CN209215523U - A kind of cable mix line fault test circuit - Google Patents
A kind of cable mix line fault test circuit Download PDFInfo
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- CN209215523U CN209215523U CN201822073332.9U CN201822073332U CN209215523U CN 209215523 U CN209215523 U CN 209215523U CN 201822073332 U CN201822073332 U CN 201822073332U CN 209215523 U CN209215523 U CN 209215523U
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Abstract
The utility model belongs to cable detection technical field, is related to a kind of cable mix line fault test circuit.It includes fixed resistance, the first variable resistance, the first measured resistance, the second measured resistance, first lead end, the second lead end, third lead end, galvanometer and power supply.When adding survey using mix line fault point of this test circuit to cable fault circuit, it can substantially reduce the influence of swinging cross point contact resistance in test process, to the cable detection of 1km, error can be controlled in 10m.
Description
Technical field
The utility model belongs to cable detection technical field, is related to a kind of cable mix line fault test circuit.
Background technique
The most common method of test cable mix line fault is using wheatstone bridge tester, the fault test electricity of electric bridge at present
Road as shown in Figure 1, using bridge test cable loop both ends D.C. resistance, further according to the D.C. resistance and conductor length of conducting wire
The method of direct ratio calculates the position of swinging cross point.In Fig. 1, X, Y are the fixtures of bridge test lead, and R1, R2 are two equal in magnitude
Fixed resistance, R3 is the display resistance of variable resistance and instrument, RXIt is measured resistance, when bridge balance, passes through electric current
The electric current of table is zero, adjusts R3 value, when the electric current of ammeter is zero, R3 is equal with RX, and the numerical value that instrument is shown at this time is exactly
Measured resistance value.
Using this wheatstone bridge tester to the cable fault loop-around test process of Fig. 3 are as follows: first by lead end X, Y of instrument
It is clipped in A, B two o'clock in cable fault circuit respectively, measures back the conductor resistance R between A, BAB, then equally measure cable fault circuit
C, the conductor resistance R of D point-to-point transmissionCD, formula R is obtained using resistance is directly proportional to lengthAB/RCD=L1/L2, to find swinging cross event
Hinder the position of point.
But this test method is suitble to two conductors at swinging cross point to completely attach to, and the contact resistance at swinging cross point is zero or approaches
Zero the case where, i.e. RIt is mixed=0 or RIt is mixed<< RAB+RCD, and in fact, the resistance at swinging cross point is not zero more, sometimes than total electricity of conductor
Resistance is also much bigger, in this case, RAB/RCD≠L1/L2.Therefore, it is impossible to not find the position of mix line fault point with this method
It sets.
Utility model content
The purpose of this utility model is in view of the problems of the existing technology to provide a kind of reduction swinging cross point contact resistance shadow
Loud cable mix line fault tests circuit.
The specific technical solution of the utility model is as follows:
A kind of cable mix line fault test circuit, including fixed resistance, the first variable resistance, the first measured resistance, second
Measured resistance, first lead end, the second lead end, third lead end, galvanometer and power supply；The fixed resistance, first can be changed
Wheatstone bridge is formed after resistance, the first measured resistance, the connection of the second measured resistance；The first lead end is set to fixed resistance
With the public electric connecting terminal of the first variable resistance, second lead end is set to the first measured resistance and the second measured resistance
Public electric connecting terminal, the third lead end are set to the public electric connecting terminal of the second measured resistance and the first variable resistance；Institute
State galvanometer by conducting wire respectively with the public electric connecting terminal of fixed resistance and the first variable resistance, the first measured resistance and second
The public electric connecting terminal of measured resistance connects；
Further, it is provided with the second adjustable resistance in parallel with the galvanometer on the conducting wire of the connection galvanometer,
Based on protective current；
Further, the power supply can be changed with the public electric connecting terminal of fixed resistance and the first variable resistance, first respectively
Resistance is connect with the public electric connecting terminal of the second measured resistance, for powering.
The utility model has the following beneficial effects:
The utility model utilizes the equilibrium principle of resistance bridge, when the resistance of four walls of electric bridge reaches balance, or works as
It is zero by galvanometric electric current when the ratio of adjacent two walls resistance is equal.It dexterously will be unable to the swinging cross touched point simultaneously
Position be wired on galvanometer by another of swinging cross therewith, cable fault circuit is mixed using this test circuit
When line fault point adds survey, it can substantially reduce the influence of swinging cross point contact resistance in test process, to the cable detection of 1km, accidentally
Difference is can be controlled within the scope of 10m.
Detailed description of the invention
Fig. 1 is that existing cable mix line fault tests circuit；
Fig. 2 is the circuit connection diagram of the utility model；
Fig. 3 is cable fault circuit diagram；
In Fig. 3, AC, BD are the both threads core of cable loop: RIt is mixedFor the contact resistance at swinging cross point, L1、L2It is that swinging cross point arrives
The distance of cable ends head.
Specific embodiment
A kind of cable mix line fault as shown in Figure 2 tests circuit, including fixed resistance 1, the first variable resistance 2, first
Measured resistance 3, the second measured resistance 4, first lead end 5, the second lead end 6, third lead end 7, galvanometer 8 and power supply；Institute
Wheatstone bridge is formed after stating fixed resistance 1, the first variable resistance 2, the first measured resistance 3, the connection of the second measured resistance 4；It is described
First lead end 5 is set to the public electric connecting terminal of fixed resistance 1 and the first variable resistance 2, and second lead end 6 is set to
The public electric connecting terminal of first measured resistance 3 and the second measured resistance 4, the third lead end 7 are set to the second measured resistance 4
With the public electric connecting terminal of the first variable resistance 2；The galvanometer 8 respectively can power transformation with fixed resistance 1 and first by conducting wire
The public electric connecting terminal of resistance 2, the first measured resistance 3 are connect with the public electric connecting terminal of the second measured resistance 4；The connection electric current
The second adjustable resistance 9 in parallel with the galvanometer 8 is provided on the conducting wire of meter 8；The power supply respectively with fixed resistance 1 and
The public electric connecting terminal of one measured resistance 3, the first variable resistance 2 are connect with the public electric connecting terminal of the second measured resistance 4.
Cable fault circuit as shown in Figure 3 is detected using the cable mix line fault test circuit of the utility model
Detailed process is as follows:
As shown in figure 3, first lead end 5 is connect with A point, the second lead end 6 is connect with B point, third lead end 7 and C
Point connection, the first measured resistance 3 are equivalent to the resistance R of A, E point-to-point transmission conductorAE, the second measured resistance 4 is equivalent to C, E point-to-point transmission
The resistance R of conductorCE；After power supply is powered, the first variable resistance 2 is adjusted, makes galvanometer 8 zero, measures the value of the first measured resistance 3
For RX1, the value of the second measured resistance 4 of measurement is RX2, the value R of fixed resistance 10=10 Ω, at this point, RX1/RX2= R0/R1, and because
RX1/RX2=RAE/RCE=L1/L2, so, L2/L1= R1/R0, then L2/L1It is equal to 0.1 R1。
The cable mix line fault test circuit of the utility model can substantially reduce swinging cross point contact resistance in test process
Influence, to the cable detection of 1km, error is can be controlled within the scope of 10m.
Claims (3)
1. a kind of cable mix line fault tests circuit, it is characterised in that: including fixed resistance (1), the first variable resistance (2), the
One measured resistance (3), the second measured resistance (4), first lead end (5), the second lead end (6), third lead end (7), electric current
Count (8) and power supply；The fixed resistance (1), the first variable resistance (2), the first measured resistance (3), the second measured resistance (4) are even
Wheatstone bridge is formed after connecing；The first lead end (5) is set to the common electrical of fixed resistance (1) Yu the first variable resistance (2)
Connecting pin, second lead end (6) are set to the public electric connecting terminal of the first measured resistance (3) Yu the second measured resistance (4),
The third lead end (7) is set to the public electric connecting terminal of the second measured resistance (4) and the first variable resistance (2)；The electricity
Flowmeter (8) by conducting wire respectively with the public electric connecting terminal of fixed resistance (1) and the first variable resistance (2), the first measured resistance
(3) it is connect with the public electric connecting terminal of the second measured resistance (4).
2. a kind of cable mix line fault as described in claim 1 tests circuit, it is characterised in that: the connection galvanometer (8)
Conducting wire on be provided with the second adjustable resistance in parallel with the galvanometer (8) (9).
3. a kind of cable mix line fault as described in claim 1 tests circuit, it is characterised in that: the power supply respectively with fixation
Resistance (1) and public electric connecting terminal, the first variable resistance (2) of the first measured resistance (3) are public with the second measured resistance (4)
Electric connecting terminal connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822073332.9U CN209215523U (en) | 2018-12-11 | 2018-12-11 | A kind of cable mix line fault test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822073332.9U CN209215523U (en) | 2018-12-11 | 2018-12-11 | A kind of cable mix line fault test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209215523U true CN209215523U (en) | 2019-08-06 |
Family
ID=67463902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822073332.9U Active CN209215523U (en) | 2018-12-11 | 2018-12-11 | A kind of cable mix line fault test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209215523U (en) |
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2018
- 2018-12-11 CN CN201822073332.9U patent/CN209215523U/en active Active
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