CN101162263A - Current mutual inductor on site verify method - Google Patents
Current mutual inductor on site verify method Download PDFInfo
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- CN101162263A CN101162263A CNA2006101171351A CN200610117135A CN101162263A CN 101162263 A CN101162263 A CN 101162263A CN A2006101171351 A CNA2006101171351 A CN A2006101171351A CN 200610117135 A CN200610117135 A CN 200610117135A CN 101162263 A CN101162263 A CN 101162263A
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- current transformer
- secondary winding
- current
- tested
- mutual inductor
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Abstract
The invention provides a field checking method for a current transformer, wherein, the primary winding of a verified current transformer is separated from the primary system; and the secondary winding of the verified current transformer is applied a testing voltage, the current in the secondary winding of the verified current transformer is measured; according to the measured valve, the computing program in a checking instrument calculates the electrical parameter of the error property of the verified current transformer, and then a mathematic model for describing the electrical property of the verified current transformer is built; furthermore, the measuring errors of the verified current transformer working with different loads and in different currents. By the current transformer provided in the invention, the checking instrument is simple, and is of good safety and high checking efficiency.
Description
Technical field
The present invention relates to the method for testing of electric parameter, be specifically related to a kind of method of current mutual inductor on site verification.
Background technology
Conventional current mutual inductor on site verification mainly adopts relative method to carry out, and calibration equipment mainly is made up of standard current transformer, up-flow source (device), load box.During field-checking, utilize up-flow source (device) to provide test current to standard current transformer and winding of tested current transformer simultaneously, Secondary Winding with standard current transformer is output as true value then, calculates or measure the output error of tested secondary winding in current transformer.The calibration equipment of said method is bulky, heavy, the field wiring complexity, and the working time is long, efficient is low, is difficult to satisfy that current transformer is in enormous quantities, the needs of efficient in-situ verification.
Summary of the invention
Purpose of design of the present invention provides a kind of method of current mutual inductor on site verification, uses this method to carry out the current mutual inductor on site verification, need not to use huge, heavy calibration equipment, and can improve the efficient of field-checking.
Technical scheme of the present invention:
A kind of method of current mutual inductor on site verification, carry out with method according to the following steps:
A. the winding 7 with tested current transformer 5 disconnects with primary system, apply trial voltage from the Secondary Winding terminal 6 of tested current transformer 5, and the electric current of current transformer 5 Secondary Winding is flow through in measurement, in the checking procedure, the size of the internal circuit of current mutual inductor on site tester 1 control trial voltage, and measure winding 7 and the voltage of Secondary Winding terminal 6 and the electric current that flows through Secondary Winding in real time;
B. according to the measured value that obtains, the calculation procedure of tester 1 inside calculates the electric parameter of describing tested current transformer error characteristic: Secondary Winding resistance 8, excitatory electricity lead 10 and magnetizing susceptance 11, and Secondary Winding leakage reactance 9 can be ignored;
C. the analytical calculation program of tester 1 inside is set up the mathematical model of describing tested current transformer 5 electrical specifications, and is further calculated the measuring error of tested current transformer 5 under different load and current condition according to the result of calculation of step b.
The present invention adopts and applies trial voltage from tested secondary winding in current transformer, while experiment with measuring electric current, at first be to have omitted electromagnetic type electrical equipments such as the needed standard current transformer of existing method, current lifting device and load box, so calibration equipment can significantly be simplified; The 2nd, the conversion of load and test current condition is realized by internal processes fully, does not need the field modification wiring and regulates calibration equipment, efficient height; The 3rd, test power is little, and not needing provides test power to secondary load; The 4th, in the checking procedure, only needing provides lower trial voltage and electric current to tested current transformer, and security is good.
Description of drawings
Fig. 1 is a principle schematic of the present invention.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the method of current mutual inductor on site verification is: use a current mutual inductor on site tester 1 that provides 3 pairs of terminal systems, apply trial voltage by terminal 2 to the Secondary Winding terminal 6 of tested current transformer 5, terminal 3 connects the Secondary Winding terminal 6 of tested current transformer 5, and terminal 4 connects winding 7 of tested current transformer; In the process of the test, the size of the internal circuit of current mutual inductor on site tester 1 control trial voltage, and measure winding 7 and the voltage of Secondary Winding terminal 6 and the electric current that flows through Secondary Winding in real time.According to these measured values, the calculation procedure of tester inside calculates the electric parameter of describing tested current transformer error characteristic, comprising: Secondary Winding resistance 8, excitatory electricity lead 10 and magnetizing susceptance 11, and Secondary Winding leakage reactance 9 can be ignored.On this basis, the calculation procedure of tester inside can calculate the measuring error of tested current transformer 5 under different load and current condition.
For fear of the influence of test site electromagnetic interference (EMI), the frequency conversion measuring technology can be adopted in tester 1 inside.
Claims (1)
1. the method for a current mutual inductor on site verification, carry out with method according to the following steps:
A. the winding (7) with tested current transformer (5) disconnects with primary system, apply trial voltage from the Secondary Winding terminal (6) of tested current transformer (5), and the electric current of current transformer (5) Secondary Winding is flow through in measurement, in the checking procedure, the size of the internal circuit control trial voltage of current mutual inductor on site tester (1), and measure the voltage of a winding (7) and Secondary Winding terminal (6) and the electric current that flows through Secondary Winding in real time;
B. according to the measured value that obtains, the inner calculation procedure of tester (1) calculates the electric parameter of describing tested current transformer error characteristic: Secondary Winding resistance (8), excitatory electricity are led (10) and magnetizing susceptance (11), and Secondary Winding leakage reactance (9) can be ignored;
C. the analytical calculation program of tester (1) inside is according to the result of calculation of step (b), set up the mathematical model of describing tested current transformer (5) electrical specification, and further calculate the measuring error of tested current transformer (5) under different load and current condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101171351A CN101162263A (en) | 2006-10-13 | 2006-10-13 | Current mutual inductor on site verify method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101171351A CN101162263A (en) | 2006-10-13 | 2006-10-13 | Current mutual inductor on site verify method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101162263A true CN101162263A (en) | 2008-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101171351A Pending CN101162263A (en) | 2006-10-13 | 2006-10-13 | Current mutual inductor on site verify method |
Country Status (1)
| Country | Link |
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| CN (1) | CN101162263A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290345B (en) * | 2008-06-06 | 2010-10-13 | 北京浩霆光电技术有限责任公司 | Multifunctional mutual-inductor tester |
| CN102253355A (en) * | 2011-05-31 | 2011-11-23 | 上海思南电力通信有限公司 | System and method for inspecting small-signal output type unconventional mutual inductor |
| CN102331567A (en) * | 2011-05-31 | 2012-01-25 | 上海思南电力通信有限公司 | Inspection system and inspection method for optical signal outputting type non-conventional instrument transformer (NCIT) |
| CN102087347B (en) * | 2009-12-08 | 2013-05-29 | 张建 | Charged test method for current transformer and application thereof |
| CN103698730A (en) * | 2013-12-12 | 2014-04-02 | 国网上海市电力公司 | Current transformer checking system of alternating current-direct current double power supplies |
| CN115980654A (en) * | 2023-02-03 | 2023-04-18 | 广州市德珑电子器件有限公司 | Current transformer detection method and system |
-
2006
- 2006-10-13 CN CNA2006101171351A patent/CN101162263A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101290345B (en) * | 2008-06-06 | 2010-10-13 | 北京浩霆光电技术有限责任公司 | Multifunctional mutual-inductor tester |
| CN102087347B (en) * | 2009-12-08 | 2013-05-29 | 张建 | Charged test method for current transformer and application thereof |
| CN102253355A (en) * | 2011-05-31 | 2011-11-23 | 上海思南电力通信有限公司 | System and method for inspecting small-signal output type unconventional mutual inductor |
| CN102331567A (en) * | 2011-05-31 | 2012-01-25 | 上海思南电力通信有限公司 | Inspection system and inspection method for optical signal outputting type non-conventional instrument transformer (NCIT) |
| CN102331567B (en) * | 2011-05-31 | 2014-03-26 | 上海电力通信有限公司 | Inspection system and inspection method for optical signal outputting type non-conventional instrument transformer (NCIT) |
| CN102253355B (en) * | 2011-05-31 | 2014-03-26 | 上海电力通信有限公司 | System and method for inspecting small-signal output type unconventional mutual inductor |
| CN103698730A (en) * | 2013-12-12 | 2014-04-02 | 国网上海市电力公司 | Current transformer checking system of alternating current-direct current double power supplies |
| CN115980654A (en) * | 2023-02-03 | 2023-04-18 | 广州市德珑电子器件有限公司 | Current transformer detection method and system |
| CN115980654B (en) * | 2023-02-03 | 2023-10-31 | 广州市德珑电子器件有限公司 | Current transformer detection method and system |
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