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...

AI Technical Summary

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 weakening effect of the reactor leads to the technical problem of inaccurate calculation, and the technical effect of improving the calculation accuracy of the total inductance value of the dry-type air-core reactor under the fault state is realized by taking into account the weakening effect of the circulating current in the short circuit on the reactor inductance

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