CN202975123U - Circuit for simultaneous monitoring residual current and breaker work state on same loop - Google Patents
Circuit for simultaneous monitoring residual current and breaker work state on same loop Download PDFInfo
- Publication number
- CN202975123U CN202975123U CN 201220678934 CN201220678934U CN202975123U CN 202975123 U CN202975123 U CN 202975123U CN 201220678934 CN201220678934 CN 201220678934 CN 201220678934 U CN201220678934 U CN 201220678934U CN 202975123 U CN202975123 U CN 202975123U
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- circuit
- resistance
- residual current
- operational amplifier
- circuit breaker
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Abstract
Disclosed in the utility model is a circuit for simultaneous monitoring a residual current and a breaker work state on a same loop. The circuit comprises: a residual current signal acquisition circuit, which is formed by successive series connection of a residual current measuring circuit, a differential amplifier circuit, and a bandpass filtering amplification circuit; a 2.048-V voltage source, which is connected with the residual current measuring circuit; a loop breaker state monitoring circuit; and a PCB board. Besides, the residual current signal acquisition circuit and the loop breaker state monitoring circuit are printed on the PCB board; the input terminal of the residual current signal acquisition circuit is adjacent to the input terminal of the loop breaker state monitoring circuit and is connected to a four-input terminal. According to the utility model, because two kinds of circuits are designed on the same PCB circuit board and the input terminals thereof are adjacent to each other, when simultaneous monitoring of multiple loops occurs, wiring terminals of all the loops can be distinguished, so that the maintenance and line inspection can be carried out easily.
Description
Technical field
The utility model relates to a kind ofly can monitor the residual current of the same circuit and the circuit of working state of circuit breaker simultaneously for multiloop fire hazard monitoring extension set.
Background technology
Existing multichannel residual current type detector for electric fire protection, generally on circuit design, concentrate together for making effective other function and the detecting function that make in circuit of utilizing in space, or will separate with the working state of circuit breaker monitoring function that detecting function matches, so just make the phenomenon that easily occurs the wiring confusion when multiloop is surveyed, can not distinguish when conducting transmission line maintenance simultaneously or the line inspection at once, and bring unnecessary trouble.
The utility model content
For the problems referred to above, the utility model purpose is to provide a kind ofly can monitor the residual current of the same circuit and the circuit of working state of circuit breaker simultaneously.
For addressing the above problem, the utility model adopts following technical scheme:
A kind of residual current of the same circuit and circuit of working state of circuit breaker monitored simultaneously is characterized in that comprising:
The residual current signal acquisition circuit is in series successively by residual current metering circuit, differential amplifier circuit, bandpass filtering amplifying circuit;
2.048V voltage source is connected with described residual current metering circuit;
The circuit breaker condition indication circuit;
Printed-wiring board (PWB), described residual current signal acquisition circuit and circuit breaker condition indication circuit are arranged on this printed-wiring board (PWB), the input end of the input end of described residual current signal acquisition circuit and circuit breaker status monitoring circuit is adjacent, and is connected on four-input terminal.
The utility model has the advantages that: to same printed-wiring board (PWB), and input adjacently two kinds of circuit design, when multiloop occurring and monitoring simultaneously, just be conducive to distinguish the connection terminal in each loop like this, make that maintenance, line become easily.
Description of drawings
Fig. 1 is voltage source circuit figure;
Fig. 2 is the residual current signal acquisition circuit;
Fig. 3 is circuit breaker status monitoring circuit.
Fig. 4 is the PCB wiring board;
Fig. 5 is the electric circuit constitute figure of the utility model embodiment.
Embodiment
The utility model relates to the residual current in loop and the working state of circuit breaker scheme of Centralized Monitoring simultaneously, comprising:
The residual current signal acquisition circuit is in series successively by residual current metering circuit, differential amplifier circuit, bandpass filtering amplifying circuit; 2.048V voltage source is connected with described residual current metering circuit; Circuit breaker status monitoring circuit; Printed-wiring board (PWB), described residual current signal acquisition circuit and circuit breaker status monitoring circuit are arranged on this printed-wiring board (PWB), the input end of the input end of described residual current signal acquisition circuit and circuit breaker status monitoring circuit is adjacent, and is connected on four-input terminal.
Further:
in described residual current signal acquisition circuit: the residual current metering circuit is comprised of residual current transformer and the first resistance, and the first resistance is in parallel with the output terminal of residual current transformer, and described 2.048V voltage source is connected with described current transformer, differential amplifier circuit is comprised of the first operational amplifier and the second resistance, the 3rd resistance, the 4th resistance, the front end of the second resistance and the 3rd resistance is connected to the two ends of the first resistance, the rear end of the second resistance and the 3rd resistance connects respectively the first operational amplifier positive-negative input end, is connected the 4th resistance between the negative input end of the first operational amplifier and output terminal, the bandpass filtering amplifying circuit is by the second operational amplifier and the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first electric capacity, the second electric capacity forms, the front end of the 6th resistance connects the output of differential amplifier circuit, the rear end of the 6th resistance connects respectively the second electric capacity, the 7th resistance, the output terminal of rear termination second operational amplifier of the second electric capacity, the positive input terminal of rear termination second operational amplifier of the 7th resistance, the first electric capacity is connected between the positive input terminal and ground of the second operational amplifier, the 8th resistance is connected between the negative input end and ground of the second operational amplifier, the 9th resistance is connected between the negative input end and output terminal of the second operational amplifier.
Described circuit breaker status monitoring circuit is comprised of optical coupler, and the input of optical coupler connects the monitoring loop auxiliary contacts of circuit breaker, and the output of optical coupler is transmitted the circuit breaker status signal to single-chip microcomputer.
Be described further below in conjunction with accompanying drawing.
As shown in Figure 1, circuit adopts reference source REF3020 and amplifier LM258 to form the voltage source that voltage follower circuit produces the low output impedance of a 2.048V.
Figure 2 shows that the residual current signal acquisition circuit.Wherein: residual current transformer and 2R1 form metering circuit; 2U1A and 2R2,2R3,2R4 form differential amplifier circuit; 2U1B and 2R6,2R7,2R9,2C3,2C4 form the bandpass filtering amplifying circuit.Measuring voltage is delivered to the La pin of single-chip microcomputer by 2R10 through twice amplification, single-chip microcomputer is processed data after the AD conversion.
Figure 3 shows that circuit breaker status monitoring circuit, it realizes by optocoupler 3U1,3R1,3R2, and FZ1 and GND connect respectively the two ends of institute's monitoring loop auxiliary contacts of circuit breaker.When isolating switch is in closure state, FZ1 and GND conducting (being 1, the 2 pin conductings of 3U1), 3, the 4 pin conductings of 3U1, FZSR1 passes to single-chip microcomputer breaker closing signal.
When generating PCB, on residual current signal acquisition circuit and circuit-breaker status indicating circuit typesetting to a pcb board, and the residual current input end of the same circuit is adjacent with the working state of circuit breaker input end, be connected on four-input terminal, 1. be 2. one group as shown in Figure 4,3. be 4. one group, 5. be 6. one group.
In an embodiment as shown in Figure 5, it comprises 3 identical loops.Residual current transformer in each loop and auxiliary contacts of circuit breaker are connected on four-input terminal, the auxiliary signal that the electric leakage signal of residual current signal acquisition circuit collection and auxiliary contacts of circuit breaker produce is connected on mainboard, and single chip circuit is housed on mainboard.
Above-mentioned embodiment of the present utility model is carried out detailed explanation, for those skilled in the art, can implement technical solutions of the utility model according to above-mentioned narration.
Claims (4)
1. monitor simultaneously the residual current of the same circuit and the circuit of working state of circuit breaker for one kind, it is characterized in that comprising:
The residual current signal acquisition circuit is in series successively by residual current metering circuit, differential amplifier circuit, bandpass filtering amplifying circuit;
2.048V voltage source is connected with described residual current metering circuit;
The circuit breaker condition indication circuit;
Printed-wiring board (PWB), described residual current signal acquisition circuit and circuit breaker condition indication circuit are arranged on this printed-wiring board (PWB), the input end of the input end of described residual current signal acquisition circuit and circuit breaker status monitoring circuit is adjacent, and is connected on four-input terminal.
2. the residual current of the same circuit and the circuit of working state of circuit breaker monitored simultaneously as claimed in claim 1 is characterized in that:
In described residual current signal acquisition circuit:
The residual current metering circuit is comprised of residual current transformer and the first resistance, and the first resistance is in parallel with the output terminal of residual current transformer, and described 2.048V voltage source is connected with described current transformer;
Differential amplifier circuit is comprised of the first operational amplifier and the second resistance, the 3rd resistance, the 4th resistance, the front end of the second resistance and the 3rd resistance is connected to the two ends of the first resistance, the rear end of the second resistance and the 3rd resistance connects respectively the first operational amplifier positive-negative input end, is connected the 4th resistance between the negative input end of the first operational amplifier and output terminal;
the bandpass filtering amplifying circuit is by the second operational amplifier and the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the first electric capacity, the second electric capacity forms, the front end of the 6th resistance connects the output of differential amplifier circuit, the rear end of the 6th resistance connects respectively the second electric capacity, the 7th resistance, the output terminal of rear termination second operational amplifier of the second electric capacity, the positive input terminal of rear termination second operational amplifier of the 7th resistance, the first electric capacity is connected between the positive input terminal and ground of the second operational amplifier, the 8th resistance is connected between the negative input end and ground of the second operational amplifier, the 9th resistance is connected between the negative input end and output terminal of the second operational amplifier.
3. the residual current of the same circuit and the circuit of working state of circuit breaker monitored simultaneously as claimed in claim 1 is characterized in that:
Described circuit breaker status monitoring circuit is comprised of optical coupler, and the input of optical coupler connects the monitoring loop auxiliary contacts of circuit breaker, and the output of optical coupler is transmitted the circuit breaker status signal to single-chip microcomputer.
4. the residual current of the same circuit and the circuit of working state of circuit breaker monitored simultaneously as claimed in claim 1 is characterized in that:
The voltage source of described 2.048V is comprised of the voltage follower circuit that reference source REF3020 and amplifier LM258 form, and forms the voltage source of the low output impedance of a 2.048V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220678934 CN202975123U (en) | 2012-12-10 | 2012-12-10 | Circuit for simultaneous monitoring residual current and breaker work state on same loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220678934 CN202975123U (en) | 2012-12-10 | 2012-12-10 | Circuit for simultaneous monitoring residual current and breaker work state on same loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202975123U true CN202975123U (en) | 2013-06-05 |
Family
ID=48516181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220678934 Expired - Lifetime CN202975123U (en) | 2012-12-10 | 2012-12-10 | Circuit for simultaneous monitoring residual current and breaker work state on same loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202975123U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474466A (en) * | 2019-01-23 | 2020-07-31 | 本德尔有限两合公司 | Circuit arrangement for detecting closed switch contacts and for protecting ground conductor against interruption in single-phase or polyphase supply lines |
| CN113064062A (en) * | 2021-03-26 | 2021-07-02 | 广东电网有限责任公司 | Circuit and device for monitoring secondary circuit of circuit breaker |
-
2012
- 2012-12-10 CN CN 201220678934 patent/CN202975123U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111474466A (en) * | 2019-01-23 | 2020-07-31 | 本德尔有限两合公司 | Circuit arrangement for detecting closed switch contacts and for protecting ground conductor against interruption in single-phase or polyphase supply lines |
| CN111474466B (en) * | 2019-01-23 | 2022-12-30 | 本德尔有限两合公司 | Circuit arrangement and method for detecting closed switch contacts and for protecting ground conductors against interruption |
| CN113064062A (en) * | 2021-03-26 | 2021-07-02 | 广东电网有限责任公司 | Circuit and device for monitoring secondary circuit of circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130605 |
|
| CX01 | Expiry of patent term |