CAJ | 학술논문

对配电变压器低压侧互联以降低配电网损耗的经济运行方式进行了研究.分析了配电站采用经济运行方式时负荷切换的原理,提出了基于损耗最小原理的负荷切换点选取原则并给出了低压侧备用电源自动投切装置的工作原理和动作逻辑.重点对三相变压器的空载合闸及有栽合闸暂态过程进行数学建模,并采用Matlab仿真计算与实际分析相结合的方法,分析了三相配电变压器在切换过程中产生的空载合闸励磁涌流以及有载合闸冲击电流.结合配电变压器电流速断保护和反时限过流保护的整定原则,分析了励磁涌流和冲击电流对变压器继电保护动作特性及参数整定的影响,验证了变压器低压侧互联的经济运行方式下的供电可靠性.
대배전변압기저압측호련이강저배전망손모적경제운행방식진행료연구.분석료배전참채용경제운행방식시부하절환적원리,제출료기우손모최소원리적부하절환점선취원칙병급출료저압측비용전원자동투절장치적공작원리화동작라집.중점대삼상변압기적공재합갑급유재합갑잠태과정진행수학건모,병채용Matlab방진계산여실제분석상결합적방법,분석료삼상배전변압기재절환과정중산생적공재합갑려자용류이급유재합갑충격전류.결합배전변압기전류속단보호화반시한과류보호적정정원칙,분석료려자용류화충격전류대변압기계전보호동작특성급삼수정정적영향,험증료변압기저압측호련적경제운행방식하적공전가고성.
The economic operation mode of distribution transformers interconnected at low voltage side to reduce distribution network loss is researched.The load switchover principle of distribution substation under economic operation mode is analyzed,the rules of load switehover point selection based on the minimal loss theory are proposed,and the working principle and action logic of the automatic switchover equipment at low-voltage side is presented.The transient process of three-phase transformer switching-on with and without load is mathematically modeled.With Matlab simulative calculation and practical analysis,the inrush excitation current of the switching-on without load and the impact current of switching-on with load are analyzed.Combined with the setting principles of instantaneous overcurrent protection and inverse time overcurrent protection,the influence of inrush current and impact current on the operating characteristics and parameter setting of transformer protections are studied.The reliability of power supply under economic operation mode of distribution transformers interconnected at low voltage side is verified.