CN201576068U - Test circuit for inspecting polarities of transformer - Google Patents
Test circuit for inspecting polarities of transformer Download PDFInfo
- Publication number
- CN201576068U CN201576068U CN2009202453091U CN200920245309U CN201576068U CN 201576068 U CN201576068 U CN 201576068U CN 2009202453091 U CN2009202453091 U CN 2009202453091U CN 200920245309 U CN200920245309 U CN 200920245309U CN 201576068 U CN201576068 U CN 201576068U
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- light emitting
- emitting diode
- current transformer
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Abstract
The utility model discloses a test circuit for inspecting polarities of a transformer, comprising a primary side circuit and a secondary side circuit, wherein the primary side circuit is formed by connecting a direct-current power supply with two ends of a current transformer to be tested. One end of the current transformer to be tested connected with the anode of the power supply is an A end, and one end of the current transformer to be tested connected with the cathode of the power supply is a B end. The utility model is characterized in that the secondary side circuit is formed by connecting two mutual-reverse parallel light emitting diodes with the two ends of the current transformer to be tested, wherein the anode of the first light emitting diode and the cathode of the second light emitting diode are connected with the A end, and the cathode of the first light emitting diode and the anode of the second light emitting diode are connected with the B end.
Description
Technical field
The utility model relates to a kind of test circuit, particularly a kind of test loop of checking mutual inductor polarity.
Background technology
Checked current transformer (CT) polarity chron moment induced current method, be to add 1.5 volts of direct currents at primary side with dry cell moment in the past, and secondary side is placed current gear induction secondary current direction with pointer multimeter and judged whether mutual inductor polarity is correct.Because technology innovation and environmental protection requirement, dry cell is eliminated by market gradually, and does mutual inductor product export polarity test with pointer multimeter, and loss is big, and practical use is single, and the wasting of resources is bigger, and economic serviceability is poor.
Summary of the invention
The purpose of this utility model provides a kind of test loop of convenient, fast, economic check mutual inductor polarity.
For reaching above purpose, the utility model takes following technical scheme to be achieved:
A kind of test circuit of checking mutual inductor polarity, comprise primary side loop and secondary side loop, the primary side loop is connected current transformer to be measured two ends by a direct current power supply and constitutes, current transformer to be measured one end that wherein positive source connected is the A end, and an end of the current transformer to be measured that power cathode connected is the B end; It is characterized in that, described secondary side loop by two each other the light emitting diode of reverse parallel connection be connected current transformer to be measured two ends and constitute, wherein the negative pole of anodal and second light emitting diode of first light emitting diode connects the A end; The positive pole of the negative pole of first light emitting diode and second light emitting diode connects the B end.
The test circuit of another kind of check mutual inductor polarity, comprise primary side loop and secondary side loop, the primary side loop is connected current transformer to be measured two ends by a direct current power supply and constitutes, current transformer to be measured one end that wherein positive source connected is the A end, and an end of the current transformer to be measured that power cathode connected is the B end; It is characterized in that, described secondary side loop by two each other the light emitting diode of reverse parallel connection be connected current transformer to be measured two ends and constitute, wherein the negative pole of anodal and second light emitting diode of first light emitting diode connects the A end; The positive pole of the negative pole of first light emitting diode and second light emitting diode connects the B end; Further, first light emitting diode positive pole is anodal in parallel with one the 3rd light emitting diode, and the first light emitting diode negative pole is in parallel with an end of one first resistance, and the negative pole of the 3rd light emitting diode is connected with the other end of described first resistance; The second light emitting diode negative pole is in parallel with the negative pole of one the 4th light emitting diode, and second light emitting diode is anodal in parallel with an end of one second resistance, and the positive pole of the 3rd light emitting diode is connected with the other end of described first resistance.
In the such scheme, described first light emitting diode is the green LED pipe; Second light emitting diode is the red LED pipe.Described the 3rd, the 4th light emitting diode is homochromy respectively at first, second light emitting diode.Described direct supply is the lithium battery of 9-18V.The resistance of described first, second resistance is between 20-50 Ω.
The utility model utilizes the unidirectional on state characteristic of light emitting diode and the combination of other electronic components to be equipped with common lithium battery, finishing mutual inductor polarity detects, has advantage easy to use, simple to operate, during in the past with the experiment of pointer multimeter, both need to see the test pencil wiring position, also will see the indicator swaying direction.Multimeter is placed the improper judgement that can influence test findings.Use the utility model checking circuit,, just can judge by the color of LED lamp whether polarity is correct intuitively, improved the work efficiency of test as long as secondary connection is correct.
Description of drawings
Fig. 1 is the first embodiment circuit theory diagrams of the present utility model.
Fig. 2 is the second embodiment circuit theory diagrams of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
Embodiment one
As shown in Figure 1, a kind of test circuit of checking mutual inductor polarity, comprise primary side loop and secondary side loop, the primary side loop is connected current transformer CT to be measured two ends by a direct supply E and constitutes, current transformer to be measured one end that wherein positive source connected is the A end, and an end of the current transformer to be measured that power cathode connected is the B end; The secondary side loop by two each other light emitting diode D1, the D2 of reverse parallel connection be connected current transformer to be measured two ends and constitute, wherein the negative pole of the positive pole of light emitting diode D1 and light emitting diode D2 connects the A end; The positive pole of the negative pole of light emitting diode D1 and light emitting diode D2 connects the B end.Light emitting diode D1 is the green LED pipe; Light emitting diode D2 is the red LED pipe.
The direct supply E lithium battery of 18V.It is the CT product of 20-50 Ω that the present embodiment circuit can be used for checking internal resistance.Light emitting diode D1 was bright when CT polarity was correct, and it is bright that polarity meets inverse time light emitting diode D2.
Embodiment two
As shown in Figure 2, the test circuit of another kind of check mutual inductor polarity, the primary side loop is identical with embodiment one, but the secondary side loop is distinguished to some extent: light emitting diode D1 positive pole is anodal in parallel with a light emitting diode D3's, light emitting diode D1 negative pole is in parallel with an end of resistance R 1, and the negative pole of light emitting diode D3 is connected with the other end of resistance R 1; Light emitting diode D2 negative pole is in parallel with the negative pole of a light emitting diode D4, and light emitting diode D2 is anodal in parallel with an end of a resistance R 2, and the positive pole of light emitting diode D4 is connected with the other end of described resistance R 2.Light emitting diode D1, D3 are the green LED pipe; Light emitting diode D2, D4 are the red LED pipe.The 9V power supply is selected in the primary circuit.
Because LED is electronic component, Imax (maximum allows to pass through electric current) generally all very little (20mA), and the measurement coil secondary induction current of the little CT of internal resistance is big, generally is several times of Imax.When the secondary induction current of CT during greater than Imax, easily LED is burnt out, influence serviceable life.Therefore the present embodiment circuit guarantees that in the resistance R 1 (R2) of a 20-50 Ω of D3, D4 series connection in use LED can not burnt out respectively after the moment energising.Like this LED forward is connected in parallel, when CT polarity was subtractive polarity, the bright expression wiring of LED green light was correct, the bright expression wiring error of LED red light when CT loop polarity wrong.
Claims (7)
1. test circuit of checking mutual inductor polarity, comprise primary side loop and secondary side loop, the primary side loop is connected current transformer to be measured two ends by a direct current power supply and constitutes, current transformer to be measured one end that wherein positive source connected is the A end, and an end of the current transformer to be measured that power cathode connected is the B end; It is characterized in that, described secondary side loop by two each other the light emitting diode of reverse parallel connection be connected current transformer to be measured two ends and constitute, wherein the negative pole of anodal and second light emitting diode of first light emitting diode connects the A end; The positive pole of the negative pole of first light emitting diode and second light emitting diode connects the B end.
2. the test circuit of check mutual inductor polarity as claimed in claim 1 is characterized in that, described first light emitting diode is the green LED pipe; Second light emitting diode is the red LED pipe.
3. the test circuit of check mutual inductor polarity as claimed in claim 1 is characterized in that, described direct supply is the lithium battery of 9-18V.
4. test circuit of checking mutual inductor polarity, comprise primary side loop and secondary side loop, the primary side loop is connected current transformer to be measured two ends by a direct current power supply and constitutes, current transformer to be measured one end that wherein positive source connected is the A end, and an end of the current transformer to be measured that power cathode connected is the B end; It is characterized in that, described secondary side loop by two each other the light emitting diode of reverse parallel connection be connected current transformer to be measured two ends and constitute, wherein the negative pole of anodal and second light emitting diode of first light emitting diode connects the A end; The positive pole of the negative pole of first light emitting diode and second light emitting diode connects the B end; Further, first light emitting diode positive pole is anodal in parallel with one the 3rd light emitting diode, and the first light emitting diode negative pole is in parallel with an end of one first resistance, and the negative pole of the 3rd light emitting diode is connected with the other end of described first resistance; The second light emitting diode negative pole is in parallel with the negative pole of one the 4th light emitting diode, and second light emitting diode is anodal in parallel with an end of one second resistance, and the positive pole of the 3rd light emitting diode is connected with the other end of described first resistance.
5. the test circuit of check mutual inductor polarity as claimed in claim 4 is characterized in that, described the first, the 3rd light emitting diode is the green LED pipe; Described the second, the 4th light emitting diode is the red LED pipe.
6. the test circuit of check mutual inductor polarity as claimed in claim 4 is characterized in that, described direct supply is the lithium battery of 9-18V.
7. the test circuit of check mutual inductor polarity as claimed in claim 4 is characterized in that, the resistance of described first, second resistance is 20-50 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202453091U CN201576068U (en) | 2009-11-18 | 2009-11-18 | Test circuit for inspecting polarities of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202453091U CN201576068U (en) | 2009-11-18 | 2009-11-18 | Test circuit for inspecting polarities of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201576068U true CN201576068U (en) | 2010-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202453091U Expired - Lifetime CN201576068U (en) | 2009-11-18 | 2009-11-18 | Test circuit for inspecting polarities of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201576068U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364689A (en) * | 2012-03-30 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Transformer wiring diagram dotted terminal detecting device |
| CN103389439A (en) * | 2013-07-29 | 2013-11-13 | 国家电网公司 | CT (computed tomography) polarity detecting instrument |
| CN103472357A (en) * | 2013-08-23 | 2013-12-25 | 国家电网公司 | Polarity detecting device of current transformer |
| CN104749480A (en) * | 2015-03-08 | 2015-07-01 | 国家电网公司 | Whole-set secondary circuit polarity testing device used for relay protection |
| CN104865494A (en) * | 2015-05-06 | 2015-08-26 | 国家电网公司 | Portable current transformer polarity testing device and use method thereof |
| CN109298280A (en) * | 2018-10-29 | 2019-02-01 | 国网新疆电力有限公司昌吉供电公司 | Current transformer device for detecting polarity with self-test circuit |
-
2009
- 2009-11-18 CN CN2009202453091U patent/CN201576068U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364689A (en) * | 2012-03-30 | 2013-10-23 | 海洋王（东莞）照明科技有限公司 | Transformer wiring diagram dotted terminal detecting device |
| CN103389439A (en) * | 2013-07-29 | 2013-11-13 | 国家电网公司 | CT (computed tomography) polarity detecting instrument |
| CN103472357A (en) * | 2013-08-23 | 2013-12-25 | 国家电网公司 | Polarity detecting device of current transformer |
| CN103472357B (en) * | 2013-08-23 | 2016-03-23 | 国家电网公司 | A kind of current transformer device for detecting polarity |
| CN104749480A (en) * | 2015-03-08 | 2015-07-01 | 国家电网公司 | Whole-set secondary circuit polarity testing device used for relay protection |
| CN104749480B (en) * | 2015-03-08 | 2017-06-30 | 国网山东省电力公司枣庄供电公司 | One kind is used for relay protection secondary circuit whole group polarity test device |
| CN104865494A (en) * | 2015-05-06 | 2015-08-26 | 国家电网公司 | Portable current transformer polarity testing device and use method thereof |
| CN109298280A (en) * | 2018-10-29 | 2019-02-01 | 国网新疆电力有限公司昌吉供电公司 | Current transformer device for detecting polarity with self-test circuit |
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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: 20100908 |