CN205583704U - Not balancing control system of change secondary side is joined in marriage in low district of presenting a theatrical performance as last item on a programme - Google Patents
Not balancing control system of change secondary side is joined in marriage in low district of presenting a theatrical performance as last item on a programme Download PDFInfo
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- CN205583704U CN205583704U CN201620375518.8U CN201620375518U CN205583704U CN 205583704 U CN205583704 U CN 205583704U CN 201620375518 U CN201620375518 U CN 201620375518U CN 205583704 U CN205583704 U CN 205583704U
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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 utility model discloses a not balancing control system of change secondary side is joined in marriage in low district of presenting a theatrical performance as last item on a programme, including three current transformer, main website of system, one or more system slave station, processing unit, central processing unit, memory cell, instruction generation unit and first communication unit constitute the main website of system in advance by electric current signal acquisition element, signal, the inner structure of one or more system slave station is the same, by load switch unit, drive unit, signal processing unit to and the second newsletter unit constitutes, platform district's data interaction network is establish to the all electric power carrier wave communication's of mistake of this department mode, and the real -time supervision of main website of system joins in marriage the three phase current value that becomes the secondary side, calculation unbalanced three phase degree, and when it surpassed standard requirements, the main website sent the load to each slave station and switches the instruction, made the access load of each slave station carry out the switching of appropriate phase line, went up heavily loaded looks load transfer mutually to the underloading to reduce and join in marriage the unbalanced three phase degree that becomes the secondary side, reduce the zero line electric current of joining in marriage the change in the platform district.
Description
Technical field
This utility model relates to low voltage electric network electric and electronic technical field, particularly relates to a kind of low-voltage platform area distribution transforming secondary side imbalance and adjusts system.
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, for above-mentioned situation, devises a kind of low-voltage platform area distribution transforming secondary side imbalance and adjusts system, and this system has the ability of power line carrier, PLC, can set up data interaction network in power distribution station.The current value of system real-time control and monitor console district Circuit Fault on Secondary Transformer three-phase load, and calculate the instantaneous value of tri-phase unbalance factor, when the tri-phase unbalance factor of Circuit Fault on Secondary Transformer exceeds the requirement of standard, system main website can send instruction by power line carrier, PLC to each system slave station, after each system slave station receives the instruction of main website, carrying out suitable load phase line switching, after making adjustment, the tri-phase unbalance factor of Circuit Fault on Secondary Transformer reduces, and Circuit Fault on Secondary Transformer neutral line current reduces.In handoff procedure, the dead electricity time of single-phase load was determined by the switching time switched, (according to GB/T30137-2013 within caning be controlled in 10 milliseconds, Voltage Drop within 10 milliseconds is not considered as voltage termination), do not affect the normal use of general household electrical appliance, it can be considered that load switching process is without power-off.In low voltage electric network, adjust system by low-voltage platform area distribution transforming secondary side imbalance and the three-phase imbalance of platform change secondary side is adjusted being a kind of effective manner with low cost and direct have the highest feasibility and higher economic benefit.
Summary of the invention
Goal of the invention of the present utility model is a kind of automatic adjustment system of distribution transformer secondary side out-of-balance current offer for low-voltage platform area, this system sets up data interaction network in platform district by the way of power carrier communication, system main website can monitor the three-phase electricity flow valuve of distribution transforming secondary side in real time, calculate and store the instantaneous value of tri-phase unbalance factor, when degree of unbalancedness is beyond the requirement of standard, main website sends load switching instruction to each slave station, the load that accesses making each slave station carries out suitable phase line switching, heavy duty phase load is transferred to underloading go up mutually, thus reduce the tri-phase unbalance factor of platform district distribution transforming secondary side, reduce the neutral line current of platform district distribution transforming.In handoff procedure, the dead electricity time of single-phase load was determined by the switching time switched, (according to GB/T30137-2013 within caning be controlled in 10 milliseconds, Voltage Drop within 10 milliseconds is not considered as voltage termination), do not affect the normal use of general household electrical appliance, it can be considered that load switching process is without power-off, and in the phase line handoff procedure of switch, dash current to load is zero, it is ensured that load runs safely and reliably.
This utility model realizes its goal of the invention especially by following technological means: a kind of low-voltage platform area distribution transforming secondary side imbalance adjusts system, including three current transformers, system main website, one or more system slave stations；Described system main website is made up of current signal collecting unit, Signal Pretreatment unit, CPU, memory element, instruction signal generating unit and the first communication unit；The internal structure of the one or more system slave station is identical, is constituted by load switching unit, driver element, signal processing unit, and the second communication unit；Described system main website is installed on the position near platform district distribution transformer secondary side line outlet, described system slave station is installed on the position of platform district load Relatively centralized, remote data communication is carried out, it is established that the data interaction network in platform district between first communication unit and second communication unit of described system slave station of described system main website；Described three current transformers are installed on secondary side A, B, C three-phase alternating current line outlet of platform district distribution transformer, the real-time current value of detection three-phase alternating current outlet, and the current signal of detection is sent to the described current signal collecting unit of described system main website；The leading-out terminal of described system slave station accesses a number of load, and end of incoming cables is connected with three-phase alternating current A, B, C and the zero line N of distribution system.
nullThe current signal received is sent to described Signal Pretreatment unit by described current signal collecting unit，Through impedance transformation、Power amplification、Level conversion、Filtering、After a series of process such as correction，Transmit signals to described CPU be analyzed calculating，When the tri-phase unbalance factor calculated exceedes setting numerical value，Described CPU will carry out a series of control decision analysis，Switch motion situation according to the multiple described system slave station that described first communication unit receives，Load quantity，Payload and load access the situations such as phase line，Select optimal system slave station、Select optimum step switch、Determine optimized switching action sequence、And calculate tri-phase unbalance factor after adjustment，And the historical record of current value of calculation with described memory element is compared，When after the adjustment calculated, tri-phase unbalance factor reduces，Described CPU sends control signal，Output is to described instruction signal generating unit，And send instruction by described first communication unit to described second communication unit，Optimal system slave station is specified to select step switch according to instruction，Load commutation is carried out according to the action sequence in instruction；After described second communication unit receives instruction, send it to described signal processing unit, carry out power amplification, level conversion, signal condition, a series of process such as signal isolation, again the on-off model of generation is sent to described driver element, be converted to be suitable for the start pulse signal of switch motion, drive the described corresponding switch motion of load switching unit, carry out load commutation；Described signal processing unit is by the switch motion situation of described load switching unit, load quantity, payload and load access the situations such as phase line and are sent to described second communication unit, and pass to described first communication unit by data interaction, are resent to described CPU.
As optional embodiment of the present utility model: carry out remote data communication between the first communication unit and second communication unit of described system slave station of described system main website, the mode of communication is power line carrier, PLC, power line carrier, PLC is a kind of specific communication mode utilizing low-voltage distribution wire to carry out data transmission as information transmitting medium, the sharpest edges of this technology are to rely on power line network, need not rewiring, there is the features such as construction, operating cost is low.
As optional embodiment of the present utility model: the load switching unit of described system slave station is made up of load switching module and multiple load AM access module；Described load AM access module is made up of four gate-controlled switches, for the access steady in a long-term of load；Described load switching module is made up of three high-speed switches and three gate-controlled switches, for the commutation transition of load；The reaction of high-speed switch element is fast, it is swift in motion, triggering burst length during conducting is accurately controlled Millisecond, can realize the load switching time controls within 10 milliseconds, do not affect the normal use of general household electrical appliance, it can be considered that load switching process is without power-off, and in the phase line handoff procedure of switch, dash current to load is zero, it is ensured that load runs safely and reliably.
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 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) this system can monitor low-voltage platform area distribution transformer secondary side electrical network three-phase electricity flow valuve in real time, calculates and store the instantaneous value of degree of unbalancedness.
2) when platform district distribution transforming degree of unbalancedness or transformator neutral line current exceed the requirement of standard, system main website sends load switching instruction to each system slave station, the load that accesses making each slave station carries out suitable phase line switching, heavy duty phase load is transferred to underloading go up mutually, thus reduce the tri-phase unbalance factor of platform district distribution transforming secondary side, reduce the neutral line current of platform district distribution transforming, reduce transformer loss, reach the purpose of saving energy and decreasing loss.
3) in handoff procedure, the dead electricity time of single-phase load was determined by the switching time switched, (according to GB/T30137-2013 within caning be controlled in 10 milliseconds, Voltage Drop within 10 milliseconds is not considered as voltage termination), do not affect the normal use of general household electrical appliance, it can be considered that load switching process is without power-off.
4) in the phase line handoff procedure of high-speed switch, the dash current to load is zero.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the low-voltage platform area distribution transforming secondary side imbalance adjustment system of this utility model preferred embodiment.
Detailed description of the invention
As it is shown in figure 1, the low-voltage platform area distribution transforming secondary side imbalance of the present embodiment adjusts system includes three Current Transmits 1, CT2, CT3, system main website, system slave station 1 and system slave station 2.Described system main website is made up of current signal collecting unit, Signal Pretreatment unit, CPU, memory element, instruction signal generating unit and communication unit 0；Described system slave station 1 is made up of load switching unit 1, driver element 1, signal processing unit 1, and communication unit 1；Described system slave station 2 is made up of load switching unit 2, driver element 2, signal processing unit 2, and communication unit 2；Described system slave station 1 is identical with the internal structure of described system slave station 2.Described system main website is installed on the position near platform district distribution transformer secondary side line outlet, described system slave station is installed on the position of platform district load Relatively centralized, remote data communication is carried out, it is established that the data interaction network in platform district between communication unit 0 and the communication unit 2 of the communication unit 1 of described system slave station 1 and described system slave station 2 of described system main website；Described three Current Transmits 1, CT2, CT3 are installed on secondary side A, B, C three-phase alternating current line outlet of platform district distribution transformer, the real-time current value of detection Three-Phase Transformer exchange outlet, and the current signal of detection is sent to the described current signal collecting unit of described system main website；The leading-out terminal of described system slave station 1 accesses 6 road loads: load 1, load 2, load 3, load 4, load 5, load 6, end of incoming cables is connected with three-phase alternating current A, B, C and the zero line N of distribution system；The leading-out terminal of described system slave station 2 accesses 6 road loads: load 7, load 8, load 9, load 10, load 11, load 12, end of incoming cables is connected with three-phase alternating current A, B, C and the zero line N of distribution system.
nullDescribed current signal collecting unit sends the three-phase alternating current signal received to described Signal Pretreatment unit，Through impedance transformation、Power amplification、Level conversion、Filtering、After a series of process such as correction，Transmit signals to described CPU be analyzed calculating，When the tri-phase unbalance factor calculated exceedes setting numerical value，Described CPU will carry out a series of control decision analysis，Switch motion situation according to the multiple described system slave station that described first communication unit receives，Load quantity，Payload and load access the situations such as phase line，Select optimal system slave station、Select optimum step switch、Determine optimized switching action sequence、And calculate tri-phase unbalance factor after adjustment，And the historical record of current value of calculation with described memory element is compared，When after the adjustment calculated, tri-phase unbalance factor reduces，Described CPU sends control signal，Output is to described instruction signal generating unit，And send instruction by described communication unit 0 to described communication unit 1 and described communication unit 2，Optimal system slave station is specified to select step switch according to instruction，Load commutation is carried out according to the action sequence in instruction；After described communication unit 1 receives instruction, send it to described signal processing unit 1, carry out power amplification, level conversion, signal condition, a series of process such as signal isolation, the on-off model of generation is sent to described driver element 1 again, be converted to be suitable for the start pulse signal of switch motion, drive the described corresponding switch motion of load switching unit 1, carry out load commutation；Described signal processing unit 1 is by the switch motion situation of described load switching unit 1, load quantity, payload and load access the situations such as phase line and are sent to described communication unit 1, and pass to described communication unit 0 by data interaction, are resent to described CPU.After described communication unit 2 receives instruction, send it to described signal processing unit 2, carry out power amplification, level conversion, signal condition, a series of process such as signal isolation, the on-off model of generation is sent to described driver element 2 again, be converted to be suitable for the start pulse signal of switch motion, drive the described corresponding switch motion of load switching unit 2, carry out load commutation；Described signal processing unit 2 is by the switch motion situation of described load switching unit 2, load quantity, payload and load access the situations such as phase line and are sent to described communication unit 2, and pass to described communication unit 0 by data interaction, are resent to described CPU.
The operation principle of the present embodiment is as follows: assume 12 road loads of low-voltage platform area, and size is respectively as follows: load 1=60A, load 2=30A, load 3=50A, load 4=10A, load 5=10A, load 6=10A, load 7=80A, load 8=20A, load 9=70A, load 10=30A, load 11=20A, load 12=10A；Load 1, load 2, load 7, load 8 access A phase, and load 3, load 4, load 9, load 10 access B phase, and load 5, load 6, load 11, load 12 access C phase；Now the secondary side current of platform district distribution transformer is respectively A phase 190A, B phase 160A, C phase 50A.
Described current signal collecting unit sends the three-phase alternating current signal received to described Signal Pretreatment unit, through impedance transformation, power amplification, level conversion, filter, after a series of process such as correction, transmit signals to described CPU be analyzed calculating, the tri-phase unbalance factor calculated is 42.9%, it is stored in the memory element of system main website, requirement according to GB GB50052 relevant provision, tri-phase unbalance factor should be less than 15%, tri-phase unbalance factor the most now is unsatisfactory for standard-required, needs to adjust.
nullSystem slave station 1 that the CPU of system main website receives according to communication unit 0 and the switch motion situation of system slave station 2，Load quantity，Payload and load access the situations such as phase line，Select from A phase, the load 2 of system slave station 1 is switched to C phase，The load 4 of system slave station 1 is switched to C phase from A phase，The load 8 of system slave station 2 is switched to C phase from A phase，The load 10 of system slave station 2 is switched to C phase from A phase，After calculating adjustment, three-phase imbalance angle value is 5.3%，The historical record of current value of calculation with described memory element is compared，After understanding the adjustment calculated, tri-phase unbalance factor reduces，Now CPU sends control signal，Instruction signal generating unit is given in output，And send instruction by communication unit 0 to communication unit 1 and communication unit 2，Appointing system slave station and system slave station 2 select step switch according to instruction，Load commutation is carried out according to the action sequence in instruction；After the communication unit 1 of system slave station 1 receives instruction, send it to signal processing unit 1, carry out power amplification, level conversion, signal condition, a series of process such as signal isolation, again the on-off model of generation is sent to driver element 1, is converted to be suitable for the start pulse signal of switch motion, drives the corresponding switch motion of load switching unit 1, load 2 is switched to C phase from A phase, load 4 is switched to C phase from A phase；The switch motion situation of load switching unit 1, load quantity, payload and load are accessed the situations such as phase line and are sent to communication unit 1 by signal processing unit 1, and pass to communication unit 0 by data interaction, are resent to the CPU of system main website；After the communication unit 2 of system slave station 2 receives instruction, send it to signal processing unit 2, carry out power amplification, level conversion, signal condition, a series of process such as signal isolation, again the on-off model of generation is sent to driver element 2, is converted to be suitable for the start pulse signal of switch motion, drives the corresponding switch motion of load switching unit 2, load 8 is switched to C phase from A phase, load 10 is switched to C phase from A phase；The switch motion situation of load switching unit 2, load quantity, payload and load are accessed the situations such as phase line and are sent to communication unit 2 by signal processing unit 2, and pass to communication unit 0 by data interaction, are resent to CPU.Now complete the once adjustment process of whole system.
The three-phase current of the background partition Circuit Fault on Secondary Transformer of adjustment is respectively A phase 140A, B phase 120A, C phase 140A, and tri-phase unbalance factor is substantially reduced, and transformator neutral line current reduces, and transformer loss greatly reduces.
This system can monitor low-voltage platform area distribution transformer secondary side electrical network three-phase electricity flow valuve in real time, calculates and store the instantaneous value of degree of unbalancedness；When platform district distribution transforming degree of unbalancedness or transformator neutral line current exceed the requirement of standard, system main website sends load switching instruction to each system slave station, the load that accesses making each slave station carries out suitable phase line switching, heavy duty phase load is transferred to underloading go up mutually, thus reduce the tri-phase unbalance factor of platform district distribution transforming secondary side, reduce the neutral line current of platform district distribution transforming, reduce transformer loss, reach the purpose of saving energy and decreasing loss；In handoff procedure, the dead electricity time of single-phase load was determined by the switching time switched, (according to GB/T30137-2013 within caning be controlled in 10 milliseconds, Voltage Drop within 10 milliseconds is not considered as voltage termination), do not affect the normal use of general household electrical appliance, it can be considered that load switching process is without power-off；In the phase line handoff procedure of high-speed switch, the dash current to load is zero.
Claims (7)
1. low-voltage platform area distribution transforming secondary side imbalance adjusts a system, including three current transformers, system main website, one or more system slave stations；Described system main website is made up of current signal collecting unit, Signal Pretreatment unit, CPU, memory element, instruction signal generating unit and the first communication unit；The internal structure of the one or more system slave station is identical, is constituted by load switching unit, driver element, signal processing unit, and the second communication unit；Described system main website is installed on the position near platform district distribution transformer secondary side line outlet, described system slave station is mounted on the position of platform district load Relatively centralized, remote data communication is carried out, it is established that the data interaction network in platform district between first communication unit and second communication unit of described system slave station of described system main website；Described three current transformers are installed on secondary side A, B, C three-phase alternating current line outlet of platform district distribution transformer, the real-time current value of detection three-phase alternating current outlet, and the current signal of detection is sent to the described current signal collecting unit of described system main website；The leading-out terminal of described system slave station accesses load, and end of incoming cables is connected with three-phase alternating current A, B, C and the zero line N of distribution system.
Distribution transforming secondary side imbalance in low-voltage platform area the most according to claim 1 adjusts system, it is characterised in that: the load switching unit of described system slave station is made up of load switching module and multiple load AM access module；Described load AM access module is respectively by four gate-controlled switch compositions, for the access steady in a long-term of load；Described load switching module is made up of three high-speed switches and three gate-controlled switches, for the commutation transition of load；High-speed switch reaction is fast, it is swift in motion, triggering burst length during conducting is accurately controlled Millisecond, can realize the load switching time controls within 10 milliseconds, load switching process is without power-off, and in the phase line handoff procedure of switch, the dash current to load is zero, it is ensured that load runs safely and reliably.
Distribution transforming secondary side imbalance in low-voltage platform area the most according to claim 1 adjusts system, it is characterized in that: carrying out remote data communication between the first communication unit and second communication unit of described system slave station of described system main website, the mode of communication is power line carrier, PLC.
Distribution transforming secondary side imbalance in low-voltage platform area the most according to claim 1 adjusts system, it is characterised in that: the leading-out terminal of described system slave station accesses the quantity of load more than 3.
Distribution transforming secondary side imbalance in low-voltage platform area the most according to claim 4 adjusts system, it is characterised in that: the quantity of above-mentioned access load is 6.
Distribution transforming secondary side imbalance in low-voltage platform area the most according to claim 2 adjusts system, it is characterised in that: described gate-controlled switch is magnetic latching relay.
Distribution transforming secondary side imbalance in low-voltage platform area the most according to claim 2 adjusts system, it is characterised in that: described high-speed switch is IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620375518.8U CN205583704U (en) | 2016-04-29 | 2016-04-29 | Not balancing control system of change secondary side is joined in marriage in low district of presenting a theatrical performance as last item on a programme |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620375518.8U CN205583704U (en) | 2016-04-29 | 2016-04-29 | Not balancing control system of change secondary side is joined in marriage in low district of presenting a theatrical performance as last item on a programme |
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| CN205583704U true CN205583704U (en) | 2016-09-14 |
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| CN201620375518.8U Expired - Fee Related CN205583704U (en) | 2016-04-29 | 2016-04-29 | Not balancing control system of change secondary side is joined in marriage in low district of presenting a theatrical performance as last item on a programme |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790290A (en) * | 2016-04-29 | 2016-07-20 | 广州开能电气实业有限公司 | Unbalance adjustment system for low-voltage station area distribution transformer secondary side |
| CN107069781A (en) * | 2017-06-05 | 2017-08-18 | 泰豪科技股份有限公司 | A kind of air switch for possessing alternate load forwarding function |
| CN110445154A (en) * | 2019-08-01 | 2019-11-12 | 河北金江电气股份有限公司 | A kind of improvement three-phase imbalance power distribution cabinet |
-
2016
- 2016-04-29 CN CN201620375518.8U patent/CN205583704U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105790290A (en) * | 2016-04-29 | 2016-07-20 | 广州开能电气实业有限公司 | Unbalance adjustment system for low-voltage station area distribution transformer secondary side |
| CN107069781A (en) * | 2017-06-05 | 2017-08-18 | 泰豪科技股份有限公司 | A kind of air switch for possessing alternate load forwarding function |
| CN110445154A (en) * | 2019-08-01 | 2019-11-12 | 河北金江电气股份有限公司 | A kind of improvement three-phase imbalance power distribution cabinet |
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Granted publication date: 20160914 |