CN112379323A - Equivalent simulation generator based on Rogowski coil characteristics and electronic equipment - Google Patents
Equivalent simulation generator based on Rogowski coil characteristics and electronic equipment Download PDFInfo
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- CN112379323A CN112379323A CN202011224119.9A CN202011224119A CN112379323A CN 112379323 A CN112379323 A CN 112379323A CN 202011224119 A CN202011224119 A CN 202011224119A CN 112379323 A CN112379323 A CN 112379323A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
Abstract
The invention belongs to the technical field of power equipment, and particularly relates to an equivalent simulation generator based on Rogowski coil characteristics and electronic equipment. The equivalent simulation generator based on the Rogowski coil characteristic comprises a matching circuit, a signal following circuit, a Rogowski coil equivalent differential characteristic circuit and an amplification balancing circuit which are sequentially connected in series; the matching circuit is used for providing a stable input signal; the amplifying and balancing circuit is used for amplifying the output signal and converting the single-end unbalanced signal into a double-end balanced signal for output. The method can better measure a later-stage integrating circuit, simulate the equivalent differential characteristic of the Rogowski coil and measure the linear distortion degree of the whole wave recording circuit.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to an equivalent simulation generator based on Rogowski coil characteristics and electronic equipment.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In a modern power system fault test, a rogowski coil is often adopted for current collection, but generally fault location requires that the measurement frequency range of the rogowski coil is wide, an output signal can be extracted by a post-stage circuit, and sometimes the primary side traveling wave current of the rogowski coil is required to be thousands of amperes.
The inventor finds that general signal generating equipment in the market has small amplitude or poor square wave characteristics and is difficult to meet the requirements of a later-stage integrating circuit; analog generators with high frequency and large current are few in the market and expensive in price, and a fault location acquisition integrating circuit of the Rogowski coil needs to test the linear distortion characteristic of the Rogowski coil.
Disclosure of Invention
In order to solve at least one technical problem in the background art, a first aspect of the present invention provides an equivalent analog generator based on the characteristics of a rogowski coil, which can better measure the later-stage integral circuit, simulate the equivalent differential characteristics of the rogowski coil, and measure the linear distortion degree of the whole wave recording circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
an equivalent simulation generator based on Rogowski coil characteristics comprises a matching circuit, a signal following circuit, a Rogowski coil equivalent differential characteristic circuit and an amplification balancing circuit which are sequentially connected in series; the matching circuit is used for providing a stable input signal; the amplifying and balancing circuit is used for amplifying the output signal and converting the single-end unbalanced signal into a double-end balanced signal for output.
In one embodiment, the matching circuit includes a coaxial cable and a first resistor, the signal input terminal is connected to the coaxial cable, the coaxial cable is connected to one end of the first resistor, and the other end of the first resistor is connected to the signal ground.
The technical scheme has the advantages that the matching circuit formed by the coaxial cable and the first resistor is utilized to match the impedance of the signal loop, reduce the interference of reflected waves, reduce the interference of signal noise and improve the quality of transmission signals.
In one embodiment, the signal follower circuit includes a first amplifier and a second resistor, a non-inverting input terminal of the first amplifier is connected to an output terminal of the matching circuit, an inverting input terminal of the first amplifier is connected to one end of the first amplifier, and an output terminal of the first amplifier is connected to the other end of the second resistor.
The technical scheme has the advantages that the signal following circuit is added between the matching circuit and the Rogowski coil equivalent differential characteristic circuit, so that the interference of reflected waves is reduced, the interference of signal noise is reduced, and the quality of transmission signals is improved.
In one embodiment, the rogowski coil equivalent differential characteristic circuit includes an inductor and a third resistor, one end of the third resistor is connected to the output end of the signal follower circuit, the other end of the third resistor is the output end and is connected to one end of the inductor, and the other end of the inductor is connected to the signal ground.
The advantage of above-mentioned scheme lies in, replaces the heaviness of traditional rogowski coil through inductance and third resistance, has replaced the characteristic demand that the primary side of rogowski coil needs heavy current, has reduced in the rogowski coil test because the unstable influence of the signal intensity that the position is unsettled, has promoted the linearity and the continuity of signal in the circuit.
In one embodiment, the amplifier balancing circuit is a single-ended input double-ended output circuit.
In one embodiment, the amplification balance circuit includes a first amplification circuit and a second amplification circuit having the same configuration.
The scheme has the advantages that the signal in the signal amplifying circuit is amplified and balanced, common-mode signals of the signal source are eliminated, and stability and reliability of signal transmission quality are improved.
In one embodiment, the positive input terminal of the first amplifier circuit is connected to the output terminal of the rogowski coil equivalent differential characteristic circuit, the negative input terminal of the first amplifier circuit is connected to the negative input terminal of the second amplifier circuit, and the positive input terminal of the second amplifier circuit is connected to the signal ground.
In one embodiment, the first amplifying circuit and the second amplifying circuit are each composed of an amplifier, an input resistor, a follower resistor, and an output resistor.
In one embodiment, the output resistors of the first amplifying circuit and the second amplifying circuit are connected in series with an output capacitor.
In order to solve at least one technical problem in the background art, a second aspect of the present invention provides an electronic device including the equivalent analog generator based on the rogowski coil characteristic.
The invention has the beneficial effects that:
(1) the resistor and the inductor replace the bulkiness of the traditional Rogowski coil, the characteristic requirement that the primary side of the Rogowski coil needs large current is replaced, the unstable influence of the strength of signals with unfixed positions in the Rogowski coil test is reduced, and the linearity and the continuity of the signals in the circuit are improved.
(2) According to the invention, the signal in the signal amplification circuit is amplified and balanced through the two operational amplifiers in the signal unbalance circuit-to-balance circuit, so that a common-mode signal of a signal source is eliminated, and the stability and reliability of the signal transmission quality are improved.
(3) The operational amplifier follower circuit is added between the output end of the signal coaxial cable and the input end of the signal balance circuit, so that the impedance of a signal loop is matched, the interference of reflected waves is reduced, the interference of signal noise is reduced, and the quality of transmission signals is improved.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of an equivalent analog generator based on rogowski coil characteristics according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
Fig. 1 shows a schematic diagram of an analog generator replacing a rogowski coil in this embodiment, and the circuit structure of the equivalent analog generator based on the rogowski coil characteristic in this embodiment specifically includes a matching circuit, a signal follower, a rogowski coil equivalent differential characteristic circuit and an amplification balancing circuit.
In this implementation, a matching circuit is provided at the signal input for providing a stable input signal to the circuit, including a coaxial cable W1 and a first resistor R1. The signal input end coaxial cable W1 is connected with one end of a first resistor R1, and the other end of the first resistor R1 is connected with a signal ground.
In the embodiment, the first resistor R1 and the follower circuit are added between the signal input circuit and the ground, and the impedance matching processing of the circuit can reduce the attenuation interference of noise signals in the signal amplification circuit and improve the quality of transmission signals.
It is understood herein that in other embodiments, the matching circuit may be implemented using other existing matching circuits.
In this embodiment, the signal follower circuit includes a first amplifier a1 and a second resistor R2, a non-inverting input terminal of the first amplifier a1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the signal in a backflow manner, an inverting input terminal of the first amplifier a1 is connected to one end of the second resistor R2, and an output terminal of the first amplifier a1 is connected to the other end of the second resistor R2.
Preferably, the first amplifier a1 is model LMH6612 MA.
In the embodiment, the signal following circuit is added between the matching circuit and the rogowski coil equivalent differential characteristic circuit, so that the interference of reflected waves is reduced, the interference of signal noise is reduced, and the quality of transmission signals is improved.
In this embodiment, a rogowski coil equivalent differential characteristic circuit is formed by a third resistor R3 and an inductor L1, wherein one end of the third resistor R3 is connected to the input end of the amplification balancing circuit, and the other end of the third resistor R3 is connected to the inductor L1.
In the embodiment, the inductor and the third resistor R3 replace the bulkiness of the traditional Rogowski coil, the characteristic requirement that the primary side of the Rogowski coil needs large current is replaced, the unstable influence of the strength of a signal with an unfixed position in the Rogowski coil test is reduced, and the linearity and the continuity of the signal in the circuit are improved.
In this embodiment, the amplifying and balancing circuit is used for amplifying the output signal and converting the single-end unbalanced signal into a double-end balanced signal for output. The amplification balancing circuit is composed of a first amplification circuit and a second amplification circuit which are identical in structure. The positive phase input end of the first amplifying circuit is connected with the output end of the rogowski coil equivalent differential characteristic circuit, the negative phase input end of the first amplifying circuit is connected with the negative phase input end of the second amplifying circuit, and the positive phase input end of the second amplifying circuit is connected with a signal ground. The first amplifying circuit and the second amplifying circuit are respectively composed of an amplifier, an input resistor, a following resistor and an output resistor.
In specific implementation, the output resistors of the first amplifying circuit and the second amplifying circuit are connected in series with an output capacitor.
Specifically, as shown in fig. 1, the amplification balancing circuit includes an amplifier a2, an amplifier A3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a capacitor C1, a capacitor C2, and a connection terminal J2, wherein a same-direction input terminal of the signal amplifier a2 is connected to the resistor R2, an opposite-direction input terminal of the signal amplifier a2 is connected to one end of the resistor R2, an output terminal of the signal amplifier a2 is connected to the other end of the resistor R2, an opposite-direction input terminal of the signal amplifier a2 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to ground, an opposite-direction input terminal of the signal amplifier a2 is connected to one end of the resistor R2, resistance R9 one end is connected with amplifier A2's output, the resistance R9 other end is connected with electric capacity C1 one end, resistance R10 one end is connected with amplifier A3's output, the resistance R10 other end is connected with electric capacity C2 one end, the electric capacity C1 other end is connected with differential binding post J2 one end, the electric capacity C2 other end is connected with differential binding post J2 one end.
Preferably, amplifier a2 and amplifier A3 are both LMH6612MA models.
In the embodiment, the in-phase proportional amplification of the input signal of the amplifying circuit is realized through the amplifier a1, the amplifier a2, the resistor R1, the resistor R2, the resistor R3, the capacitor C1 and the capacitor C2 in the signal amplifying circuit, so that the strength of the signal in the circuit is improved, and the linearity of the signal in the circuit and the continuity of signal transmission are improved.
The embodiment solves the problems that the general signal generating equipment in the market has small amplitude or poor square wave characteristics and is difficult to meet the requirements of a post-stage integrating circuit; the analog generator with high frequency and large current is less on the market and expensive in price, the fault location problem that the Rogowski coil acquisition and integration circuit needs to test the linear distortion characteristic of the Rogowski coil acquisition and integration circuit is solved, the voltage signal output by the signal generator is converted into the current signal, and the characteristic curve of the Rogowski coil is simulated so as to be used by the subsequent stage integration and amplification circuit.
The embodiment also provides an electronic device, which comprises the equivalent analog generator based on the rogowski coil characteristics. Other structures of the electronic device are all realized by adopting the existing circuit structure, and the description is not repeated here.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An equivalent simulation generator based on Rogowski coil characteristics is characterized by comprising a matching circuit, a signal following circuit, a Rogowski coil equivalent differential characteristic circuit and an amplification balancing circuit which are sequentially connected in series; the matching circuit is used for providing a stable input signal; the amplifying and balancing circuit is used for amplifying the output signal and converting the single-end unbalanced signal into a double-end balanced signal for output.
2. The equivalent analog generator based on rogowski coil characteristics of claim 1, wherein the matching circuit comprises a coaxial cable and a first resistor, the signal input terminal is connected to the coaxial cable, the coaxial cable is connected to one end of the first resistor, and the other end of the first resistor is connected to a signal ground.
3. The equivalent analog generator based on rogowski coil characteristics according to claim 1, wherein the signal follower circuit comprises a first amplifier and a second resistor, a non-inverting input terminal of the first amplifier is connected to an output terminal of the matching circuit, an inverting input terminal of the first amplifier is connected to one terminal of the first amplifier, and an output terminal of the first amplifier is connected to the other terminal of the second resistor.
4. The equivalent analog generator based on rogowski coil characteristics as claimed in claim 1, wherein the rogowski coil equivalent differential characteristic circuit comprises an inductor and a third resistor, one end of the third resistor is connected with the output terminal of the signal follower circuit, the other end of the third resistor is the output terminal and is connected with one end of the inductor, and the other end of the inductor is connected with the signal ground.
5. The equivalent analog generator based on rogowski coil characteristics of claim 1, wherein the amplification balance circuit is a single-ended input double-ended output circuit.
6. The equivalent analog generator based on rogowski coil characteristics according to claim 1, wherein the amplification balance circuit is composed of two first amplification circuits and a second amplification circuit having the same structure.
7. The rogowski coil characteristic-based equivalent analog generator according to claim 6, wherein a non-inverting input terminal of the first amplifying circuit is connected to an output terminal of the rogowski coil equivalent differential characteristic circuit, an inverting input terminal of the first amplifying circuit is connected to an inverting input terminal of the second amplifying circuit, and a non-inverting input terminal of the second amplifying circuit is connected to a signal ground.
8. The rogowski coil characteristic-based equivalent analog generator according to claim 6, wherein the first amplifying circuit and the second amplifying circuit are each composed of an amplifier, an input resistor, a follower resistor, and an output resistor.
9. The equivalent analog generator based on rogowski coil characteristics of claim 8, wherein the output resistors of the first and second amplifying circuits are connected in series with an output capacitor.
10. An electronic device comprising an equivalent analog generator based on rogowski coil characteristics as claimed in any of claims 1-9.
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| CN202011224119.9A CN112379323B (en) | 2020-11-05 | 2020-11-05 | Equivalent simulation generator based on Rogowski coil characteristics and electronic equipment |
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| CN202011224119.9A CN112379323B (en) | 2020-11-05 | 2020-11-05 | Equivalent simulation generator based on Rogowski coil characteristics and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114598303A (en) * | 2022-03-17 | 2022-06-07 | 中国工程物理研究院流体物理研究所 | Pulse high-voltage or large-current detector and passive differential circuit and working method thereof |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1272921A (en) * | 1998-12-15 | 2000-11-08 | Tdk株式会社 | Magnetic sensor device and current sensor device |
| JP2002071772A (en) * | 2000-09-04 | 2002-03-12 | Tdk Corp | Sensor device |
| EP1273922A1 (en) * | 2001-07-06 | 2003-01-08 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Methods and devices for measuring electrical currents |
| CN1619316A (en) * | 2003-11-14 | 2005-05-25 | 佳能株式会社 | Current detection circuit and current detection method |
| CN102577061A (en) * | 2010-02-25 | 2012-07-11 | 富士电机株式会社 | Electric current estimation circuit |
| 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 |
| CN203590195U (en) * | 2013-12-10 | 2014-05-07 | 中国石油化工股份有限公司 | Improved simulation integrating circuit based on PCB Rogowski coil current transformer |
| US20150015244A1 (en) * | 2012-02-03 | 2015-01-15 | Power Electronic Measurements Limited | Temperature compensated current measurement |
| CN205562653U (en) * | 2016-02-18 | 2016-09-07 | 四川中光防雷科技股份有限公司 | Current inducer |
| CN105957703A (en) * | 2016-06-16 | 2016-09-21 | 许继集团有限公司 | Digital integration method for electronic transformer and digital integrator |
| CN207036946U (en) * | 2017-06-07 | 2018-02-23 | 湖南人文科技学院 | A kind of current measuring device |
| CN108414812A (en) * | 2018-02-06 | 2018-08-17 | 国网安徽省电力有限公司 | A kind of electronic current mutual inductor and its characteristic analysis method based on Rogowski coil |
-
2020
- 2020-11-05 CN CN202011224119.9A patent/CN112379323B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1272921A (en) * | 1998-12-15 | 2000-11-08 | Tdk株式会社 | Magnetic sensor device and current sensor device |
| JP2002071772A (en) * | 2000-09-04 | 2002-03-12 | Tdk Corp | Sensor device |
| EP1273922A1 (en) * | 2001-07-06 | 2003-01-08 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | Methods and devices for measuring electrical currents |
| CN1619316A (en) * | 2003-11-14 | 2005-05-25 | 佳能株式会社 | Current detection circuit and current detection method |
| CN102577061A (en) * | 2010-02-25 | 2012-07-11 | 富士电机株式会社 | Electric current estimation circuit |
| US20150015244A1 (en) * | 2012-02-03 | 2015-01-15 | Power Electronic Measurements Limited | Temperature compensated current measurement |
| 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 |
| CN203590195U (en) * | 2013-12-10 | 2014-05-07 | 中国石油化工股份有限公司 | Improved simulation integrating circuit based on PCB Rogowski coil current transformer |
| CN205562653U (en) * | 2016-02-18 | 2016-09-07 | 四川中光防雷科技股份有限公司 | Current inducer |
| CN105957703A (en) * | 2016-06-16 | 2016-09-21 | 许继集团有限公司 | Digital integration method for electronic transformer and digital integrator |
| CN207036946U (en) * | 2017-06-07 | 2018-02-23 | 湖南人文科技学院 | A kind of current measuring device |
| CN108414812A (en) * | 2018-02-06 | 2018-08-17 | 国网安徽省电力有限公司 | A kind of electronic current mutual inductor and its characteristic analysis method based on Rogowski coil |
Non-Patent Citations (3)
| Title |
|---|
| 刘艳峰等: "Rogowski线圈典型外积分电路暂态性能比较与仿真", 《电力自动化设备》 * |
| 李昂等: "基于PCB罗氏线圈的暂态电流采集装置", 《电气自动化》 * |
| 王鸿杰等: "采用罗柯夫斯基线圈和ARM+CPLD总线复用系统的输电线路故障暂态电流采集方法", 《电力系统保护与控制》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114598303A (en) * | 2022-03-17 | 2022-06-07 | 中国工程物理研究院流体物理研究所 | Pulse high-voltage or large-current detector and passive differential circuit and working method thereof |
| CN114598303B (en) * | 2022-03-17 | 2023-07-21 | 中国工程物理研究院流体物理研究所 | Pulse high-voltage or high-current detector, passive differential circuit thereof and working method thereof |
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