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Protection Relay of Phase-Shifting Device with Thyristor Switch for High Voltage Power Transmission Lines

机译：高压输电线路带晶闸管开关的移相装置保护继电器

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摘要

Problems of functioning of differentia] current protection systems of phase shifting devices (PSD) with mechanically changed coefficient of transformation of shunt transformer are analyzed. Requirements for devices of protection of PSD with thyristor switch are formulated. Based on use of nonlinear models of series-wound and shunt transformers of PSD modes of operation of major protection during PSD, switching to zero load operation and to operation under load and during short circuit operation were studied for testing PSD with failures. Use of the principle of duplicating by devices of differential current protection (with realization of functions of breaking) of failures of separate pares of PSD with thyristor switch was substantiated. To ensure protection sensitivity to the shunt transformer winding short circuit, in particular, to a short circuit that is not implemented in the current differential protection for PSD with mechanical switch, the differential current protection reacting to the amount of primary ampere-turns of high-voltage and low-voltage winding of this transformer was designed. Studies have shown that the use of differential current cutoff instead of overcurrent protection for the shunt transformer wndings allows one to provide the sensitivity during thyristor failure with the formation of a short circuit. The results of simulation mode for the PSD with switch thyristor designed to be installed as switching point of Voskhod-Tatarskaya-Barabinsk 220 kV transmission line point out the efficiency of the developed solutions that ensure reliable functioning of the PSD.
机译：分析了具有并联变压器变换系数的机械变化的移相装置（PSD）的差动电流保护系统的功能问题。制定了用晶闸管开关保护PSD的设备要求。基于PSD的主要保护运行方式的PSD的串联绕组和并联变压器的非线性模型，研究了切换到零负载运行以及在有负载和短路运行期间的运行，以测试带有故障的PSD。证实了利用可控硅开关的PSD的单独部分的故障的差动电流保护（实现断路功能）复制装置原理的使用。为了确保对并联变压器绕组短路（特别是对于机械开关的PSD电流差动保护中未实现的短路）的保护灵敏度，差动电流保护对高电流的一次安匝数做出反应。设计了该变压器的低压绕组。研究表明，在并联变压器组中使用差动电流截止代替过流保护可以使人们在晶闸管故障期间提供灵敏度，并形成短路。设计为安装为Voskhod-Tatarskaya-Barabinsk 220 kV输电线路开关点的开关晶闸管PSD的仿真模式结果表明，所开发解决方案的效率可确保PSD的可靠运行。

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