CN102401889A - Online checking method for high-tension current transformer - Google Patents
Online checking method for high-tension current transformer Download PDFInfo
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- CN102401889A CN102401889A CN2011103508375A CN201110350837A CN102401889A CN 102401889 A CN102401889 A CN 102401889A CN 2011103508375 A CN2011103508375 A CN 2011103508375A CN 201110350837 A CN201110350837 A CN 201110350837A CN 102401889 A CN102401889 A CN 102401889A
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Abstract
The invention relates to an online checking method for a high-tension current transformer, which can check the high-tension current transformer in the field operation with high accuracy. The online checking method is characterized in that in a return circuit of the high-tension current transformer to be checked, a high-accuracy pincerlike hollow coil based on a PCB (Printed Circuit board) is connected in series, so that the high-tension current transformer is used as a standard current transformer, the signal of the high-tension side is digitized and transmitted to the low-tension side through fiber transmission, the output value of the standard current transformer and the output value of the checked high-tension current transformer at the synchronized instant are compared through an external synchronous trigger signal, the digital integration algorithm and error theory algorithm are realized by using a virtual instrument in a checking platform, so that the accuracy of the checked high-tension current transformer in the field operation is checked, the cost of interruption is reduced, and the checking period of the high-tension current transformer is shortened.
Description
Technical field
The present invention relates to a kind of high-tension current inductor on-line testing method; Be specially and utilize the pincerlike air core coil of pin-point accuracy to be the normalized current sensor; Under power-off condition not, the high-tension current inductor of scene operation is carried out verification, belong to electrotechnical measurement and detection technique field.
Background technology
The accuracy of current transformer is the important assurance of electric system metering, protection, monitoring.In order to guarantee the accuracy of electric energy metrical, the legitimate rights and interests that Reasonable Protection power department, generating department and user are tripartite, therefore the monitoring to current transformer error is very necessary.Current transformer is an infrastructure device of measuring electric system current/voltage physical quantity, is the first step of detection of electric system presence and fault diagnosis, also is an of paramount importance step, the duty of its accuracy and stable directly influence protection and metering outfit.
In view of the method for verification, the current transformer calibrator of using at present only is applied to the off-line testing or the prophylactic repair of producing check and scene of mutual inductor product mostly.Routine test and overhaul all need to have a power failure, and can cause economic loss and waste of human resource.The regular preventive trial condition of off-line is different from the equipment operation condition; Most tests all are under low pressure has the situation of electromagnetic interference (EMI), not carry out; Possibly can't find potential defective and fault like this; On the other hand, though the cycle of the regular preventive trial of off-line have statistical, discovery fault that can not be accurately and timely.Therefore, on-line testing can improve the verification and the monitoring means of mutual inductor, and this field does not still have the concerned countries standard and company standard is put into effect, and it is blank that the research in this field still belongs to.
China's utility model patent " a kind of electronic type high-tension current inductor " (application number: 200720126458.7 applyings date: 2007-11-21) and patent of invention " a kind of high-accuracy open type Rogowski coil " (application number: the 200910065785.X applying date: 2009-08-14) disclosed; Only relate to online electric mutual inductor and high precision pcb board formula mutual inductor (its precision can reach 0.05 grade), do not address on-line testing current transformer content.
Summary of the invention
The objective of the invention is problem to the background technology proposition; A kind of high-tension current inductor on-line testing method is disclosed; Utilize the pincerlike air core coil of pin-point accuracy to be the normalized current sensor, under power-off condition not, the operating high-tension current inductor in scene is realized the pin-point accuracy verification; Reduce loss of outage, shortened the check-verifying period of high-tension current inductor.
Technical scheme of the present invention is: a kind of high-tension current inductor on-line testing method; It is characterized in that: in by verification high-tension current sensor loop; Connect one be the normalized current sensor based on the pincerlike air core coil of the pin-point accuracy of pcb board, through Optical Fiber Transmission with the high-side signal digitizing and be transferred to low-pressure side; Compare with the normalized current sensor output value of synchronization with by school high-tension current sensor output value through the external sync trigger pip; In the verification platform, realize digital integration algorithm and theory of errors algorithm with virtual instrument, examine and determine on-the-spot move by the accuracy of school high-tension current sensor.Its beneficial effect is: can realize the high-tension current inductor on-line testing of total digitalization, accuracy is high, and real-time is good, has improved the reliability of electric system primary equipment greatly.
The high-tension current inductor on-line testing device that aforesaid high-tension current inductor on-line testing method adopts, according to the verification rule mainly be divided into standard channel, by school passage and verification platform three parts, respectively as follows:
1. the sensing head of normalized current sensor adopts the pincerlike air core coil based on pcb board.It is wide that this sensing head has dynamic range, bandwidth, and advantages such as no magnetic saturation are to use one of the most ripe electronic current mutual inductor.Air core coil is with measuring a kind of current sensor of lead on the framework of the uniform nonmagnetic substance in cross section.When making the shape of pincerlike structure, the magnetic permeability basically identical of magnetic permeability in the opening air gap and non magnetic skeleton can not influence the distribution of magnetic field in coil that primary current produces, and therefore is fit to make out the pincerlike loop construction of air gap.In addition, air core coil has iron core or not, does not have the magnetic circuit saturation problem of iron core, and response speed is fast, with advantages such as circuit-under-test directly contact, does not make that it can hot line job on high-tension bus-bar.
2. the normalized current sensor is made up of sensing head, high-pressure side data acquisition module and local data receiver module.Sensor head is based on the pincerlike air core coil of pcb board; The high-pressure side data conversion module is receiving after this locality accepts the synchronizing signal of module; The differential signal of air core coil output is amplified, after A/D (Analog to Digital) conversion changes with electric light, through the optical fiber sending module data sent to the local data receiver module.
3. comprised by school mutual inductor output modular converter and local data receiver module by the school passage.Comprised shunt by school mutual inductor output modular converter, analog to digital conversion and electric light conversion.The current signal that to be exported 0 ~ 5A or 0 ~ 1A through shunt by the school current transformer converts low voltage signal into, and A/D conversion and electric light conversion back send to the local data receiver module through the optical fiber sending module with data.
4. the verification platform is portable industrial pc and the virtual instrument platform formed based on the software programming language of Labview.The communication interface of verification platform through RS-232 receives standard channel that the local data receiver module sends over and by the data of school passage, then the data of standard channel done digital integration, the data of two passages are carried out Error Calculation and waveform shows and data recording.
High-tension current inductor on-line testing method of the present invention, on-line testing, data monitoring, record and the waveform that can be implemented in high-tension current inductor under the power-off condition not show.
Description of drawings
Accompanying drawing 1 constitutes block diagram for embodiment of the invention work system;
Accompanying drawing 2 is an embodiment of the invention principle schematic;
Accompanying drawing 3 is an embodiment of the invention standard channel hardware system block diagram;
Accompanying drawing 4 is that the embodiment of the invention is by school channel hardware system chart;
Accompanying drawing 5 is the air core coil sensing head outside drawing of pincerlike pcb board.
Embodiment
Below in conjunction with accompanying drawing inventive embodiments is described further:
As shown in Figure 1, the present invention forms by standard channel with by school passage and verification platform.Standard channel mainly comprises normalized current sensor 1; High-pressure side data transmission blocks 2; Comprised by school mutual inductor output modular converter 3 and local data receiver module 4 that by the school passage verification platform 5 is that the software of industrial computer and virtual instrument is formed, 6 is data transmission optical fiber.
As shown in Figure 2, the present invention is through by the normalized current sensor of known accuracy with by the contrast of school high-tension current inductor in the synchronization output valve, examine and determine on-the-spot operation by the device of the parameters of school high-tension current inductor.Its principle of work is following: the sensing head of normalized current sensor adopts based on the pincerlike air core coil of the pin-point accuracy of pcb board, and the voltage signal of its output becomes digital signal through the high-side signal acquisition module.The high-side signal acquisition module mainly comprises preposition amplification, analog to digital conversion and electric light conversion; Differential signal with standard transducer output after receiving synchronizing signal carries out preposition amplification, A/D converts digital signal to, becomes light signal to send to the local reception module data-switching through the optical fiber sending module again.By the school current transformer is the current signal that electromagnetic current transducer is output as 0 ~ 5A, converts output into voltage signal through the I/V converter and outputs to the low-side signal acquisition module.Mainly comprised analog to digital conversion and electric light conversion by school mutual inductor output modular converter, after receiving synchronizing signal,, convert light signal into and be delivered to the local reception module the voltage signal sampling of I/V converter output.The local reception module comprises that mainly synchronous clock sends opto-electronic conversion and laser powered sensor.Be that the two-way module sends synchronizing signal, the energy supply of high-side signal acquisition module with receive two paths and send the data of returning, send in the host computer virtual instrument verification platform with the communication interface standard of RS-232 and accomplish signal Processing, Error Calculation and diagnosis.
As shown in Figure 3, standard channel hardware comprises high-side signal acquisition module and local reception module, and its principle of work is following: the local reception module is provided laser powered sensor for the high-side signal acquisition module, sends the triggering synchronous pulse through uplink optical fibers; The high-side signal acquisition module is sampled after receiving synchronizing pulse, and transmits data through downlink optical fiber to the local reception module, and its power supply mode is the mode of light power supply.The local reception module comprises reception high-pressure side data and communicates by letter with host computer.Local reception module acceptance criteria passage with by the communication data of school passage two-way, send to industrial computer alternately through RS-232.
As shown in Figure 4; Comprised by school mutual inductor output modular converter and local data receiver module by the school channel hardware; Its principle of work and standard channel basically identical; Its key distinction is: not in the high-pressure side, do not needed the light power supply by school mutual inductor output modular converter, can directly insert the power supply of 220V power supply.By verification electric current current transformer is high-tension current inductor, is output as current signal, therefore needs the I/V converter that current conversion is become voltage signal.
Referring to accompanying drawing 5,10-gripping mechanism among the figure, 11-commissure; 12, outlet terminal is implemented on-line testing because the present invention is intended to not influence under the situation of primary side wiring to the high-tension current inductor of scene operation; The normalized current Sensor Design is pincerlike pcb board air core coil, and the shell of standard transducer is full aluminium shielding case, has the effect of electric field shielding and high frequency magnetic field shielding; The internal layer Machine Design is divided into two-layer, and one deck is the pcb board air core coil of opening, and another layer is being fixed high-pressure side acquisition module and laser energy supply receiving circuit; Whole aluminium box totally enclosed type design, output signal are optical fiber output signal, external insulator; Aluminum hull design another one important effect is fixing, and this aluminum hull design can make the open stich air gap be closely linked, and guarantees that closed after-opening air gap is less than 0.1mm; On the other hand, can play fixedly current, avoid the offset of the eccentric off-axis equipotential of conductor vibrations causing coil to move in the effect of coil center.
In the use, at first the each several part connecting line is connected, again normalized current sensor senses head is snapped on the high-voltage conducting wires, fasten gripping mechanism 10 again, can carry out verification.
Claims (1)
1. high-tension current inductor on-line testing method; It is characterized in that: in by verification high-tension current sensor loop; Connect one be the normalized current sensor based on the pincerlike air core coil of the pin-point accuracy of pcb board, through Optical Fiber Transmission with the high-side signal digitizing and be transferred to low-pressure side; Compare with the normalized current sensor output value of synchronization with by school high-tension current sensor output value through the external sync trigger pip; In the verification platform, realize digital integration algorithm and theory of errors algorithm with virtual instrument, examine and determine on-the-spot move by the accuracy of school high-tension current sensor.
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| CN2011103508375A CN102401889A (en) | 2011-11-08 | 2011-11-08 | Online checking method for high-tension current transformer |
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| CN2011103508375A CN102401889A (en) | 2011-11-08 | 2011-11-08 | Online checking method for high-tension current transformer |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336262A (en) * | 2013-05-30 | 2013-10-02 | 中国电力科学研究院 | Online live calibration device for mutual inductor |
| CN103616651A (en) * | 2013-04-01 | 2014-03-05 | 湖北迅迪科技有限公司 | On-site verification apparatus for optical fiber current sensor |
| CN103630866A (en) * | 2013-09-09 | 2014-03-12 | 国家电网公司 | Transient characteristic detection system and transient characteristic detection method for electronic voltage transformers |
| CN103630867A (en) * | 2013-12-06 | 2014-03-12 | 国家电网公司 | Mutual inductor electrified verifying device |
| WO2014194514A1 (en) * | 2013-06-07 | 2014-12-11 | 国家电网公司 | Heavy ac current calibration system based on self-calibration principle of coefficient of mutual induction of hollow coil |
| CN105911503A (en) * | 2016-07-08 | 2016-08-31 | 中国能源建设集团湖南省电力设计院有限公司 | On-line verification system for all-fiber optical current transformer |
| CN110763880A (en) * | 2019-12-05 | 2020-02-07 | 国网天津市电力公司 | Variable-caliber multifunctional high-voltage test clamp |
| CN111044966A (en) * | 2019-12-23 | 2020-04-21 | 中国电力科学研究院有限公司 | Electronic current transformer live detection system and method |
| CN112986889A (en) * | 2020-12-08 | 2021-06-18 | 浙江武义电气安装工程有限公司 | System and method for checking current transformer for distribution network |
| US11536786B2 (en) * | 2019-01-28 | 2022-12-27 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for data transmission in imaging system |
| CN116381590A (en) * | 2023-06-07 | 2023-07-04 | 云南电网有限责任公司 | Current transformer electrified checking system, self-calibration method and use method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616651A (en) * | 2013-04-01 | 2014-03-05 | 湖北迅迪科技有限公司 | On-site verification apparatus for optical fiber current sensor |
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| CN103630867A (en) * | 2013-12-06 | 2014-03-12 | 国家电网公司 | Mutual inductor electrified verifying device |
| CN105911503A (en) * | 2016-07-08 | 2016-08-31 | 中国能源建设集团湖南省电力设计院有限公司 | On-line verification system for all-fiber optical current transformer |
| US11536786B2 (en) * | 2019-01-28 | 2022-12-27 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for data transmission in imaging system |
| US11940514B2 (en) | 2019-01-28 | 2024-03-26 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for data transmission in imaging system |
| CN110763880A (en) * | 2019-12-05 | 2020-02-07 | 国网天津市电力公司 | Variable-caliber multifunctional high-voltage test clamp |
| CN111044966A (en) * | 2019-12-23 | 2020-04-21 | 中国电力科学研究院有限公司 | Electronic current transformer live detection system and method |
| CN112986889A (en) * | 2020-12-08 | 2021-06-18 | 浙江武义电气安装工程有限公司 | System and method for checking current transformer for distribution network |
| CN116381590A (en) * | 2023-06-07 | 2023-07-04 | 云南电网有限责任公司 | Current transformer electrified checking system, self-calibration method and use method |
| CN116381590B (en) * | 2023-06-07 | 2023-09-19 | 云南电网有限责任公司 | Current transformer electrified checking system, self-calibration method and use method |
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Application publication date: 20120404 |