Along with the development of the industrial society, as the transportation of water which is the indirect capital of society and petroleum, gas, etc used as energy sources is rapidly increased. the underground material is being expanded. Like this, the pipes laid under the ground not only bring the...
Along with the development of the industrial society, as the transportation of water which is the indirect capital of society and petroleum, gas, etc used as energy sources is rapidly increased. the underground material is being expanded. Like this, the pipes laid under the ground not only bring the corrosion to the land circumstances to reduce the life of the pipes, but also raise the social problem of leakage accidents and the economic loss by Pin Hole. By reason of this, for the purpose of protecting the corrosion of the underground material, we are constructing and operating the electrolytic protection facilities. In case of a region of which specific resistance is high, however, we are not keeping proper protection potential(that is -850mV) to get protection effects. In this study, for the water pipes that under-voltage phenomena occur in the protection potential, we made a spot survey on the under-voltage section and normal-voltage section, compared, analyzed each of the contents and examined the under-voltage causes of the protection potential.
Along with the development of the industrial society, as the transportation of water which is the indirect capital of society and petroleum, gas, etc used as energy sources is rapidly increased. the underground material is being expanded. Like this, the pipes laid under the ground not only bring the corrosion to the land circumstances to reduce the life of the pipes, but also raise the social problem of leakage accidents and the economic loss by Pin Hole. By reason of this, for the purpose of protecting the corrosion of the underground material, we are constructing and operating the electrolytic protection facilities. In case of a region of which specific resistance is high, however, we are not keeping proper protection potential(that is -850mV) to get protection effects. In this study, for the water pipes that under-voltage phenomena occur in the protection potential, we made a spot survey on the under-voltage section and normal-voltage section, compared, analyzed each of the contents and examined the under-voltage causes of the protection potential.
이때 접지저항 측정방법은 국제규격[4] (IEEE std-80) 에서 제시하는 전압강하법을 적용하였으며, 전류귀로전극(C2)은 양극 매설깊이 50m의 5배 이상을 유지하기 위하여 250m 이격하였다. 양극매설은 그림 2.
성능/효과
(2) 불량개소 R1의 경우, 양극매설부분이 암반 지대로 대지비 저항이 높고, 강관과 대지와의 접촉저항이 상대적으로 높다. 또한 지하수맥이 있을 경우 백필의 유실로 인하여 양극 사이에 공극이 발생함으로 접지저항이 높아진다.
(3) 이상의 내용을 종합해 볼 때 외부전원법의 전기방식 적용현장에서, 출력전류를 원활히 방출하지 못하여발생되는 방식전위 부족현상은, 양극의 접지저항이 높아서 일어나는 것으로 분석된다. 따라서 방식효율을 극대화하기 위하여, 양극 매설부지와 배관 매설부지의 낮은 대지비 저항이 요구된다.
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