In the electric power industry, high-voltage through-wall bushing is a common component. For example, when the power line enters and leaves the substation or distribution station, the high-voltage through-wall bushing will pass through the wall, so as to effectively and safely isolate the indoor and outdoor of the substation or distribution station. This paper mainly introduces how to connect high - pressure wall - through casing shielding line.
As we know, shielding wire is the use of metal mesh braid layer to wrap up the signal line line, red copper or tinned copper and other materials, its main role is to reduce the influence of external electromagnetic field on the line, the higher the frequency of the line signal, the easier it is to radiate out, using shielding wire can also effectively prevent the line from radiating electromagnetic energy. The shielding layer of the shielding wire needs to be grounded, and external interference signals can be imported into the earth by the shielding layer.
The covering conductor is called the shield layer, which is generally conductive cloth. It is braided copper mesh or copper (aluminum) platinum material. The shield layer generally needs to be grounded.
High pressure wall threading shield cable connection
1. Both ends are grounded simultaneously
It can shield radio frequency signal well, but it is easy to be affected by ground loop current. It has good grounding shielding effect at both ends and can be used for anti-static induction.
2. One end is grounded and the other end is suspended
Because the ground resistance at both ends is different, the potential of the two ground points may be different. The method of grounding one point and hanging the other end can avoid the formation of current interference.
3. The transmitting end is grounded, and the receiving end is grounded through the capacitor
If the capacitor is of the right type and in the right position, the RF signal can be well shielded without low frequency backflow.
If you use pulse control servo motor, stepping motor, remember to be sure to connect the high voltage through the wall sleeve shielding wire, otherwise the interference will be very serious.
