Apparatus for detecting faults on power transmission lines

Details Apparatus for detecting faults on power transmission lines Apparatus for detecting faults on power transmission lines

1989-09-14

1993-04-13

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Electrolytic systems or devices

Liquid electrolytic capacitor

361 93, 361107, H02H 726

Patent

active

052028127

ABSTRACT:
In a system for transmitting an electrical power supply by means of an over-head power transmission line supported by power transmission towers, a fault such as a short-circuit fault and a ground fault is detected by providing optical current sensors having opto-magnetic elements and opto-electric field elements on respective conductors of the transmission line to detect a fault current and fault voltage on the basis of the Faraday's effect and Pockel's effect. Light beams passing through the elements are modulated by the magnetic fields induced by the currents passing through the conductors and the voltages on the conductors, and thus include information about the current and voltage. There is further provided a circuit for calculating a distance to a fault point in accordance with the detected current, voltage and a phase difference therebetween and a known impedance of the power transmission line. The thus calculated distance to the fault point is displayed on display means which is arranged at the power transmission tower or the substation.

REFERENCES:
patent: 4363061 (1982-12-01), Vaerewyck et al.
patent: 4675773 (1987-06-01), Shirakawa et al.
patent: 4810836 (1989-03-01), Shinoda et al.
patent: 4855861 (1989-08-01), Bergman et al.
patent: 5103164 (1992-04-01), Kawaguchi

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