Online monitoring device for turn-to-turn insulation fault of air-core power reactor

Abstract

The invention relates to an online monitoring device for a turn-to-turn insulation fault of an air-core power reactor, which is characterized by comprising a method for judging a turn-to-turn insulation fault of the air-core power reactor through changes in value of a loss factor. The online monitoring device is composed of a signal extraction portion, a signal conversion control portion, a computer operation portion and a display and alarm portion, and is characterized in that terminal voltage and current signals of a monitored reactor are extracted by applying a voltage transformer and a current transformer, the terminal voltage and current signals are zoomed so as to conform to a processing range of an AD converter, a single-chip microcomputer controls the AD converter to perform processing on analog voltage and current signals, the processed analog voltage and current signals are sent to a computer to perform analysis and calculation on a loss factor, active power and reactive power are calculated through current and voltage signals, and the loss factor is calculated; changes of the loss factor tan<delta> is monitored online in real time, the loss factor tan<delta> is compared with a loss factor tan<delta> threshold under normal power reactor running, a running state of the reactor is displayed, and an alarm is given out when the loss factor tan<delta> exceeds the threshold. The online monitoring device realizes online monitoring for the air-core power reactor; a detection objective is realized via the proposed method of being according to changes of the loss factor, thereby promoting and expanding a new direction of online monitoring for the air-core power reactor; and the running reliability of the air-core power reactor is improved.

Description

technical field [0001] The invention relates to the technical field of on-line monitoring of air-core power reactors, and more specifically, relates to a research on on-line monitoring of inter-turn insulation of air-core power reactors. Background technique [0002] With the development of my country's economy and the improvement of science and technology, the power system is increasingly developing in the direction of long-distance, large capacity, and high voltage. As an important part of the power system, reactors have reactive power compensation, phase shifting, current limiting, Steady flow and filtering. The air-core power reactor was first successfully developed by the Canadian TE company in the 1970s. This dry-type reactor has a relatively simple structure and good performance. After it was put into operation, it gradually replaced the old-fashioned air-core reactor. Because of the advantages of simple structure and light weight, it has been widely used in power sys...

AI Technical Summary

Problems solved by technology

During the operation of air-core power reactors, due to insulation aging, damp coils, frequent switching, and partial arcing, the reactor turns to short-circuit faults, causing the reactor to catch fire, burning the reactor, and causing irreversible damage. Therefore, it is necessary to study a main On-line monitoring technology for short-circuit faults A device that detects faults at the early stage of short-circuits

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