CN202770916U - Current transformer no-load voltage ratio tester - Google Patents
Current transformer no-load voltage ratio tester Download PDFInfo
- Publication number
- CN202770916U CN202770916U CN201220470555.9U CN201220470555U CN202770916U CN 202770916 U CN202770916 U CN 202770916U CN 201220470555 U CN201220470555 U CN 201220470555U CN 202770916 U CN202770916 U CN 202770916U
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- current transformer
- current
- digital
- alternating
- electrically connected
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Abstract
The utility model discloses a current transformer no-load voltage ratio tester and settles a problem of field detection difficulty of current transformer no-load voltage ratio employing a current comparison method in the prior art. The current transformer no-load voltage ratio tester comprises a 200 millivolt alternating current digital voltmeter (V1) which is connected in parallel between both ends of a primary side coil of a current transformer, wherein a voltage adjustment end of an alternating current voltage regulator is electrically connected with a test end of a 20 milliampere alternating current digital ammeter (A), the other test end of the 20 milliampere alternating current digital ammeter (A) is electrically connected with one end (K1) of a secondary side coil of the current transformer, the other end (K2) of the secondary side coil of the current transformer is electrically connected with a grounding end of the alternating current voltage regulator, and a 400V alternating current digital voltmeter (V2) is connected in parallel between the voltage adjustment end and the grounding end of the alternating current voltage regulator. The current transformer no-load voltage ratio tester is convenient to operate, has high measurement precision and is especially applicable to a field no-load voltage ratio test of the current transformer.
Description
Technical field
This novel practical relates to a kind of device that can detect current transformer ratio.
Background technology
Current transformer is to utilize electromagnetic induction principle that large current conversion is become little electric current, for measurement mechanism, protective device and control device provide suitable voltage or current signal.Safe, reliable, the economical operation of its precision and reliability and electric system are closely related.Therefore the on-site proving of mutual inductor is to guarantee power system security, the reliable and efficient important step of moving.Along with the development of power supply capacity, the primary side current of current transformer is also increasing, adopts the electric current Comparison Method that in advance test and the on-site proving of current transformer ratio have been become more and more difficult.Its main cause has: the specified large electric current of the primary side of current transformer is difficult to reach, and the standard current transformer volume that secondly needs is also very large and cost is high.Test if reduce tested current transformer primary current, then its ratio error can be very large, tests just meaningless.
Summary of the invention
The utility model provides a kind of ratio tester for current transformer, has solved existing employing electric current Comparison Method the in advance test of current transformer ratio and on-site proving have been become more and more difficult technical matters.
The utility model is by the above problem of following solution:
A kind of ratio tester for current transformer, comprise current transformer, the alternating voltage pressure regulator, 20 milliamperes of alternating-current digital ampere meters, 400 volts of AC digital voltmeters and 200 millivolts of AC digital voltmeters, one end of the first siding ring of current transformer is electrically connected with a test lead of 200 millivolts of AC digital voltmeters, another test lead of 200 millivolts of AC digital voltmeters is electrically connected with the other end of the first siding ring of current transformer, the voltage adjusting end of alternating voltage pressure regulator is electrically connected with a test lead of 20 milliamperes of alternating-current digital ampere meters, another test lead of 20 milliamperes of alternating-current digital ampere meters is electrically connected with an end of the second siding ring of current transformer, the other end of the second siding ring of current transformer is electrically connected with the earth terminal of alternating voltage pressure regulator, is parallel with 400 volts of AC digital voltmeters between the voltage adjusting end of alternating voltage pressure regulator and earth terminal.
Described alternating voltage pressure regulator, 20 milliamperes of alternating-current digital ampere meters, 400 volts of AC digital voltmeters and 200 millivolts of AC digital voltmeters all are arranged in the tester shell.
The utility model is easy to operate, and cost is low, and measuring accuracy is high, and weight is lighter, and particularly suitable carries out the no-load voltage ratio test to current transformer at the scene.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
A kind of ratio tester for current transformer, comprise current transformer, the alternating voltage pressure regulator, 20 milliamperes of alternating-current digital ampere meter A, 400 volts of AC digital voltmeter V2 and 200 millivolts of AC digital voltmeter V1, one end L1 of the first siding ring of current transformer is electrically connected with the test lead of 200 millivolts of AC digital voltmeter V1, another test lead of 200 millivolts of AC digital voltmeter V1 is electrically connected with the other end L2 of the first siding ring of current transformer, the voltage adjusting end of alternating voltage pressure regulator is electrically connected with the test lead of 20 milliamperes of alternating-current digital ampere meter A, another test lead of 20 milliamperes of alternating-current digital ampere meter A is electrically connected with an end K1 of the second siding ring of current transformer, the other end K2 of the second siding ring of current transformer is electrically connected with the earth terminal of alternating voltage pressure regulator, is parallel with 400 volts of AC digital voltmeter V2 between the voltage adjusting end of alternating voltage pressure regulator and earth terminal.
Described alternating voltage pressure regulator, 20 milliamperes of alternating-current digital ampere meter A, 400 volts of AC digital voltmeter V2 and 200 millivolts of AC digital voltmeter V1 all are arranged in the tester shell.
The alternating voltage pressure regulator is used for adjusting input current transformer second siding ring voltage, the AC400V AC digital voltmeter is measured Current Transformer Secondary lateral coil voltage in the process of the test, the 200mV AC digital voltmeter is measured current transformer first siding ring voltage in the process of the test, and the AC20mA alternating-current digital ampere meter is measured the exciting current of Current Transformer Secondary lateral coil in process of the test in the process of the test.For the precision problem in the warranty test process, the exciting current of the Current Transformer Secondary side in the process of the test need to be limited in below the 5mA, record current transformer one secondary side voltage at this moment can draw the no-load voltage ratio value of current transformer.
Claims (2)
1. ratio tester for current transformer, comprise current transformer, the alternating voltage pressure regulator, 20 milliamperes of alternating-current digital ampere meters (A), 400 volts of AC digital voltmeters (V2) and 200 millivolts of AC digital voltmeters (V1), it is characterized in that, one end (L1) of the first siding ring of current transformer is electrically connected with a test lead of 200 millivolts of AC digital voltmeters (V1), another test lead of 200 millivolts of AC digital voltmeters (V1) is electrically connected with the other end (L2) of the first siding ring of current transformer, the voltage adjusting end of alternating voltage pressure regulator is electrically connected with a test lead of 20 milliamperes of alternating-current digital ampere meters (A), another test lead of 20 milliamperes of alternating-current digital ampere meters (A) is electrically connected with an end (K1) of the second siding ring of current transformer, the other end of the second siding ring of current transformer (K2) is electrically connected with the earth terminal of alternating voltage pressure regulator, is parallel with 400 volts of AC digital voltmeters (V2) between the voltage adjusting end of alternating voltage pressure regulator and earth terminal.
2. a kind of ratio tester for current transformer according to claim 1, it is characterized in that, described alternating voltage pressure regulator, 20 milliamperes of alternating-current digital ampere meters (A), 400 volts of AC digital voltmeters (V2) and 200 millivolts of AC digital voltmeters (V1) all are arranged in the tester shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220470555.9U CN202770916U (en) | 2012-09-12 | 2012-09-12 | Current transformer no-load voltage ratio tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220470555.9U CN202770916U (en) | 2012-09-12 | 2012-09-12 | Current transformer no-load voltage ratio tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202770916U true CN202770916U (en) | 2013-03-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220470555.9U Expired - Lifetime CN202770916U (en) | 2012-09-12 | 2012-09-12 | Current transformer no-load voltage ratio tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202770916U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064340A (en) * | 2014-07-03 | 2014-09-24 | 国家电网公司 | Secondary current amplification coil of current transformer |
| CN106093609A (en) * | 2016-08-04 | 2016-11-09 | 深圳供电局有限公司 | A kind of little output capacity Current Mutual Inductance no-load voltage ratio method of testing and device |
-
2012
- 2012-09-12 CN CN201220470555.9U patent/CN202770916U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104064340A (en) * | 2014-07-03 | 2014-09-24 | 国家电网公司 | Secondary current amplification coil of current transformer |
| CN106093609A (en) * | 2016-08-04 | 2016-11-09 | 深圳供电局有限公司 | A kind of little output capacity Current Mutual Inductance no-load voltage ratio method of testing and device |
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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: 20130306 |