Multi-core cable long distance distinguishing method

A multi-core cable and discrimination method technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve cumbersome, difficult, time-consuming and other problems, and achieve the effect of saving personnel and low production cost

Inactive Publication Date: 2013-04-10
TAIYUAN UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

For example, when connecting communication cables in a coal mine roadway, there is such a problem: a certain signal line at the equipment end is blue, but at the control room side, it is found to be brown through repeated inspections.
[0003] In the prior art, the multi-core cable discrimination test method is as follows: figure 1 Shown: A group of people short-circuit any two core wires at one end, short-circuit "1" and "2" on the left side of the cable, and another group of people at the other end, as shown figure 1 On the left side of the medium cable, use tools such as a multimeter to find the two ends of the short circuit. It is time-consuming to find it blindly, and both ends require personnel. It is very inconvenient to communicate with each other by shouting or using the phone.
The traditional method is cumbersome. If the distance is long, you have to contact each other by phone, which is easy to make mistakes and takes a long time
When wiring cables in a roadway without communication signals, because the construction personnel at both ends of the cable cannot get in touch, the wiring becomes inconvenient and difficult

Method used

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  • Multi-core cable long distance distinguishing method
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  • Multi-core cable long distance distinguishing method

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Embodiment Construction

[0040] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] see figure 2 , is a schematic diagram of a multi-core cable.

[0042] Table 1 The resistivity of common metal core wires (in the case of L=1000m, S=1×10 -6 m 2 example)

[0043]

[0044] Such as image 3 As shown, the multi-core cable long-distance discrimination method of the present invention comprises the following steps:

[0045] In the first step, according to the length L (unit: meter) of the cable, the resistivity ρ (unit: ohm m) of the material selected for the cable core wire and the cross-sectional area S (unit: square meter) of the cable core wire, use the formula r 0 =ρ×L÷S Estimated resistance r 0 (unit: ohm);

[0046] The second step is to select the configured test resistance m (as long as m>>r 0 That is enough), determine the value of N (N=Z-1) according to the total numbe...

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Abstract

The invention discloses a multi-core cable long distance distinguishing method which uses a 'resistor-cable connector' produced by a test resistor m=10k, is capable of being used repeatedly after one time production and suitable for all the common cable tests. The multi-core cable long distance distinguishing method is capable of combing knowledge related to electricity with mathematical knowledge, actually solving the practical problem during engineering, and efficiently and fast achieving identification and wire connection through popularization and use of the method.

Description

technical field [0001] The invention belongs to the technical field of construction and relates to a long-distance discrimination method for multi-core cables. Background technique [0002] Under coal mines or in construction roadways, long-distance multi-core cables are often laid for communication or control. Sometimes it is unreliable to only rely on the color identification of the cable core, and it may even be misjudged or misconnected. For example, when connecting communication cables in a coal mine roadway, there is such a problem: a certain signal line at the equipment side is blue, but it is found to be brown through repeated inspections at the control room side. In practice, there will be joints in the middle of hundreds of meters of cables, and it is possible that the two ends of the same core wire have different colors. Sometimes the distance between the two ends of the cable is relatively long, and there are spacers in the middle. For example, one end of a com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 郝俊青李志峰杨建伟刘宏伟
Owner TAIYUAN UNIV OF TECH
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