Technical conditions and equivalent circuit of intermediate potential operation

 

 

 

中間電位作業(yè)的技術(shù)條件

 

Technical conditions for intermediate potential operation

 

當(dāng)?shù)仉娢缓偷入娢蛔鳂I(yè)均不能滿足作業(yè)要求時(shí)，可采用中間電位作業(yè)法進(jìn)行作業(yè)，中間電位作業(yè)法是介于兩者之間的一種方法。它要求人體既要與帶電體保持一定距離，也要和大地（接地體）保持一定距離。此時(shí)人體的電位是介于地電位與帶 電體的高電位之間的某一個(gè)懸浮電位。

 

When the local potential and equipotential operation can not meet the operation requirements, the intermediate potential operation method can be used. The intermediate potential operation method is a method between the two. It requires the human body to keep a certain distance not only from the electrified body, but also from the earth (grounding body). At this time, the potential of the human body is a suspended potential between the ground potential and the high potential of the charged body.

 

 

 

中間電位作業(yè)法為接地體→絕緣體→人體→絕緣體→帶電體，人體通過兩部分絕緣體分別與接地體和帶電體隔開，由兩部分絕緣體限制流經(jīng)人體的電路，所以只要絕緣操作工具和絕緣平臺(tái)的絕緣水平滿足規(guī)定，由絕緣操作工具的絕緣電阻和絕緣平臺(tái)的絕緣電阻組成的絕緣體即可將泄漏電流限制到微安級(jí)水平。同時(shí)，兩段空氣間隙達(dá)到規(guī)定的作業(yè)間隙，由兩段空氣間隙組成的電容回路也可將通過人體的電容電流限制到微安級(jí)水平。中間電位作業(yè)就可以安全地進(jìn)行。由于人體電位高于地電位，體表場(chǎng)強(qiáng)也相對(duì)較高，應(yīng)采取相應(yīng)的電場(chǎng)防護(hù)措施，以防止人體產(chǎn)生不適。

 

The intermediate potential operation method is grounding body → insulator → human body → insulator → electrified body. The human body is separated from the grounding body and electrified body respectively through two parts of insulators, and the circuit flowing through the human body is limited by two parts of insulators. Therefore, as long as the insulation level of the insulating operation tool and the insulating platform meets the requirements, it is composed of the insulation resistance of the insulating operation tool and the insulation resistance of the insulating platform The leakage current can be limited to microampere level. At the same time, the gap between two sections of air reaches the specified working gap, and the capacitance circuit composed of two sections of air gap can also limit the capacitance current passing through the human body to the level of microampere. Intermediate potential operation can be carried out safely. Because the potential of human body is higher than the ground potential, and the electric field strength of the body surface is also relatively high, corresponding electric field protection measures should be taken to prevent discomfort of human body.