110kV变阻抗变压器短路电流首峰值限制方法

doi:10.19595/j.cnki.1000-6753.tces.L90546

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摘要该文研究110kV变阻抗变压器（VIT）短路电流首峰值限制方法。发生短路时,通过人工过零回路在短路电流上升阶段开断快速开关,使短路电流流过与高压绕组串联的内置限流电抗器从而被限制。仿真计算变阻抗变压器短路电流首峰值随短路瞬间电压相位的变化关系,结果表明,仅当电压相位处于[-180°, -120°]、[-60°, 60°]以及[120°, 180°] 3个区间时才有必要进行人工过零限流,现有快速真空开关分闸时间及短路故障识别算法时间满足限流方案要求。快速开关开断后,变阻抗变压器绕组的短路电流将继续增长。通过提前触发人工过零回路,同时减小人工过零回路电容器电容量,可将变阻抗变压器短路电流首峰值限制到与快速开关保持分闸状态相同的水平。限流方案可采用大电流试验回路进行验证,其对快速开关开断能力的考验比实际变压器出口短路更严格。

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	马奎
	王曙鸿
	姚晓飞

关键词 ：变阻抗变压器, 短路电流, 快速真空开关, 人工过零

Abstract：The fist peak limit method of short-circuit current of 110kV variable impedance transformer (VIT) is studied. In case of short-circuit, the fast vacuum circuit breaker (FVCB) is interrupted in the short-circuit current rising stage through artificial zero-crossing circuit, so that the short-circuit current flows through the built-in current-limiting reactor (in series with the high-voltage winding) and therefore be limited. The relationship between the first peak value of 110kV VIT short-circuit current and the voltage phase angle at the moment of short circuit is simulated. The results show that it is necessary to limit the short-circuit current only when the phase angle is in the intervals of [-180°, -120°], [-60°, 60°] and [120°, 180°],and the FVCB opening time and short-circuit fault identification algorithm time meet the requirements of current limiting scheme. After the FVCB be interrupted, the short-circuit current of the VIT winding will continue to increase. By triggering the artificial zero-crossing branch in advance and reducing the capacitance of the artificial zero-crossing circuit’s capacitor, the first peak value of the short-circuit current of the VIT can be limited to the same level as that of maintaining the FVCB open state. The current limiting scheme can be verified by large current test loop, which is more stringent in testing the breaking capacity of FVCB than the actual transformer outlet short-circuit.

Key words： Variable impedance transformer short-circuit current fast vacuum circuit breaker artificial zero-crossing

收稿日期: 2020-08-06

PACS:

TM418

基金资助:国家电网公司科技资助项目（5229DK150004）

通讯作者: 马奎男,1982年生,高级工程师,研究方向为快速开关及电网限流技术。E-mail: m.k.ma@163.com

作者简介: 王曙鸿男,1968年生,教授,博士生导师,研究方向为电路、电磁场及多物理场的理论、数值分析方法和软件技术。E-mail: shwang@mail.xjtu.edu.cn

引用本文:

马奎, 王曙鸿, 姚晓飞. 110kV变阻抗变压器短路电流首峰值限制方法[J]. 电工技术学报, 2021, 36(zk2): 723-729. Ma Kui, Wang Shuhong, Yao Xiaofei. Limiting Method of First Peak of Short-Circuit Current of 110kV Variable Impedance Transformer. Transactions of China Electrotechnical Society, 2021, 36(zk2): 723-729.

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