CN103033720B - A kind of long distance discrimination method of polycore cable - Google Patents

Abstract

The invention discloses a kind of long distance discrimination method of polycore cable, " resistance-cable connector " that make with test resistance m=10K, can reuse after producing once, be applicable to common all wireline tests.This method utilizes the relevant knowledge of electric aspect and mathematical knowledge to combine, and by popularization and the use of the method, the real practical problems solved in engineering, efficiently, fast completes identification and the wiring of polycore cable.

Description

A kind of long distance discrimination method of polycore cable

Technical field

The invention belongs to technical field of construction, relate to a kind of long distance discrimination method of polycore cable.

Background technology

In underground coal mine or construction tunnel, often to lay the polycore cable of long distance for communication or control.Sometimes the colour recognition only leaning on cable core is insecure, even can shine into erroneous judgement or misconnection.Such as, in coal mine roadway, connect news cable and run into such problem: be blue at this end root signal wire of equipment, and find it is brown by repeatedly detecting here in pulpit.In practice, have joint in the middle of the cable of up to a hundred meters, same heart yearn two ends color difference is also possible.Sometimes cable two ends are distant, and middle spacer in addition, and one end of such as communication cable is on ground, and the other end, at underground coal mine, be found out every root line, and then connects correct, is not part a piece of cake.

In prior art, polycore cable differentiates method of testing as shown in Figure 1: a group of people is at one end by any two heart yearn short circuits, " 1 " on the left of cable number and " 2 " short circuit, another a group of people is at the other end, as the left side of cable in Fig. 1, by the two ends of instrument as multimeter searching short circuit, so blindly look for more time-consuming, and two ends all need personnel, each other by propagandaing directed to communicate or being undertaken linking up and exchanging by phone, very inconvenient.Classic method is more loaded down with trivial details, if during distance, must interknit, easily slip up by phone, and length consuming time.When without when giving cable connection in the tunnel of communication signal, due to cable two ends, workmen cannot get in touch, and wiring just becomes inconvenient, has difficulties.

Given this, find a kind of convenient, practical, simply, fast, efficiently, accurately polycore cable method of discrimination just to seem particularly necessity.

Summary of the invention

In order to solve the problems of the technologies described above, the invention provides a kind of long distance discrimination method of polycore cable, utilize the relevant knowledge of electric aspect and mathematical knowledge to combine, by popularization and the use of the method, practical problems in real solution engineering, efficiently, fast completes identification and the wiring of polycore cable.

Its technical scheme is as follows:

A kind of long distance discrimination method of polycore cable, comprises the following steps:

The first step, according to the cross-sectional area S of the length L (unit: rice) of cable, the electricalresistivityρ (unit: ohm meter) of cable core selected materials and cable core (unit: square metre), utilizes formula r ₀=ρ × L ÷ S estimates resistance r ₀(unit: ohm);

Second step, chooses the test resistance m of configuration, as long as meet m > > r ₀, determine the value of N according to cable core sum Z, N=Z-1, and determine corresponding resistance R ₀, R ₁, R ₂, R ₃..., R _nvalue be respectively 0 × m, 1 × m, 2 × m, 3 × m ..., N × m;

3rd step, makes resistance one cable connector, and in cable one end polycore cable by 0,1,2,3 ..., N serial number connecting;

4th step, selects arbitrarily three heart yearns at the cable other end, if numbering is a _i, a _j, a _k, with multimeter measurement resistance value M between any two _ij, M _jk, M _ki, list equation successively and solve N _ij, N _jk, N _ki, and push over out conclusion formula.

(1) heart yearn numbering a _iwith a _j

1. the resistance between heart yearn is formed: (i × m+r ₀)+(j × m+r ₀)

2. measurement data: M _ij

3. data [rounding] are calculated: N _ij=[M _ij/ m]

(2) heart yearn numbering a _jwith a _k

1. the resistance between heart yearn is formed: (j × m+r ₀)+(k × m+r ₀)

2. measurement data: M _jk

3. data [rounding] are calculated: N _jk=[M _jk/ m]

(3) heart yearn numbering a _kwith a _i

1. the resistance between heart yearn is formed: (k × m+r ₀)+(i × m+r ₀)

2. measurement data: M _ki

3. data [rounding] are calculated: N _ki=[M _ki/ m]

Following three equations are obtained according to data above:

$\left\{\begin{array}{c}(i\×m+r_0)+(j\×m+r_0)=M_{\mathrm{ij}}\\ (j\×m+r_0)+(k\×m+r_0)=M_{\mathrm{jk}}\\ (k\×m+r_0)+(i\×m+r_0)=M_{\mathrm{ki}}\end{array}\right.$

Consider " m > > r0 ", obtain a new equation:

Afterwards, solve: (this conclusion is remembered, directly applies)

(conclusion formula) $\left\{\begin{array}{c}i=(N_{\mathrm{ij}}-N_{\mathrm{jk}}+N_{\mathrm{ki}})\÷2\\ j=(N_{\mathrm{ij}}+N_{\mathrm{jk}}-N_{\mathrm{ki}})\÷2\\ k=(-N_{\mathrm{ij}}+N_{\mathrm{jk}}+N_{\mathrm{ki}})\÷2\end{array}\right.$ (release conclusion) $\left\{\begin{array}{c}{a}_i=i\\ a_j=j\\ a_k=k\end{array}\right.$

5th step, utilizes conclusion formula above, and i, j, k numerical value solved is exactly corresponding cable core a _i, a _j, a _knumbering;

6th step, on this basis, uses a _i, a _j, a _kin any one (as a _i) with other any one a _ncombination, measures the resistance value M between them _in, calculate N through rounding _in=[M _in/ m], obtain n=N _in-i, n are exactly corresponding cable core a _nnumbering; By that analogy, a ₀, a ₁, a ₂, a ₃..., a _nnumbering all find out, thus correct wiring.

Compared with prior art, beneficial effect of the present invention:

The method of the invention usable range: in the tunnel in underground coal mine, road bridge construction or tunnel, more demonstrate its superiority in occasion this method of communication signal difference.

Resistance value due to cable metal heart yearn is general, and all very little (when such as length is about 1000 meters, core section is amassed when being 1 square millimeter, resistance r ₀for ohmage magnitude), as long as meet m > > r ₀, so the test resistance m=10K generally chosen.

" resistance-cable connector " that the present invention makes with test resistance m=10K, can reuse after producing once, be applicable to common all wireline tests.

Present invention saves personnel, resistance-cable connector cost of manufacture are low, greatly facilitate field engineering technician wiring and maintenance, speed is fast, efficiency is high.

Accompanying drawing explanation

Fig. 1 is that traditional polycore cable differentiates test pattern;

Fig. 2 is polycore cable schematic diagram;

Fig. 3 is that polycore cable differentiates test connection layout.

Embodiment

Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is described in more detail.

See Fig. 2, it is polycore cable schematic diagram.

The resistivity of table 1 common metal heart yearn is (with L=1000m, S=1 × 10 ^-6m ²for example)

As shown in Figure 3, the long distance discrimination method of polycore cable of the present invention comprises the following steps:

The first step, according to the cross-sectional area S of the length L (unit: rice) of cable, the electricalresistivityρ (unit: ohm meter) of cable core selected materials and cable core (unit: square metre), utilizes formula r ₀=ρ × L ÷ S estimates resistance r ₀(unit: ohm);

Second step, chooses the test resistance m of configuration (as long as meet m > > r ₀), determine the value (N=Z-1) of N according to cable core sum Z, and determine corresponding resistance R ₀, R ₁, R ₂, R ₃..., R _nvalue be respectively 0 × m, 1 × m, 2 × m, 3 × m ..., N × m;

3rd step, makes a resistance-cable connector, and in cable one end polycore cable by 0,1,2,3 ..., N serial number connecting;

4th step, selects arbitrarily three heart yearns at the cable other end, if numbering is a _i, a _j, a _k, with multimeter measurement resistance value M between any two _ij, M _jk, M _ki, list equation successively and solve N _ij, N _jk, N _ki, and push over out conclusion formula.

(1) heart yearn numbering a _iwith a _j

1. the resistance between heart yearn is formed: (i × m+r ₀)+(j × m+r ₀)

2. measurement data: M _ij

3. data [rounding] are calculated: N _ij=[M _ij/ m]

(2) heart yearn numbering a _jwith a _k

1. the resistance between heart yearn is formed: (j × m+r ₀)+(k × m+r ₀)

2. measurement data: M _jk

3. data [rounding] are calculated: N _jk=[M _jk/ m]

(3) heart yearn numbering a _kwith a _i

1. the resistance between heart yearn is formed: (k × m+r ₀)+(i × m+r ₀)

2. measurement data: M _ki

3. data [rounding] are calculated: N _ki=[M _ki/ m]

Following three equations are obtained according to data above:

$\left\{\begin{array}{c}(i\×m+r_0)+(j\×m+r_0)=M_{\mathrm{ij}}\\ (j\×m+r_0)+(k\×m+r_0)=M_{\mathrm{jk}}\\ (k\×m+r_0)+(i\×m+r_0)=M_{\mathrm{ki}}\end{array}\right.$

Consider " m > > r ₀", obtain a new equation:

Afterwards, solve: (this conclusion is remembered, directly applies)

(conclusion formula) $\left\{\begin{array}{c}i=(N_{\mathrm{ij}}-N_{\mathrm{jk}}+N_{\mathrm{ki}})\÷2\\ j=(N_{\mathrm{ij}}+N_{\mathrm{jk}}-N_{\mathrm{ki}})\÷2\\ \end{array}\right.$ (release conclusion) $\left\{\begin{array}{c}{a}_i=i\\ a_j=j\\ \end{array}\right.$

k＝(-N _ij+N _jk+N _ki)÷2a _k＝k

5th step, utilizes conclusion formula above, and i, j, k numerical value solved is exactly corresponding cable core a _i, a _j, a _knumbering;

6th step, on this basis, uses a _i, a _j, a _kin any one (as a _i) with other any one a _ncombination, measures the resistance value M between them _in, calculate N through rounding _in=[M _in/ m], obtain n=N _in-i, n are exactly corresponding cable core a _nnumbering; By that analogy, a ₀, a ₁, a ₂, a ₃..., a _nnumbering all find out, thus correct wiring.

[applicating example] (every core cable is 2 square millimeters, electricalresistivityρ=1.75 × 10 of copper conductor with the 10 core cables of one 200 meters long ^-8Ω m) introduced for example.

Known conditions: L=200 rice, S=2 × 10 ^-6square metre, ρ=1.75 × 10 ^-8ohm meter, N=9

The first step, estimation r ₀=ρ × L ÷ S=(1.75 × 10 ^-8) × 200 ÷ (2 × 10 ^-6)=1.75 Ω;

Second step, chooses the test resistance m of configuration (as long as meet m > > r ₀): choose m=10K, corresponding resistance a ₀, a ₁, a ₂, a ₃..., a ₉value be respectively 0,10K, 20K, 30K ..., 90K;

3rd step, makes " resistance-cable connector ", and connects with cable one end; The numbering that the heart yearn connected with resistance 0,10K, 20K, 30K ..., 90K is corresponding is 0 successively, 1,2,3 ..., 9;

4th step, looks for arbitrarily three heart yearns at the cable other end, and its resistance value is tested in combination of two test respectively;

Resistance value (example) between table 2 three heart yearns

5th step, utilizes conclusion formula above, can calculate i=5, j=8, k=3; These three lines are corresponding is respectively No. 5, No. 8, No. 3 line on the left side;

6th step, finds the numbering of all the other the end of a thread successively, thus correct wiring.

The above, be only best mode for carrying out the invention, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses, and the simple change of the technical scheme that can obtain apparently or equivalence are replaced and all fallen within the scope of protection of the present invention.

Claims (1)

1. the long distance discrimination method of polycore cable, is characterized in that, comprise the following steps:

The first step, according to the cross-sectional area S of the length L of cable, the electricalresistivityρ of cable core selected materials and cable core, utilizes formula r ₀=ρ × L ÷ S estimates resistance r ₀;

Second step, chooses the test resistance m of configuration, m > > r ₀, determine the value of N according to cable core sum Z, N=Z-1, and determine corresponding resistance R ₀, R ₁, R ₂, R ₃..., R _nvalue be respectively 0 × m, 1 × m, 2 × m, 3 × m ..., N × m;

3rd step, makes a resistance-cable connector, and in cable one end polycore cable by 0,1,2,3 ..., N serial number connecting;

4th step, selects arbitrarily three heart yearns at the cable other end, if numbering is a _i, a _i, a _k, with multimeter measurement resistance value M between any two _ij, M _jk, M _ki, list equation successively and solve N _ij, N _jk, N _ki, and derive conclusion formula:

(1) heart yearn numbering a _iwith a _j

1. the resistance between heart yearn is formed: (i × m+r ₀)+(j × m+r ₀)

2. measurement data: M _ij

3. calculate data, round: N _ij=[M _ij/ m]

(2) heart yearn numbering a _jwith a _k

1. the resistance between heart yearn is formed: (j × m+r ₀)+(k × m+r ₀)

2. measurement data: M _jk

3. calculate data, round: N _jk=[M _jk/ m]

(3) heart yearn numbering a _kwith a _i

1. the resistance between heart yearn is formed: (k × m+r ₀)+(i × m+r ₀)

2. measurement data: M _ki

3. calculate data, round: N _ki=[M _ki/ m]

Following three equations are obtained according to data above:

$\left\{\begin{array}{c}(i\×m+r_0)+(j\×m+r_0)=M_{\mathrm{ij}}\\ (j\×m+r_0)+(k\×m+r_0)=M_{\mathrm{jk}}\\ (k\×m+r_0)+(i\×m+r_0)=M_{\mathrm{ki}}\end{array}\right.$

Consider " m > > r0 ", obtain a new system of equations:

Afterwards, solve:

Conclusion formula $\left\{\begin{array}{c}i=(N_{\mathrm{ij}}-N_{\mathrm{jk}}+N_{\mathrm{ki}})\÷2\\ j=(N_{\mathrm{ij}}+N_{\mathrm{jk}}-N_{\mathrm{ki}})\÷2\\ k=(-N_{\mathrm{ij}}+N_{\mathrm{jk}}+N_{\mathrm{ki}})\÷2\end{array}\right.$ Release conclusion $\left\{\begin{array}{c}{a}_i=i\\ a_j=j\\ a_k=k\end{array}\right.$

5th step, utilizes the conclusion formula of the 4th step, and i, j, k numerical value solved is exactly corresponding cable core a _i, a _j, a _knumbering;

6th step, uses a _i, a _j, a _kin any one and any one other a _ncombination, measures the resistance value M between them _in, calculate N through rounding _in=[M _in/ m], obtain n=N _in-i, n are exactly corresponding cable core a _nnumbering; By that analogy, a ₀, a ₁, a ₂, a ₃..., a _nnumbering all find out, thus correct wiring.