CN104200978B - A kind of current transformer intelligent electricity-fetching method - Google Patents
A kind of current transformer intelligent electricity-fetching method Download PDFInfo
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- CN104200978B CN104200978B CN201410447898.7A CN201410447898A CN104200978B CN 104200978 B CN104200978 B CN 104200978B CN 201410447898 A CN201410447898 A CN 201410447898A CN 104200978 B CN104200978 B CN 104200978B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004804 winding Methods 0.000 claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 16
- 230000004907 flux Effects 0.000 description 6
- 230000001932 seasonal effect Effects 0.000 description 4
- 230000002463 transducing effect Effects 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
A kind of current transformer intelligent electricity-fetching method, it comprises the following steps: adopt multiple same current transformer that bus carries out the current acquisition of 300mA-10A, the secondary current size of each current transformer is identical, direction is identical, has namely got n separate electric current from bus；The n collected a separate electric current is converged in the nanocrystalline primary side winding collecting iron core, induces an alternating current I at the nanocrystalline vice-side winding collecting iron core3, the alternating current I that obtains3It is transformed to direct current by rectification circuit, then utilizes series boosting resistance, bring the voltage up, finally adopt the mode of trickle charge that super large capacitor is charged, complete intelligence power taking.Present invention have the advantage that not by region, weather, the restriction of time, the electricity on bus can be extracted constantly；Impact will not be produced to electrical network is properly functioning；Easy to use, maintenance cost is low；Intelligence power taking scope is wide, it is possible to extract bus current during no-load transformer.
Description
Technical field
The present invention relates to current transformer technology, the method particularly relating to a kind of small area analysis power taking of distribution automation terminal.
Background technology
In power system, there is much on-line monitoring equipment that long-term, stable, feasible power supply all must be used to be powered.Mostly current distribution automation terminal power supply is to adopt the mode such as adjacent power distribution station low-voltage power supply, voltage transformer pt power taking, solar energy power taking and traditional Current Transmit power taking.These several power supply modes also exist following deficiency: adjacent power distribution station low-voltage power supply shortcoming be in that near there is no during power distribution station cannot adopt, power distribution station scheduled outage or break down and can cause monitoring equipment power delivery termination；The distribution automation terminal power volume of voltage transformer pt power taking is big, manufacturing cost is high, installation is inconvenient, installs and is difficult to, and the PT of outdoor installation is subject to damage, makes safety in operation be affected in the space of ring main unit or other small volume；Solar energy way to take power is to utilize photovoltaic generation, is affected relatively big by natural environment and climate, and night cannot power, relatively costly, it is easy to damages；The difficult point that conventional current transformer CT powers is in that how to obtain enough power under less primary current, simultaneously when primary current is very big, it is prevented that the overvoltage of power supply and overheated.Accordingly, it would be desirable to research and develop the current transformer that volume is little, cost is low, power supply is stable, can adapt to wide scope power taking, thus meeting the requirement of distribution automation terminal device power supply (DPS).
Summary of the invention
A kind of current transformer intelligent electricity-fetching method provided by the present invention, it is capable of the bus current collection constantly from 300mA to 10A, seasonal power is provided for distribution automation terminal equipment, there is the features such as cost is low, life-span length, power supply is stable, power taking scope is wide, be the Perfected process solving existing distribution automation terminal device power supply (DPS).
It is an object of the invention to by following technical scheme realization, it comprises the following steps:
(1) current acquisition
Adopt multiple same current transformer that bus current carries out the Real-time Collection of 300mA-10A, the primary side winding number of turn N of each current transformer1And vice-side winding number of turn N21It is one, it is achieved the electric current that each current transformer collects is maximum, according to magnetic potential balance equation,
I1N1+I21N21=I0N1
Draw the secondary current I of single current transformer21,
I21=I0-I1
I in above formula1For electrical network bus current, I21For the secondary current of single current transformer, I0For the exciting current of single current transformer, N1For the primary side winding number of turn of single current transformer, N21For the vice-side winding number of turn of single current transformer,
The secondary current size of each current transformer is identical, direction is identical, has namely got n separate electric current from bus；
(2), electric current collects
N step (1) collected a separate electric current converges in a nanocrystalline primary side winding collecting iron core, induces an alternating current I at the nanocrystalline vice-side winding collecting iron core3；
(3), electric energy stores
The alternating current I that will obtain in step (2)3It is transformed to direct current by rectification circuit, then utilizes series boosting resistance, bring the voltage up, finally adopt the mode of trickle charge that super large capacitor is charged, complete intelligence power taking.
The electric energy obtained by said method can provide seasonal power to distribution automation terminal equipment after storing, whole accumulation of energy process takes the thinking of " with time transducing ", constantly in the way of trickle charge, electric energy is stored in electric capacity, reach the rated capacity of electric capacity, to meet the purpose providing seasonal power for distribution automation terminal equipment, the electric energy collected due to single current transformer is less, cannot meeting needs, therefore the quantity to increase current transformer guarantees to get enough electric energy from bus.
Apply the method for the invention in distribution automation terminal equipment power supply, achieve breakthrough progress technically, overcome the power supply " dead band " of tradition transformer, have employed the thinking of " with time transducing ", utilize multiple the taking can current sensors, a current transformer structure collecting iron core, gather the electric energy on bus constantly, charge for energy storage system in the mode of trickle charge, reach to provide for electrical equipment the power supply of periodic duty.
It is constant-current source that electrical network median generatrix electric current can look at any one time, for n identical current transformer, its primary current has the characteristic that size is identical, direction is identical, have employed identical nanocrystalline iron core, the identical turn ratio, identical load simultaneously, then the secondary current of each current transformer also should have the feature that size is identical, direction is identical, has namely got n separate electric current from bus.
Electric current collect in nanocrystalline iron core essence of collecting be adopt the current transformer of n primary side winding and a vice-side winding,
One primary current will produce a main flux, and n primary current will produce n main flux, and owing to n separate current has identical character, then n main flux is overlapped mutually, and induces an electric current at secondary, it is achieved electric current is collected purpose.For converging iron core, according to magnetic potential balance equation.
nI21N21+I3N3=I'0nN21
Realize nanocrystalline collect iron core output electric current maximum, be necessary for making N3Minimum, therefore N3Take 1, by the secondary current I of current transformer21Substitute into above formula, arrange:
I3=n (I'0-I0+I1)
It follows that the present invention can pass through to increase and decrease the number gathering current transformer regulates the size taking energy transformer secondary current, with engineering demands, thus successfully realizing extracting sufficiently large electric energy from bus.
Present invention have the advantage that a restriction being not affected by region, weather, time, the electricity on bus can be extracted constantly；Two is will not produce impact to electrical network is properly functioning；Three is easy to use, and maintenance cost is low；Four is that intelligence power taking scope is wide, it is possible to extracting bus current during no-load transformer, the present invention is one of current distribution automation terminal optimal mode of equipment power supply.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and act on clearly and be apparent to, below in conjunction with being specifically illustrating, be further elaborated.
A kind of current transformer intelligent electricity-fetching method of the present invention, it comprises the following steps:
(1), current acquisition
Adopt multiple same current transformer that bus current carries out the Real-time Collection of 300mA-10A, the primary side winding number of turn N of each current transformer1And vice-side winding number of turn N21It is one, it is achieved the electric current that each current transformer collects is maximum, according to magnetic potential balance equation,
I1N1+I21N21=I0N1
Draw the secondary current I of single current transformer21,
I21=I0-I1
I in above formula1For electrical network bus current, I21For the secondary current of single current transformer, I0For the exciting current of single current transformer, N1For the primary side winding number of turn of single current transformer, N21For the vice-side winding number of turn of single current transformer,
The secondary current size of each current transformer is identical, direction is identical, has namely got n separate electric current from bus；
(2), electric current collects
N step (1) collected a separate electric current converges in a nanocrystalline primary side winding collecting iron core, induces an alternating current I at the nanocrystalline vice-side winding collecting iron core3；
(3), electric energy stores
The alternating current I that will obtain in step (2)3It is transformed to direct current by rectification circuit, then utilizes series boosting resistance, bring the voltage up, finally adopt the mode of trickle charge that super large capacitor is charged, complete intelligence power taking.
The electric energy obtained by said method can provide seasonal power to distribution automation terminal equipment after storing, whole accumulation of energy process takes the thinking of " with time transducing ", constantly in the way of trickle charge, electric energy is stored in electric capacity, reach the rated capacity of electric capacity, the electric energy collected due to single current transformer is less, it is impossible to meet needs, and therefore the quantity to increase current transformer guarantees to get enough electric energy from bus.
Apply the method for the invention in distribution automation terminal equipment power supply, achieve breakthrough progress technically, overcome the power supply " dead band " of tradition transformer, have employed the thinking of " with time transducing ", utilize multiple the taking can current sensors, one current transformer structure collecting iron core, gather the electric energy on bus constantly, charge in the mode of trickle charge for energy storage system, reach to provide the power supply of periodic duty for electrical equipment, terminate in advance when charging in a cycle T, the electric energy that transformer continues to extract is then by bypass protection resistance consumption.
It is constant-current source that electrical network median generatrix electric current can look at any one time, for n identical current transformer, its primary current has the characteristic that size is identical, direction is identical, have employed identical nanocrystalline iron core, the identical turn ratio, identical load simultaneously, then the secondary current of each current transformer also should have the feature that size is identical, direction is identical, has namely got n separate electric current from bus.
Electric current collect in nanocrystalline iron core essence of collecting be adopt the current transformer of n primary side winding and a vice-side winding,
One primary current will produce a main flux, and n primary current will produce n main flux, and owing to n separate current has identical character, then n main flux is overlapped mutually, and induces an electric current at secondary, it is achieved electric current is collected purpose.For converging iron core, according to magnetic potential balance equation.
nI21N21+I3N3=I'0nN21
Realize nanocrystalline collect iron core output electric current maximum, be necessary for making N3Minimum, therefore N3Take 1, by the secondary current I of current transformer21Substitute into above formula, arrange:
I3=n (I'0-I0+I1)
In above formula, n is the quantity of current transformer, I1For electrical network bus current, I21For the secondary current of single current transformer, I3For the secondary current of current transformer, I0For the exciting current of single current transformer, I'0For the nanocrystalline exciting current collecting iron core, N1The primary side winding quantity of single current transformer, N21Vice-side winding quantity or the nanocrystalline primary side winding quantity collecting iron core, N for single current transformer3Vice-side winding quantity for current transformer.
It follows that the present invention can pass through to increase and decrease the number gathering current transformer regulates the size taking energy transformer secondary current, with engineering demands, thus successfully realizing extracting sufficiently large electric energy from bus.
Can drawing a kind of intelligence electricity getting device according to this method, Fig. 1 is specific embodiment of the invention one structured flowchart, and it includes current acquisition unit 3, electric current collects unit 4 and electric energy stores unit 5；
Wherein, current acquisition unit is made up of multiple mutually isostructural nanocrystalline iron cores 2, primary side winding on each nanocrystalline iron core 2 and vice-side winding is identical and umber of turn is a circle；
Electric current collects unit 4 and is made up of a current transformer, and the primary side winding quantity of current transformer is identical with the multiple nanocrystalline iron core vice-side winding quantity in current acquisition unit, and the vice-side winding number of turn of current transformer is a circle；
Electric energy stores unit 5 and includes rectification circuit, boost resistor and energy storage capacitor, and the outfan of rectification circuit is connected with boost resistor, and boost resistor is connected with electric capacity；
The primary side winding of each the nanocrystalline iron core in above-mentioned current acquisition unit is connected on bus 1, the vice-side winding of each nanocrystalline iron core collects the primary side winding of current transformer in unit respectively and is connected with electric current, and the vice-side winding of current transformer stores the input of rectification circuit in unit and is connected with electric energy.
Claims (1)
1. a current transformer intelligent electricity-fetching method, it is characterised in that it comprises the following steps:
(1), current acquisition
Adopt multiple same current transformer that bus current carries out the Real-time Collection of 300mA-10A, the primary side winding number of turn N of each current transformer1And vice-side winding number of turn N21It is one, it is achieved the electric current that each current transformer collects is maximum, according to magnetic potential balance equation,
I1N1+I21N21=I0N1
Draw the secondary current I of single current transformer21,
I21=I0-I1
I in above formula1For electrical network bus current, I21For the secondary current of single current transformer, I0For the exciting current of single current transformer, N1For the primary side winding number of turn of single current transformer, N21For the vice-side winding number of turn of single current transformer,
The secondary current size of each current transformer is identical, direction is identical, has namely got n separate electric current from bus；
(2), electric current collects
N step (1) collected a separate electric current converges in a nanocrystalline primary side winding collecting iron core, induces an alternating current I at the nanocrystalline vice-side winding collecting iron core3；
(3), electric energy stores
The alternating current I that will obtain in step (2)3It is transformed to direct current by rectification circuit, then utilizes series boosting resistance, bring the voltage up, finally adopt the mode of trickle charge that super large capacitor is charged, complete intelligence power taking.
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| CN201410447898.7A CN104200978B (en) | 2014-09-04 | 2014-09-04 | A kind of current transformer intelligent electricity-fetching method |
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| CN201410447898.7A CN104200978B (en) | 2014-09-04 | 2014-09-04 | A kind of current transformer intelligent electricity-fetching method |
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| CN104200978A CN104200978A (en) | 2014-12-10 |
| CN104200978B true CN104200978B (en) | 2016-06-29 |
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| CN111157859A (en) * | 2020-01-14 | 2020-05-15 | 杭州巨骐信息科技股份有限公司 | Small current electricity taking composite sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202102869U (en) * | 2011-06-25 | 2012-01-04 | 中国电子科技集团公司第五十八研究所 | Large-current plane transformer |
| CN103107012A (en) * | 2013-01-04 | 2013-05-15 | 河南科技大学 | Electronic current transformer and on-line energy-receiving device of high-voltage side of electronic current transformer |
| CN203481916U (en) * | 2013-04-15 | 2014-03-12 | 国家电网公司 | Novel high voltage line CT electricity taking device |
| CN203632348U (en) * | 2013-12-04 | 2014-06-04 | 国家电网公司 | High-voltage end energy supply system |
| GB2508843A (en) * | 2012-12-12 | 2014-06-18 | Univ Manchester | A current transformer for measuring current in a conductor |
| CN103872792A (en) * | 2014-02-24 | 2014-06-18 | 北京中凯科电电力技术有限公司 | Current transformer online powering device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09148968A (en) * | 1995-11-21 | 1997-06-06 | Takaoka Electric Mfg Co Ltd | Carrier signal receiver and transmitter-receiver |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202102869U (en) * | 2011-06-25 | 2012-01-04 | 中国电子科技集团公司第五十八研究所 | Large-current plane transformer |
| GB2508843A (en) * | 2012-12-12 | 2014-06-18 | Univ Manchester | A current transformer for measuring current in a conductor |
| CN103107012A (en) * | 2013-01-04 | 2013-05-15 | 河南科技大学 | Electronic current transformer and on-line energy-receiving device of high-voltage side of electronic current transformer |
| CN203481916U (en) * | 2013-04-15 | 2014-03-12 | 国家电网公司 | Novel high voltage line CT electricity taking device |
| CN203632348U (en) * | 2013-12-04 | 2014-06-04 | 国家电网公司 | High-voltage end energy supply system |
| CN103872792A (en) * | 2014-02-24 | 2014-06-18 | 北京中凯科电电力技术有限公司 | Current transformer online powering device |
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Inventor after: Fu Keqin Inventor after: Chen Hongbo Inventor after: Peng Zutao Inventor after: Luo Jian Inventor after: Yang Sen Inventor before: Chen Hongbo Inventor before: Fu Keqin Inventor before: Luo Jian Inventor before: Yang Sen |
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