高电压技术
高電壓技術
고전압기술
HIGH VOLTAGE ENGINEERING
2012年
2期
387-392
,共6页
特高压(UHV)%变压器%励磁曲线%剩磁%合闸电阻%谐振过电压%励磁涌流
特高壓(UHV)%變壓器%勵磁麯線%剩磁%閤閘電阻%諧振過電壓%勵磁湧流
특고압(UHV)%변압기%려자곡선%잉자%합갑전조%해진과전압%려자용류
ultra high voltage（UHV）%transformer%excitation curve%remnant magnetism%closing resistor%resonance overvoltage%inrush current
为研究从1 000kV侧合闸空载特高压（UHV）变压器的暂态特性,并确定其过电压和励磁涌流的幅值,从而为以后运行中合闸空载变压器的操作方式提供技术依据,首先将特高压交流试验示范工程系统调试时合空变过电压和励磁涌流的实测结果与模拟计算结果进行了对比,并找出了合理的的变压器励磁曲线和剩磁取值以提高仿真模型的准确性,在此基础上进行了合闸空载变压器的模拟计算。结果表明,变压器励磁曲线的电压不宜取得过低,变压器剩磁宜取40%～50%。将所选取的变压器励磁曲线和剩磁运用到特高压交流试验示范工程扩建工程的合空变研究中,并计算了从1 000kV侧合闸特高压空载变压器的过电压和励磁涌流。研究结果表明,合闸特高压空载变压器产生谐振过电压的可能性比合闸500kV变压器大,长治站和荆门站特高压空载变压器合闸均没有出现谐振过电压,而南阳站合闸第2台特高压变压器时产生了标幺值〉1.3（基准值为（槡2×1 100/槡3）kV）的谐振过电压,并且基本上不衰减;合闸电阻可有效地抑制该谐振过电压;合闸时产生的励磁涌流均不大。
為研究從1 000kV側閤閘空載特高壓（UHV）變壓器的暫態特性,併確定其過電壓和勵磁湧流的幅值,從而為以後運行中閤閘空載變壓器的操作方式提供技術依據,首先將特高壓交流試驗示範工程繫統調試時閤空變過電壓和勵磁湧流的實測結果與模擬計算結果進行瞭對比,併找齣瞭閤理的的變壓器勵磁麯線和剩磁取值以提高倣真模型的準確性,在此基礎上進行瞭閤閘空載變壓器的模擬計算。結果錶明,變壓器勵磁麯線的電壓不宜取得過低,變壓器剩磁宜取40%～50%。將所選取的變壓器勵磁麯線和剩磁運用到特高壓交流試驗示範工程擴建工程的閤空變研究中,併計算瞭從1 000kV側閤閘特高壓空載變壓器的過電壓和勵磁湧流。研究結果錶明,閤閘特高壓空載變壓器產生諧振過電壓的可能性比閤閘500kV變壓器大,長治站和荊門站特高壓空載變壓器閤閘均沒有齣現諧振過電壓,而南暘站閤閘第2檯特高壓變壓器時產生瞭標幺值〉1.3（基準值為（槡2×1 100/槡3）kV）的諧振過電壓,併且基本上不衰減;閤閘電阻可有效地抑製該諧振過電壓;閤閘時產生的勵磁湧流均不大。
위연구종1 000kV측합갑공재특고압（UHV）변압기적잠태특성,병학정기과전압화려자용류적폭치,종이위이후운행중합갑공재변압기적조작방식제공기술의거,수선장특고압교류시험시범공정계통조시시합공변과전압화려자용류적실측결과여모의계산결과진행료대비,병조출료합리적적변압기려자곡선화잉자취치이제고방진모형적준학성,재차기출상진행료합갑공재변압기적모의계산。결과표명,변압기려자곡선적전압불의취득과저,변압기잉자의취40%～50%。장소선취적변압기려자곡선화잉자운용도특고압교류시험시범공정확건공정적합공변연구중,병계산료종1 000kV측합갑특고압공재변압기적과전압화려자용류。연구결과표명,합갑특고압공재변압기산생해진과전압적가능성비합갑500kV변압기대,장치참화형문참특고압공재변압기합갑균몰유출현해진과전압,이남양참합갑제2태특고압변압기시산생료표요치〉1.3（기준치위（상2×1 100/상3）kV）적해진과전압,병차기본상불쇠감;합갑전조가유효지억제해해진과전압;합갑시산생적려자용류균불대。
In order to study transient characteristics of closing no-load ultra high voltage（UHV） transformer on the 1 000 kV side and to get the magnitude of overvoltage and inrush current,so as to provide technical basis for operation of closing no-load transformer,we compared actual measurement results with calculated results of UHV AC pilot project,and obtained reasonable transformer excitation curve and remnant magnetism value,which could improve accuracy of simulation model.Moreover,we simulated and computed the closing no-load transformer.Results indicated that voltage of excitation curve should not be low,and the remnant magnetism value should be chosen between 40%~50%.The chosen transformer excitation curve and remnant magnetism value were applied to the extension project of UHV AC pilot project,and the overvoltage and inrush current while closing no-load UHV transformer on the 1 000 kV side were calculated.Results showed that the probability of resonance overvoltage of closing UHV transformer was higher than that of 500 kV transformer,and there was no resonance overvoltage while closing UHV transformer in Changzhi or Jingmen Substation,however,the resonance overvoltage of per unit value was higher than 1.3（reference value（2×1 100/3） kV） while closing the second transformer at Nanyang substation.In addition,the closing resistor could effectively restrain resonance overvoltage,and the inrush current was small.
