CAJ | 학술논문

分析了共铁心式电炉变压器的结构特点,提出将3个单相变压器中性点解开后重新连接,在主变压器和调压变压器中性点之间接入电流互感器,形成电炉变压器中性点横差保护.当电炉变压器发生内部匝间故障、同相不同支路间故障以及相间故障时,中性点横差保护能够可靠动作,同时可作为补偿电容器纵差保护的后备保护.并利用动模试验验证了中性点横差保护的动作性能.试验结果表明:作为电炉变压器纵差保护的有效补充,中性点横差保护可显著提高电炉变压器差动保护的灵敏性和可靠性.
분석료공철심식전로변압기적결구특점,제출장3개단상변압기중성점해개후중신련접,재주변압기화조압변압기중성점지간접입전류호감기,형성전로변압기중성점횡차보호.당전로변압기발생내부잡간고장、동상불동지로간고장이급상간고장시,중성점횡차보호능구가고동작,동시가작위보상전용기종차보호적후비보호.병이용동모시험험증료중성점횡차보호적동작성능.시험결과표명:작위전로변압기종차보호적유효보충,중성점횡차보호가현저제고전로변압기차동보호적령민성화가고성.
Analyzes the structure characteristic of common iron core electric furnace transformer, puts forward that reconnected neutral point of three single phase transformers after which were untied, current transformer were connected between the neutral point of the main transformer and voltage-reg?ulating transformer, forms neutral point transverse differential protection of electric furnace transform?er. When interturn fault, same phase but different branches fault and phase fault happened in electric furnace transformer, neutral point transverse differential protection can reliably act and to be the back?up protection of longitudinal differential protection for compensating capacitor. Using dynamic model test verified the action performance of neutral point transverse differential protection. The test result shows that as the effective supplement of longitudinal differential protection for electric furnace trans?former, neutral point transverse differential protection can markedly improve the sensitivity and reli?ability of differential protection for electric furnace transformer.