CN202563966U - Low voltage cable special for frequency converter - Google Patents

Abstract

The utility model discloses a low voltage cable special for a frequency converter. Main wire cores and neutral wire cores are hinged to form a cable core. Fillers are arranged in a clearance and an outer side of the cable core. An inside liner, an overall shielding layer and a sheath layer are sequentially arranged outside the fillers on the outer side of the cable core. The number of the main wire cores and the number of the neutral wire cores are both three, and the three main wire cores and the three neutral wire cores are symmetrically arranged and hinged. The structure of the low voltage cable special for the frequency converter guarantees that the cable has excellent electrostatic coupling resistant and electro-magnetic induction resistant abilities when the cable is used, service life of the cable is obviously prolonged, safe reliability of the cable is significantly improved, and meanwhile costs due to the fact that a user changes the cable frequently are reduced, so the low voltage cable special for the frequency converter has good social efficiency and economic benefit.

Description

A special low-voltage cable for frequency converter

technical field

The utility model relates to a cable, in particular to a symmetrical shielding special cable for connecting a variable frequency motor and a variable frequency power supply. the

Background technique

At present, all aspects of equipment included in the frequency conversion speed regulation technology at home and abroad are relatively mature, but the connection cables between the frequency conversion motor and the frequency conversion power supply have not received enough attention. In the past, a general four-core power cable was usually used. This cable consists of three main cores with a larger cross-section and a neutral core with a smaller cross-section. Fill with stuffing and squeeze the sheath. This kind of cable has no anti-static coupling and anti-electromagnetic induction ability during use, so that the cable has problems of breakdown and short service life in a short period of time. the

Utility model content

The technical problem to be solved by the utility model is to provide a special low-voltage cable for frequency converter with excellent shielding performance, good safety and long service life. the

The utility model relates to a low-voltage cable dedicated to a frequency converter, which is composed of a main wire core and a neutral wire core twisted into a cable core, fillers are arranged in the gap and outside of the cable core, and inner lining layers are sequentially arranged outside the filler outside the cable core 1. The overall shielding layer and the sheath layer. There are three main wire cores and three neutral wire cores respectively, and the three main wire cores and the three neutral wire cores are symmetrically arranged and twisted. the

The main core is composed of a conductor, an insulating layer and a sub-shielding layer arranged outside the conductor in sequence. the

The structure of the utility model ensures that the cable has excellent anti-static coupling and anti-electromagnetic induction capabilities during use, so that the service life of the cable can be significantly improved, thereby significantly improving the safety and reliability of the cable, and at the same time reducing the frequent replacement of cables by users. The expenses incurred have good social and economic benefits. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

Detailed ways

Below in conjunction with example the utility model is described further. the

As shown in Figure 1, the utility model is composed of three main wire cores and three neutral wire cores 4 symmetrically arranged and twisted to form a cable core, and fillers 5 are provided in the gaps and outside of the cable cores, and inner linings are sequentially arranged outside the fillers Layer 6, overall shielding layer 7 and jacket layer 8. the

The conductor 1 of the main core adopts a stranded copper structure with 19 single wires with a diameter of 2.56 mm, the neutral core 4 adopts a stranded copper structure with 7 single wires with a diameter of 1.7 mm, and the insulating layer 2 adopts cross-linked polyethylene , The sub-shielding layer 3 and the overall shielding layer 7 are shielded by a combination of copper-clad aluminum wire and aluminum alloy tape, the filler 5 is made of PP rope, the inner lining layer 6 is made of PP tape, and the sheath 8 is made of polyvinyl chloride. The cable has excellent shielding performance and can achieve a high degree of anti-static coupling, electromagnetic induction, radio waves and power line conduction interference. the

The utility model adopts three main wire cores with larger cross-sections and three neutral wire cores with smaller cross-sections symmetrically arranged and stranded to form a cable core, and then the inner lining layer and the total shielding layer are added after filling fillers. Compared with ordinary power cables, it has an interchange effect, which can partially suppress interference; when high-order latent wave current components appear in the line, the sum of the shielding layer current is zero, and no interference is generated to the outside world. The cable structure has low and uniform positive (reverse) sequence and zero sequence impedance, and the resistance value of the shielding layer in the zero sequence working state is much lower than that of ordinary cables, which is conducive to the safe operation of cables and other related equipment. Shielding adopts metal wire braiding and/or metal tape wrapping combined shielding (in order to improve cost performance, copper-clad aluminum wire and aluminum alloy tape are preferred), which can effectively suppress electromagnetic radiation, anti-static coupling, electromagnetic induction, etc. This cable has excellent shielding performance and can achieve anti-static coupling, electromagnetic induction, radio waves and power line conduction interference. It is a special symmetrical shielding cable for variable frequency motors.    

There are many specific application ways of the utility model, and the above descriptions are only the preferred implementation modes of the utility model. Improvements, these improvements should also be regarded as the protection scope of the present utility model.

Claims (2)

1. the special-purpose low-voltage cable of a frequency converter; Be twisted into cable core by master core and neutral core (4); Gap and outside at cable core are provided with filler (5), outside the outside filler of cable core, set gradually inner covering (6), total screen (7) and restrictive coating (8), it is characterized in that; Said master core and neutral core (4) respectively have three, and three master cores and three neutral cores (4) symmetric arrays are stranded.

2. the special-purpose low-voltage cable of frequency converter according to claim 1, said master core are by conductor (1) and be successively set on conductor outer insulating barrier (2) and sub-shield (3) and form.