CN201946423U - Integrator circuit for electronic current transformer based on Rogowski coil - Google Patents
Integrator circuit for electronic current transformer based on Rogowski coil Download PDFInfo
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- CN201946423U CN201946423U CN2011200061153U CN201120006115U CN201946423U CN 201946423 U CN201946423 U CN 201946423U CN 2011200061153 U CN2011200061153 U CN 2011200061153U CN 201120006115 U CN201120006115 U CN 201120006115U CN 201946423 U CN201946423 U CN 201946423U
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Abstract
The utility model relates to an integrator circuit for an electronic current transformer based on a Rogowski coil. The integrator circuit structurally comprises the Rogowski coil, a low-frequency gain flattening analog integrator and a signal processing circuit, wherein the Rogowski coil is used for outputting transient signals to the low-frequency gain flattening analog integrator and outputting steady-state signals to the signal processing circuit; the low-frequency gain flattening analog integrator is used for processing the transient signals 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 the output signals of the low-frequency gain flattening analog integrator, conducting digital integration processing to the steady-state signals output by the Rogowski coil and transmitting the processed signals to a protection channel and a metering channel through an output interface circuit. The integrator circuit for the electronic current transformer based on the Rogowski coil has the advantages that not only can the high-accuracy measurement of the steady-state signals be realized, but also the rapid response of the transient signals can be realized, the measurement data of the protection channel and the metering channel can be simultaneously provided by using one Rogowski coil, and the temperature stability and the anti-vibration property are very good.
Description
Technical field
The utility model relates to a kind of integrator circuit, relates in particular to a kind of electronic current mutual inductor integrator circuit based on Luo-coil, belongs to the current measurement techniques field.
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 wherein key components 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. as 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, as 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 the characteristics that easily realize, is the comparison difficulty but will reach high accuracy and stability.Particularly the frequency when signal is lower, amplitude is less and time of integration 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 high accuracy in the long-time running and be difficult in the measurement to power current.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 is not subjected to 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 to the less demanding occasion of transient response characteristic.
For 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 measuring equipment 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 utility model adopt a kind of based on the low-frequency gain planarization analogue integrator and realize only adopting a Luo-coil can be simultaneously to provide the integrator circuit of transient state and steady-state signal for protection and measuring equipment 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 integrator circuit in order to solve the problems of the technologies described above the utility model 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 conversion speed, increases strong anti-interference ability and accuracy of measurement.
For reaching the electronic current mutual inductor integrator circuit of above-mentioned purpose the utility model based on Luo-coil, be made 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 sent to protection passage and measurement channel data by output interface circuit.
Described low-frequency gain planarization analogue integrator is made 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 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 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 transducer, digital integrator and interface circuit; The first analog and digital signal transducer is used for the output signal of low-frequency gain planarization analogue integrator is converted to 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 of the second analog and digital signal transducer, first high pass filter, second high pass filter and accumulator; The second analog and digital signal transducer links to each other with first high pass filter with Luo-coil respectively; Accumulator links to each other with second high pass filter with first high pass filter respectively; Second high pass filter links to each other with output interface circuit.
The utility model has the advantages of:
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, adopt in the utility model circuit based on the digital integrator of complexification Simpson formula and realize measurement, for measuring equipment provides signal to the stable state low-frequency current 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, accuracy of measurement height, the transient performance of the utility model circuit are 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 better than 5TPE, and time resolution characteristics are less than 0.1ms.
4, the utility model circuit has excellent temperature stability and anti-vibration characteristic, and in-40 ℃ ~+80 ℃ range of temperature, the measure error that the digitized measurement system causes because of variations in temperature is less than ± 0.05%; External vibration can not have any impact to the accuracy of measurement mechanism.
Of the present utility model can the realization measured the high 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 utility model.
Fig. 2 is the circuit diagram of the low-frequency gain planarization analogue integrator in the utility model.
Fig. 3 is the circuit diagram of the signal processing circuit in the utility model.
Fig. 4 is the circuit diagram based on the digital integrator of complexification Simpson formula in the utility model.
Among the figure: 1, Luo-coil; 2, low-frequency gain planarization analogue integrator; 3, signal processing circuit; 4, the first analog and digital signal transducer; 5, digital integrator; 6, interface circuit; 7, protection passage; 8, measurement channel; 9, the second analog and digital signal transducer; 10, first high pass filter; 11, accumulator; 12, second high 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
The utility model is described in further detail below in conjunction with accompanying drawing.
The utility model is based on the electronic current mutual inductor integrator circuit of Luo-coil as shown in Figure 1, be made 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 sent to protection passage 7 and measurement channel 8 data by output interface circuit 6.
Low-frequency gain planarization analogue integrator 2 is made of following structure as shown in Figure 2: 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 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 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.
Signal processing circuit 3 is made up of the first analog and digital signal transducer 4, digital integrator 5 and interface circuit 6 as shown in Figure 3; The first analog and digital signal transducer 4 is used for the output signal of low-frequency gain planarization analogue integrator 2 is converted to digital signal; Digital integrator 5 carries out digital integration with the output signal of Luo-coil 1; Interface circuit 6 is delivered to measurement channel 8 and protection passage 7 with the output of digital integrator 5 and the output of the first analog and digital signal transducer 4.
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 transducer 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 transducer 9 adopts, first high pass filter 10, second high pass filter 12 and accumulator 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 through after low-frequency gain planarization analogue integrator 2 and digital integrator 5 processing, offers protection and measuring equipment respectively by output interface circuit 6 respectively again, and is used for relay protection of power system and electric energy metrical.
Claims (4)
1. based on the electronic current mutual inductor integrator circuit of Luo-coil, it is characterized in that being made 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 sent to protection passage and measurement channel data by output interface circuit.
2. the electronic current mutual inductor integrator circuit based on Luo-coil according to claim 1, it is characterized in that described low-frequency gain planarization analogue integrator is made of following structure: operational amplifier, 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 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 of operational amplifier; Second electric capacity is connected between the tie point and ground of the 3rd resistance and the 4th resistance.
3. the electronic current mutual inductor integrator circuit based on Luo-coil according to claim 1 is characterized in that described signal processing circuit is made up of the first analog and digital signal transducer, digital integrator and interface circuit; The first analog and digital signal transducer is used for the output signal of low-frequency gain planarization analogue integrator is converted to 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.
4. the electronic current mutual inductor integrator circuit based on Luo-coil according to claim 3, it is characterized in that described digital integrator, constitute by the second analog and digital signal transducer, first high pass filter, second high pass filter and accumulator; The second analog and digital signal transducer links to each other with first high pass filter with Luo-coil respectively; Accumulator links to each other with second high pass filter with first high pass filter respectively; Second high pass filter links to each other with output interface circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200061153U CN201946423U (en) | 2011-01-11 | 2011-01-11 | Integrator circuit for electronic current transformer based on Rogowski coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200061153U CN201946423U (en) | 2011-01-11 | 2011-01-11 | Integrator circuit for electronic current transformer based on Rogowski coil |
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| CN201946423U true CN201946423U (en) | 2011-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011200061153U Expired - Lifetime CN201946423U (en) | 2011-01-11 | 2011-01-11 | Integrator circuit for electronic current transformer based on Rogowski coil |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128966A (en) * | 2011-01-11 | 2011-07-20 | 沈阳互感器有限责任公司 | Rogowski coil-based integrator circuit for electronic current transformer |
| CN102931938A (en) * | 2012-10-12 | 2013-02-13 | 中国兵器工业集团第二一四研究所苏州研发中心 | Charge gate converter circuit based on LTCC (Low Temperature Co-fired Ceramic) multilayer substrate technology |
| CN104764919A (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Electronic type voltage transformer based on lossy double integrating circuit |
| CN105675949A (en) * | 2016-01-06 | 2016-06-15 | 国网重庆市电力公司江北供电分公司 | Compensation method for internal resistance transfer characteristics of Rogowski coil electronic type current transformer |
| CN105738676A (en) * | 2016-04-11 | 2016-07-06 | 南京工程学院 | Protective Rogowski coil current transformer based on combined integral |
| CN106130534A (en) * | 2016-06-03 | 2016-11-16 | 中国科学院等离子体物理研究所 | Digital integrator for direct current long pulse current measurement |
-
2011
- 2011-01-11 CN CN2011200061153U patent/CN201946423U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128966A (en) * | 2011-01-11 | 2011-07-20 | 沈阳互感器有限责任公司 | Rogowski coil-based integrator circuit for electronic current transformer |
| CN102128966B (en) * | 2011-01-11 | 2012-07-11 | 沈阳互感器有限责任公司 | Rogowski coil-based integrator circuit for electronic current transformer |
| CN102931938A (en) * | 2012-10-12 | 2013-02-13 | 中国兵器工业集团第二一四研究所苏州研发中心 | Charge gate converter circuit based on LTCC (Low Temperature Co-fired Ceramic) multilayer substrate technology |
| CN102931938B (en) * | 2012-10-12 | 2015-11-25 | 中国兵器工业集团第二一四研究所苏州研发中心 | Based on the gate charge converter circuit of LTCC multilager base plate technique |
| CN104764919A (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Electronic type voltage transformer based on lossy double integrating circuit |
| CN104764919B (en) * | 2015-03-16 | 2017-12-22 | 中国计量学院 | Based on the electronic type voltage transformer for damaging double integrating circuit |
| CN105675949A (en) * | 2016-01-06 | 2016-06-15 | 国网重庆市电力公司江北供电分公司 | Compensation method for internal resistance transfer characteristics of Rogowski coil electronic type current transformer |
| 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 |
| CN106130534A (en) * | 2016-06-03 | 2016-11-16 | 中国科学院等离子体物理研究所 | Digital integrator for direct current long pulse current measurement |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110824 Effective date of abandoning: 20120711 |