CN206977058U - A kind of four phase five-wire system low voltage distribution transformers - Google Patents

A kind of four phase five-wire system low voltage distribution transformers Download PDF

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Publication number
CN206977058U
CN206977058U CN201720899148.2U CN201720899148U CN206977058U CN 206977058 U CN206977058 U CN 206977058U CN 201720899148 U CN201720899148 U CN 201720899148U CN 206977058 U CN206977058 U CN 206977058U
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phase
feeder line
phases
transformer
voltage
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周福林
熊进飞
钟凯
郭成
陈志远
李琦琦
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Southwest Jiaotong University
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Southwest Jiaotong University
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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

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Abstract

The utility model discloses a kind of four phase five-wire system low voltage distribution transformers, it includes a Vv transformer and a three-phase transformer, two primary side windings of Vv transformers connect the B phases and C phases of three phase network, the A phases of the common point connection three phase network of two primary side windings respectively；The primary side winding of three-phase transformer is sequentially ingressed into the A phases, B phases and C phases of three phase network, and the common point of two secondary side load windings of three-phase transformer and the common point of Vv transformer secondary side windings are connected with each other and are used as N lines；Feeder line F1 and feeder line F2 are provided with Vv transformers；Feeder line F3 and feeder line F4 are provided with three-phase transformer；The first flexible compensation device is provided between feeder line F1 and feeder line F4；The second flexible compensation device is provided between feeder line F2 and feeder line F3.The utility model compares conventional three-phase four-wire system distribution system, can save a wire, and when two phase loads are equal, current in middle wire is only the 26% of biphase current sum so that this transformer is more economically efficient.

Description

A kind of four phase five-wire system low voltage distribution transformers
Technical field
It the utility model is related to field of power distribution, and in particular to a kind of four phase five-wire system low voltage distribution transformers.
Background technology
Power network uses three-phase power transmission all the time, and three-phase power transmission system has lot of advantages, is that various countries are widely used.Sending out Electric aspect, the threephase generator of identical size is bigger than the power of single-phase generator, in the case of threephase load identical, generator Constant torque, be advantageous to the work of generator；In terms of transmission, three-phase system saves transmission line, three phase-change pressures than monophase system Device is than single-phase transformer economy；In terms of electricity consumption, three phase capacitance, which is also easy to produce rotating excitation field, makes threephase motor smooth rotation.Cause This, in low-voltage distribution system, is influenceed by power network three-phase power transmission structure, mostly using three-phase transformer, carries out three-phase and four-line Distribution processed.But most of power loads are single-phase load in low-voltage distribution system, for example, city street lamp illuminator, city Rise residential and store, rural power grids distribution system etc..For the region that these single-phase loads are intensive, using the phase of three-phase four Distribution processed, conductor efficiency is low, causes substantial amounts of wire rod and wastes.And three transmissions of electricity are still set up for some light-loaded circuits Line, deficiency in economic performance.It along road be in the distribution of line shape that the load in the wide mountain area of western part of China is mostly, and above mentioned problem more protrudes.
Utility model content
For above-mentioned deficiency of the prior art, a kind of four phases five-wire system low voltage distribution transformer provided by the utility model Solves the problems, such as existing distributor deficiency in economic performance.
In order to reach foregoing invention purpose, the technical solution adopted in the utility model is：
A kind of four phase five-wire system low voltage distribution transformers are provided, it includes Vv transformers and three-phase transformer, Vv transformers Two primary side windings connect the B phases and C phases of three phase network, the A of the common point connection three phase network of two primary side windings respectively Phase；The primary side winding of three-phase transformer is sequentially ingressed into the A phases, B phases and C phases of three phase network, two secondary side loads of three-phase transformer The common point of winding and the common point of Vv transformer secondary side windings are connected with each other and are used as N lines；
The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network A phases is provided with Vv transformers Feeder line F1；The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network C phases is provided with Vv transformers Feeder line F2；The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network C phases is set in three-phase transformer There is feeder line F3；The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network A phases is set in three-phase transformer It is equipped with feeder line F4；The first flexible compensation device is provided between feeder line F1 and feeder line F4；It is provided between feeder line F2 and feeder line F3 Second flexible compensation device.
Further, the first flexible compensation device include the first static reacance generator, the second static reacance generator and First storage capacitor；First static reacance generator and the second static reacance generator are in parallel with the first storage capacitor；First The port of static reacance generator is connected with feeder line F1 and N line, and port and feeder line F4 and the N line of the second static reacance generator connect Connect.
Further, the second flexible compensation device include the 3rd static reacance generator, the 4th static reacance generator and Second storage capacitor；3rd static reacance generator and the 4th static reacance generator are in parallel with the second storage capacitor；3rd The port of static reacance generator is connected with feeder line F2 and N line, and port and feeder line F3 and the N line of the 4th static reacance generator connect Connect.
Further, three-phase transformer is the angle transformer of star three；Feeder line F1 voltage UF1With feeder line F3 voltage UF3Form The two-phase voltage that one group of phase difference is 150 °；Feeder line F2 voltage UF2With feeder line F4 voltage UF4Forming one group of phase difference is 150 ° of two-phase voltage；Feeder line F1 voltage UF1With feeder line F4 voltage UF4Between phase difference be 90 °；Feeder line F2 voltage UF2With feeder line F3 voltage UF3Between phase difference be 90 °.
The beneficial effects of the utility model are：
First, the phase distribution transformer of three phase transformation four is constructed using traditional Vv transformers and three-phase transformer, it is simple in construction, easily In realization, two-phase power supply and three phase supply can be achieved, meet the needs of different power loads, power supply mode flexibility and reliability, economy High efficiency.
2nd, the first flexible compensation device and the second flexible compensation device can realize that power is circulated, and mutually support, lifting electricity The comprehensive regulation of energy quality.
3rd, when implementing two-phase distribution, when two-phase payload is equal, current in middle wire is only the 26% of biphase current sum, Increase economic efficiency.
Brief description of the drawings
Fig. 1 is structure principle chart of the present utility model；
Fig. 2 is four phase voltages phasor diagram of the present utility model；
Fig. 3 is the schematic diagram that the utility model realizes two-phase power supply；
Fig. 4 is the schematic diagram that the utility model realizes two-phase power supply and three phase supply.
Embodiment
Specific embodiment of the present utility model is described below, in order to which those skilled in the art understand The utility model, it should be apparent that the utility model is not limited to the scope of embodiment, to the common skill of the art For art personnel, if various change in the spirit and scope of the present utility model that appended claim limits and determines, These changes are it will be apparent that all utilize the innovation and creation of the utility model design in the row of protection.
As shown in figure 1, the four phases five-wire system low voltage distribution transformer includes a Vv transformer and a three-phase transformer, Two primary side windings of Vv transformers connect the B phases and C phases of three phase network, the common point connection three-phase of two primary side windings respectively The A phases of power network；The primary side winding of three-phase transformer is sequentially ingressed into the A phases, B phases and C phases of three phase network, three-phase transformer two times The common point of side load winding and the common point of Vv transformer secondary side windings are connected with each other and are used as N lines；
The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network A phases is provided with Vv transformers Feeder line F1；The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network C phases is provided with Vv transformers Feeder line F2；The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network C phases is set in three-phase transformer There is feeder line F3；The node of the secondary side winding corresponding with connecting the primary side winding node of three phase network A phases is set in three-phase transformer It is equipped with feeder line F4；So that feeder line F1 corresponds to primary side line voltage UAB；Feeder line F2 corresponds to primary side line voltage UAC, feeder line F3 corresponds to primary side Phase voltage UB, feeder line F4 corresponds to primary side phase voltage UC.The first flexible compensation device is provided between feeder line F1 and feeder line F4；Feeder line The second flexible compensation device is provided between F2 and feeder line F3.
First flexible compensation device includes the first static reacance generator, the second static reacance generator and the first energy storage electricity Hold；First static reacance generator and the second static reacance generator are in parallel with the first storage capacitor；First static reacance is sent out The port of raw device is connected with feeder line F1 and N line, and the port of the second static reacance generator is connected with feeder line F4 and N line.
Second flexible compensation device includes the 3rd static reacance generator, the 4th static reacance generator and the second energy storage electricity Hold；3rd static reacance generator and the 4th static reacance generator are in parallel with the second storage capacitor；3rd static reacance is sent out The port of raw device is connected with feeder line F2 and N line, and the port of the 4th static reacance generator is connected with feeder line F3 and N line.
Three-phase transformer is the angle transformer of star three；As shown in Fig. 2 feeder line F1 voltage UF1With feeder line F3 voltage UF3Structure The two-phase voltage for being 150 ° into one group of phase difference；Feeder line F2 voltage UF2With feeder line F4 voltage UF4Forming one group of phase difference is 150 ° of two-phase voltage；Feeder line F1 voltage UF1With feeder line F4 voltage UF4Between phase difference be 90 °；Feeder line F2 voltage UF2With feeder line F3 voltage UF3Between phase difference be 90 °.
In one embodiment of the present utility model, as shown in figure 3, being mutually 150 two-phase voltage UF1、UF3And UF2、UF4 Powered respectively to single-phase load area (such as city street lamp illuminator, rise residential), the single-phase load of each unit is two Access is spaced between phase, ensures that two phase loads are as far as possible equal, such current in middle wire is as far as possible small.In UF1、UF4Two vertical port increases First flexible compensation device；In UF2、UF3Two vertical ports increase by the second flexible compensation device.
As shown in figure 4, single-phase load area (such as city street lamp illuminator, rise residential) is by being mutually 90 degree of two-phase Voltage UF1、UF4And UF2、UF3Power supply.In UF1、UF4Two vertical ports increase by the first flexible compensation device；In UF2、UF3Two is vertical Port increases by the second flexible compensation device, and power is circulated between realizing two-phase, is mutually supported, and realizes the Synthetic of the quality of power supply Reason.Draw two-phase vertical voltage UF1、UF4Or UF2、UF3By two phase transformation three-phases against balancing transformer, three-phase electricity supply is converted into Three-phase user uses.
The port of first static reacance generator and UF1Connected with N lines, the port of the second static reacance generator and UF4With N lines connect, with to UF1And UF4The electric energy of output carries out idle, harmonic compensation, it is ensured that output reaches default power quality standard Electric energy, and U is realized by Power ExchangeF1And UF4Between power conversion, realize the negative sequence compensation to three-phase side, and realize UF1And UF4Between power support, improve system reliability.
Similarly, the port of the 3rd static reacance generator and UF3Connected with N lines, the port of the 4th static reacance generator with UF2Connected with N lines, to UF2And UF3The electric energy of output carries out idle, harmonic compensation, it is ensured that output reaches default power quality standard Electric energy, and U is realized by Power ExchangeF2And UF3Between power conversion, realize the negative sequence compensation to three-phase side, and realize UF2And UF3Between power support.
For the utility model in distribution, the area intensive to single-phase load uses two-phase three wire system distribution system, two-phase electricity Pressure is derived from UF1、UF3Or UF2、UF4.Compared to conventional three-phase four-wire system distribution system, a wire can be saved.And when two phase loads When equal, current in middle wire is only the 26% of biphase current sum so that this transformer is more economically efficient.

Claims (4)

  1. A kind of 1. four phase five-wire system low voltage distribution transformers, it is characterised in that：Including Vv transformers and three-phase transformer, the Vv Two primary side windings of transformer connect the B phases and C phases of three phase network, the common point connection institute of described two primary side windings respectively State the A phases of three phase network；The primary side winding of the three-phase transformer is sequentially ingressed into the A phases, B phases and C phases of the three phase network, institute The common point of the common point and Vv transformer secondary side windings of stating two secondary side load windings of three-phase transformer is connected with each other and is used as N Line；
    The node of the secondary side winding corresponding with connecting the primary side winding node of the three phase network A phases is set in the Vv transformers It is equipped with feeder line F1；The secondary side winding corresponding with connecting the primary side winding node of the three phase network C phases in the Vv transformers Node be provided with feeder line F2；It is corresponding with connecting the primary side winding node of the three phase network C phases in the three-phase transformer The node of secondary side winding be provided with feeder line F3；With being connected the primary side windings of the three phase network A phases in the three-phase transformer The node of the corresponding secondary side winding of node is provided with feeder line F4；The first flexible benefit is provided between the feeder line F1 and feeder line F4 Repay device；The second flexible compensation device is provided between the feeder line F2 and feeder line F3.
  2. 2. four phases five-wire system low voltage distribution transformer according to claim 1, it is characterised in that：First flexible compensation Device includes the first static reacance generator, the second static reacance generator and the first storage capacitor；First static reacance Generator and second static reacance generator are in parallel with first storage capacitor；First static reacance generator Port be connected with the feeder line F1 and N lines, the port of second static reacance generator and the feeder line F4 and N lines connect Connect.
  3. 3. four phases five-wire system low voltage distribution transformer according to claim 1, it is characterised in that：Second flexible compensation Device includes the 3rd static reacance generator, the 4th static reacance generator and the second storage capacitor；3rd static reacance Generator and the 4th static reacance generator are in parallel with second storage capacitor；3rd static reacance generator Port be connected with the feeder line F2 and N lines, the port of the 4th static reacance generator connects with the feeder line F3 and N lines Connect.
  4. 4. according to any four described phase five-wire system low voltage distribution transformers of claim 1-3, it is characterised in that：Three phase transformation Depressor is the angle transformer of star three；The voltage U of the feeder line F1F1With feeder line F3 voltage UF3It is 150 ° to form one group of phase difference Two-phase voltage；The voltage U of the feeder line F2F2With feeder line F4 voltage UF4Form the two-phase voltage that one group of phase difference is 150 °；Institute State feeder line F1 voltage UF1With feeder line F4 voltage UF4Between phase difference be 90 °；The voltage U of the feeder line F2F2With feeder line F3 Voltage UF3Between phase difference be 90 °.
CN201720899148.2U 2017-07-24 2017-07-24 A kind of four phase five-wire system low voltage distribution transformers Active CN206977058U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107294115A (en) * 2017-07-24 2017-10-24 西南交通大学 A kind of four phase five-wire system low voltage distribution transformers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107294115A (en) * 2017-07-24 2017-10-24 西南交通大学 A kind of four phase five-wire system low voltage distribution transformers
CN107294115B (en) * 2017-07-24 2023-04-07 西南交通大学 Four-phase five-wire system low-voltage distribution transformer

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