CN102290200B - Controllable saturable reactor - Google Patents
Controllable saturable reactor Download PDFInfo
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- CN102290200B CN102290200B CN 201110103058 CN201110103058A CN102290200B CN 102290200 B CN102290200 B CN 102290200B CN 201110103058 CN201110103058 CN 201110103058 CN 201110103058 A CN201110103058 A CN 201110103058A CN 102290200 B CN102290200 B CN 102290200B
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Abstract
The invention relates to the field of power system transmission and transformation, in particular to a controllable saturable reactor. The controllable saturable reactor comprises a controllable saturable reactor core; the controllable saturable reactor core is of a B-shaped structure, of which both sides are symmetric with the central line of the middle of the core as an axis; the sectional areas of both sides of the core are equal, and both sides of the core are formed into closed flux loops with equal sectional areas; a reactance coil (L1) and a direct-current coil (L2) are respectively mounted on one side of the core; a reactance coil (L3) and a direct-current coil (L4) are respectively correspondingly mounted on the other side of the core; the reactance coil (L1) and the reactance coil (L3) have the same structure and turns; the direct-current coil (L2) and the direct-current coil (L4) have the same structure and turns; when direct current flows through the direct-current coils, direct-current flux flows in the closed flux loops formed by both sides of the core, and cannot flow to the middle of the core; when alternating current flows through the reactance coils, alternating-current flux is formed into flux loops between both sides with the reactance coils and the middle of the core, the middle of the core is one section of the alternating-current magnetic circuit, and the other core sections of the alternating-current magnetic circuit are shared by the direct-current flux; and the magnetoresistance of the middle core section is higher than the magnetoresistance of the other sections of the alternating-current magnetic circuit.
Description
Technical field
The present invention relates to electric power system and send the power transformation field, particularly a kind of controllable transducer.
Background technology
Along with the continuous development of electric power system, the continuous rising of generate output, the electric power system short circuit current that causes that is short-circuited is very big.The be short-circuited short circuit current that causes of electric power system is very big to the harm of electric power system.Therefore, reduce short circuit current, can reduce the extent of damage of power equipment when short circuit, improve the stability of electric power system.The method and apparatus of Recent study limiting short-circuit current (also claiming demand limiter) becomes heat subject.
Utilize the saturation characteristic of saturable reactor iron core can constitute demand limiter.On the saturable reactor iron core, increase by one group of dc coil, when electric power system normally moved, DC power supply provided direct current to dc coil, made the iron core degree of depth of saturable reactor saturated.When the iron core degree of depth of saturable reactor was saturated, saturable reactor presented little reactance; The demand limiter that is connected in the transmission line does not influence normal transmission of electricity.When electric power system was short-circuited, control module was cut off the direct current of dc coil, and the iron core of saturable reactor breaks away from saturated; Saturable reactor presents very big reactance.The saturable reactor that is connected in the transmission line provides constraints to short circuit current, reduces short circuit current.
Saturable reactor is the nucleus equipment of saturation reactance type demand limiter, also is the most valuable equipment.The general twoport font saturable reactor that adopts.A kind of magnetic saturation reactor (patent No. 2010105840411); A kind of saturable reactor main body (patent No. 2011100207304); A kind of saturable reactor (patent No. 2011100409541); A kind of low noise saturable reactor (patent No. 2011100409556) has proposed the various saturable reactors that differ from one another respectively.Satisfying volume and the weight that how further to reduce saturable reactor under the performance requirement condition, the price that reduces saturation reactance type demand limiter is one of research direction.
Summary of the invention
The object of the invention is exactly in order to address the above problem; Provide a kind of through suitably reducing the restriction electric current effect of saturation reactance demand limiter; But reduce controllable transducer volume and weight by a relatively large margin; Reduce saturation reactance demand limiter price by a relatively large margin, the more excellent a kind of controllable transducer of cost performance of restriction electric current effect and controllable transducer price.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of controllable transducer, it comprises:
A controllable transducer iron core; The controllable transducer iron core is a day font structure, is axle with middle iron core center line, bilateral symmetry; The sectional area of both sides iron core equates that the both sides iron core constitutes the sealing flux loop that sectional area equates; Reactance coil L1, dc coil L2 wherein are installed respectively on the iron core of a side; Corresponding reactance coil L3, dc coil L4 are installed respectively on the opposite side iron core; Reactance coil L1 and reactance coil L3 structure, the number of turn are identical; Dc coil L2 and dc coil L4 structure, the number of turn are identical;
When dc coil flow through direct current, the direct current flux magnetic flux closed loop that iron core forms in both sides flowed, iron core in the middle of direct current flux can not flow to; When reactance coil flow through alternating current, exchange flux formed flux loop between reactance coil place side iron core and middle iron core, and middle iron core is a section of interchange magnetic circuit, and it is shared to exchange other highway section iron cores of magnetic circuit and direct current flux; The magnetic resistance in middle iron core highway section is greater than the magnetic resistance that exchanges other highway sections of magnetic circuit.
The sectional area of iron core is less than the sectional area sum of both sides iron core in the middle of said; The direct current of dc coil equals zero, and the voltage that applies of reactance coil hour, and middle iron core and both sides iron core are all unsaturated; The direct current of dc coil equals zero, and reactance coil is when applying rated voltage, middle core sataration, but the both sides iron core is unsaturated.
The sectional area of said middle iron core is less than the sectional area sum of both sides iron core, and the sectional area in middle iron core part highway section is by increasing gradually again after diminishing greatly gradually; The voltage that reactance coil applies is during by little increase, and the long-pending less highway section of middle core section is earlier saturated, and is saturated behind the long-pending bigger highway section of middle core section; The direct current of dc coil equals zero, and when the voltage that reactance coil applies increased to rated voltage, middle iron core was all saturated, but the both sides iron core is unsaturated.
The sectional area of said middle iron core is less than the sectional area sum of both sides iron core, and the part in middle iron core highway section is an air gap; The direct current of dc coil equals zero, and the voltage that applies of reactance coil hour, and middle iron core and both sides iron core are all unsaturated; The direct current of dc coil equals zero, and reactance coil is when applying rated voltage, middle core sataration, but the both sides iron core is unsaturated.
The invention has the beneficial effects as follows: use as the tandem type controllable transducer when controllable transducer is series at electric power system; Can reduce controllable transducer volume and weight by a relatively large margin; Reduce saturation reactance demand limiter price by a relatively large margin, the cost performance of restriction electric current effect and controllable transducer price is more excellent.Use as the parallel connection type controllable transducer when controllable transducer is parallel to electric power system, voltage and current waveform distortion are less.
Description of drawings
Fig. 1 representes a kind of controllable transducer structure and connected mode;
Fig. 2 representes controllable transducer the 2nd kind of structure and connected mode;
Fig. 3 representes the 3rd kind of structure of controllable transducer;
Fig. 4 representes the another kind of form of the 3rd kind of structure of controllable transducer;
Fig. 5 representes the 4th kind of structure of controllable transducer;
Wherein, 1. ac terminal I, 2. ac terminal II, 3. dc terminal I, 4. dc terminal II, 5. controllable transducer iron core.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
Embodiment 1:
Controllable transducer structure and connected mode are as shown in Figure 1.It has the controllable transducer iron core 5 of day font, ac terminal I1 and ac terminal II2 polyphone incoming transport transmitting loop (reactance coil L1 and reactance coil L2 form); Device dc terminal I3 and dc terminal II4 polyphone insert direct current power supply loop (dc coil L2 and dc coil L4 form).
Because the end of the same name of reactance coil L1 is connected with the end of the same name of reactance coil L3; One of them ac terminal I1 for the controllable transducer ac circuit; The different name end of reactance coil L1 is connected with the different name end of reactance coil L3, is another ac terminal II2 of controllable transducer ac circuit; Again because reactance coil L1 and reactance coil L3 structure, the number of turn are identical; So; The magnetic flux φ 2 that the alternating current that magnetic flux φ 1 and the reactance coil L2 that the alternating current that flows through at reactance coil L1 produces in iron core flows through produces in iron core; Equal and opposite in direction; Direction all makes progress, exchange flux respectively day type structure both sides iron core upwards, all pass through the middle iron core formation closed-loop path of day font structure.
The different name end of dc coil L2 is connected with the different name end of dc coil L4; The end of the same name of dc coil L2 is one of them dc terminal I3 of controllable transducer DC loop, and the end of the same name of dc coil L4 is the dc terminal II4 of controllable transducer DC loop.Reactance coil L1 produces the power frequency magnetic flux in the controllable transducer iron core, this power frequency magnetic flux produces induced electromotive force at dc coil L2; Reactance coil L3 produces the power frequency magnetic flux in the controllable transducer iron core, this power frequency magnetic flux produces induced electromotive force at dc coil L4; Because dc coil L2 and dc coil L4 structure, the number of turn are identical, it is zero that the power frequency induced electromotive force of dc coil L2 and the power frequency induced electromotive force of dc coil L4 are kept to mutually, and the alternating current of reactance coil L1, reactance coil L3 does not exert an influence to DC loop.When flowing through direct current among dc coil L3, the dc coil L4, upwards one downwards for one of the magnetic flux that dc coil L3, dc coil L4 produce, and iron core forms the magnetic flux closed loop to direct current flux in both sides; When direct current flux made the place core sataration, the iron core column at AC coil place also was saturated simultaneously.
When said two dc coils flow through direct current, the direct current flux magnetic flux closed loop that iron core forms in both sides flowed, iron core in the middle of direct current flux can not flow to; When said two reactance coils flow through alternating current, exchange flux formed flux loop between reactance coil place side iron core and middle iron core, and middle iron core is a section of interchange magnetic circuit, and it is shared to exchange other highway section iron cores of magnetic circuit and direct current flux; Because the sectional area of middle iron core is less than the sectional area sum of both sides iron core, the magnetic resistance in middle iron core highway section is greater than the magnetic resistance that exchanges other highway sections of magnetic circuit.
If the dc coil L2 of controllable transducer, dc coil L4 direct current are zero; Added undertension between ac terminal I1 and the ac terminal II2 is so that during the middle core sataration of day font structure; The controllable transducer iron core breaks away from saturation condition, and the reactance that is connected on reactance coil L1 in the transmitting loop, reactance coil L3 is very big.If the dc coil L2 of controllable transducer, dc coil L4 direct current are zero; Added voltage makes the middle core sataration of day font structure between ac terminal I1 and the ac terminal II2; But when two iron cores of day font structure are unsaturated; Controllable transducer is connected on the reactance coil L1 in the transmitting loop, the reactance of reactance coil L3 reduces, but still bigger.Under design dc coil L2, the null condition of dc coil L4 direct current; When applying rated voltage between ac terminal I1 and the ac terminal II2; The both sides iron core of day font structure is in critical saturation condition; Controllable transducer can obtain certain limiting short-circuit current effect, and the core volume and the weight of less controllable transducer are arranged.
When dc coil L2, the dc coil L4 direct current of controllable transducer are bigger, controllable transducer both sides iron core is in degree of depth saturation condition, and the reactance that is connected on reactance coil L1 in the transmitting loop, reactance coil L3 is very little.Because the core volume and the weight of less controllable transducer, equal direct current flux can make controllable transducer both sides iron core more saturated, and the reactance value of controllable transducer is lower.
Reactance coil L1 is parallelly connected with reactance coil L3, and higher harmonic current can form flow cycle in reactance coil L1 and reactance coil L3, make the voltage waveform of controllable transducer better.It is less that iron core produces dither, and the noise that controllable transducer produces is less.
Reactance coil L1 and the same post of dc coil L2; Reactance coil L3 and the same post of dc coil L4; If between dc terminal I3 and the dc terminal II4 interference alternating voltage is arranged; Will between reactance coil L1 and reactance coil L3, form circulation, force the interference alternating voltage between dc terminal I3 and the dc terminal II4 to descend.Reduced the harm of interference voltage to DC circuit.
When dc coil L2, the dc coil L4 of controllable transducer have direct current, controllable transducer both sides iron core is saturated, but does not have the degree of depth saturated; The alternating current instantaneous value of reactance coil L1 and reactance coil L3 hour, the both sides core sataration, middle iron core is unsaturated; When the alternating current instantaneous value of reactance coil L1 and reactance coil L3 was big, the side iron core in the iron core of both sides got into undersaturated condition, and middle iron core gets into saturation condition; The alternating current instantaneous value of reactance coil L1 and reactance coil L3 changes to greatlyyer from less, and the reactance value linearity is better, and voltage and current waveform distortion are less.Particularly, use as the parallel connection type controllable transducer when controllable transducer is parallel to electric power system, voltage and current waveform distortion are less, and be less, significant to the harmonic wave that electric power system produces.
Embodiment 2:
Fig. 2 representes controllable transducer the 2nd kind of structure and connected mode; The end of the same name of reactance coil L1 is one of them ac terminal I1 of controllable transducer ac circuit; The different name end of reactance coil L1 is connected with the end of the same name of reactance coil L3, and the different name end of reactance coil L3 is another ac terminal II2 of controllable transducer ac circuit.The end of the same name of dc coil L2 is as dc terminal I3, and the different name end of dc coil L2 is connected with the different name end of dc coil L4, and the end of the same name of dc coil L4 is as dc terminal II4.
In order to limit the DC loop overvoltage and to reduce high order harmonic component, can also increase by two short-circuited coils respectively at two lateral columns in structure that Fig. 2 representes and the connected mode, the measure of being adopted like the patent No. 2011100409541 " a kind of saturable reactor ".
Controllable transducer structure that Fig. 2 representes and connected mode also can obtain the effect of embodiment 1.
Embodiment 3:
Fig. 3 and Fig. 4 represent controllable transducer the 3rd kind of structure and connected mode; The magnetic resistance in iron core highway section is greater than the magnetic resistance that exchanges other highway sections of magnetic circuit in the middle of the said controllable transducer, and the sectional area of middle iron core is less than the sectional area sum of both sides iron core, and the sectional area in middle iron core part highway section is by increasing gradually again after diminishing greatly gradually; The voltage that reactance coil applies is during by little increase, and the long-pending less highway section of middle core section is earlier saturated, and is saturated behind the long-pending bigger highway section of middle core section; Because saturated the gradually changing that middle core section is long-pending, electric current and voltage waveform distortion are less, and the harmonic wave of generation is less.The direct current of dc coil equals zero, and when the voltage that reactance coil applies increased to rated voltage, middle iron core was all saturated, but the both sides iron core is unsaturated.
The sectional area in iron core part highway section was by increasing again after diminishing greatly gradually gradually in the middle of Fig. 3 represented, by the realization that is tapered of middle iron core external dimensions; The sectional area in iron core part highway section became big realization by increasing gradually again after diminishing greatly gradually by middle core interior cavity size gradually in the middle of Fig. 4 represented.The method that Fig. 4 representes, when the long-pending less highway section of core section was earlier saturated, leakage field was in the core interior spatial distribution, and the leakage field spatial characteristics is better, and the controllable transducer characteristic is better.
The controllable transducer structure that Fig. 3 and Fig. 4 represent and the connected mode of each coil are identical with embodiment 1, repeat no more.
Embodiment 4:
Fig. 5 representes controllable transducer the 4th kind of structure and connected mode; The magnetic resistance in iron core highway section is greater than the magnetic resistance that exchanges other highway sections of magnetic circuit in the middle of the said controllable transducer, and the sectional area of middle iron core is less than the sectional area sum of both sides iron core, and the part in middle iron core highway section is an air gap; The characteristic of saturable reactor is more near straight line, and electric current and voltage waveform distortion are less, and the harmonic wave of generation is less.The direct current of dc coil equals zero, and the voltage that applies of reactance coil hour, and middle iron core and both sides iron core are all unsaturated; The direct current of dc coil equals zero, and reactance coil is when applying rated voltage, middle core sataration, but the both sides iron core is unsaturated.
The controllable transducer structure that Fig. 5 representes and each coil connected mode are identical with embodiment 1, repeat no more.
Controllable transducer of the present invention can manufacture and design with prior art, can realize fully.Broad prospect of application is arranged.
Claims (3)
1. controllable transducer is characterized in that it comprises:
A controllable transducer iron core; The controllable transducer iron core is a day font structure, is axle with middle iron core center line, bilateral symmetry; The sectional area of both sides iron core equates that the both sides iron core constitutes the sealing flux loop that sectional area equates; Reactance coil L1, dc coil L2 wherein are installed respectively on the iron core of a side; Corresponding reactance coil L3, dc coil L4 are installed respectively on the opposite side iron core; Reactance coil L1 and reactance coil L3 structure, the number of turn are identical; Dc coil L2 and dc coil L4 structure, the number of turn are identical;
When dc coil flow through direct current, the direct current flux magnetic flux closed loop that iron core forms in both sides flowed, iron core in the middle of direct current flux can not flow to; When reactance coil flow through alternating current, exchange flux formed flux loop between reactance coil place side iron core and middle iron core, and middle iron core is a section of interchange magnetic circuit, and it is shared to exchange other highway section iron cores of magnetic circuit and direct current flux; The magnetic resistance in middle iron core highway section is greater than the magnetic resistance that exchanges other highway sections of magnetic circuit;
The sectional area of said middle iron core is less than the sectional area sum of both sides iron core, and the part in middle iron core highway section is an air gap; The direct current of dc coil equals zero, and the voltage that applies of reactance coil hour, and middle iron core and both sides iron core are all unsaturated; The direct current of dc coil equals zero, and reactance coil is when applying rated voltage, middle core sataration, but the both sides iron core is unsaturated.
2. controllable transducer as claimed in claim 1 is characterized in that, the sectional area of said middle iron core is less than the sectional area sum of both sides iron core; The direct current of dc coil equals zero, and the voltage that applies of reactance coil hour, and middle iron core and both sides iron core are all unsaturated; The direct current of dc coil equals zero, and reactance coil is when applying rated voltage, middle core sataration, but the both sides iron core is unsaturated.
3. controllable transducer as claimed in claim 1 is characterized in that, the sectional area of said middle iron core is less than the sectional area sum of both sides iron core, and the sectional area in middle iron core part highway section is by increasing gradually again after diminishing greatly gradually; The voltage that reactance coil applies is during by little increase, and the long-pending less highway section of middle core section is earlier saturated, and is saturated behind the long-pending bigger highway section of middle core section; The direct current of dc coil equals zero, and when the voltage that reactance coil applies increased to rated voltage, middle iron core was all saturated, but the both sides iron core is unsaturated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110103058 CN102290200B (en) | 2011-04-25 | 2011-04-25 | Controllable saturable reactor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110103058 CN102290200B (en) | 2011-04-25 | 2011-04-25 | Controllable saturable reactor |
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| CN102290200A CN102290200A (en) | 2011-12-21 |
| CN102290200B true CN102290200B (en) | 2012-12-26 |
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| CN 201110103058 Expired - Fee Related CN102290200B (en) | 2011-04-25 | 2011-04-25 | Controllable saturable reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102592807B (en) * | 2012-02-09 | 2014-07-16 | 山东大学 | On-load tap switch of saturable reactor with switch characteristics |
| CN104078199B (en) * | 2014-07-23 | 2016-08-31 | 山东大学 | A kind of devices and methods therefor improving direct-curent saturable reactor performance |
| CN105262072B (en) * | 2015-11-20 | 2017-10-03 | 武汉大学 | A kind of hybrid magnetic saturation fault current limiter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100229A (en) * | 1985-01-16 | 1986-07-16 | 海德罗-魁北克公司 | The automatic control variable reactor of band air-gap |
| CN2273072Y (en) * | 1996-07-25 | 1998-01-21 | 魏书庆 | Electro-control earthing arc extinguishing arrangement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5067544B2 (en) * | 2007-09-11 | 2012-11-07 | 住友電気工業株式会社 | Reactor core, manufacturing method thereof, and reactor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86100229A (en) * | 1985-01-16 | 1986-07-16 | 海德罗-魁北克公司 | The automatic control variable reactor of band air-gap |
| CN2273072Y (en) * | 1996-07-25 | 1998-01-21 | 魏书庆 | Electro-control earthing arc extinguishing arrangement |
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