Online monitoring method for turn-to-turn insulation fault of dry air core reactor

Abstract

The invention discloses a monitoring method for a turn-to-turn insulation fault of a dry air core reactor and is suitable for the monitoring, identification and early warning of early and developmentperiods of a reactor turn-to-turn short-circuit fault. By setting a magnetic field detecting coil of a differential structure near at the surface of a dry air reactor near upper and lower star arms, areactor magnetic field transient signal is obtained, and the development stage of a reactor turn-to-turn insulation fault is judged. The purpose of the early identification and early warning of the abnormal working state of the reactor is achieved. At the same time, the high-voltage isolation is realized by using signal wireless transmission, and the work reliability and safety of a reactor bodyare ensured.

Description

technical field [0001] The invention relates to an on-line monitoring method for an inter-turn insulation fault of a dry-type air-core reactor, in particular to a state monitoring method for a dry-type air-core reactor during inter-turn short circuit. Background technique [0002] Dry-type air-core reactor has the advantages of light weight, low noise, flexible installation and simple maintenance, and has good adaptability and high reliability. It can realize the functions of compensating stray capacitive current and limiting short-circuit current. It is widely used in power system. [0003] With the large-scale application of dry-type air-core reactors and the frequent occurrence of extreme weather, sandstorms, haze, frost, rain, and kite bird damage, dry-type air-core reactors have failed, and the number of accidents has gradually increased. [0004] When the reactor is found to be abnormal on site, the product often has severe arcing and ablation, and a short circuit rin...

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Problems solved by technology

[0012] The above method 1 needs to symmetrically set the detection induction coils from the top and bottom of the reactor to form a differential signal. Although the signal is sensitive and reliable, the insulation creepage distance on the outer surface of the reactor is greatly reduced, which seriously affects the operation safety of the reactor. Applied to high-voltage dry-type air-core reactor

The above methods 2, 3, and 5 require sensors to detect the temperature and vibration signals of several set parts of the reactor. For reactors operating in harsh outdoor environments, the real-time detection of such weak temperature signal changes and vibration spectrum signal changes Poor performance, reliability, and sensitivity. It is difficult to identify local temperature changes in the initial stage and development stage of reactor inter-turn short circuit faults. Therefore, the early warning ability and reliability are difficult to meet the actual needs of operating state monitoring.

The above method 4 provides a monitoring method for the power loss coefficient of the reactor, but for the dry-type air-core reactor with hundreds of turns, the real-time performance, reliability and sensitivity of the power loss coefficient change are poor, and it is difficult for the initial stage and development It is difficult to identify short-circuit faults between turns of reactors in the early stage, so the early warning ability and reliability are difficult to meet the actual needs of operating status monitoring

[0013] In addition, the above schemes 1, 2, 3, 4, and 5 all use the method that the signal line is led from the high voltage position of the reactor to the electronic monitoring equipment with low potential. This transmission method is suitable for large capacity and high voltage reactors It is very dangerous, and this kind of signal access and transmission at the primary (primary) equipment end of the power grid is not allowed

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