摘要
目前高阻抗变压器采用的高压侧过流保护在低压侧区内故障时灵敏度不足,无法满足主电源侧的变压器相间短路后备保护主要作为变压器内部故障的后备保护的要求。在分析了高阻抗变压器内部构造的基础上,提出了一种新的变压器保护方案,即采用低压侧复压和电流保护,不仅可以提高高阻抗变压器低压侧内部相间故障的灵敏度,而且在低压侧外部故障低压侧CT严重饱和时仍然可以对变压器进行保护。这种方案在微机变压器保护装置中简单易行,可提高高阻抗变压器保护装置的灵敏性和可靠性。
Present HV side overcurrent protection adopted by high impedance transformers shows insufficient sensitivity in LV side inner fault, which can not meet the requirement of backup protection against transformer interphase short-circuit of the main power side for mainly being the back-up protection against transformer internal fault. Based on the analysis of the internal structure of high-impedance transformer, a new transformer protection is proposed, that is using the LV side compound voltage sum-current protection, which can not only improve the sensitivity of LV side phase-to-phase fault of high-impedance transformer, but also still protect the transformer as LV side CT saturation occurs in LV side external fault. This program is simple and easy-using in microprocessor transformer protection devices, which can improve the sensitivity and reliability of the high-impedance transformer protection device.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第22期166-169,共4页
Power System Protection and Control
关键词
高阻抗变压器
后备保护
灵敏度
复压和电流
high impedance transformer, backup protection
sensitivity
compound voltage sum-current
