摘要
首先简要地阐述了近年来利用变压器的磁通特性鉴别励磁涌流的两种具有代表性的方法 ,在此基础上 ,提出了基于磁通特性的改进型变压器保护方案 ,阐述了该保护方案的基本原理 ,推导出了基于该原理的两绕组和三绕组变压器的动作方程 ,并针对该保护方案中的几个问题进行了探讨 ,该方案不依赖二次谐波制动原理和间断角闭锁原理 ,避开了变压器难以得到的内部参数 ,具有数据采集方便、计算量小、动作迅速等特点。最后对此方案进行了试验 ,并给出了该保护方案的应用框图。
This paper presents the basic principle of the improved transformer protection method based on the transformer model. Its operation equations of twowinding and threewinding transformers are derived from this principle. According to the equations, the improved transformer protection method is presented. The method does not need the second harmonic principle, dead angle restraint principle and the internal parameters got difficultly. The advantages of the method are convenient data acquisition, quick calculation and operation,etc. The results of testing confirmed that the method is able to clear the internal fault reliably and quickly.
出处
《继电器》
CSCD
北大核心
2003年第9期9-14,共6页
Relay
