Earthfault Detection Requirements for a transient-relay:

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Presentation transcript:

Earthfault Detection Requirements for a transient-relay: High ohmic earthfaults up to some kOhm Restriking faults Intermittent faults Directional Independence from the moment of ignition

Earthfault Detection Transient behaviour of an earthfault qu - algorithm Low ohmic earthfault High ohmic earthfault Intermittent faults Field tests Summary

Beginn of an Earthfault Change of the voltages during the charging process

Discharge of the Faulty Phase

Charge of the Healthy Phases

Simplified Equivalent Circuit

Low Ohmic Earthfault Two healthy feeders Faulty feeders

qu – algorithm

High Ohmic Earthfault

qu – algorithm

Restriking Fault

Restriking Fault

Field Tests

Field Tests

Field Tests

Field Tests

Field Tests

Field Tests

Field Tests

Summary Detection of high ohmic transients is now possible Direction of the earthfault can be detected also during restriking and intermittent earthfaults The sensitivity can be selected direct as function of the capacitive current Ice Restriking faults can occur at ⇨ cable networks ⇨ poles made of concrete ⇨ configurations with an air gap ⇨ configurations with time-invariant resistance

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