CN202126906U - Magnetic zero sequence filtering device - Google Patents
Magnetic zero sequence filtering device Download PDFInfo
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- CN202126906U CN202126906U CN2011201823898U CN201120182389U CN202126906U CN 202126906 U CN202126906 U CN 202126906U CN 2011201823898 U CN2011201823898 U CN 2011201823898U CN 201120182389 U CN201120182389 U CN 201120182389U CN 202126906 U CN202126906 U CN 202126906U
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Abstract
The utility model discloses a magnetic zero sequence filtering device and belongs to the field of power electronic filtering equipment. In the device, three-phase iron cores of soft magnetic materials are respectively inserted into corresponding holes of an upper iron yoke and a lower iron yoke, the upper iron yoke, the lower iron yoke and the three-phase iron cores are connected closely as a whole, and the angle between the three-phase iron cores is 120 degrees to form a shape of the Chinese character pin in arrangement based on the center of the center circle of the upper iron yoke and the lower iron yoke. A, B and C three-phase coils are respectively sleeved on the three-phase iron cores, and the phase difference of the formed iron core windings of the pin-shaped magnetic track is 120 degrees. Three sections of clamping parts made of channel steel are welded on an outer circle of a circular cover with an upward opening and distributed respectively at an angle of 120 degrees. The clamping parts are tightly pressed with bolts and nuts at both ends of the three-phase iron cores and no air gaps are reserved. The iron core structure of the magnetic zero sequence filtering device is unique, three-phase magnetic circuits are equal, and zero line current is below one third of three-phase current level value. The magnetic zero sequence filtering device adopts sensitive elements, resonance or overcompensation cannot occur, wiring is convenient, maintenance is avoided, and cost is low.
Description
Technical field
The utility model belongs to power electronics filter apparatus field, particularly suppresses three-phase imbalance and triple-frequency harmonics and causes the excessive a kind of magnetic zero sequence filtering device of neutral line current.
Background technology
Along with power electronic technology developing rapidly and extensive use at power domain; Rolling up of non-linear electrical equipment (load), all there is neutral line overcurrent problem in a large number in large-scale sophisticated equipment intensive application places such as commercial office complex, market, bank, stock exchange center, school.Main cause is a large amount of uses of sophisticated equipments such as television set, computer, convertible frequency air-conditioner, microwave oven, various office equipment and mains lighting supply, uninterrupted power supply; Make a large amount of zero-sequence current of generation in the electrical network, though separate unit power is very little, quantity is huge; Make the Zero-pharse harmonic problem serious; Zero-sequence current is mutual superposition on the neutral line, and these equipment all are that single-phase equipment usually makes the neutral line (zero line) overcurrent serious, and some neutral current is the superfacies line current far.
A large amount of three-phase four-wire system modes of connection that adopt in China's town and country power distribution network; Distribution transformer is the Y/Yno wiring, has a lot of single-phase loads, causes that therefore the three-phase imbalance operation and the neutral current of distribution transformer increases; Cause the skew of neutral point current potential; The situation of neutral line current greater than the phase line current occur, the unsymmetrical current in the electrical network can increase the copper loss and the iron loss of circuit and transformer, reduces exerting oneself even can influencing the safe operation of transformer of transformer; Reduce power supply quality, even can influence the precision of electric energy meter and cause metering loss.The operational mode of conventional electric power system is changed, and causes the severe exacerbation of the electrical network quality of power supply.
Triple-frequency harmonics pollutes and mainly is present in the low-voltage network.Electrical network harm is mainly contained: power loss increase, shortened equipment life, ground protection malfunction, distant control function is not normal, electrical network is overheated etc.Harmonic wave can cause electronic device misoperation, capacitor damage, complementary field, neutral line overload and ignition of cable.
The three-phase transformer of present Yyn0 tie lines group; All adopt the day font iron core or port type iron core of three-phase three-column; First side winding and secondary side winding coexist in the line bag; Be enclosed within on day intermediolateral column of font iron core, port type iron core first side winding and secondary side winding can be enclosed within respectively on two posts, intercouple between each winding.Load unbalanced and when neutral line current was arranged, neutral line current was zero-sequence current when secondary side, and at primary side since no mid point lead-out wire so zero-sequence current can't circulate; So zero-sequence current can not ampere-turn equilibrium,, produce excitatory zero-sequence current to unshakable in one's determination; It receives the excitatory impedance Control of zero sequence, and the excitatory impedance of zero sequence is bigger, and zero-sequence current is affected the symmetry of phase voltage; Neutral point can squint, thereby causes the increase of transformer loss.At Chinese patent 200720198531.1; Disclose last lower yoke in " triangular iron core shunt reactor " and be enclosed within respectively on the three-phase stem with three coils of folder clamping respectively, the above lower yoke center circle center of circle is a benchmark, and angle is that 120 ° of directions become Chinese character pin-shaped and are arranged on the lower yoke between the three-phase stem; Upper yoke is pressed on the three-phase stem; The last lower yoke and the three-phase stem stem of this patent are distinct, have air gap between last lower yoke and the three-phase stem, and air gap is to increase magnetic resistance unshakable in one's determination; Thereby cause that neutral point can squint, and causes the increase of transformer loss; The reactor series products is exactly a principle of utilizing magnetic resistance, increases exciting current, and this patent is adjusted inductance value or reactance value with the crack mouth.Do not need air gap in the general transformer, let magnetic resistance diminish as far as possible.
In utility model patent 0124483.0, relate to a kind of used " article " font volume iron core of three-phase distribution transformer that is used for.The volume iron core comprises three identical iron core rings that are triangular arranged; Three stem stems are that two approximate semicircles combine by two iron core rings to assembly, its cross section respectively; And it is closely connected to connect the plane, place; Each semicircle is divided into 6 trapezoid areas and a diamond-shaped area, and the summit in each regional cross section is on same circumference.But also there is air gap between the three-phase stem, increases magnetic resistance unshakable in one's determination, thereby cause that neutral point can squint, and causes the increase of transformer loss.
The utility model content
The purpose of the utility model is to a large amount of three-phase four-wire system modes of connection that adopt in the electrical network; There is a lot of single-phase loads, causes that therefore the three-phase imbalance operation and the neutral current of distribution transformer increases, cause the skew of neutral point current potential; The situation of neutral line current greater than the phase line current appears; Unsymmetrical current in the electrical network can increase the copper loss and the iron loss of circuit and transformer, reduces exerting oneself even can influencing the safe operation of transformer of transformer, reduces power supply quality; The operational mode of conventional electric power system is changed, and causes the severe exacerbation of the electrical network quality of power supply; And triple-frequency harmonics pollutes electrical network is caused power loss increase, shortened equipment life, ground protection malfunction, distant control function is not normal, electrical network is overheated deficiency; And a kind of magnetic zero sequence filtering device is provided; It is characterized in that the tri-phase iron core of soft magnetic material inserts respectively in the corresponding hole of lower yoke, last lower yoke and tri-phase iron core closely link into an integrated entity; The above lower yoke center circle center of circle is a benchmark, and angle is 120 ° of Chinese character pin-shaped layouts of formation between the tri-phase iron core; A, B, C three-phase coil are enclosed within respectively on the tri-phase iron core, and the iron core winding of " article " font magnetic track of formation differs 120 °; On the dome cylindrical that opening makes progress, become 120 ° of three sections channel-section steels of welding that distribute to process holder, holder is pressed in the tri-phase iron core two ends and compresses with bolt and nut.
Said tri-phase iron core is a silicon steel sheet, the hole through upper and lower iron yoke respectively, and alternately to inserting in the coil rack, or monolithic silicon steel sheet links into an integrated entity respectively with upper and lower iron yoke, alternately to slotting; Compress with bolt and nut, do not stay air gap.
In the said tri-phase iron core transverse shape of a phase iron core be similar to round, be the axial symmetry stairstepping of axle with the center line.
It is at the holder center one that said holder uses the hold-down bolt nut, and three sections channel-section steel terminations are respectively with one.
Every phase coil of said A, B, C three-phase coil is divided into independently two groups of coils; First group of coil head end of each phase respectively with the A of transformer, B, C three-phase be linked together; Second group of coil head end links together and is " E " end; Then " E " was connected on the zero point of transformer; Second group of coil end of first of the A phase group of coil end and B phase is connected then, and first group of coil end of B phase and second group of coil end of C phase are connected, and first group of coil end of C phase and second group of coil end of A phase are connected.
The beneficial effect of the utility model to be (1) the present invention be passive filtering, the coupling through inductance and electric capacity gives certain subharmonic current formation a low resistance state path to certain subharmonic parallel connection low-resistance (tuning filtering) state.Harmonic current just can not flow into system like this.The advantage of passive filtering is that cost is low, and is stable, and technology is ripe relatively, and capacity is big.(2) the present invention has following characteristics:
1) three-phase yoke and post iron are communicated as one
2) three-phase post iron is 120 ° of symmetrical structures, does not cause harmonic wave;
3) because core structure is unique, three-phase magnetic circuit equates that neutral line current is below 1/3 of three-phase electricity levelling value;
4) easy-to-connect, non-maintaining, cost is low.
What 5) the present invention used is inductive element, resonance can not occur and cross the benefit phenomenon.
Description of drawings
Fig. 1 is a magnetic zero sequence filter structural representation.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the end view of the iron core of " article " font magnetic track.
Fig. 4 is A, B, the C three-phase coil wiring schematic diagram of magnetic zero sequence filter.
Fig. 5 is a magnetic zero sequence filter instrument panel sketch map.
Fig. 6 is the harmonic wave state comparison diagram that is superimposed upon on the neutral line, and wherein a is former N phase-harmonic wave state diagram, and B is for adding magnetic zero sequence filter N phase-harmonic wave state diagram.
Embodiment
The present invention provides a kind of magnetic zero sequence filter.The magnetic zero sequence filter is that an iron core winding that has soft magnetic material to constitute " article " font magnetic track differs 120 ° passive filter.
The magnetic filter device of magnetic harmonic wave control is meant and adopts the soft magnetic material manufacturing, utilizes electromagnetic principle and phase shift technology, is used for the device of filtering harmonic.Adopt international state-of-the-art phase shift technology and magnetic circuit symmetric design, but short circuit and counteracting 2-60 subharmonic reach harmonic carcellation, reduce zero-sequence current, adjust three-phase equilibrium, the purpose of the purification quality of power supply, protection power consumption equipment.Improve power factor simultaneously, and do not have the benefit phenomenon.Traditional passive filtering and active power filtering technology all are directly to study circuit; The magnetic field filtering technique then is research magnetic field, solves the new technology of circuit problem through changing magnetic field.
Magnetic filter device iron core is Chinese character pin-shaped structure, magnetic circuit symmetry, but short circuit 3 times and multiple subharmonic.Adopt international state-of-the-art phase shift harmonic wave control technology, confirm that the coiling of winding connects, when making harmonic wave flow into the magnetic filter device, the magnetic field that harmonic wave produces offsets in magnetic filter device inside, reaches the purpose of harmonic carcellation.Below in conjunction with accompanying drawing and embodiment the present invention is explained.
As shown in Figure 1; Soft magnetic material (silicon steel sheet) tri-phase iron core is A phase iron core 5, B phase iron core 11 an and C iron core 7 mutually; They respectively through on the upper yoke 1, lower yoke 9 with the hole of iron core respective shapes; To in the skeleton that inserts A phase coil 6, B phase coil 10 and C phase coil 8, A phase coil 6, B phase coil 10 and C phase coil 8 are enclosed within on the tri-phase iron core respectively, and A phase iron core, B phase iron core and C phase iron core closely link into an integrated entity with upper yoke 1, lower yoke 9 alternately; Or monolithic silicon steel sheet and upper and lower iron yoke link into an integrated entity respectively, alternately to inserting.The above lower yoke center circle of the tri-phase iron core center of circle is a benchmark, and angle is 120 ° of Chinese character pin-shaped layouts of formation between the tri-phase iron core, and the iron core winding of " article " font magnetic track of formation differs 120 °; On the cylindrical of the dome 4 that opening makes progress, become 120 ° of three sections channel-section steels of welding that distribute then, promptly process holder 2, holder 2 is pressed in the tri-phase iron core two ends and compresses with bolt and nut 3, does not stay air gap.Used hold-down bolt nut 3 is included in one at holder 2 centers, and three sections channel-section steel terminations are respectively with one (as shown in Figure 2).
In the said tri-phase iron core transverse shape of a phase iron core be similar to round, be the axial symmetry stairstepping (as shown in Figure 3) of axle with the center line.
Every phase coil of said A, B, C three-phase coil is divided into independently two groups of coils; First group of coil head end of each phase respectively with the A of transformer, B, C three-phase be linked together; Second group of coil head end links together and is " E " end; Then " E " was connected on the zero point of transformer; Second group of coil end of first of the A phase group of coil end and B phase is connected then, and first group of coil end of B phase and second group of coil end of C phase are connected, and first group of coil end of C phase and second group of coil end of A phase are connected; Make with angle of corresponding stem stem fundamental flux phase shift time-harmonic wave electric current corresponding counteracting in magnetic track whereby.Reduce the three-phase imbalance electric current simultaneously, purified zero line voltage to earth harmonic electric current (as shown in Figure 4).In the three-phase and four-line electric power system, triple-frequency harmonics and three-phase imbalance all can cause harmonic current, and triple harmonic current is superimposed upon on the neutral line, and neutral current is " Zero-pharse harmonic electric current ".Can close a floodgate after connecting according to above each point and put into operation, this moment, IA, IB, IC were transformer three-phase output current, were the transformer load electric current.IE is a neutral line current, and magnetic zero sequence filter instrument panel sketch map as shown in Figure 5 shows that this moment, neutral line current IE should be IA, IB, below 1/3 of IC three-phase current mean value.Therefore administer three-phase imbalance, triple-frequency harmonics and neutral line current big aspect have best energy-saving effect; The contrast effect test reaches shown in Figure 6 shown in table 1, table 2, table 3.
The former test data of table 1
Table 2 adds magnetic zero sequence filter test data
Table 3 is each estimation result of economizing on electricity mutually compile
| Title | The A phase | The B phase | The C phase | The N line |
| The total containing ratio of harmonic current has reduced (THDi%) | 3.6 | 2.8 | 7.4 | 0.6 |
| 3 subharmonic currents have reduced (A) | 3.4 | 6.2 | 6.7 | 15.95 |
| 3 subharmonic account for first-harmonic percentage and have reduced (%r) | 6.1 | 5.4 | 8.6 | 14.8 |
| Phase current power saving rate (%) | 16.3 about | 18.8 about | 10.5 about | |
| Neutral line current reduced rate (%) | 64.3 about |
Claims (5)
1. magnetic zero sequence filtering device; It is characterized in that; The tri-phase iron core of soft magnetic material inserts respectively in the corresponding hole of lower yoke; Last lower yoke and tri-phase iron core closely link into an integrated entity, and the above lower yoke center circle center of circle is a benchmark, and angle is 120 ° of Chinese character pin-shaped layouts of formation between the tri-phase iron core; A, B, C three-phase coil are enclosed within respectively on the tri-phase iron core, and the iron core winding of " article " font magnetic track of formation differs 120 °; On the dome cylindrical that opening makes progress, become 120 ° of three sections channel-section steels of welding that distribute to process holder, holder is pressed in the tri-phase iron core two ends and compresses with bolt and nut.
2. according to the said magnetic zero sequence filtering of claim 1 device, it is characterized in that said tri-phase iron core is a silicon steel sheet, through the hole of upper and lower iron yoke, to inserting in the coil rack, compress alternately respectively, do not stay air gap with bolt and nut; Or monolithic silicon steel sheet and upper and lower iron yoke link into an integrated entity respectively, alternately to inserting.
3. according to the said magnetic zero sequence filtering of claim 1 device, it is characterized in that, in the said tri-phase iron core transverse shape of a phase iron core be similar to round, be the axial symmetry stairstepping of axle with the center line.
4. according to the said magnetic zero sequence filter of claim 1, it is characterized in that it be at the holder center one that said holder uses the hold-down bolt nut, three sections channel-section steel terminations are respectively with one.
5. according to the said magnetic zero sequence filtering of claim 1 device; It is characterized in that; Every phase coil of said A, B, C three-phase coil is divided into independently two groups of coils; First group of coil head end of each phase respectively with the A of transformer, B, C three-phase be linked together, second group of coil head end links together to " E " end, then " E " is connected on the zero point of transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201823898U CN202126906U (en) | 2011-06-01 | 2011-06-01 | Magnetic zero sequence filtering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201823898U CN202126906U (en) | 2011-06-01 | 2011-06-01 | Magnetic zero sequence filtering device |
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| Publication Number | Publication Date |
|---|---|
| CN202126906U true CN202126906U (en) | 2012-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011201823898U Expired - Fee Related CN202126906U (en) | 2011-06-01 | 2011-06-01 | Magnetic zero sequence filtering device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360720A (en) * | 2011-06-01 | 2012-02-22 | 北京旺兴达电气设备有限公司 | Magnetic zero sequence filter |
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2011
- 2011-06-01 CN CN2011201823898U patent/CN202126906U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102360720A (en) * | 2011-06-01 | 2012-02-22 | 北京旺兴达电气设备有限公司 | Magnetic zero sequence filter |
| CN102360720B (en) * | 2011-06-01 | 2013-10-16 | 北京旺兴达电气设备有限公司 | Magnetic zero sequence filter |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20141030 Granted publication date: 20120125 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20150430 Granted publication date: 20120125 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120125 Termination date: 20140601 |
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| EXPY | Termination of patent right or utility model |