| Project/Area Number |
58850050
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
電力工学
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
1983 – 1985
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| Project Status |
Completed (Fiscal Year 1985)
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| Budget Amount *help |
¥8,900,000 (Direct Cost: ¥8,900,000)
Fiscal Year 1984: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1983: ¥3,900,000 (Direct Cost: ¥3,900,000)
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| Keywords | Gas Insulated Cubicle / Gas Insulated Switchgear / Gas Insulation / <SF_6> / Air / <SF_6> and Air Gas Mixtures / Breakdown Voltage / 絶縁破壊特性 |
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| Research Abstract |
<SF_6> gas is being used in gas-insulated substations (GIS) at pressures of a few atmosphere. Since the regular pressure of GIS is high (a few atmospheres), rather expensive pressure vessels are required, and this fact prevents <SF_6> gas insulation from being widely used for insulation at low rated voltages. The advent of gasinsulated cubicle (GIC) has made it possible to widen application of <SF_6> gas insulation to low rated voltage area. The purpose of the present study is to make clear the insulation condition of GIC with which <SF_6> and air gas mixtures may be used at near-atmospheric pressures. The results obtained may be summarized as below.
1) The effective ionization coefficient, which is the most important fundamental parameter for prediction and simulation of breakdown in gases, of <SF_6> and air has been measured for E/p up to 2,000 V <cm^(-1)> <Torr^(-1)> and summarized in a form of experimental formula.
2) The breakdown voltage of <SF_6> and air mixtures in uniform fields has been measured to show that the voltage assume maximum values at an <SF_6> percentage pressure of about 90%.
3) Interpreting comprehensively the results obtained in the present study, use of about 80 to 100% percentage <SF_6> pressure may be recommended for use for GIC.
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