电气技术
電氣技術
전기기술
ELECTRICAL ENGINEERING
2011年
8期
50-52
,共3页
可调电抗%电容电流测量%谐振频率%恒频电流信号%PSCAD/EMTDC仿真%实验
可調電抗%電容電流測量%諧振頻率%恆頻電流信號%PSCAD/EMTDC倣真%實驗
가조전항%전용전류측량%해진빈솔%항빈전류신호%PSCAD/EMTDC방진%실험
adjustable reactor%capacitance current measurement%resonance frequency%current signal with constant frequency%PSCAD/EMTDC simulation%experiment
在非有效接地电力系统的保护与控制中,电容电流是一项重要的参数。本文介绍一种测量电容电流的新方法——谐振测量法。消弧线圈内置电压互感器的低压侧注入一恒频的电流信号,并串联一可调电抗,根据谐振原理可以获得系统的谐振频率。通过调节电抗值,又可获得另一谐振频率。用两次获得的谐振频率,可以准确计算电网的电容电流。用PSCAD/EMTDC仿真软件搭建模型进行仿真和模拟实验,结果表明此方法在电容电流检测中的有效性、可行性。
在非有效接地電力繫統的保護與控製中,電容電流是一項重要的參數。本文介紹一種測量電容電流的新方法——諧振測量法。消弧線圈內置電壓互感器的低壓側註入一恆頻的電流信號,併串聯一可調電抗,根據諧振原理可以穫得繫統的諧振頻率。通過調節電抗值,又可穫得另一諧振頻率。用兩次穫得的諧振頻率,可以準確計算電網的電容電流。用PSCAD/EMTDC倣真軟件搭建模型進行倣真和模擬實驗,結果錶明此方法在電容電流檢測中的有效性、可行性。
재비유효접지전력계통적보호여공제중,전용전류시일항중요적삼수。본문개소일충측량전용전류적신방법——해진측량법。소호선권내치전압호감기적저압측주입일항빈적전류신호,병천련일가조전항,근거해진원리가이획득계통적해진빈솔。통과조절전항치,우가획득령일해진빈솔。용량차획득적해진빈솔,가이준학계산전망적전용전류。용PSCAD/EMTDC방진연건탑건모형진행방진화모의실험,결과표명차방법재전용전류검측중적유효성、가행성。
Capacitance currents is an important parameter for protection and control in effectively earthed power systems.A novel method——resonance measurement for the cpacitance current measurement is preasented in the paper.An adjustable reactor is in series connection with the low voltage side of voltage transformer in arc suppression coil.System resonance frequency is sought by injecting a current signal with constant frequency.By changing the reactor inductance value,another resonance frequency can also be sought.The ground capacitance current can thus be calculated using the two resonance frequencies for the power systems.The PSCAD/EMTDC emulator is utilized to simulation and experiment,The measurement results from simulation tests are used to prove the feasibility and the validity of such method in capacitance current detection.
