CN102128966B - Rogowski coil-based integrator circuit for electronic current transformer - Google Patents
Rogowski coil-based integrator circuit for electronic current transformer Download PDFInfo
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- CN102128966B CN102128966B CN2011100042208A CN201110004220A CN102128966B CN 102128966 B CN102128966 B CN 102128966B CN 2011100042208 A CN2011100042208 A CN 2011100042208A CN 201110004220 A CN201110004220 A CN 201110004220A CN 102128966 B CN102128966 B CN 102128966B
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Abstract
The invention relates to a Rogowski coil-based integrator circuit for an electronic current transformer. The integrator circuit consists of a Rogowski coil, a low-frequency gain planarization analog integrator and a signal processing circuit, wherein the Rogowski coil is used for outputting a transient signal to the low-frequency gain planarization analog integrator and outputting a steady-state signal to the signal processing circuit; the low-frequency gain planarization analog integrator is used for processing the transient signal output by the Rogowski coil and is connected with the Rogowski coil and the signal processing circuit; and the signal processing circuit is used for processing an output signal of the low-frequency gain planarization analog integrator and performing digital integration on the steady-state signal output by the Rogowski coil, and then the processed signal is transmitted to a protecting channel and a metering channel through an output interface circuit. The integrator circuit has the advantages of measuring the steady-state signal with high precision, quickly responding to the transient signal, and providing measurement data of the protecting channel and the metering channel at the same time through one Rogowski coil, along with high temperature stability and vibration resistance.
Description
Technical field
The present invention relates to a kind of integrator circuit, relate in particular to a kind of electronic current mutual inductor and use integrator circuit, belong to the current measurement techniques field based on Luo-coil.
Background technology
In the research of electronic current mutual inductor, Luo-coil has obtained paying close attention to widely as the primary current sensing unit.In the measurement to alternating current, the secondary output voltage signal of Luo-coil is the differential to the primary current signal.If recover and the proportional signal of primary current, must add corresponding integral element.Therefore, integrator circuit is key components wherein in based on the electronic mutual inductor of Luo-coil.
The reason that influences the Luo-coil accuracy of measurement mainly contains two: the one, and the mounting structure when characteristic of himself and measurement electric current causes the variation of its structural parameters etc. like manufacture craft; The 2nd, the accuracy of integral element.Along with to the deepening continuously of Luo-coil geometrical property research, the error that causes because of himself characteristic has obtained very big improvement, like structural parameters etc.The integrating circuit of Luo-coil current sensor mainly contains two kinds of implementations: analogue integrator and digital integrator; Wherein, It is fast that analogue integrator has response speed, and be prone to the characteristics of realization, is the comparison difficulty but will reach high accuracy with stability.Particularly the frequency when signal is lower, amplitude is less and integral time when longer, and the characteristic of components and parts such as integrating capacitor, resistance etc. in time in the integrator, the drift of temperature etc. will have a strong impact on the effect of integration, and then reduce the accuracy of measurement of system; The amplifier self characteristics also can have a strong impact on the characteristic of integrator, as limited open-loop gain, input offset voltage and temperature thereof float, input bias current etc.Under a stable condition, the offset voltage of amplifier is constant, can adopt suitable zeroing circuit to recompense; But its offset drift, particularly temperature is floated generally and can't be eliminated fully.In addition, the phase response of the low-frequency noise in the circuit, voltage drift and integrating circuit also is the main cause that influences the integration performance.So analogue integrator can be used for the measurement of the big electric current of impact with the characteristics of himself, reaches very pin-point accuracy in the long-time running and in the measurement to power current, be difficult in.This also is present electronic current mutual inductor not high one of the main reasons of accuracy of measurement in long-time running based on Luo-coil.Digital integrator is realized relative complex, and its performance does not receive the time of components and parts, the influence of temperature drift characteristic, can realize the accurate measurement to steady-state signal.But it is very difficult to adopt digital integrator to realize the measurement of transient signal, only can be used for accuracy of measurement is required height, but the occasion not high to the transient response characteristic requirements.
As far as being applied to the Luo-coil of electronic current mutual inductor; Because its tested electric current belongs to the category of low-frequency current; Wanting is that protection and metering outfit provide transient state and steady-state signal simultaneously, will be very crucial to the design of its integral element, and have suitable difficulty.Under this background, the present invention adopt a kind of based on the low-frequency gain planarization analogue integrator and realize only adopting a Luo-coil can be simultaneously the integrator circuit of transient state and steady-state signal to be provided for protection and metering outfit based on the digital integrator of complexification Simpson formula and digital signal processor.
Summary of the invention
Provide a kind of electronic current mutual inductor to use integrator circuit in order to solve the problems of the technologies described above the present invention based on Luo-coil; Purpose is to be used for the integral element of Luo-coil with the analogue integrator of low-frequency gain planarization with based on the digital integrator of complexification Simpson formula and digital signal processor, accelerates slewing rate, increases strong anti-interference ability and accuracy of measurement.
Use integrator circuit for reaching the electronic current mutual inductor that above-mentioned purpose the present invention is based on Luo-coil; Be made up of following structure: Luo-coil is used for to the transient signal of low-frequency gain planarization analogue integrator output with to signal processing circuit output steady-state signal; Low-frequency gain planarization analogue integrator is used to handle the transient signal that Luo-coil is exported, and links to each other with signal processing circuit with Luo-coil; Signal processing circuit is used to handle the output signal of low-frequency gain planarization analogue integrator, and the output steady-state signal of Luo-coil is carried out digital integration handle, and the signal after the processing is seen off to protection passage and measurement channel data through output interface circuit.
Described low-frequency gain planarization analogue integrator is made up of following structure: operational amplifier, and the in-phase end of operational amplifier links to each other with an end of second resistance, the other end ground connection of second resistance; First resistance is connected between the end of oppisite phase of Luo-coil and operational amplifier; Be connected between the end of oppisite phase and output terminal of operational amplifier after the 3rd resistance and the series connection of the 4th resistance; First electric capacity is connected between the end of oppisite phase and output terminal of operational amplifier; Second electric capacity is connected between the tie point and ground of the 3rd resistance and the 4th resistance.
Described signal processing circuit is made up of the first analog and digital signal converter, digital integrator and interface circuit; The output conversion of signals that the first analog and digital signal converter is used for low-frequency gain planarization analogue integrator is a digital signal; Digital integrator carries out digital integration with the output signal of Luo-coil; Interface circuit is delivered to measurement channel and protection passage with the output of digital integrator and the output of low-frequency gain planarization analogue integrator.
Described digital integrator is made up of the second analog and digital signal converter, first Hi-pass filter, second Hi-pass filter and totalizer; The second analog and digital signal converter links to each other with first Hi-pass filter with Luo-coil respectively; Totalizer links to each other with second Hi-pass filter with first Hi-pass filter respectively; Second Hi-pass filter links to each other with output interface circuit.
Advantageous effect of the present invention:
1, the protection passage based on the electronic current mutual inductor of Luo-coil adopts a kind of analogue integrator based on the low-frequency gain planarization to realize; In this analogue integrator; The introducing of second integral electric capacity can be optimized the low frequency characteristic of integrator greatly; In measurement, have good transient characterisitics to the big electric current of power frequency.
2, employing realizes the measurement to the stable state low-frequency current signal based on the digital integrator of complexification Simpson formula in the circuit of the present invention, for metering outfit provides signal; Can overcome that the components and parts temperature is floated, time floats the integrator Effect on Performance, realizes the accurate measurement to power current.
3, the accuracy of measurement of circuit of the present invention is high, transient performance is good; The measurement channel signal measurement error that digital integrator provides is less than 0.1%; The protection channel measurement accuracy level that low-frequency gain planarization analogue integrator provides is inferior to be superior to 5TPE, and time resolution characteristics are less than 0.1ms.
4, circuit of the present invention has excellent temperature stability and anti-vibration characteristic, and in-40 ℃ ~+80 ℃ range of temperature, the measuring error that the digitized measurement system causes because of temperature variation is less than ± 0.05%; External vibration can not have any impact to the accuracy of measurement mechanism.
Of the present invention can the realization measured the pin-point accuracy of steady-state signal; Can realize quick response again to transient signal; Adopt a Luo-coil, can provide protection simultaneously and measure two channel measurement data, and have excellent temperature stability and anti-vibration characteristic.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is the circuit diagram of the low-frequency gain planarization analogue integrator among the present invention.
Fig. 3 is the circuit diagram of the signal processing circuit among the present invention.
Fig. 4 is the circuit diagram based on the digital integrator of complexification Simpson formula among the present invention.
Among the figure: 1, Luo-coil; 2, low-frequency gain planarization analogue integrator; 3, signal processing circuit; 4, the first analog and digital signal converter; 5, digital integrator; 6, interface circuit; 7, protection passage; 8, measurement channel; 9, the second analog and digital signal converter; 10, first Hi-pass filter; 11, totalizer; 12, second Hi-pass filter; U21, operational amplifier; R21, first resistance; R22, second resistance; R23, the 3rd resistance; R24, the 4th resistance; C21, first electric capacity; C22, second electric capacity.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.
The electronic current mutual inductor that the present invention is based on Luo-coil as shown in Figure 1 is used integrator circuit; Be made up of following structure: Luo-coil 1 is used for to the transient signal of low-frequency gain planarization analogue integrator 2 outputs with to signal processing circuit 3 output steady-state signals; Low-frequency gain planarization analogue integrator 2 is used to handle the transient signal that Luo-coil 1 is exported, and links to each other with signal processing circuit 3 with Luo-coil 1; Signal processing circuit 3; Be used to handle the output signal of low-frequency gain planarization analogue integrator 2; And the output steady-state signal of Luo-coil 1 is carried out digital integration handle, the signal after the processing is seen off with measurement channel 8 data to protection passage 7 through output interface circuit 6.
Low-frequency gain planarization analogue integrator as shown in Figure 22 is made up of following structure: operational amplifier U21, and the in-phase end of operational amplifier U21 links to each other the other end ground connection of second resistance R 22 with second resistance R, 22 1 ends; First resistance R 21 is connected between the end of oppisite phase of Luo-coil 1 and operational amplifier U21; Be connected between the end of oppisite phase and output terminal of operational amplifier U21 after the 3rd resistance R 23 and 24 series connection of the 4th resistance R; First capacitor C 21 is connected between the end of oppisite phase and output terminal of operational amplifier U21; Second capacitor C 22 is connected between the tie point and ground of the 3rd resistance R 23 and the 4th resistance R 24.
The OP27 of the Analog Device company that operational amplifier U21 adopts; The resistance of first resistance R 21 is 100 k Ω, and second resistance R, 22 resistances are 80 k Ω, and the resistance of the 3rd resistance R 23 and the 4th resistance R 24 is 250 k Ω, and the temperature coefficient of above-mentioned resistance is all less than 10 * 10
-6/ ℃.The appearance value of first capacitor C 21 is 39nF, and the appearance value of second capacitor C 22 is 1.5 μ F.
The AD7663 of the Analog Device company that the first analog and digital signal converter 4 adopts, that interface circuit 6 adopts is the EP1C6 of U.S. altera corp.
The AD7663 of the Analog Device company that the second analog and digital signal converter 9 adopts; First Hi-pass filter 10, second Hi-pass filter 12 and totalizer 11 adopt American TI Company TMS320F2407 to realize; The implementation algorithm that adopts is the complexification Simpson formula, and its difference equation is:
The signal of Luo-coil output offers protection and metering outfit respectively by output interface circuit 6 after handling through low-frequency gain planarization analogue integrator 2 and digital integrator 5 respectively again, supplies relay protection of power system and electric energy metrical used.
Claims (3)
1. use integrator circuit based on the electronic current mutual inductor of Luo-coil, it is characterized in that being made up of following structure: Luo-coil is used for to low-frequency gain planarization analogue integrator output transient signal with to signal processing circuit output steady-state signal; Low-frequency gain planarization analogue integrator is used to handle the transient signal that Luo-coil is exported, and links to each other with signal processing circuit with Luo-coil; Signal processing circuit is used to handle the output signal of low-frequency gain planarization analogue integrator, and the output steady-state signal of Luo-coil is carried out digital integration handle, and the signal after the processing transmits data through output interface circuit to protection passage and measurement channel; Described low-frequency gain planarization analogue integrator is made up of following structure: operational amplifier, and the in-phase end of operational amplifier links to each other with an end of second resistance, the other end ground connection of second resistance; First resistance is connected between the end of oppisite phase of Luo-coil and operational amplifier; Be connected between the end of oppisite phase and output terminal of operational amplifier after the 3rd resistance and the series connection of the 4th resistance; First electric capacity is connected between the end of oppisite phase and output terminal of operational amplifier; Second electric capacity is connected between the tie point and ground of the 3rd resistance and the 4th resistance.
2. the electronic current mutual inductor based on Luo-coil according to claim 1 is used integrator circuit, it is characterized in that described signal processing circuit is made up of the first analog and digital signal converter, digital integrator and interface circuit; The output conversion of signals that the first analog and digital signal converter is used for low-frequency gain planarization analogue integrator is a digital signal; Digital integrator carries out digital integration with the output signal of Luo-coil; Interface circuit is delivered to measurement channel and protection passage with the output of digital integrator and the output of low-frequency gain planarization analogue integrator.
3. the electronic current mutual inductor based on Luo-coil according to claim 2 is used integrator circuit; It is characterized in that described digital integrator, constitute by the second analog and digital signal converter, first Hi-pass filter, second Hi-pass filter and totalizer; The second analog and digital signal converter links to each other with first Hi-pass filter with Luo-coil respectively; Totalizer links to each other with second Hi-pass filter with first Hi-pass filter respectively; Second Hi-pass filter links to each other with interface circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011100042208A CN102128966B (en) | 2011-01-11 | 2011-01-11 | Rogowski coil-based integrator circuit for electronic current transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100042208A CN102128966B (en) | 2011-01-11 | 2011-01-11 | Rogowski coil-based integrator circuit for electronic current transformer |
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| CN102128966A CN102128966A (en) | 2011-07-20 |
| CN102128966B true CN102128966B (en) | 2012-07-11 |
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| CN2011100042208A Expired - Fee Related CN102128966B (en) | 2011-01-11 | 2011-01-11 | Rogowski coil-based integrator circuit for electronic current transformer |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102435827A (en) * | 2011-09-15 | 2012-05-02 | 西安交通大学 | Rogowski coil-based method and Rogowski coil-based device for detecting direct-current short-circuit current fault |
| CN102445588B (en) * | 2011-11-23 | 2015-08-19 | 中国人民解放军海军工程大学 | The gradual in short-term heavy-current measuring device of Based PC Type B Luo-coil |
| CN103023479A (en) * | 2012-12-14 | 2013-04-03 | 广西星宇智能电气有限公司 | Analog integrator circuit based on rogowski coil current transformer |
| CN104237727B (en) * | 2014-09-09 | 2017-01-11 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Transformer near-region short circuit signal monitoring device and short circuit recording analysis method |
| US9588147B2 (en) * | 2015-02-04 | 2017-03-07 | 3M Innovative Properties Company | Electronic integrator for Rogowski coil sensors |
| CN105675949B (en) * | 2016-01-06 | 2018-06-26 | 国网重庆市电力公司江北供电分公司 | The internal resistance of Rogowski coil electronic current mutual inductor changes the compensation method of Transfer characteristic |
| CN105738676A (en) * | 2016-04-11 | 2016-07-06 | 南京工程学院 | Protective Rogowski coil current transformer based on combined integral |
| CN105957703B (en) * | 2016-06-16 | 2017-09-22 | 许继集团有限公司 | The digital integration method and digital integrator of electronic mutual inductor |
| CN106546798A (en) * | 2016-11-23 | 2017-03-29 | 国家电网公司 | A kind of analogue integrator and electronic current transducer Acquisition Circuit |
| CN108414812B (en) * | 2018-02-06 | 2021-01-29 | 国网安徽省电力有限公司 | Electronic current transformer based on Rogowski coil and characteristic analysis method thereof |
| CN108490373B (en) * | 2018-02-07 | 2020-05-08 | 中北大学 | Full-automatic zero-setting electronic impact current meter and zero-setting method thereof |
| CN109856466A (en) * | 2019-01-28 | 2019-06-07 | 深圳供电局有限公司 | Measuring probe and its measurement method |
| CN112858765B (en) * | 2020-12-29 | 2022-07-19 | 广东电网有限责任公司电力科学研究院 | Capacitor bank busbar current measuring circuit based on Rogowski coil |
| CN113568335B (en) * | 2021-06-28 | 2024-01-30 | 国网天津市电力公司电力科学研究院 | Analog integration and self-calibration system and method for rogowski coil current transformer |
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