适用于空载合闸于匝间故障的特高压换流变压器保护新方法

金恩淑; 吴宛凝; 张弼弘; 朱宏; 耿梦炜

金恩淑,吴宛凝,张弼弘,朱宏,耿梦炜.适用于空载合闸于匝间故障的特高压换流变压器保护新方法[J].电测与仪表,2025,62(5):58-67.
Jin Enshu,Wu Wanning,Zhang Bihong,Zhu Hong,Geng Mengwei.A new protection method for UHV converter transformers suitable for no-load closing andinter-turn faults[J].Electrical Measurement & Instrumentation,2025,62(5):58-67.

适用于空载合闸于匝间故障的特高压换流变压器保护新方法

A new protection method for UHV converter transformers suitable for no-load closing andinter-turn faults

DOI：10.19753/j.issn1001-1390.2025.05.007

中文关键词: 励磁涌流内部故障空载合闸于匝间故障斯皮尔曼系数零序电流绝对值时间系数

英文关键词:excitation inrush current, internal fault, no-load closing to inter-turn fault, Spearman coefficient, zero-sequence current absolute value time coefficient

基金项目:国家重点研发计划智能电网技术与装备重点专项(2016YFB0900600)

作者中文名	作者英文名	单位
金恩淑	Jin Enshu	东北电力大学电气工程学院
吴宛凝	Wu Wanning	东北电力大学电气工程学院
张弼弘	Zhang Bihong	东北电力大学电气工程学院
朱宏	Zhu Hong	东北电力大学电气工程学院
耿梦炜	Geng Mengwei	东北电力大学电气工程学院

摘要点击次数: 96

中文摘要:

特高压直流输电系统具有较高的电压等级且为交直流混联，他们之间的耦合关系更为密切，换流变压器产生的励磁涌流和故障电流呈现与普通变压器不同的特性，导致传统保护无法正确识别。文章根据斯皮尔曼系数和零序电流绝对值时间系数，提出了一种识别特高压换流变压器励磁涌流的新方法。该方法针对励磁涌流与内部故障绝对值波形前半周波与后半周波趋势相反计算其斯皮尔曼系数，根据斯皮尔曼系数的值构成区分励磁涌流和内部故障的主判据，针对空载合闸于匝间故障时其波形特征具有涌流的特性，将其网侧零序电流绝对值的时间系数作为辅助判据。通过PSCAD/EMTDC软件仿真，结果表明所提方法能够有效区分励磁涌流和内部故障，并能有效避免因空载合闸于匝间故障造成的保护误制动。由此，换流变压器系统的安全性可以得到明显的改善。

英文摘要:

The ultral high voltage direct current (UHVDC) transmission system has a high voltage level and is a mixed AC and DC connection, which makes the coupling relationship between them more closely, so that the converter transformer has different characteristics from ordinary transformers in the case of excitation inrush current and internal faults, which causes traditional protections cannot be well identified. In this paper, according to the Spearman coefficient and the time coefficient of absolute value of zero-sequence current, a new method for identifying excitation inrush current of UHV converter transformer is proposed. This method first calculates the Spearman coefficient of the absolute value waveforms of the excitation inrush current and the internal fault in the front and back half-week waves. In view of the waveform characteristics of no-load closing with inrush current characteristics under inter-fault, the time coefficient of the absolute value of the zero-sequence current on the grid side is used as the auxiliary criterion. Through PSCAD/EMTDC software simulation, it is proved that the method proposed in this paper can effectively distinguish the excitation inrush current from the internal fault, and can effectively avoid the protection fault braking caused by the no-load closing on the inter-turn fault. Thus, the safety of converter transformer system can get obvious improvement.

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