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Coal mine cables
NegotiableUpdate on 05/06
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Overview
Coal mine cable is the abbreviation for coal mine cable. Mining cables are all flame-retardant cables and should be issued with a mining product safety mark certificate by the National Mining Product Safety Mark Center. U-shaped (M-type) rubber sheathed cable for coal mines
Product Details
Scope of application
Coal mine cablesRubber sheathed flexible cables are suitable for mobile laying cables used in mining power equipment with rated voltage U0/U 8.7/10KV and below.
use characteristics
The rated voltage U0/U of the power frequency is 380/660V, 660/1140V, 1.9/3.3kv, 3.6/6kv, 6/10KV, 8.7/10KV, and 300/500V.
The maximum allowable working temperature for cable conductors is 65 ℃ and 90 ℃
The allowable working environment temperature for cables is -35 ℃
● Cable bending radius: not greater than 6 times the outer diameter of the cable.
Coal mine cablesIncluding MC cable, MCP cable, MZ cable, MZP cable, MYQ cable, MY cable, MCPTJ cable, MYPTJ cable, MVV cable,Mkvv cable， Myjv cable, mkyjv cable, mhyv cable, ugf cable, high-voltage mining cable, 10kv rubber sheathed cable, 6kV mining cable, mining mobile cable, mining flame-retardant cable, mcpt cable, mining rubber sheathed cable.
choice
In the mine power supply system, high-voltage power supply lines generally use armored cables, which have a much lower failure rate compared to low-voltage power supply. The power supply in mining areas is a weak link in the power supply system, and the working environment is poor. Therefore, how to choose the type and cross-section of cables is related to the safety of power supply operation. The following introduces the selection of cables and the method of selecting cable cross-sections.
Selection of cable model
The selection of cable models is closely related to the reliability, safety, and economic feasibility of power supply. 《Coal Mine Safety Regulations》Article 467 stipulates the following selection requirements for the selection of cables:
The level difference of the actual cable laying location should be compatible with the allowable cable laying level difference specified.
2. The cable should have a conductor of sufficient cross-section for protective grounding.
3. It is strictly prohibited to use aluminum wrapped cables.
4. Flame retardant cables that have passed inspection and obtained the safety mark for coal mining products must be selected.
5. The cross-section of the main cable core should meet the requirements of the power supply line load.
6. Requirements for fixed installation of high-voltage cables:
(1) In vertical shafts or tunnels with an inclination angle of 45 ° or more, the use ofpolyvinyl chlorideInsulated thick steel wire armored PVC sheathed power cablecross-linked polyethyleneInsulated thick steel wire armored PVC sheathed power cable.
(2) In horizontal tunnels or shafts with an inclination angle of less than 45 °, PVC insulated steel strips or fine steel wire armored PVC sheathed power cables, cross-linked ethylene steel strips or fine steel wire armored PVC sheathed power cables should be used.
(3) Aluminum core cables can be used in the air intake inclined shaft, underground parking lot and its vicinity, and between the central substation and the mining area substation; Copper core cables must be used in other locations.
(4) Fixed low-voltage cables should use Mw armored or unarmored cables or corresponding voltage level mobile cablesrubber-sheathed flexible cable.
(5) Non fixed high and low voltage cables must use those that comply with the Mr818 standardrubber-sheathed flexible cableMobile and handheld electrical equipment should use specialized equipmentRubber sheathed cable.
(6) Cables used for lighting, communication, signaling, and control should be armored communication cables, rubber sheathed cables, or M, factory, factory type plastic cables.
(7) Aluminum cores should not be used for low-voltage cables, and aluminum cores are strictly prohibited for low-voltage cables in mining areas.
Selection of cable cross-section
The selection of cable cross-section includes the selection of high-voltage cable cross-section and low-voltage cable cross-section, with the selection of low-voltage cable cross-section being the main focus.
1. Selection of the main core wire of the cable
The low-voltage power supply lines in general mining areas are relatively long, and the current flowing through the cables during operation will cause voltage drop and heat generation. To ensure the normal operation of cables and motors, the following four principles should be followed when selecting cable cross-sections:
(1) When the cable is running normally, its actual temperature rise should not exceed the maximum temperature rise allowed by the insulation.
(2) Select based on the allowable voltage loss during cable operation.
(3) The selection of cable cross-section should meet the requirements of mechanical strength.
Mining cables refer to the surface and underground equipment used in coal mining industrywire and cableproduct includingshearerCables for transport aircraft, communication, lighting, and signal equipment, as well as drill cables, cap light wires, and power cables for underground mobile substations.
