CN108872684A - A kind of novel passive AC current collecting circuit - Google Patents
A kind of novel passive AC current collecting circuit Download PDFInfo
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- CN108872684A CN108872684A CN201811086376.3A CN201811086376A CN108872684A CN 108872684 A CN108872684 A CN 108872684A CN 201811086376 A CN201811086376 A CN 201811086376A CN 108872684 A CN108872684 A CN 108872684A
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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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Abstract
The invention discloses a kind of novel passive AC current collecting circuits, including first~third low-power coil, the first~the 4th resistance and high-precision mutual inductor, the abutment end of the first low-power coil, the second low-power coil and third low-power coil is grounded and one end of the primary coil that accesses the high-precision mutual inductor；The other end, the other end of second resistance of the first resistor are connected with the other end of 3rd resistor, and the abutment end of the first resistor, second resistance and 3rd resistor accesses the other end of the primary coil of the high-precision mutual inductor；4th resistance is connected on the secondary coil of the high-precision mutual inductor.Novel passive AC current collecting circuit of the invention, three-phase high current signal can be acquired, high current signal is converted into the output of small voltage signal, and synthesizing a current zero sequence and be converted to voltage signal with hardware, while guaranteeing amplitude precision, it is ensured that the precision of phase.
Description
Technical field
The present invention relates to a kind of novel passive AC current collecting circuits.
Background technique
The disadvantages of conventional CT uses electromagnetic principle coil, and output current signal, existing cannot open a way, and volume is big, Er Qiechang
Rule CT will produce zero sequence and then need an individual zero-sequence current coil, and this coil precision is difficult to do height.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies of existing technologies, a kind of novel passive AC current collecting circuit is provided, it can
To acquire three-phase high current signal, high current signal is converted into the output of small voltage signal, and synthesize an electricity with hardware
Stream zero sequence is simultaneously converted to voltage signal, while guaranteeing amplitude precision, it is ensured that the precision of phase.
Realizing the technical solution of above-mentioned purpose is：A kind of novel passive AC current collecting circuit, including first~third
Low-power coil, the first~the 4th resistance and high-precision mutual inductor, wherein：
One end phase of one end of the first low-power coil, one end of the second low-power coil and third low-power coil
Even, and the abutment end of the first low-power coil, the second low-power coil and third low-power coil is grounded and accesses described
One end of the primary coil of high-precision mutual inductor；
The other end of the first low-power coil, the other end of the second low-power coil and third low-power coil it is another
One end is connected with one end of one end of the first resistor, one end of second resistance and 3rd resistor correspondingly；
The other end, the other end of second resistance of the first resistor are connected with the other end of 3rd resistor, and described
The abutment end of one resistance, second resistance and 3rd resistor accesses the other end of the primary coil of the high-precision mutual inductor；
4th resistance is connected on the secondary coil of the high-precision mutual inductor.
Above-mentioned a kind of novel passive AC current collecting circuit, wherein the first low-power coil and first resistor
Series connection acquires A phase forward-order current signal, and A phase forward-order current signal is converted to voltage signal output；
The second low-power coil and second resistance series connection, acquire B phase forward-order current signal, and by B phase forward-order current
Signal is converted to voltage signal output；
The third low-power coil and 3rd resistor series connection, acquire C phase forward-order current signal, and by C phase forward-order current
Signal is converted to voltage signal output；
The secondary coil of the high-precision mutual inductor and the 4th resistor coupled in parallel, acquire zero-sequence current value, and by zero sequence
Current value is converted to voltage signal output.
Novel passive AC current collecting circuit of the invention acquires three-phase high current signal, high current signal is converted
For the output of small voltage signal, and synthesizing a current zero sequence and be converted to voltage signal with hardware, guaranteeing amplitude precision
While, it is ensured that the precision of phase
Detailed description of the invention
Fig. 1 is the circuit diagram of novel passive AC current collecting circuit of the invention.
Specific embodiment
It is right with reference to the accompanying drawing in order to make those skilled in the art be better understood when technical solution of the present invention
Its specific embodiment is described in detail：
Referring to Fig. 1, highly preferred embodiment of the present invention, a kind of novel passive AC current collecting circuit, including first~
Third low-power coil, the first~the 4th resistance and high-precision mutual inductor CT0.
One end of first low-power coil CTA, one end of the second low-power coil CTB and third low-power coil CTC
One end is connected, and the abutment end of the first low-power coil CTA, the second low-power coil CTB and third low-power coil CTC are grounded
And access one end of the primary coil of high-precision mutual inductor CT0；The other end of first low-power coil CTA, the second low-power line
Enclose CTB the other end and third low-power coil CTC the other end correspondingly with first resistor RiaOne end, second resistance
RibOne end and 3rd resistor RicOne end be connected；First resistor RiaThe other end, second resistance RibThe other end and third electricity
Hinder RicThe other end be connected, and first resistor Ria, second resistance RibWith 3rd resistor RicAbutment end access high-precision mutual inductor
The other end of the primary coil of CT0；4th resistance RI0It is connected on the secondary coil of high-precision mutual inductor CT0.
A kind of novel passive AC current collecting circuit of the invention, the first low-power coil CTA and first resistor RiaString
Connection acquires A phase forward-order current signal IA, and by A phase forward-order current signal IABe converted to voltage signal UIaOutput；Second low-power
Coil CTB and second resistance RibSeries connection acquires B phase forward-order current signal IB, and by B phase forward-order current signal IBBe converted to voltage
Signal UIbOutput；Third low-power coil CTC and 3rd resistor RicSeries connection acquires C phase forward-order current signal IC, and just by C phase
Sequence current signal ICBe converted to voltage signal UIcOutput；First resistor Ria, second resistance RibWith 3rd resistor RicThe termination that connects
Enter the primary coil of high-precision mutual inductor CTO, the secondary coil of high-precision mutual inductor CTO is in parallel with the 4th resistance RI0, acquisition zero
Sequence current value, and zero-sequence current value is converted into voltage signal UI0Output.
In a kind of novel passive AC current collecting circuit of the invention：
(1) the problem of using low-power coil, and current signal be converted into voltage signal, open circuit is not present, and body
Product is substantially reduced；
(2) individual zero-sequence current coil is not needed, is high-precision mutual inductor CTO and resistance by the way of hardware synthesis
Connected mode acquires zero-sequence current value, and zero-sequence current value is converted to voltage signal output, saves space, and precision can be with
Accomplish very high；
(3) it is exported using voltage signal, the wiring of controller side and cable can use filament, facilitate wiring.
In conclusion novel passive AC current collecting circuit of the invention, can acquire three-phase high current signal, it will be big
Current signal is converted to the output of small voltage signal, and synthesizing a current zero sequence and be converted to voltage signal with hardware,
While guaranteeing amplitude precision, it is ensured that the precision of phase.
Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate the present invention,
And be not used as limitation of the invention, as long as the change in spirit of the invention, to embodiment described above
Change, modification will all be fallen within the scope of claims of the present invention.
Claims (2)
1. a kind of novel passive AC current collecting circuit, which is characterized in that including first~third low-power coil, first~
4th resistance and high-precision mutual inductor, wherein：
One end of the first low-power coil, the second low-power coil one end be connected with one end of third low-power coil,
And the abutment end of the first low-power coil, the second low-power coil and third low-power coil is grounded and accesses described high-precision
Spend one end of the primary coil of mutual inductor；
The other end of the other end of the first low-power coil, the other end of the second low-power coil and third low-power coil
It is connected correspondingly with one end of one end of the first resistor, one end of second resistance and 3rd resistor；
The other end, the other end of second resistance of the first resistor are connected with the other end of 3rd resistor, and first electricity
The abutment end of resistance, second resistance and 3rd resistor accesses the other end of the primary coil of the high-precision mutual inductor；
4th resistance is connected on the secondary coil of the high-precision mutual inductor.
2. a kind of novel passive AC current collecting circuit according to claim 1, which is characterized in that the first low function
Rate coil and first resistor series connection, acquire A phase forward-order current signal, and it is defeated that A phase forward-order current signal is converted to voltage signal
Out；
The second low-power coil and second resistance series connection, acquire B phase forward-order current signal, and by B phase forward-order current signal
Be converted to voltage signal output；
The third low-power coil and 3rd resistor series connection, acquire C phase forward-order current signal, and by C phase forward-order current signal
Be converted to voltage signal output；
The secondary coil of the high-precision mutual inductor and the 4th resistor coupled in parallel, acquire zero-sequence current value, and by zero-sequence current
Value is converted to voltage signal output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811086376.3A CN108872684A (en) | 2018-09-18 | 2018-09-18 | A kind of novel passive AC current collecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811086376.3A CN108872684A (en) | 2018-09-18 | 2018-09-18 | A kind of novel passive AC current collecting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN108872684A true CN108872684A (en) | 2018-11-23 |
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| CN201811086376.3A Pending CN108872684A (en) | 2018-09-18 | 2018-09-18 | A kind of novel passive AC current collecting circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 magnetomotive transformation |
| 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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| CN102135561A (en) * | 2011-02-23 | 2011-07-27 | 山东大学 | Measuring device and method for zero-sequence current of non-effectively neutral grounded system |
| CN102156219A (en) * | 2011-03-21 | 2011-08-17 | 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 |
| CN102928645A (en) * | 2012-10-18 | 2013-02-13 | 北京航空航天大学 | Voltage measurement circuit device applied to 10-kV power distribution network by applying capacitance |
| 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 |
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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 |
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