CN202957611U - Three-phase current unbalance adjusting system of power distribution network - Google Patents
Three-phase current unbalance adjusting system of power distribution network Download PDFInfo
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- CN202957611U CN202957611U CN2012205790099U CN201220579009U CN202957611U CN 202957611 U CN202957611 U CN 202957611U CN 2012205790099 U CN2012205790099 U CN 2012205790099U CN 201220579009 U CN201220579009 U CN 201220579009U CN 202957611 U CN202957611 U CN 202957611U
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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
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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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The utility model relates to a three-phase current unbalance adjusting system of power distribution network, comprising a control terminal and at least one adjusting switch. A single-phase load is connected to electric network via the adjusting switch; and the control terminal calculates unbalancing degree among phases via acquired voltage values of the phases and a current value in the electric network, and controls states of the adjusting switches according to the unbalancing degree. The three-phase current unbalance adjusting system of power distribution network has the beneficial effects that adjustment of three-phase current unbalance is carried out in real time; over-zero switching can be realized, which is characterized by low power consumption, fast switching and small impact on downstream loads; the system also has functions including leakage monitoring, single-phase short circuit protection and protection against lightning strike; and the control terminal can upload collected data to a host for power distribution management and receive instruction of the host for power distribution management, which is helpful for realizing digital management of the power distribution network, consistent with core design idea of intelligent electric network, and significant in energy saving and consumption reducing.
Description
Technical field
The utility model relates to a kind of power equipment, particularly a kind of power distribution network three-phase current unbalance adjustment System.
Background technology
Three-phase imbalance is one of subject matter of low-voltage network always, especially in rural power grids or the electricity consumption of city dweller residential quarters, power consumer mostly is single-phase load or single-phase mixed with three-phase load, payload and electricity consumption time are uncontrollable, are easy to cause the imbalance of electrical network three-phase current.
Unsymmetrical current in electrical network gently reduces the power supplying efficiency of circuit and distribution transformer, heavy can be excessive because of certain phase uncompensated load, causes that phase conductor blows, switch burns out even Distribution Transformer Burning.Therefore, in relevant regulations, electrical network negative current degree of unbalance is had to strict requirement.For example: the load current degree of unbalance in distribution transformer exit should be less than 10%, and the head end current unbalance factor of low pressure backbone and Main Branches should be less than 20%.
The improvement method of power network current three-phase imbalance can be classified as two kinds basically.First method is implemented by the personnel of power supply station, and common situation is by each phase load data of the personnel of power supply station periodic logging, by the analysis to record data, circuit is adjusted targetedly.This method mainly contains two drawbacks, and the one, expend a large amount of when artificial; The 2nd, this adjustment is the balance on macroscopic view, does not have real-time, especially for the very large appliance load of electricity consumption period uncertainty.In second, method is the unsymmetrical current compensation arrangement adopted, and generally has the reactive power compensation ability simultaneously, can well solve the current three-phase imbalance problem.But this device price general charged is higher, relatively be applicable to centralized compensation, do not solve line loss problem; In addition, also there are the shortcomings such as own loss is large.
Summary of the invention
Goal of the invention: be to provide a kind of power distribution network three-phase current unbalance adjustment System for above problem the purpose of this utility model, can realize the real-time calculating of tri-phase unbalance factor and the quick switching of uncompensated load.
Technical scheme: a kind of power distribution network three-phase current unbalance adjustment System, comprise a control terminal and at least one adjustment switch, single-phase load is by adjusting switch access electrical network; Described control terminal calculates each phase degree of unbalance by the current value gathered in each phase voltage value and electrical network, controls the state of respectively adjusting switch according to the degree of unbalance calculated.Adjusting switch is the instruction by control terminal, realize the unbalance control to the three phase network electric current, and control command comes from the calculating of control terminal.
Described control terminal comprises control unit and wireless communication unit, described adjustment switch comprises the first combination switch, the second combination switch and the 3rd combination switch, described No. three combination switches comprise bidirectional triode thyristor in parallel and magnetic latching relay, described the first combination switch, be respectively equipped with the controller that can carry out radio communication with wireless communication unit and can control bidirectional triode thyristor and magnetic latching relay in the second combination switch and the 3rd combination switch, described the first combination switch, the second combination switch and the 3rd combination switch respectively with the three phase mains L1 of electrical network, the input of L2 and L3 is connected, the output of No. three combination switches connects as the output of adjusting switch, described wireless communication unit sends instruction to controller and realizes the automatic control to electrical network, and controller feeds back to wireless communication unit by off state.Combination switch is from tape controller, and this controller can carry out radio communication with control terminal, and can control closure and the disconnection of each road combination switch according to the command signal from control terminal, realizes automatically controlling.
The controller that the trigger current of bidirectional triode thyristor carries from combination switch, the directly three phase mains power taking from inputting of controller; The controller that the drive pulse signal of magnetic latching relay also carries from combination switch, and control command is from long-range control terminal.
Described adjustment switch also comprises and single control switch, and the input of described single control switch and L1 power input commonly used mutually are connected, during normal operation, and the single control switch disconnection; The output of described single control switch and No. three combination switches is connected as the output of adjusting switch.Single control switch is mainly used in tackling the situation that combination switch lost efficacy, so only need the single control switch that is in parallel to get final product; Also can reduce the cost simultaneously.
A road single control switch in parallel is inputted mutually with L1 in described adjustment switch Ling She mono-tunnel, realizes manually controlling; Four tunnels outputs of described adjustment switch link together, and the degree of unbalance that a road output current detection circuit and three road input voltage detection circuits can calculate three-phase current fast is set; Described adjustment switch adopts communication to communicate by letter with control terminal.Carry out manual switchover by handle or knob between single control switch and L1 phase combination switch, then single control switch can independently carry out closure, disconnect and controlling.
Described control terminal can detect power distribution network side three-phase current information, and calculates the uneven situation of three-phase current; Can receive the data that switch is adjusted on each road by communication, and calculate and the most reasonably adjust the switching over instruction according to the data of above-mentioned two aspects.Described control terminal also is provided with and the circuit of digital communication between main frame for extraneous distribution management.
Beneficial effect: because control terminal can calculate the uneven situation of electrical network fast, and regulate rapidly the switching situation of adjusting switch, make the three-phase current unbalance adjustment there is real-time; Because diverter switch has combination switch, therefore can realize the zero passage switching, there is loss little, switch fast characteristics, little on the downstream load impact; There is detection and protective circuit owing to adjusting switch, so native system also have the functions such as line electrical leakage monitoring, single-phase short circuit protection, lightning strike protection.
Owing to being provided with and the circuit of digital communication between main frame for extraneous distribution management, the data upload that control terminal can be gathered is to the distribution management main frame, and the instruction of main frame for the reception distribution management, be conducive to realize the digital management of power distribution network, consistent with the core design theory of intelligent grid, and to energy-saving and cost-reducing significant.
The accompanying drawing explanation
Fig. 1 is that system of the present utility model forms schematic diagram;
The schematic diagram that Fig. 2 is adjustment switch of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
A kind of power distribution network three-phase current unbalance adjustment System, comprise a control terminal 1 and at least one adjustment switch 2, and single-phase load 3 is by adjusting switch 2 access electrical networks; Described control terminal 1 calculates each phase degree of unbalance by the current value gathered in each phase voltage value and electrical network, controls the state of respectively adjusting switch 2 according to the degree of unbalance calculated.
Described control terminal 1 comprises control unit 11 and wireless communication unit 12, described adjustment switch 2 comprises the first combination switch 21, the second combination switch 22 and the 3rd combination switch 23, described No. three combination switches comprise bidirectional triode thyristor in parallel 24 and magnetic latching relay 25, described the first combination switch 21, be respectively equipped with in the second combination switch 22 and the 3rd combination switch 23 and can carry out radio communication with wireless communication unit 12 and can control bidirectional triode thyristor 24 and the controller of magnetic latching relay 25, described the first combination switch 21, the second combination switch 22 and the 3rd combination switch 23 respectively with the three phase mains L1 of electrical network, the input of L2 and L3 is connected, the output of No. three combination switches connects as the output of adjusting switch 2, described wireless communication unit 12 sends instruction to controller and realizes the automatic control to electrical network, and controller feeds back to wireless communication unit 12 by off state.
Described adjustment switch 2 also comprises and single control switch 26, and the input of described single control switch 26 and L1 power input commonly used mutually are connected, during normal operation, and single control switch 26 disconnections; The output of described single control switch 26He No. tri-combination switches connects as the output of adjusting switch 2.
As shown in Figure 1, native system is comprised of control terminal 1 and an a plurality of adjustment switch 2 that is arranged on each single-phase user's side that is arranged on power distribution network main transformer outlet side.
Described control terminal 1 gathers by three-phase current detection device (as current sensor) current data that the output of power distribution network transformer is surveyed, and calculates the uneven situation of three-phase current according to these current data.
Described control terminal 1 receives current data and the on off state of respectively adjusting switch 2 by communication (as Zigbee, GPRS etc.).
Described control terminal 1, according to the current data of respectively adjusting switch 2 collected and the uneven situation of power distribution network, calculates the switching command of respectively adjusting switch 2, and by communication, switching command is sent to and respectively adjusts switch 2.
As shown in Figure 2, described adjustment switch 2 mainly is comprised of four-way switch: No. three bidirectional triode thyristors 24 and magnetic latching relay 25 parallel connections " combination switch ”He mono-road single control switch 26, an end of four-way switch links together, as the output of adjusting switch 2.Wherein, combination switch is for realizing automatic control, and single control switch 26 is for realizing manual control.The input of single control switch 26 is commonly used mutually the power supply input with L1 and is connected, and during normal operation, single control switch 26 disconnects.
The output of described adjustment switch 2 has a current sensing means (as current transformer, current sensor etc.), and the current signal of collection directly is transferred in the control unit 11 of control terminal 1; Input has three road voltage check devices (as voltage sensor), and the voltage signal of collection directly is transferred in the control unit 11 of control terminal 1.
Described adjustment switch, when receiving the switching command of control terminal, carries out following control action (supposing to be switched to mutually the L2 phase from L1) successively:
1, the bidirectional triode thyristor of triggering and conducting L1 phase combination switch at first;
2, disconnect the magnetic latching relay of L1 phase;
3,, when L1 phase output current zero passage being detected, disconnect the bidirectional triode thyristor of L1 phase;
4, when the voltage zero-cross of L2 phase being detected, the bidirectional triode thyristor of triggering and conducting L2 phase;
5, the magnetic latching relay of closed L2 phase;
6, after L2 phase magnetic latching relay closure, disconnect the bidirectional triode thyristor of L2 phase, complete the switching action.
The whole switching action of described adjustment switch 2 is no more than 20ms.
Described adjustment switch 2 is provided with controller (as Zigbee, GPRS etc.), can send the signals such as electric current, on off state to control terminal 1, and receive the command signal of control terminal 1.
Claims (3)
1. a power distribution network three-phase current unbalance adjustment System is characterized in that: comprise that a control terminal (1) and at least one adjust switch (2), single-phase load (3) is by adjusting switch (2) access electrical network; Described control terminal (1) calculates each phase degree of unbalance by the current value gathered in each phase voltage value and electrical network, controls the state of respectively adjusting switch (2) according to the degree of unbalance calculated.
2. power distribution network three-phase current unbalance adjustment System according to claim 1, it is characterized in that: described control terminal (1) comprises control unit (11) and wireless communication unit (12), described adjustment switch (2) comprises the first combination switch (21), the second combination switch (22) and the 3rd combination switch (23), described No. three combination switches comprise bidirectional triode thyristor in parallel (24) and magnetic latching relay (25), described the first combination switch (21), be respectively equipped with in the second combination switch (22) and the 3rd combination switch (23) and can carry out radio communication with wireless communication unit (12) and can control bidirectional triode thyristor (24) and the controller of magnetic latching relay (25), described the first combination switch (21), the second combination switch (22) and the 3rd combination switch (23) respectively with the three phase mains L1 of electrical network, the input of L2 and L3 is connected, the output of No. three combination switches connects as the output of adjusting switch (2), described wireless communication unit (12) sends instruction to controller and realizes the automatic control to electrical network, and controller feeds back to wireless communication unit (12) by off state.
3. power distribution network three-phase current unbalance adjustment System according to claim 2, it is characterized in that: described adjustment switch (2) also comprises and single control switch (26), the input of described single control switch (26) is commonly used mutually power input with L1 and is connected, during normal operation, single control switch (26) disconnects; The output of described single control switch (26) and No. three combination switches is connected as the output of adjusting switch (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205790099U CN202957611U (en) | 2012-11-05 | 2012-11-05 | Three-phase current unbalance adjusting system of power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205790099U CN202957611U (en) | 2012-11-05 | 2012-11-05 | Three-phase current unbalance adjusting system of power distribution network |
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| CN202957611U true CN202957611U (en) | 2013-05-29 |
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| CN2012205790099U Expired - Fee Related CN202957611U (en) | 2012-11-05 | 2012-11-05 | Three-phase current unbalance adjusting system of power distribution network |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
| CN103259276A (en) * | 2013-06-04 | 2013-08-21 | 长沙高升电子电器科技有限公司 | Automatic intelligent power distribution system and power distribution method |
| CN103354361A (en) * | 2013-06-19 | 2013-10-16 | 国家电网公司 | Low-voltage three-phase load automation balancing device |
| CN104201703A (en) * | 2014-09-04 | 2014-12-10 | 湖北追日电气股份有限公司 | Method for solving problem of three-phase unbalance of bi-direction charge/discharge machine |
| CN104752968A (en) * | 2014-12-01 | 2015-07-01 | 宁波天顺电气有限公司 | Power box with dual power supplies |
| WO2023001378A1 (en) * | 2021-07-22 | 2023-01-26 | Hitachi Energy Switzerland Ag | Hybrid phase selector |
-
2012
- 2012-11-05 CN CN2012205790099U patent/CN202957611U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102904270A (en) * | 2012-11-05 | 2013-01-30 | 镇江长河电力技术有限公司 | Three-phase current unbalance adjusting system for power distribution network |
| CN103259276A (en) * | 2013-06-04 | 2013-08-21 | 长沙高升电子电器科技有限公司 | Automatic intelligent power distribution system and power distribution method |
| CN103259276B (en) * | 2013-06-04 | 2016-03-30 | 长沙高升电子电器科技有限公司 | Automated intelligent distribution system and distribution method |
| CN103354361A (en) * | 2013-06-19 | 2013-10-16 | 国家电网公司 | Low-voltage three-phase load automation balancing device |
| CN104201703A (en) * | 2014-09-04 | 2014-12-10 | 湖北追日电气股份有限公司 | Method for solving problem of three-phase unbalance of bi-direction charge/discharge machine |
| CN104752968A (en) * | 2014-12-01 | 2015-07-01 | 宁波天顺电气有限公司 | Power box with dual power supplies |
| WO2023001378A1 (en) * | 2021-07-22 | 2023-01-26 | Hitachi Energy Switzerland Ag | Hybrid phase selector |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200804 Address after: Room 1104 / 1105, 11 / F, building 4, yinneng Huanghe homestead, 67 Beibinhe West Road, Anning District, Lanzhou City, Gansu Province Patentee after: Gansu Yulong Chuangxing Electric Power Technology Service Co., Ltd Address before: 212003 Jintai building, private economic development zone, Jiangsu, Zhenjiang 408 Patentee before: ZHENJIANG CHANGHE ELECTRIC POWER TECHNOLOGY Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20201105 |
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| CF01 | Termination of patent right due to non-payment of annual fee |