CN203690921U - Harmonic current blocking device used for zero line - Google Patents
Harmonic current blocking device used for zero line Download PDFInfo
- Publication number
- CN203690921U CN203690921U CN201320769194.2U CN201320769194U CN203690921U CN 203690921 U CN203690921 U CN 203690921U CN 201320769194 U CN201320769194 U CN 201320769194U CN 203690921 U CN203690921 U CN 203690921U
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- Prior art keywords
- harmonic
- block device
- current
- harmonic current
- blocking device
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- 230000000903 blocking effect Effects 0.000 title abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 abstract description 2
- 230000009977 dual effect Effects 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 230000009466 transformation 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
Abstract
The utility model discloses a harmonic current blocking device used for a zero line. The device comprises a blocking device body, a harmonic wave blocking device disposed in the body, a compensating filter, and an ammeter embedded on the surface of the body. A housing of the blocking device body is a magnetic shielding cover structure, so that anti-interference of the device is enhanced. Through comprehensive integration of the harmonic blocking device and the compensating filter, an objective of restraining harmonic current can be effectively achieved. Through observing the digital ammeter on the surface of the device, current conditions in a present circuit can be effectively determined. The device is simple to install, does not need excessive manual operation, and the device can protect circuits, reduce loss, reduce radiation, and has dual effects of comprehensive energy saving and secure use.
Description
Technical field
The utility model relates to route protection technical field, relates in particular to a kind of harmonic current block device for zero line.
Background technology
Harmonic current is the inevitable outcome of advanced electronic equipment, and harmonic current flows on electric wiring, can cause a lot of harm.The most noticeable harm has three, first is the hidden danger that causes fire, and this is because harmonic current flows on electric wiring, causes that circuit is overheated to be caused; Second is to produce stronger electromagnetic field, causes electromagnetic environment to worsen, and this is because the frequency of harmonic current is higher, when it flows on electric wiring, more easily produces electromagnetic radiation; The 3rd is to waste energy, and harmonic current flows on the line and can produce extra heat, and these heats are all catabiotic, and this just causes limited electric energy to be fully utilized.
Tradition electrical theory is thought, in the time of three-phrase burden balance, the electric current on zero line is zero, but in the electrical load of modern building, has comprised a large amount of rectification circuits, more especially to the Switching Power Supply of bulk loads power supply, one of problem of bringing is thus exactly that zero line produces harmonic current.So not only can produce electromagnetic radiation; waste energy; and electrical construction regulation and stipulation; on zero line, do not allow to install overcurrent protective device, in the time that neutral line current is excessive, while even exceeding phase line current; zero line is overheated at one's discretion; thereby cause aging circuit, and may bring out fire generation, cause major hidden danger to people's the security of the lives and property.
Utility model content
The purpose of this utility model is to provide a kind of harmonic current block device for zero line, its simple installation, and without too much manual operation, can protection circuit, reduce the wastage, reduce radiation, play the double effects of synthesis energy saving and safe handling.
For realizing the technical scheme that the purpose of this utility model adopts be: a kind of harmonic current block device for zero line, comprise block device body, be arranged on intrinsic harmonic wave block device, compensating filter and be embedded in the ammeter of body surface, described block device body housing is magnetic shielding cover structure.
Described harmonic wave block device is LC type three rank high pass filters.
Described compensating filter is Active Power Filter-APF, comprises the current operator circuit and the offset current circuit for generating that connect successively.
Described magnetic shielding cover is the multilayer stamped part of soft iron plate and copper coin.
Modernization electrical load with rectification circuit is equivalent to a current harmonic resource containing high order harmonic component for transformer side, especially caused the generation of zero line harmonic current, this harmonic current presents non-sine, according to the decomposition of fourier series, this rahmonic electric current contains high order harmonic component, and its amplitude and harmonic number are inversely proportional to.According to traditional blocking-up method, install NBF additional, although can make the harmonic components that electric current contains reduce, but also there is certain high order harmonic component, so can not ensure the elimination completely of Harmfulness Caused by Harmonics, so LC filtering is combined with active power filtering, just harmonic carcellation impact substantially.
The utility model, based on filtering principle, has designed the combination unit of active power filtering and passive filtering, makes harmonic wave blocking effect obvious, being provided with of digital ammeter is beneficial to observation and maintenance simultaneously, the introducing of magnetic screen, also makes the antijamming capability of device strengthen, and is worth being widely used and promoting.
Brief description of the drawings
Fig. 1 is schematic appearance of the present utility model.
Fig. 2 is the basic circuit diagram of the utility model harmonic wave block device.
Fig. 3 is principle assumption diagram of the present utility model.
Fig. 4 is Active Power Filter-APF equivalent circuit diagram of the present utility model.
Embodiment
As shown in Figure 1,2,3, 4: a kind of harmonic current block device for zero line, comprise block device body, be arranged on intrinsic harmonic wave block device, compensating filter and be embedded in the ammeter of body surface, after described harmonic wave block device is connected in parallel with compensating filter, connect with ammeter, described block device body housing is magnetic shielding cover structure.
Described harmonic wave block device is LC type three rank high pass filters.
Described compensating filter is Active Power Filter-APF, comprises the current operator circuit and the offset current circuit for generating that connect successively.
Described magnetic shielding cover is the multilayer stamped part of soft iron plate and copper coin.
When the utility model uses, first device is introduced and treated control circuit.For preventing disturbing, can power by independent current source, so that active power filtering needs to be provided.
Introduce using method as an example of elimination zero line harmonic current example below: first zero line is disconnected at the ground wire of transformer terminal, earth point is moved on to power distribution cabinet from transformer, to eliminate zero line offset voltage, then device is connected on zero line or the neutral line.
In the time that zero line harmonic current produces, this harmonic current presents non-sine, the harmonic wave that contains 5,7,11,13,17,19 grades, harmonic current is first by LC type three rank high pass filters, three rank high pass filters used, get C1=3000F, C2=60mF, R=3k Ω, L=50mH, wherein C2 connects with R, and its series arm is in parallel with L, parallel branch is connected with C1 again, by filtering, the low order composition in multiple harmonic is reduced.
Then enter the current operator circuit of Active Power Filter-APF, by the comparison to existing high order harmonic component, calculate the command signal of offset current.What computing circuit adopted is the Harmonic detection based on instantaneous reactive, filters out by the electric current DC component of low pass filter in circuit of flowing through, and draws fundamental current, then deduct fundametal compoment by total current through inverse transformation, can draw compensating signal.
Compensating signal passes through the offset current circuit for generating in Active Power Filter-APF again, thereby produces offset current, offset current with to compensate humorously involve the idle current canceling of Denging, finally make harmonic current be inhibited.What offset current circuit for generating adopted is voltage-type bridge circuit.Offset current is to be acted on inductance and produced by the difference of DC capacitor voltage in circuit and AC supply voltage, and the working condition of circuit is to be determined by the break-make combination of many group switching devices in circuit.
By the comprehensive integration of harmonic wave block device and compensating filter, just can effectively reach harmonic current and suppress object, by the observation of apparatus surface digital ammeter, can make effective judgement to the current conditions in current circuit.
Claims (4)
1. for a harmonic current block device for zero line, it is characterized in that, comprising: block device body, be arranged on intrinsic harmonic wave block device, compensating filter and be embedded in the ammeter of body surface, described block device body housing is magnetic shielding cover structure.
2. harmonic current block device as claimed in claim 1, is characterized in that: described harmonic wave block device is LC type three rank high pass filters.
3. harmonic current block device as claimed in claim 1, is characterized in that: described compensating filter is Active Power Filter-APF, comprises the current operator circuit and the offset current circuit for generating that connect successively.
4. harmonic current block device as claimed in claim 1, is characterized in that: described magnetic shielding cover is the multilayer stamped part of soft iron plate and copper coin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320769194.2U CN203690921U (en) | 2013-11-30 | 2013-11-30 | Harmonic current blocking device used for zero line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320769194.2U CN203690921U (en) | 2013-11-30 | 2013-11-30 | Harmonic current blocking device used for zero line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203690921U true CN203690921U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320769194.2U Expired - Fee Related CN203690921U (en) | 2013-11-30 | 2013-11-30 | Harmonic current blocking device used for zero line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203690921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110837014A (en) * | 2019-11-01 | 2020-02-25 | 国网新疆电力有限公司哈密供电公司 | Detection method and system for judging whether harmonic voltage amplification is caused by grounding |
-
2013
- 2013-11-30 CN CN201320769194.2U patent/CN203690921U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110837014A (en) * | 2019-11-01 | 2020-02-25 | 国网新疆电力有限公司哈密供电公司 | Detection method and system for judging whether harmonic voltage amplification is caused by grounding |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20151130 |
|
| EXPY | Termination of patent right or utility model |