RU62480U1 - HIGH VOLTAGE CABLE FOR 6 AND 10 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. The cable used in the mines must be fireproof. The developed cable of the KGETN brand is designed to connect excavators and other mobile mechanisms or electrical installations to electrical networks with insulated neutral at a rated alternating current voltage of a nominal frequency of 50 Hz of the main conductors - 6 and 10 kV, auxiliary - 380 V. The main factors of economic efficiency is to increase the fire safety of the cable expanding the scope of the cable.

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 a mine cable that meets consumer requirements remains highly relevant.

An analog of development can be considered a cable of the KGET brand (patent for utility model No. 35468 and No. 34032) with three main shielded cores, heat-resistant rubber insulation, grounding conductor, auxiliary conductor with or without it, with a rubber sheath. [2]

The disadvantages of the analogue is

- the cable spreads combustion.

The developed cable of the KGETN brand is intended for connecting excavators and other mobile mechanisms or electrical installations to electric networks with insulated neutral at a rated voltage of alternating current of a nominal frequency of 50 Hz of the main conductors - 6 and 10 kV, auxiliary - 380 V.

Type of climatic modification - U, placement category 5 at ambient temperature from minus 30 ° С to 50 ° С.

Technical specifications

Electrical insulation resistance of the main cable cores, calculated per 1 km of length and temperature of 20 ° C, MOhm, not less than:

- at the time of acceptance and delivery 200; - for the period of storage and operation 10.

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 is not less than:

- for a cable for a rated voltage of 6 kV  - 9 kV; - for a cable for a rated voltage of 10 kV  - 12 kV.

Discharge voltage not less than:

- for a cable for a rated voltage of 6 kV  - 6 kV; - for a cable for a rated voltage of 10 kV  - 10 kV.

Mechanical Requirements

The cable is resistant to bends at an angle of ± π / 2 rad.

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

Table 1 Cable brand Rated voltage, kV Nominal section of the main veins, mm ² Tensile Force, N (kgf) Nominal diameter of a roller, mm The number of bending cycles KGETN 6 10-50 196 (20) 400 4000 70-185 196 (20) 600 3000 10 25-70 490 (50) 600 1000 95-150 490 (50) 800 750

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

External exposure requirements

Long-term permissible temperature on the conductors of the cable is not higher than 85 ° С, the maximum allowable ambient temperature during cable operation is 50 ° С, the minimum allowable ambient temperature during operation is minus 30 ° С, the cable during operation is resistant to changes in the ambient temperature from minus 30 ° C to plus 50 ° C;

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

The cable does not spread combustion.

Reliability requirements

The service life of the cable, within which the operating time is provided, is at least 3 years, the actual service life of the cable is set to 5 years, subject to the rules of storage, installation and operation, and is determined during operation, the service life is calculated from the time the cable was manufactured.

The design of the cable KGETN presented in figure 1.

Copper conductive cable conductors 1 - correspond to the 5th class of flexibility. The main conductive cable conductors are sequentially superimposed with an inner shield of electrically conductive rubber 2, heat-resistant rubber insulation 3, and an outer shield of conductive rubber 2. The inner conductive shield 2 will be separated from the core without end-to-end damage. The outer conductive screen 2 will separate from the insulation without damaging it. The cable design has a grounding conductor 4 and an auxiliary conductor in rubber insulation 5. The twisted cable cores are wrapped with synthetic film 6 and a two-layer sheath of rubber is applied (inner 7 and outer sheath 8). The outer shell is made of rubber that does not spread combustion during a single installation.

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

The main factor of economic efficiency is increasing the fire safety of the cable, expanding the scope of 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. RF patent not useful model No. 35468, RF patent for useful model No. 34032.

Claims (1)

High-voltage cable for voltage of 6 and 10 kV, consisting of three main shielded cores with heat-resistant rubber insulation, grounding cores and auxiliary cores in a two-layer sheath, characterized in that rubber is used for the manufacture of the cable as an outer sheath, which ensures that combustion does not spread during a single installation .