Method of calculating inductance of reactor in inter-turn short circuit fault state

Abstract

The invention discloses a method of calculating the inductance of a reactor in an inter-turn short circuit fault state, comprising the following steps: S1, building a multi-layer multi-turn coil model of a dry hollow reactor; S2, building a method of calculating the total magnetic vector potential of the hollow reactor under the condition of no short-circuit turn; S3, calculating the total magnetic vector potential and coupling inductance at a short-circuited turn in the built model; S4, based on the Kirchhoff voltage balance equation, calculating the short-circuit current of the short-circuited turn according to the AC resistance of the short-circuited turn, the coupling inductance of the short-circuited turn and the inductance of the short-circuited turn; and S5, calculating the reverse flux caused by the short-circuited turn based on the short-circuit current of the short-circuited turn, calculating the total magnetic vector potential at a non-short-circuited turn through the method in S2 to get the flux of the non-short-circuited turn, and calculating the total inductance of the reactor according to the reverse flux of the short-circuited turn and the flux of the non-short-circuited turn. The weakening effect of the ring current in the short-circuited turn on the inductance of the reactor is considered. The calculation accuracy of the total inductance of the dry hollow reactor in a fault state is improved.

Description

technical field [0001] The invention relates to the field of numerical calculation and analysis of electric power equipment, in particular to a method for calculating the inductance of a dry-type air-core reactor under inter-turn short-circuit state. Background technique [0002] In recent years, dry-type air-core reactors often have faults during operation. Judging from the actual operating conditions of dry-type air-core reactors at home and abroad and a large number of statistical data, the main cause of dry-type air-core reactor burning is inter-turn short circuit fault. Therefore, it is of great significance to the diagnosis and on-line monitoring of dry-type air-core reactor inter-turn short circuit fault. The calculation of reactor parameters is very important in the study of inter-turn short circuit fault diagnosis and on-line monitoring. Due to the special electrical structure of the reactor, the parameter changes caused by inter-turn short circuit are mainly reflec...

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Problems solved by technology

[0004] The present invention provides a reactor inductance calculation method under the turn-to-turn short-circuit fault state, which solves the existing dry-type air-core reactor in-turn short-circuit state reactor inductance calculation method, which ignores the reactor inductance caused by the circulating current in the short-circuit turns The weakenin

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