CN203191502U - Test device for electric power cable - Google Patents
Test device for electric power cable Download PDFInfo
- Publication number
- CN203191502U CN203191502U CN 201320180532 CN201320180532U CN203191502U CN 203191502 U CN203191502 U CN 203191502U CN 201320180532 CN201320180532 CN 201320180532 CN 201320180532 U CN201320180532 U CN 201320180532U CN 203191502 U CN203191502 U CN 203191502U
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- resistance
- effect transistor
- field effect
- triode
- nmos field
- Prior art date
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Abstract
The utility model discloses a test device for an electric power cable. The test device comprises an NMOS (N-channel metal oxide semiconductor) field effect transistor, a triode, a first resistor, a second resistor, a third resistor, a light-emitting diode, a switch and a direct-current power supply. The test device disclosed by the utility model is capable of testing the position of the core breakage of a conductive wire and reducing the waste rate of insulation wires, few in the used components, simple in circuit structure, convenient to use, low in cost, and beneficial to popularize.
Description
Technical field
The utility model relates to a kind of tracerse survey device, relates in particular to a kind of electric power cable proving installation.
Background technology
When using various electrical appliances or family expenses electric wire, run into the situation of electric wire fracture through regular meeting, often have no idea to know the position of broken string somewhere, for the insulated conductor of the disconnected core in inside or be installed within the walls cable, the cable of inner disconnected core is often passed into disuse, this is very unfortunate, if can determine disconnected core position, just can repair; Be installed in the particular location that within the walls cable then is not easy to detect fault, increase the difficulty of maintenance.
Summary of the invention
The purpose of this utility model provides a kind of electric power cable proving installation with regard to being in order to address the above problem.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises the NMOS field effect transistor, triode, first resistance, second resistance, the 3rd resistance, light emitting diode, switch and direct supply, the source electrode of described NMOS field effect transistor is connected with the emitter of described triode and the negative pole of described direct supply respectively, the base stage of described triode is connected with the drain electrode of described NMOS field effect transistor by described the 3rd resistance, the two ends of described first resistance are connected with the drain electrode of described NMOS field effect transistor and an end of described switch respectively, the other end of described switch is connected with dc power anode, the collector of described triode is connected with the negative pole of described light emitting diode, the positive pole of described light emitting diode is connected with an end of described second resistance, the other end of described second resistance is connected with an end of described switch, and the grid of described NMOS field effect transistor is unsettled; Described triode is NPN type triode; The voltage of described direct supply is 3V, and described first resistance is 3.3 kilo-ohms, and described second resistance is 22 Europe, and described the 3rd resistance is 371 kilo-ohms.
The beneficial effects of the utility model are:
The utility model can be measured the position of the disconnected core of lead easily, has significantly reduced the discarded rate of insulated wire, and simple structure, easy to use, cost is low, being applied to industry-by-industry or home circuit can both save unnecessary expenses; And can detect the guilty culprit position easily and fast for the cable that is installed within the walls, convenient maintenance.
Description of drawings
Fig. 1 is the utility model circuit structure schematic diagram.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing:
As shown in Figure 1: the utility model comprises NMOS field effect transistor VT1, triode VT2, first resistance R 1, second resistance R 2, the 3rd resistance R 3, light emitting diode VD, switch S A and direct supply, the source S of NMOS field effect transistor VT1 is connected with the emitter of triode VT2 and the negative pole of direct supply respectively, the base stage of triode VT2 is connected with the drain D of NMOS field effect transistor VT1 by the 3rd resistance R 3, the two ends of first resistance R 1 are connected with the drain electrode of NMOS field effect transistor VT1 and the end of switch S A respectively, the other end of switch S A is connected with dc power anode, the collector of triode VT2 is connected with the negative pole of light emitting diode VD, the positive pole of light emitting diode VD is connected with an end of second resistance R 2, the other end of second resistance R 2 is connected with the end of switch S A, and the grid G of NMOS field effect transistor VT1 is unsettled; Triode is NPN type triode; The voltage of direct supply is 3V, and first resistance is 3.3 kilo-ohms, and second resistance is 22 Europe, and the 3rd resistance is 371 kilo-ohms.
As shown in Figure 1: circuit of the present utility model is to form a kind of test pencil circuit with NMOS field effect transistor VT1, it can measure the disconnected core position of lead easily, during measurement, the phase line of tested lead one termination AC power, the other end is unsettled, SA closes a switch, then that the probe of induction test pencil is also mobile near tested lead, because the input impedance of NMOS field effect transistor VT1 is very high, enlargement factor is very big, so as long as grid G is sensed faint voltage signal, just can cause the marked change of drain electrode S electric current, drain electrode S electric current amplifies by triode again, is enough to make light emitting diode VD luminous.If when being checked through a certain position from top to bottom, light emitting diode VD extinguishes suddenly, then lead location of living in is disconnected core place.
Claims (1)
1. electric power cable proving installation, it is characterized in that: comprise the NMOS field effect transistor, triode, first resistance, second resistance, the 3rd resistance, light emitting diode, switch and direct supply, the source electrode of described NMOS field effect transistor is connected with the emitter of described triode and the negative pole of described direct supply respectively, the base stage of described triode is connected with the drain electrode of described NMOS field effect transistor by described the 3rd resistance, the two ends of described first resistance are connected with the drain electrode of described NMOS field effect transistor and an end of described switch respectively, the other end of described switch is connected with dc power anode, the collector of described triode is connected with the negative pole of described light emitting diode, the positive pole of described light emitting diode is connected with an end of described second resistance, the other end of described second resistance is connected with an end of described switch, and the grid of described NMOS field effect transistor is unsettled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320180532 CN203191502U (en) | 2013-04-11 | 2013-04-11 | Test device for electric power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320180532 CN203191502U (en) | 2013-04-11 | 2013-04-11 | Test device for electric power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203191502U true CN203191502U (en) | 2013-09-11 |
Family
ID=49108354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320180532 Expired - Fee Related CN203191502U (en) | 2013-04-11 | 2013-04-11 | Test device for electric power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203191502U (en) |
-
2013
- 2013-04-11 CN CN 201320180532 patent/CN203191502U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20140411 |