CN101557109A - Three-phase four-cable power distribution system and method for installing balancer in the system - Google Patents
Three-phase four-cable power distribution system and method for installing balancer in the system Download PDFInfo
- Publication number
- CN101557109A CN101557109A CNA2009100012879A CN200910001287A CN101557109A CN 101557109 A CN101557109 A CN 101557109A CN A2009100012879 A CNA2009100012879 A CN A2009100012879A CN 200910001287 A CN200910001287 A CN 200910001287A CN 101557109 A CN101557109 A CN 101557109A
- Authority
- CN
- China
- Prior art keywords
- circuit
- balancer
- phase
- line
- electric power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The present invention relates to a three-phase four-cable power distribution system and a method for installing a balancer in the system. According to the method for installing the balancer in the three-phase four-cable power distribution system which comprises a three-phase power line and a neutral line, wherein the balancer supplies the unbalanced current flowing over the neutral line back to the three-phase power line. The method comprises the following steps: measuring the neutral line current in the line connecting the balancer; calculating the capacity of the balancer connected with the end of the line according to a maximum current in the neutral line current and a maximum voltage exerted to the line; and connecting the balancer with the calculated capacity to the end of the line.
Description
Technical field
[0001] method that the present invention relates to three-phase and four line distribution systems and in three-phase and four line distribution systems, arrange balancer.
Background technology
[0002] in developing country, three-phase and four-wire system are used as distribution system, supply with three-phase alternating current (AC) electric power by four lines in this three-phase and four-wire system.
[0003] Figure 13 illustrates the example of structure of three-phase and four line distribution systems.
[0004] as shown in figure 13, three-phase and four line distribution systems comprise four circuits, specifically are meant three-phase power line U, V and W and neutral circuit N.
[0005] when being used as, the machine that consumes high relatively electric power (for example loads, motor) time, use three-phase power line U, V and W (phase three-wire three), and the device that consumes low relatively electric power (for example is used as load, lighting apparatus) time, uses one of them (single-phase two wires) of neutral circuit N and three-phase line U, V and W.
[0006] as shown in figure 13, each of three-phase power line U, V and W and neutral circuit N is electrically connected to U mutually, the phase V of three-phase and four line transformers and W and phase N mutually respectively.In addition, three-phase power line U, V and W and neutral circuit N are electrically connected to distribution control panel 10.In Figure 13, r
u, r
v, r
wAnd r
NThe resistor of representing the U of supply line, V and W and neutral circuit N respectively.
[0007] motor M is electrically connected to three-phase power line U, V and the W that connects distribution control panel 10.The lighting apparatus (not shown) is electrically connected to one of them and the neutral circuit N of three-phase power line U, V and W.
[0008] as mentioned above, when impelling motor M work, supply power to motor M by three-phase power line U, V and M.When lighting apparatus is opened, supply power to lighting apparatus by one of three-phase power line U, V and W and neutral circuit N.
[0009] because three-phase and four line distribution systems make the electric power that can have two mutually different values by public distribution system supply, this reveals huge advantage for the system constructing cost statement, and therefore many developing countries use three-phase and four line distribution systems as the system that is used for supply capability.
[0010] still; three-phase and four line distribution systems also have problems; because user's load is connected electrically between each of neutral circuit N and three-phase power line U, V and W; each the load that is applied to three-phase power line U, V and W is often different, causes having the imbalance that is produced on three-phase power line U, V and W.If produce this imbalance, the superfluous electric power of the phase that relatively little load is applied to flows into neutral circuit N as unsymmetrical current, causes the power consumption of wasting.
[0011] therefore, the inventor has proposed three-phase and four line type transformers in the Japanese patent application of publication number 2007-48859, three-phase and four line type transformers can be by turning back to the unsymmetrical current supply unsymmetrical current that three-phase power line U, V and W utilize waste to consume.
[0012] three-phase that is proposed and four line type transformers are as having the R three-phase of supply line, S phase supply line, T phase supply line and neutral circuit and the balancer in the four line low-voltage power distribution circuits mutually.Three-phase and four line type transformers comprise iron core, and this iron core has and comprises that U phase, V are mutually and W three long limits mutually.Have the coil turn and the mutually different first forward winding around of electric winding direction and the first reverse winding around that are equal to each other, and have the coil turn that is equal to each other and the mutually different second forward winding around of electric winding direction and the second reverse winding around around U mutually, V mutually and W long limit winding mutually.Each of the first forward winding around is connected to next end of the first reverse winding around mutually at the one end, thereby form three first absorbing coils, and similarly, each of the second forward winding around is connected to next end of the second reverse winding around mutually at the one end, thereby forms three second absorbing coils.Each of the first reverse winding around is connected to the other end of the last phase second forward winding around at its other end, thereby first and second absorbing coils are connected to each other.First absorbing coil is electrically connected to relevant supply line at its limit end, and second absorbing coil is electrically connected to neutral circuit at its limit end, thereby the unsymmetrical current that causes flowing through neutral circuit is supplied to go back to supply line.
[0013] according to above-mentioned three-phase and four line type transformer, the unsymmetrical current that uncompensated load produces in neutral circuit because first and second absorbing coils absorb, therefore and the unsymmetrical current that absorbs is supplied with go back to supply line, so can effectively utilize the unsymmetrical current of consumption of being wasted over.But, in the distribution system that reality is used, how to arrange that above-mentioned three-phase and four line type transformers are not mentioned.
Summary of the invention
[0014] because above-mentioned problem, the providing of illustrative purpose of the present invention is used for arranging in three-phase and four line distribution systems makes method such as the balancer of above-mentioned balancer and can effectively utilize energy with low cost.
[0015] another illustrative purpose of the present invention provides three-phase and the four line distribution systems that comprise such balancer.
[0016] in first illustrative aspects of the present invention, be provided at the method for arranging balancer in the three-phase that comprises three-phase power circuit and neutral circuit and the circuit in the four line distribution systems, the unsymmetrical current that described balancer will flow through neutral circuit is supplied with back the three-phase power circuit, comprise the neutral circuit electric current that measurement is flowed in the circuit that balancer connected, the two calculates the capacity of the balancer that will be connected to line end according to maximum current in the neutral circuit electric current and the maximum voltage that is applied to circuit, and connects the end of the balancer of the capacity with calculating like this to circuit.
[0017] according to said method, the two calculates the capacity of the balancer that will be connected to line end according to maximum current in the neutral circuit electric current that flows through circuit and the maximum voltage that is applied to circuit, guarantees to pass through the effective feedback unsymmetrical current of balancer.
[0018] described method also comprises measurement at the electric power that comprises a plurality of points from the circuit of the branch line of circuit branch, and connects the circuit that balancer is applied to the maximum power in the measured electric power.
[0019], also can come effective feedback unsymmetrical current by the end that connects the circuit that balancer maximum power in the branch line is applied to even this guarantees that high electric power is applied to branch line.
[0020] described method comprises that also connecting balancer by the switch of opening off and on or closing at interval at the fixed time arrives terminal, open off and at interval at the fixed time or off switch is used to measure the electric power that is applied to the circuit that balancer connects, obtaining the Base day load curve, and calculate the electric power of being saved according to the Base day load curve.
[0021] this guarantees even without obtaining daily load curve, rely on switch relatively to close the Base day load curve of the condition of the condition of (just balancer is connected to circuit) and switch opens (just balancer is not connected to circuit), also can calculate the electric power of being saved.As a result, can confirm to save how much electric power by balancer.
[0022] the preferred time interval is at 5 minutes to 30 minutes and comprise in the scope of the two.
[0023] by setting-up time at interval at 5 minutes to 30 minutes and comprise in the scope of the two, the electric power of can accurate Calculation saving, and the influence of the fluctuation in the power consumption that is not subjected to changing according to time zone by balancer.
[0024] if the time interval be set to less than 5 minutes, then will be too short by the time period of balancer feedback unsymmetrical current, cause the electric power of can not accurate Calculation saving by balancer.If the time interval was set to greater than 30 minutes, owing to calculate many influences of the fluctuation in the power consumption that is subjected to changing according to time zone, the electric power that accurate Calculation is saved by balancer is difficult.
[0025] in second illustrative aspects of the present invention, the three-phase and the four line distribution systems that comprise three-phase power circuit, neutral circuit and balancer are provided, described balancer is used for the unsymmetrical current that flows through neutral circuit is supplied with back the three-phase power circuit, described balancer has according to the maximum current in the neutral circuit electric current that flows through the circuit that balancer connects and is applied to the two capacity of determining of maximum voltage of circuit, and described balancer is connected to the end of circuit.
[0026] preferred, described balancer is connected to the circuit that the maximum power in the electric power of measuring in a plurality of somes places that comprise from the circuit of the branch line of described circuit branch is applied to.
[0027] three-phase and four line distribution systems are designed to also be included in the switch that predetermined time interval is opened off and on or closed, be used to measure the electric power that is applied to the circuit that balancer connects, to obtain the Base day load curve, wherein, balancer is connected to end by switch, and calculates the electric power of saving by balancer according to the Base day load curve.
[0028] the preferred time interval is at 5 minutes to 30 minutes and comprise in the scope of the two.
[0029] for example, balancer can comprise starlike connection transformer in a zigzag.
[0030] the following exemplary advantage of describing according to foregoing invention that method obtained.
[0031] by carrying out following step: measure the neutral circuit electric current that in the circuit that balancer connected, flows, the two calculates the capacity of the balancer of the end that is connected to circuit according to maximum current in the neutral circuit electric current and the maximum voltage that is applied to circuit, with the end of the balancer that is connected capacity to circuit with calculating like this, can best balancer be arranged in three-phase and the four-wire type distribution system, effectively to utilize energy with low cost thus.In addition, the method according to this invention makes and can reduce greenhouse gas emission, guarantees that Clean Development Mechanism (CDM) can be applied to the present invention.
[0032] by carrying out following step: measure at the electric power that comprises a plurality of points from the circuit of the branch line of circuit branch, and connect the circuit that balancer is applied to the maximum power in the electric power of measurement like this, even high electric power is applied to branch line, also can come by the effective feedback unsymmetrical current of balancer by the end that connects the circuit that balancer maximum power in the branch line is applied to.
[0033] by carrying out following step: connect balancer to terminal by the switch of opening off and on or closing at interval at the fixed time, open off and at interval at the fixed time or off switch is used to measure the electric power that is applied to the circuit that balancer connects, to obtain the Base day load curve, and calculate the electric power of being saved according to the Base day load curve, even without obtaining daily load curve, rely on switch relatively to close the Base day load curve of the condition of the condition of (just balancer is connected to circuit) and switch opens (just balancer is not connected to circuit), also can calculate the electric power of being saved.As a result, can confirm to save how much electric power by balancer.
[0034] by setting-up time at interval at 5 minutes to 30 minutes and comprise in the scope of the two, the electric power of can accurate Calculation saving, and the influence of the fluctuation in the power consumption that is not subjected to changing according to time zone by balancer.
[0035] three-phase according to the present invention provides those advantages that provided with the method according to this invention identical advantage with four line distribution systems.
[0036] by the following description referring to accompanying drawing, above and other objects of the present invention and favorable characteristics are with clear, and wherein, similarly Reference numeral is in identical or similar part of institute's drawings attached middle finger generation.
Description of drawings
Fig. 1 is the figure that illustrates according to the structure of the three-phase of exemplary embodiment of the present invention and four line distribution systems;
Fig. 2 illustrates the ampere and the voltage of residing point of watt-hour meter and measurement;
Fig. 3 is the circuit diagram as the starlike connection transformer of zigzag of balancing transformer;
Fig. 4 illustrates the example of daily load curve;
Fig. 5 is illustrated in the apparent electric power saved in the another kind of situation that a kind of situation that balancing transformer not do not use and balancing transformer use and the relation between the power consumption;
Fig. 6 illustrates the position relation in the measurement point;
Fig. 7 illustrates the R phase calculated, S phase, T mutually and each the figure of mean value of N phase current when the balancing transformer at the measurement point A place that is positioned at Fig. 6 is opened and closed;
Fig. 8 illustrates the R phase calculated, S phase, T mutually and each the figure of mean value of N phase voltage when the balancing transformer at the measurement point A place that is positioned at Fig. 6 is opened and closed;
Fig. 9 illustrates the R phase calculated, S phase, T mutually and each the figure of mean value of N phase current when the balancing transformer at the measurement point B place that is positioned at Fig. 6 is opened and closed;
Figure 10 illustrates the R phase calculated, S phase, T mutually and each the figure of mean value of N phase voltage when the balancing transformer at the measurement point B place that is positioned at Fig. 6 is opened and closed;
Figure 11 is the block diagram of emulation testing circuit;
Figure 12 illustrates the result of the performed test of emulation testing circuit shown in Figure 11;
Figure 13 is the figure that the structure of traditional three-phase and four line distribution systems is shown.
Embodiment
[0037] explains according to exemplary embodiment of the present invention below with reference to accompanying drawing.
[0038] Fig. 1 is the figure that illustrates according to the structure of the three-phase of exemplary embodiment of the present invention and four line distribution systems.
[0039] as shown in Figure 1, comprise four circuits, specifically be according to the three-phase and the four line distribution systems of exemplary embodiment of the present invention, three-phase power line U, V and W, neutral circuit N, and the three-phase and the four line type transformers 1 (after this, abbreviating " balancing transformer " as) that are used as balancer.
[0040] balancing transformer 1 best located is in for example main line or branch line.The unsymmetrical current that balancing transformer 1 will flow through neutral circuit N is supplied with back one or more of three-phase power line U, V and W, thereby makes and can effectively utilize energy with low cost.
[0041] balancing transformer 1 can comprise three-phase and four line transformers that for example propose in the Japanese patent application of publication number 2007-48859.
[0042] as shown in Figure 1, each of three-phase power line U, V and W and neutral circuit N is electrically connected to U mutually, the phase V of three-phase and four line transformers and W and phase N mutually respectively.In addition, three-phase power line U, V and W and neutral circuit N are electrically connected to balancing transformer 1.In Fig. 1, r
u, r
v, r
wAnd r
NThe resistor of representing the U of supply line, V and W and neutral circuit N respectively.
[0043] motor M is electrically connected to three-phase power line U, V and W.The lighting apparatus (not shown) is electrically connected to one of them and the neutral circuit N of three-phase power line U, V and W.
[0044] Fig. 2 illustrates the exemplary arrangement of balancing transformer 1.
[0045] as shown in Figure 2, transformer TR is arranged in main line 20, and balancing transformer 1 is positioned at the end of main line 20.More specifically, balancing transformer 1 is electrically connected to main line 20 at the one end, and other end ground connection.
[0046] for example, transformer TR is arranged in transformer station.
[0047] watt-hour meter 2 of four series connection of layout between transformer TR and balancing transformer 1.
[0048] electric power is supplied to user 22 from main line 20.Watt-hour meter WHM is disposed between main line 20 and each user 22.
[0049] voltage in the main line 20 at mid point 24 places between transformer TR and balancing transformer 1 is minimum.
[0050] though balancing transformer 1 is positioned the end of main line 20, if apply maximum power in certain branch line, then balancing transformer 1 is electrically connected to the end replacement main line 20 of branch line.
[0051] the following process of unsymmetrical current being supplied with go back to supply line by balancing transformer 1 of explaining.
[0052] as previously mentioned, inevitably generation is load unbalanced to a certain extent in three-phase and four line electric power systems.Load unbalanced high more, then voltage drop and line loss are high more.But, because most of voltage drop and line loss is created in the neutral circuit mutually because of zero, can be so zero load unbalanced to remove by deleting by balancing transformer 1.
[0053] for example, the balancing transformer in the exemplary embodiment 1 comprises the starlike connection transformer of zigzag shown in Fig. 3.
[0054] in the starlike connection transformer of zigzag, owing to offset each other at each branch road place of iron core, then do not produce zero phase magnetic flux, and therefore zero phase of impedance is quite little by the magnetomotive force of Zero-phase current initiation.In the starlike connection transformer of zigzag, the zero phase component ground connection in the terminal voltage, and the Zero-phase current that therefore is equal to each other flows through each phase.The result is that starlike connection transformer is used as balancer in a zigzag.
[0055] reactance of the equalizer circuit of the impedance of the impedance of secondary winding, balancer and the transformer TR shown in Fig. 2 (for example transformer TR is in transformer station) is left in the basket owing to it is little.Use is from the electric current I of balancing transformer 1
B(balancer current) offsets the line resistance R of each phase
LLine resistance R with neutral circuit
n, and therefore limit the electric power P ' that is saved according to formula (1).
P’＝3R
L×(I
B)
2+Rn×(3I
B)
2----(1)
Offset the balancer current I of the Zero-phase current of each phase
BLimit according to formula (2).
I
B＝[(Z
T+Z
L+3Z
n)×I
n]/[3(Z
T+Z
L+3Z
n)+3(Z
B+Z
L′+3Z
n′)]----(2)
Herein, Z
T: the impedance of transformer,
Z
L: the impedance of low-voltage supply line,
Z
n: the impedance of neutral circuit,
Z
B: the impedance of balancer,
Z
L ': connect the impedance of the circuit of balancer by it,
Z
N ': connect balancer to the impedance of the connection line of neutral circuit and
I
n: Zero-phase current.
If Z
B, Z
L 'And Z
N 'For insignificant little, balancer current IB can be by following qualification.
I
B＝1/3×(I
n)
[0056] therefore, flow through the neutral circuit electric current (Zero-phase current In) of the circuit that balancing transformer 1 connects and the maximum current surveyed by using in the neutral circuit electric current comes calculated capacity with maximum voltage in the voltage that is applied to circuit according to formula (3) by measurement, then can limit the capacity C of balanced voltage device 1.
C＝Imax×Vmax---(3)
Herein, C: the capacity of balancing transformer 1,
I
Max: the maximum current in the neutral circuit electric current and
V
Max: be applied to the maximum voltage in the voltage of circuit.
[0057] when balancing transformer 1 is arranged in circuit, a plurality of watt-hour meters (WHM) 2 that can measure watt hr (WH) or electric energy are arranged in a plurality of points of the circuit that balancing transformer 1 connected.For example, in three-phase shown in Figure 2 and four line distribution systems, watt-hour meter 2 is located immediately at the upstream of balancing transformer 1, is positioned at transformer TR and supplies power to the point of main line 20 and comprise a plurality of points on the main line 20 of intermediate point 24.
[0058] for example, from the commercial available pincers type watt-hour meter (model: 3169) can be used as watt-hour meter 2 of Heki Denki company.Watt-hour meter 2 can measuring voltage, electric current, effective, invalid and surface voltage, effective and invalid watt hr, power factor, frequency and harmonics, and transmits measurement result to the computer (not shown) by the storage card or the communications cable.
[0059] by measuring the capacity that the neutral circuit electric current limits balancing transformer 1 in the above described manner, and the balancing transformer 1 with capacity of qualification like this is connected to the end of the main line 20 in three-phase and the four line distribution systems, as shown in Figure 2.
[0060] can obtain Base day load curve shown in Figure 4 by the switch that opens and closes at interval balancing transformer 1 at the fixed time off and on, to measure the watt hr in the circuit that balancing transformer 1 connected, electric current and each voltage mutually of each phase thus.Measure at least and continue an about week.
[0061] as shown in Figure 4, the Base day load curve comprises when the switch opens of balancing transformer 1, it is the line that indication produced that balancing transformer 1 is drawn watt-hour meter when not working, with when the switch of balancing transformer 1 cuts out, i.e. draw the line that indication produced of watt-hour meter during balancing transformer 1 work.
[0062] for example, the difference according to these two daily load curves goes out the apparent electric power B that is saved by COMPUTER CALCULATION.
[0063] Fig. 5 illustrates a kind of situation of not using balancing transformer 1 and uses the apparent electric power saved in the another kind of situation of balancing transformer 1 and the relation between the power consumption.
[0064] as shown in Figure 5, if do not use balancing transformer 1, the indication of wattmeter means the electric power [1] that the user consumes and the summation of line loss [2].On the other hand, if use balancing transformer 1, the indication of wattmeter means the summation of electric power [1] (because the electric power that voltage compensation consumed increases " A "), line loss [2] and balancer loss [3] that the user consumes.
[0065] comes whole electric power of being saved in the estimating target zone according to the above-mentioned electric power B that saves and a plurality of distribution networks in the target area, and, calculate electric power saving rate (kWH/kWH) by [electric power of being saved (kWH)]/[whole electric power (kWH) that the substation consumes] limit based on from whole electric power (kWH) of substation's supply and the electric power of being saved (kWH).In addition, calculate the electric power of being saved in 1 year, and determine the point that balancing transformer 1 is located according to the electric power of being saved of such calculating based on the electric power summation of being supplied in a year from transformer station.
[0066] measures the electric power of being saved by balancing transformer 1.
[0067] Fig. 6 illustrates the position relation between the measurement point.
[0068] as shown in Figure 6, carry out measurement by connecting watt-hour meter to measurement point A (more specifically the end 60 of supply line, just last electric pole 61 residing positions) and measurement point B (more specifically balancing transformer 1 residing position).Balancing transformer 1 is electrically connected to final electric pole 61 by 8 meters extended lines 62.
[0069] Fig. 7 illustrates the R phase of being calculated when the balancing transformer 1 at the measurement point A place that is positioned at Fig. 6 is opened and closed, the S phase, the figure of the mean value of each of T phase and N phase current, Fig. 8 illustrates the R phase of being calculated when the balancing transformer 1 at the measurement point A place that is positioned at Fig. 6 is opened and closed, the S phase, the figure of the mean value of each of T phase and N phase voltage, Fig. 9 illustrates the R phase of being calculated when the balancing transformer 1 at the measurement point B place that is positioned at Fig. 6 is opened and closed, the S phase, the figure of the mean value of each of T phase and N phase current, Figure 10 illustrates the R phase of being calculated when the balancing transformer 1 at the measurement point B place that is positioned at Fig. 6 is opened and closed, the S phase, the figure of the mean value of each of T phase and N phase voltage.
Be appreciated that when the switch of balancing transformer 1 is closed (CB ON) by Fig. 9 that [0070] R phase, S phase and T phase current are divided and supplied with back to the N phase current in proportion.As a result, as shown in Figure 8, when switch opens (CB OFF) with very uneven mode scope the R phase of 190V in the 270V, S mutually and the T phase voltage closer to each other, and stably rest near the 230V.This means that non-equilibrium state is modified.
[0071] optimum capacity of test balancing transformer 1 residing optimum position and balancing transformer 1.
[0072] according to by using the performed result of experiment of logical operation artificial circuit, know that if the main line size in the distribution system is equal to each other then to be connected to the end of equally distributed load circuit be best to balancing transformer 1.
[0073] Figure 11 is the block diagram of emulation testing circuit.
[0074] by using the circuit shown in Figure 11 to carry out emulation testing, to know the optimum position of balancing transformer 1.
[0075] in Figure 11, balancing transformer 1 is denoted as " B ".
[0076] Figure 12 illustrates the result of the data analysis that has obtained by the execution emulation testing.
[0077] is appreciated that by placing end can maximize the electric power of being saved balancing transformer 1 by Figure 12.
[0078] according to the present invention, the method for arranging of the balancer in the circuit in three-phase and the four line distribution systems is used for saving the electric power and the energy of three-phase and four line distribution systems.
[0079] also is used to save electric power and energy according to three-phase of the present invention and four line distribution systems.
[0080] the application based on and require the priority of the Japanese patent application NO.2008-007888 that submitted on January 17th, 2008, whole disclosure contents of this application, comprise specification, claims, accompanying drawing and summary by reference integral body be included in this.
[0081] though describe the present invention, should be appreciated that the theme that the present invention comprises is not subject to those specific embodiments in conjunction with certain exemplary embodiment.On the contrary, theme of the present invention is intended to comprise all distortion, change and equivalent included in the scope and spirit of following claim.
Claims (9)
1, arrange the method for balancer in a kind of circuit in three-phase that comprises three-phase power circuit and neutral circuit and four line distribution systems, the unsymmetrical current that described balancer will flow through described neutral circuit is supplied with back described three-phase power circuit, comprising:
The neutral circuit electric current that measurement is flowed in the circuit that described balancer connected;
The two calculates the capacity of the described balancer of the end that will be connected to described circuit according to maximum current in the described neutral circuit electric current and the maximum voltage that is applied to described circuit; And
Connect the described end of the described balancer of capacity to described circuit with calculating like this.
2, the method for claim 1 also comprises:
Measurement is at the electric power that comprises a plurality of points from the circuit of the branch line of described circuit branch; And
Connect the circuit that described balancer is applied to the maximum power in the electric power of measurement like this.
3, as claim 1 or 2 described methods, also comprise:
Connect described balancer to described end by the switch of opening off and on or closing at interval at the fixed time;
Open or close described switch off and at described predetermined time interval and be used to measure the electric power that is applied to the described circuit that described balancer connects, to obtain the Base day load curve; And
Calculate the electric power of being saved according to described Base day load curve.
4, method as claimed in claim 3, wherein, the described time interval was at 5 minutes to 30 minutes and comprise in the scope of the two.
5, a kind of three-phase and four line distribution systems comprise:
The three-phase power circuit;
Neutral circuit; With
Balancer, described balancer are used for the unsymmetrical current that flows through described neutral circuit is supplied with back described three-phase power circuit,
Described balancer has according to the maximum current in the neutral circuit electric current that flows through the circuit that described balancer connects and is applied to the two capacity of determining of maximum voltage of described circuit,
Described balancer is connected to the end of described circuit.
6, three-phase as claimed in claim 5 and four line distribution systems, wherein, described balancer is connected to the circuit that comprises that the maximum power in the electric power of measuring in a plurality of somes places from the circuit of the branch line of described circuit branch is applied to.
7, as claim 5 or 6 described three-phases and four line distribution systems, also be included in the switch that predetermined time interval is opened off and on or closed, be used to measure the electric power that is applied to the described circuit that described balancer connects, obtaining the Base day load curve,
Described balancer is connected to described end by described switch,
The electric power of being saved calculates according to described Base day load curve.
8, three-phase as claimed in claim 7 and four line distribution systems, wherein, the described time interval was at 5 minutes to 30 minutes and comprise in the scope of the two.
9, three-phase as claimed in claim 5 and four line distribution systems, wherein, described balancer comprises starlike connection transformer in a zigzag.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008007888 | 2008-01-17 | ||
| JP2008007888 | 2008-01-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101557109A true CN101557109A (en) | 2009-10-14 |
Family
ID=40885280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100012879A Pending CN101557109A (en) | 2008-01-17 | 2009-01-16 | Three-phase four-cable power distribution system and method for installing balancer in the system |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2009090889A1 (en) |
| CN (1) | CN101557109A (en) |
| WO (1) | WO2009090889A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102187541A (en) * | 2008-10-14 | 2011-09-14 | 黑鹰能量产品有限公司 | Electrical energy saving system |
| CN102270533A (en) * | 2010-06-04 | 2011-12-07 | 株式会社洛伦兹 | Electric power receiving equipment |
| CN104145394A (en) * | 2012-02-22 | 2014-11-12 | 施耐德电气美国股份有限公司 | Systems, methods and devices for detecting branch circuit load imbalance |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103683299B (en) * | 2013-12-31 | 2016-08-17 | 温州市图盛科技有限公司 | A kind of distribution transformer branch load monitoring device |
| CN105990841B (en) * | 2015-04-17 | 2018-09-11 | 长沙理工大学 | Resonant current injection type distribution line three-phase imbalance overvoltage inhibiting apparatus |
| US10587119B2 (en) * | 2018-06-27 | 2020-03-10 | Schneider Electric USA, Inc. | Active power filter with adjustable neutral current limit |
| CN113641205B (en) * | 2021-08-18 | 2022-11-04 | 国网北京市电力公司 | Method and device for processing three-phase-to-ground voltage |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102009A (en) * | 1993-10-22 | 1995-04-26 | 松村光也 | Autoformer |
| JPH09186025A (en) * | 1995-12-28 | 1997-07-15 | Yoshiaki Oki | Shunt transformer unit and single phase three wire power supply system |
| JPH1132437A (en) * | 1997-07-08 | 1999-02-02 | Ain:Kk | Three-phase four-wire low voltage distribution system |
| JP2007048859A (en) * | 2005-08-09 | 2007-02-22 | Teiji Toribami | Three-phase four wire system power transformer and three-phase four wire system low voltage power distribution system using same |
| JP2007235014A (en) * | 2006-03-03 | 2007-09-13 | Osami Nasuno | Split balanced winding type transformer and single-phase three-wired power distribution system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3047691U (en) * | 1997-07-08 | 1998-04-24 | 株式会社アイン | Distribution transformer in three-phase four-wire low-voltage distribution circuit |
-
2009
- 2009-01-16 WO PCT/JP2009/000158 patent/WO2009090889A1/en active Application Filing
- 2009-01-16 JP JP2009549993A patent/JPWO2009090889A1/en active Pending
- 2009-01-16 CN CNA2009100012879A patent/CN101557109A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102009A (en) * | 1993-10-22 | 1995-04-26 | 松村光也 | Autoformer |
| JPH09186025A (en) * | 1995-12-28 | 1997-07-15 | Yoshiaki Oki | Shunt transformer unit and single phase three wire power supply system |
| JPH1132437A (en) * | 1997-07-08 | 1999-02-02 | Ain:Kk | Three-phase four-wire low voltage distribution system |
| JP2007048859A (en) * | 2005-08-09 | 2007-02-22 | Teiji Toribami | Three-phase four wire system power transformer and three-phase four wire system low voltage power distribution system using same |
| JP2007235014A (en) * | 2006-03-03 | 2007-09-13 | Osami Nasuno | Split balanced winding type transformer and single-phase three-wired power distribution system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102187541A (en) * | 2008-10-14 | 2011-09-14 | 黑鹰能量产品有限公司 | Electrical energy saving system |
| CN102270533A (en) * | 2010-06-04 | 2011-12-07 | 株式会社洛伦兹 | Electric power receiving equipment |
| CN104145394A (en) * | 2012-02-22 | 2014-11-12 | 施耐德电气美国股份有限公司 | Systems, methods and devices for detecting branch circuit load imbalance |
| CN104145394B (en) * | 2012-02-22 | 2016-04-20 | 施耐德电气美国股份有限公司 | For the unbalanced system of detection branches circuit load, method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009090889A1 (en) | 2009-07-23 |
| JPWO2009090889A1 (en) | 2011-05-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Emanuel | Apparent power definitions for three-phase systems | |
| CN101557109A (en) | Three-phase four-cable power distribution system and method for installing balancer in the system | |
| CN201145737Y (en) | Apparatus for measuring error of current transformer based on parameter measurement | |
| CN101303394B (en) | Device and method for testing hydroelectric generating set electricity generator stator core | |
| CN210323153U (en) | Take device of three-phase four-wire electric energy measurement | |
| CN102611125B (en) | Asymmetry parameter three-phase three-winding transformer phantom and computational methods | |
| CN109283421B (en) | Low-voltage power-on detection test method and device for railway traction substation | |
| CN106461737A (en) | Method of testing a transformer, electrical testing system, short-circuiting circuit and anodizing assembly | |
| CN201222093Y (en) | Test device for hydraulic generator stator core | |
| Yi et al. | Modeling and Design of High-Frequency Magnetic Components with Large Air Gaps for Electric Vehicle Charger Application | |
| CN204495927U (en) | A kind of low and medium voltage distribution network simulation system | |
| CN208638035U (en) | A kind of new distribution net three-phase imbalance self-checking device | |
| Baghzouz et al. | Distortion of PV system-transformer excitation current under low power production | |
| CN107167641A (en) | A kind of portable section metering device | |
| Damnjanovic et al. | The measurement and evaluation of distribution transformer losses under nonlinear loading | |
| CN205959712U (en) | System for to unloaded demagnetization simultaneously of many transformers | |
| CN110244131A (en) | Extra-high voltage high capacitance equipment dielectric loss test device | |
| CN201628736U (en) | Metering box of electric energy meter | |
| CN103116092B (en) | A kind of Intelligent distribution transformer load test method and device | |
| CN215575618U (en) | Electric energy metering equipment verifying attachment that need not load | |
| RU2815674C1 (en) | Method of determining complex value of total technical losses of full power in urban and industrial power supply systems | |
| CN220568854U (en) | On-line intelligent three-phase current transformer load box device | |
| CN107817413A (en) | The method of unshorting Resistance Influence in the experiment of transformer low-voltage short-circuit impedance | |
| CN102508077B (en) | Method for measuring no-load loss of zero phase angle of dual-core phase-shifting transformer | |
| CN208797399U (en) | It is a kind of for adjusting the ammeter box of three-phase imbalance load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: UTP CO., LTD. Free format text: FORMER OWNER: SADATSUGU TORIBAMI Effective date: 20100608 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: TOKYO, JAPAN TO: FUKUOKA, JAPAN |
|
| TA01 | Transfer of patent application right |
Effective date of registration: 20100608 Address after: Fukuoka Applicant after: KK UTP Address before: Tokyo, Japan, Japan Applicant before: Toribami Sadatsugu |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20091014 |