CN201118246Y - Industry dedicated power-saving device - Google Patents
Industry dedicated power-saving device Download PDFInfo
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- CN201118246Y CN201118246Y CNU2007201151019U CN200720115101U CN201118246Y CN 201118246 Y CN201118246 Y CN 201118246Y CN U2007201151019 U CNU2007201151019 U CN U2007201151019U CN 200720115101 U CN200720115101 U CN 200720115101U CN 201118246 Y CN201118246 Y CN 201118246Y
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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
- Y02E40/30—Reactive power compensation
-
- 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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Abstract
The utility model relates to an industrial power saving device, which mainly comprises a main control module, a communication module, an industrial control computer, a phase-shifting control unit, an ACB switch, a filtration control unit and a circuit protection unit; wherein, the industrial control computer is respectively electrically connected with the phase-shifting control unit, the ACB switch, the filtration control unit and the circuit protection unit via the main control module; the device has the connected relation of a phase-shifting balanced system that one circuit of A. B and C phrases is respectively connected with capacitors in series to form a triangular connection, the other circuit is connected with the capacitors in series to form a star connection with a central point connected with an N end. The device has the beneficial effect that compared with the traditional separated compensation-joint compensation method, the phrase-shifting method of the utility model has zero-sequence current considerably fallen to restore the unbalanced system to be balanced. Therefore, comparing the operation and the non-operation of the device, the zero-sequence current considerably falls and the degree of three-phrase voltage unbalance also falls a lot.
Description
Technical field
The utility model relates to the economize on electricity field, mainly is a kind of industrial private section electric installation.
Background technology
The basal conditions of one existing product technology
Existing factory Energy Saving Control utilizes following two kinds of power save modes nothing more than except changing new-type, comparatively energy-conservation equipment:
First kind of common method is to improve power factor, in alternating current circuit, has two kinds by the electrical power of power supply supply load; A kind of is active power, and a kind of is reactive power.Reactive power mainly shows the harmful effect that supplies, the electricity consumption generation is certain:
1, reduces the output of generator active power.
2, reduce power supply capacity defeated, converting equipment.
3, cause the increase of line voltage distribution loss increase and electric energy loss.
4, cause low power factor operation and voltage to descend, the electric equipment capacity is not in full use.
Power department stipulates that the power factor of factory must not be lower than 0.9, otherwise will give the fine of great number for too high reactive power consumption, and improving the power factor method has two kinds, and a kind of is to improve natural power factor, and another kind is that artificial compensation's device is installed.Comparatively commonly the capacitor compensation cabinet that installs additional at the distribution front end can effectively reduce reactive loss by capacitance compensation.
The secondth, on the bigger motor of load variations, install frequency-changing control system additional.By the running speed of real time altering motor, when satisfying technological requirement, reach the purpose of energy savings.
The two background technology narrations the closest with this invention
Current economic work is disposed in Executive Meeting of the State Council over the past two years, emphasize that clearly enterprise should strengthen the working dynamics of energy-saving and emission-reduction conscientiously, formulate and carry out the condition of strictness more at aspects such as energy-saving and environmental protection, non-compliant investment projects of capital assets must not put into operation without exception.Executive Meeting of the State Council makes the products that save energy and resources of electric equipment industry face the great development opportunity to energy conservation and environment protection.
The demand that following technical elements is arranged from the technical standpoint Energy Saving Control:
1, be the power transmission and distribution aspects, in growing the transmission of electricity process of distance, maximum problem is a line loss, causes the loss of the energy as you know.Promptly be to manage more effective conveying electric current in the grid power transmission process, reduce the loss.For instance, be output as 100% even if enter the power supply of enterprise, that may just have only 80% but arrived end-equipment, line loss that Here it is.After improving the electrical network situation by our electric effect system, power supply may that just has 90% last user.Just reduced the line loss in the transmission of electricity process.At present, China's power transmission and transformation line proportion of goods damageds are 7.70%, far above the U.S. 6% and Japan 3.89%.The products such as power transmission and distribution transformer that possess characteristics such as no-load loss is low, pollution is little meet energy-conservation trend, are worthy to be popularized.
2, be pollution control aspects such as harmonic wave and surge, present suitable serious of the electric network pollution of China as you know, like this concerning enterprise, power consumption equipment is worked under such environment for a long time, can reduce the life-span useful life of equipment because of the pollution of power grid environment, enterprise is formed adding of maintenance cost, production is impacted.The energy-conservation energy-saving device that our Jin Landa Science and Technology Ltd. produces is with regard to this problem of the fine processing of energy, and it can improve the environment of electricity consumption, purifies electrical network, the filtering harmonic wave, stablize waveform, and reach by the control device of science more and to increase work efficiency, reduce the effect of energy loss.
3, be to pursue higher power consumption efficiency to contrast developed country, 75% electric energy will use through power electronic technology conversion or control back, and the electric energy that use process conversion of current China or control back only accounts for 30%, does not reach the power application electronic technology far away and carries out energy-conservation effect.Ratio according to 75% calculates will have 25,560 ten thousand kW electric energy to need conversion or control to China in 2010, visible new-type low energy consumption electronic switch, and Development of Power Electronic Technology potentiality such as frequency converter are very huge.
The structure that three present technology exist, the shortcomings and deficiencies of function aspects
Adopted the three-phase four-wire system mode of connection in China's electrical network in a large number, and distribution transformer is the YIYno wiring, has a lot of single-phase loads, so the operation of the three-phase imbalance of distribution transformer is inevitable.Current in middle wire can not surpass 25% of transformer phase, line current when all having stipulated the distribution transformer operation of YIYno wiring in GB GB50052 " for the distribution design specification ", " the transformer operating standard ", and this is that structure by transformer is determined.The increase of current in middle wire can cause the increase of transformer loss, causes the skew of neutral point current potential simultaneously.
The skew of loss that current in middle wire brings and neutral point current potential can bring following influence
1, the transformer loss that brings of current in middle wire
1 additional iron losses
The distribution transformer of YIYno wiring adopts three core limb structures, its primary side non-zero-sequence current, secondary side has zero-sequence current, therefore the zero-sequence current of secondary side is exciting current fully, the zero sequence magnetic flux that produces can not be closed in iron core, need by the oil tank wall closure, thereby heating produces iron loss in annexes such as iron case.
The zero sequence resistance of YIYno wiring transformer is more much bigger than positive sequence resistance, and it is 15 times of positive sequence resistance that the zero sequence resistance of transformer can be surveyed the zero sequence resistance that obtains the 315kVA transformer, so the additional iron losses that zero-sequence current produces is bigger.
The additional copper loss of winding during 2 unbalanced operations
The total losses unit of three phase windings is that kW can be calculated as during the operation of distribution transformer three-phase imbalance
Pn＝(Ia
2+Ib
2+Ic
2)R1×10
-3
Ia, Ib, Ic are the three-phase load electric current in the formula; R1 is the Circuit Fault on Secondary Transformer winding resistance.
Every phase winding electric current is Ia+Ib+Ic/3 during three-phase equilibrium,
Three phase winding total losses are P
F23[(Ia+Ib+Ic)/3]
2R
1* 10
-3
The supplementary load loss that bring during three-phase imbalance are Δ P
f=P
F1-P
F2={ [(Ia-Ib)
2+ (Ia-Ic)
2+ (Ia-Ic)
2]/3}P
1* 10
-3
2, the variation that causes of current in middle wire
Because the transformer primary side of Y/Yno wiring does not have zero-sequence current, secondary side has zero-sequence current, therefore the zero-sequence current of secondary side is exciting current fully, the zero sequence magnetic flux that produces overlaps on the main flux, induce the zero sequence electromotive force, cause the neutral point voltage skew, the phase voltage that load is heavy reduces, and the phase voltage of loading light rises in the following example:
Model is the zero sequence resistance R0=0.122 Ω of SJ, 315kVA, 10kVI0.4kV transformer, zero sequence reactance X0=0.174 Ω, winding resistance R1=0.00849 Ω.
When Ia=100A, Ib=200A, Ic=300A, cos φ a=cos φ b=cos φ c=0.7:
Zero-sequence current: Io=173A;
Zero-sequence current loss power Po=Io
2.Ro=3.65KW;
Additional copper loss Δ P
f=0.17KW;
Total losses power Δ P=P0+ Δ Pf=3.82kW;
1 year internal loss electric weight W=3.82 * 8760KWh=33463KWh;
Neutral point excursion voltage | Eo|=|Io| * | Zo |=36.6V, Zo are zero sequence impedance, Zo=(Ro
2+ X0
2)
1/2=0.212 Ω.
As the above analysis, the variation of YIYno mode of connection generation is very big.The result causes loss that the distribution transformer unbalanced operation brings also than higher.
Summary of the invention
The utility model purpose is the shortcoming that will solve above-mentioned prior art, and a kind of industrial private section electric installation is provided.
The utility model solves the technical scheme that its technical problem adopts: this industrial private section electric installation, comprise mainly that by main control module, communication module, industrial computer, phase shifting control unit, ACB switch, filtering control unit and circuit protection unit industrial computer is electrically connected with phase shifting control unit, ACB switch, filtering control unit and circuit protection unit respectively by main control module; Equilibrium shift system annexation is as follows in this device: the one tunnel is connected in series connection triangular in shape behind the electric capacity respectively in A, B, the C three-phase, is Y-connection behind another road serial connection electric capacity, and central point connects the N end.
Be provided with change over switch between described phase shifting control unit and the load, load is by this change over switch, and one the tunnel is connected with the phase shifting control unit, and another road directly is connected with input.
The utility model patent adopts phase shift multiple-pulse rectifier transformer, and the higher harmonic current that secondary side connects each unit generation is absorbed at the transformer primary side.
The effect that the utility model is useful is: phase-shift compensation method of the present utility model is mended-is total to compensating method with traditional branch and compares, and zero-sequence current descends a lot, makes unbalanced system return to balance substantially.As seen, compare when installing operation and not moving, zero-sequence current descends a lot, and the imbalance of three-phase voltage degree also descends more.
Description of drawings
Fig. 1 is a system configuration schematic diagram of the present utility model;
Fig. 2 is the compensation condenser wiring schematic diagram in the utility model;
Description of reference numerals: ACB switch 1, circuit protection unit 2, filtering control unit 3, phase shifting control unit 4, change over switch 5, load 6, main control module 7, communication module 8, industrial computer 9.
Embodiment
Below in conjunction with accompanying drawing and concrete mode the utility model is described in further detail.
As shown in Figure 1, this industrial private section electric installation, comprise mainly that by main control module 7, communication module 8, industrial computer 9, phase shifting control unit 4, ACB switch 1, filtering control unit 3 and circuit protection unit 2 industrial computer 9 is electrically connected with phase shifting control unit 4, ACB switch 1, filtering control unit 3 and circuit protection unit 2 respectively by main control module 7; Man-machine interface is carried out the setting of functional requirement, and cooperates instrument to show the variation of data such as electric current, voltage, power factor in real time.In real time electric current, voltage are detected and feed back to industrial computer 9 by communication module 8; the software control unit of industrial computer 9 sends instruction; send real-time command by 7 pairs of ACB switches 1 of main control module, adapter transformer, filtering control unit 3, circuit protection unit 2 etc., make equipment advance running according to set point in advance.Be provided with change over switch 5 between described phase shifting control unit 4 and the load 6, load 6 is connected with phase shifting control unit 4 by this change over switch 5, one tunnel, and another road directly is connected with input.
1, microcomputerized control partly
Adopt the voltage of industrial computer real-time tracking electrical network and the variation of load, computational load operation demand, control pressure control part and compensation switching are partly realized automation optimization.
2, intelligent equilibrium shift partly
Under the condition of the normal operation of proof load, voltage optimization to reasonable range, guide current descends in the time of appropriate regulation voltage, iron loss is directly proportional with voltage squared, and copper loss, line loss are directly proportional with current squaring, when the copper loss of user's all kinds of electricity consumption facilities levels off to iron loss, be that power consumption efficiency is the highest this moment, reach power down mode, look the different loads condition, can reach the effect of saving electric energy; At the three-phase imbalance that is bound in the electrical network exist, adopting symmetrical component method is forward-order current, negative-sequence current and zero-sequence current with Current Decomposition, and the electric current of three-phase balanced system has only forward-order current, therefore only need compensation to fall negative-sequence current and zero-sequence current, unbalanced three-phase current just can be transformed into the three-phase current of balance.
Equilibrium shift system in the utility model, electric capacity, the reactance component of employing hardware star angle mixing just connection compensates or significantly reduces zero-sequence current and negative-sequence current, makes system transition become system in a basic balance.Equilibrium shift system annexation is as follows in this device: the one tunnel is connected in series connection triangular in shape behind the electric capacity respectively in A, B, the C three-phase, be Y-connection behind another road serial connection electric capacity, central point connects the N end, and electric capacity is connected across the effect of shifting alternate active power that has between phase line and the phase line.
The common benefit of this system and traditional form and branch are mended example explanation under the contrast advantage:
When supposing distribution transformer A phase current Ia=100A, B phase current Ib=200A, C phase current Ic=300A, power factor Cos θ a=Cos θ b=COS θ c=0.7, zero-sequence current I0=173A.
(1), in the system equilibrium shift system wiring as shown in Figure 2, Ia, Ib, Ic are load current among the figure; Iao, Ibo, Ico are that star connects the compensating element, electric current; Iab, Idc, Ica are corner connection compensating element, electric current.
Obtain following data according to three-phase imbalance-reactive-load compensation method:
Ibo＝140A，Ico＝120A，Ica＝110A，Ibc＝0，Iab＝0，Iao＝0；
A compensates after-current mutually, Iax=Ia+Iab-Ica+Iao, and the Iax=120A power factor is 0.982;
B compensates after-current Ibx+Ib+Ibc-Iab+Ibo mutually, and the Ibx=140A power factor is 0.9998;
C compensates after-current Icx=Ic+Ica-Ibc+Ico mutually, Icx=155A, and power factor is 0.9999;
Compensation back zero-sequence current I0=45A.
(2), conventional power compensation institute adopts altogether and mends-and the reactive power compensator minute mended compensates idle whole compensation for phasor diagram, A phase current Iax=Ia+Iao after compensating, Iax=70A; B phase current Ibx=Ib+Ibo, Ibx=140a; C phase current Icx=Ic+Ico, Icx=210A; Compensation back zero-sequence current I0=120A.
Phase-shift compensation method of the present utility model is mended-is total to compensating method with traditional branch and compares, and zero-sequence current descends a lot, makes unbalanced system return to balance substantially.As seen, compare when installing operation and not moving, zero-sequence current descends a lot, and the imbalance of three-phase voltage degree also descends more.
3, filtering partly
The JLD energy-saving device adopts phase shift multiple-pulse rectifier transformer, and the higher harmonic current that secondary side connects each unit generation is absorbed at the transformer primary side, and primary side is controlled to minimum to the current harmonics of electrical network.
4, adopt safer more advanced electrical switchgear
Aspect switch disconnector, adopt more advanced static passive compensation device SVC, this electric switch is to be the alternative electric switch of solid-state switch of primary element in order to thyristor, realize changing in the mode of control reactor and capacitor fast, continually the admittance of transmission system, have significant industrial energy saving and the effect of improving the quality of power supply.
5, Artificial Control partly
In order to ensure the long-term importance of operation continuously of unit, designed civil power bypass and manual setting system, for avoiding influencing unit safety operation because of the switching of equipment, (Bypass) controlled function is switched in design synchronously, realizes that real steady no disturbance switching can switch to equipment the operation of specific mode or utility grid at any time when the energy-saving device fault.Guarantee the safety of energy-saving device and driven equipment.
In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (3)
1, a kind of industrial private section electric installation, it is characterized in that: comprise mainly that by main control module (7), communication module (8), industrial computer (9), phase shifting control unit (4), ACB switch (1), filtering control unit (3) and circuit protection unit (2) industrial computer (9) is electrically connected with phase shifting control unit (4), ACB switch (1), filtering control unit (3) and circuit protection unit (2) respectively by main control module (7); Equilibrium shift system annexation is as follows in this device: the one tunnel is connected in series connection triangular in shape behind the electric capacity respectively in A, B, the C three-phase, is Y-connection behind another road serial connection electric capacity, and central point connects the N end.
2, industrial private section electric installation according to claim 1, it is characterized in that: be provided with change over switch (5) between described phase shifting control unit (4) and the load (6), load (6) is by this change over switch (5), one the tunnel is connected with phase shifting control unit (4), and another road directly is connected with input.
3, industrial private section electric installation according to claim 1 is characterized in that: phase shifting control unit (4) adopt phase shift multiple-pulse rectifier transformer, and the higher harmonic current that secondary side connects each unit generation is absorbed at the transformer primary side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201151019U CN201118246Y (en) | 2007-09-20 | 2007-09-20 | Industry dedicated power-saving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201151019U CN201118246Y (en) | 2007-09-20 | 2007-09-20 | Industry dedicated power-saving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201118246Y true CN201118246Y (en) | 2008-09-17 |
Family
ID=39992836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201151019U Expired - Fee Related CN201118246Y (en) | 2007-09-20 | 2007-09-20 | Industry dedicated power-saving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201118246Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631341A (en) * | 2018-05-17 | 2018-10-09 | 福建奥通迈胜电力科技有限公司 | Distribution low-voltage side current three-phase imbalance appraisal procedure based on zero-sequence current |
-
2007
- 2007-09-20 CN CNU2007201151019U patent/CN201118246Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631341A (en) * | 2018-05-17 | 2018-10-09 | 福建奥通迈胜电力科技有限公司 | Distribution low-voltage side current three-phase imbalance appraisal procedure based on zero-sequence current |
| CN108631341B (en) * | 2018-05-17 | 2021-12-21 | 福建奥通迈胜电力科技有限公司 | Zero-sequence current-based three-phase unbalance evaluation method for distribution transformer low-voltage side current |
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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: 20080917 Termination date: 20120920 |