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Frequency converter cable and cable difference

Information Source:Henan Huadong Cable Co., Ltd Release date:2014-03-31

1 cable symmetry design
For the 1.8/3KW and the frequency conversion motor cable, and symmetric 3+1 core and 4 core cable can only be used for the input cable main power, but it is best to use the symmetric structure of cable. Frequency converter and frequency conversion motor asked cables are to be symmetrical cable structure, symmetrical cable structure has 3 core and 3+3 core two, 3+3 core cable structure is the three of a small four core insulation wire core (fourth core in neutral core) into the line core insulation three smaller section, the three small core symmetrical cable, special cable for 6/10kV frequency conversion motor, the cable structure and 6/10kV ordinary power cable is different, the ordinary power cable is a three insulating wire cores with copper tape shielding after a cable, and cable special inverter motor phase sheath package crowded by copper copper tape screened, then symmetrical cable, cable structure due to symmetry the interchangeability of the wire, have better electromagnetic compatibility, to suppress the electromagnetic interference, frequency offset can be odd higher harmonic them, improve the anti-interference of special cable of frequency variable motor, reducing electromagnetic radiation in the entire system.

2 Design of the shielding structure
Shielding 1.8/3kV cable and the frequency conversion motor generally use the total shielding, shielding 6/10kv special cable frequency conversion motor from phase shield structure, phase shielding can be used in copper tape shielding or copper wire copper composite shielding. The total shielding structure can use copper strip, copper wire braided shielding composite shield, a copper strip shielding, copper wire braided copper tape shielding, shielding layer section and master core section according to a certain proportion. Shielded cable is the structure can resist the electromagnetic induction, poor grounding and power line conducted interference, decreasing the inductance, prevent the induction electromotive force is too large. The shielding layer is to suppress the electromagnetic wave emitted role, but also can be used as a short circuit current channel, can play a role in the protection of neutral wire. 6/10kV cable special inverter motor, considering the cable in use process often subjected to radial force, increase the galvanized steel strip armoring layer on the outside the cable shielding layer (between the shielding layer and steel tape armoring layer and isolation sets). Steel tape armoured cable is mainly used as the radial mechanical protection layer, at the same time it also plays additional general shielding, steel tape armoured and especially copper, copper strip shielding, using two different shielding materials, play a complementary role in electromagnetic wave shielding, shielding effect will be better.

3 Design of cable electrical performance
1.8/3kV and the frequency conversion cable electrical performance according to GB/Tl2706, 2002 standard design. 6/10kV variable frequency motor cable to meet GBT/l2706.2002 standards, increasing performance requirements of capacitive and inductive power. According to the actual use of special cable of frequency variable motor and with reference to GB/T 12706.2002 and ABB company technical condition of power transmission cables, electrical performance parameters of the cable was determined.

4 The main manufacturing processes for the cable
In the production process of special cable of frequency conversion motor, insulation wire core extruded process, cabling process is the most critical processes.
Quality of insulated wire core insulation wire cores extruded process will directly affect the performance of electrical cable. In order to improve the quality of the cable, we choose high performance insulating material production, such as the 1.8/3kv frequency conversion motor cable, XLPE insulation materials by using 10kV, 6/10kv cable special inverter motor with 35kV crosslinked insulation materials, insulation conductor shielding, shielding and insulating materials were collected using imported materials. In the production process, we pay particular attention to the purification of raw materials, shielding and insulating material extruded closely, control of insulation eccentricity and the outer insulation diameter is uniform, this can reduce the effect of the interface, improve the electrical properties of the cable.

Cabling process frequency cable structure symmetry, a cable must be insulated wire core uniform tension, so that the cable line core length consistent as possible, otherwise it will cause structural changes, resulting in uneven inductance and capacitance, affect the performance of electrical cable. And the best in a back twist of cable of equipment to complete the.

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