CN101408597A - Method of electrified checkout of current mutual inductor - Google Patents
Method of electrified checkout of current mutual inductor Download PDFInfo
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- CN101408597A CN101408597A CNA2007100469870A CN200710046987A CN101408597A CN 101408597 A CN101408597 A CN 101408597A CN A2007100469870 A CNA2007100469870 A CN A2007100469870A CN 200710046987 A CN200710046987 A CN 200710046987A CN 101408597 A CN101408597 A CN 101408597A
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Abstract
The invention provides a current transformer electrification correcting method. In the method, a current signal is sampled at the primary side and the secondary side of a transformer in on-line operation, the sampled analog signal is converted into a digital signal, the digital signal is processed by an arithmetic unit by applying error formula of the transformer, finally the actual current value, ratio and angular difference of the current transformer are obtained, thus realizing the electrification correction of the transformer. The invention has the advantages that the electrification correction of the current transformer is realized; the devices such as a standard current transformer, an upwash device, a load box and the like are not required, thus the correcting device is simplified and is lightweight and portable, and the correcting method is simple; high insulating safe measuring is realized; capacity of resisting disturbance in the measuring process is improved; and the measuring precision is improved.
Description
Technical field
The present invention relates to the method for testing of electric parameter, be specifically related to a kind of current transformer electrification correcting method.
Background technology
Conventional current transformer verification mainly adopts relative method to carry out, when equipment power failure off-line, 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.Said method be confined to the to have a power failure test of off-line can't in time, truly reflect the state of operation mutual inductor under charged actual load situation, has lost the best opportunity of detecting mutual inductor incipient fault hidden danger.
Summary of the invention
The purpose of this invention is to provide the method for the field-checking that a kind of current transformer do not cut off the power supply, this method is easy and simple to handle, and the parameter that tests and calculates online mutual inductor that can be rapid, safe reflects the situation of online mutual inductor in service in time, truly.
Technical scheme of the present invention is as follows:
A kind of current transformer electrification correcting method, carry out with method according to the following steps:
A. the electric current clamp of a signal processor 2 is gathered the current signal of the primary side 1 of tested current transformer from the primary side 1 of tested current transformer, the signal conversion unit of a signal processor 2 becomes light signal with the analog signal conversion that collects, and is sent to advance signal processor 4 by optical fiber 3;
B. the current signal of 4 pairs of primary sides that receive 1 of advance signal processor carries out filtering, transforms the back through photoelectricity and transfers signals to arithmetical unit 6 by RS485 connection 5;
C. by subtractive polarity the current signal of the secondary side 9 of tested current transformer is collected arithmetical unit 6 by secondary current p- wire 7,8, the D/A conversion units in the arithmetical unit 6 are converted into digital quantity with the analog quantity that collects;
D. according to the error formula of mutual inductor, the internal arithmetic unit of arithmetical unit 6 carries out calculation process with the digital signal that step c and step b collect, and calculates ratio, the angular difference of mutual inductor, realizes the charged verification of mutual inductor.
The present invention is the primary side and the secondary side sample rate current signal of the mutual inductor from on-line operation directly, the analog signal conversion that collects is become digital signal, the error formula of utilization mutual inductor, by arithmetical unit digital signal is handled computing, finally draw the actual current value of current transformer and ratio, angular difference.Said method has the following advantages: the one, realized the charged verification of current transformer; The 2nd, do not need equipment such as standard current transformer, current lifting device and load box, calibration equipment simplification, light, the method for verification is simple; The 3rd, the primary current collection is finished by a signal processor, one time signal processor adopts high insulating material and ground protection with a vaulting pole, and the signal that once collects carried out opto-electronic conversion, arrive the advance signal processor by Optical Fiber Transmission, realize the security measurement of high insulation, assurance equipment and operating personnel's safety; The 4th, in current acquisition and signal processing, equipment adopts digitized processing and converter technique, has improved the antijamming capability in the measuring process, thereby has improved the precision of measuring.
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, electrified checkout of current mutual inductor need use 6, one preposition signal processors 4 of an arithmetical unit and a signal processor 2.
The electric current clamp of a signal processor 2 is clipped in tested mutual inductor primary side in the test process, and one time signal processor 2 output terminals are connected with advance signal processor 4 by optical fiber 3; The output terminal of advance signal processor 4 is received arithmetical unit 6 by RS485 connection 5; Secondary current p- wire 7,8 is connected tested Current Transformer Secondary side 9 by subtractive polarity with arithmetical unit 6; In checking procedure, the signal that signal processor 2 will collect carries out delivering to advance signal processor 4 by optical fiber 3 after the pre-service, and processor 4 carries out opto-electronic conversion with signal and becomes digital quantity signal to output to arithmetical unit 6; Meanwhile, secondary side current p- wire 7,8 is introduced directly into arithmetical unit 6 by subtractive polarity with the secondary current of tested current transformer, arithmetical unit carries out calculation process with the primary side digital signal after converting the secondary current analog signals to digital quantity signal, draw the ratio and the angular difference of current transformer, thereby realize the charged verification of current transformer.
In order to realize high insulation, signal processor and advance signal processor adopting optical fiber transmission technique; For fear of the influence of test site electromagnetic interference (EMI), signal processor and arithmetical unit internal arithmetic processing unit adopt converter technique that signal is handled.
Claims (1)
1. current transformer electrification correcting method, carry out with method according to the following steps:
A. the electric current clamp of a signal processor (2) is gathered the current signal of the primary side (1) of tested current transformer from the primary side (1) of tested current transformer, the signal conversion unit of a signal processor (2) becomes light signal with the analog signal conversion that collects, and is sent to advance signal processor (4) by optical fiber (3);
B. advance signal processor (4) carries out filtering to the current signal of the primary side (1) that receives, transforms the back through photoelectricity and transferring signals to arithmetical unit (6) by RS485 connection (5);
C. by subtractive polarity the current signal of the secondary side (9) of tested current transformer is collected arithmetical unit (6) by secondary current p-wire (7), (8), the D/A conversion unit in the arithmetical unit (6) is converted into digital quantity with the analog quantity that collects;
D. according to the error formula of mutual inductor, the internal arithmetic unit of arithmetical unit (6) carries out calculation process with the digital signal that step (c) and step (b) collect, and calculates ratio, the angular difference of mutual inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100469870A CN101408597A (en) | 2007-10-12 | 2007-10-12 | Method of electrified checkout of current mutual inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100469870A CN101408597A (en) | 2007-10-12 | 2007-10-12 | Method of electrified checkout of current mutual inductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101408597A true CN101408597A (en) | 2009-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100469870A Pending CN101408597A (en) | 2007-10-12 | 2007-10-12 | Method of electrified checkout of current mutual inductor |
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| CN (1) | CN101408597A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014063570A1 (en) * | 2012-10-24 | 2014-05-01 | 国家电网公司 | Method for on-line diagnosing gradually-changing fault of electronic current transformers |
| CN104133154A (en) * | 2013-05-03 | 2014-11-05 | 武汉凯默电气有限公司 | Intelligent substation current transformer polarity test method and device |
| CN105068033A (en) * | 2015-07-15 | 2015-11-18 | 国家电网公司 | Verification device for photoelectric current transformer and method thereof |
| CN105974349A (en) * | 2016-05-04 | 2016-09-28 | 中国科学院上海应用物理研究所 | Current transformer tracking accuracy measurement method |
| WO2017016370A1 (en) * | 2015-07-28 | 2017-02-02 | 中国电力科学研究院 | Method of designing ultra-high voltage ct coil having self-calibration function |
| CN108181599A (en) * | 2017-12-01 | 2018-06-19 | 国网江西省电力有限公司检修分公司 | A kind of transformer station direct current system punching current transformer, which does not have a power failure, replaces check method |
| CN112816754A (en) * | 2020-12-22 | 2021-05-18 | 深圳供电局有限公司 | Current compensation method and equipment for current transformer |
| CN113552525A (en) * | 2021-07-23 | 2021-10-26 | 南方科技大学 | Error estimation method, device and equipment of voltage transformer and storage medium |
| CN115561695A (en) * | 2022-11-18 | 2023-01-03 | 山西互感器电测设备有限公司 | On-site calibration device and method for three-phase current transformer |
-
2007
- 2007-10-12 CN CNA2007100469870A patent/CN101408597A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014063570A1 (en) * | 2012-10-24 | 2014-05-01 | 国家电网公司 | Method for on-line diagnosing gradually-changing fault of electronic current transformers |
| CN104133154A (en) * | 2013-05-03 | 2014-11-05 | 武汉凯默电气有限公司 | Intelligent substation current transformer polarity test method and device |
| CN104133154B (en) * | 2013-05-03 | 2016-12-28 | 武汉凯默电气有限公司 | A kind of intelligent substation current transformer polarity testing method and device |
| CN105068033A (en) * | 2015-07-15 | 2015-11-18 | 国家电网公司 | Verification device for photoelectric current transformer and method thereof |
| WO2017016370A1 (en) * | 2015-07-28 | 2017-02-02 | 中国电力科学研究院 | Method of designing ultra-high voltage ct coil having self-calibration function |
| CN105974349A (en) * | 2016-05-04 | 2016-09-28 | 中国科学院上海应用物理研究所 | Current transformer tracking accuracy measurement method |
| CN105974349B (en) * | 2016-05-04 | 2018-06-08 | 中国科学院上海应用物理研究所 | A kind of measuring method of current transformer tracking accuracy |
| CN108181599A (en) * | 2017-12-01 | 2018-06-19 | 国网江西省电力有限公司检修分公司 | A kind of transformer station direct current system punching current transformer, which does not have a power failure, replaces check method |
| CN112816754A (en) * | 2020-12-22 | 2021-05-18 | 深圳供电局有限公司 | Current compensation method and equipment for current transformer |
| CN113552525A (en) * | 2021-07-23 | 2021-10-26 | 南方科技大学 | Error estimation method, device and equipment of voltage transformer and storage medium |
| CN113552525B (en) * | 2021-07-23 | 2024-04-02 | 南方科技大学 | Error estimation method, device and equipment of voltage transformer and storage medium |
| CN115561695A (en) * | 2022-11-18 | 2023-01-03 | 山西互感器电测设备有限公司 | On-site calibration device and method for three-phase current transformer |
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Open date: 20090415 |