| Title |
Countermeasures for Preventing Electric Shock in Low-Voltage Handhole |
| Authors |
김종민(Kim, Chong-Min) ; 한운기(Han, Woon-Ki) ; 방선배(Bang, Sun-Bae) ; 김한상(Kim, Han-Sang) |
| Keywords |
Low-voltage handholes ; Electric shock ; Ground potential ; Fault current ; FRP |
| Abstract |
This paper describes the countermeasures for preventing the electric shock which can be occurred in the low-voltage handhole underwater. Low-voltage handholes were designed and made for the test in the testing field. Which were installed 4 cases. a metal handhole cover was employed in case 1; FRP(Fiber glass Reinforced Plastic) handhole cover in case 2; an insulated rubber was put on the joint of the cables in case 3; the exposed conductors(cover, frame etc) were commoned and grounded in case 4. Thus, an ground potential near the low-voltage handhole was measured and evaluated quantitatively for the 4 cases. The measured results show that the potential of case 2.3 were lower than that of case 1 because the insulated rubber and the FRP cover prevented direct contact to the fault point. The case 4 is the lowest among the 4 cases because the common and grounding helps the fault current release into the ground, which makes the ground potential rise lower. As a result, although each case has the defects, these ways can effectively lower the electric shock risk in the low-voltage handhole. |