CN203376382U - Leakage current detection apparatus - Google Patents
Leakage current detection apparatus Download PDFInfo
- Publication number
- CN203376382U CN203376382U CN201320470880.XU CN201320470880U CN203376382U CN 203376382 U CN203376382 U CN 203376382U CN 201320470880 U CN201320470880 U CN 201320470880U CN 203376382 U CN203376382 U CN 203376382U
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- signal
- leakage current
- current
- leakage
- magnetic core
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Abstract
The utility model discloses a leakage current detection apparatus. The apparatus comprises an annular magnetic core. A live wire and a neutral wire pass through the annular magnetic core and are taken as primary coils. The annular magnetic core is wound with a secondary coil. The secondary coil is connected with a signal amplification circuit. The signal amplification circuit is connected with a signal comparison circuit. The signal comparison circuit is connected with a leakage current signal indication needle. The annular magnetic core is provided with a shielding cover. According to the apparatus of the utility model, the shielding cover is arranged on the annular magnetic core; through the shielding cover, the interference by an interference current and an external magnetic field is effectively avoided; high precision and high stability during measurement are ensured. Simultaneously, an electric leakage signal is amplified by the signal amplification circuit and is compared by the signal comparison circuit. If a current exceeds a certain set value, the leakage current signal indication needle indicates that there is the leakage current. If there is no current or the current does not exceed the certain set value, the leakage current signal indication needle does not generate changes, which means that there is no leakage current. Therefore, the leakage current signal can be detected when being in a weak state.
Description
Technical field
The utility model relates to a kind of leak current detection device.
Background technology
The principle of now general leakage detector detection leakage current as shown in Figure 1, live wire and center line, namely the wire of output current and input current is simultaneously through a toroidal core, primary coil as creepage mutual inductor, produce magnetic field according to the electric current changed, if the system electric leakage, the electric leakage secondary coil can be exported electric leakage signal.Electric current from the power supply input, after the system of whole loads of flowing through, return to the branch current of line end in power supply, and when this branch road does not have ground current, output current should equate fully with input current do not have electric leakage signal to produce; And, when electric leakage occurs system, the earth leakage electric current appears in supposing the system, input current now and output current are by unequal, and its resultant current is exactly leakage current.
But in actual measurement, thereby owing to often having interference current on circuit and magnetic field makes electric current unstable, thereby make the leakage current of secondary coil output precisely not unstable, affected detection and the judgement of electric leakage signal; The leakage current signal sometimes makes pick-up unit that undetected possibility be arranged a little less than in addition.
Summary of the invention
The purpose of this utility model is to provide a kind of leak current detection device, can record leakage current more precisely, more stable.
The utility model solves the problems of the technologies described above by following technical proposals:
A kind of leak current detection device, comprise toroidal core, live wire and center line pass toroidal core as primary coil, toroidal core also is wound with secondary coil, secondary coil connects signal amplification circuit, signal amplification circuit connects signal comparator circuit, and signal comparator circuit connects leakage current signal designation pin, on described toroidal core, is provided with radome.
The utility model leak current detection device adopts radome is set on toroidal core, effectively avoid interference the interference of electric current and external magnetic field by radome, high precision while having guaranteed to measure, high stability, high reliability, the amplification through signal amplification circuit for electric leakage signal simultaneously, pass through again the comparison of signal comparator circuit, if electric current surpasses certain setting value, the indication of leakage current signal pointer has leakage current generating, if do not have electric current or electric current to be no more than certain setting value, leakage current signal pointer does not change, showing does not have leakage current, like this can be so that the leakage current signal also can detect in weak, and the value that can set qualitatively leakage current is avoided undetected possibility.
The accompanying drawing explanation
Fig. 1 is the existing schematic diagram of measuring electric leakage device.
Fig. 2 is schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 2, a kind of leak current detection device, comprise toroidal core, live wire and center line pass toroidal core as primary coil, toroidal core also is wound with secondary coil, and secondary coil connects signal amplification circuit, and signal amplification circuit connects signal comparator circuit, signal comparator circuit connects leakage current signal designation pin, on described toroidal core, is provided with radome.
Live wire and center line, through toroidal core, are equivalent to be entangled in the primary coil on toroidal core, according to the electric current changed, produce magnetic field, if the system electric leakage, the electric leakage secondary coil can be exported electric leakage signal.Radome is set on toroidal core, and radome is the permalloy radome, and shield effectiveness is good, can effectively avoid interference the interference of electric current and external magnetic field, high precision, high stability, high reliability while having guaranteed to measure.Electric leakage signal is after secondary coil picks out, first pass through the amplification of signal amplification circuit, through the signal input signal comparator circuit after amplifying, if the current signal of input surpasses certain setting value (reference current or the voltage of this setting value for reserving in advance), the skew indication just occurs leakage current signal pointer leakage current generating, if do not have electric current or electric current to be no more than certain setting value, leakage current signal pointer does not change, showing does not have leakage current, like this can be so that the leakage current signal also can detect in weak, and the value that can set qualitatively leakage current is avoided undetected possibility.
Claims (1)
1. a leak current detection device, comprise toroidal core, it is characterized in that, live wire and center line pass toroidal core as primary coil, toroidal core also is wound with secondary coil, and secondary coil connects signal amplification circuit, and signal amplification circuit connects signal comparator circuit, signal comparator circuit connects leakage current signal designation pin, on described toroidal core, is provided with radome.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320470880.XU CN203376382U (en) | 2013-08-02 | 2013-08-02 | Leakage current detection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320470880.XU CN203376382U (en) | 2013-08-02 | 2013-08-02 | Leakage current detection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203376382U true CN203376382U (en) | 2014-01-01 |
Family
ID=49838905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320470880.XU Expired - Fee Related CN203376382U (en) | 2013-08-02 | 2013-08-02 | Leakage current detection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203376382U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245040A (en) * | 2018-09-30 | 2019-01-18 | 德力西电气有限公司 | leakage protection circuit |
-
2013
- 2013-08-02 CN CN201320470880.XU patent/CN203376382U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109245040A (en) * | 2018-09-30 | 2019-01-18 | 德力西电气有限公司 | leakage protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140101 Termination date: 20170802 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |