CN110441593A - A kind of Rogowski coil current signal acquisition system and acquisition method - Google Patents
A kind of Rogowski coil current signal acquisition system and acquisition method Download PDFInfo
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- CN110441593A CN110441593A CN201910878219.4A CN201910878219A CN110441593A CN 110441593 A CN110441593 A CN 110441593A CN 201910878219 A CN201910878219 A CN 201910878219A CN 110441593 A CN110441593 A CN 110441593A
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- rogowski coil
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000010354 integration Effects 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 201000010099 disease Diseases 0.000 abstract description 4
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000001052 transient effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of Rogowski coil current signal acquisition system and acquisition methods, including passive low ventilating filter, AD conversion module and fpga chip, the input terminal of passive low ventilating filter is connected with Rogowski coil differential signal input terminal, passive low ventilating filter output end is connected with AD conversion module input terminal, and AD conversion module output end is connected with fpga chip input terminal；Fpga chip is connected with the current signal output end after Rogowski coil hardware integrated signal output end and Software Integration reduction.Sampling circuit of the present invention uses the front-end sampling system of passive low-pass filter and AD conversion module, ensure that filter circuit has good high frequency characteristics while filtering out external interference signals；The AD sampling module of high-speed, high precision can guarantee the precision and validity of the progress of disease in sampling circuit of original differential signal, to improve the reliability of later period software algorithm processing.
Description
Technical field
The invention belongs to power technology smart grid field more particularly to a kind of Rogowski coil current signal acquisition system and
Acquisition method.
Background technique
In the application of electronic current mutual inductor, since Rogowski coil has fast response time, almost without phase mistake
Difference, will not be saturated, electric current can real-time measurement etc. feature, the electronic current mutual inductor based on Rogowski coil is in the power system
It is widely used.Since Rogowski coil is loop coil of the uniform winding on nonferromugnetic material, output
Signal is the differential of Current versus time, needs to carry out the circuit of integral reduction by a voltage signal to output again, just may be used
Really to restore input current.
The electronic current mutual inductor based on Rogowski coil applied at present, it is single generally by acquisition unit or acquisition
The combining unit of first rear end carries out integral reduction treatment to wechat signal, then the current signal after output reduction.But due to
Limited by sample frequency, in failure or VFTO(fast transient overvoltage) during, the progress of disease bandwidth of higher hamonic wave is limited,
The problem of current signal is distorted after integral reduction is than more prominent.
Based on current application scheme, since the signal of acquisition unit or combining unit output only passes through integral all the way
Current signal after reduction lacks and the signal of reference is compared therewith, can not be to integrating when integral process is there are when problem
The problem is compared in journey.
Summary of the invention
The technical problem to be solved by the present invention is a kind of Rogowski coil current signal acquisition system and acquisition method are provided,
With solve the prior art be only capable of output all the way integral reduction after current signal, cannot in acquisition circuit integral element occur
The problems such as problem is compared.
The technical scheme adopted by the invention is as follows: a kind of Rogowski coil current signal acquisition system, including passive low-pass filter
Device, AD conversion module and fpga chip, the input terminal of passive low ventilating filter are connected with Rogowski coil differential signal input terminal, nothing
Source first low pass filter output is connected with AD conversion module input terminal, AD conversion module output end and fpga chip input terminal phase
Connection；Fpga chip is connected with the current signal output after Rogowski coil hardware integrated signal output end and Software Integration reduction
End.
AD conversion module uses high-speed, high precision converter.
A kind of acquisition method of Rogowski coil current signal acquisition system, this method are as follows: when the number of AD conversion module sampling
After word differential signal enters fpga chip, the input sample value at current time is obtained first, by calculating sampled value software simultaneously
Then processing is compared in two data by integration data and sampled value hardware integration data, by error contrast judgement whether
For normal condition, if error is greater than given threshold, judgement unanimously exports the calculating integrated signal without error flag position simultaneously
With sampled value hardware integrated signal；Conversely, judgement is inconsistent, then output takes the calculating integrated signal and hardware of error flag position
Integrated signal.
Beneficial effects of the present invention: compared with prior art, effect of the invention is as follows:
(1) sampling circuit uses the front-end sampling system of passive low-pass filter and AD conversion module, is filtering out external interference signals
While ensure that filter circuit have good high frequency characteristics；The AD sampling module of high-speed, high precision can guarantee original differential
The precision and validity of signal progress of disease in sampling circuit, to improve the reliability of later period software algorithm processing；
(2) hardware integrated signal is that collector is original in input with current signal real time contrast's analytical technology that Software Integration restores
After differential signal, while Software Integration algorithm and hardware integrated signal are carried out, by the electricity after Software Integration reduction in FPGA
It flows signal and hardware integrated signal carries out real time contrast's analysis, the validity after ensure that integral recovering signal；
(3) hardware integrated signal and Software Integration signal output loop simultaneously.In acquisition circuit output end, it is provided simultaneously with software product
Divide reduction current signal output port and hardware integrated signal output port, hardware integrated signal passes through internal control and exports, protects
The synchronism of card integral recovering signal and hardware integrated signal, can provide the ratio logarithm of real-time synchronization for the recording device of rear end
According to.
Detailed description of the invention
Fig. 1 is sampling circuit hardware schematic of the present invention；
Fig. 2 is invention software algorithm flow chart.
Specific embodiment
With reference to the accompanying drawing and the present invention is described further in specific embodiment.
Embodiment 1: as Figure 1-Figure 2, a kind of Rogowski coil current signal acquisition system, including it is power module 1, passive
Low-pass filter 3, AD conversion module 4 and fpga chip 5, power module 1 are powered to passive low ventilating filter 3 and fpga chip 5,
The input terminal of passive low ventilating filter 3 is connected with Rogowski coil differential signal input terminal 2,3 output end of passive low ventilating filter with
4 input terminal of AD conversion module is connected, and 4 output end of AD conversion module is connected with 5 input terminal of fpga chip；Fpga chip 5 connects
Current signal output end 7 after being connected to Rogowski coil hardware integrated signal output end 6 and Software Integration reduction.
AD conversion module 4 uses high-speed, high precision converter.
The original differential signal of Rogowski coil output carries out hardware filtering processing by passive low ventilating filter, filters out interference
After high frequency spurs, wherein differential signal is by high-speed, high precision AD conversion module progress analog/digital conversion all the way, by original differential
Signal switchs to digital quantity, and digital differential signal enters fpga chip and handled, including carries out software product to digital differential signal
Point, integrated signal comparison etc.；Another way differential signal after hardware integrates by high-speed, high precision AD conversion module carry out mould/
Number conversion, the signal after hardware is integrated switch to digital quantity, and then also access fpga chip is handled.Last fpga chip is defeated
Outlet exports two kinds of signals: the current signal after Rogowski coil hardware integrated signal and Software Integration reduction simultaneously；Power module
For the power supply of entire acquisition circuit.
In Rogowski coil mutual inductor use process, the original differential signal of Rogowski coil output passes through acquisition circuit, will
Differential signal exports after carrying out Integral Processing reduction to rear end.But due to being limited by sample frequency, in failure or VFTO
During (fast transient overvoltage), the progress of disease bandwidth of higher hamonic wave is limited, and what current signal was distorted after integral reduction asks
Topic is than more prominent.Therefore by improveing to acquisition circuit, acquisition circuit is on the one hand allowed to export two-way integrated signal,
On the other hand it is compared in real time in fpga chip.Compared with the prior art, the present invention passes through output software integral simultaneously
Current signal and Rogowski coil hardware integrated signal after reduction, so as to effectively monitor and judge in failure or VFTO
During (fast transient overvoltage), distortion situation of the current signal after integral reduction can effectively improve Rogowski coil electricity
Reliability of the current transformer in engineer application.
Embodiment 2: as Figure 1-Figure 2, a kind of acquisition method of Rogowski coil current signal acquisition system, this method
Are as follows: after the digital differential signal of AD conversion module sampling enters fpga chip, the input sample value at current time is obtained first,
By calculating sampled value Software Integration data and sampled value hardware integration data simultaneously, place then is compared in two data
Whether reason, be normal condition by error contrast judgement, if error is greater than given threshold, judges consistent output simultaneously not tape error
The accidentally calculating integrated signal and sampled value hardware integrated signal of flag bit；Conversely, judgement is inconsistent, then output takes error flag
The calculating integrated signal and hardware integrated signal of position.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Within protection scope of the present invention, therefore, protection scope of the present invention should be based on the protection scope of the described claims lid.
Claims (3)
1. a kind of Rogowski coil current signal acquisition system, it is characterised in that: including power module (1), passive low ventilating filter
(3), AD conversion module (4) and fpga chip (5), the input terminal of passive low ventilating filter (3) are connected with Rogowski coil differential letter
Number input terminal (2), passive low ventilating filter (3) output end are connected with AD conversion module (4) input terminal, AD conversion module (4)
Output end is connected with fpga chip (5) input terminal；Fpga chip (5) is connected with Rogowski coil hardware integrated signal output end
(6) and Software Integration reduction after current signal output end (7).
2. a kind of Rogowski coil current signal acquisition system according to claim 1, it is characterised in that: AD conversion module
(4) high-speed, high precision converter is used.
3. a kind of acquisition method of Rogowski coil current signal acquisition system according to claim 1 to 2, feature
It is: this method are as follows: after the digital differential signal of AD conversion module sampling enters fpga chip, obtain current time first
Input sample value, by calculating sampled value Software Integration data and sampled value hardware integration data simultaneously, then by two data
Processing is compared, whether is normal condition by error contrast judgement, if error is greater than given threshold, judgement is consistent simultaneously
Export the calculating integrated signal and sampled value hardware integrated signal without error flag position；Conversely, judgement is inconsistent, then band is exported
The calculating integrated signal and hardware integrated signal of upper error flag position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910878219.4A CN110441593A (en) | 2019-09-17 | 2019-09-17 | A kind of Rogowski coil current signal acquisition system and acquisition method |
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| CN201910878219.4A CN110441593A (en) | 2019-09-17 | 2019-09-17 | A kind of Rogowski coil current signal acquisition system and acquisition method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579853A (en) * | 2020-03-20 | 2020-08-25 | 国家电网有限公司 | Device and method for pure software integration algorithm of Rogowski coil |
| CN111707867A (en) * | 2020-06-23 | 2020-09-25 | 南京能瑞自动化设备股份有限公司 | Alternating current measuring method and device, electronic equipment and storage medium |
| CN113093084A (en) * | 2021-03-26 | 2021-07-09 | 天津市职业大学 | Online detection system and detection method for internal resistance and on-off performance of Rogowski coil |
| CN113359188A (en) * | 2021-05-01 | 2021-09-07 | 西安电子科技大学 | Underground cable identification system and method for improving detection precision |
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| CN103969536A (en) * | 2014-06-04 | 2014-08-06 | 贵州电力试验研究院 | Transient characteristic test system and method of mutual inductor based on digital simulation of Rogowski coil |
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| CN107490719A (en) * | 2017-08-09 | 2017-12-19 | 国网山东省电力公司经济技术研究院 | Electronic mutual inductor based on Rogowski coil principle in GIS |
| CN107505500A (en) * | 2017-08-09 | 2017-12-22 | 国网山东省电力公司经济技术研究院 | Electronic mutual inductor integration method in GIS |
| CN210720561U (en) * | 2019-09-17 | 2020-06-09 | 贵州电网有限责任公司 | Rogowski coil current signal acquisition system |
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2019
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| CN103513093A (en) * | 2013-09-17 | 2014-01-15 | 国家电网公司 | Electronic transformer collector based on 4-order Bessel filtration and software integration |
| CN103969536A (en) * | 2014-06-04 | 2014-08-06 | 贵州电力试验研究院 | Transient characteristic test system and method of mutual inductor based on digital simulation of Rogowski coil |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579853A (en) * | 2020-03-20 | 2020-08-25 | 国家电网有限公司 | Device and method for pure software integration algorithm of Rogowski coil |
| CN111707867A (en) * | 2020-06-23 | 2020-09-25 | 南京能瑞自动化设备股份有限公司 | Alternating current measuring method and device, electronic equipment and storage medium |
| CN111707867B (en) * | 2020-06-23 | 2022-09-13 | 南京能瑞自动化设备股份有限公司 | Alternating current measuring method and device, electronic equipment and storage medium |
| CN113093084A (en) * | 2021-03-26 | 2021-07-09 | 天津市职业大学 | Online detection system and detection method for internal resistance and on-off performance of Rogowski coil |
| CN113093084B (en) * | 2021-03-26 | 2022-11-15 | 天津市职业大学 | Online detection system and detection method for internal resistance and on-off performance of Rogowski coil |
| CN113359188A (en) * | 2021-05-01 | 2021-09-07 | 西安电子科技大学 | Underground cable identification system and method for improving detection precision |
| CN113359188B (en) * | 2021-05-01 | 2024-05-03 | 西安电子科技大学 | Underground cable identification system and method for improving detection precision |
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