RU60262U1 - HIGH VOLTAGE CABLE WITH RUBBER INSULATION FOR 6 KV VOLTAGE - Google Patents

Abstract

The utility model relates to the cable industry of the electrical industry and can be used in the mining industry to connect excavators and other mobile mechanisms or electrical installations to electrical networks with insulated neutral. Creating an excavator cable that meets consumer requirements remains highly relevant. The developed cable of the KGPE brand is designed to connect excavators and other mobile mechanisms or electrical installations to electrical networks with insulated neutral at a rated voltage of alternating current of a nominal frequency of 50 Hz of the main conductors - 6 kV, auxiliary - 380 V. The main factor of economic efficiency is the reduction of costs when cutting the cable and increased operational performance.

Description

The utility model relates to the cable industry of the electrical industry and can be used in the mining industry to connect excavators and other mobile mechanisms or electrical installations to electrical networks with insulated neutral.

Creating an excavator cable that meets consumer requirements remains highly relevant.

Known cable brand KGE with three main shielded cores, rubber insulation, residential grounding, auxiliary residential, in a rubber sheath.

The disadvantages of the analogue are:

- outdoor electrically conductive screens are not separated from the rubber insulation,

- the presence of destruction of the auxiliary core during operation;

- the cable is poorly visible during operation due to the use of a sheath of dark tones.

The developed cable of the KGPE brand is designed to connect excavators and other mobile mechanisms or electrical installations to electrical networks with insulated neutral at a rated voltage of alternating current of a nominal frequency of 50 Hz of the main conductors - 6 kV, auxiliary - 380 V.

Type of climatic modification - У, ХЛ and Т, placement category 1 at ambient temperature from minus 60 ° С to 50 ° С.

Technical specifications:

The electrical insulation resistance of the main cable cores, calculated per 1 km of length and a temperature of 20 ° C, must be at least 50 MΩ.

The electrical resistance of the shields of the main cable cores at a temperature of 20 ° C is not more than 300 Ohms.

The voltage for the occurrence of partial discharges of shielded main cores must be at least 9 kV. The discharge termination voltage must be at least 6 kV.

Requirements for mechanical parameters:

The cable must be resistant to bends of ± π / 2 rad.

The nominal tensile force, the nominal diameter of the rollers and the number of bending cycles must correspond to the values indicated in table 1.

Table 1 Cable brand Nominal section of the main veins,
mm ² Nominal tensile force, N (kgf) Nominal diameter of a roller, mm The number of bending cycles KGPE 10-50 196 (20) 400 4000 70-150 600 3000

The cable must be resistant to mechanical environmental factors in accordance with the group of operating conditions M19 in accordance with GOST 17516.1.

Requirements for external factors:

The long-term permissible temperature on the conductive conductors of the cable should be 70 ° C.

The maximum permissible ambient temperature during cable operation should be 50 ° C.

Minimum permissible ambient temperature during operation minus 60 ° С.

The cable during operation must be resistant to changes in ambient temperature from minus 60 ° С to plus 50 ° С;

The insulation of the main cable cores must be ozone-resistant for at least 3 hours at an ozone concentration of (0.0150 ± 0.0015)% by volume.

A cable designed for use in tropical climates must be resistant to mold damage.

Reliability Requirements:

The service life of the cable, within which the operating time is provided, must be at least 3 years.

The actual cable service life is set to 5 years, subject to the rules of storage, installation and operation and is determined during operation.

Service life is calculated from the date of manufacture of the cable.

The design of the cable KGPE presented in figure 1.

Copper conductive cable conductors 1 - correspond to the 5th class of flexibility.

The main conductive cable strands are sequentially superimposed with an inner shield of electrically conductive rubber 2, rubber insulation 3, and an outer shield of electrically conductive rubber 2.

The internal electrically conductive screen 2 is separated from the core without through damage.

The outer conductive screen 2 is separated from the insulation without damaging it.

The cable design has a grounding conductor 4 and an auxiliary conductor 5 with insulation from a block copolymer of propylene with ethylene 6.

The twisted cable strands are wrapped with synthetic film 7 and a two-layer sheath of rubber is applied - (inner 8 and outer sheath of light tones 9).

The technical result of the utility model is to improve the operational characteristics of the product.

The main factor in economic efficiency is the reduction in costs when cutting the cable.

The electrical safety requirement is ensured by the electrical resistance of the screens, - 300 Ohms, insulation thickness, overvoltage test.

Literature:

1. Information and technical collection. Cable products. Volume 1, part 2 Moscow. VNIIKP OJSC 2005

2. TU 16.K73.02-88 - “Flexible power cables for voltage 6 kV” Specifications. NIKI Tomsk OJSC Tomsk 1988

Claims (1)

A high-voltage cable with rubber insulation at a voltage of 6 kV, consisting of three main shielded conductors with rubber insulation, a grounding conductor and an auxiliary conductor in a two-layer sheath, characterized in that the cable is manufactured using: conductive rubber, which allows the outer screen to be separated from the insulation without damaging it ; block copolymer of propylene with ethylene, providing increased resistance of the auxiliary core to mechanical stress; light colors of the sheath, giving the cable greater visibility, which protects the cable from accidental mechanical damage.