CN202735461U - Polarity tester for current transformer - Google Patents
Polarity tester for current transformer Download PDFInfo
- Publication number
- CN202735461U CN202735461U CN 201220201328 CN201220201328U CN202735461U CN 202735461 U CN202735461 U CN 202735461U CN 201220201328 CN201220201328 CN 201220201328 CN 201220201328 U CN201220201328 U CN 201220201328U CN 202735461 U CN202735461 U CN 202735461U
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- current transformer
- positive
- polarity
- negative
- diode
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- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 12
- 239000003086 colorant Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
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Abstract
The utility model discloses a polarity tester for a current transformer, and relates to the technical field of polarity test of the current transformer. The tester comprises a shell; and a detection circuit in the shell, wherein the detection circuit is composed of a signal access circuit connected with a secondary side of the current transformer and used for outputting the positive and negative peak voltage, a signal process circuit connected with the signal access circuit and used for respectively conversing the positive and negative peak voltage into +5V voltage, and a signal indication circuit connected with the signal process circuit and used for indicating the polarity of the current transformer. The polarity tester has advantages of time saving, labor saving, economy, practicability, and great convenience brought to the polarity test of the current transformer.
Description
Technical field
The utility model relates to the current transformer polarity testing technical field, specifically a kind of current transformer polarity
Tester.
Background technology
Current transformer polarity testing is newly to go up the pilot project that must carry out after current transformer or current transformer are reinstalled, and input has the protection (such as directional over-current protection, differential protection etc.) of strict demand and measures most important to the Current Transformer Secondary electric current to those for it.If current transformer polar orientation mistake will directly cause protecting malfunction or tripping, continuous data mistake.
Along with the appearance of various testers, the automaticity of relay protection check work is also improving.Yet also in the traditional method of continuity, there are the shortcomings such as the robotization journey is low, consuming time, effort in the work major parts such as current transformer polarity testing, no-load voltage ratio test.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the utility model provides a kind of instrument for testing polarity of current transformer, can conveniently detect the polarity of current transformer.
The utility model is realized with following technical scheme: a kind of instrument for testing polarity of current transformer, comprise housing, testing circuit is installed in the housing, described testing circuit comprises being connected with the Current Transformer Secondary side and is used for exporting the signal place in circuit of positive and negative crest voltage, is connected respectively with the signal place in circuit and positive and negative crest voltage is converted to+signal processing circuit of 5V voltage, is connected the signal indicating circuit that is used to indicate current transformer polarity with signal processing circuit.
The beneficial effects of the utility model are: save time, saving of labor, economic, practical, bring great convenience to current transformer polarity testing; Effectively avoid occuring because current transformer polar orientation mistake causes protecting malfunction or misaction, improve power supply reliability, guarantee power grid security; Just can finish at the scene, improve widely the power supply availability, have national promotional value.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the utility model theory diagram;
Fig. 2 is signal place in circuit figure;
Fig. 3 is signal processing circuit figure;
Fig. 4 is signal indicating circuit figure;
Fig. 5 is the shell structure schematic diagram.
Embodiment
As shown in Figure 1, instrument for testing polarity of current transformer has a testing circuit, described testing circuit comprises being connected with the Current Transformer Secondary side and is used for exporting the signal place in circuit of positive and negative crest voltage, is connected respectively with the signal place in circuit and positive and negative crest voltage is converted to+signal processing circuit of 5V voltage, is connected the signal indicating circuit that is used to indicate current transformer polarity with signal processing circuit.
As shown in Figure 2, the signal place in circuit comprises diode D1, D2 and electrochemical capacitor C1, C2, the negative electrode of diode D1 connects the anode of diode D1, its anode connects the negative pole of electrochemical capacitor C1, the negative electrode of diode D2 connects the positive pole of electrochemical capacitor C2, the minus earth of the positive pole of electrochemical capacitor C1 and electrochemical capacitor C2; The negative electrode of diode D1 is drawn as the positive signal input end, the positive pole of electrochemical capacitor C1 is drawn as the negative signal input end; The anode of diode D1 is drawn as the positive peak voltage output end, the negative electrode of diode D2 is exported as the negative peak voltage output end.
As shown in Figure 3, signal processing circuit comprises comparer LM1, LM2 and triode T1, T2, the base stage of the output termination triode T1 of comparer LM1, and the emitter of triode T1 is as positive polarity output detections end; The base stage of the output termination triode T2 of comparer LM2, the emitter of triode T2 is as negative polarity output detections end.
As shown in Figure 4, signal indicating circuit comprises pilot lamp LED1, the LED2 of different colours, and pilot lamp LED1 connects positive polarity output detections end, and pilot lamp LED2 connects negative polarity output detections end.Described pilot lamp LED1 is green indicating lamp, and pilot lamp LED2 is red led.Each different hummer in parallel at the two ends of pilot lamp LED1, LED2, two sound differences that hummer sends.
If the positive signal input end is connected with the positive pole of current transformer, then pilot lamp LED1 is bright, if the positive signal input end is connected with the negative pole of current transformer, then pilot lamp LED2 is bright.
As shown in Figure 5, the check point hardship among Fig. 1 is arranged in the illustrated housing, wherein pilot lamp LED1, LED2, power light LED and power switch S are arranged on the surface of housing.One side of housing is provided with 1,2,3 and N4 terminals.Wherein 1 end is connected with the positive signal input end, and the N end is connected with the negative signal input end.
The course of work: on " 1 " and " N " of Current Transformer Secondary outlet by positive polarity access instrument for testing polarity of current transformer, press " power switch " button, droop test at the current transformer primary side with the 9V dry cell, the positive-negative polarity that on instrument for testing polarity of current transformer, can show intuitively current transformer, if 1 termination is anodal, then pilot lamp LED1 is bright, if the N termination is anodal, then pilot lamp LED2 is bright.This tester can correctly record no-load voltage ratio less than or equal to the polarity of 4000/5 current transformer, satisfy the needs of all CT polarity tests of transformer station, can reduce on the spot current transformer polarity test number and repeat to droop number of times, and reach the purposes such as the tester volume is little, portable, easy to operate, indication is directly perceived, greatly simplify work on the spot.
The step of carrying out the polarity test operation on the current transformer is as follows:
1, Job readiness: the work responsible official holds on-the-spot kick-off meeting, checks preparation, and by the instrument that the work responsible official lists, the bill of materials checks one by one.
2, with on " 1 " and " N " of Current Transformer Secondary side outlet by positive polarity access instrument for testing polarity of current transformer, press " power switch " button.
3, droop test at the current transformer primary side with the 9V dry cell, by people monitoring, people work, the pilot lamp of observing instrument for testing polarity of current transformer shows to judge that current transformer polarity is positive and negative.
4, withdraw the scene: the meeting of knocking off of the work responsible official scene of holding, personnel, Work tool are withdrawn the scene.
Claims (3)
1. instrument for testing polarity of current transformer, comprise housing, testing circuit is installed in the housing, described testing circuit comprises being connected with the Current Transformer Secondary side and is used for exporting the signal place in circuit of positive and negative crest voltage, is connected respectively with the signal place in circuit and positive and negative crest voltage is converted to+signal processing circuit of 5V voltage, is connected the signal indicating circuit that is used to indicate current transformer polarity with signal processing circuit.
2. instrument for testing polarity of current transformer according to claim 1, it is characterized in that: described signal place in circuit comprises diode D1, D2 and electrochemical capacitor C1, C2, the negative electrode of diode D2 connects the anode of diode D1, its anode connects the negative pole of electrochemical capacitor C1, the negative electrode of diode D2 connects the positive pole of electrochemical capacitor C2, the minus earth of the positive pole of electrochemical capacitor C1 and electrochemical capacitor C2; The negative electrode of diode D1 is drawn as the positive signal input end, the positive pole of electrochemical capacitor C1 is drawn as the negative signal input end; The anode of diode D1 is drawn as the positive peak voltage output end, the negative electrode of diode D2 is exported as the negative peak voltage output end;
Signal processing circuit comprises comparer LM1, LM2 and triode T1, T2, the base stage of the output termination triode T1 of comparer LM1, and the emitter of triode T1 is as positive polarity output detections end; The base stage of the output termination triode T2 of comparer LM2, the emitter of triode T2 is as negative polarity output detections end;
Signal indicating circuit comprises pilot lamp LED1, the LED2 of different colours, and pilot lamp LED1 connects positive polarity output detections end, and pilot lamp LED2 connects negative polarity output detections end;
If the positive signal input end is connected with the positive pole of current transformer, then pilot lamp LED1 is bright, if the positive signal input end is connected with the negative pole of current transformer, then pilot lamp LED2 is bright.
3. instrument for testing polarity of current transformer according to claim 2, it is characterized in that: described pilot lamp LED1 is green indicating lamp, pilot lamp LED2 is red led.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220201328 CN202735461U (en) | 2012-05-08 | 2012-05-08 | Polarity tester for current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220201328 CN202735461U (en) | 2012-05-08 | 2012-05-08 | Polarity tester for current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202735461U true CN202735461U (en) | 2013-02-13 |
Family
ID=47661146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220201328 Expired - Lifetime CN202735461U (en) | 2012-05-08 | 2012-05-08 | Polarity tester for current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202735461U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459451A (en) * | 2014-11-26 | 2015-03-25 | 国网河南省电力公司鹤壁供电公司 | Transformer current mutual inductor polarity tester and testing method |
| CN107478943A (en) * | 2017-08-09 | 2017-12-15 | 大唐东北电力试验研究所有限公司 | Detect the method and device of differential protection for generator polarity |
| CN111103557A (en) * | 2019-12-31 | 2020-05-05 | 中国南方电网有限责任公司 | Transformer homodyne protection CT polarity verification method and system |
-
2012
- 2012-05-08 CN CN 201220201328 patent/CN202735461U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104459451A (en) * | 2014-11-26 | 2015-03-25 | 国网河南省电力公司鹤壁供电公司 | Transformer current mutual inductor polarity tester and testing method |
| CN104459451B (en) * | 2014-11-26 | 2017-05-10 | 国网河南省电力公司鹤壁供电公司 | Transformer current mutual inductor polarity tester and testing method |
| CN107478943A (en) * | 2017-08-09 | 2017-12-15 | 大唐东北电力试验研究所有限公司 | Detect the method and device of differential protection for generator polarity |
| CN111103557A (en) * | 2019-12-31 | 2020-05-05 | 中国南方电网有限责任公司 | Transformer homodyne protection CT polarity verification method and system |
| CN111103557B (en) * | 2019-12-31 | 2021-11-09 | 中国南方电网有限责任公司 | Transformer homodyne protection CT polarity verification method and system |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130213 |