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Introduction of PVC insulated power cable for coal mine
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One Summary

One point one Product characteristics

A. The products are specially designed and specialized flame retardant materials. , The cable has good flame retardancy. Product implementation MT818.12 and MT386 standard.

B. Inherent characteristics of PVC cable material , Cable is suitable for high drop and vertical laying.

C PVC cable material has prominent acid resistance, alkali resistance and oil resistance and high heat resistance; therefore, when cable is used in the above environment, PVC cable material is used. , All properties can maintain stability for a long time. , The operation is safe and reliable.

D. Due to the inherent characteristics of PVC cable material, its dielectric loss is high under strong electric field, and its electrical conductivity increases sharply with the increase of electric field intensity, so the product is not recommended. 3.6/6kV And the above line is used.

One point two Product usage and scope of application

The use of PVC insulated power cables for underground coal mines or underground fixed exchanges 50Hz Rated voltage Uo/U by 0.6/1kV And the transmission and distribution of power in the following transmission and distribution lines. It is also allowed to use the nominal voltage of the system not greater than the rated voltage of the cable. One point five Double DC system.

The rated voltage of the cable should be suitable for the operation of the cable system. , use U O/U (U) M ) Express , They are all valid values. , Unit is KV.

U Zero Rated voltage between conductor and shield or metal sleeve for cable design.

U - rated power frequency voltage between conductors for cable design;

U M Maximum voltage of equipment ( Maximum value of maximum voltage for equipment and system )

The applicable scope of each type of cable is shown in table. One

surface One Cable type, name and scope of application

Model

Name

Scope of application

MVV

PVC insulated PVC sheathed power cables for coal mines

Laying in underground, tunnel and pipeline, the cable can not bear external force.

MVV22

PVC insulated PVC sheathed steel tape armored power cables for coal mines

Laying in underground, tunnel, pipeline, cable can bear mechanical external force, but can not withstand large pulling force.

One point three Product type and specification

The varieties and models of PVC insulated power cables for coal mines are shown in table. One

The meaning of each part of the product model is as follows:

        Number one: serial code M - coal mine flame retardant cable;

        Second place: Code for insulation materials V - PVC insulation;

Third place: Code for jacket material V - PVC sheathed when cable is available. When the armor layer is the material code for the inner sheath.

Fourth place: Code for armoured layer. Two Double steel strip; Three Thin round wire; Four Rough round steel wire;

Fifth: Code for outer sheath material. Two - polyvinyl chloride outer sheath.

Model

Core number

Rated voltage 0.6/1kV

Rated voltage 1.8/3kV

Nominal cross section Mm Two

MVV

Three

1.5~300

10~300

MVV22

Three

2.5~300

10~300

MVV

3+1

4~300

10~300

MVV22

3+1

4~300

10~300

MVV

Four

4~185

4~185

MVV22

Four

4~185

4~185

The varieties and specifications of PVC insulated power cables for coal mines are shown in table. Two

surface Two Cable type and specification

One point four Using environmental conditions and working conditions

A. The permissible working temperature of various types of cable conductor cores should not exceed. Seventy When the temperature is short, the longest duration will not exceed. 5S The maximum temperature of the cable conductor shall not exceed One hundred and sixty C.

B. The ambient temperature of cable laying should not be lower than Zero C, if you must Zero The cable should be preheated to below the temperature. Zero It can be laid above the centigrade.

C. The bending radius of the cable should not be less than the outer diameter of the cable. Fifteen Times.

One point five Warning words

      The maintenance and use of cables should be consistent with the provisions of the coal mine safety regulations besides general regulations.

2 product structure

A schematic diagram of the cross sectional structure of various types of cables is shown. One It is shown.


MVV 3 Core (round core) MVV22 3 Core (round core)


MVV 3 Core (sector core) MVV22 3 Core (fan-shaped core) )


MVV 3+1 Core (round core) MVV22 3+1 Core (round core)


MVV 3+1 core (fan-shaped core) MVV22 3+1 core (fan-shaped core)


MVV 4 core (round core) MVV22 4 core (round core)


MVV 4 core (sector core) MVV22 4 core (fan-shaped core)
1 conductor 2 insulation 3 fill 4 Pack 5 inner liner 6 steel strip 7 outer sheath
Fig. 1 Schematic diagram of cross section structure of cable

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