CAJ | 학술논문

分析一起特高压变电站主变冷却器双电源系统误并列事故；指出导致事故的主因是特高压变电站站内和站外电源系统相角差过大，为各电压等级Yd接线变压器相位转换及电网功角带来的固有现象；导致事故的次因为变压器冷却器双电源控制回路中断路器／隔离刀闸位置启动冷却器回路功能设计不合理所致。影响事故的主因无法改进。重点分析了该冷却器控制回路逻辑及存在问题，提出了由断路器／隔离刀闸位置中间继电器接点分别启动两接触器的双电源控制回路改进方案。理论分析及现场试验均证明该方案的可行性。对超／特高压主变压器冷却器双电源切换回路的设计、调试和运行维护有借鉴意义。
분석일기특고압변전참주변냉각기쌍전원계통오병렬사고；지출도치사고적주인시특고압변전참참내화참외전원계통상각차과대，위각전압등급Yd접선변압기상위전환급전망공각대래적고유현상；도치사고적차인위변압기냉각기쌍전원공제회로중단로기／격리도갑위치계동냉각기회로공능설계불합리소치。영향사고적주인무법개진。중점분석료해냉각기공제회로라집급존재문제，제출료유단로기／격리도갑위치중간계전기접점분별계동량접촉기적쌍전원공제회로개진방안。이론분석급현장시험균증명해방안적가행성。대초／특고압주변압기냉각기쌍전원절환회로적설계、조시화운행유호유차감의의。
This paper analyzed an accident that a UHV transformer cooling device’ s dual power circuit was mis?takenly shorted. The main reason is the angular phase difference between UHV substation inside and outside power supply was relatively larger, which was caused by transformers’ connections in different voltage levels and power angle in power grid. The secondary reason is that the transformer cooling device’ s start?up circuit which was started by breakers and switches state was unreasonable. The main reason of it could not be improved. In addition, logic and problems of the cooling device’ s power control circuit were analyzed. And improved program, breakers and switches state relay should separately start the two contacts in dual power, was proposed. Theoretical analysis and test both prove that the improved program is feasible. Thus, it may provide reference for designing, debugging, op?erating and maintaining work of EHV and UHV transformer cooling device’ s dual power control circuit.