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Measurement and Analysis of Very Fast Transient Overvoltage (VFTO) Induced by Operating Disconnector in 1000kV GIS
Author: XuJun
Tutor: LiChengZuo
School: North China Electric Power University (Beijing)
Course: High Voltage and Insulation Technology
Keywords: VFTO 1000kV UHV GIS Hand window sensor Statistical analysis
CLC: TM595
Type: Master's thesis
Year: 2011
Downloads: 134
Quote: 0
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Abstract
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National Grid UHV GIS test platform , nearly isolation switch open and close the field test . Hand window sensors measured in multiple locations UHV GIS of UHV GIS within the process of opening and closing VFTO characteristics the UHV VFTO waveform characteristics , distribution characteristics and VFTO of the maximum level . The measurement results show that : the Opening and Closing Resistor isolation switch VFTO inhibited , the resistor isolation switch with Opening and Closing maximum VFTO for 1.33pu not with Opening and Closing The the resistor isolation switch maximum VFTO of 2.31 pu . With Opening and Closing resistance isolation switch voltage steepness of about 3.75kV/ns, and not with Opening and Closing the resistor isolation switch maximum voltage steepness of about 50kV/ns . The voltage distribution GIS short bus and branch busbar end VFTO highest , AC power supply casing below the position VFTO minimum . The isolation switch action speed has a certain impact on VFTO , that is, the slower the speed , the lower sub-gate last residual voltage . These test results reveal VFTO distribution characteristics for to obtain of UHV GIS isolation switch during operation generated VFTO level , provides an important basis for simulation and field operations .
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CLC: > Industrial Technology > Electrotechnical > Electrical > Electrical equipment > Enclosed Switchgear
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