CN201966889U - Integrator for optimizing frequency response characteristic of intruding wave recording device of transformer substation - Google Patents
Integrator for optimizing frequency response characteristic of intruding wave recording device of transformer substation Download PDFInfo
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- CN201966889U CN201966889U CN2010206674128U CN201020667412U CN201966889U CN 201966889 U CN201966889 U CN 201966889U CN 2010206674128 U CN2010206674128 U CN 2010206674128U CN 201020667412 U CN201020667412 U CN 201020667412U CN 201966889 U CN201966889 U CN 201966889U
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- 230000010354 integration Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000005457 optimization Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 description 3
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Abstract
The utility model discloses an integrator for optimizing the frequency response characteristic of an intruding wave recording device of a transformer substation, which comprises an integrating resistor, an operational amplifier and an amplitude comparing module, wherein the operational amplifier is a three-level operational amplifier formed by connecting three-level operational amplifying circuits in series; one end of the integrating resistor is connected with a Rogowski coil sensor in a Rogowski coil measurement system; the other end of the integrating resistor is connected in parallel with two branch circuits; one of the two branch circuits is directly connected with the amplitude comparing module; the other branch circuit is also connected with the amplitude comparing module after being connected in series with the three-level operational amplifier; the input signals of the two branch circuits are compared by the amplitude comparing module, and the signals after being operated are output. The integrator is capable of achieving the goal that a Rogowski coil has a wider response frequency; and on the premise of not influencing the Rogowski coil measurement accuracy, the operating frequency of the Rogowski coil sensor is broadened to the natural resonant frequency of the coil, and the operating frequency can be within a high-bandwidth measurement range from the power frequency to the high frequency.
Description
Technical field
The utility model relates to a kind of integrated circuit application apparatus, is meant that specifically a kind of transformer station invades ripple tape deck Frequency Response and optimizes integrator, and this integrator can make Luo-coil measurement mechanism amplitude-frequency characteristic significantly improve.
Background technology
The feature that traditional Luo-coil measurement mechanism is had according to sensing head output signal under the different terminals be divided into from integration type and outside integration type.From integration type Luo-coil terminal is the resistance that impedance is very little, and the integrating resistor pressure drop is far smaller than the pressure drop on the Luo-coil inductance, and output voltage and tested electric current are proportional, is applicable to measure the above high amplitude pulse high current of high-frequency of megahertz; Outer integration type Luo-coil terminal is the resistance that impedance is relatively large, pressure drop on the integrating resistor is far longer than the pressure drop on the Luo-coil inductance, output voltage becomes differential relationship with tested electric current, needs the additional credits circuit to reduce tested electric current, is applicable to measure the medium and low frequency pulse current.
Yet thunder and lightning intrusion ripple overvoltage and switching overvoltage are that spectral characteristic is very complicated in the transformer station, and the above HFS of wherein existing megahertz also has the medium and low frequency part, and therefore the response current on substation bus bar and each branch road also has been full of diversity.The response frequency of traditional Luo-coil can not satisfy the requirement of current monitoring, and other monitoring means often will change the electrical wiring in the transformer station, brings huge potential safety hazard to substation operation.
The utility model content
The purpose of this utility model provides a kind of transformer station and invades ripple tape deck Frequency Response optimization integrator, this integrator can realize that Luo-coil can have wideer response frequency, be applicable to that transformer station invades ripple electric current record, under the prerequisite that does not influence the Luo-coil certainty of measurement, make the working frequency range of Luo-coil transducer widen the natural resonance frequency of coil, working frequency range can be in the big bandwidth measurement scope from the power frequency to the high frequency.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of transformer station invades ripple tape deck Frequency Response and optimizes integrator, it is characterized in that: this integrator comprises integrating resistor, operational amplifier and amplitude comparison module, described operational amplifier is three grades of three-stage operational amplifiers that the discharge circuit series connection is constituted, one end of described integrating resistor is connected with Luo-coil transducer in the Luo-coil measuring system, the other end is parallel with two branch roads, a branch road wherein directly is connected with described amplitude comparison module, also be connected after another branch road and the series connection of described three-stage operational amplifier with described amplitude comparison module, described amplitude comparison module is the input signal of two branch roads relatively, and the signal after the output computing.
Described three-stage operational amplifier comprises one-level operational amplifier, two-level operating amplifier and the three-stage operational amplifier that is in series, wherein series capacitance C1 is 330 microfarads between one-level operational amplifier and two-level operating amplifier, be used for suppressing the gain of very low frequency interference signal, series capacitance C3 is 470 microfarads between three-stage operational amplifier and described amplitude comparison module, be used for isolated DC, limit the null offset of active integration, resistance R 6 in the described one-level operational amplifier is 33 ohm, and operating voltage is 15V; Reverse input end series resistance R is 1 ohm in the described two-level operating amplifier, and input series resistance R2 is 1 ohm in the same way, and resistance R _ f is 6.8 megaohms in the feedback loop, and capacitor C is 0.47 microfarad; Reverse input end series resistance R4 is 10 ohm in the described three-stage operational amplifier, and input series resistance R3 is 1 ohm in the same way, and R5 is 10 ohm in the feedback loop, and capacitor C 2 is 0.47 microfarad.
Integrator of the present utility model inserts the integrating resistor that resistance is certain resistance in the Luo-coil transducer tip, integrating resistor two branch roads in parallel.Article one, branch road is the three-stage operational amplifier series connection, first order operational amplifier plays voltage and follows effect, make the input terminal voltage of operational amplifier at the corresponding levels not influenced by parameter of output end, the second level and third level operational amplifier play integral action, when Luo-coil is measured the medium and low frequency signal, signal by electromagnetic coupled can reduce measuring-signal through the integration of operational amplifier, and the output of third level operational amplifier is connected with the input of amplitude comparison module; The second branch road directly is connected with the input of amplitude comparison module.When measuring-signal frequency during up to megahertz, article one, the branch road frequency response is poor, the distortion of integration recovering signal is serious, signal amplitude integral body diminishes, wave distortion, and the second branch road can accurately reflect primary signal, and signal amplitude is the signal of second branch road much larger than the signal of article one branch road through output signal behind the amplitude comparison module; When measuring-signal is in the medium and low frequency section, article one, branch road has frequency response preferably, the signal of integration reduction is undistorted, meanwhile, the second branch road is because the big input/output signal of inductance dividing potential drop is not proportional, the output signal amplitude significantly diminishes, and distortion is serious, through being output as the signal of article one branch road behind the amplitude comparison module at last.
Compared with prior art, the beneficial effects of the utility model are: Luo-coil is under the prerequisite that guarantees original certainty of measurement, operating frequency can be widened greatly, can be operated in power frequency to the above frequency range of megahertz, the integrating circuit that is adopted is simple in structure, with low cost, the phase mutual interference is little between circuit.
Description of drawings
Fig. 1 is the circuit diagram of the utility model integrator;
Fig. 2 is the oscillogram of the utility model integrator input test waveform and output test waveform.
Embodiment
A kind of transformer station as shown in Figure 1 invades ripple tape deck Frequency Response and optimizes integrator, this integrator comprises integrating resistor r, operational amplifier and amplitude comparison module, operational amplifier is three grades of three-stage operational amplifiers that the discharge circuit series connection is constituted, the selection of integrating resistor r size need be in conjunction with the number of turn of Luo-coil and the scope of current measurement, when 110kV measures CVT loop response electric current in the transformer station of 500kV electric pressure, the Standard resistance range of the integrating resistor r that needs is at 4 to 10 ohm, one end of integrating resistor is connected with Luo-coil transducer in the Luo-coil measuring system, the other end is parallel with two branch roads, a branch road wherein directly is connected with the amplitude comparison module, also be connected after the series connection of another branch road and three-stage operational amplifier with the amplitude comparison module, the amplitude comparison module is the input signal of two branch roads relatively, and the signal after the output computing.
Three-stage operational amplifier comprises one-level operational amplifier, two-level operating amplifier and the three-stage operational amplifier that is in series, wherein series capacitance C1 is 330 microfarads between one-level operational amplifier and two-level operating amplifier, be used for suppressing the gain of very low frequency interference signal, series capacitance C3 is 470 microfarads between three-stage operational amplifier and amplitude comparison module, be used for isolated DC, limit the null offset of active integration.First order operational amplifier plays voltage and follows effect, make the input terminal voltage of operational amplifier at the corresponding levels not influenced by parameter of output end, the second level and third level operational amplifier play integral action, when Luo-coil was measured the medium and low frequency signal, the signal by electromagnetic coupled can reduce measuring-signal through the integration of operational amplifier.
It is the high-speed low-power-consumption operational amplifier of AD817 that the one-level operational amplifier is selected the model of Analog Device company for use, and the resistance R 6 in the one-level operational amplifier is 33 ohm, and operating voltage is 15V; It is the amplifier of AD308 that two-level operating amplifier is selected the model of AnalogDevice company for use, reverse input end series resistance R is 1 ohm in the two-level operating amplifier, input series resistance R2 is 1 ohm in the same way, resistance R _ f is 6.8 megaohms in the feedback loop, capacitor C is 0.47 microfarad, the two-level operating amplifier stable operating point, the active integration of realization signal is used for suppressing the gain of very low frequency interference signal in the capacitor C 1 of amplifier front end series connection at the corresponding levels; It is the amplifier of AD308 that three-stage operational amplifier is selected the model of Analog Device company for use, reverse input end series resistance R4 is 10 ohm in the three-stage operational amplifier, input series resistance R3 is 1 ohm in the same way, R5 is 10 ohm in the feedback loop, capacitor C 2 is 0.47 microfarad, the discharge circuit of three-stage operational amplifier is realized the signal adjustment, and the polarity of signal can not changed because of integrating circuit.
This integrator makes Luo-coil under the prerequisite that guarantees original certainty of measurement, and operating frequency can be widened greatly, can be operated in power frequency to the above frequency range of megahertz.
Input current pulse signal as shown in Figure 2 and output measuring-signal, the Luo-coil that adopts in test is 1500 circles, integrating resistor is 7 ohm, can see that it is very high that process is improved the current monitoring precision of transformer station's intrusion ripple tape deck of integrator, in 1.3%, the low frequency part error is in 2.9% in the HFS error.
Claims (2)
1. a transformer station invades ripple tape deck Frequency Response optimization integrator, it is characterized in that: this integrator comprises integrating resistor, operational amplifier and amplitude comparison module, described operational amplifier is three grades of three-stage operational amplifiers that the discharge circuit series connection is constituted, one end of described integrating resistor is connected with Luo-coil transducer in the Luo-coil measuring system, the other end is parallel with two branch roads, a branch road wherein directly is connected with described amplitude comparison module, also be connected after another branch road and the series connection of described three-stage operational amplifier with described amplitude comparison module, described amplitude comparison module is the input signal of two branch roads relatively, and the signal after the output computing.
2. integrator according to claim 1, it is characterized in that: described three-stage operational amplifier comprises the one-level operational amplifier that is in series, two-level operating amplifier and three-stage operational amplifier, wherein series capacitance C1 is 330 microfarads between one-level operational amplifier and two-level operating amplifier, be used for suppressing the gain of very low frequency interference signal, series capacitance C3 is 470 microfarads between three-stage operational amplifier and described amplitude comparison module, be used for isolated DC, limit the null offset of active integration, resistance R 6 in the described one-level operational amplifier is 33 ohm, and operating voltage is 15V; Reverse input end series resistance R is 1 ohm in the described two-level operating amplifier, and input series resistance R2 is 1 ohm in the same way, and resistance R _ f is 6.8 megaohms in the feedback loop, and capacitor C is 0.47 microfarad; Reverse input end series resistance R4 is 10 ohm in the described three-stage operational amplifier, and input series resistance R3 is 1 ohm in the same way, and R5 is 10 ohm in the feedback loop, and capacitor C 2 is 0.47 microfarad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206674128U CN201966889U (en) | 2010-12-20 | 2010-12-20 | Integrator for optimizing frequency response characteristic of intruding wave recording device of transformer substation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010206674128U CN201966889U (en) | 2010-12-20 | 2010-12-20 | Integrator for optimizing frequency response characteristic of intruding wave recording device of transformer substation |
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| CN201966889U true CN201966889U (en) | 2011-09-07 |
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| CN2010206674128U Expired - Lifetime CN201966889U (en) | 2010-12-20 | 2010-12-20 | Integrator for optimizing frequency response characteristic of intruding wave recording device of transformer substation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102707320A (en) * | 2012-06-27 | 2012-10-03 | 湖南继善高科技有限公司 | Method and device for automatically removing electromagnetic coupling in induced polarization measurement |
| CN104094125A (en) * | 2012-02-03 | 2014-10-08 | 电力电子测量有限公司 | Temperature compensated current measurement |
| CN106788439A (en) * | 2016-11-30 | 2017-05-31 | 上海集成电路研发中心有限公司 | The regulating system and method for integral form digital analog converter transfer characteristic |
| CN107436616A (en) * | 2017-08-04 | 2017-12-05 | 昆山帝森克罗德光电技术有限公司 | A kind of Rogowski coil integrating circuit for power factor controller product |
| CN107765085A (en) * | 2017-11-15 | 2018-03-06 | 西北师范大学 | A kind of signal supervisory instrument and method |
| CN108845231A (en) * | 2018-06-29 | 2018-11-20 | 山东信通电子股份有限公司 | Based on visual route tower body current detecting system |
| CN112122999A (en) * | 2020-09-21 | 2020-12-25 | 珠海格力电器股份有限公司 | Motor protection system and method |
-
2010
- 2010-12-20 CN CN2010206674128U patent/CN201966889U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104094125A (en) * | 2012-02-03 | 2014-10-08 | 电力电子测量有限公司 | Temperature compensated current measurement |
| CN102707320A (en) * | 2012-06-27 | 2012-10-03 | 湖南继善高科技有限公司 | Method and device for automatically removing electromagnetic coupling in induced polarization measurement |
| CN106788439A (en) * | 2016-11-30 | 2017-05-31 | 上海集成电路研发中心有限公司 | The regulating system and method for integral form digital analog converter transfer characteristic |
| CN106788439B (en) * | 2016-11-30 | 2021-06-15 | 上海集成电路研发中心有限公司 | System and method for adjusting transfer characteristics of integral analog-to-digital converter |
| CN107436616A (en) * | 2017-08-04 | 2017-12-05 | 昆山帝森克罗德光电技术有限公司 | A kind of Rogowski coil integrating circuit for power factor controller product |
| CN107765085A (en) * | 2017-11-15 | 2018-03-06 | 西北师范大学 | A kind of signal supervisory instrument and method |
| CN108845231A (en) * | 2018-06-29 | 2018-11-20 | 山东信通电子股份有限公司 | Based on visual route tower body current detecting system |
| CN112122999A (en) * | 2020-09-21 | 2020-12-25 | 珠海格力电器股份有限公司 | Motor protection system and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yao Senjing Inventor after: Peng Xiangyang Inventor after: Wang Hongbin Inventor after: Lv Hong Inventor before: Yao Senjing Inventor before: Peng Xiangyang Inventor before: Wang Hongbin Inventor before: Lv Hong Inventor before: Qian Guanjun Inventor before: Zhang Guoqing |
|
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee after: ELECTRIC POWER RESEARCH INSTITUTE, GUANGDONG POWER GRID CO., LTD. Address before: 510080 dongdongdong Road, dongdongdong Road, Guangzhou, Guangdong Province, No. 8 Patentee before: Electrical Power Research Institute of Guangdong Power Grid Corporation |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110907 |