Control cables are suitable for PVC insulated, PVC sheathed control cables used in electrical instrumentation connecting lines with AC rated voltages of 450 / 750V and below, transmission lines for automatic control systems, and protection lines. These sheaths and insulation materials have excellent characteristics such as corrosion resistance, acid and alkali resistance, abrasion resistance, oil resistance, aging resistance, flame resistance, water resistance, etc., and are often suitable for metallurgy, power, petrochemical and other industries.
Therefore, the control cable has the characteristics of anti-moisture, anti-corrosion and abrasion resistance. It is often constructed and installed in cable tunnels or cable trenches.
Power cables are often used in power systems as the backbone for transmitting and distributing large amounts of electrical energy, and control cables transmit electrical energy directly from power distribution points in power systems to the power connection lines of various electrical equipment.
The rated voltages of commonly used power cables and control cables are 0.6 / 1KV and 450 / 750V, respectively. Because the rated cables applicable to the two types of cables are different, when the same specifications of power cables and control cables are manufactured, the thickness of the insulation and sheath of the power cables is thicker than that of the control cables.
Maintenance of control cable lines
1. The control cable price formula is as follows: copper weight X copper price = (wire diameter ÷ 2) ^ 2X3.14X number of wires X8.9X copper price + 10% processing fee at that time.
2. Cost and price calculation of control cables.
3, square X1.83 = weight of copper X copper price at that time + armored price (weight X0.4 yuan / kg) = cost price + 10% processing fees.
4. The price of the cable = cost of manufacturing materials + fixed costs + taxes + business fees + profit.
5. Fixed costs vary according to the situation of each company, and generally include production wages, management wages, utilities, repair costs, depreciation costs, rents, and transportation costs.
6, manufacturing material cost = material cost * (1 + material consumption) (material cost is the theoretically calculated value).
7. Common failures of control cable lines include mechanical damage, insulation damage, insulation moisture, insulation deterioration, overvoltage, and cable overheating failures. If these faults occur on the line, immediately disconnect the power supply of the cable, detect and locate the fault point, and then perform repairs and tests. After the fault is eliminated, the power can be restored.
Preventive measures: In order to ensure that the control cable has a reduced range when insulation breakdown, mechanical damage or fire occurs, dual protection of current and voltage, and two systems that require enhanced reliability, such as DC power and trip control circuits, should be used. Separate control cables.