CN201294382Y - Zero sequence harmonic filtering device for low-pressure system - Google Patents
Zero sequence harmonic filtering device for low-pressure system Download PDFInfo
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- CN201294382Y CN201294382Y CNU2008201237137U CN200820123713U CN201294382Y CN 201294382 Y CN201294382 Y CN 201294382Y CN U2008201237137 U CNU2008201237137 U CN U2008201237137U CN 200820123713 U CN200820123713 U CN 200820123713U CN 201294382 Y CN201294382 Y CN 201294382Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model relates to a low voltage system zero-sequence harmonic filtering device, which belongs to the electrical energy quality control technical field and comprises an iron core (1) and a coil (2), wherein the iron core (1) comprises a core column X1, a core column X2, a core column X3, an upper iron yoke E1 and a lower iron yoke E2, the coil (2) comprises a winding L11, a winding L12, a winding L21, a winding L22, a winding L31 and a winding L32, and two windings with same number of windings are respectively wound on three core columns of the iron core (1) corresponding to three phases A, B and C. The low voltage system zero-sequence harmonic filtering circuit has the advantages that the low voltage system zero-sequence harmonic filtering device does not need a capacitor, mechanical components and electronic control devices, thereby, the low voltage system zero-sequence harmonic filtering device has small volume and low cost, the influence of system parameter changes is small, the problems that harmonic amplification or harmonic resonance and the like can not be generated, the filtering device does not need maintenance, the overloading ability is strong, and the reliability is high.
Description
Technical field
The utility model belongs to power quality control technology field, and a kind of low-pressure system Zero-pharse harmonic filtering device particularly is provided.
Background technology
In low-voltage distribution system, the three-phase four-wire power supply mode is topmost supply power mode, is used widely in industry spot and civil buildings.Along with the modernization in city, a large amount of large-scale commercial building and office building have appearred, in these buildings, exist electric equipments such as a large amount of personal computers, business automation equipment, convertible frequency air-conditioner, mains lighting supply and uninterrupted power supply.These equipment all can produce a large amount of Zero-pharse harmonic electric currents in electrical network, even their separate unit power is less, but huge because of its sum, the harmonic pollution that is brought is extremely serious.Zero-pharse harmonic electric current (mainly being 3 subharmonic currents) mutual superposition on center line makes that the harmonic wave situation in the current in middle wire is serious unusually.The design load that the center line harmonic current makes current in middle wire substantially exceed it on the one hand causes the center line fault; Make that on the other hand common transformer is overheated, accelerate ageing of insulation, potential faults is increased greatly.Also can cause the center line potential to ground to raise simultaneously, can cause the neutral line to blow when serious, cause that three-phase voltage is seriously asymmetric, may cause the large tracts of land power consumption equipment to damage.Zero-pharse harmonic also makes the element in the utility network produce supplementary load loss in addition, has reduced the efficiency of power-driven equipment, and 3 a large amount of subharmonic can cause the long-term overheated even breaking out of fire of circuit when flowing through the neutral line.
For the neutral harmonic electric current in the inhibition system, all there is deficiency in the main at present passive and active power filtering mode that adopts.The harmonic characterisitic of passive filter is subjected to influence on system parameters big; Transship easily; Capacitor parameters changes easily along with medium is aging, the off resonance phenomenon occurs, reduces filter effect; Effective high material consumption, volume is bigger.Along with the continuous development of power electronic technology, the research of active filter is used and is subjected to people's attention.But active filter has limited its extensive use in the problem that exists aspect cost, reliability, the overload capacity.
A kind of low-voltage network neutral harmonic restraining device that the utility model proposes, outside having kept passive filter small investment, efficient height, advantage such as simple in structure, reliable and easy to maintenance, also overcome its many shortcomings, be not subjected to electrical network parameter to influence, other harmonic waves are not produced amplification, do not have off resonance problem etc. as filtering characteristic; Compare with active filter, with low cost, reliable operation, overload capacity are strong.Simultaneously, can realize the low impedance path of fundamental wave zero sequence, the serious imbalance that single-phase load is caused has tangible load balance effect.Therefore, a kind of low-voltage network neutral harmonic restraining device that the utility model proposes demonstrates significant technological merit, has huge using value and market prospects aspect the inhibition of low-voltage network neutral harmonic.
The utility model content
The purpose of this utility model is to provide a kind of low-pressure system Zero-pharse harmonic filtering device, the Zero-pharse harmonic that produces for the nonlinear-load in the low-voltage network provides a low impedance path, the Zero-pharse harmonic electric current is flowed between filter and load, rather than flow back to system through center line.Described a kind of low-voltage network neutral harmonic restraining device has desirable combination property based on the tortuous phase shift of transformer and the inhibition of flux compensation technology realization Zero-pharse harmonic.
A kind of low-voltage network neutral harmonic restraining device schematic diagram that the utility model provides is made of iron core 1 and coil 2 two parts as shown in Figure 1.Iron core 1 leans on X3 by stem stem X1, stem stem X2, core and upper yoke E1, lower yoke E2 constitute; Coil 2 is made of winding L 11, L12, L21, L22, L31, L32.
As shown in Figure 1, be wound with two identical windings of the number of turn respectively on three stem stems of iron core 1 corresponding to A, B, C three-phase, A, B, C three-phase stem stem are represented by X1, X2, X3 respectively.Be wound with two windings of L11 and L12 on the X1; Be wound with two windings of L21 and L22 on the X2; Be wound with two windings of L31 and L32 on the X3.The L11 head end is connected with the A of system, and end links to each other with L22 is terminal; The L21 head end is connected with the B of system, and end links to each other with L32 is terminal; The L31 head end is connected with the C of system, and end links to each other with L12 is terminal; The head end of L12, L22, L32 connects together the back and is connected with the neutral line N of system.
Because six umber of turns of coil 2 equate, the structure unanimity, after connecting according to the method described above, the zero sequence magnetic flux is cancelled out each other, electric current to zero sequence character shows as leakage reactance, for the harmonic wave of zero sequence character provides low impedance path, thereby the harmonic current of zero sequence character is flowed between low-voltage network neutral harmonic restraining device and nonlinear load, do not flow into system, realize the inhibition effect of neutral harmonic.
The structure of iron core 1 as shown in Figure 2, by three in the space symmetry fully, stem stem X1, the X2 that angle, locus mutual deviation is 120 ° and X3 constitute, the iron yoke be a circle, is made of upper yoke E1 and lower yoke E2.Because three stem stems are symmetry fully in the space, thus three-phase magnetic circuit to distribute be uniformly, it is best that the compensation effect of zero sequence magnetic flux reaches, and realizes the filtering of neutral harmonic effectively.
Advantage of the present utility model is: because low-voltage network zero sequence filtering device do not need capacitor, machine components and control electronics, therefore, it is little to have a volume, and cost is low, and it is little influenced by system parameter variations; Can not cause problems such as harmonic wave amplification or harmonic resonance; Non-maintaining, overload capacity is strong, the reliability height.
Description of drawings
(please with among Fig. 3 look remove)
A kind of low-voltage network neutral harmonic restraining device schematic diagram that Fig. 1 provides for the utility model.Constitute by iron core 1 and coil 2 two parts.Iron core 1 leans on X3 by stem stem X1, stem stem X2, core and upper yoke E1, lower yoke E2 constitute; Coil 2 is made of winding L 11, L12, L21, L22, L31, L32.
A kind of low-voltage network neutral harmonic restraining device core structure figure that Fig. 2 provides for the utility model.By three in the space symmetry fully, stem stem X1, the X2 that angle, locus mutual deviation is 120 ° and X3 constitute, the iron yoke be a circle, is made of upper yoke E1 and lower yoke E2.
A kind of low-voltage network neutral harmonic restraining device core structure end view that Fig. 3 provides for the utility model.
Embodiment
A kind of low-voltage network neutral harmonic restraining device schematic diagram that the utility model provides is made of iron core 1 and coil 2 two parts as shown in Figure 1.Iron core 1 leans on X3 by stem stem X1, stem stem X2, core and upper yoke E1, lower yoke E2 constitute; Coil 2 is made of winding L 11, L12, L21, L22, L31, L32.
As shown in Figure 1, be wound with two identical windings of the number of turn respectively on three stem stems of iron core 1 corresponding to A, B, C three-phase, A, B, C three-phase stem stem are represented by X1, X2, X3 respectively.Be wound with two windings of L11 and L12 on the X1; Be wound with two windings of L21 and L22 on the X2; Be wound with two windings of L31 and L32 on the X3.The L11 head end is connected with the A of system, and end links to each other with L22 is terminal; The L21 head end is connected with the B of system, and end links to each other with L32 is terminal; The L31 head end is connected with the C of system, and end links to each other with L12 is terminal; The head end of L12, L22, L32 connects together the back and is connected with the neutral line N of system.The structure of iron core 1 as shown in Figure 2, by three in the space symmetry fully, stem stem X1, the X2 that angle, locus mutual deviation is 120 ° and X3 constitute, the iron yoke be a circle, is made of upper yoke E1 and lower yoke E2.
Claims (3)
1, low-pressure system Zero-pharse harmonic filtering device is characterized in that: comprise iron core (1) and coil (2) two parts; Iron core (1) leans on X3 by stem stem X1, stem stem X2, core and upper yoke E1, lower yoke E2 constitute; Coil (2) is made of winding L 11, L12, L21, L22, L31, L32; Be wound with two identical windings of the number of turn respectively on three stem stems of iron core (1) corresponding to A, B, C three-phase, A, B, C three-phase stem stem are represented by X1, X2, X3 respectively; Be wound with two windings of L11 and L12 on the three-phase stem stem X1; Be wound with two windings of L21 and L22 on the three-phase stem stem X2; Be wound with two windings of L31 and L32 on the three-phase stem stem X3; Winding L 11 head ends are connected with the A of system, end and 22 terminal linking to each other of winding L; Winding L 21 head ends are connected with the B of system, end and 32 terminal linking to each other of winding L; Winding L 31 head ends are connected with the C of system, end and 12 terminal linking to each other of winding L; The head end of winding L 12, L22, L32 connects together the back and is connected with the neutral line N of system.
2, according to the described device of claim 1, it is characterized in that: iron core (1) is symmetrical fully in the space by three, and stem stem X1, X2 that angle, locus mutual deviation is 120 ° and X3 constitute, and the iron yoke is circular, is made of upper yoke E1 and lower yoke E2.
3, according to the described device of claim 1, it is characterized in that: six umber of turns of coil (2) equate, the structure unanimity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201237137U CN201294382Y (en) | 2008-11-12 | 2008-11-12 | Zero sequence harmonic filtering device for low-pressure system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201237137U CN201294382Y (en) | 2008-11-12 | 2008-11-12 | Zero sequence harmonic filtering device for low-pressure system |
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| Publication Number | Publication Date |
|---|---|
| CN201294382Y true CN201294382Y (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201237137U Expired - Fee Related CN201294382Y (en) | 2008-11-12 | 2008-11-12 | Zero sequence harmonic filtering device for low-pressure system |
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| Country | Link |
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| CN (1) | CN201294382Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050974A (en) * | 2012-11-23 | 2013-04-17 | 安徽省电力公司阜阳供电公司 | Low-voltage active harmonic control device |
| CN104882257A (en) * | 2015-06-04 | 2015-09-02 | 西北工业大学 | Neutral formed transformer with boosting function |
| CN106469602A (en) * | 2015-08-20 | 2017-03-01 | 艾默生网络能源有限公司 | A kind of magneticss, switching device and electrical equipment |
-
2008
- 2008-11-12 CN CNU2008201237137U patent/CN201294382Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050974A (en) * | 2012-11-23 | 2013-04-17 | 安徽省电力公司阜阳供电公司 | Low-voltage active harmonic control device |
| CN104882257A (en) * | 2015-06-04 | 2015-09-02 | 西北工业大学 | Neutral formed transformer with boosting function |
| CN106469602A (en) * | 2015-08-20 | 2017-03-01 | 艾默生网络能源有限公司 | A kind of magneticss, switching device and electrical equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20091214 |