CN2322300Y - Three-phase voltage-amplitude and phase-balance compensation electricity-saving device - Google Patents

Abstract

The utility model relates to a device for reducing the voltage amplitude value and the phase unbalance in a three-phase AC power supply network. The utility model is composed of a phase shifting controller, compensation electromagnetic couplers, a current mutual inductor and corresponding three-phase AC input and output terminals. The unbalanced state of the power supply network is sent to the control output terminal of the phase shifting controller by the current mutual inductor, the compensation current at the output terminal of the phase shifting controller which is adjusted by a potentiometer can generate the compensation potential overlapped with the input three-phase AC by the compensation electromagnetic couplers WA, WB and WC; thereby, the unbalanced degree of the power supply network is reduced. The utility model can automatically complete compensation according to the magnitude of the unbalanced degree, and has the advantages of simple structure and reliable effect of a control device.

Description

Three-phase voltage amplitude and phase equilibrium expansion joint electric installation

The utility model relate to one we reduce the device of voltage magnitude and unbalance in phase in the three-phase alternating current electric network.

Because pressure drop, the user page of supply line carry the pollution to electrical network of imbalance and nonlinear load, make and the voltage magnitude and the phase imbalance of three phase supply network cause power supply quality to descend.Power supply quality is bad will to bring the serious consequence of waste of energy, electrical appliance damage and precision instrument cisco unity malfunction to the user.

Power department can only be taked to improve way solution line terminal user's voltage problem on the low side that user transformers is paid the limit output voltage at present, and the unbalance control and the adjustment of supply network are not still had effective measures.

The purpose of this utility model provides a kind of above-mentioned unbalance three-phase voltage amplitude and phase equilibrium expansion joint electric installation that power supply quality improves that help that reduce.

Above-mentioned purpose obtains by the following technical programs: housing 1 is provided with three-phase alternating current input terminal Z1-3 and lead-out terminal Z4-6, be fixed with phase-shift controller B φ in the housing, compensation electromagnetic coupling apparatus WA, WB, WC summation current transformer CT1, CT2, CT3, when each AC input terminal Z1-3 connects phase-shift controller B φ input respectively, also connect compensation electromagnetic coupler WA respectively, WB, the secondary winding of WC, be serially connected with current transformer CT1 respectively between each winding other end and the corresponding sub-Z4-6 of ac output end, CT2, the elementary winding of CT3, each secondary winding different name end link to each other and are connected to phase-shift controller B φ control input end; The elementary winding different name end of each compensation electromagnetic coupler WA, WB, WC links to each other and is connected to phase-shift controller B φ output through potentiometer RW.

Tri-phase iron core can be wound with the primary and secondary winding of each compensation electromagnetic coupler WA, WB, WC.

Below with drawings and Examples explanation the utility model.

Accompanying drawing 1, the utility model structure partial generalized section,

Accompanying drawing 2, electrical schematic diagram,

Accompanying drawing 3, balanced compensated polar plot.

Among the figure: 1 housing, 2 ac output end, 3 AC input terminals, 4 phase-shift controller B φ, 5 compensation electromagnetic couplers, 6 current transformers.

Embodiment as shown in Figure 1, it is Z1,2,3 that AC input terminal 3 is set on the housing 1, it is Z4,5,6 that the housing front is provided with ac output end 2, fixedly phase-shift controller B φ (being shown in the number in the figure 4), compensation electromagnetic coupler 5 summation current transformers 6 of layering in the housing.Each parts is annexation and operation principle such as Fig. 2, shown in 3, AC input terminal Z1,2,3 connect phase-shift controller B φ input and compensation electromagnetic coupler WA simultaneously respectively, WB, the secondary winding of WC, this winding is respectively through current transformer CT1, CT2, the elementary winding of CT3 meets the sub-Z4 of corresponding ac output end, 5,6, the elementary winding different name end of each compensation electromagnetic coupling apparatus joins and is connected to the output of phase-shift controller B φ, current transformer CT1 through the potentiometer RW of control compensation size, CT2, after linking to each other, each secondary winding different name end of CT3 is connected to the control input end of phase-shift controller.

This device is installed in user's three-phase air switch rear side, its ac output end connects user load, find out from the balanced compensated polar plot of Fig. 3, when user load is uneven, be displaced to O ' point from the O point former zero point, and at this moment the voltage magnitude of load voltage  a ',  c ' is less than 220V, and the voltage magnitude of  b ' is all greater than 220V, and less than 120 °, the angle of  b ' and  c ' is also less than 120 ° greater than the angle of 120 °,  a ' and  b ' for the angle of  a ' and  c '.Each current transformer of this device detects the three-phase current vector that do not weigh, and the phase shift angle of control phase-shift controller makes it to produce the phase shift electromotive force vector output of one as  k ' direction unanimity among Fig. 3, regulates to produce compensating through potentiometer RW $\stackrel{.}{I}$ Flow through each elementary winding of each compensation electromagnetic coupler WA, WB, WC of k, the number of turn that makes each elementary winding is NK, then magnetic potential Nk $\stackrel{.}{I}$ K produces magnetic flux on iron core: $\stackrel{.}{\mathrm{\φ}}k=\mathrm{Nk}\stackrel{.}{I}k/\mathrm{Rm},$

Rm is the magnetic circuit magnetic resistance in the formula, and is fashionable in the magnetic circuit insatiable hunger, and the magnetic circuit principle of stacking is effective, and this magnetic flux produces induced potential at the secondary winding NK ' of WA, WB, WC and is: $\mathrm{Ek}=4\·44\mathrm{fN}{k}^{\′}\stackrel{.}{\mathrm{\φ}}k=222N{k}^{\′}\mathrm{\φk}$

Nk ' is the secondary winding number of turn in the formula, because of compensating potential  k ≈ $\stackrel{.}{E}$ K so just is superimposed upon compensating potential in the ac main circuit by electromagnetic induction, makes

A=’a+k

B=’b+k

c=’c+k，

The amplitude that can know the electromotive force vector  A that finds out after the compensation,  B,  C from Fig. 3 is near equating and near 220V, and phase difference is also near equating and near 120 °.

Induced potential in the above-mentioned analysis is to produce in the compensation electromagnetic coupling apparatus of being made by three single-phase iron cores, can certainly be on same tri-phase iron core with three compensation electromagnetic coupling apparatus designs, and the principle that induced potential produces is identical.

The output current of this device is when the 50-2000A scope, and the secondary winding number of turn of compensation electromagnetic coupler WA, WB, WC is the 20-150 circle, and the number of turn of elementary winding is the 10-200 circle.

Phase-shift controller in this device generally can adopt commercially available phase-shift voltage regulating device.

Imbalance compensation electromotive force of the present utility model produces automatically according to the degree of unbalance size, control device is simple in structure, reliable for effect, can obviously improve power supply, quality improves the useful life and the efficient of consumer electronics, can absorb the power pollution that external power grid produces, save a large amount of electricity charge spendings thereby can be the user.

Claims (2)

1, three-phase voltage amplitude and phase equilibrium expansion joint electric installation, it is characterized in that: housing is provided with three-phase alternating current input and output terminal, be fixed with phase-shift controller B φ in the housing, compensation electromagnetic coupling apparatus WA, WB, WC summation current transformer CT1, CT2, CT3, when each AC input terminal connects phase-shift controller B φ input respectively, also connect compensation electromagnetic coupling apparatus WA respectively, WB, the secondary winding of WC, be serially connected with current transformer CT1 respectively between each winding other end and corresponding ac output end, CT2, the elementary winding of CT3, each secondary winding different name end link to each other and are connected to the control input end of phase-shift controller B φ; The elementary winding different name end of each compensation electromagnetic coupling apparatus WA, WB, WC joins and is connected to the output of phase-shift voltage regulating device B φ through potentiometer RW.

2, balanced compensated battery saving arrangement as claimed in claim 1 is characterized in that: but each primary and secondary winding coil of each compensation electromagnetic coupling apparatus WA of tri-phase iron core coiling, WB, WC.

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