1986 Fiscal Year Final Research Report Summary
DETERIORATION OF <Z_nO> TYPE DISTRIBUTION ARRESTER DUE TO THE CONTINUOUS HIGH FREQUENCY ABNORMAL VOLTAGE.
| Project/Area Number |
60550205
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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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 | TOYOHASHI UNIVERSITY OF TECHNOLOGY |
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Principal Investigator |
SAKAKIBARA TATEKI TOYOHASHI UNI. OF TECH., PROFESSOR, 工学部, 助教授 (10023243)
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| Project Period (FY) |
1985 – 1986
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| Keywords | CV CABLE FAULT / INTERMITTENT ARC / TRANSIENT OVERVOLTAGE / CONTINUOUS OVERVOLTAGE / 定常異常電圧 / 中性点接地抵抗 |
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| Research Abstract |
IN THIS RESEARCH, WE HAVE POINTED OUT THAT THE 6.6 kV CV CABLE SYSTEM BEHACES DIFFERENTLY FROM THE OVERHEAD SYSTEM UNDER THE ONE-LINE GROUND FAULT. THIS IS THE CASE BECAUSE THE 6.6 kV SYSTEM IS A CAPACITIVE CIRCUIT AND THERMAL DISINTEFRATION OF POLYETHYLENE AT THE FAULT POINT PRODUCES A VIGOROUSLY EJECTING ORGANIC GAS, WHICH HAS GREAT EFFECT ON THE ARC BEHAVIOR AT THE FAULT POINT. THUS THE FAULT ARC BECOMES AN INTERMITTENT ARC WHICH PRODUCES A COMPLICATED OVERVOLTAGE.
THIS RESEARCH HAS ANALYZED THE EFFECT OF INTERMITTENT ARC BY BOTH EXPERIMENTAL AND SIMULATION METHODS. THE TRANSIENT OVERVOLTAGE OF 6.6 kV NO-INSULATED NEUTRAL SYSTEM REACHES 3 pu. JUST AFTER THE FAULT OCCURRENCE AND THE STEADY-STATE OVERVOLTAGE REACHES 2.0 pu. TO SUPPRESS THEM BELOW 2 pu, IT IS NECESSARY TO GROUND THE NEUTRAL WITH A RESISTANCE OF LESS THAN 50 ohm.
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