Range limitation for a protection device in a power supply netwo

Details Range limitation for a protection device in a power supply netwo Range limitation for a protection device in a power supply netwo

1987-03-27

1988-03-15

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 80, 361 86, 364483, 324522, H02H 338

Patent

active

047316888

ABSTRACT:
A method and device for range limitation and direct tripping for protection in the event of a fault on an electrical power line extending between two stations (P, Q) involves employing a travelling wave model in one of the stations (P) which, with the aid of measured currents and voltages in that station, to calculate the voltage distribution at a number of control points along the line. The range of the protection device is indicated as the distance between the measuring station and that control point for which a voltage difference (.delta.u) becomes equal to zero. The voltage difference consists of the difference between the absolute value of a voltage differene between the absolute value of a voltage difference (.DELTA.u), formed as the sum of a voltage value (U") calculated with the travelling wave model for the control point at a certain time, and the corresponding voltage value (U') one half-period earlier and the absolute value of the latter voltage value. When the voltage difference becomes greater than zero, direct tripping can be initiated.

REFERENCES:
patent: 3629658 (1970-05-01), Helge
patent: 4342063 (1982-07-01), Thornell
patent: 4352136 (1982-09-01), Ericksson
patent: 4426670 (1983-01-01), Ilar et al.
patent: 4591992 (1986-05-01), Yamaura
patent: 4636909 (1987-01-01), Brandt

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