基于单芯移相变压器的差动保护配置研究

移相变压器能够有效调控潮流，为保障电力系统安全可靠运行，为移相变压器配置性能优良的保护不可或缺。以某示范工程的35 kV单芯对称型移相变压器为研究对象，提出相应的本体保护方案。首先，基于基尔霍夫电流定律和电磁感应定律分析其运行特性。然后，结合其拓扑结构，设计了保护用电流互感器的安装位置，构建了电平衡差动保护和磁平衡差动保护方案。此方案可覆盖单芯移相变压器内部各绕组和绕组引线相间故障以及各绕组匝间故障。最后，基于Matlab/Simulink平台搭建单芯移相变压器模型，通过设置本体内部典型故障，验证了提出的两种差动保护配置方案的有效性。

Differential protection configuration based on a single core phase shifting transformer

A phase-shifting transformer can effectively regulate the flow of electricity, and it is essential to equip it with high-performance protection devices to ensure the safe and reliable operation of the power system. Taking a 35 kV single-core symmetrical phase-shifting transformer as the research object, this paper proposes a corresponding protection scheme for the transformer. First, the operating characteristics of the transformer are analyzed based on Kirchhoff’s current law and the law of electromagnetic induction. Then, based on its topological structure, the installation position of the protection current transformer is designed, and electrical and magnetic balance differential protection schemes are constructed. This scheme can cover the internal phase-to-phase faults and winding-to-winding faults of each winding and the winding lead of the single-core phase-shifting transformer. Finally, a single-core phase-shifting transformer model is built on the Matlab/Simulink platform by setting up typical faults within the transformer body, and the validity of the two differential protection configuration schemes proposed is verified.