Application Notes for KCGG High Impedance Protection

Application Notes forKCGG high Impedance Protection2 Application Notes forKCGG high Impedance ProtectionIntroductionThe Application of the kcgg numerical overcurrent relay asdifferential Protection for machines,power transformers and busbarinstallations is based on the highimpedance differential principle,offering stability for any type of faultoccurring outside the protected zoneand satisfactory operation for faultswithin the high Impedance relay is definedas a relay or relay circuit whosevoltage setting is not less than thecalculated maximum voltage whichcan appear across its terminalsunder the assigned maximumthrough fault current can be seen from Figure 1 thatduring an external fault the throughfault current should circulatebetween the current transformersecondaries.

5 The KCGG The KCGG142 is a numerical 3 phase overcurrent and earth fault relay with 3 stages of phase and earth fault protection, I>/Io>, I>>/ Io>> and I>>>/Io>>> which …

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  Notes, Applications, High, Protection, Impedance, Kcgg, Application notes for kcgg high impedance protection

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