Measures to Prevent Interference of Control Cables

Release time:

2021-04-21 09:19

Control cableMeasures to prevent or mitigate electrical interference mainly include the following three aspects.
1. A spare core wire of the control cable is grounded:
Practice has proved that when a spare core wire of the control cable is grounded, the amplitude of the interference voltage can be reduced to 25% ~ 50%, which is simple to implement, but the cable cost does not increase much.


2. When electrical interference occurs, the control cable is not suitable for circuits with serious consequences:
Including:(1) weak current signal control circuit and strong signal control circuit;(2) low level signal and high level signal loop;(3) in the split phase operation, each phase weak current control circuit of AC circuit breaker should not use the same control cable. However, if each pair of round-trip conductors in the weak current circuit belong to different control cables, a circular arrangement may be formed during laying, and a potential will be induced under the cross-linking of electromagnetic wires similar to the power supply. Its value may have a great impact on the low-level parameter interference of the weak current circuit, so it is recommended to share a control cable for the round-trip conductors.
3. Grounding of metal shield and shielding layer
Yanggu Cable FactoryRemind you that metal shielding is an important measure to reduce and prevent electrical interference, including full shielding of wire cores, partial shielding and double-layer full shielding. The selection of the metal shield type of the control cable should be based on the possible electrical interference effects and incorporate comprehensive interference suppression measures to meet the requirements of reducing interference and overvoltage. The higher the anti-interference effect requirements, the greater the corresponding investment. When the steel tape armor and steel wire braid total shield, the cable price will increase by about 10% to 20%.
The control interference in the high-voltage circuit can choose the control cable without metal shielding because of its strong signal, except for those located in the ultra-high voltage power distribution device or close to the high-voltage cable for a long time and parallel to it. When the control cable used in the weak current signal control circuit is located in an interference environment and there is no effective anti-interference measures, the control cable with metal shielding should be selected to prevent electrical interference from causing misoperation or insulation breakdown of the low-level signal circuit. If the control cable of the weak current line can be fully separated from the power cable, or laid in the steel pipe, the external electrical interference can be reduced to the allowable limit.
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