CN203504144U - Electric leakage sampling circuit - Google Patents
Electric leakage sampling circuit Download PDFInfo
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- CN203504144U CN203504144U CN201320599978.5U CN201320599978U CN203504144U CN 203504144 U CN203504144 U CN 203504144U CN 201320599978 U CN201320599978 U CN 201320599978U CN 203504144 U CN203504144 U CN 203504144U
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Abstract
The utility model discloses an electric leakage sampling circuit. The electric leakage sampling circuit includes a zero sequence current transformer J1, a signal processor T1, a first stage amplification circuit U1A and a second stage amplification circuit U1B. The zero sequence current transformer J1 is used for inducting a leakage current; the signal processor T1 is used for processing the leakage current into an electric leakage signal; the first stage amplification circuit U1A is used for firstly amplifying the electric leakage signal to obtain a first amplified signal; and the second stage amplification circuit U1B is used for secondly amplifying the electric leakage signal to obtain a second amplified signal. By amplifying the electric leakage signal twice, the electric leakage sampling circuit can raise the precision of the electric leakage signal, the anti-interference performance and the stability.
Description
Technical field
The utility model relates to sample circuit field, relates in particular to a kind of electric leakage sample circuit for the reclosing open-circuit system that leaks electricity.
Background technology
The protection device of electric leakage reclosing circuit breaker Chang Zuowei circuit.As shown in Figure 1, electric leakage reclosing circuit breaker generally comprises: the parts such as power supply, three-phase independence full-bridge, micro-control unit, current sampling circuit, voltage sampling circuit, electric leakage sample circuit, keystroke handling circuit, Graphics Processing circuit and protection output.Electric leakage sample circuit is a very important part in electric leakage reclosing circuit breaker.Electric leakage sample circuit can carry out acquisition and processing by electric leakage signal, and the micro-control unit that then electric leakage signal is outputed to electric leakage reclosing circuit breaker is analyzed, and plays the effect to the real-time monitoring of circuit.
The electric leakage sample circuit of existing electric leakage reclosing circuit breaker only has one-level to amplify processing after mostly being sampling, and this sample circuit precision is not high, poor anti jamming capability, and waveform is unstable.
Utility model content
In view of this, the utility model provides a kind of electric leakage sample circuit and electric leakage reclosing open-circuit system, on the basis of the electric leakage sample circuit of original electric leakage reclosing open-circuit system, increased one-level amplification, from one-level, amplify and become secondary amplification, reach the object of the precision, antijamming capability and the stability that improve the electric leakage signal collecting.
On the one hand, the utility model provides a kind of electric leakage sample circuit, and described circuit comprises:
Zero sequence current mutual inductor J1 is used for responding to leakage current;
Signal processor T1 is for being processed into electric leakage signal by described leakage current;
First order amplifying circuit U1A, for described electric leakage signal is amplified to processing for the first time, obtains the first amplifying signal;
Second level amplifying circuit U1B, for described the first amplifying signal is amplified to processing for the second time, obtains the second amplifying signal.
Accordingly, the utility model has also proposed a kind of electric leakage reclosing open-circuit system, and wherein, described electric leakage reclosing open-circuit system comprises the electric leakage sample circuit that the utility model any embodiment provides.
The utility model proposes a kind of electric leakage sample circuit and electric leakage reclosing open-circuit system, can improve precision, antijamming capability and the stability of the electric leakage signal collecting.
Accompanying drawing explanation
Fig. 1 is the block diagram of electric leakage reclosing circuit breaker.
Fig. 2 is the structural representation of the electric leakage sample circuit that provides of the utility model the first embodiment.
Embodiment
In order to make technical problem that the utility model solves,, the technical scheme of employing and the technique effect that reaches are clearer, below in conjunction with drawings and Examples, the utility model is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the utility model, but not to restriction of the present utility model.It also should be noted that, for convenience of description, in accompanying drawing, only show the part relevant to the utility model but not full content.Below in conjunction with accompanying drawing and by embodiment, further illustrate the technical solution of the utility model.
Embodiment mono-
Fig. 2 is the structural representation of the electric leakage sample circuit that provides of the utility model the first embodiment.As shown in Figure 2, the electric leakage sample circuit that the present embodiment provides comprises:
Zero sequence current mutual inductor J1.
In the utility model embodiment, the first lead-out terminal of described zero sequence current mutual inductor J1 is connected with the anode of the second diode D2 with the first pole plate of described the first capacitor C1, the negative electrode of the first terminal of the first resistor R1, the first diode D1.The second output end ground connection of described zero sequence current mutual inductor J1.Described zero sequence current mutual inductor J1 is used for responding to leakage current.When having leakage current generating, in zero sequence current mutual inductor J1, just have leakage current and flow through.
Signal processor T1.
In the utility model embodiment, described signal processor T1 comprises the first capacitor C1, the first resistor R1, the first diode D1 and the second diode D2 being connected in parallel, the first pole plate of wherein said the first capacitor C1, the first terminal of the first resistor R1, the negative electrode of the first diode D1 and the anodic bonding of the second diode D2 are to the first lead-out terminal of described zero sequence current mutual inductor J1, the second pole plate of described the first capacitor C1, the second terminal of the first resistor R1, the minus earth of the anode of the first diode D1 and the second diode D2.Described signal processor T1 is for being processed into electric leakage signal by described leakage current.In described zero sequence current mutual inductor J1, have leakage current through out-of-date, the two ends of the first resistor R1 can form voltage difference, and the first diode D1 and the second diode D2 have one all the time in conducting state, have one in cut-off state, play the effect of protective circuit.
First order amplifying circuit U1A.
In the utility model embodiment, the in-phase input end ground connection of described first order amplifying circuit U1A, the inverting input of described first order amplifying circuit U1A is connected in the first pole plate of described the first capacitor C1 by the second resistor R2, the negative electrode of the first terminal of the first resistor R1, the first diode D1 and the anode of the second diode D2, and the output of described first order amplifying circuit U1A is connected in the anode of the 3rd diode D3.Described first order amplifying circuit U1A, for electric leakage signal is amplified to processing for the first time, obtains the first amplifying signal, and described the first amplifying signal is delivered to described second level amplifying circuit U1B.
Second level amplifying circuit U1B.
In the utility model embodiment, the in-phase input end of described second level amplifying circuit U1B is connected to the negative electrode of described the 3rd diode D3, and by the 3rd resistor R3, be connected to the inverting input of described first order amplifying circuit U1A, the inverting input of described second level amplifying circuit U1B is by the 4th resistor R4 ground connection and by the output of the 5th resistor R5 connection and described second level amplifying circuit U1B.Described second level amplifying circuit U1B, for described the first amplifying signal is amplified to processing for the second time, obtains the second amplifying signal.
Preferably, the output of described second level amplifying circuit U1B is transferred to micro-control unit by RC circuit by described the second amplifying signal.
Preferably, described RC circuit comprises the 6th resistor R6 and the 3rd capacitor C3, the first terminal of described the 6th resistor R6 is connected in the output of described second level amplifying circuit U1B, the first pole plate of described the 3rd capacitor C3 is connected in the second terminal of described the 6th resistor R6, the second pole plate ground connection of described the 3rd capacitor C3.
The utility model also provides a kind of electric leakage reclosing open-circuit system; this electric leakage reclosing open-circuit system comprises power supply, three-phase independence full-bridge, micro-control unit, current sampling circuit, voltage sampling circuit, electric leakage sample circuit, keystroke handling circuit, Graphics Processing circuit and protection output; wherein, described electric leakage sample circuit adopts above-mentioned electric leakage sample circuit.
Note, foregoing is only preferred embodiment of the present utility model.Skilled person in the art will appreciate that the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection range of the present utility model.Therefore, although the utility model is described in further detail by above embodiment, but the utility model is not limited only to above embodiment, in the situation that not departing from the utility model design, can also comprise more other equivalent embodiment, and scope of the present utility model is determined by appended claim scope.
Claims (7)
1. an electric leakage sample circuit, is characterized in that, comprising: zero sequence current mutual inductor J1, signal processor T1, first order amplifying circuit U1A and second level amplifying circuit U1B, wherein,
Described zero sequence current mutual inductor J1 is used for responding to leakage current;
Described signal processor T1 is for being processed into electric leakage signal by described leakage current;
Described first order amplifying circuit U1A, for described electric leakage signal is amplified to processing for the first time, obtains the first amplifying signal;
Described second level amplifying circuit U1B, for described the first amplifying signal is amplified to processing for the second time, obtains the second amplifying signal.
2. electric leakage sample circuit according to claim 1, it is characterized in that, described signal processor T1 comprises: the first capacitor C1 being connected in parallel, the first resistor R1, the first diode D1 and the second diode D2, the first pole plate of wherein said the first capacitor C1, the first terminal of the first resistor R1, the anodic bonding of the negative electrode of the first diode D1 and the second diode D2 is to the first lead-out terminal of described zero sequence current mutual inductor J1, the second pole plate of described the first capacitor C1, the second terminal of the first resistor R1, the minus earth of the anode of the first diode D1 and the second diode D2.
3. electric leakage sample circuit according to claim 2, it is characterized in that, the in-phase input end ground connection of described first order amplifying circuit U1A, the inverting input of described first order amplifying circuit U1A is connected in the first pole plate of described the first capacitor C1 by the second resistor R2, the negative electrode of the first terminal of the first resistor R1, the first diode D1 and the anode of the second diode D2, and the output of described first order amplifying circuit U1A is connected in the anode of the 3rd diode D3.
4. electric leakage sample circuit according to claim 3, it is characterized in that, the in-phase input end of described second level amplifying circuit U1B is connected to the negative electrode of described the 3rd diode D3, and by the 3rd resistor R3, be connected to the inverting input of described first order amplifying circuit U1A, the inverting input of described second level amplifying circuit U1B is by the 4th resistor R4 ground connection and by the output of the 5th resistor R5 connection and described second level amplifying circuit U1B.
5. electric leakage sample circuit according to claim 4, is characterized in that, the output of described second level amplifying circuit U1B is transferred to micro-control unit by RC circuit by described the second amplifying signal.
6. electric leakage sample circuit according to claim 5, it is characterized in that, described RC circuit comprises the 6th resistor R6 and the 3rd capacitor C3, the first terminal of described the 6th resistor R6 is connected in the output of described second level amplifying circuit U1B, the first pole plate of described the 3rd capacitor C3 is connected in the second terminal of described the 6th resistor R6, the second pole plate ground connection of described the 3rd capacitor C3.
7. an electric leakage reclosing open-circuit system; comprise: power supply, three-phase independence full-bridge, micro-control unit, current sampling circuit, voltage sampling circuit, electric leakage sample circuit, keystroke handling circuit, Graphics Processing circuit and protection output, is characterized in that the circuit described in any one claim that described electric leakage sample circuit comprises claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320599978.5U CN203504144U (en) | 2013-09-26 | 2013-09-26 | Electric leakage sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320599978.5U CN203504144U (en) | 2013-09-26 | 2013-09-26 | Electric leakage sampling circuit |
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| Publication Number | Publication Date |
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| CN203504144U true CN203504144U (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320599978.5U Expired - Fee Related CN203504144U (en) | 2013-09-26 | 2013-09-26 | Electric leakage sampling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391162A (en) * | 2014-12-16 | 2015-03-04 | 南京凡瑞特软件有限公司 | Portable online residual current monitoring system |
-
2013
- 2013-09-26 CN CN201320599978.5U patent/CN203504144U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104391162A (en) * | 2014-12-16 | 2015-03-04 | 南京凡瑞特软件有限公司 | Portable online residual current monitoring system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140326 Termination date: 20210926 |