电力系统自动化
電力繫統自動化
전력계통자동화
AUTOMATION OF ELECTRIC POWER SYSTEMS
2010年
2期
80-83
,共4页
差动保护%励磁涌流%二次谐波%自适应
差動保護%勵磁湧流%二次諧波%自適應
차동보호%려자용류%이차해파%자괄응
differential protection%magnetizing inrush current%the 2nd order harmonics%adaptive
在简述传统二次谐波制动原理和存在问题的基础上,分析了空投于无故障变压器和有故障变压器时差动电流基波含量和二次谐波含量的变化特性.利用该特性提出一种自适应的励磁涌流制动方法.通过该方法实时判断变压器的运行状态,确定可靠闭锁或及时开放差动,解决现有方法在励磁涌流制动和差动保护正确快速动作之间的矛盾,提高了励磁涌流制动的灵敏性,确保变压器在仅有励磁涌流的情况下可靠制动,在任何有区内故障的情况下又能正确快速动作.
在簡述傳統二次諧波製動原理和存在問題的基礎上,分析瞭空投于無故障變壓器和有故障變壓器時差動電流基波含量和二次諧波含量的變化特性.利用該特性提齣一種自適應的勵磁湧流製動方法.通過該方法實時判斷變壓器的運行狀態,確定可靠閉鎖或及時開放差動,解決現有方法在勵磁湧流製動和差動保護正確快速動作之間的矛盾,提高瞭勵磁湧流製動的靈敏性,確保變壓器在僅有勵磁湧流的情況下可靠製動,在任何有區內故障的情況下又能正確快速動作.
재간술전통이차해파제동원리화존재문제적기출상,분석료공투우무고장변압기화유고장변압기시차동전류기파함량화이차해파함량적변화특성.이용해특성제출일충자괄응적려자용류제동방법.통과해방법실시판단변압기적운행상태,학정가고폐쇄혹급시개방차동,해결현유방법재려자용류제동화차동보호정학쾌속동작지간적모순,제고료려자용류제동적령민성,학보변압기재부유려자용류적정황하가고제동,재임하유구내고장적정황하우능정학쾌속동작.
Following the discussion of traditional 2nd order harmonics restraint principle and its deficiency, the paper analyzes variation characteristics of the fundamental component and 2nd order harmonics component of differential current when a normal transformer is energized and when a faulty transformer is energized. Based on the characteristics, a new adaptive inrush current restraint principle is proposed. The method judges the real-time operation state of a transformer and ensures secure blocking and dependable activation of differential protection operation. The method solves the conflict of inrush restraint and correct and fast protection operation, and improves restraint sensitivity, which ensures that the restraint takes effect only when inrush current occurs and the correct and fast protection operates when any internal fault happens.
