Method for diagnosing inter-turn insulation faults of dry type electric reactors on basis of frequency response analysis

Abstract

The invention discloses a method for diagnosing inter-turn insulation faults of dry type electric reactors on the basis of frequency response analysis. By the aid of the method, the problem of incapability of timely detecting inter-turn insulation breakdown and occurred inter-turn short-circuit for existing dry type electric reactors in the prior art can be solved. The method includes applying voltage signals at different frequencies to A-phase windings, B-phase windings and C-phase windings of each three-phase dry type hollow electric reactor (2) by the aid of a frequency response analyzer (9), and acquiring electric reactor impedance amplitude-frequency response characteristic curves under the condition of the various voltage signals at the frequencies; comparing the electric reactor impedance amplitude-frequency response characteristic curves acquired at the second step under the condition of the various voltage signals at the frequencies to electric reactor impedance amplitude-frequency response characteristic curves when the three-phase dry type hollow electric reactor is put into operation, and diagnosing that inter-turn short-circuit faults of the three-phase dry type hollowelectric reactor already occur if correlation coefficients of each electric reactor impedance amplitude-frequency response characteristic curve under the condition of the voltage signals at the frequencies and the corresponding electric reactor impedance amplitude-frequency response characteristic curve are smaller than 1. The frequency ranges of the voltage signals are 0-1000 thousand hertz. Themethod has the advantages that the inter-turn insulation faults are detected in advance and are handled in advance, and accordingly burning loss of the dry type hollow electric reactors can be effectively prevented.

Description

technical field [0001] The invention relates to a method for detecting whether an insulation short circuit occurs between turns of a dry-type reactor widely used in a substation, in particular to a method for diagnosing the short-circuit between turns of a dry-type air-core reactor. Background technique [0002] Dry-type air-core reactor is an inductive device, which plays the role of reactive power compensation and filtering in substations, and is widely used in power supply systems. The operating environment of dry-type air-core reactor is harsh, and it operates outdoors all the year round. The sun and rain also accelerate the aging of its insulation, which is easy to cause a short circuit after the inter-turn insulation of dry-type air-core reactor is damaged, resulting in the burnout of the reactor, which seriously affects the The normal operation of the power supply department. The dry-type air-core reactor adopts a hollow structure, which well avoids the occurrence of...

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Problems solved by technology

[0003] The invention provides a method for diagnosing inter-turn insulation faults of dry-type reactors based on frequency response analysis, which solves the technical problem that the existing technology cannot timely diagnose the inter-turn insulation damage of dry-type reactors and the occurrence of inter-turn short circuits

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