铁路工程造价管理
鐵路工程造價管理
철로공정조개관리
RAILWAY ENGINEERING COST MANAGEMENT
2012年
2期
19-22
,共4页
铁路%电气化%牵引%变压器%负序电流%仿真
鐵路%電氣化%牽引%變壓器%負序電流%倣真
철로%전기화%견인%변압기%부서전류%방진
electric railway%traction transformer%negative phase sequence%simulation
电气化铁道属于不对称供电系统,为降低牵引变压器及接纱方式对电力系统的负序影响,经电力、铁路部门研究,提出采用新型平衡牵引变压器,该牵引变压器采用中间带抽头的Scott接线方式。根据其接线方式及特点,分析其电气特性,推导一次侧与二次侧绕组电流的变换关系、负序电流计算公式,并以工程实例进行该牵引变压器负序电流仿真计算。电流仿真计算表明:由于牵引变电所两供电臂电流的差异,采用不同的牵引变压器及接线方式,产生的负序电流是不同的,新型平衡牵引变压器及接线方式产生的负序电流,在一定的持续时间内介于V/V接线牵引变压器和单相接线牵引变压器之间。
電氣化鐵道屬于不對稱供電繫統,為降低牽引變壓器及接紗方式對電力繫統的負序影響,經電力、鐵路部門研究,提齣採用新型平衡牽引變壓器,該牽引變壓器採用中間帶抽頭的Scott接線方式。根據其接線方式及特點,分析其電氣特性,推導一次側與二次側繞組電流的變換關繫、負序電流計算公式,併以工程實例進行該牽引變壓器負序電流倣真計算。電流倣真計算錶明:由于牽引變電所兩供電臂電流的差異,採用不同的牽引變壓器及接線方式,產生的負序電流是不同的,新型平衡牽引變壓器及接線方式產生的負序電流,在一定的持續時間內介于V/V接線牽引變壓器和單相接線牽引變壓器之間。
전기화철도속우불대칭공전계통,위강저견인변압기급접사방식대전력계통적부서영향,경전력、철로부문연구,제출채용신형평형견인변압기,해견인변압기채용중간대추두적Scott접선방식。근거기접선방식급특점,분석기전기특성,추도일차측여이차측요조전류적변환관계、부서전류계산공식,병이공정실례진행해견인변압기부서전류방진계산。전류방진계산표명:유우견인변전소량공전비전류적차이,채용불동적견인변압기급접선방식,산생적부서전류시불동적,신형평형견인변압기급접선방식산생적부서전류,재일정적지속시간내개우V/V접선견인변압기화단상접선견인변압기지간。
Electric railway is non - balance power system . To reduce the influence of high - speed railway NPS ( Negative Phase Sequence), railway and power workers studied out the 220kV balance transformer. This transformer is Scott transformer with secondary midpoint draw - out. According the mode of connection and characteristic, this article analyses the electric characteristic, deduces the current relation of first side and secondary side winding, deduces the NPS computational formula, calculate the NPS of this transformer base on engineering project. From the circulating and simulation of NPS, this article gets the points : because current of the two feeding section is different, the NPS is different from the several modes connection of transformer. The NPS of New balance transformer is in the middle of V/V transformer and single phase transformer when the duration time is given.