CN106130046B - A kind of AC three-phase load automatic-balancing system - Google Patents
A kind of AC three-phase load automatic-balancing system Download PDFInfo
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- CN106130046B CN106130046B CN201610718784.0A CN201610718784A CN106130046B CN 106130046 B CN106130046 B CN 106130046B CN 201610718784 A CN201610718784 A CN 201610718784A CN 106130046 B CN106130046 B CN 106130046B
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The present invention relates to low voltage power transmission technical fields, a kind of AC three-phase load automatic-balancing system, including A phases sample circuit, B phases sample circuit, C phases sample circuit, rectification circuit, microcontroller, relay assembly circuit and first contactor, second contactor and third contactor are provided；Rectification circuit connects microcontroller, microcontroller connects relay assembly circuit, first contactor includes the first contact-making switch and the first hot-wire coil, and second contactor includes the second contact-making switch and the second hot-wire coil, and third contactor includes third contact-making switch and third hot-wire coil；First hot-wire coil is connect with the first relay switch, second hot-wire coil is connect with the second relay switch, third hot-wire coil is connect with third relay switch, microcontroller is for being monitored each road phases line voltage, and customer charge is switched in the most light phase line of load, it realizes the autobalance to three-phase load, quick cut phase, while also reducing the transformer burnout failure caused by inclined phase.
Description
Technical field
The invention belongs to low voltage power transmission technical field more particularly to a kind of AC three-phase load automatic-balancing systems.
Background technology
Three-phrase burden balance is to the safe operation of the stabilization of power grids and power equipment, line loss and living standard of urban and rural population electricity consumption
All have a direct impact.With rapid development of economy, urban and rural residents buy a large amount of household electrical appliance and single-phase electric machinery.It makes
At the irregular surge of single-phase load, three-phase voltage, electric current serious unbalance, it is clearly to be difficult to realize to manually adjust.
Especially in rural area, the extension of rural power grids is weak, and single-phase load property is more uncontrollable, and three-phase imbalance is particularly acute, agriculture
Net platform region is more dispersed, administers difficult.Three-phase imbalance has the disadvantage that：
(1) distribution transformer and line loss increase；
(2) the supply voltage quality of heavily loaded phase is greatly reduced in power distribution station；
(3) output of distribution transformer reduces, and energy conversion efficiency declines；
(4) three-phase load unbalance operation can cause distribution transformer zero-sequence current to increase, and caused eddy-current loss makes to match
Piezoelectric transformer running temperature increases, and jeopardizes equipment safety when serious, shortens equipment life.
Currently, being directed to three-phase load unbalance problem, power supply department is mainly using load management is reinforced, by manually adjusting
Load in each phase of low-voltage circuit is balanced distribution by load phase sequence.Although power distribution station can be reduced to a certain extent
The severity of three-phase load unbalance, but due to the randomness and uncertainty of power load, by manually can not be according to reality
The load unbalanced situation in border is adjusted in time, inevitably influences customer power supply reliability, and there are security risks.
Invention content
The purpose of the present invention is to provide it is a kind of to three-phase load carry out autobalance, quick cut phase, at the same also reduce because
The AC three-phase load automatic-balancing system of transformer burnout failure caused by inclined phase.
The invention is realized in this way a kind of AC three-phase load automatic-balancing system, the AC three-phase load is automatic
Balance system includes the B phases for accessing the A phases sample circuit of A phase lines by the first access point, accessing B phase lines by the second access point
Sample circuit and the C phase sample circuits that C phase lines are accessed by third access point；
The output end of the A phases sample circuit, B phases sample circuit and C phase sample circuits is all connected with signal conversion and rectification
Circuit, the signal conversion is connected with rectification circuit carries out voltage monitoring and for controlling respectively to A phase lines, B phase lines and C phase lines
Switch the microcontroller of phase line, the microcontroller connects relay assembly circuit, and the relay assembly circuit includes the first relay
Device switch, the second relay switch and third relay switch；
The AC three-phase load automatic-balancing system further includes first contactor, second contactor and third contactor,
The first contactor include the first contact-making switch and the first hot-wire coil, the second contactor include the second contact-making switch and
Second hot-wire coil, the third contactor include third contact-making switch and third hot-wire coil；
First contact-making switch is mounted in the A phase lines in first access point downstream, and described second connects
Tactile switch is mounted in the B phase lines in second access point downstream, and the third contact-making switch is mounted on institute
It states in the C phase lines in third access point downstream；
First hot-wire coil is connect with first relay switch, second hot-wire coil with described second after
Electric switch connects, and the third hot-wire coil is connect with the third relay switch；
First relay switch, the second relay switch and third relay switch are single-pole double-throw switch (SPDT)；
The relay assembly circuit includes relay interlocking control circuit；
The relay interlocking control circuit includes that power access end, the first wiring section, the second wiring section and third connect
Line segment；
Described first wiring section one end is connect with first hot-wire coil, and the other end is equipped with the first contact；
Described second wiring section one end is connect with second hot-wire coil, and the other end is equipped with the second contact；
Described third wiring section one end is connect with the third hot-wire coil, and the other end is equipped with third contact；
The 4th wiring section, the 4th wiring are equipped between first relay switch and second relay switch
One end of section is connect with the stationary contact of first relay switch, and the other end is equipped with the 4th contact；
The 5th wiring section, the 5th wiring are equipped between second relay switch and the third relay switch
One end of section is connect with the stationary contact of second relay, and the other end is equipped with the 5th contact, second relay switch
Movable contact is fastened on the 4th contact or the second contact；
The stationary contact of the third relay switch is connect with the power access end, and the third relay switch moves
Contact is fastened on the 5th contact or third contact.
As an improvement scheme, first contact is the normally-closed contact of first relay switch, described the
Two contacts are the normally opened contact of second relay, and the 4th contact is the normally-closed contact of second relay, described
Third contact is the normally opened contact of the third relay switch, and the 5th contact is the normally closed of the third relay switch
Contact.
As an improvement scheme, the AC three-phase load automatic-balancing system further include contactor interlocking control electricity
Road.
As an improvement scheme, the contactor interlocking control circuit include be connected between phase line and the neutral conductor and
First via interlock circuit, No. second interlock circuit and third road interlock circuit parallel with one another.
As an improvement scheme, the first contactor, second contactor and third contactor further include first
Auxiliary contactor switch and the second auxiliary contactor switch；
The first via interlock circuit include the first relay switch being sequentially connected in series between the phase line and the neutral conductor,
First auxiliary contactor switch of second contactor, the first auxiliary contactor switch of third contactor and the first hot-wire coil；
No. second interlock circuit include the second relay switch being sequentially connected in series between the phase line and the neutral conductor,
First auxiliary contactor switch of first contactor, the second auxiliary contactor switch of third contactor and the second hot-wire coil；
Third road interlock circuit include the third relay switch being sequentially connected in series between the phase line and the neutral conductor,
Second auxiliary contactor switch of first contactor, the second auxiliary contactor switch of second contactor and third hot-wire coil.
In embodiments of the present invention, AC three-phase load automatic-balancing system include A phases sample circuit, B phases sample circuit,
C phases sample circuit, signal conversion and rectification circuit, microcontroller, relay assembly circuit and first contactor, second contactor
With third contactor；Signal conversion connects microcontroller with rectification circuit, and microcontroller connects relay assembly circuit, first contactor
Including the first contact-making switch and the first hot-wire coil, second contactor includes the second contact-making switch and the second hot-wire coil, third
Contactor includes third contact-making switch and third hot-wire coil；First hot-wire coil is connect with the first relay switch, and second is logical
Electric coil is connect with the second relay switch, and third hot-wire coil is connect with third relay switch, and microcontroller is used for each road
Phases line voltage is monitored, and customer charge is switched in the most light phase line of load, realizes the autobalance to three-phase load,
Quick cut phase, while also reducing the transformer burnout failure caused by inclined phase.
Due to the setting of relay interlocking control circuit and contactor interlocking control circuit, make entire AC three-phase load certainly
The quick cut phase of dynamic balance system safety and steady, avoids safety accident caused by phase short-circuit between conductors.
Description of the drawings
Fig. 1 is the structural schematic diagram of AC three-phase load automatic-balancing system provided by the invention；
Fig. 2 is the structural schematic diagram of relay interlocking control circuit provided by the invention；
Fig. 3 is the structural schematic diagram of contactor interlocking control circuit provided by the invention；
Wherein, the first access points of 1-, the second access points of 2-, 3- third access points, 4-A phase sample circuits, 5-B phases sample electricity
Road, 6-C phase sample circuits, the conversion of 7- signals and rectification circuit, 8- microcontrollers, 9- relay assembly circuits, the first relays of 10-
Switch, the second relay switches of 11-, 12- third relay switches, the first contact-making switches of 13-, the first hot-wire coils of 14-, 15-
Second contact-making switch, the second hot-wire coils of 16-, 17- third contact-making switches, 18- third hot-wire coils, 19- power access ends,
20- the first wiring sections, 21- the second wiring sections, 22- third wiring sections, the first contacts 23-, the second contacts 24-, 25- thirds are touched
Point, the 4th wiring sections of 26-, the 4th contacts 27-, the 5th wiring sections of 28-, the 5th contacts 29-, 30- first via interlock circuits, 31-
No. second interlock circuit, 32- thirds road interlock circuit, the first auxiliary contactor switch of 33- first contactors, 34- first are contacted
Second auxiliary contactor switch of device, the first auxiliary contactor switch of 35- second contactors, the second auxiliary of 36- second contactors
Contact-making switch, the first auxiliary contactor switch of 37- third contactors, the second auxiliary contactor switch of 38- third contactors.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the structural schematic diagram of AC three-phase load automatic-balancing system provided by the invention, for the ease of saying
It is bright, part related to the present invention is only gived in figure.
AC three-phase load automatic-balancing system includes accessing the A phases sample circuit 4 of A phase lines by the first access point 1, leading to
It crosses the B phases sample circuit 5 of the second access point 2 access B phase lines and accesses the C phases sample circuit 6 of C phase lines by third access point 3；
The output end of A phases sample circuit 4, B phases sample circuit 5 and C phases sample circuit 6 is all connected with signal conversion and rectified current
Road 7, signal conversion and the connection of rectification circuit 7 carry out voltage monitoring to A phase lines, B phase lines and C phase lines and respectively for controlling switching
The microcontroller 8 of phase line, microcontroller 8 connect relay assembly circuit 9, relay assembly circuit 9 include the first relay switch 10,
Second relay switch 11 and third relay switch 12；
AC three-phase load automatic-balancing system further includes first contactor, second contactor and third contactor, and first
Contactor includes the first contact-making switch 13 and the first hot-wire coil 14, and second contactor is logical including the second contact-making switch 15 and second
Electric coil 16, third contactor include third contact-making switch 17 and third hot-wire coil 18；
First contact-making switch 13 is mounted in the A phase lines in 1 downstream of the first access point, and the second contact-making switch 15 is mounted on
In the B phase lines in the second access point downstream, third contact-making switch 17 is mounted in the C phase lines in third access point downstream；
First hot-wire coil 14 is connect with the first relay switch 10, the second hot-wire coil 16 and the second relay switch 11
Connection, third hot-wire coil 18 are connect with third relay switch 12.
Wherein, above-mentioned A phases sample circuit 4, B phases sample circuit 5 and C phases sample circuit 6 are made of mutual inductor, main
For being acquired to the voltage in corresponding phase line, and send collected voltage to signal conversion and rectification circuit 7, then
It transfers to microcontroller 8 to be monitored in real time again, continues to monitor a period of time, and to the voltage value of this period of time each phase line of past
It is calculated, and controls and be switched to electrical equipment in the most light phase line of load using phase line, for the connection knot of mutual inductor
Structure, details are not described herein.
It is 24 hours for a period of time that this, which is continued to monitor, 24 hours states that can generally embody power load in phase line.
In this embodiment, the first relay switch 10, the second relay switch 11 and third relay switch 12 are
Single-pole double-throw switch (SPDT) keeps entire circuit structure simple, handling strong.
In embodiments of the present invention, further include relay interlocking control circuit in above-mentioned relay assembly circuit 9, it should be after
Electric appliance interlocking control circuit is used for the safety to ensureing cut phase, i.e., before power load is switched to next phase line, in addition
It is guaranteed at circuitry cuts state in two phase lines.
Wherein, as shown in Fig. 2, above-mentioned relay interlocking controller circuit include power access end 19, the first wiring section 20,
Second wiring section 21 and third wiring section 22；
First wiring section, 20 one end is connect with the first hot-wire coil 14, and the other end is equipped with the first contact 23；
Second wiring section, 21 one end is connect with the second hot-wire coil 16, and the other end is equipped with the second contact 24；
22 one end of third wiring section is connect with third hot-wire coil 18, and the other end is equipped with third contact 25；
The 4th wiring section 26 is equipped between first relay switch 10 and the second relay switch 11, the 4th wiring section 26
One end is connect with the stationary contact of the first relay switch 10, and the other end is equipped with the 4th contact 27；
The 5th wiring section 28 is equipped between second relay switch 11 and third relay switch 12, the 5th wiring section 28
One end is connect with the stationary contact of the second relay, and the other end is equipped with the 5th contact 29, the movable contact button of the second relay switch 11
It closes on the 4th contact 27 or the second contact 24；
The stationary contact of third relay switch 12 is connect with power access end 19, the movable contact button of third relay switch 12
It closes on the 5th contact 29 or third contact 25.
In this embodiment, as shown in Fig. 2, the first contact 23 is the normally-closed contact of the first relay switch 10, second touches
Point 24 is the normally opened contact of the second relay, and the 4th contact 27 is the normally-closed contact of the second relay, and third contact 25 is third
The normally opened contact of relay switch 12, the 5th contact 29 are the normally-closed contact of third relay switch 12.
In embodiments of the present invention, AC three-phase load automatic-balancing system further includes contactor interlocking control circuit, should
Contactor interlocking control circuit is used for the safety to ensureing cut phase, i.e., before power load is switched to next phase line, separately
It is guaranteed at circuitry cuts state in outer two phase lines, i.e., regardless of the state of relay switch, all in circuitry cuts shape
State.
As shown in figure 3, contactor interlocking control circuit includes being connected between phase line and the neutral conductor and parallel with one another
Interlock circuit 30, No. second interlock circuit 31 and third road interlock circuit 32 all the way；
Wherein, first contactor, second contactor and third contactor further include the first auxiliary contactor switch and second
Auxiliary contactor switch；
First via interlock circuit 30 includes the first relay switch 10, second being sequentially connected in series between phase line and the neutral conductor
First auxiliary contactor switch 35 of contactor, the first auxiliary contactor switch 37 of third contactor and the first hot-wire coil 14；
No. second interlock circuit 31 includes the second relay switch 11, first being sequentially connected in series between phase line and the neutral conductor
First auxiliary contactor switch 33 of contactor, the second auxiliary contactor switch 38 of third contactor and the second hot-wire coil 16；
Third road interlock circuit 32 includes the third relay switch 12, first being sequentially connected in series between phase line and the neutral conductor
Second auxiliary contactor switch 34 of contactor, the second auxiliary contactor switch 36 of second contactor and third hot-wire coil 18.
For convenience of description, the operation principle of contactor interlocking control circuit is illustrated in conjunction with Fig. 3：
Assuming that power load continues monitoring in 24 hours through microcontroller 8 on first via interlock circuit 30 at present, phase is judged
Line B is the phase line that load is most light in three-phase, therefore, it is necessary to control power load being switched on phase line B, at this point, microcontroller 8 is given
First relay switch sends open command, and close command is sent to the second relay switch；
First relay switch disconnects, and the second relay switch is closed, while the first auxiliary for controlling second contactor connects
Tactile switch, the second auxiliary contactor switch are in off-state, and the first auxiliary contactor switch 33 of first contactor, third connect
Second auxiliary contactor switch of tentaculum is in closed state, at this point, No. second interlock circuit is in energized state；
Second hot-wire coil 16 of second contactor powers on, and is attracted the second contact-making switch 15 and is closed, power load is switched
Onto phase line B.
In embodiments of the present invention, AC three-phase load automatic-balancing system includes A phases sample circuit 4, B phase sample circuits
5, C phases sample circuit 6, signal conversion and rectification circuit 7, microcontroller 8, relay assembly circuit 9 and first contactor, second
Contactor and third contactor；Signal is converted and rectification circuit 7 connects microcontroller 8, and microcontroller 8 connects relay assembly circuit 9,
First contactor includes the first contact-making switch 13 and the first hot-wire coil 14, and second contactor includes the second contact-making switch 15 and the
Two hot-wire coils 16, third contactor include third contact-making switch 17 and third hot-wire coil 18；First hot-wire coil 14 and
One relay switch 10 connects, and the second hot-wire coil 16 is connect with the second relay switch 11, third hot-wire coil 18 and third
Relay switch 12 connects, and microcontroller 8 is for being monitored each road phases line voltage, and it is most light that customer charge is switched to load
Phase line on, realize to the autobalance of three-phase load, quick cut phase, while also reducing the transformer caused by inclined phase and burning thing
Therefore.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made by within principle etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of AC three-phase load automatic-balancing system, which is characterized in that the AC three-phase load automatic-balancing system packet
Include by the first access point access A phase lines A phases sample circuit, by the second access point access B phase lines B phases sample circuit and
The C phase sample circuits of C phase lines are accessed by third access point；
The output end of the A phases sample circuit, B phases sample circuit and C phase sample circuits is all connected with signal conversion and rectification circuit,
The signal conversion is connected with rectification circuit carries out voltage monitoring and for controlling switching respectively to A phase lines, B phase lines and C phase lines
The microcontroller of phase line, the microcontroller connect relay assembly circuit, and the relay assembly circuit is opened including the first relay
Pass, the second relay switch and third relay switch；
The AC three-phase load automatic-balancing system further includes first contactor, second contactor and third contactor, described
First contactor includes the first contact-making switch and the first hot-wire coil, and the second contactor includes the second contact-making switch and second
Hot-wire coil, the third contactor include third contact-making switch and third hot-wire coil；
First contact-making switch is mounted in the A phase lines in first access point downstream, and second contact is opened
Pass is mounted in the B phase lines in second access point downstream, and the third contact-making switch is mounted on described the
In the C phase lines in three access point downstreams；
First hot-wire coil is connect with first relay switch, second hot-wire coil and second relay
Switch connection, the third hot-wire coil are connect with the third relay switch；
First relay switch, the second relay switch and third relay switch are single-pole double-throw switch (SPDT)；
The relay assembly circuit includes relay interlocking control circuit；
The relay interlocking control circuit includes power access end, the first wiring section, the second wiring section and third wiring section；
Described first wiring section one end is connect with first hot-wire coil, and the other end is equipped with the first contact；
Described second wiring section one end is connect with second hot-wire coil, and the other end is equipped with the second contact；
Described third wiring section one end is connect with the third hot-wire coil, and the other end is equipped with third contact；
The 4th wiring section is equipped between first relay switch and second relay switch, the 4th wiring section
One end is connect with the stationary contact of first relay switch, and the other end is equipped with the 4th contact；
The 5th wiring section is equipped between second relay switch and the third relay switch, the 5th wiring section
One end is connect with the stationary contact of second relay, and the other end is equipped with the 5th contact, and the dynamic of second relay switch touches
Point is fastened on the 4th contact or the second contact；
The stationary contact of the third relay switch is connect with the power access end, the movable contact of the third relay switch
It is fastened on the 5th contact or third contact.
2. AC three-phase load automatic-balancing system according to claim 1, which is characterized in that first contact is institute
The normally-closed contact of the first relay switch is stated, second contact is the normally opened contact of second relay, and the described 4th touches
Point is the normally-closed contact of second relay, and the third contact is the normally opened contact of the third relay switch, described
5th contact is the normally-closed contact of the third relay switch.
3. AC three-phase load automatic-balancing system according to claim 1, which is characterized in that the AC three-phase load
Automatic-balancing system further includes contactor interlocking control circuit.
4. AC three-phase load automatic-balancing system according to claim 3, which is characterized in that the contactor interlocking control
Circuit processed includes being connected between phase line and the neutral conductor and first via interlock circuit parallel with one another, No. second interlock circuit and
No. three interlock circuits.
5. AC three-phase load automatic-balancing system according to claim 4, which is characterized in that the first contactor,
Second contactor and third contactor further include the first auxiliary contactor switch and the second auxiliary contactor switch；
The first via interlock circuit includes the first relay switch being sequentially connected in series between the phase line and the neutral conductor, second
First auxiliary contactor switch of contactor, the first auxiliary contactor switch of third contactor and the first hot-wire coil；
No. second interlock circuit includes the second relay switch being sequentially connected in series between the phase line and the neutral conductor, first
First auxiliary contactor switch of contactor, the second auxiliary contactor switch of third contactor and the second hot-wire coil；
Third road interlock circuit includes the third relay switch being sequentially connected in series between the phase line and the neutral conductor, first
Second auxiliary contactor switch of contactor, the second auxiliary contactor switch of second contactor and third hot-wire coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610718784.0A CN106130046B (en) | 2016-08-25 | 2016-08-25 | A kind of AC three-phase load automatic-balancing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610718784.0A CN106130046B (en) | 2016-08-25 | 2016-08-25 | A kind of AC three-phase load automatic-balancing system |
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| Publication Number | Publication Date |
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| CN106130046A CN106130046A (en) | 2016-11-16 |
| CN106130046B true CN106130046B (en) | 2018-08-14 |
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| CN201610718784.0A Active CN106130046B (en) | 2016-08-25 | 2016-08-25 | A kind of AC three-phase load automatic-balancing system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107147113A (en) * | 2017-06-05 | 2017-09-08 | 泰豪科技股份有限公司 | A kind of phase change method and device without phase fault |
| CN107994591A (en) * | 2017-12-20 | 2018-05-04 | 厦门宏发电力电器有限公司 | A kind of three-phase phase reversal relay combining structure with auto-lock function |
| CN108063446A (en) * | 2017-12-20 | 2018-05-22 | 厦门宏发电力电器有限公司 | A kind of three-phase phase reversal relay combining structure |
| CN110492503A (en) * | 2019-08-09 | 2019-11-22 | 国网浙江仙居县供电有限公司 | Single-phase load automatic phase selecting equipment |
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| CN104578117A (en) * | 2014-12-31 | 2015-04-29 | 北京中电博达科技有限公司 | Intelligent phase choosing switch based on power line carrier communication and control circuit thereof |
| CN205248819U (en) * | 2015-11-20 | 2016-05-18 | 王海 | Looks switch is selected to three phase loads of low pressure |
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| CN206023235U (en) * | 2016-08-25 | 2017-03-15 | 李建新 | A kind of AC three-phase load automatic-balancing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3863123B2 (en) * | 2003-04-04 | 2006-12-27 | 三菱電機株式会社 | 3-phase circuit load unbalance elimination control system |
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| CN104578117A (en) * | 2014-12-31 | 2015-04-29 | 北京中电博达科技有限公司 | Intelligent phase choosing switch based on power line carrier communication and control circuit thereof |
| CN205248819U (en) * | 2015-11-20 | 2016-05-18 | 王海 | Looks switch is selected to three phase loads of low pressure |
| CN205453147U (en) * | 2016-03-15 | 2016-08-10 | 河南隆鑫电力设备有限公司 | Three -phase unbalanced load adjusting device |
| CN206023235U (en) * | 2016-08-25 | 2017-03-15 | 李建新 | A kind of AC three-phase load automatic-balancing system |
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| CN106130046A (en) | 2016-11-16 |
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