CN203490357U - Self-detection-type residual current transformer detection circuit - Google Patents
Self-detection-type residual current transformer detection circuit Download PDFInfo
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- CN203490357U CN203490357U CN201320534118.3U CN201320534118U CN203490357U CN 203490357 U CN203490357 U CN 203490357U CN 201320534118 U CN201320534118 U CN 201320534118U CN 203490357 U CN203490357 U CN 203490357U
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- current transformer
- residual current
- resistance
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Abstract
The utility model provides a self-detection-type residual current transformer detection circuit. The circuit comprises an integration module, an integrated operation amplifier, a residual current transformer, a processor, a first resistor and a first capacitor. A signal output terminal of the processor is connected with a non-inverting input terminal of the integrated operation amplifier through the integration module. An output terminal of the integrated operation amplifier is grounded through a first winding of the residual current transformer, the first resistor and the first capacitor in sequence. An inverting input terminal of the integrated operation amplifier is connected between the first winding of the residual current transformer and the first resistor. A second winding of the residual current transformer is connected with a signal input terminal of the processor. The self-detection-type residual current transformer detection circuit provided by the utility model is capable of automatically detecting whether the detection of the residual current transformer is accurate, saving time and manpower, and the detection result is accurate and not influenced by human factors.
Description
Technical field
The utility model relates to a kind of residual current transformer testing circuit of self-monitoring.
Background technology
When the residual current transformer of existing residual-current electrical fire detector will overhaul, need first residual current transformer to be disassembled, then by special checkout equipment, detect the work in every performance of residual current transformer, to judge whether residual current transformer has job failure, this kind of maintenance mode time and effort consuming, and testing result is easily subject to the impact of human factor, affect the accuracy of testing result.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is intended to provide a kind of residual current transformer testing circuit of self-monitoring, its convenient detection residual current transformer, and testing result is accurate.
For achieving the above object, the utility model adopts following technical scheme:
A residual current transformer testing circuit for self-monitoring, it comprises integration module, integrated transporting discharging, residual current transformer, processor, the first resistance and the first electric capacity;
The signal output part of this processor connects the in-phase input end of this integrated transporting discharging by this integration module, the output terminal of this integrated transporting discharging is successively by a winding, the first resistance and first capacity earth of residual current transformer, the inverting input of this integrated transporting discharging connects between winding and this first resistance of this residual current transformer, and the Secondary Winding of this residual current transformer connects the signal input part of this processor;
This processor is for sending a SPWM signal by its signal output part, this SPWM signal is inputted the inverting input of this integrated transporting discharging by integration module Integral Processing, this integrated transporting discharging is for exporting sinusoidal constant current signal to a winding of this residual current transformer, the Secondary Winding induction of this residual current transformer generates and detects induced signal, this processor is compared this detection induced signal and default standard induced signal scope, when this detection induced signal is outside this standard induced signal scope, this processor sends failure alarm signal.
Further, this integration module comprises the second resistance, the 3rd resistance and the second electric capacity; The signal output part of this processor is connected the in-phase input end of this integrated transporting discharging successively with the 3rd resistance by this second resistance, the inverting input of this integrated transporting discharging also connects the node between this second resistance and the 3rd resistance by the second electric capacity.
Further, residual current transformer testing circuit also comprises filter capacitor, and the in-phase input end of this integrated transporting discharging is also by this filter capacitor ground connection.
The beneficial effects of the utility model are as follows:
Whether above-mentioned utility model can detect residual current transformer detection automatically accurate, time saving and energy saving, and testing result is accurate, is not affected by human factors.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of better embodiment of the residual current transformer testing circuit of the utility model self-monitoring.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further:
Refer to Fig. 1, the utility model relates to a kind of residual current transformer testing circuit of self-monitoring, and its better embodiment comprises that resistance R 1 is to resistance R 3, capacitor C 1 to capacitor C 3, integrated transporting discharging U1, residual current transformer L and processor 10.
The in-phase input end of this integrated transporting discharging U1 is connected the signal output part of processor 10 by resistance R 2 successively with resistance R 1, also by capacitor C 1 ground connection.The node that the end of oppisite phase of this integrated transporting discharging U1 connects between this resistance R 1 and resistance R 2 by capacitor C 2.The output terminal of this integrated transporting discharging U1 is successively by a winding, resistance R 3 and capacitor C 3 ground connection of residual current transformer L.The inverting input of this integrated transporting discharging U1 also connects the node between this residual current transformer L and this resistance R 3.The Secondary Winding of this residual current transformer L connects the signal input part of this processor 10.
This resistance R 1, resistance R 2 and capacitor C 2 form an integration module, and this capacitor C 1 is for filtering.
This processor U1 is for sending the SPWM(Sinusoidal Pulse Width Modulation of a 400Hz frequency by its signal output part, Using Sinusoidal Pulse Width Modulation) signal, this SPWM signal is after above-mentioned integration module Integral Processing, and by capacitor C 1, carry out inputting after filtering the in-phase input end of this integrated transporting discharging U1, this integrated transporting discharging U1 exports a sinusoidal constant current signal to a winding of this residual current transformer L according to received signal, the Secondary Winding induction of this residual current transformer L generates and detects induced signal, and will detect induced signal and input to the signal input part of this processor U1, this processor U1 compares this detection induced signal and default standard induced signal scope, if this detects induced signal within this standard induced signal scope, this residual current transformer L is working properly, this processor U1 does not carry out fault alarm, if this detects induced signal outside this standard induced signal scope, this processor U1 sends failure alarm signal, to remind this residual current transformer of staff L that test is inaccurate.
Whether above-mentioned utility model can detect residual current transformer detection automatically accurate, time saving and energy saving, and testing result is accurate, is not affected by human factors.
For a person skilled in the art, can make other various corresponding changes and distortion according to technical scheme described above and design, and these all changes and distortion all should belong to the protection domain of the utility model claim within.
Claims (3)
1. a residual current transformer testing circuit for self-monitoring, is characterized in that: it comprises integration module, integrated transporting discharging, residual current transformer, processor, the first resistance and the first electric capacity;
The signal output part of this processor connects the in-phase input end of this integrated transporting discharging by this integration module, the output terminal of this integrated transporting discharging is successively by a winding, the first resistance and first capacity earth of residual current transformer, the inverting input of this integrated transporting discharging connects between winding and this first resistance of this residual current transformer, and the Secondary Winding of this residual current transformer connects the signal input part of this processor;
This processor is for sending SPWM signal by its signal output part, this SPWM signal is inputted the inverting input of this integrated transporting discharging by integration module Integral Processing, this integrated transporting discharging is for exporting sinusoidal constant current signal to a winding of this residual current transformer, the Secondary Winding induction of this residual current transformer generates and detects induced signal, this processor is compared this detection induced signal and default standard induced signal scope, when this detection induced signal is outside this standard induced signal scope, this processor sends failure alarm signal.
2. the residual current transformer testing circuit of self-monitoring as claimed in claim 1, is characterized in that: this integration module comprises the second resistance, the 3rd resistance and the second electric capacity; The signal output part of this processor is connected the in-phase input end of this integrated transporting discharging successively with the 3rd resistance by this second resistance, the inverting input of this integrated transporting discharging also connects the node between this second resistance and the 3rd resistance by the second electric capacity.
3. the residual current transformer testing circuit of self-monitoring as claimed in claim 1 or 2, is characterized in that: residual current transformer testing circuit also comprises filter capacitor, and the in-phase input end of this integrated transporting discharging is also by this filter capacitor ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320534118.3U CN203490357U (en) | 2013-08-29 | 2013-08-29 | Self-detection-type residual current transformer detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320534118.3U CN203490357U (en) | 2013-08-29 | 2013-08-29 | Self-detection-type residual current transformer detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203490357U true CN203490357U (en) | 2014-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320534118.3U Expired - Fee Related CN203490357U (en) | 2013-08-29 | 2013-08-29 | Self-detection-type residual current transformer detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203490357U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678342A (en) * | 2015-03-27 | 2015-06-03 | 凯里供电局 | Intelligent self-checking method for residual current detection circuit based on signal injection mode |
| CN104764919A (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Electronic type voltage transformer based on lossy double integrating circuit |
-
2013
- 2013-08-29 CN CN201320534118.3U patent/CN203490357U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764919A (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Electronic type voltage transformer based on lossy double integrating circuit |
| CN104764919B (en) * | 2015-03-16 | 2017-12-22 | 中国计量学院 | Based on the electronic type voltage transformer for damaging double integrating circuit |
| CN104678342A (en) * | 2015-03-27 | 2015-06-03 | 凯里供电局 | Intelligent self-checking method for residual current detection circuit based on signal injection mode |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140319 Termination date: 20180829 |
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| CF01 | Termination of patent right due to non-payment of annual fee |