Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 28, Issue 4, Pages 2550-2557Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2013.2267781
Keywords
Breakdown characteristic; cable length; capacitive voltage divider; full bandwidth measurement of VFTO; impedance converter; overvoltage coefficient; peak value of VFTO; trapped charge voltage; ultra-high voltage gas-insulated switchgear
Categories
Funding
- National Basic Research Program of China (973 Program) [2011CB209405]
- Science and Technology Project of SGCC [SGKJJSKF[2009]776]
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In order to study the characteristics of very fast transient overvoltage (VFTO) in ultra-high voltage (UHV) gas-insulated switchgear (GIS), the authors have developed a full frequency bandwidth measurement system based on a port-hole-type capacitive voltage divider. Three kinds of measurement circuits for the measurement system are studied and the influence of cable length on measurement results is analyzed in this paper. The calibration of the measurement system using step response was conducted. The results show that the measurement system of teh capacitive voltage divider integrated with an impedance converter has a bandwidth ranging from 0.003 Hz to 300 MHz at least. It can be used to measure the full VFTO during DS operation perfectly. A full-scale UHV DS (disconnect switchgear) is used to establish the test circuit. The measurement system with good anti-electromagnetic interference ability was constructed. Four different measurement locations are chosen on which to install the measurement system. An approximate total of 3000 closing and opening operation tests were conducted. Due to the wide frequency band of the measurement system, it is possible to obtain the full VFTO waveform accurately and conveniently. According to the waveforms, the key parameters of VFTO, such as trapped charge voltage, peak value of VFTO, breakdown characteristic of DS, frequency spectrum of transient waveform, and the overvoltage coefficient could be obtained.
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