CN205583705U - Three -phase unbalanced load adjusting device's major loop - Google Patents
Three -phase unbalanced load adjusting device's major loop Download PDFInfo
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- CN205583705U CN205583705U CN201620375581.1U CN201620375581U CN205583705U CN 205583705 U CN205583705 U CN 205583705U CN 201620375581 U CN201620375581 U CN 201620375581U CN 205583705 U CN205583705 U CN 205583705U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The utility model discloses a three -phase unbalanced load adjusting device's major loop, insert branch road and commutation transition branch road including the load. The load inserts four controllable switch K11 of route, K12, K13, K14 and an access load and forms, a commutation transition three controllable switch K21 of route, K22, K23 and three fast switch S1, S2, S3 form. When three -phase unbalanced load produces, the switching of intelligent control ware control this major loop controllable switch and fast switch, can the automatic switch -over load insert electric power system's phase line, make three phase loads tend to balance, switch the in -process, mistake electricity time of load is by the switching time decision of fast switch, it is steerable within 10 milliseconds, do not influence general domestic appliance's normal use, consequently can think and not have the outage in the three -phase unbalanced load adjustment procedure, and the in -process is switched to the phase line at the fast switch, impulse current to the load is zero.
Description
Technical field
This utility model relates to the circuit structure of three-phase load unbalance adjusting apparatus, particularly relates to the major loop of a kind of three-phase load unbalance adjusting apparatus.
Background technology
In the upgrading of rural power grids, take and such as distribution transformer is arranged on load center, shorten the measure such as radius of electricity supply, selection larger sectional area wire, significantly improve rural low voltage network situation, construct a good electrical network " hardware ".
After the upgrading of rural power grids and " same price and grid " are implemented, substantial amounts of high-power household electrical appliance enter common people house, cause single-phase load to increase sharply, and the problem of three-phase load unbalance is increasingly severe, causes operation of power networks situation to be deteriorated.Three-phase load unbalance, a phase or biphase abnormal heavy, the voltage drop of circuit will be increased, reduce the quality of voltage of user, affect the production of user, household electricity；When three-phase current unbalance degree is bigger, the zero-sequence current produced is the biggest, the most even can blow system zero line, make load neutral point to the big phase shift of load, the phase voltage that load is big reduces, the phase voltage that load is little then can raise, if the voltage after Sheng Gaoing substantially exceeds the rated voltage of low-voltage electrical apparatus, then can cause the accident that a large amount of household electrical appliance of user burn；Three-phase load unbalance, makes transformator and low voltage electric network loss increase, transformator and circuit can be caused to burn because heating is serious, on the one hand power supply cost is increased, on the other hand interruption maintenance can cause long-time power failure, reduces power supply reliability, have impact on the economic benefit of power supply enterprise.
Current domestic solution this problem of low-voltage distribution network three-phase load unbalance, it is common that use manual switching single-phase load to power the mode of phase, but this method also exists certain limitation.On the one hand, owing to load variations is frequent, needs often to switch adjustment, add human cost；On the other hand, manual switching needs configuration load monitoring device, to guarantee the correctness of load commutation, and needs during commutation first to have a power failure load to operate again, and the power off time of load often to have had a strong impact on the normal electricity consumption of user more than 30 minutes.
This utility model is for above-mentioned situation, devise the major loop of a kind of three-phase load unbalance adjusting apparatus, when load unbalanced generation, intelligent controller controls major loop gate-controlled switch and the switching of high-speed switch, automatic switchover single-phase load accesses the phase line of power system, and three-phase load can be made to tend to balance.In handoff procedure, the dead electricity time of single-phase load was determined by the switching time of high-speed switch, within caning be controlled in 10 milliseconds, did not affect the normal use of general household electrical appliance, it can be considered that load switching process is without power-off.
Summary of the invention
Goal of the invention of the present utility model is to provide the major loop of a kind of novel topological structure for three-phase load unbalance adjusting apparatus, when three-phase load unbalance produces, intelligent controller controls this major loop gate-controlled switch and the switching of high-speed switch, the load that can automatically switch accesses the phase line of power system, three-phase load is made to tend to balance, in handoff procedure, the dead electricity time of load was determined by the switching time of high-speed switch, within caning be controlled in 10 milliseconds, do not affect the normal use of general household electrical appliance, it can be considered that without power-off during three-phase load unbalance adjustment, and in the phase line handoff procedure of high-speed switch, dash current to load is zero.
This utility model realizes its goal of the invention especially by following technological means: the major loop of a kind of three-phase load unbalance adjusting apparatus, including load access leg and commutation transition branch road.Described load access leg is accessed load by four gate-controlled switches K11, K12, K13, K14 and one and forms, first end of described access load is connected with the zero line N of three-phase four-wire system distribution line, and the second end of described access load is connected with phase line A, B, C and COM end of three-phase four-wire system distribution line by described four gate-controlled switches K11, K12, K13, K14 respectively；Three gate-controlled switches K21, K22, K23 of route and three high-speed switch S1, S2, S3 compositions are propped up in described commutation transition, first end of described three high-speed switches S1, S2, S3 is all connected with COM end respectively, and the second end is connected with phase line A, B, C of three-phase four-wire system distribution line by three gate-controlled switches K21, K22, K23 respectively；Described COM end is in the not charged common port within device；Described load access leg can be single loop, it is also possible to be to be made up of multiple identical branch roads.
As optional embodiment of the present utility model: described controllable switch element is magnetic latching relay, and it is little that magnetic latching relay has volume, it is suitable for PCB and installs；Low in energy consumption, load capacity is strong；Safe and reliable, service life, the feature such as length, can reduce energy loss during load switching, it is ensured that the service life in whole loop.
As optional embodiment of the present utility model: described high-speed switch element is silicon controlled module, described silicon controlled module is made up of the controllable silicon of two reverse parallel connections, controllable silicon reaction is fast, it is swift in motion, triggering burst length during conducting is accurately controlled Millisecond, therefore can realize the load switching time and control within 10 milliseconds.
As optional embodiment of the present utility model: described high-speed switch element is IGBT, IGBT is that full-control type voltage drives semiconductor switch, it turns on and off and all can control, driving power is little, saturation pressure reduces, can work at still higher frequencies, therefore the control accuracy of load switching process is higher.
Relative to prior art, this utility model has the advantages that
1) when three-phase load unbalance produces, intelligent controller controls this major loop gate-controlled switch and the switching of high-speed switch, the load that can automatically switch accesses the phase line of power system, three-phase load is made to tend to balance, thus reduce line loss and the transformer loss that three characteristics of the middle term imbalance is brought, reach the purpose of saving energy and decreasing loss.
2), within the time of load switching process can be controlled in 10 milliseconds, do not affect the normal use of general household electrical appliance, it can be considered that three-phase load unbalance adjust during without power-off.
3) in the phase line handoff procedure of high-speed switch, the dash current to load is zero.
Accompanying drawing explanation
Fig. 1 is the main loop circuit schematic diagram of the three-phase load unbalance adjusting apparatus of this utility model preferred embodiment.
Detailed description of the invention
As shown in Figure 1, the major loop of the three-phase load unbalance adjusting apparatus of the present embodiment includes a load access leg 10 and a commutation transition branch road 20, described load access leg 10 includes four magnetic latching relays K11, K12, K13, K14, load L1 is accessed with one, described commutation transition branch road 20 includes three magnetic latching relays K21, K22, K23, with three groups of silicon controlled modules S1, S2, S3, described three groups of silicon controlled modules S1, S2, S3 are respectively by the controllable silicon composition of two reverse parallel connections.
In Fig. 1, A, B, C are three-phase alternating current electric wire, and N is zero line, and COM is the internal uncharged common port of device.In load access leg 10, the first end accessing load L1 is connected with zero line N, the second end accessing load L1 is connected with first end of four magnetic latching relays K11, K12, K13, K14 respectively, second end of magnetic latching relay K11 is connected with phase line A, second end of magnetic latching relay K12 is connected with phase line B, second end of magnetic latching relay K13 is connected with phase line C, and second end of magnetic latching relay K14 uncharged common port COM internal with device is connected.In commutation transition branch road 20, all the most internal with the device uncharged common port COM of first end of silicon controlled module S1, S2, S3 is connected, second end of silicon controlled module S1 is connected with phase line A by magnetic latching relay K21, second end of silicon controlled module S2 is connected with phase line B by magnetic latching relay K22, and second end of silicon controlled module S3 is connected with phase line C by magnetic latching relay K23.
The operation principle of the present embodiment is as follows: being originally connected in phase line A if accessing load L1, then magnetic latching relay K11 Guan Bi, other magnetic latching relay and silicon controlled module all disconnect.When distribution system A phase load is heavier, B phase load is lighter, need from A phase, access load L1 is switched to B phase time, then carry out following a series of switch motion: first, the magnetic latching relay K14 of closed load access leg 10 and magnetic latching relay K21, K22 of commutation transition branch road 20, controller sends the triggering pulse of silicon controlled module S1, makes S1 turn on, now, access load L1 to be powered by the A phase line of load access leg 10 and the A phase line of commutation transition branch road 20 simultaneously.Then, disconnect the magnetic latching relay K11 of load access leg 10, load L1 is made only to be powered by the A phase line of commutation transition branch road 20, it follows that controller stops sending the triggering pulse of silicon controlled module S1, after being spaced 1 ac cycle, while controllable silicon S1 turns off, controller sends the triggering pulse of controllable silicon S2, makes S2 turn on, and now load L1 is only powered by the B phase line of commutation transition branch road 20；S1 turn off S2 conducting transit time be 1/3 ac cycle, the about 7ms time, be significantly less than the response time of load, it can be considered that load does not has power-off during this.Next, the magnetic latching relay K12 of closed load access leg 10, now, load L1 is powered by the B phase line of load access leg 10 and the B phase line of commutation transition branch road 20 simultaneously, postpone 3 ac cycles, after circuit stability, controller stops sending the triggering pulse of controllable silicon S2, S2 is made to turn off, postpone 1 ac cycle again, disconnect magnetic latching relay K21 and K22 of commutation transition branch road 20, and the magnetic latching relay K14 of load access leg 10, now access load L1 and complete the overall process being switched to B phase from A phase.
If accessing load L1 to be originally connected in phase line B, then magnetic latching relay K12 Guan Bi, other magnetic latching relay and silicon controlled module all disconnect.When distribution system B phase load is heavier, C phase load is lighter, need from B phase, access load L1 is switched to C phase time, then carry out following a series of switch motion: first, the magnetic latching relay K14 of closed load access leg 10 and magnetic latching relay K22, K23 of commutation transition branch road 20, controller sends the triggering pulse of silicon controlled module S2, makes S2 turn on, now, access load L1 to be powered by the B phase line of load access leg 10 and the B phase line of commutation transition branch road 20 simultaneously.Then, disconnect the magnetic latching relay K12 of load access leg 10, load L1 is made only to be powered by the B phase line of commutation transition branch road 20, it follows that controller stops sending the triggering pulse of silicon controlled module S2, after being spaced 1 ac cycle, while controllable silicon S2 turns off, controller sends the triggering pulse of controllable silicon S3, makes S3 turn on, and now load L1 is only powered by the C phase line of commutation transition branch road 20；S2 turn off S3 conducting transit time be 1/3 ac cycle, the about 7ms time, be significantly less than the response time of load, it can be considered that load does not has power-off during this.Next, the magnetic latching relay K13 of closed load access leg 10, now, load L1 is powered by the C phase line of load access leg 10 and the C phase line of commutation transition branch road 20 simultaneously, postpones 3 ac cycles, after circuit stability, controller stops sending the triggering pulse of controllable silicon S3, makes S3 turn off, then postpones 1 ac cycle, disconnect magnetic latching relay K22 and K23 of commutation transition branch road 20, now access load L1 and complete the overall process being switched to C phase from B phase.
If accessing load L1 to be originally connected in phase line A, then magnetic latching relay K11 Guan Bi, other magnetic latching relay and silicon controlled module all disconnect.When distribution system A phase load is heavier, C phase load is lighter, need from A phase, access load L1 is switched to C phase time, then carry out following a series of switch motion: first, the magnetic latching relay K14 of closed load access leg 10 and magnetic latching relay K21, K23 of commutation transition branch road 20, controller sends the triggering pulse of silicon controlled module S1, makes S1 turn on, now, access load L1 to be powered by the A phase line of load access leg 10 and the A phase line of commutation transition branch road 20 simultaneously.Then, disconnect the magnetic latching relay K11 of load access leg 10, load L1 is made only to be powered by the A phase line of commutation transition branch road 20, it follows that controller stops sending the triggering pulse of silicon controlled module S1, after being spaced 1 ac cycle, while controllable silicon S1 turns off, controller sends the triggering pulse of controllable silicon S3, makes S3 turn on, and now load L1 is only powered by the C phase line of commutation transition branch road 20；S1 turn off S3 conducting transit time be 1/3 ac cycle, the about 7ms time, be significantly less than the response time of load, it can be considered that load does not has power-off during this.Next, the magnetic latching relay K13 of closed load access leg 10, now, load L1 is powered by the C phase line of load access leg 10 and the C phase line of commutation transition branch road 20 simultaneously, postpones 3 ac cycles, after circuit stability, controller stops sending the triggering pulse of controllable silicon S3, makes S3 turn off, then postpones 1 ac cycle, disconnect magnetic latching relay K21 and K23 of commutation transition branch road 20, now access load L1 and complete the overall process being switched to C phase from A phase.
The handoff procedure of other phase line of load is similar with above-mentioned operation principle.The major loop of three-phase load unbalance adjusting apparatus disclosed in this utility model, by controlling this major loop gate-controlled switch and the switching of high-speed switch, the load that can automatically switch accesses the phase line of power system, three-phase load is made to tend to balance, thus reduce line loss and the transformer loss that three characteristics of the middle term imbalance is brought, reach the purpose of saving energy and decreasing loss；Within the time of load switching process can be controlled in 10 milliseconds, do not affect the normal use of general household electrical appliance, it can be considered that without power-off during three-phase load unbalance adjustment；In the phase line handoff procedure of high-speed switch, the dash current to load is zero.
Claims (5)
1. the major loop of a three-phase load unbalance adjusting apparatus, it is characterized in that: include load access leg and commutation transition branch road, described load access leg is accessed load by four gate-controlled switches K11, K12, K13, K14 and one and forms, first end of described access load is connected with the zero line N of three-phase four-wire system distribution line, and the second end of described access load is connected with phase line A, B, C and COM end of three-phase four-wire system distribution line by described four gate-controlled switches K11, K12, K13, K14 respectively；Three gate-controlled switches K21, K22, K23 of route and three high-speed switch S1, S2, S3 compositions are propped up in described commutation transition, first end of described three high-speed switches S1, S2, S3 is all connected with COM end respectively, and the second end is connected with phase line A, B, C of three-phase four-wire system distribution line by three gate-controlled switches K21, K22, K23 respectively；Described COM end is in the not charged common port within device；Described load access leg is single loop or is made up of multiple identical branch roads.
The major loop of three-phase load unbalance adjusting apparatus the most according to claim 1, it is characterised in that: high-speed switch turns off transit time that another high-speed switch turns on less than 1/2 ac cycle.
The major loop of three-phase load unbalance adjusting apparatus the most according to claim 2, it is characterised in that: above-mentioned transit time is 1/3 ac cycle.
The major loop of three-phase load unbalance adjusting apparatus the most according to claim 1, it is characterised in that: described high-speed switch is the silicon controlled module of two reverse parallel connections.
The major loop of three-phase load unbalance adjusting apparatus the most according to claim 1, it is characterised in that: described high-speed switch is IGBT.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620375581.1U CN205583705U (en) | 2016-04-29 | 2016-04-29 | Three -phase unbalanced load adjusting device's major loop |
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| CN201620375581.1U CN205583705U (en) | 2016-04-29 | 2016-04-29 | Three -phase unbalanced load adjusting device's major loop |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528332A (en) * | 2017-08-19 | 2017-12-29 | 国网山东省电力公司青州市供电公司 | Three-phase load adjusting apparatus and production and preparation method thereof |
| CN107846031A (en) * | 2017-10-30 | 2018-03-27 | 柳州职业技术学院 | A kind of three-phase load automatic balancing arrangement |
| CN110061490A (en) * | 2018-01-18 | 2019-07-26 | 贾继莹 | A kind of single-phase load dynamic distribution system controller |
| CN111044893A (en) * | 2019-12-12 | 2020-04-21 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
| CN112067930A (en) * | 2020-09-14 | 2020-12-11 | 广东电网有限责任公司电力科学研究院 | Method and device for judging overload type of distribution transformer, medium and terminal equipment |
-
2016
- 2016-04-29 CN CN201620375581.1U patent/CN205583705U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107528332A (en) * | 2017-08-19 | 2017-12-29 | 国网山东省电力公司青州市供电公司 | Three-phase load adjusting apparatus and production and preparation method thereof |
| CN107528332B (en) * | 2017-08-19 | 2020-08-21 | 国网山东省电力公司青州市供电公司 | Three-phase load adjustment device and methods of making and using same |
| CN107846031A (en) * | 2017-10-30 | 2018-03-27 | 柳州职业技术学院 | A kind of three-phase load automatic balancing arrangement |
| CN110061490A (en) * | 2018-01-18 | 2019-07-26 | 贾继莹 | A kind of single-phase load dynamic distribution system controller |
| CN111044893A (en) * | 2019-12-12 | 2020-04-21 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
| CN111044893B (en) * | 2019-12-12 | 2020-11-13 | 云南电网有限责任公司临沧供电局 | System and method for measuring load response time of phase change switch |
| CN112067930A (en) * | 2020-09-14 | 2020-12-11 | 广东电网有限责任公司电力科学研究院 | Method and device for judging overload type of distribution transformer, medium and terminal equipment |
| CN112067930B (en) * | 2020-09-14 | 2021-09-10 | 广东电网有限责任公司电力科学研究院 | Method and device for judging overload type of distribution transformer, medium and terminal equipment |
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