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Study on GIS Enclosure Circulating Currents and Transient Grounding Potential Rise

Author: ChenZuo
Tutor: ZhangXiaoQing
School: Beijing Jiaotong University
Course: High Voltage and Insulation Technology
Keywords: VFTO GIS GIS shell circulation Transient Ground Potential Rise PSCAD Equivalent circuit model
CLC: TM862
Type: Master's thesis
Year: 2011
Downloads: 124
Quote: 0
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Abstract


In recent years, gas-insulated substations (GIS) to the structure of compact, small size, small footprint, reliable operation, less maintenance, less environmental pollution, has been more widely used in the power system. But precisely because of its compact structure, isolation switches, circuit breakers and other switching equipment operation can easily produce oscillation frequency up to tens or even hundreds of megabytes of special fast transient overvoltage, and found through research, VFTO produce, often can trigger the GIS shell circulation and transient ground potential rise phenomenon, resulting in a significant loss. Bus parameters calculated deduced impedance formula and bus simulation using finite element simulation software Ansoft maxmell 2D to draw finite element calculations and impedance formula to calculate the accuracy of the results of comparison testing formulas; join grounding device modeling, GIS shell, while analysis of distributed parameter effects of the grounding device; GIS basic circuit using power system transient analysis software PSCAD / EMTDC line VFTO influencing factors were analyzed and presented some VFTO prevention and resolution measures. PSCAD / EMTDC software simulation model, consider the effect of GIS grounding device distribution parameters and analog isolation switch the GIS shell circulation circuit breaker operation, this paper directly to VFTO voltage wave introduced model analysis of GIS circulation was out of circulation waveform, then with the test data were compared. Selection of approximate analytical method to study transient ground potential rise in PSCAD / EMTDC establish the GIS shell potential calculation model to analyze the transient ground potential rise in line voltage transient ground potential rise, PSCAD / EMTDC basic modeling and simulation data with test match, in order to verify the correctness of the model; to consider grounding device position on the impact of transient ground potential rise, draw grounding device away from qualifying sets closer, the docking location as well as the points transient ground potential rise was inhibited, the better; installation of capacitors, research capacitance value line transient ground potential rise across the insulating flange; installation of metal oxide surge arresters at the insulating flange, compare insulating flange between the installation of some of the characteristics of metal oxide surge arresters and metal arresters installed in the inhibitory effect of transient ground potential rise between the insulating flange obtained transient ground potential rise. Select a 500kV hydropower GIS system as the object of analysis PSCAD / EMTDC software modeling research in GIS the key node VFTO voltage, and over-voltage statistics obtained statistics overvoltage; then on the GIS system shell circulation, calculated results with the experimental data control; study transient ground potential rise in the GIS system transient ground potential rise voltage waveform consistent calculation results with the experimental data, verify that the model is calculated in the model created by the correctness and validity.

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > Overvoltage and Its Protection > Over-voltage protection devices
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