CN201945660U - On-and-off detector for multi-type cable - Google Patents

On-and-off detector for multi-type cable Download PDF

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Publication number
CN201945660U
CN201945660U CN2011200165330U CN201120016533U CN201945660U CN 201945660 U CN201945660 U CN 201945660U CN 2011200165330 U CN2011200165330 U CN 2011200165330U CN 201120016533 U CN201120016533 U CN 201120016533U CN 201945660 U CN201945660 U CN 201945660U
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CN
China
Prior art keywords
cable
test circuit
test
power supply
variable power
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Expired - Fee Related
Application number
CN2011200165330U
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Chinese (zh)
Inventor
赵彤
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赵彤
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Priority to CN2011200165330U priority Critical patent/CN201945660U/en
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Publication of CN201945660U publication Critical patent/CN201945660U/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The utility model discloses an on-and-off detector for a multi-type cable, which is used for testing the on-and-off of different types of cables; a test circuit of the detector is connected with a variable power supply, a direct current ammeter and a detected cable respectively, wherein the variable power supply supplies a variable direct electromotive force to the test circuit; the direct current ammeter displays the current in the test circuit; and the test circuit is connected with two ends of a detected cable so as to be used for testing the on-and-off condition of the detected cable in a high current situation. The on-and-off detector for a multi-type cable can improve the accuracy of the on-and-off test of a cable.

Description

Polymorphic type cable break-make detecting device
Technical field
The utility model relates to polytype cable break-make checkout equipment, particularly polymorphic type cable break-make detecting device.
Background technology
At present, the test cable break-make generally adopts the multimeter test, and measuring current is several milliamperes to tens milliamperes, and the special-purpose on off test equipment at the communication cable design is also arranged, and measuring current is littler.Because when little electric current and greatly contact resistance is different during electric current.Adopt little testing current break-make if be operated in the power cable of big electric current, occur false judgment easily.Single cable break-make checkout equipment is just effective during to a kind of cable and certain-length; But during to the cable detection of different model, different length, because the variation of cable resistance, single power supply can not satisfy the high current requirements when detecting, thereby reduces the precision that detects.
Summary of the invention
The purpose of this utility model is for solving the deficiencies in the prior art, providing a kind of to carry out the checkout equipment of polymorphic type cable on off test greater than 1 ampere high electric current.
The purpose of this utility model realizes by following measure: a kind of polymorphic type cable break-make detecting device, be used for various classification cable break-makes are carried out big current detecting, and test circuit connects variable power supply, DC ammeter, tested cable respectively, wherein:
Variable power supply is connected to test circuit, and being used for provides variable direct electromotive force. to test circuit.
DC ammeter is used for the electric current of test circuit.
Test circuit is connected the two ends of tested cable, is used to test the break-make of tested cable under high current conditions.
Above-mentioned test circuit comprises that the positive pole of variable power supply E1 connects after the reometer A end to switch S 1, the be connected in series positive pole of electric horn HA1 of the other end of switch S 1; The negative pole of the negative pole of electric horn HA1 and the variable power supply E1 test lead that partners is connected respectively to the two ends of tested cable Rx during test.
In the technique scheme, because having adopted test circuit is the series circuit that switch, electric horn and tested cable constitute, mode by voltage regulation of electric power sources and detect in real time to provide with reometer and surpass 1 ampere measuring current to tested cable, the big measuring current that surpasses 1 ampere when tested cable defectiveness or loose contact can make defect point or loose contact point increase because of temperature rise causes resistance, because of dividing potential drop or current limliting cause electric horn not ring, thereby the defective of testing out or loose contact, thereby improved the accuracy of on off test.
Description of drawings
Accompanying drawing of the present utility model comprises:
Fig. 1 is an entire block diagram of the present utility model.
Fig. 2 is the circuit diagram of test circuit of the present utility model.
Embodiment
Embodiment: seeing figures.1.and.2 is an embodiment of the present utility model.A kind of polymorphic type cable break-make detecting device, be used for different classes of cable break-make is carried out big current detecting, test circuit connects variable power supply, DC ammeter, tested cable respectively, and wherein: variable power supply is connected to test circuit, is used for providing variable direct electromotive force. to test circuit; DC ammeter is used for the electric current of test circuit; Test circuit is connected the two ends of tested cable, is used to test the break-make of tested cable under high current conditions.
Above-mentioned test circuit comprises that the positive pole of variable power supply E1 connects after the reometer end to switch S 1, the be connected in series positive pole of electric horn HA1 of the other end of switch S 1; The negative pole of the negative pole of electric horn HA1 and the variable power supply E1 test lead that partners is connected respectively to the two ends of tested cable Rx during test.
At first at different cables (material, length, diameter):
Provide following computing formula: the direct current resistance=resistance coefficient of per 1 km * 1000 ÷ sectional area (square millimeter) Europe/1000 meters.
Resistance coefficient: wherein when temperature T=20 ℃, the resistance coefficient of copper is 0.0175 Europe square millimeter/rice; The resistance coefficient of aluminium is 0.0283 Europe square millimeter/rice.
Wherein when temperature T=75 ℃, the resistance coefficient of copper is 0.0217 Europe square millimeter/rice; The resistance coefficient of aluminium is 0.0346 Europe square millimeter/rice.
For example calculate with 1.5 square millimeters of copper cores (environment temperature is 20 ℃):
0.0175 * 1000 ÷ 1.5 ≈ 11.667(Europe/1000 meters).
By as can be known shown in Figure 1, this cable break-make detecting device is used for the break-make of tested cable is carried out high current detecting, and variable power supply is connected to test circuit, and DC ammeter is connected to test circuit, and test circuit is connected the two ends of tested cable.
Comprised by test circuit shown in Figure 2: the positive pole of variable power supply E connects after the reometer A end to switch S 1, the be connected in series positive pole of electric horn HA1 of the other end of switch S 1; The negative pole of the negative pole of electric horn HA1 and the variable power supply E1 test lead that partners is connected respectively to the two ends of tested cable Rx during test.When the electric current of the electric horn HA1 that flows through just can be rung greater than 1 ampere-hour electric horn HA1, the scope of variable voltage source is 0 to 100 volt, electric current is 1 ampere-hour electric horn begin to ring (electric horn 5 Europe), at first we are transferred to a lower value with voltage, two test leads are connected tested cable, observe reometer this moment, increase voltage up to the registration of reometer up to 1 ampere or heard that just electric horn rings, this moment, we had a look the registration of voltage source, as above Li registration (1.5 square millimeters of copper cores of 1 km), when our sense data is 16 volts between 17 volts the time, illustrate that this cable can use, be normal cable, if instead registration is very big, illustrating that this cable has damaged needs to upgrade.

Claims (2)

1. a polymorphic type cable break-make detecting device is used for various classification cable break-makes are carried out big current detecting, it is characterized in that test circuit connects variable power supply, DC ammeter, tested cable respectively, wherein:
Variable power supply is connected to test circuit, and being used for provides variable direct electromotive force. to test circuit;
DC ammeter is used for the electric current of test circuit;
Test circuit is connected the two ends of tested cable, is used to test the break-make of tested cable under high current conditions.
2. polymorphic type cable break-make detecting device according to claim 1, the positive pole that it is characterized in that variable power supply E1 in the described test circuit connect an end that is connected to switch S 1 after the reometer A, the be connected in series positive pole of electric horn HA1 of the other end of switch S 1; The negative pole of the negative pole of electric horn HA1 and the variable power supply E1 test lead that partners is connected respectively to the two ends of tested cable Rx.
CN2011200165330U 2011-01-19 2011-01-19 On-and-off detector for multi-type cable Expired - Fee Related CN201945660U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200165330U CN201945660U (en) 2011-01-19 2011-01-19 On-and-off detector for multi-type cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200165330U CN201945660U (en) 2011-01-19 2011-01-19 On-and-off detector for multi-type cable

Publications (1)

Publication Number Publication Date
CN201945660U true CN201945660U (en) 2011-08-24

Family

ID=44473000

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2011200165330U Expired - Fee Related CN201945660U (en) 2011-01-19 2011-01-19 On-and-off detector for multi-type cable

Country Status (1)

Country Link
CN (1) CN201945660U (en)

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GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20110824

Termination date: 20120119