An electronic voltage transformer online calibration system
A voltage transformer and electronic technology, applied in the field of electronic voltage transformer on-line verification system, can solve the problems of dangerous live operation, large size of equipment, heavy weight, etc., to ensure accuracy, strong mobility, and insulation. Simple and reliable effects
Active Publication Date: 2018-05-29
宜昌昌耀电力成套设备有限公司
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Problems solved by technology
However, since the standard transformer adopts the traditional electromagnetic voltage transformer, ferromagnetic resonance may be generated when the live power is connected to the power grid, which brings danger to the live operation
And when the voltage level is high, the equipment is bulky and heavy, which is not conducive to field use
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[0023] Such as Figure 1~Figure 3 As shown, an electronic voltage transformer online calibration system includes four parts: a voltage sensing unit 1 , a signal conversion unit 2 , a signal transmission unit 3 and a calibration platform 4 . The voltage sensing unit 1 is used to obtain a primary voltage signal online, and its output is used as a standard voltage signal. After receiving the synchronization signal sent by the verification platform 4 , the signal conversion unit 2 converts the analog signal of the voltage sensing unit 1 into a digital signal, and transmits it to the subsequent verification platform 4 through the signal transmission unit 3 . The calibration platform 4 simultaneously receives the data of the voltage sensing unit 1 and the voltage transformer to be calibrated, and completes the analysis, processing and error comparison of the two channels of data. The voltage sensing unit 1 and the signal conversion unit 2 are placed in the shielding device 7 . The...
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An electronic voltage transformer online calibration system, including a voltage sensing unit, a signal conversion unit, a signal transmission unit, and a calibration platform. The voltage sensing unit is used to obtain a primary voltage signal online, and its output is used as a standard signal. After processing by the conversion unit, it is transmitted to the verification platform through the signal transmission unit. The invention provides an electronic voltage transformer online calibration system, which adopts a ring-shaped electric field sensing array as a voltage sensing unit, and can acquire a voltage signal without interruption of power supply. The voltage sensing unit does not need to be directly connected to the primary wire, but obtains the primary voltage signal in the form of electromagnetic induction, so it will not affect the normal operation of the line, and there is no problem of ferromagnetic resonance.
Description
technical field [0001] The invention relates to an electronic voltage transformer online calibration system, which relates to the field of power system measurement. Background technique [0002] The development of smart grid and the large number of smart substations put into operation have put forward higher and higher requirements for the corresponding measurement technology. Due to the shortcomings of ferromagnetic resonance, poor transient characteristics, large volume, and heavy weight, traditional transformers cannot meet the requirements of modern power systems, and because the output of traditional transformers is analog, the output of voltage transformers is generally 100V / 57.7V , while the current transformer output is 5A / 1A, these analog output forms cannot meet the development direction of measurement and protection digitization. Therefore, electronic transformers based on new sensing principles have been more and more used in smart substations. Electronic trans...
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IPC IPC(8): G01R35/02
Inventor 李振华李秋惠胡蔚中黄悦华李振兴徐艳春
Owner 宜昌昌耀电力成套设备有限公司