CN108562776B - Power frequency rogowski coil with multi-range output - Google Patents
Power frequency rogowski coil with multi-range output Download PDFInfo
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- CN108562776B CN108562776B CN201810603498.9A CN201810603498A CN108562776B CN 108562776 B CN108562776 B CN 108562776B CN 201810603498 A CN201810603498 A CN 201810603498A CN 108562776 B CN108562776 B CN 108562776B
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- 239000003990 capacitor Substances 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a power frequency rogowski coil with multi-range output, which is used for measuring a large current range and a small current range, and comprises a rogowski coil, an integrating circuit, an amplifying circuit and a low-pass filter circuit; the positive phase input end and the negative phase input end of the integrating circuit are respectively connected with the first output end and the second output end of the Rogowski coil; the amplifying circuit comprises a wide-range amplifying circuit and a small-range amplifying circuit; the positive input end of the wide-range amplifying circuit is connected with the output end of the integrating circuit, and the positive input end of the small-range amplifying circuit is connected with the output end of the integrating circuit; the low-pass filter circuit is respectively connected with the output ends of the wide-range amplifying circuit and the small-range amplifying circuit. The beneficial effects are that: when measuring power frequency current, the power frequency rogowski coil is provided with a large-range output end and a small-range output end, so that the large-current testing range is met, the small-current measuring precision requirement is met, the construction difficulty on the site is further reduced, and the current measuring precision is improved.
Description
Technical Field
The invention relates to the technical field of rogowski coils, in particular to a power frequency rogowski coil with multi-range output.
Background
The rogowski coil, also called a current measuring coil, a differential current sensor, is a toroidal coil uniformly wound on a non-ferromagnetic material. The output signal is the differential of the current with respect to time, and the input current is actually restored by a circuit that integrates the output voltage signal.
At present, the rogowski coil is widely applied to current measurement, but because the current range of a measured object is large, when the rogowski coil with a single measuring range is used for measurement, the measurement range and the measurement precision are difficult to be compatible. The large-range rogowski coil cannot guarantee the precision requirement under low current, and the small-range rogowski coil cannot meet the measurement range of high current, so that the construction difficulty on the site is increased.
Disclosure of Invention
Aiming at the problems in the prior art, a power frequency rogowski coil with multi-range output is provided.
The specific technical scheme is as follows:
the power frequency Rogowski coil with the multi-range output is used for measuring a large current range and a small current range, and comprises a Rogowski coil, an integrating circuit, an amplifying circuit and a low-pass filter circuit;
The positive phase input end and the negative phase input end of the integrating circuit are respectively connected with the first output end and the second output end of the rogowski coil, and the integrating circuit is used for integrating and converting a current signal measured by the rogowski coil into a voltage signal;
the amplifying circuit comprises a wide-range amplifying circuit and a small-range amplifying circuit;
The positive input end of the wide-range amplifying circuit is connected with the output end of the integrating circuit, and the wide-range amplifying circuit is used for amplifying the voltage signal with a wide range;
The positive input end of the small-range amplifying circuit is connected with the output end of the integrating circuit, and the small-range amplifying circuit is used for amplifying the voltage signal with a small range;
the low-pass filter circuit is respectively connected to the output ends of the wide-range amplifying circuit and the small-range amplifying circuit, and the low-pass filter circuit respectively carries out low-pass filtering on the output signals of the wide-range amplifying circuit and the small-range amplifying circuit and respectively outputs the signals through the wide-range output end and the small-range output end.
Preferably, the integrating circuit includes:
The non-inverting input end of the first operational amplifier is connected with the first output end, and the inverting input end of the first operational amplifier is connected with the second output end through a first resistor;
the second resistor is connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier;
The first capacitor is connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier;
The ground terminal is connected to the non-inverting input terminal of the first operational amplifier.
Preferably, the wide-range amplifying circuit includes:
The phase input end of the second operational amplifier is connected with the output end of the first operational amplifier through a second capacitor, and the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier through a third resistor;
The fourth resistor is connected between the inverting input end of the second operational amplifier and the grounding end;
And a fifth resistor connected between the non-inverting input end of the second operational amplifier and the grounding end.
Preferably, the small-range amplifying circuit includes:
The positive input end of the third operational amplifier is connected with the output end of the first operational amplifier through a third capacitor, and the negative input end of the third operational amplifier is connected with the output end of the third operational amplifier through a sixth resistor;
a seventh resistor connected between the inverting input terminal of the third operational amplifier and the ground terminal;
and the eighth resistor is connected between the non-inverting input end of the third operational amplifier and the grounding end.
Preferably, the low-pass filter circuit includes:
The non-inverting input end of the fourth operational amplifier is connected with the grounding end through a fourth capacitor, and the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier;
a fifth capacitor connected between the non-inverting input terminal of the fourth operational amplifier and the output terminal of the fourth operational amplifier through a ninth resistor;
And the tenth resistor is connected between the output end of the wide-range amplifying circuit and/or the small-range amplifying circuit and the ninth resistor.
Preferably, the first operational amplifier, the second operational amplifier and the third operational amplifier each include a positive power supply terminal and a negative power supply terminal;
The voltage of the positive power supply end is +5V, and the voltage of the negative power supply end is-5V.
Preferably, the fourth operational amplifier includes a positive power supply terminal and a negative power supply terminal;
The voltage of the positive power supply end is +5V, and the voltage of the negative power supply end is-5V.
The technical scheme of the invention has the beneficial effects that: when measuring power frequency current, the power frequency rogowski coil has two measuring range outputs: the large-range and small-range can meet the testing range of large current and the measurement precision requirement of small current, thereby reducing the construction difficulty on site and improving the measurement precision of current.
Drawings
Embodiments of the present invention will now be described more fully with reference to the accompanying drawings. The drawings, however, are for illustration and description only and are not intended as a definition of the limits of the invention.
FIG. 1 is a diagram of the overall circuit connection for a power frequency Rogowski coil in accordance with the present invention;
FIG. 2 is a circuit diagram of an integrating circuit according to the present invention;
FIG. 3 is a circuit diagram of a wide-range amplifying circuit according to the present invention;
FIG. 4 is a circuit diagram of a small-scale amplifying circuit according to the present invention;
fig. 5 is a circuit diagram of a low-pass filter circuit according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The invention comprises a power frequency rogowski coil with multi-range output, which is used for measuring a large current range and a small current range, wherein the power frequency rogowski coil comprises a rogowski coil 1, an integrating circuit 2, an amplifying circuit 3 and a low-pass filter circuit 4;
the non-inverting input end and the inverting input end of the integrating circuit 2 are respectively connected to the first output end 10 and the second output end 11 of the rogowski coil 1, and the integrating circuit 2 is used for integrating and converting a current signal measured by the rogowski coil 1 into a voltage signal;
the amplifying circuit 3 comprises a wide-range amplifying circuit 30 and a small-range amplifying circuit 31;
The positive input end of the wide-range amplifying circuit 30 is connected with the output end of the integrating circuit 2, and the wide-range amplifying circuit 30 is used for amplifying a wide-range voltage signal;
The positive input end of the small-range amplifying circuit 31 is connected with the output end of the integrating circuit 2, and the small-range amplifying circuit 31 is used for amplifying a small-range voltage signal;
The low-pass filter circuit 4 is respectively connected to the output ends of the wide-range amplifying circuit 30 and the small-range amplifying circuit 31, and the low-pass filter circuit 4 respectively performs low-pass filtering on the output signals of the wide-range amplifying circuit 30 and the small-range amplifying circuit 31 and outputs the low-pass filtered signals through the wide-range output end 40 and the small-range output end 41.
The technical scheme of the power frequency rogowski coil with multi-range output is that as shown in fig. 1, the power frequency rogowski coil with multi-range output is used for measuring a large current range and a small current range, and comprises a rogowski coil 1, an integrating circuit 2, an amplifying circuit 3 and a low-pass filter circuit 4;
Further, the rogowski coil 1 is used for measuring power frequency current, which not only can meet the test range of large current, but also can meet the test precision requirement of small current, the integrating circuit 2 is used for integrating and converting the current signal measured by the rogowski coil 1 into a voltage signal, the amplifying circuit 3 comprises a wide-range amplifying circuit 30 and a small-range amplifying circuit 31, the wide-range amplifying circuit 30 is used for amplifying the voltage signal of the wide range, the small-range amplifying circuit 31 is used for amplifying the voltage signal of the small range, the low-pass filtering circuit 4 respectively carries out low-pass filtering on the output signals of the wide-range amplifying circuit 30 and the small-range amplifying circuit 31, and outputs the signals through a wide-range output end 40 and a small-range output end 41 respectively;
Further, the industrial frequency rogowski coil with multi-range output is provided with two range output ends, so that the large-current testing range can be met, the small-current measuring precision requirement can also be met, the construction difficulty on the site is further reduced, and the measuring precision of the current is improved.
In a preferred embodiment, the integrating circuit 2 comprises:
A first operational amplifier U1, wherein a non-inverting input terminal of the first operational amplifier U1 is connected to the first output terminal 10, and an inverting input terminal of the first operational amplifier U1 is connected to the second output terminal 11 through a first resistor R1;
the second resistor R2 is connected with the inverting input end of the first operational amplifier U1 and the output end of the first operational amplifier U1;
the first capacitor C1 is connected with the inverting input end of the first operational amplifier U1 and the output end of the first operational amplifier U1;
the ground GND is connected to the non-inverting input of the first operational amplifier U1.
Specifically, as shown in fig. 2, an integrating circuit, 2, is composed of a first operational amplifier U1, a first resistor R1, a second resistor R2, and a first capacitor C1, and is used for integrating and converting a current signal measured by the rogowski coil 1 into a voltage signal.
It should be noted that, the integrating circuit 2 is widely applied in the technical field, and is not limited to the integrating circuit 2 for realizing the function of integrating and converting the current signal into the voltage signal, and will not be described herein.
In a preferred embodiment, the wide range amplifying circuit 30 comprises:
the phase input end of the second operational amplifier U2 is connected with the output end of the first operational amplifier U2 through a second capacitor C2, and the inverting input end of the second operational amplifier U2 is connected with the output end of the second operational amplifier U2 through a third resistor R3;
a fourth resistor R4 connected between the inverting input terminal of the second operational amplifier U2 and the ground GND;
a fifth resistor R5 connected between the non-inverting input terminal of the second operational amplifier U2 and the ground GND.
Specifically, as shown in fig. 3, the wide-range amplifying circuit 30 composed of the second operational amplifier U2, the second capacitor C2, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 is configured to amplify a wide-range voltage signal, so that the power frequency rogowski coil with multi-range output meets a wide-range measurement range, thereby reducing construction difficulty on site and improving measurement accuracy of current.
In a preferred embodiment, the small-scale amplifying circuit 31 comprises:
The non-inverting input end of the third operational amplifier U3 is connected with the output end of the first operational amplifier U1 through a third capacitor C3, and the inverting input end of the third operational amplifier U3 is connected with the output end of the third operational amplifier U3 through a sixth resistor R6;
A seventh resistor R7 connected between the inverting input terminal of the third operational amplifier U3 and the ground GND;
an eighth resistor R8 is connected between the non-inverting input terminal of the third operational amplifier U3 and the ground GND.
Specifically, as shown in fig. 4, the small-range amplifying circuit 31 composed of the third operational amplifier U3, the third capacitor C3, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 is configured to amplify a voltage signal with a large-scale range, so that the power frequency rogowski coil with multi-scale output meets the requirement of small-scale test precision, thereby reducing the construction difficulty on site and improving the measurement precision of current.
In a preferred embodiment, the low-pass filter circuit 4 comprises:
the non-inverting input end of the fourth operational amplifier U4 is connected with the ground end GND through a fourth capacitor C4, and the inverting input end of the fourth operational amplifier U4 is connected with the output end of the fourth operational amplifier U4;
A fifth capacitor C5 connected between the non-inverting input terminal of the fourth operational amplifier U4 and the output terminal of the fourth operational amplifier U4 through a ninth resistor R9;
a tenth resistor R10 connected between the output of the wide-range amplifying circuit 30 and/or the small-range amplifying circuit 31 and the ninth resistor R9.
Specifically, as shown in fig. 5, the low-pass filter circuit 4 composed of the fourth operational amplifier U4, the fourth capacitor C4, the fifth capacitor C5, the ninth resistor R9 and the tenth resistor R10 respectively performs low-pass filtering on the output signals of the wide-range amplifying circuit 30 and the small-range amplifying circuit 31, and outputs the signals through the wide-range output end 40 and the small-range output end 41 respectively, so that the power frequency rogowski coil with multi-range output has two range output ends, including the wide-range output end 40 and the small-range output end 41, not only can the testing range of large current be met, but also the measurement precision requirement of small current can be met, further the construction difficulty on site is reduced, and the measurement precision of current is improved.
In a preferred embodiment, the first operational amplifier U1, the second operational amplifier U2 and the third operational amplifier U3 each include a positive power terminal and a negative power terminal;
the voltage of the positive power supply terminal is +5V, and the voltage of the negative power supply terminal is-5V.
In a preferred embodiment, the fourth operational amplifier U4 includes a positive power terminal and a negative power terminal;
the voltage of the positive power supply terminal is +5V, and the voltage of the negative power supply terminal is-5V.
Specifically, the first operational amplifier U1, the second operational amplifier U2, the third operational amplifier U3, and the fourth operational amplifier U4 are all powered by dual power supplies, wherein the voltage of the positive power supply terminal is +5v, and the voltage of the negative power supply terminal is-5V.
The foregoing description is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included within the scope of the present invention.
Claims (7)
1. The power frequency rogowski coil with multi-range output is used for measuring a large current range and a small current range, and is characterized by comprising a rogowski coil, an integrating circuit, an amplifying circuit and a low-pass filter circuit;
The positive phase input end and the negative phase input end of the integrating circuit are respectively connected with the first output end and the second output end of the rogowski coil, and the integrating circuit is used for integrating and converting a current signal measured by the rogowski coil into a voltage signal;
the amplifying circuit comprises a wide-range amplifying circuit and a small-range amplifying circuit;
The positive input end of the wide-range amplifying circuit is connected with the output end of the integrating circuit, and the wide-range amplifying circuit is used for amplifying the voltage signal with a wide range;
The positive input end of the small-range amplifying circuit is connected with the output end of the integrating circuit, and the small-range amplifying circuit is used for amplifying the voltage signal with a small range;
the low-pass filter circuit is respectively connected to the output ends of the wide-range amplifying circuit and the small-range amplifying circuit, and the low-pass filter circuit respectively carries out low-pass filtering on the output signals of the wide-range amplifying circuit and the small-range amplifying circuit and respectively outputs the signals through the wide-range output end and the small-range output end.
2. The power frequency rogowski coil of claim 1, characterized in that the integrating circuit comprises:
The non-inverting input end of the first operational amplifier is connected with the first output end, and the inverting input end of the first operational amplifier is connected with the second output end through a first resistor;
the second resistor is connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier;
The first capacitor is connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier;
The ground terminal is connected to the non-inverting input terminal of the first operational amplifier.
3. The power frequency rogowski coil of claim 2, characterized in that the wide range amplifying circuit comprises:
The phase input end of the second operational amplifier is connected with the output end of the first operational amplifier through a second capacitor, and the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier through a third resistor;
The fourth resistor is connected between the inverting input end of the second operational amplifier and the grounding end;
And a fifth resistor connected between the non-inverting input end of the second operational amplifier and the grounding end.
4. The power frequency rogowski coil of claim 3, wherein the small-scale amplifying circuit comprises:
The positive input end of the third operational amplifier is connected with the output end of the first operational amplifier through a third capacitor, and the negative input end of the third operational amplifier is connected with the output end of the third operational amplifier through a sixth resistor;
a seventh resistor connected between the inverting input terminal of the third operational amplifier and the ground terminal;
and the eighth resistor is connected between the non-inverting input end of the third operational amplifier and the grounding end.
5. The power frequency rogowski coil of claim 1, characterized in that the low pass filtering circuit comprises:
The non-inverting input end of the fourth operational amplifier is connected with the grounding end through a fourth capacitor, and the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier;
The fifth capacitor is connected between the non-inverting input end of the fourth operational amplifier and the output end of the fourth operational amplifier through a ninth resistor;
And the tenth resistor is connected between the output ends of the wide-range amplifying circuit and the small-range amplifying circuit and the ninth resistor.
6. The power frequency rogowski coil of claim 4, wherein the first operational amplifier, the second operational amplifier, and the third operational amplifier each comprise a positive power supply terminal and a negative power supply terminal;
The voltage of the positive power supply end is +5V, and the voltage of the negative power supply end is-5V.
7. The power frequency rogowski coil of claim 5, wherein the fourth operational amplifier comprises a positive power supply terminal and a negative power supply terminal;
The voltage of the positive power supply end is +5V, and the voltage of the negative power supply end is-5V.
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| CN201810603498.9A CN108562776B (en) | 2018-06-12 | 2018-06-12 | Power frequency rogowski coil with multi-range output |
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| CN111983282A (en) * | 2020-08-20 | 2020-11-24 | 青岛鼎信通讯股份有限公司 | Detection circuit applied to power electronic transformer power module resonant current |
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| CN208224341U (en) * | 2018-06-12 | 2018-12-11 | 上海海能信息科技有限公司 | A kind of power frequency Rogowski coil with multrirange output |
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| CN201226021Y (en) * | 2008-06-27 | 2009-04-22 | 陕西电力科学研究院 | Apparatus for recording lighting strike of overhead transmission line |
| EP2420849B1 (en) * | 2010-08-20 | 2019-10-23 | General Electric Technology GmbH | Rogowski coil assembly |
| CN102854535B (en) * | 2012-08-24 | 2015-03-11 | 中国船舶重工集团公司第七二二研究所 | Broadband magnetic sensor |
| DE102013200479A1 (en) * | 2013-01-15 | 2014-07-17 | Siemens Aktiengesellschaft | Measurement device for measuring electric power transmitted via conductor, has power detector that determines electrical power from current signal and voltage signal determined by current and voltage measuring units respectively |
| CN103616549A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | Broadband low-current measurement device based on isolated PCB-type Rogowski coil |
| WO2017197269A1 (en) * | 2016-05-13 | 2017-11-16 | The University Of North Carolina At Charlotte | Wideband contactless magnetoresistive-rogowski current sensing |
| CN206020511U (en) * | 2016-09-13 | 2017-03-15 | 广东石油化工学院 | A kind of current sensor based on Luo-coil |
| CN106383267A (en) * | 2016-09-30 | 2017-02-08 | 广西电网有限责任公司电力科学研究院 | Software integrator used for Rogowski coil current transformer |
| CN206546387U (en) * | 2017-03-13 | 2017-10-10 | 珠海派诺科技股份有限公司 | A kind of changeable range current mode Rogowski coil integrator |
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