Method for detecting a failed ZnO disk in a surge arrester netwo

Details Method for detecting a failed ZnO disk in a surge arrester netwo Method for detecting a failed ZnO disk in a surge arrester netwo

1996-02-21

1997-04-15

Wieder, Kenneth A.

Electricity: measuring and testing

Testing potential in specific environment

Voltage probe

324547, 324551, 340647, G01R 3102

Patent

active

056213093

ABSTRACT:
A method of detecting failed disks in power-system surge arresters comprising a network of at least two parallel-coupled stacks of series-coupled ZnO varistors includes measuring differential current flow through each pair of stacks during surge voltage conditions, and comparing the current so measured with a fixed fraction of the total current carried by the arrester. Because each stack contains a like number of substantially identical varistors, current flow through the stack containing a failed disk will measurably exceed current flow through each non-defective stack. If the measured current flow through a stack is excessive relative to current flow through the remaining stacks, the excessive current flow stack is presumed to contain a defective disk. In today's technology, precision Rogowski coils or fiber-optic current sensors provide the high-bandwidth, high dynamic-range transducers necessary for the measurement of both total and differential current.

REFERENCES:
patent: 4075549 (1978-02-01), Woodward
patent: 4157496 (1979-06-01), St-Jean
patent: 4259666 (1981-03-01), Takahashi et al.
patent: 4507701 (1985-03-01), Fujiwara et al.
patent: 4803436 (1989-02-01), Kresge et al.
patent: 4866393 (1989-09-01), Iwai et al.
patent: 5087885 (1992-02-01), Bergstrom

Affiliated with

Also associated with

Rating

Method for detecting a failed ZnO disk in a surge arrester netwo does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for detecting a failed ZnO disk in a surge arrester netwo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for detecting a failed ZnO disk in a surge arrester netwo will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-363520