Analysis and Calculation of Inter-turn Short Circuit in Dry-type Air-core Reactor

LUO Bing

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Analysis and Calculation of Inter-turn Short Circuit in Dry-type Air-core Reactor

POWER CAPACITOR & REACTIVE POWER COMPENSATION

Analysis and Calculation of Inter-turn Short Circuit in Dry-type Air-core Reactor
干式空心电抗器匝间短路的分析与计算
Guilin Wuhan Electric Equipment Manufacture Co., Ltd, Guilin 541004, China
(2026)
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LUO Bing. Analysis and Calculation of Inter-turn Short Circuit in Dry-type Air-core Reactor[J/OL]. Power Capacitor & Reactive Power Compensation, 2026.
DOI：

LUO Bing. Analysis and Calculation of Inter-turn Short Circuit in Dry-type Air-core Reactor[J/OL]. Power Capacitor & Reactive Power Compensation, 2026. DOI：

摘要

本文对干式空心电抗器发生匝间短路的原因进行了分析，原因主要归纳为5种：局部过热、过电压、振动、绝缘弱点或老化、局部放电等。并针对几种故障情况，进行具体原因的分析判断。为了量化分析匝间短路后变化显著的物理量，以电流为变量列出匝间短路后的电路方程组，给出一种用于计算电感的公式，编程序计算了电抗器在不同位置发生匝间短路时短路电流的大小，计算结果表明，总回路电流几乎不变，总回路有功电流变化显著；短路位置在不同支路时，在中间（最少匝数所在之处）的变化最大，在最外层的稍小，在最里层的最小；短路位置在同一支路时，在中间的变化最大，在顶端的变化最小。最后通过试验验证了计算结果的正确性。

Abstract

This paper analyzes the causes of inter-turn short circuits in dry-type air-core reactors

which are mainly summarized into five types: local overheating

overvoltage

vibration

insulation weakness or aging

and partial discharge

etc. And for several fault conditions

specific cause analysis and judgment are carried out. To quantitatively analyze the physical quantities that change significantly after inter-turn short circuits

the circuit equations after inter-turn short circuits are listed with current as the variable

and a formula for calculating inductance is given. A program is written to calculate the magnitude of the short-circuit current when inter-turn short circuits occur at different positions of the reactor. The calculation results show that the total loop current almost remains unchanged

while the total loop active current changes significantly; when the short-circuit position is in different branches

the change is the largest in the middle (where the minimum number of turns is located)

slightly smaller in the outermost layer

and the smallest in the innermost layer; when the short-circuit position is in the same branch

the change is the largest in the middle and the smallest at the top. Finally

the correctness of the calculation results was verified through experiments.

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references

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Related Institution

Institute of Electrical Engineering, Chinese Academy of Sciences

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