Synchrocheck relay · Voltage, frequencyandfasedisplacement check ·Over /Under Voltage ·Over /Under Frequency · DeadLine /DeadBus programmableoperation. ·C/Bclosing timecontrol · Event recording ·ModbusCommunicationProtocol · UL /CSA listed
TheSCM21numericalsynchrocheckrelaymeasuresvoltageandfrequencyof threeinputs; thevoltage, frequencyandphase angleoftwoinputs(1UL=Line1and2UL=Line2)areindividuallycomparedwiththoseofthethirdinput(BU=Bus)consideredas reference. Therelayperformsthefollowingprogrammablefunctions: !Synchrocheckoftwolineswithathirdline; !Normal/DeadBus/DeadLineoperationmodes; !AdjustableMaxVoltagedifference; !AdjustableMaxFrequencydifference; !AdjustableMaxPhasedisplacement; !AdjustableMin/MaxBusvoltageforsynchrocheckenable; !AdjustableMin/MaxBusfrequencyforsynchrocheckenable; !AdjustableReclosetime; !AutomaticAdjustingofphaseangleforcircuitbreakerclose; !AdjustableOverVoltagelevel(F59)withadjustabletimedelay; !AdjustableUnderVoltagelevel(F27)withadjustabletimedelay; !AdjustableOverFrequencylevel(F81>)withadjustabletimedelay; !AdjustableUnderFrequencylevel(F81<)withadjustabletimedelay; !3Digital Inputsopticallyisolated2kV;
Microelettrica SCM21 Synchrocheck Relay
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