Measures to prevent or reduce electrical interference mainly include the following three aspects.
1. A spare core of the control cable is grounded
Practice has proved that when a backup core in the control cable is grounded, the amplitude of the interference voltage can be reduced to 25% to 50%, and the implementation is simple, and the cost of the cable is increased only slightly.
2. Circuits with serious consequences for electrical interference do not use a control cable
These include:
(1) weak signal control loop and strong signal control loop;
(2) The loop of low level signal and high level signal;
(3) The same control cable should not be used for weak phase control loops of AC circuit breaker phases. However, for each pair of return conductors of the weak current loop belonging to control cables that are not of the same root, it may form a ring arrangement when laid, and the potential may be induced under the electromagnet wires of similar power supply, and the value may be for weak current loops. Low-level parameter interference has a greater impact, so it is advisable to use a single control cable for the return conductors.
3. Metal shield and shield ground
Metal shielding is an important measure to reduce and prevent electrical interference, including total shielding, sub-shielding and double-layer total shielding of the core. The selection of the metal shield type of the control cable shall be based on the possible influence of the electrical interference, and shall include measures for comprehensive suppression of interference to meet the requirements for reducing interference and overvoltage. The higher the requirement for anti-jamming effect, the greater the corresponding investment. When using steel tape armoring and steel wire braiding total shielding, the price of the cable is increased by about 10%~20%.
The control interference in the strong electric circuit, due to its strong signal, can be controlled by a control cable without metal shield, except in the UHV power distribution device or in parallel with the high voltage cable. The control cable used for the control circuit of the weak current signal, when located in an environment where there is interference, and does not have effective anti-jamming measures, the control cable with metal shield should be used to prevent the electrical interference from the low level signal.
Circuit malfunction or insulation breakdown. If the control cable of the weak current circuit can be pulled away from the power cable for a sufficient distance or laid in a steel pipe, the external electrical interference may be reduced to an allowable limit.
For the control cable of the computer monitoring system signal loop, the principle of shielding type selection is:
(1) Switch signal, total shield available;
(2) High-level analog signals, it is appropriate to use the total shield of the core, if necessary, can also be used for the sub-shielding of the core;
(3) For low-level analog signals or pulse signals, it is advisable to use separate shields for the core, and if necessary, a composite total shield with separate shields for the cores.
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