JINNAN春晨YCB扁电缆

江苏春晨电缆有限公司生产JINNAN春晨YCB扁电缆在作业人员脱离高电位时，即人与带电体分开并有一空气间隙时，相当于出现了电容器的两个极板，静电感应现象同时出现，电容器充电。当这一间隙小到使场强高到足以使空气发生游离时，带电体与人体之间又将发生放电，就会出现电弧和啪啪的放电声。所以每次移动作业位置时，若人体没有与带电体保持等电位的话，都会出现充电和放电的过程。当等电位作业人员靠近导线时，如果动作迟缓并与导线保持在空气间隙易被击穿的临界距离，那么空气绝缘时而击穿，时而恢复，就会发生电容C与系统之间的能量反复交换。这些能量部分转化为热能，有可能使导电手套的部分金属丝烧断，因此，进入等电位和脱离等电位都应动作迅速。等电位过渡的时间是非常短的，当人手与导线握紧之后，大约经过零点几微秒，冲击电流就衰减到最大值的1%以下，等电位进入稳态阶段。当人体与带电体等电位后，就好像鸟儿停落在单根导线上一样，即使人体有两点与该带电导线接触，由于两点之间的电压降很小，流过人体的电流是微安级的水平，人体无任何不适感。 When the operator is separated from the high potential, that is, when the person and the electrified body are separated and there is an air gap, it is equivalent to the appearance of two plates of the capacitor. The electrostatic induction phenomenon occurs at the same time, and the capacitor is charged. When the gap is small enough to make the field strong enough to make the air free, there will be a discharge between the charged body and the human body, and there will be an arc and a loud discharge sound. So every time when moving the working position, if the human body does not maintain the equipotential with the charged body, there will be a process of charging and discharging. When the equipotential operator approaches the conductor, if the action is slow and the conductor is kept at the critical distance that the air gap is easy to be broken down, the air insulation will break down sometimes and recover sometimes, and the energy exchange between the capacitance C and the system will occur repeatedly. Some of these energy can be converted into heat energy, which may cause some wires of conductive gloves to burn off. Therefore, the action of entering and disengaging equipotential should be rapid. The time of equipotential transition is very short. After the hand and the wire are clenched, the impact current will decay to less than 1% of the maximum value after a few microseconds, and the equipotential will enter the steady-state stage. When the human body and the electrified body are equipotential, it is like a bird stopping on a single wire. Even if two points of the human body are in contact with the electrified wire, because the voltage drop between the two points is very small, the current flowing through the human body is the level of microampere, and the human body has no discomfort. 例如：等电位作业时，当人体与带电体等电位后，假如两手（或两足）同时接触带电导线，JINNAN春晨YCB扁电缆且两手间的距离为1.0m，假如导线型号为LGJ —150/20，该段电阻为 0.00021Ω，当负荷电流为200A时，那么作用在人体上的电位差为0.042V，设人体 电阻为1000Ω，那么通过人体的电流为0.042mA，人体的感知电流是1mA，因此此时人体没有任何感觉。如若穿上全套屏蔽服，此电位差加在屏蔽服上，电流也经屏蔽服旁路流过，人体更无不适感。 For example: in equipotential operation, when the human body and the charged body are equipotential, if two hands (or two feet) contact the charged wire at the same time, and the distance between the two hands is 1.0m, if the wire model is lgj-150 / 20, the resistance of this section is 0.00021 Ω, when the load current is 200A, the potential difference acting on the human body is 0.042v, and the human body resistance is set as 1000 Ω, then the current passing through the human body At 0.042ma, the perceptual current of the human body is 1mA, so the human body does not feel anything at this time. If you put on a full set of shielding clothing, this potential difference is added to the shielding clothing, and the current also flows through the shielding clothing bypass, making the human body more comfortable.