适用电子式互感器的变压器保护磁通制动技术

为了解决传统变压器磁通制动技术在电子式互感器应用场合下的使用局限性,提出了一种适用于电子式互感器及三相变压器的磁通复判保护技术。介绍了磁通制动技术在变压器差动保护中的运用情况及存在问题,讨论了电子式互感器暂态特性对磁通制动原理的影响。研究了基于三相变压器差动保护的转角补偿、涌流选相、陷阱复判等问题,给出了保护算法实现流程。实验结果表明,适用电子式互感器的磁通制动技术能大幅提高差动保护动作速度,同时具备可靠的涌流识别能力。

Flux restraint technology of transformer protection for electronic transformer

In order to solve the limitations of traditional transformer flux restraint technology in electronic transformer application, this paper proposes a flux complex judgment technology for electronic transformer and three-phase transformer. The application situation and the existing problems of flux restraint technology are introduced in transformer differential protection, the influence of transient characteristics of electronic transformer on flux restraint theory is discussed, the problems of angle compensation, inrush current phase selection, trap multiple identification which are used in differential protection of three-phase transformer are researched, and the algorithm implementation process is given. Experiments show that flux restraint theory for electronic transformer can greatly improve the speed of the action of differential protection, and has the reliable identification ability for inrush current.