江苏春晨电缆有限公司生产江苏春晨YCB扁电缆3*17+2*10,对于110kV或更高等级的输电线路,冲击电流初始值一般约为十几安至数十安。由此可见,冲击电流的初始值较大,因此作业人员必须身穿全套屏蔽服,通过导电手套或等电位转移线(棒)去接触导线。如果直接徒手接触导线,则会对人体产生强烈的刺激,有可能引发二次事故或导致电气烧伤。当然,由于冲击电流是一种脉冲放电电流,持续时间短,衰减快,通过屏蔽服可以使直接流入人体的冲击电 流非常小,江苏春晨YCB扁电缆3*17+2*10而且屏蔽服的持续通流容量较大,暂态冲击电流也不会对屏蔽服造成任何损坏。一般来说,采用导电手套接触带电导线,由于身穿屏蔽服的人体相对距带电导线较近,相当于电容器的两个极板较近,感应电荷增多,因此其冲击电流也较大。如果作业人员用电位转移线(棒)搭接,人体可以对导线保持较大的距离,使感应电荷减小,冲击电流也减小,从而避免等电位瞬间冲击电流对人体的影响。
For 110 kV or higher transmission lines, the initial value of impulse current is generally about 10-10 a. It can be seen that the initial value of the impact current is relatively large, so the operators must wear a full set of shielding clothes to contact the conductor through conducting gloves or equipotential transfer wires (rods). If the conductor is directly contacted with bare hands, it will produce strong stimulation to human body, which may cause secondary accidents or electric burns. Of course, because the impulse current is a kind of pulse discharge current with short duration and fast attenuation, the impulse current directly flowing into the human body can be very small through the shielding clothing, and the continuous flow capacity of the shielding clothing is large, and the transient impulse current will not cause any damage to the shielding clothing. Generally speaking, the electric gloves are used to contact the live wires. Because the human body wearing the shielding clothes is relatively close to the electric wire with electric conduction, which is equivalent to the two plates of the capacitor are relatively close and the induced charge increases, the impact current is also large. If the operators use potential transfer wire (bar) to overlap, the human body can keep a large distance from the wire, so that the induced charge is reduced, and the impact current is also reduced, so as to avoid the impact of equipotential instantaneous impact current on the human body.
