CAJ | 학술논문

2014年3月4日云广直流发生了直流过压保护(59/37DC-II)动作跳闸事件,暴露出直流测量系统切换不能避免单一测量元件故障导致的保护误动问题。对该事件的分析发现,59/37DC-II保护和基于IIR2滤波功能模块的行波保护(WFPDL)、电压突变量保护(27du/dt)、接地极母线保护(87EB)在测量系统切换后都存在着数据不能及时跟随问题。通过引入TDM总线的切换信号,并取消59/37DC-II段保护的保护差值平均值处理的方法解决了59/37DC-II保护的问题,采用IIR2S滤波功能模块替换IIR2滤波功能模块,并利用TDM总线切换信号进行处理,解决了WFPDL、27du/dt、87EB保护的问题。仿真和现场运行情况证实了所提措施的正确性。
2014년3월4일운엄직류발생료직류과압보호(59/37DC-II)동작도갑사건,폭로출직류측량계통절환불능피면단일측량원건고장도치적보호오동문제。대해사건적분석발현,59/37DC-II보호화기우IIR2려파공능모괴적행파보호(WFPDL)、전압돌변량보호(27du/dt)、접지겁모선보호(87EB)재측량계통절환후도존재착수거불능급시근수문제。통과인입TDM총선적절환신호,병취소59/37DC-II단보호적보호차치평균치처리적방법해결료59/37DC-II보호적문제,채용IIR2S려파공능모괴체환IIR2려파공능모괴,병이용TDM총선절환신호진행처리,해결료WFPDL、27du/dt、87EB보호적문제。방진화현장운행정황증실료소제조시적정학성。
On March 4, 2014, the DC over-voltage protection (59/37DC-II) in Yun-Guang UHVDC project acted, leading to a DC tripping event, which exposes a problem that a DC protection incorrect tripping due to single measuring unit fault is possible after DC measure system switching. Based on analysis of this event it is found that 59/37DC-II protection and some other protections based on IIR2 filtering function model such as the traveling wave protection(WFPDL), undervoltage sensing protection (27du/dt), grounding electrode bus protection (87EB) have the same problem that the data can not follow immediately the DC measure system switching. The problem in 59/37DC II protection is solved by introducing the TDM bus swiching signal and canceling the average proceccing of protection differentials. The problems in WFPDL, 27du/dt, 87EB protection are solved by replacing the IIR2 filtering function model with the IIR2S filtering function model and using the TDM bus switching signal. Simulations and on-site operations verify the correct-ness of the proposed measures.