CN203607851U - Harmonic elimination device capable of limiting unbalanced voltage on secondary side of voltage transformer - Google Patents
Harmonic elimination device capable of limiting unbalanced voltage on secondary side of voltage transformer Download PDFInfo
- Publication number
- CN203607851U CN203607851U CN201320835652.8U CN201320835652U CN203607851U CN 203607851 U CN203607851 U CN 203607851U CN 201320835652 U CN201320835652 U CN 201320835652U CN 203607851 U CN203607851 U CN 203607851U
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- voltage
- harmonic
- voltage transformer
- harmonic elimination
- secondary side
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- 230000008030 elimination Effects 0.000 title claims abstract description 17
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 17
- 230000000670 limiting effect Effects 0.000 title claims abstract description 15
- 238000004804 winding Methods 0.000 claims abstract description 14
- 230000007935 neutral effect Effects 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
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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
-
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- Protection Of Transformers (AREA)
Abstract
The utility model discloses a harmonic elimination device capable of limiting the unbalanced voltage on the secondary side of a voltage transformer. The harmonic elimination device comprises a harmonic elimination resistor installed between a wiring neutral point of a primary winding of the neutral voltage transformer and the ground, and a third harmonic limiting circuit connected with two ends of an open delta of residual windings of the voltage transformer. According to the utility model, two ends of the open delta of the residual windings of the voltage transformer are connected with the third harmonic limiting circuit, so that the harmonic voltage of the voltage transformer is effectively limited, and the conditions caused by the harmonic voltage of the voltage transformer, such as voltage rise of the open delta, three-phase voltage unbalance and increase of neutral point displacement, are effectively treated. In addition, the resonance frequency can be recorded, the zero sequence voltage of the open delta can be displayed, and the intelligent protection is realized.
Description
Technical field
The utility model relates to a kind of harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage.
Background technology
In electric power system, when induction reactance and capacitive reactance parameter matching resonance can occur when appropriate.While there is ferro resonance in electric power system, can there is at inductance and electric capacity two ends overvoltage and overcurrent higher than several times to tens times of rated voltage and rated current, at this moment core sataration, the exciting curent of a certain phase or two-phase is increased considerably, three pole reactor is not etc., will with electrical network relatively electric capacity form resonant tank, the electric current by voltage transformer, much larger than exciting curent, finally burns out voltage transformer and other equipment.Therefore,, in order to prevent ferro resonance, the voltage transformer of on-the-spot operation has all been loaded onto resonance eliminator.Resonance eliminator is high power capacity nonlinear resistor, its damping current limiting effect, and the voltage transformer of star corner connection line generally all can fill resonance eliminator.But voltage transformer is installed after resonance eliminator, can on resonance eliminator resistance, produce voltage drop, be reflected to secondary side residue winding open delta voltage two ends, cause triangle wiring secondary side imbalance of three-phase voltage, third harmonic voltage raises, and the stability of electric power system is caused to serious impact.
Utility model content
For overcoming the existing defect of prior art, the purpose of this utility model is to provide a kind of harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage.
The technical solution adopted in the utility model is:
Harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage, comprising:
Be arranged on the harmonic-eliminating resistor between winding connection neutral point of voltage transformer and ground;
Triple-frequency harmonics limiting circuit, described triple-frequency harmonics limiting circuit comprises PTC thermistor, fuse, described fuse is connected to the two ends of voltage transformer residue winding open delta after connecting with PTC thermistor;
Residual voltage Acquisition Circuit, described residual voltage Acquisition Circuit is connected with the two ends of the open delta of voltage transformer residue winding;
For the cpu system to the data analysis gathering, record, storage, the input of described cpu system is connected with the signal output part of residual voltage Acquisition Circuit;
For the display unit of display analysis result, described display unit is connected with cpu system.
Further, described harmonic elimination apparatus is also provided with RS485 interface, and described RS485 interface is connected with the output of cpu system.
Further, described cpu system comprises single machine unit, memory cell.
The beneficial effects of the utility model are: a kind of harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage that the utility model adopts, open delta two ends at voltage transformer residue winding are connected with triple-frequency harmonics limiting circuit, the situations such as the effectively deboost instrument transformer harmonic voltage open delta voltage rising that also improvement causes due to voltage transformer harmonic voltage, imbalance of three-phase voltage, neutral point displacement increase.Can also record the number of times that resonance occurs, show the residual voltage of open delta, there is intelligent protection simultaneously.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the utility model is described in further detail.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
With reference to Fig. 1, a kind of harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage, comprising:
Be arranged on the harmonic-eliminating resistor R1 between winding connection neutral point N of voltage transformer and ground;
Triple-frequency harmonics limiting circuit, described triple-frequency harmonics limiting circuit comprises PTC thermistor R2, fuse FUSE, described fuse FUSE is connected to the two ends of voltage transformer residue winding open delta after connecting with PTC thermistor R2;
Residual voltage Acquisition Circuit 1, described residual voltage Acquisition Circuit 1 is connected with the two ends of the open delta of voltage transformer residue winding;
For the cpu system 2 to the data analysis gathering, record, storage, the input of described cpu system 2 is connected with the signal output part of residual voltage Acquisition Circuit 1;
For the display unit 3 of display analysis result, described display unit 3 is connected with cpu system 2.
In the present embodiment, after described PTC thermistor R2 series connection fuse FUSE, be connected on the two ends of voltage transformer open delta, PTC thermistor R2 is high resistant (when voltage is 100VAC to high voltage, resistance >2k Ω), low-voltage is to low-resistance (when voltage is 5VAC, resistance <20 Ω), both can effectively limit harmonic wave, again the normal ground signalling of circuit is not had to what impact.In this triple-frequency harmonics limiting circuit string on fuse FUSE, can avoid the short circuit of open delta in any case.But when the abnormal conditions such as single-phase earthing occur, flow through PTC thermistor R2 compared with macro-energy, the heat producing makes its resistance value moment be raised to high resistant, is equivalent to whole triple-frequency harmonics limiting circuit and open delta to disconnect, thus the safety of guarantee triple-frequency harmonics limiting circuit and voltage transformer.
Described residual voltage Acquisition Circuit 1 constantly gathers the residual voltage at open delta two ends, and by the transfer of data of gained to cpu system 2, cpu system 2 comprises single machine unit, memory cell, to the data analysis collecting, number of times the storage of recording resonance, the analysis result of gained shows in display unit 3.
Further, described harmonic elimination apparatus is also provided with RS485 interface 4, described RS485 interface 4 is connected with the output of cpu system 2, and harmonic elimination apparatus is by 4 image data that obtain of RS485 interface and analyze transfer of data to upper level main website, to facilitate main website to pressing change equipment to monitor.
The above, be preferred embodiment of the present utility model, and the utility model is not limited to above-mentioned execution mode, as long as it reaches technique effect of the present utility model with identical means, all should belong to protection range of the present utility model.
Claims (3)
1. a harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage, is characterized in that, comprising:
Be arranged on the harmonic-eliminating resistor between winding connection neutral point of voltage transformer and ground;
Triple-frequency harmonics limiting circuit, described triple-frequency harmonics limiting circuit comprises PTC thermistor, fuse, described fuse is connected to the two ends of voltage transformer residue winding open delta after connecting with PTC thermistor;
Residual voltage Acquisition Circuit, described residual voltage Acquisition Circuit is connected with the two ends of the open delta of voltage transformer residue winding;
For the cpu system to the data analysis gathering, record, storage, the input of described cpu system is connected with the signal output part of voltage collection circuit;
For the display unit of display analysis result, described display unit is connected with cpu system.
2. a kind of harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage according to claim 1, is characterized in that: described harmonic elimination apparatus is also provided with RS485 interface, and described RS485 interface is connected with the output of cpu system.
3. a kind of harmonic elimination apparatus that can deboost instrument transformer secondary side unbalance voltage according to claim 1, is characterized in that: described cpu system comprises single machine unit, memory cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320835652.8U CN203607851U (en) | 2013-12-17 | 2013-12-17 | Harmonic elimination device capable of limiting unbalanced voltage on secondary side of voltage transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320835652.8U CN203607851U (en) | 2013-12-17 | 2013-12-17 | Harmonic elimination device capable of limiting unbalanced voltage on secondary side of voltage transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203607851U true CN203607851U (en) | 2014-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320835652.8U Expired - Lifetime CN203607851U (en) | 2013-12-17 | 2013-12-17 | Harmonic elimination device capable of limiting unbalanced voltage on secondary side of voltage transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203607851U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117424350A (en) * | 2023-12-18 | 2024-01-19 | 安徽凯川电力保护设备有限公司 | Ground connection pulse selection dynamic monitoring controller |
-
2013
- 2013-12-17 CN CN201320835652.8U patent/CN203607851U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117424350A (en) * | 2023-12-18 | 2024-01-19 | 安徽凯川电力保护设备有限公司 | Ground connection pulse selection dynamic monitoring controller |
| CN117424350B (en) * | 2023-12-18 | 2024-04-16 | 安徽凯川电力保护设备有限公司 | Ground connection pulse selection dynamic monitoring controller |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140521 |
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| CX01 | Expiry of patent term |