Section 12 Multipurpose protection12.1 General current and voltage protection CVGAPC12.1.1 IdentificationFunction description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberGeneral current and voltage protection CVGAPC 2(I>/U<) -12.1.2 ApplicationA breakdown of the insulation between phase conductors or a phase conductor andearth results in a short circuit or an earth fault respectively. Such faults can result inlarge fault currents and may cause severe damage to the power system primaryequipment. Depending on the magnitude and type of the fault different overcurrentprotections, based on measurement of phase, earth or sequence current componentscan be used to clear these faults. Additionally it is sometimes required that theseovercurrent protections shall be directional and/or voltage controlled/restrained.The over/under voltage protection is applied on power system elements, such asgenerators, transformers, motors and power lines in order to detect abnormal voltageconditions. Depending on the type of voltage deviation and type of power systemabnormal condition different over/under voltage protections based on measurementof phase-to-earth, phase-to-phase, residual- or sequence- voltage components can beused to detect and operate for such incident.The IED can be provided with multiple General current and voltage protection(CVGAPC) protection modules. The function is always connected to three-phasecurrent and three-phase voltage input in the configuration tool, but it will alwaysmeasure only one current and one voltage quantity selected by the end user in thesetting tool.Each CVGAPC function module has got four independent protection elements builtinto it.1. Two overcurrent steps with the following built-in features:1MRK 502 071-UEN - Section 12Multipurpose protectionGenerator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 445Application manual
