Section 11 Multipurpose protection11.1 General current and voltage protection CVGAPC IP14552-1 v211.1.1 IdentificationM14886-2 v3Function description IEC 61850identificationIEC 60617identificationANSI/IEEE C37.2device numberGeneral current and voltageprotectionCVGAPC 2(I>/U<) -11.1.2 Application IP15008-1 v1M13084-3 v4A breakdown of the insulation between phase conductors or a phase conductor and groundresults in a short circuit or a ground fault respectively. Such faults can result in large fault currentsand may cause severe damage to the power system primary equipment. Depending on themagnitude and type of the fault different overcurrent protections, based on measurement ofphase, ground or sequence current components can be used to clear these faults. Additionally it issometimes required that these overcurrent protections shall be directional and/or voltagecontrolled/restrained.The over/under voltage protection is applied on power system elements, such as generators,transformers, motors and power lines in order to detect abnormal voltage conditions. Dependingon the type of voltage deviation and type of power system abnormal condition different over/under voltage protections based on measurement of phase-to-ground, phase-to-phase, residual-or sequence- voltage components can be used 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-phase current and three-phasevoltage input in the configuration tool, but it will always measure only one current and one voltagequantity selected by the end user in the setting tool.Each CVGAPC function module has got four independent protection elements built into it.1. Two overcurrent steps with the following built-in features:1MRK 511 364-UUS A Section 11Multipurpose protection165Application manual
