Abstract
As a primary protection of high voltage (HV) and extra high voltage (EHV) transmission line, distance protection needs to operate as fast as possible for faults inside its protection zone, whilst it also must be able to discriminate between internal and external faults to prevent unnecessary disconnection of the healthy lines. The operational performances of distance protection during dynamic conditions are specified in the latest IEC 60255-121 standard. The standard describes different tests that need to be performed using a transient network simulator and how the test results to present. In this paper, an implementation of the dynamic testing of distance protection based on the IEC 60255-121 standard will be presented. The network modelling and the simulation of test cases described in the standard are implemented using ATP-EMTP. The test results of two distance relays show that depending on the dynamic conditions, the operational performance of the relay might be affected. In some situations, the operating time of the relays was delayed, while, in other conditions, the accuracy of impedance measurement is affected causing the relay to overreach
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