CN204028215U - A kind of HV live displaying circuit - Google Patents
A kind of HV live displaying circuit Download PDFInfo
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- CN204028215U CN204028215U CN201420458341.9U CN201420458341U CN204028215U CN 204028215 U CN204028215 U CN 204028215U CN 201420458341 U CN201420458341 U CN 201420458341U CN 204028215 U CN204028215 U CN 204028215U
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- 238000001914 filtration Methods 0.000 claims abstract description 7
- 230000001419 dependent effect Effects 0.000 claims description 3
- 238000012795 verification Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a kind of HV live displaying circuit.The technical matters solved be to provide a kind of have high reliability, the long-life, non-maintaining, show clear eye-catching HV live displaying circuit.For solving the problem, the technical solution adopted in the utility model comprises three-phase high voltage and after bridge diode current rectifying and wave filtering circuit, export direct current after sensor sample, then passes through by resistance R
2, resistance R
7the bleeder circuit of composition, when the voltage assigned to when two ends is greater than 0.15 times of busbar voltage, then phase pilot lamp is bright, and when voltage is greater than 0.65 times of busbar voltage, circuit, after photoelectrical coupler PC817, makes triode Q
1conducting, input, the output voltage of voltage follower LM358 are 0V, then after over-voltage comparator output low level, triode Q
2cut-off, locking electromagnetic relay is failure to actuate, and unlocks pilot lamp and does not work, when voltage is all less than 0.65 times of busbar voltage. photoelectrical coupler PC817 can not be made to export, obtain the input of voltage follower LM358, output voltage is l2v, export high level through over-voltage comparator, triode Q
2conducting, unlocks pilot lamp bright.
Description
Technical field
The utility model relates to a kind of HV live displaying circuit.
Background technology
High voltage switch cabinet electricity check problem is a problem perplexing electric power safety for many years and produce.Machinery " five prevent " blocking device of Totally-enclosed-type " five prevent " switch cubicle of current popularization.The requirement of safety regulations " first electrical verification, rear hanging earthing conductor " cannot be met.Because when performing power failure work.Equipment no-voltage must be identified before conjunction grounding switch.But closed high-voltage switch cabinet is in full closeding state, electrical verification cannot be carried out with Portable high pressure electroscope to equipment according to normal method of operating.Therefore, just occur unlocking the mode electrical verification of opening door of switch cabinet by force, in view of the problems that old-fashioned high voltage display device exists, objectively need a kind of completely newly have high reliability, the long-life, non-maintaining, show clear eye-catching, the novel charged display device that can make up old-fashioned high voltage display device defect, with the person, the equipment breakdown that effectively prevent mistakenly entering charged chamber or charged conjunction grounding switch etc. from causing.
Utility model content
The technical problems to be solved in the utility model be to provide a kind of have high reliability, the long-life, non-maintaining, show clear eye-catching HV live displaying circuit.
For solving the problem, the technical solution adopted in the utility model comprises three-phase high voltage and after bridge diode current rectifying and wave filtering circuit, export direct current after sensor sample, then passes through by resistance R
2, resistance R
7the bleeder circuit of composition, when the voltage assigned to when two ends is greater than 0.15 times of busbar voltage, then phase pilot lamp is bright, and when voltage is greater than 0.65 times of busbar voltage, circuit, after photoelectrical coupler PC817, makes triode Q
1conducting, the input of voltage follower LM358, output voltage are 0 V, then after over-voltage comparator output low level, triode Q
2cut-off, locking electromagnetic relay is failure to actuate, and unlocks pilot lamp and does not work, when voltage is all less than 0.65 times of busbar voltage. photoelectrical coupler PC817 can not be made to export, obtain the input of voltage follower LM358, output voltage is l2 v, export high level through over-voltage comparator, triode Q
2conducting, unlocks pilot lamp bright.
Described HV live displaying circuit, is characterized in that: connect voltage dependent resistor (VDR) RV1 before described bridge diode current rectifying and wave filtering circuit.
HV live displaying circuit of the present utility model, this circuit adopts single-phase monitoring to add lock-in control technology, can ensure that blocking voltage is constant, stable operation when misoperations such as system phase shortages.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, HV live displaying circuit of the present utility model, the high-tension measurement of three-phase is after sensor sample obtains.After bridge diode current rectifying and wave filtering circuit 1, export direct current again, then pass through by resistance R
2, resistance R
7the bleeder circuit of composition, when the voltage assigned to when two ends is greater than 0.15 times of busbar voltage, then phase pilot lamp 2 is bright, and show that this is mutually charged, wherein voltage dependent resistor (VDR) RV1 plays overvoltage protection.Testing circuit exports through dividing potential drop, filtering, if the phase voltage detected is greater than 0.65 times of busbar voltage, circuit, after photoelectrical coupler PC817, makes triode Q
1conducting, the input of voltage follower LM358, output voltage are 0 V, then after over-voltage comparator 3 output low level, triode Q
2cut-off, locking electromagnetic relay 4 is failure to actuate, and unlocks pilot lamp 5 and does not work, and forces electrically reliable locking, at this moment can not open cabinet door.If instead phase voltage is all less than 0.65 times of busbar voltage, photoelectrical coupler PC817 can not be made to export, obtain the input of voltage follower LM358, output voltage is l2 v, exports high level through over-voltage comparator 3, triode Q
2conducting, unlocks pilot lamp 5 bright, can make the action of locking electromagnetic relay, can open cabinet door.Wherein decoupling capacitance C
4, resistance R
12, and resistance R
14the circuit of composition provides suitable reference value for voltage comparator.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., be all included within protection domain of the present utility model.
Claims (2)
1. a HV live displaying circuit, it is characterized in that: three-phase high voltage exports direct current after sensor sample after bridge diode current rectifying and wave filtering circuit (1), bleeder circuit again through being made up of resistance R2, resistance R7, when the voltage assigned to when two ends is greater than 0.15 times of busbar voltage, then phase pilot lamp (2) is bright, when voltage is greater than 0.65 times of busbar voltage, circuit, after photoelectrical coupler PC817, makes triode Q
1conducting, the input of voltage follower LM358, output voltage are 0 V, then after over-voltage comparator (3) output low level, triode Q
2cut-off, locking electromagnetic relay (4) is failure to actuate, unlock pilot lamp (5) not work, when voltage is all less than 0.65 times of busbar voltage, photoelectrical coupler PC817 can not be made to export, obtain the input of voltage follower LM358, output voltage is l2 v, export high level through over-voltage comparator (3), triode Q
2conducting, unlocks pilot lamp (5) bright.
2. HV live displaying circuit according to claim 1, is characterized in that: described bridge diode current rectifying and wave filtering circuit (1) connects voltage dependent resistor (VDR) RV1 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420458341.9U CN204028215U (en) | 2014-08-14 | 2014-08-14 | A kind of HV live displaying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420458341.9U CN204028215U (en) | 2014-08-14 | 2014-08-14 | A kind of HV live displaying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204028215U true CN204028215U (en) | 2014-12-17 |
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ID=52068057
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420458341.9U Expired - Fee Related CN204028215U (en) | 2014-08-14 | 2014-08-14 | A kind of HV live displaying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204028215U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968320A (en) * | 2017-12-28 | 2018-04-27 | 哈尔滨瑞兴变压器制造有限公司 | The control method of switchgear control system |
-
2014
- 2014-08-14 CN CN201420458341.9U patent/CN204028215U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107968320A (en) * | 2017-12-28 | 2018-04-27 | 哈尔滨瑞兴变压器制造有限公司 | The control method of switchgear control system |
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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: 20141217 Termination date: 20160814 |
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| CF01 | Termination of patent right due to non-payment of annual fee |