CN108872684B - A new passive AC current acquisition circuit - Google Patents
A new passive AC current acquisition circuit Download PDFInfo
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- CN108872684B CN108872684B CN201811086376.3A CN201811086376A CN108872684B CN 108872684 B CN108872684 B CN 108872684B CN 201811086376 A CN201811086376 A CN 201811086376A CN 108872684 B CN108872684 B CN 108872684B
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- 230000007547 defect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- General Physics & Mathematics (AREA)
- Ac-Ac Conversion (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention discloses a novel passive alternating current acquisition circuit which comprises a first low-power coil, a third low-power coil, a first resistor, a second resistor, a fourth resistor and a high-precision transformer, wherein the first low-power coil, the second low-power coil and the third low-power coil are grounded and connected with one end of a primary coil of the high-precision transformer, the other end of the first resistor, the other end of the second resistor and the other end of the third resistor are connected, the connected ends of the first resistor, the second resistor and the third resistor are connected with the other end of the primary coil of the high-precision transformer, and the fourth resistor is connected with a secondary coil of the high-precision transformer. The novel passive alternating current acquisition circuit can acquire three-phase large current signals, convert the large current signals into small voltage signals for output, synthesize a current zero sequence by hardware and convert the current zero sequence into voltage signals, and ensure the amplitude accuracy and the phase accuracy.
Description
Technical Field
The invention relates to a novel passive alternating current acquisition circuit.
Background
The conventional CT adopts an electromagnetic principle coil to output a current signal, has the defects of incapability of opening a circuit, large volume and the like, and needs a single zero sequence current coil when the conventional CT is used for producing zero sequence, and the coil precision is difficult to be high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a novel passive alternating current acquisition circuit which can acquire three-phase large current signals, convert the large current signals into small voltage signals for output, synthesize a current zero sequence by hardware and convert the current zero sequence into voltage signals, and ensure the amplitude accuracy and the phase accuracy.
The technical scheme for achieving the purpose is that the novel passive alternating current acquisition circuit comprises a first low-power coil, a third low-power coil, a first resistor, a fourth resistor and a high-precision transformer, wherein:
One end of the first low-power coil, one end of the second low-power coil and one end of the third low-power coil are connected, and the grounding ends of the first low-power coil, the second low-power coil and the third low-power coil are grounded and connected with one end of a primary coil of the high-precision transformer;
The other end of the first low-power coil, the other end of the second low-power coil and the other end of the third low-power coil are connected with one end of the first resistor, one end of the second resistor and one end of the third resistor in a one-to-one correspondence manner;
The other end of the first resistor, the other end of the second resistor and the other end of the third resistor are connected, and the connected ends of the first resistor, the second resistor and the third resistor are connected to the other end of the primary coil of the high-precision transformer;
The fourth resistor is connected to the secondary coil of the high-precision transformer.
The novel passive alternating current acquisition circuit, wherein the first low-power coil and the first resistor are connected in series, collecting an A-phase positive sequence current signal, converting the A-phase positive sequence current signal into a voltage signal and outputting the voltage signal;
The second low-power coil is connected with a second resistor in series, and is used for collecting a B-phase positive sequence current signal and converting the B-phase positive sequence current signal into a voltage signal to be output;
The third low-power coil is connected with a third resistor in series, and is used for collecting a C-phase positive sequence current signal and converting the C-phase positive sequence current signal into a voltage signal to be output;
And the secondary coil of the high-precision transformer is connected with the fourth resistor in parallel, the zero sequence current value is collected, and the zero sequence current value is converted into a voltage signal to be output.
The novel passive alternating current acquisition circuit acquires three-phase large current signals, converts the large current signals into small voltage signals for output, synthesizes a current zero sequence by hardware and converts the current zero sequence into voltage signals, and ensures the amplitude accuracy and the phase accuracy at the same time
Drawings
Fig. 1 is a circuit diagram of a novel passive ac current harvesting circuit of the present invention.
Detailed Description
In order to enable those skilled in the art to better understand the technical scheme of the present invention, the following detailed description is provided with reference to the accompanying drawings:
Referring to fig. 1, in a preferred embodiment of the present invention, a novel passive ac current collection circuit includes first to third low power coils, first to fourth resistors, and a high-precision transformer CT0.
One end of the first low-power coil CTA, one end of the second low-power coil CTB and one end of the third low-power coil CTC are connected, the connected ends of the first low-power coil CTA, the second low-power coil CTB and the third low-power coil CTC are grounded and connected with one end of a primary coil of the high-precision transformer CT0, the other end of the first low-power coil CTA, the other end of the second low-power coil CTB and the other end of the third low-power coil CTC are connected with one end of a first resistor R ia, one end of a second resistor R ib and one end of a third resistor R ic in a one-to-one correspondence manner, the other end of the first resistor R ia, the other end of the second resistor R ib and the other end of the third resistor R ic are connected, the connected with the connected end of the first resistor R ia, the second resistor R ib and the connected end of the third resistor R ic is connected with the other end of the primary coil of the high-precision transformer CT0, and the fourth resistor R I0 is connected with the secondary coil of the high-precision transformer CT 0.
The novel passive alternating current acquisition circuit comprises a first low-power coil CTA and a first resistor R ia which are connected in series, an A-phase positive sequence current signal I A is acquired, the A-phase positive sequence current signal I A is converted into a voltage signal U Ia to be output, a second low-power coil CTB and a second resistor R ib which are connected in series, a B-phase positive sequence current signal I B is acquired, the B-phase positive sequence current signal I B is converted into a voltage signal U Ib to be output, a third low-power coil CTC and a third resistor R ic which are connected in series, a C-phase positive sequence current signal I C is acquired, the C-phase positive sequence current signal I C is converted into a voltage signal U Ic to be output, the connection ends of the first resistor R ia, the second resistor R ib and the third resistor R ic are connected in parallel to a primary coil of a high-precision transformer CTO, and a secondary coil of the high-precision transformer CTO is connected in parallel to a fourth resistor RI0, and the zero sequence current value is acquired and converted into the voltage signal U I0 to be output.
The invention relates to a novel passive alternating current acquisition circuit, which comprises:
(1) The low-power coil is adopted, and the current signal is converted into the voltage signal, so that the problem of open circuit is avoided, and the volume is greatly reduced;
(2) The method does not need an independent zero sequence current coil, adopts a hardware synthesis mode, namely a mode that a high-precision transformer CTO is connected with a resistor to collect zero sequence current values, converts the zero sequence current values into voltage signals to be output, saves space, and has high precision;
(3) The voltage signal output is adopted, and the wiring and the cable line at the side of the controller can be made of thin wires, so that the wiring is convenient.
In summary, the novel passive alternating current acquisition circuit can acquire three-phase large current signals, convert the large current signals into small voltage signals and output the small voltage signals, synthesize a current zero sequence by hardware and convert the current zero sequence into voltage signals, and ensure the amplitude accuracy and the phase accuracy.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (2)
1. The utility model provides a novel passive alternating current acquisition circuit which characterized in that, includes first ~ third low power coil, first ~ fourth resistance and high accuracy mutual-inductor, wherein:
One end of the first low-power coil, one end of the second low-power coil and one end of the third low-power coil are connected, and the grounding ends of the first low-power coil, the second low-power coil and the third low-power coil are grounded and connected with one end of a primary coil of the high-precision transformer;
The other end of the first low-power coil, the other end of the second low-power coil and the other end of the third low-power coil are connected with one end of the first resistor, one end of the second resistor and one end of the third resistor in a one-to-one correspondence manner;
The other end of the first resistor, the other end of the second resistor and the other end of the third resistor are connected, and the connected ends of the first resistor, the second resistor and the third resistor are connected to the other end of the primary coil of the high-precision transformer;
The fourth resistor is connected to the secondary coil of the high-precision transformer.
2. The novel passive alternating current acquisition circuit according to claim 1, wherein the first low-power coil is connected in series with a first resistor, acquires an a-phase positive sequence current signal, and converts the a-phase positive sequence current signal into a voltage signal for output;
The second low-power coil is connected with a second resistor in series, and is used for collecting a B-phase positive sequence current signal and converting the B-phase positive sequence current signal into a voltage signal to be output;
The third low-power coil is connected with a third resistor in series, and is used for collecting a C-phase positive sequence current signal and converting the C-phase positive sequence current signal into a voltage signal to be output;
And the secondary coil of the high-precision transformer is connected with the fourth resistor in parallel, the zero sequence current value is collected, and the zero sequence current value is converted into a voltage signal to be output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811086376.3A CN108872684B (en) | 2018-09-18 | 2018-09-18 | A new passive AC current acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811086376.3A CN108872684B (en) | 2018-09-18 | 2018-09-18 | A new passive AC current acquisition circuit |
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| Publication Number | Publication Date |
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| CN108872684A CN108872684A (en) | 2018-11-23 |
| CN108872684B true CN108872684B (en) | 2025-01-14 |
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| CN201811086376.3A Active CN108872684B (en) | 2018-09-18 | 2018-09-18 | A new passive AC current acquisition circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110058071A (en) * | 2019-04-30 | 2019-07-26 | 上海固缘电力科技有限公司 | Zero sequence current sensor circuit topology and switch pole |
| CN111856112A (en) * | 2020-06-18 | 2020-10-30 | 上海置信智能电气有限公司 | High-precision zero-sequence current sensor based on current synthesis and precise magneto-potential conversion |
| CN116500328A (en) * | 2023-06-06 | 2023-07-28 | 无锡市锡山湖光电器有限公司 | High-precision three-phase current sensor |
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| CN208860887U (en) * | 2018-09-18 | 2019-05-14 | 上海固缘电力科技有限公司 | A Novel Passive AC Current Acquisition Circuit |
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| GB347616A (en) * | 1929-12-19 | 1931-04-20 | Alfred Mills Taylor | Means for and methods of protecting conductors in 4-phase and 2-phase circuits |
| CN102135561B (en) * | 2011-02-23 | 2013-11-13 | 山东大学 | Measuring device and method for zero-sequence current of non-effectively neutral grounded system |
| CN102156219B (en) * | 2011-03-21 | 2013-06-12 | 保定市理想电器设备制造有限公司 | Multifunctional integrated high-pressure metering device |
| CN102497118A (en) * | 2011-12-29 | 2012-06-13 | 杭州四达电炉成套设备有限公司 | Passive isolation sampling circuit for output direct current of three-phase rectifier bridge |
| CN102928645B (en) * | 2012-10-18 | 2015-09-09 | 北京航空航天大学 | A kind of electric capacity being applied to 10kV power distribution network surveys potential circuit device |
| CN103675433A (en) * | 2013-12-12 | 2014-03-26 | 国家电网公司 | Current sampling and protecting circuit for electronic current transformer |
| CN204177858U (en) * | 2014-11-12 | 2015-02-25 | 福建龙净环保股份有限公司 | A kind of three-phase electricity testing circuit |
| CN204464038U (en) * | 2015-03-16 | 2015-07-08 | 中国计量学院 | Three-phase Combined Transformer Based on Transformation Output of Orthogonal Coordinate System |
| CN105391044B (en) * | 2015-11-26 | 2017-10-20 | 江苏大全凯帆开关有限公司 | A kind of earth-fault current detection circuit and method |
| CN105510678A (en) * | 2016-01-21 | 2016-04-20 | 上海固缘电力科技有限公司 | Novel alternative current high voltage acquisition circuit |
| CN105938167B (en) * | 2016-06-16 | 2019-04-02 | 贵阳英纳瑞电气有限公司 | Direct current system exchange scurries into localization of fault and searches device and method |
| CN105958440A (en) * | 2016-06-29 | 2016-09-21 | 常熟市立得电器有限公司 | Tripolar disconnection leakage protection plug |
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| CN208860887U (en) * | 2018-09-18 | 2019-05-14 | 上海固缘电力科技有限公司 | A Novel Passive AC Current Acquisition Circuit |
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