交流送電線における冠雪がいしの耐電圧特性

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  • Withstand Voltage Characteristics of Snow Covering Insulator Strings of AC Transmission Lines
  • コウリュウ ソウデンセン ニ オケル カンセツ ガイシ ノ タイ デンアツ ト

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In recent years, it is noticed that flashover faults of snow covered insulator string due to AC operating voltage or switching surge may occur in heavy snow areas.<br> AC, AC overvoltage, switching and lightning impulses flashover tests of strain insulator set artificially covered with snow were conducted in the Yonezawa testing station constructed in the northern part of Japan.<br> Withstand voltages of snow covered insulator set for high voltage AC transmission line have been investigated with the obtained test results.<br> The main points of the results are summarized as follows:<br> (1) The investigation of nature of snow on insulator sets shows that the specific gravity of snow is 0.3_??_0.4 and the conductivity of water melted from snow is maximum 40 μS/cm.<br> (2) Withstands voltages of insulator set covered with snow decreased as the specific gravity of snow increased.<br> (3) In the case of the specific gravity of 0.3_??_0.4, AC minimum withstand voltage per unit length was 74_??_79 kV/m.<br> (4) Switching impulse flashover voltage of snow covered insulator set with AC pre-stress was 10% lower than that without pre-stress. This is why snow condition is changed by leakage current under AC voltage application.<br> (5) It is clarified to make an insulation design for AC high voltage transmission line in heavy snow areas, on the basis of actual snow and meteorological conditions.

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