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Special cable for variable frequency motor and manufacture method thereof

A special cable and variable frequency motor technology, which is applied in the direction of cable/conductor manufacturing, insulated cables, cables, etc., can solve the problems of large demand, grounding core breakdown, breakdown, etc., to improve anti-interference and suppress electromagnetic interference , Reduce the effect of electromagnetic radiation

Inactive Publication Date: 2011-08-17
天津市津特能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the obvious energy-saving effect of frequency conversion devices, more and more frequency conversion equipment is used, and the demand for special cables (special frequency conversion cables) matching them is increasing, and the technical requirements are also getting higher and higher. Can no longer meet the usage requirements
Due to the relatively wide range of frequency conversion equipment, its output waveform is no longer a sine wave, but only a rough outline of the main frequency, also known as a ladder wave, which can be decomposed into sine fundamental waves and higher harmonics. As a traveling wave, after multiple reflections, the amplitude is superimposed so that the voltage can reach several times the rated voltage of the system, and the longer the cable, the higher the amplitude. The pulse voltage caused by this high-order harmonic has a great impact on the cable. If the cable insulation safety factor is not high, it is likely to be broken down
Taking the 3+E type power cable as an example, in a complete three-phase system, when the three-phase current is balanced, the current of the grounding core is zero; The peak or trough is superimposed on the trough, and the longer the cable, the more obvious this imagination is, and for the 3+E type cable, the current component generated by the high-order harmonic has no phase difference in the grounding core, so it may be superimposed up to It is several times of the original component, and eventually the grounding core is quickly broken down under high-frequency pulses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Special cable for frequency conversion motor, specification 3*16+1*10mm 2 .

[0011] copper conductor

[0012] XLPE insulation

[0013] PVC sheath

[0014] Will 3*16+1*10mm 2 The neutral wire core in is decomposed into 3 small section wire cores (approximately 3.3mm 2 ), take the upper specification as 4mm 2 , it becomes 3*16+3*4mm 2 , Extrude a layer of 0.9 / 0.7mm thick cross-linked polyethylene material on the conductor core as an insulating layer, and twist the insulated cores in a cross-symmetrical arrangement to form a cable. Braid a layer of overall shielding (braiding density not less than 85%) or other forms of overall shielding on the cable core, and extrude the sheath of PVC (other materials can also be used).

Embodiment 2

[0016] Special cable for frequency conversion motor, specification 3*50+1*25mm 2 .

[0017] copper conductor

[0018] XLPE insulation

[0019] PVC sheath

[0020] Will 3*50+1*25mm 2 The neutral wire core in is decomposed into 3 small section wire cores (approximately 8.3mm 2 ), take the upper specification as 10mm 2 , it becomes 3*50+3*10mm 2 1. Extrude a layer of 1.1 / 0.9mm thick cross-linked polyethylene material on the conductor core as an insulating layer, and twist the insulated cores in a cross-symmetrical arrangement to form a cable. Braid a layer of overall shielding (braiding density not less than 85%) or other forms of overall shielding on the cable core, and extrude the PVC sheath.

Embodiment 3

[0022] Special cable for frequency conversion motor, specification 3*25+1*16mm 2 .

[0023] copper conductor

[0024] XLPE insulation

[0025] PVC sheath

[0026] Will 3*25+1*16mm 2 The neutral core in the center is decomposed into three small cross-section cores (about 5.3mm 2 ), take the upper specification as 6mm 2 , it becomes 3*25+3*6mm 2 , Extrude a layer of 0.9 / 0.7mm thick cross-linked polyethylene material on the conductor core as an insulating layer, and twist the insulated cores in a cross-symmetrical arrangement to form a cable. Braid a layer of overall shielding (braiding density not less than 85%) or other forms of overall shielding on the cable core, and extrude the PVC sheath.

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PUM

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Abstract

The invention relates to a special cable for a variable frequency motor and a manufacture method thereof. Symmetric type cabling is adapted for the core number of the cable; total shielding layers or combined type shielding layers are weaved or wrapped outside cable cores; the symmetric type cabling is realized by adopting symmetric type third-class cores or decomposing a fourth core included in common three-large one-small four-core insulating cable cores into three insulating cable cores with uniform sections and symmetrically cabling three-large three-small cable cores; and the density of the total shielding layers weaved outside the cable cores is not less than 85 percent. The special cable has electromagnetic compatibility, plays a certain role in inhibiting electromagnetic interference, can offset the odd-order frequency of high-order harmonics and enhance the anti-interference performance of the special cable for the variable frequency motor and reduces the electromagnetic radiation of an integral system.

Description

technical field [0001] The invention belongs to the technical field of new cables, and relates to a special cable for variable frequency motors and a preparation method thereof. Background technique [0002] Due to the obvious energy-saving effect of frequency conversion devices, more and more frequency conversion equipment is used, and the demand for special cables (special frequency conversion cables) matching them is increasing, and the technical requirements are also getting higher and higher. Can no longer meet the usage requirements. Due to the relatively wide range of frequency conversion equipment, its output waveform is no longer a sine wave, but only a rough outline of the main frequency, also known as a ladder wave, which can be decomposed into sine fundamental waves and higher harmonics. As a traveling wave, after multiple reflections, the amplitude is superimposed so that the voltage can reach several times the rated voltage of the system, and the longer the ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/00H01B7/02H01B7/17H01B13/00
Inventor 常计章
Owner 天津市津特能源科技有限公司
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