电气技术
電氣技術
전기기술
ELECTRICAL ENGINEERING
2012年
10期
20-23
,共4页
电子式电流互感器%激光供能%光纤%A/D转换
電子式電流互感器%激光供能%光纖%A/D轉換
전자식전류호감기%격광공능%광섬%A/D전환
Electronic current transformer (ECT)%laser powered%optical fiber%analog to digital convert
针对传统电流互感器测量小电流精度低、线性度差、绝缘结构复杂、容易磁饱和等缺点，研制了一套用于测量变压器接地电阻电流的电子式电流互感器，能够在较大电流范围内保证极高的测量精度。采用激光供电的方式，利用霍尔传感器作为传感头，经过信号调理、A／D转换、电光转换，由光纤将一次电流信息传输到低电位端进行信号处理。测试结果表明，设计的电子式电流互感器符合GB／T20840．8—2007要求，满足电力系统测量准确度0．2级和保护准确度5P的要求。
針對傳統電流互感器測量小電流精度低、線性度差、絕緣結構複雜、容易磁飽和等缺點，研製瞭一套用于測量變壓器接地電阻電流的電子式電流互感器，能夠在較大電流範圍內保證極高的測量精度。採用激光供電的方式，利用霍爾傳感器作為傳感頭，經過信號調理、A／D轉換、電光轉換，由光纖將一次電流信息傳輸到低電位耑進行信號處理。測試結果錶明，設計的電子式電流互感器符閤GB／T20840．8—2007要求，滿足電力繫統測量準確度0．2級和保護準確度5P的要求。
침대전통전류호감기측량소전류정도저、선성도차、절연결구복잡、용역자포화등결점，연제료일투용우측량변압기접지전조전류적전자식전류호감기，능구재교대전류범위내보증겁고적측량정도。채용격광공전적방식，이용곽이전감기작위전감두，경과신호조리、A／D전환、전광전환，유광섬장일차전류신식전수도저전위단진행신호처리。측시결과표명，설계적전자식전류호감기부합GB／T20840．8—2007요구，만족전력계통측량준학도0．2급화보호준학도5P적요구。
A kind of electronic current transformer for measuring the current flowing through power transformers' ground resistance of is designed to overcome the disadvantage of low accurancy, linearity sent, complex insulation structure, easily magnetic saturated existing in traditional current transformers. It has a high accurancy over a wide current range. The high voltage side is laser powered and Hallelement is used for sensing, signal of primary current is transmitted to low voltage side to process after modulation, analog to digital converting and electrical to optical converting. The accuracy test results showed that the transformer could satisfy the requirement of GB/T 20840.8-2007 and the measurement accurancy could reach class 0.2/5E
