CN102967797A - 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 that (1) two even leads equal in length and interval are selected in the cable; (2) two testing meter pens of a capacitance 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 distributed capacitance C1 between the lead ab and the lead cd; (3) the two testing meter pens of the capacitance testing instrument or device are connected with the endpoint b and an endpoint d of the lead ab and the lead cd respectively to obtain distributed capacitance C2 between the lead ab and the lead cd; and (4) a relative distance X between the short dot position and the endpoint c is obtained through calculation according to a formula. 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 breakpoint of cable method for detecting position

Technical field

The present invention relates to a kind of breakpoint of cable 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 breakpoint of cable method for detecting position of easy operating, be used for the electric discontinuity of cable abort situation is tested.

Technical solution of the present invention is:

A kind of breakpoint of cable 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 capacity measurement instrument or equipment are connected respectively to end points a and the end points c of wire ab and wire cd, record the distributed capacitance C1 between wire ab and the wire cd;

3] two test test pencils of capacity measurement instrument or equipment are connected respectively to end points b and the end points d of wire ab and wire cd, record the distributed capacitance C2 between wire ab and the wire cd;

4] calculate breakpoint location apart from the relative distance X of end points c according to formula:

$X=\frac{C1}{C1+C2}\×100\%.$

The present invention has the following advantages:

1, the present invention can utilize general capacity measurement instrument or special-purpose electric capacity testing tool equipment, realizes easily the test of cable breakpoint fault position;

3, test philosophy of the present invention is simple, and is simple to operate, is particularly suitable for the open circuit fault 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 breakpoint of cable 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 wire ab and wire cd are two isometric, equally spaced homogeneous conductors in the cable,

Breakpoint of cable position probing step is as follows:

A) two test test pencils of capacity measurement instrument or equipment are connected respectively to end points a and the end points c of Fig. 1, record distributed capacitance C1;

B) two test test pencils of capacity measurement instrument or equipment are connected respectively to end points b point and the end points d of Fig. 1, record distributed capacitance C2;

C) calculate breakpoint location apart from the relative distance X of end points c according to formula (1).

$X=\frac{C1}{C1-C2}\×\%---\left(1\right)$

By the length L of the X that calculates and the wire ab that measures and wire cd, again basis

Just can determine that breakpoint is L1=LX apart from the particular location of end points c, wherein L1 be breakpoint apart from the distance of end points c, L2 is that breakpoint is apart from the distance of end points d.

The present invention is mainly used in the detection of the open circuit fault point position of the above cable 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 breakpoint of cable 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 capacity measurement instrument or equipment are connected respectively to end points a and the end points c of wire ab and wire cd, record the distributed capacitance C1 between wire ab and the wire cd;

3] two test test pencils of capacity measurement instrument or equipment are connected respectively to end points b and the end points d of wire ab and wire cd, record the distributed capacitance C2 between wire ab and the wire cd;

4] calculate breakpoint location apart from the relative distance X of end points c according to formula:

$.X=\frac{C1}{C1+C2}\×100\%$

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