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This paper shows a case study of a partial discharge (PD) test in a 230kV/2000A circuit breaker that was performed in a substation. Two sorts of sensors were used: a high frequency current transformer (HFCT) installed in equipment's grounding conductor and an antenna that is used to estimate the location of discharge source. Partial discharge signatures obtained previously at the laboratory were used...
In the United States, “grounded” and “grounding” are defined by the National Electrical Code (NEC), which is concerned with the safety of life and property.
The application of the residual current principle, as carried out by zero sequence current protective devices, is one of the most efficient ways to reduce the hazard of electric shock in case of the failure of equipment's basic insulation-to-ground. Highly sensitive, and regularly tested, residual current operated circuit-breakers without integral overcurrent protection devices (RCCBs) are rightfully...
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