CAJ | 학술논문

提高变压器差动保护的安全性和灵敏性一直是学术界关注的热点问题。故障分量差动保护由于灵敏度更高,已经在实际运行中得到广泛应用,但是该保护（包括全电流差动保护）判据由于固定了动作特性曲线的有关参数,导致不能同时提高保护的安全性和灵敏度。文中提出了一种自适应比率差动保护的新判据,该判据可以根据系统运行状态来调节动作特性各参数,能更可靠区分区内、区外故障,相比传统的故障分量差动保护具有更高的灵敏度和安全性。特高压变压器的动模试验验证了该保护判据的有效性。最后,对电流互感器局部暂态饱和情况下该判据的防误动能力进行了分析。
제고변압기차동보호적안전성화령민성일직시학술계관주적열점문제。고장분량차동보호유우령민도경고,이경재실제운행중득도엄범응용,단시해보호（포괄전전류차동보호）판거유우고정료동작특성곡선적유관삼수,도치불능동시제고보호적안전성화령민도。문중제출료일충자괄응비솔차동보호적신판거,해판거가이근거계통운행상태래조절동작특성각삼수,능경가고구분구내、구외고장,상비전통적고장분량차동보호구유경고적령민도화안전성。특고압변압기적동모시험험증료해보호판거적유효성。최후,대전류호감기국부잠태포화정황하해판거적방오동능력진행료분석。
It has been the focus of study on improving the security and sensitivity of transformer differential protection recently.Because of its higher sensitivity,differential protection based on fault component has been widely used in practice.But traditional criterion of differential protection is impossible to improve both security and sensitivity of protection simultaneously with setting fixed characteristic curve.A new criterion for adaptive protection that can adjust the parameters of protection characteristic according to operation modes of power grid is proposed.It can reliably discriminate fault inside or outside region and has higher sensitivity and security than that of traditional differential protection based on fault component.The feasibility and superiority of this method are proved by dynamic simulation test on an ultra-high voltage transformer.Finally,the ability of the new criterion to avoid mal-operation under the circumstances of current transformer with partial transient saturation is analyzed.