<br> <br> select the cable model selected cable type, the power supply reliability, security, and whether the economic rationality have a great relationship. Article 467 of the Coal Mine Safety Regulations establishes the following selection requirements for the selection of cables:
1. The level difference of the actual laying location of the cable should be compatible with the specified cable allowable level difference.
2. Cables shall have conductors of sufficient cross section for protective earthing.
3. Aluminum-coated cables are strictly prohibited.
4. The flame-retardant cable that has passed the inspection and obtained the safety mark of coal mine mining products must be selected.
5. The section of the main cable core should meet the requirements of the power line load.
6. Requirements for fixed laying of high voltage cables:
(1) In shafts and wells with shafts or inclinations of more than 45°, PVC insulated heavy steel wire armored PVC sheathed power cables, cross-linked polyethylene insulated thick steel wire armored PVC sheathed power should be used. cable.
(2) In horizontal roadways or shafts with an inclination of 45° or less, PVC insulated steel strips or thin steel wire armored PVC sheathed power cables, cross-linked vinyl steel strips or fine steel wire armored PVC shall be used. Sheathed power cable.
(3) Aluminum core cables may be used between inclined shafts in inlets, underground depots, and substations in central substations to substations in mining areas; copper core cables must be used in other locations.
(4) The fixed low-voltage cables shall be Mw-mounted or non-armored cables or mobile rubber sheathed cables of the corresponding voltage class.
(5) The non-fixed high and low voltage cables must use the rubber-sleeve flexible cables that meet the requirements of Mr818. Mobile and hand-held electrical equipment should use dedicated rubber sheathed cables.
(6) Cables for lighting, communications, signalling, and control shall use armored telecommunication cables, rubber sheathed cables, or M, factory, and factory-type plastic cables.
(7) Aluminum cores should not be used for low voltage cables, and aluminum cores for low voltage cables in mining areas are strictly prohibited.
Improve life
In the course of use, the local bending radius of the shearer cable is much smaller than the bending radius of the standard cable. The cable is frequently subjected to the combined effects of excessive bending, stretching, and other stress for a long period of time. In addition, the cross section of the core conductor is controlled. It is much smaller than the cross-section of the conductor of the main cable core, resulting in the broken core of the control core.
1. Increase the flexibility of shearer cables used in coal mines;
2. Increase the relative slippage of the control wire core;
3. Increase the strength of shearer cable conductors for coal mines;
4, the conductor from the original bundle of twisted structure was changed to a normal twisted, so that it can increase its bending performance, and then wire braided outside the conductor, and increase its strength;
5, the control core can use tinned copper wire and wire braid weaving, is also a good method.
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