Transcription of Directional Overcurrent Relaying (67) Concepts
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Directional Overcurrent Relaying (67) Concepts
John Horak, Member, IEEE Basler Electric Abstract Directional Overcurrent Relaying (67) refers to Relaying that can use the phase relationship of voltage and current to determine direction to a fault. There are a variety of Concepts by which this task is done. This paper will review the mainstream methods by which 67 type Directional decisions are made by protective relays. The paper focuses on how a numeric Directional relay uses the phase relationship of sequence components such as positive sequence (V1 vs. I1), negative sequence (V2 vs. I2), and zero sequence (V0 vs. I0) to sense fault direction, but other Concepts such as using quadrature voltage ( , VAB vs IC) are included. Index Terms: Directional Relaying , sequence component, negative sequence, zero sequence, 67, 32, quadrature voltage.
voltage transmission lines, a fault can be in two different directions from a relay, and it can be highly desirable for a ... on P=Re[VxI*]) for directional control, though in some circumstances a 32 element may not be a good indication of direction to fault. This paper will review some of the various ... can be restated in symmetrical ...
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