CN102967796A - Detecting method for short dot position of cable - Google Patents

Abstract

The invention relates to a detecting method for a short dot position of a cable. The detecting method includes the following steps that (1) two even leads equal in length and interval are selected in the cable; (2) two testing meter pens of a resistance testing instrument or device are connected with an endpoint a and an endpoint c of the lead ab and the lead cd respectively to obtain resistance Rac; (3) the two testing meter pens of the resistance testing instrument or device are connected with the endpoint a and an endpoint b of the lead ab respectively to obtain resistance Rab; and (4) the two testing meter pens of the resistance testing instrument or device are connected with the endpoint c and an endpoint d of the lead cd to obtain resistance Rcd and the like. By means of the method, the technical problem that the existing cable fault point detecting method is high in testing requirements and complex in a testing process is solved. The detecting method has the advantages of being convenient, easy to operate and the like.

Description

A kind of cable short-circuit position method for detecting position

Technical field

The present invention relates to a kind of cable short-circuit position method for detecting position.

Background technology

Existing cable test is generally tested the conducting resistance of each root heart yearn of cable, insulation resistance and the index such as withstand voltage between heart yearn, and some situation also requires the short circuit of cable or open circuit fault point position are tested.

Common position of failure point method of testing is pulse reflection method, mainly is to utilize cable to change and cause that the pulse wave reflection carries out localization of fault in the impedance of position of failure point place.Pulse reflection method utilizes transmission speed and the transmission time (that is, the mistiming of reflected impulse ripple and incident pulse ripple) of pulsating wave in cable to calculate the position of trouble spot in cable.The pulse reflection method complicated operation need to adopt Special pulse signal generator and pulsating wave testing tool, and the knowledge that requires simultaneously the operator to have specialty is carried out specialty analysis to the reflection configuration data and calculated, a last aptitude test position of being out of order.In addition, for breakout cable or complicated cable, when the quantity of impedance mismatch point position during greater than one, reflection configuration is comparatively complicated, is not suitable for adopting pulse reflection method to carry out the position of failure point detection.

Summary of the invention

In order to solve high, the complicated technical matters of test process of existing cable trouble point checking method test request, the invention provides a kind of easily, a kind of cable short-circuit position method for detecting position of easy operating, be used for the cable short circuit abort situation is tested.

Technical solution of the present invention is:

A kind of cable short-circuit position method for detecting position, its special character is, may further comprise the steps:

1] in cable, select two isometric, equally spaced homogeneous conductors: wire ab and wire cd, two end points setting wire ab are a, b, two end points setting wire cd are c, d, and end points a, end points c are positioned at the same side;

2] two test test pencils of resistance test instrument or equipment are connected respectively to end points a and the end points c of wire ab and wire cd, record resistance R ac;

3] two test test pencils of resistance test instrument or equipment are connected respectively to end points a and the end points b of wire ab, record resistance R ab;

4] two test test pencils of resistance test instrument or equipment are connected respectively to end points c and the end points d of wire cd, record resistance R cd;

5] calculate the short dot position apart from the relative distance X of end points c according to formula:

$X=\frac{\mathrm{Rac}}{\mathrm{Rab}+\mathrm{Rcd}}\×100\%.$

The present invention has the following advantages:

1, the present invention can utilize general resistance test instrument or special resistors testing tool equipment, realizes easily the test of cable short-circuit position abort situation;

2, test philosophy of the present invention is simple, and is simple to operate, is particularly suitable for opening circuit or the short circuit trouble point position probing of main equipment and system's middle and long distance cable, can be applicable in the fields such as boats and ships, space flight, aviation, large test system and automatic factory.

Description of drawings

Fig. 1 is the schematic diagram of cable short-circuit position method for detecting position of the present invention.

Embodiment

As shown in Figure 1, a kind of breakpoint of cable method for detecting position supposes that selection wire ab and wire cd are two isometric, equally spaced homogeneous conductors in the cable,

Cable short-circuit position position probing step is as follows:

A) two test test pencils with resistance test instrument or equipment are connected respectively to end points a shown in Figure 1 and end points c, record conductor resistance Rac=R1+R2;

B) two test test pencils with resistance test instrument or equipment are connected respectively to end points a point and end points b shown in Figure 1, record conductor resistance Rab=R1+R3;

C) two test test pencils with resistance test instrument or equipment are connected respectively to end points c point and end points d shown in Figure 1, record conductor resistance Rcd=R2+R4;

D) calculate the relative distance X of ordering apart from c in the short dot position according to formula (1).

$X=\frac{\mathrm{Rac}}{\mathrm{Rab}+\mathrm{Rcd}}\×100\%---\left(1\right)$

Rac=R1+R2 wherein, Rab=R1+R3, Rcd=R2+R4, R1 is the conductor resistance between cable short-circuit position and the end points a, R3 is the conductor resistance between cable short-circuit position and the end points b, and R2 is the conductor resistance between cable short-circuit position and the end points c, and R4 is the conductor resistance between cable short-circuit position and the end points d.Again because:

$X=\frac{L1}{L1+L2}\×100\%$

By the length L of the X that calculates and the wire ab that measures and wire cd, just can determine the particular location of short dot:

L1=XL。

The present invention is mainly used in the detection of the above cable short circuit position of failure point of 2 cores.For the test of single condctor, also can pass through the above cable of auxiliary composition 2 cores of outer lead, thereby adopt said method to realize that the position of failure point of single condctor detects.

Claims (1)

1. a cable short-circuit position method for detecting position is characterized in that, may further comprise the steps:

1] in cable, select two isometric, equally spaced homogeneous conductors: wire ab and wire cd, two end points setting wire ab are a, b, two end points setting wire cd are c, d, and end points a, end points c are positioned at the same side;

2] two test test pencils of resistance test instrument or equipment are connected respectively to end points a and the end points c of wire ab and wire cd, record resistance R ac;

3] two test test pencils of resistance test instrument or equipment are connected respectively to end points a and the end points b of wire ab, record resistance R ab;

4] two test test pencils of resistance test instrument or equipment are connected respectively to end points c and the end points d of wire cd, record resistance R cd;

5] calculate the short dot position apart from the relative distance X of end points c according to formula:

$X=\frac{\mathrm{Rac}}{\mathrm{Rab}+\mathrm{Rcd}}\×100\%.$

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