解析电缆中产生噪音的原因有哪些？

解析电缆中产生噪音的原因有哪些？

1、介质本身内部分子摩擦；
1, the medium itself molecular friction;
   2、电缆电容的改变；
2, the cable capacitance change;
   3、电缆介质的压电效应；
Piezoelectric effect 3, cable dielectric;
   4、电缆中导体和介质摩擦产生电荷，即当导体和绝缘之间接触破坏时产生电荷的分离。  
The charge generating conductor and dielectric friction 4, cable, separation when the conductor and insulation between the contact damage produce charge.
   在聚乙烯绝缘表面挤上一层薄薄半导电（厚度0.20-0.30mm）的低噪音电缆得到了迅速的发展，其噪音值在2-3mV，对于工作在400度的低噪音电缆，可采用耐高温半导电纤维绕包的办法来解决，其噪音可达5mV。
In the polyethylene insulation surface squeeze on a thin layer of semi conductive (thickness 0.20-0.30mm) low noise cable obtained the rapid development, the noise value in 2-3mV, for the work in the 400 degree low noise cable, can use high temperature resistant semi conductive fiber winding package solution, the noise of up to 5mV.