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The difference between power cable and control cable

Issuing time:2018-11-09 11:06

Power cable, also known as "power cable", refers to a cable that transmits electrical energy. It is used to transmit and distribute large functional power in the main line of the power system. The rated voltage of the power cable is Uo/U (Uo refers to the metal conductor and metal sleeve or metal). The design voltage between shields, U refers to the design voltage between the metal conductor and the metal conductor), typically 0.6/1kV and above (220KV). Large current (large conductor cross section), fewer cable cores, 3 cores, 4 cores (three-phase four-wire system), 5 cores (three-phase five-wire system);

The control cable refers to a cable that transmits various control signals, and directly transfers power from the power distribution point of the power system to the power connection lines of various electrical equipment appliances. The control cable is mainly 450/750V, the current is relatively small (ie, the conductor cross section is small), the voltage range is narrow (450/750~10KV), the number of cable cores is more, from 2 cores to 61 cores, and even more.

When the power cable and control cable of the same specification are produced, the insulation and sheath thickness of the power cable are thicker than the control cable.

(1) The control cable is a cable for electrical equipment, and the power cable is two of the five major categories of cables.

(2) The standard for control cables is GB9330, and the standard for power cables is GB12706.

(3) The color of the insulated core of the control cable is generally black and white, and the low voltage of the power cable is generally separated.

(4) The cross section of the control cable generally does not exceed 10 square meters. The power cable is mainly for transmitting electricity, and generally has a large cross section.

Type of power cable

Representative model: VV/VLV/YJV, etc. 35kv and below XLPE insulated power cable

main application

35kv and below XLPE insulated power cables are suitable for fixed power transmission on power transmission and distribution lines with AC 50Hz and rated voltage of 35Kv and below. Compared with PVC power cables, this product not only has excellent electrical properties, mechanical properties, heat aging resistance, environmental stress resistance and chemical corrosion resistance, but also has a simple structure, light weight, and is not limited by the application drop. Long-term working temperature is high (90 degrees) and so on.

Executive standard

GB/T12706.1~12706.4-2002 "Rated voltage 1KV (Um = 1.2kV) 35k (Um = 40.5kV) extruded insulated power cable and accessories", can also be produced according to user needs, using the International Electrotechnical Commission IEC60502-1997 standard .

Use characteristics

1. The ambient temperature during cable laying is not lower than 0 °C, otherwise it must be preheated. The cable drop is not limited.

2. The minimum bending radius for cable laying is as follows:

Single core cable: 20 (d + D) ± 5%;

Three-core cable: 15 (d + D) ± 5%.

Control cable type

main application

PVC insulated and sheathed control cables are suitable for wiring, control, signal, protection and measurement systems with rated voltages up to and including 450/750V.

Production execution standard

GB9330 "Plastic Insulation Control Cable", IEC60227 "PVC insulated cable with rated voltage of 450/750V and below" and IEC60502 "Rated voltage 1-30KV extruded insulated power cable and accessories" and other standards.

Use characteristics

1. Power frequency rated voltage Uo/U (Uo refers to the design voltage between the metal conductor and the metal sleeve or metal shield, U refers to the design voltage between the metal conductor and the metal conductor.) is 450/750V or 0.6/1KV .

2. The long-term maximum operating temperature of the cable conductor is 70 °C.

3. When the cable is laid, the ambient temperature should not be lower than 0 °C. If the ambient temperature is lower than 0 °C, the cable should be preheated.

4. The recommended bending radius of the cable is as follows: No armored cable, no less than 6 times the outer diameter of the cable;