CN2746625Y - Triple harmonic power filter - Google Patents
Triple harmonic power filter Download PDFInfo
- Publication number
- CN2746625Y CN2746625Y CN 200420070910 CN200420070910U CN2746625Y CN 2746625 Y CN2746625 Y CN 2746625Y CN 200420070910 CN200420070910 CN 200420070910 CN 200420070910 U CN200420070910 U CN 200420070910U CN 2746625 Y CN2746625 Y CN 2746625Y
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- CN
- China
- Prior art keywords
- phase
- contactor
- triple
- filtering
- frequency harmonics
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- Expired - Fee Related
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- Supply And Distribution Of Alternating Current (AREA)
- Filters And Equalizers (AREA)
Abstract
The utility model discloses a power filter of triple harmonic, comprising a box body. The inner of the box body is provided with an intelligent controller, an alternating current contactor, a three-phase filtering switch, an L-C filtering loop, and a trap. One end of the three-phase filtering switch connected with a three-phase line switch is connected with one end of the three-phase AC contactor; the other end of the three-phase AC contactor is connected with the capacitor of the three-phase L-C filtering loop; the inductor of the three-phase L-C filtering loop is connected with a load zero line; one end of the trap is connected with the zero line of the power supply, and the other end is connected with the common connecting end of the inductor of the three-phase L-C filtering loop connected with the load zero line. The signal input end of the intelligent controller arranged in the box body is connected with a current mutual inductor, and the output end is connected with the AC contactor. The utility model has the advantages that the power filter of the triple harmonic can stop and limit mutual confounding of the harmonic current among feeders, reduce interference, and raise filtering efficiency.
Description
Technical field
The utility model belongs to a kind of triple-frequency harmonics electric-power filter.
Background technology
Because a large amount of single-phase electronic product that uses in market, modern office building, the residential quarter produces triple-frequency harmonics, and the filter of domestic production at present is not to design at triple-frequency harmonics, can not limit current in middle wire, it is excessive to can't resolve current in middle wire, and triple-frequency harmonics injects public electric wire net and pollutes problem.External imported product such as ABB only adopt center line " wave arrestment " method, and Nokia only adopts LC " filtering " method, and the limitation of use is all arranged, and the price height, is difficult for penetration and promotion.
Summary of the invention
The purpose of this utility model provide a kind of can wave arrestment again can filtering the triple-frequency harmonics electric-power filter.
The purpose of this utility model is achieved in that it is to comprise casing, is provided with intelligent controller, A.C. contactor, three-phase filtered switch, L-C filter circuit, trap in the casing; Three-phase filtered switch one end that is connected with the three-phase line switch is connected with three-phase ac contactor one end respectively, and the three-phase alternating current tentaculum other end is connected with the electric capacity of three-phase L-C filter circuit respectively, and the inductance of three-phase L-C filter circuit is connected to the load zero line; Trap one end connects the zero line of power supply, and its other end is connected with the inductance public connecting end of the three-phase L-C filter circuit that is connected to the load zero line; The intelligent controller signal input part that is provided with in the casing is connected with current transformer, and its output is connected with A.C. contactor.
The utility model is owing to utilize series loop LC impedance triple-frequency harmonics generation resonance to be presented low-impedance characteristics, the filtering triple-frequency harmonics; Utilize center line wave arrestment reactor, stop and limit mixing mutually of harmonic current between each feed line, reduce and disturb, improve filtration efficiency; Utilize intelligent controller that load current value and instruction (adjusting) value that current transformer detects is compared, when the load current value reaches instruction (adjusting) value, connect A.C. contactor, start filter circuit and carry out filtering, export fundamental wave reactive power simultaneously,, disconnect filter circuit when load current during less than command value, owing to adopt intelligent controller, realize the automatic switching function; Because adopt the production domesticization element, cost can be reduced to 1/2 of import like product, and performance is more superior; Owing to adopt the special-purpose reactor of iron core linear filtering, unsaturated, have good linear, thereby improved the stability of filter circuit greatly; Because it is adopt the full membrane filtration ripple of dry type self-healing dedicated capacitor, very favourable to fire prevention, safe operation.Reach following effect through installing and using:
1, can lower harmonic current, filtering rate=60-90% greatly;
2, improved the quality of power supply.The total percent harmonic distortion THD of busbar voltage
U＜5%;
3, avoid the interference of harmonic current, guarantee the weak current equipment reliability service electronic equipment, communication system;
4, improve power factor.COSΦ＞0.91；
5, reduce (distribution) electric current, make full use of the ability to transmit electricity of power supply, controller switching equipment;
6, reduce the energy loss that harmonic current and reactive current cause, save electricity charge spending 8-25%.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment
Embodiment
Present embodiment is to be mounted with intelligent controller 6, A.C. contactor 3, three-phase filtered switch 2, L-C filter circuit, trap 1 in casing.Also be equipped with air discharging facility in the casing, made inner each components and parts keep lower temperature rise, increased the service life, it is more reliable to work.Described casing can be various profiles such as console mode, desk-top, wall built-up.With reference to Fig. 1, three-phase firewire A, the B of power supply, C are connected with three-phase line switch 7 one ends, three-phase line switch 7 other ends are connected with three-phase filtered switch 2 one ends respectively, three-phase filtered switch 2 other ends are connected with three-phase ac contactor 3 one ends, three-phase ac contactor 3 other ends are connected with electric capacity 4 one ends in the three-phase L-C filter circuit respectively, each inductance 5 other end in the three-phase L-C filter circuit are connected to trap 1 one ends, and trap 1 other end is connected on the zero line 0 of power supply; Intelligent controller 6 inputs are connected with current transformer 8, and its output (switching signal) is connected with A.C. contactor 3.Current transformer 8 is to be connected to detection load electric current in the load.Intelligent controller is that the model that adopts is DH or DW (market is on sale).Electric capacity in the circuit is to adopt dry type self-healing filtering dedicated capacitor, to set fire, safe operation is very favourable; Inductance is to adopt the linear iron core reactor that a plurality of air gaps are arranged on its iron core, has the linear unattenuated superperformance of 2-3 times of overload, and noise is little, and temperature rise is low, can guarantee the stable of L-C resonance point, improves filtration efficiency.Operation principle: intelligent controller obtains the load current signal through instrument transformer, when the load current value reaches instruction (adjusting) value, connects A.C. contactor, starts the L-C filter circuit and carries out filtering, exports fundamental wave reactive power simultaneously.When load current during, disconnect L-C series filtering loop less than command value.Because center line installs trap additional, the triple-frequency harmonics that load produces is by the bypass of L-C filter circuit institute own, and limits it and flow out common line.Otherwise common line because the existence of trap also is blocked, can not enter the L-C filter circuit by the harmonic current that other loads produce in a large number, reduces each other and disturbs.
Claims (5)
1, a kind of triple-frequency harmonics electric-power filter, it is to comprise casing, it is characterized in that: be provided with intelligent controller (6), A.C. contactor (3), three-phase filtered switch (2), L-C filter circuit, trap (1) in the described casing; Three-phase filtered switch (2) other end that is connected with three-phase line switch (7) is connected with three-phase ac contactor (3) one ends, three-phase alternating current tentaculum (3) other end is connected with the electric capacity (4) of three-phase L-C filter circuit, and the inductance (5) of three-phase L-C filter circuit is connected to the load zero line; Trap (1) one end connects the zero line (0) of power supply, and its other end is connected with inductance (5) public connecting end of the three-phase L-C filter circuit that is connected to the load zero line; Intelligent controller (6) signal input part that is provided with in the casing is connected with current transformer (8), and its output is connected with A.C. contactor (3).
2, triple-frequency harmonics electric-power filter according to claim 1 is characterized in that: the inductance (5) in the described L-C series filtering loop is to adopt the linear iron core reactor that a plurality of air gaps are arranged on its iron core.
3, triple-frequency harmonics electric-power filter according to claim 1 is characterized in that: the electric capacity (4) in the described L-C series filtering loop is to adopt dry type self-healing filtering capacitor.
4, triple-frequency harmonics electric-power filter according to claim 1 is characterized in that: also be equipped with air discharging facility in the described casing.
5, according to claim 1 or 4 described triple-frequency harmonics electric-power filters, it is characterized in that: described casing can be console mode, desk-top, wall-hanging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420070910 CN2746625Y (en) | 2004-06-28 | 2004-06-28 | Triple harmonic power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420070910 CN2746625Y (en) | 2004-06-28 | 2004-06-28 | Triple harmonic power filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2746625Y true CN2746625Y (en) | 2005-12-14 |
Family
ID=35583202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420070910 Expired - Fee Related CN2746625Y (en) | 2004-06-28 | 2004-06-28 | Triple harmonic power filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2746625Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369730B (en) * | 2007-08-14 | 2012-05-30 | 宋圭昌 | Zero-pharse harmonic reduction device having protection function of overload |
| CN107146698A (en) * | 2017-06-12 | 2017-09-08 | 广东光达电气有限公司 | Series connection neutral line current wave filter and its application in electrical equipment |
-
2004
- 2004-06-28 CN CN 200420070910 patent/CN2746625Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101369730B (en) * | 2007-08-14 | 2012-05-30 | 宋圭昌 | Zero-pharse harmonic reduction device having protection function of overload |
| CN107146698A (en) * | 2017-06-12 | 2017-09-08 | 广东光达电气有限公司 | Series connection neutral line current wave filter and its application in electrical equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |