电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2015年
14期
137-142
,共6页
铁磁材料%电流互感器%剩磁%剩磁系数%双向直流法%不确定度分析
鐵磁材料%電流互感器%剩磁%剩磁繫數%雙嚮直流法%不確定度分析
철자재료%전류호감기%잉자%잉자계수%쌍향직류법%불학정도분석
ferromagnetic material%current transformer%residual flux%residual flux factor%bidirectional DC method%uncertainty analysis
针对剩磁系数传统测试法的不足,提出一种双向直流法测取剩磁系数.省去测试前消磁这一步骤,对电磁式电流互感器进行正向激励,去激励,反向激励和激励操作,采集相关的励磁电压和电流信号,计算出激励过程中的磁通变化量从而测试到剩磁系数.基于此直流法研制了剩磁测量仪.通过对比试验和不确定度分析,结果表明,基于双向直流法的剩磁测量仪可以准确测取电磁式电流互感器的剩磁系数.
針對剩磁繫數傳統測試法的不足,提齣一種雙嚮直流法測取剩磁繫數.省去測試前消磁這一步驟,對電磁式電流互感器進行正嚮激勵,去激勵,反嚮激勵和激勵操作,採集相關的勵磁電壓和電流信號,計算齣激勵過程中的磁通變化量從而測試到剩磁繫數.基于此直流法研製瞭剩磁測量儀.通過對比試驗和不確定度分析,結果錶明,基于雙嚮直流法的剩磁測量儀可以準確測取電磁式電流互感器的剩磁繫數.
침대잉자계수전통측시법적불족,제출일충쌍향직류법측취잉자계수.성거측시전소자저일보취,대전자식전류호감기진행정향격려,거격려,반향격려화격려조작,채집상관적려자전압화전류신호,계산출격려과정중적자통변화량종이측시도잉자계수.기우차직류법연제료잉자측량의.통과대비시험화불학정도분석,결과표명,기우쌍향직류법적잉자측량의가이준학측취전자식전류호감기적잉자계수.
Aiming at the disadvantage of traditional test method for residual flux factors, this paper proposes a bidirectional DC method to measure residual flux factors. It omits the procedure of demagnetization before test, adopts positive excitation, de-excitation, negative excitation, and excitation on electromagnetic CT, collects relevant excitation voltage and current signals, and calculates the change of magnetic flux during excitation and thus obtains residual flux factors through test. Based on the DC method, a residual flux measuring instrument is designed. The comparison test and uncertainty analysis show that bidirectional DC test method based residual flux measuring instrument can accurately measure the residual flux factors of electromagnetic CT.
