Measures to Prevent Interference of Control Cables
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.
The above content is explained, want to know moreYanggu cable, wire and cableThe relevant content can pay attention to us.
What are the main points of purchasing wires and cables? Let's take a look. As the main carrier of power transmission, wire and cable are widely used in electrical equipment, lighting circuits, household appliances, etc. Its quality directly affects the quality of the project and the safety of consumers' lives and property. There are many wire varieties on the market, and appropriate wires should be used according to their own power load.
What are the precautions for wires and cables? Let's take a look. Common cable faults: wire surface markings-according to national standards, the wire surface should have continuous markings of the manufacturer's name, product model and rated voltage. This helps to find the manufacturing plant in time when there is a problem during the use of the wire, and consumers should pay attention to this when buying the wire.
There are many kinds of wire and cable products for electrical equipment on the market, which are difficult for ordinary consumers to distinguish. So what are the main categories of wire and cable products? What are the product naming principles of wire and cable? The editor brings you a brief understanding of relevant content knowledge.
The wires and cables for electrical equipment are mainly used for internal or external connection of electrical equipment, low-voltage transmission lines and various electrical signal transmission lines. Generally speaking, except for power cables, communication cables and magnet wires, most insulated wires and cables are classified as wires and cables for electrical equipment.
Electrical equipment with wire and cable is a large class of wire and cable products, a wide range of applications, many varieties, many series, large output, process type complex. The rated voltage of wires and cables for electrical equipment is low, and the working voltage is 450/750v and below, which is not more than 0.6/1kv. The working voltage of signal and instrument cables is usually 300/500v and below. The ampacity of the cable is determined according to the requirements of the cable.
Low voltage power cable winter pay attention to matters? As the weather gets colder and colder, manufacturers of low-voltage power cables usually become more difficult, which brings inconvenience to construction. Here are some precautions for winter construction. Let us take a brief look.