Basic Study on a Measurement Method of Transient Voltage Traveling along Power Line Systems Consisting of Two Overheadlines

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  • 架空二線から成る送配電系統を伝搬する過渡電圧の一測定法の基礎的検討
  • 架空2線から成る送配電系統を伝搬する過渡電圧の一測定法の基礎的検討
  • カクウ 2セン カラ ナル ソウハイデン ケイトウ オ デンパンスル カト デ

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The transient voltage due to lightning and the operations of breakers, disconnenctors, and switches travels along the power line as a traveling wave, and causes destruction of electronic devices and malfunction of communication and control system in substations. It is important to measure exactly the wave traveling along the power line, but the measurement is very difficult, because the voltage is very high and the transient waveforms are complicated extermely on account of reflections at insulators and junctions.<br>In this paper, a distributed constant system was introduced in consideration of the fast transients. A method was proposed, which derives the waveforms of the transient voltage traveling along the power line from the response of a single-wire line run paralell with the power line. In order to verify the method, an experimental system was introduced, which consisted of a battery with internal emf 67.5 V, a switch, a coaxial cable as a distributed constant line, and a single-wire line above a ground plane as a main line. The transient traveling waves due to the switch on closure are measured by coupling an auxiliary (another single-wire line above a ground) to the main line. The experimental and theoritical results agree very well. This method has the advantages that the transients can be measured out of contact with a power line and that forward-traveling wave can be separated from backward-traveling wave.

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