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Distorted line to earth voltage on the output terminals of the inverter of variable speed drives results in an earth fault current comprising harmonics. Higher-order harmonics in the earth fault current have a negative effect on tripping of residual current devices. In some cases sensitivity of residual current devices rapidly decreases and protection against electric shock is not effective. In the...
The most popular means of protection against indirect contact in low voltage systems is automatic disconnection of supply, since it is a simple and economically attractive way to achieve safety in an electrical installation. As a protective device, residual current devices (RCDs) are commonly used. In certain conditions using the RCDs is obligatory. The widespread application of static converters,...
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