Method and apparatus for detecting flashover between conductors

Details Method and apparatus for detecting flashover between conductors Method and apparatus for detecting flashover between conductors

1992-12-01

1994-10-04

Strecker, Gerald R.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324539, 340664, 364492, G01R 3108

Patent

active

053529839

ABSTRACT:
The invention relates to a method and a device for detecting a flashover between conductors in power transmission lines of different voltage levels suspended from the same towers and wherein the power lines are included in a power network where one of the power lines is stated to be a high-voltage power line (1) and where the other power lines are connected to the high-voltage line via transformers of a known transformer ratio (am) and internal impedance (ZXm) and wherein the line impedances (ZL) are known. Specific to the invention is that the fault current which is caused by a flashover is set to be equal to a detected current change in any of the phases in the high-voltage line. With this assumption an equation system can be set up with the aid of which the relative distance to fault n (0<n<1) can be determined. If the produced value of n lies within the stated region, this is interpreted as if an internal flashover has occurred.

REFERENCES:
patent: 4251766 (1981-02-01), Souillard
patent: 4499417 (1985-02-01), Wright et al.
patent: 4559491 (1985-12-01), Saha
patent: 4800509 (1989-01-01), Nimmersjo324522
"Distance Protection of Double-Circuit Lines with Different Rated Voltages During Intersystem Faults", H. Becker et al, Cigre Conference paper 34-206, Paris 1990.

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