CN204177957U - A kind of electric energy meter Insulation Test isolated form leak current detection device - Google Patents
A kind of electric energy meter Insulation Test isolated form leak current detection device Download PDFInfo
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- CN204177957U CN204177957U CN201420573715.1U CN201420573715U CN204177957U CN 204177957 U CN204177957 U CN 204177957U CN 201420573715 U CN201420573715 U CN 201420573715U CN 204177957 U CN204177957 U CN 204177957U
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- 238000012360 testing method Methods 0.000 title claims abstract description 48
- 238000009413 insulation Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a kind of electric energy meter Insulation Test isolated form leak current detection device, it is characterized in that: described block system relay comprises relay tip and relay coil, the electric current and voltage end of tested electric energy meter is connected with a contact of relay tip, another contact of electrical equipment contact exports high-end being connected with the voltage of voltage resistant instrument, the shell of tested electric energy meter exports low side with the voltage of buffer circuit mutual inductor and voltage resistant instrument successively and is connected, the voltage signal of buffer circuit mutual inductor collection passes through rectifier successively, sampling amplifier enters in comparer, leakage current arranges device and is connected with comparer, comparator signal output terminal is connected with light emitting diode positive pole, light emitting diode negative pole is connected with relay coil, the action of relay coil pilot relay contact.It is better that the utility model provides a kind of versatility, and testing efficiency is high, manufactures use cost lower, use more safe and reliable electric energy meter Insulation Test isolated form leak current detection device.
Description
Technical field
The utility model relates to a kind of isolated form leakage current detection circuit for carrying out Insulation test to single three-phase electric energy meter, belongs to detection of electrical leakage technical field.
Background technology
According to code electric energy meter before being installed to electrical network and technical indicator test, all need to carry out alternating voltage dielectric test, whether electric energy meter is intact, even if the index that can sustain national standard is withstand voltage qualified, to ensure the safety in electric energy meter use.
During dielectric voltage withstand test, voltage resistant instrument exports the alternating voltage up to 4000V, and bring safely huge hidden danger to tester and instrument weak current part, very easily occur that accident occurs, the personnel that cause injure and economic loss.Do not have independent pick-up unit directly to detect electric energy meter at present, testing efficiency is lower, and waste a large amount of man power and materials, testing cost is higher simultaneously.
Utility model content
In order to solve voltage resistant instrument output HIGH voltage when dielectric voltage withstand of the prior art is tested, larger potential safety hazard is brought to tester and instrument weak current part, and method of testing testing efficiency is low at present, the problem that testing cost is higher, it is simple that the utility model provides a kind of structure, and versatility is better, and testing efficiency is high, manufacture use cost lower, use more safe and reliable electric energy meter Insulation Test isolated form leak current detection device.
In order to solve the problem, technical solution adopted in the utility model is:
A kind of electric energy meter Insulation Test isolated form leak current detection device, comprise isolation current transformer, rectifier, sampling amplifier, comparer, leakage current arranges device, light emitting diode and block system relay, described block system relay comprises relay tip and relay coil, the electric current and voltage connecting terminals of tested electric energy meter is connected together and is connected with a contact of relay tip, another contact of described relay tip exports high-end being connected with the voltage of voltage resistant instrument, the shell of described tested electric energy meter exports low side with the voltage of buffer circuit mutual inductor and voltage resistant instrument successively by divider resistance and is connected, the voltage signal of described buffer circuit mutual inductor collection passes through rectifier successively, sampling amplifier enters in comparer, leakage current arranges also to send into after the leakage current value set is converted to voltage signal by device in comparer and compares with the voltage signal gathered, described comparator signal output terminal is connected with light emitting diode positive pole, described light emitting diode negative pole is connected with relay coil, the action of described relay coil pilot relay contact.
Aforesaid a kind of electric energy meter Insulation Test isolated form leak current detection device, it is characterized in that: the shell of described tested electric energy meter is connected by divider resistance one end with the armature winding of buffer circuit mutual inductor, the other end of the armature winding of described buffer circuit mutual inductor exports low side with the voltage of voltage resistant instrument and is connected.
Aforesaid a kind of electric energy meter Insulation Test isolated form leak current detection device, it is characterized in that: the secondary winding of described buffer circuit mutual inductor is connected with rectifier, the alternating current that described rectifier arrives for receiving buffer circuit mutual inductor sample, alternating current rectification will become corresponding direct voltage output.
Aforesaid a kind of electric energy meter Insulation Test isolated form leak current detection device, is characterized in that: described sampling amplifier receives the d. c. voltage signal of rectifier conveying, and d. c. voltage signal is carried out amplification output.
Aforesaid a kind of electric energy meter Insulation Test isolated form leak current detection device, is characterized in that: described comparer is for judging that the d. c. voltage signal that sampling amplifier is carried and leakage current arrange the size of the voltage signal that leakage current value converts to by device.
Aforesaid a kind of electric energy meter Insulation Test isolated form leak current detection device, it is characterized in that: described leakage current arranges device and adopts digital to analog converter, described digital to analog converter input end is connected with single-chip microcomputer, and the output terminal of described digital to analog converter is connected with comparer.
The beneficial effect that the utility model reaches: the utility model electric energy meter Insulation Test isolated form leak current detection device adopts isolation current transformer that primary current larger for voltage resistant instrument side numerical value is converted to the less secondary current of numerical value by certain no-load voltage ratio, and such test safety reliability improves greatly.The utility model proving installation structure is simple simultaneously, method of testing is quick, can be used as independent test module and carry out dismounting, can be applied on multi-epitope electric energy meter insulation test device, each epi-position uses a test module, and all epi-positions can be tested simultaneously, be independent of each other, effectively can improve testing efficiency, save a large amount of man power and materials, reduced production cost.
Accompanying drawing explanation
Fig. 1 is the utility model electric energy meter Insulation Test isolated form leak current detection device circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, a kind of electric energy meter Insulation Test isolated form leak current detection device, comprise isolation current transformer 3, rectifier 4, sampling amplifier 5, comparer 6, leakage current arranges device 7, light emitting diode 8 and block system relay, described block system relay comprises relay tip 10 and relay coil 9, the electric current and voltage terminal 11 of tested electric energy meter 1 links together and to be connected with a contact of relay tip 10, another contact of described relay tip 10 exports high-end being connected with the voltage of voltage resistant instrument 2, the shell 12 of described tested electric energy meter 1 exports low side with the voltage of buffer circuit mutual inductor 3 and voltage resistant instrument successively by divider resistance and is connected, the shell 12 of described tested electric energy meter 1 is connected by divider resistance one end with the armature winding of buffer circuit mutual inductor 3, the other end of the armature winding of described buffer circuit mutual inductor 3 exports low side 14 with the voltage of voltage resistant instrument 2 and is connected, form voltage-withstand test loop.
The secondary winding of described buffer circuit mutual inductor 3 is connected with rectifier 4, voltage output signal after the rectification of described rectifier 4 enters in comparer 6 by sampling amplifier 5, leakage current arranges also to send into after the leakage current value set is converted to voltage signal by device 7 in comparer 6 and compares with the voltage signal gathered, described comparer 6 signal output part is connected with light emitting diode 8 positive pole, described light emitting diode 8 negative pole is connected with relay coil 9, the action of described relay coil 9 pilot relay contact 10.
Isolation current transformer 3 for sample withstand voltage test time loop in current value; The alternating current that rectifier 4 samples for receiving buffer circuit mutual inductor 3, and the AC current values rectification sampled is become direct voltage output; Sampling amplifier 5 receives the d. c. voltage signal that rectifier 4 is carried, and d. c. voltage signal is carried out amplification exports to comparer 6.Leakage current arranges device 7 and adopts digital to analog converter to realize, by single-chip microcomputer, output valve can be set by bus and set leakage current value, digital signal sent to leakage current that device 7 is set, arrange device 7 via leakage current to convert simulating signal to and flow to comparer 6, comparer 6 is for judging that the d. c. voltage signal that sampling amplifier 5 is carried and leakage current arrange the size of the voltage signal that device 7 converts to.Light emitting diode 8 is used to indicate the leakage current value whether voltage resistant instrument 2 leakage current value exceedes setting, and relay coil 9 is for controlling the High voltage output of voltage resistant instrument 2.
During AC voltage withstand test, relay tip 10 short circuit, voltage resistant instrument 2 exports the high voltage of 4kV, is applied on tested electric energy meter 1.Isolate the leakage current value in current transformer 3 real-time sampling test loop simultaneously; The alternating current of sampling becomes corresponding direct voltage output by rectifier 4, is amplified send in comparer 6 by sampling amplifier 5, arranges the leakage current value that device 7 sets compare judgement with leakage current; When being greater than settings, comparer 6 outputs signal, and lights light emitting diode 8 and carries out alarm, drives relay coil 9 simultaneously, disconnects relay tip 10, and cut off the High voltage output of voltage resistant instrument 2, exit test, test specimen is defective.Be less than the leakage current value comparer no-output of setting, test specimen is qualified.
In sum, the utility model electric energy meter Insulation Test isolated form leak current detection device adopts isolation current transformer that primary current larger for voltage resistant instrument side numerical value is converted to the less secondary current of numerical value by certain no-load voltage ratio, and such test safety reliability improves greatly.The utility model proving installation structure is simple simultaneously, method of testing is quick, can be used as independent test module and carry out dismounting, can be applied on multi-epitope electric energy meter insulation test device, each epi-position uses a test module, and all epi-positions can be tested simultaneously, be independent of each other, effectively can improve testing efficiency, save a large amount of man power and materials, reduced production cost.
More than show and describe ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (6)
1. an electric energy meter Insulation Test isolated form leak current detection device, comprise isolation current transformer, rectifier, sampling amplifier, comparer, leakage current arranges device, light emitting diode and block system relay, it is characterized in that: described block system relay comprises relay tip and relay coil, the electric current and voltage connecting terminals of tested electric energy meter is connected together and is connected with a contact of relay tip, another contact of described relay tip exports high-end being connected with the voltage of voltage resistant instrument, the shell of described tested electric energy meter exports low side with the voltage of buffer circuit mutual inductor and voltage resistant instrument successively by divider resistance and is connected, the voltage signal of described buffer circuit mutual inductor collection passes through rectifier successively, sampling amplifier enters in comparer, leakage current arranges also to send into after the leakage current value set is converted to voltage signal by device in comparer and compares with the voltage signal gathered, described comparator signal output terminal is connected with light emitting diode positive pole, described light emitting diode negative pole is connected with relay coil, the action of described relay coil pilot relay contact.
2. a kind of electric energy meter Insulation Test isolated form leak current detection device according to claim 1, it is characterized in that: the shell of described tested electric energy meter is connected by divider resistance one end with the armature winding of buffer circuit mutual inductor, the other end of the armature winding of described buffer circuit mutual inductor exports low side with the voltage of voltage resistant instrument and is connected.
3. a kind of electric energy meter Insulation Test isolated form leak current detection device according to claim 2, it is characterized in that: the secondary winding of described buffer circuit mutual inductor is connected with rectifier, the alternating current that described rectifier arrives for receiving buffer circuit mutual inductor sample, alternating current rectification will become corresponding direct voltage output.
4. a kind of electric energy meter Insulation Test isolated form leak current detection device according to claim 3, is characterized in that: described sampling amplifier receives the d. c. voltage signal of rectifier conveying, and d. c. voltage signal is carried out amplification output.
5. a kind of electric energy meter Insulation Test isolated form leak current detection device according to claim 4, is characterized in that: described comparer is for judging that the d. c. voltage signal that sampling amplifier is carried and leakage current arrange the size of the voltage signal that leakage current value converts to by device.
6. a kind of electric energy meter Insulation Test isolated form leak current detection device according to claim 5, it is characterized in that: described leakage current arranges device and adopts digital to analog converter, described digital to analog converter input end is connected with single-chip microcomputer, and the output terminal of described digital to analog converter is connected with comparer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420573715.1U CN204177957U (en) | 2014-09-30 | 2014-09-30 | A kind of electric energy meter Insulation Test isolated form leak current detection device |
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| CN201420573715.1U CN204177957U (en) | 2014-09-30 | 2014-09-30 | A kind of electric energy meter Insulation Test isolated form leak current detection device |
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| CN204177957U true CN204177957U (en) | 2015-02-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237841A (en) * | 2014-09-30 | 2014-12-24 | 国家电网公司 | Isolation type current leakage detecting device for electric energy meter insulation tests |
| CN108279375A (en) * | 2017-12-26 | 2018-07-13 | 浙江奔龙自动化科技有限公司 | The detection device of breaker voltage endurance |
| CN111489542A (en) * | 2020-03-24 | 2020-08-04 | 宁波水表(集团)股份有限公司 | Receiving circuit of M-Bus instrument Bus |
-
2014
- 2014-09-30 CN CN201420573715.1U patent/CN204177957U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237841A (en) * | 2014-09-30 | 2014-12-24 | 国家电网公司 | Isolation type current leakage detecting device for electric energy meter insulation tests |
| CN108279375A (en) * | 2017-12-26 | 2018-07-13 | 浙江奔龙自动化科技有限公司 | The detection device of breaker voltage endurance |
| CN111489542A (en) * | 2020-03-24 | 2020-08-04 | 宁波水表(集团)股份有限公司 | Receiving circuit of M-Bus instrument Bus |
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