A Directional Wave Detector Relay With Enhanced Application Capabilities for EHV and UHV Lines

Giuliante, A.T.; Slatem, R.R.; Stranne, G.; Ohlen, C.

doi:10.1109/tpas.1983.318138

Cited by 6 publications

References 4 publications

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High Speed Digital Directional Comparison Relaying

Prakash

Malik

Hope

1988

Electric Machines & Power Systems

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A high speed directional comparison relay based on the evaluation of the locally measured deviations of the voltage and current from their prefault values is described in this paper. Signal processing techniques are used to damp out the exponentially decaying dc component and high frequency transient components so that the operation of the relay depends on the power frequency components of the voltage and current deviation signals. The direction to a fault is determined by detecting the first transgression of the fault trajectories across threshold boundaries in the deviation plane. Studies on a three phase power system model show that the direction to a fault is determined within a first few milliseconds following the inception of a fiult.

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High Speed Digital Directional Comparison Relaying

Prakash

Malik

Hope

1988

Electric Machines & Power Systems

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Amplitude comparator based algorithm for directional comparison protection of transmission lines

Prakash

Malik

Hope

1989

IEEE Trans. Power Delivery

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A high speed directional comparison relay based on the evaluation of the locally measured deviations of the voltage and the phase shifted current from their prefault values is described in this paper. The operation of the relay depends on the power frequency components of the voltage and phase shifted current deviation signals. The direction to a fault is determined by an amplitude comparator technique which compares a discriminant value with a positive or negative threshold. Simulation studies on a three-phase power system model show that the direction to a fault is determined within the first few milliseconds following the inception of a fault. Studies over a wide range of faults and source impedance angles show that the proposed amplitude comparator technique performs better than an analogous phase comparator technique. '

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