by the earth leakage relay. When a fault occurs, the trip function of the relay is activated. The earth leakage relay has a definite time operating characteristic with adjustable trip sensitivity and delay. The earth leakage current is measured by the relay using a toroid. For these objectives, an earth leakage relay is used.Īn electronic device that detects earth failures is the earth leakage relay. As a result, a special protection mechanism to disconnect the energy and the load is required. If significant fault currents are present, hazardous voltages may emerge on earthed equipment, putting life in danger. Unidentified fault currents can cause cables to overheat, perhaps causing a fire. 8 Earth Fault Relay VS Earth Leakage Relay.4 Why Is an Earth Leakage Relay Needed?.3 How Does an Earth Leakage Relay Work?.
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