CN202840682U - Intelligent low-voltage power load allocation host - Google Patents
Intelligent low-voltage power load allocation host Download PDFInfo
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- CN202840682U CN202840682U CN 201220329537 CN201220329537U CN202840682U CN 202840682 U CN202840682 U CN 202840682U CN 201220329537 CN201220329537 CN 201220329537 CN 201220329537 U CN201220329537 U CN 201220329537U CN 202840682 U CN202840682 U CN 202840682U
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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
Disclosed is an intelligent low-voltage power load allocation host. The host is composed of a front-end conversion and switching circuit, a CPU, an RS485 interface circuit, a liquid crystal display circuit and a three-phase communication module circuit. Three voltage transformers (PT) and three current transformers (CT) of the front-end conversion and switching circuit convert distribution voltage and total output current into small signals, access the small signals to a host circuit and then to the CPU; a three-phase communication module is connected with the CPU and is connected with communication modules of branch machines through phases of a power grid; and the CPU is connected with the liquid crystal display circuit, a multi-way switch U1 and a multi-way switch U2. According to the utility model, the state of three-phase load of an intelligent low-voltage power load allocation system constituted by intelligent low-voltage power load allocation system host and branch machines is monitored in real time and loads of various intelligent low-voltage power load allocation terminals are collected and re-distributed so as to keep the three-phase load balanced. The intelligent low-voltage power load allocation host is applicable to intelligent allocation of low-voltage power loads of distribution transformers.
Description
Technical field
The utility model relates to a kind of low voltage electric load smart allocation main frame, belongs to electric power electric power system distribution power-saving technique field.
Background technology
Low voltage electric load, typically refer to exchange the 380V system with load, account for the overwhelming majority of China's electric load consumption.Exchange the 380V system and usually formed by three-phase and four-line, i.e. A phase, B phase, C phase, N phase (zero line), the load of its tape splicing has almost comprised all kinds of modern household electrical appliances and factory's electricity consumption, agricultural irrigation.
For the three phase electric machine load, when normally moving, three-phase is in poised state.Concerning residential electricity consumption, its load nearly all is single-phase.Because resident load is normally drawn from transformer with cable, when the installer installs, is difficult to know enter the separate of resident, does not more know character and the size of which load.In other words, even know the size of certain load, but because the seasonality of electricity consumption and period all can cause the payload of certain phase unpredictable, also namely be very easy to cause three-phase load uneven.Can say that low-voltage power system three-phase load absolute equilibrium is perfect condition, imbalance is normality.
Three-phase load is uneven, and the harm that brings to electric power system is very serious.First harm is that the three-phase load imbalance causes line loss to increase, and the numerical value that line loss increases becomes with electric current square to be directly proportional.In poised state, circuit Sun Hao ⊿ P=I
2R ， Qie ⊿ P
A=⊿ P
B=⊿ P
C, the total line loss ∑ of three-phase ⊿ P=3 I
2R; When system is in non-equilibrium state, suppose that the A phase load is zero, B, C two-phase have on average been shared the electric current of A phase, then ⊿ P
A=0 ， ⊿ P
B=(1.5I)
2R=2.25I
2R ， ⊿ P
C=(1.5I)
2R=2.25I
2R ， ∑ ⊿ P=4.5 I
2R, line loss has increased by 50%.Be not difficult to calculate, if the load of three-phase by a phase tape splicing, this moment ∑ ⊿ P=(3I)
2R=9I
2R, when line loss is poised state 3 of line loss times.
Three-phase load is uneven, and the second largest harm that brings to electric power system is that transformer produces additional iron losses.The network distribution transformer of the Y/Yo wiring three core limb structures that adopt more, in when, the three-phase load imbalance occuring or earth fault occurring when, its primary side non-zero-sequence current exists, secondary side has zero-sequence current to exist, therefore the zero-sequence current of secondary side is exciting current fully, the zero sequence magnetic flux that produces can not be closed in iron core, need by the oil tank wall closure, thereby heating produces iron loss in the annexes such as iron case.
Three-phase load is uneven, and the third-largest harm that brings to electric power system is to produce additional copper loss, and the additional copper loss increase can cause the transformer heating, reduces the operational efficiency of transformer.
Three-phase load is uneven, and the fourth-largest harm that brings to electric power system is to produce variation.
Therefore, invent a kind of electric load intelligent dispensing system is necessary very much, it is with real-time monitoring system three-phase load state, gather the load of each electric load smart allocation terminal (extension set) of native system subordinate, making a strategic decision, how next step redistributes load, makes three-phase load remain essentially at any time poised state.It is not only a kind of product that improves transformer operational efficiency and life-span, especially a kind of energy-conserving product.
Summary of the invention
The purpose of this utility model is, the imbalance problem that exists in order to solve low voltage electric load, can realize dynamically adjusting the size of each phase load, make system remain at state in a basic balance, improve the transformer operational efficiency, reduce line loss, the present invention proposes and discloses a kind of low voltage electric load intelligent dispensing system.
The technical solution of the utility model is, the utility model low voltage electric load smart allocation main frame is by front end conversion and commutation circuit, CPU and RS485 interface circuit, liquid crystal display circuit, three-phase communication module the electric circuit constitute.Front end conversion and commutation circuit comprise that three voltage transformers (PT), three current transformers (CT) and two 4 select 1 variable connector U1 and variable connector U2; On the three-phase of a winding access distribution transformer low-pressure side of three voltage transformers (PT), secondary winding converts the distribution output end voltage to voltage small-signal access host circuit to CPU; Three current transformers (CT) are exported total current with distribution and are converted Small Current Signal access host circuit to CPU; The three-phase communication module meets CPU, and the three-phase communication module is by linking to each other with the extension set communication module by electrical network; CPU connects liquid crystal display circuit and variable connector U1 and variable connector U2.
The beneficial effects of the utility model are, the electric load intelligent dispensing system real-time monitoring system three-phase load state that the utility model electric load intelligent dispensing system main frame and extension set consist of, gather the load of each electric load smart allocation terminal (extension set) of native system subordinate, making a strategic decision, how next step redistributes load, makes three-phase load remain essentially at any time poised state.Thereby solve the problem of power load terminal current imbalance, realize energy-conservation in the situation that do not increase generating capacity.
The utility model is applicable to the smart allocation of distribution transformer low voltage electric load.
Description of drawings
Fig. 1 is the schematic diagram that the utility model is used for the low voltage electric load intelligent dispensing system;
Fig. 2 is the front end conversion of the utility model main frame and commutation circuit;
Fig. 3 is the utility model host CPU circuit and RS-485 interface circuit;
Fig. 4 is the utility model main frame Liquid Crystal Module circuit;
Fig. 5 is the utility model main frame three-phase communication module circuit;
Fig. 6 is that the utility model main frame three communicates commutation circuit;
Symbolic representation among the figure: CT1, CT2, CT3 are the current transformers of each phase; PT1, PT3, PT3 are the voltage transformers of each phase; U1, U2, U3 two 4 select 1 variable connector; U4 is Liquid Crystal Module; U5 is the RS-485 interface chip; U6 is the CPU microprocessor; PXX1, PXX2, PXX3, PXX4 are output pins.
Embodiment
Embodiment of the present utility model such as Fig. 1 ~ shown in Figure 6.
The present embodiment low voltage electric load smart allocation main frame is by three current transformers (CT1-CT3), three voltage transformers (PT1-PT3), CPU and RS-485 interface circuit, liquid crystal display circuit, three-phase communication module the electric circuit constitute.
Current transformer (CT1-CT3) in the low voltage electric load smart allocation main frame is used for large (distribution transforming output total current) current conversion is become the element of small-signal, and its output current signal meets CPU; Voltage transformer (PT1-PT3), for the element that high voltage (distribution transforming output end voltage) is converted to small-signal, its winding connects the distribution transformer low-pressure end, and the voltage signal of secondary winding output meets CPU.
Liquid crystal (U4) is be used to the element that shows various information, meets CPU.
CPU (U6), be used for to gather and carry out various calculating, storage, communicate by letter with extension set, the element of issue an order, it accepts each phase small-signal current and voltage that the voltage transformer summation current transformer is inputted; Accept the signal that the three-phase communication module is sent; Send instruction and send signal to the terminal extension set by communication module.
The three-phase communication module can be by the module of communicating by letter with each electric load smart allocation terminal (extension set).
Variable connector U1, variable connector U2 and variable connector U3 two 4 select 1 variable connector, multichannel and to close U5 be the RS-485 interface chip.
The front end conversion of low voltage electric load smart allocation main frame and commutation circuit are by voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3, Current Transmit 1, Current Transmit 2, Current Transmit 3, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, variable connector U1, variable connector U2 form; Distribution transformer low-pressure end voltage U A, UB, UC connect respectively the primary side of voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3 by resistance R 1, resistance R 2, resistance R 3, the secondary side joint variable connector U2 of voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3; The secondary side of Current Transmit 1, Current Transmit 2, Current Transmit 3 respectively parallel resistance R4, resistance R 5, resistance R 6 is connected to variable connector U2; 9,10 pin of variable connector U1 and variable connector U2 meet CPU(U6 by output pin PXX1, output pin PXX2).
Not through DCTA, DCTB, DCTC, produce the electric current of 0-5A from the three-phase total current flow point of distribution transforming output at secondary.This electric current carries out quadratic transformation through Current Transmit 1, Current Transmit 2, the Current Transmit 3 that CZ1, CZ2, CZ3 enter main frame, becomes the voltage (see figure 2) that certain suitable CPU (U6) gathers in resistance R 4, resistance R 5, resistance R 6.
Enter main frame through CZ4, CZ5, CZ6, CZ7 through resistance R 1, resistance R 2, resistance R 3 current limlitings are laggard from the three-phase voltage of distribution transforming output, the voltage transformer pt 1 of main frame, voltage transformer pt 2, voltage transformer pt 3 are transformed into the voltage that certain suitable CPU (U6) gathers.
At CPU(U6) control under, output pin PXX1, output pin PXX2 produce the combination of 3 kinds " 0 " and " 1 ", the output signal of timesharing making current instrument transformer CT1, Current Transmit 2, Current Transmit 3 is to variable connector U1, and is incorporated into CPU(U6 from 13,3 pin of variable connector U1) I1P, I1N.Simultaneously, the output signal of timesharing turn-on voltage instrument transformer PT1, voltage transformer pt 2, voltage transformer pt 3 is to variable connector U2, and is incorporated into CPU(U6 from 13,3 pin of variable connector U2) UP, UN.
CPU(U6) connect 3 phase voltages, electric current to UP, UN by timesharing, I1P, I1N press size and degree of unbalance that total current is exported in the real-time calculating book distribution transforming of above-mentioned principle, and show at liquid crystal display screen U4.
When the degree of unbalance of three-phase current surpasses acceptability limit, CPU(U6) start immediately the program that gathers electric current in each electric load smart allocation terminal (extension set) of subordinate.The data that CPU(U6) need to send by certain communication protocol packing, juxtaposition output pin PXX3, output pin PXX4 are certain value.As sending mutually data to A, CPU(U6) be certain value by putting output pin PXX3, output pin PXX4, SIGA and SIGOUT are connected, that is: 12,13 of variable connector U3 is connected, the data of transmission are through CPU(U6) the SIGA-A phase voltage line of 12-13 pin-three-phase communication module of 19 pin-U3.All electric load smart allocation terminals (extension set) that are connected on the A phase can both receive order, but the terminal (extension set) of only having the address to conform to the current command just can return data.
The flow process of data receiver is (take A mutually as example): the 97 pin SIGA--three-phase communication module SIGIN--CPU(U6 of A phase voltage line--three-phase communication module).
Every order is all with the phase sequence sign, so that terminal (extension set) can be determined the relative phase sequence of three-phase input voltage line and be consistent with main frame.
Send mutually the process of order and above-mentioned basic identical to other.
Claims (2)
1. a low voltage electric load smart allocation main frame is characterized in that, described main frame is by front end conversion and commutation circuit, CPU and RS485 interface circuit, liquid crystal display circuit, three-phase communication module the electric circuit constitute; Front end conversion and commutation circuit comprise that three voltage transformers, three current transformers and two 4 select 1 variable connector U1 and variable connector U2; On the three-phase of a winding access distribution transformer low-pressure side of three voltage transformers, secondary winding converts the distribution output end voltage to voltage small-signal access host circuit to CPU; Three current transformers are exported total current with distribution and are converted Small Current Signal access host circuit to CPU; The three-phase communication module meets CPU, and the three-phase communication module links to each other with the extension set communication module by electrical network; CPU connects liquid crystal display circuit and variable connector U1 and variable connector U2.
2. a kind of low voltage electric load smart allocation main frame according to claim 1, it is characterized in that, described front end conversion and commutation circuit are by voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3, Current Transmit 1, Current Transmit 2, Current Transmit 3, resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, variable connector U1, variable connector U2 form; Distribution transformer low-pressure end voltage U A, voltage U B, voltage U C connect respectively the primary side of voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3 by resistance R 1, resistance R 2, resistance R 3, the secondary side joint variable connector U2 of voltage transformer pt 1, voltage transformer pt 2, voltage transformer pt 3; The secondary side of Current Transmit 1, Current Transmit 2, Current Transmit 3 respectively parallel resistance R4, resistance R 5, resistance R 6 is connected to variable connector U1; 9,10 pin of variable connector U1 and variable connector U2 meet CPU by output pin PXX1, output pin PXX2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220329537 CN202840682U (en) | 2012-07-10 | 2012-07-10 | Intelligent low-voltage power load allocation host |
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|---|---|---|---|
| CN 201220329537 CN202840682U (en) | 2012-07-10 | 2012-07-10 | Intelligent low-voltage power load allocation host |
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| CN202840682U true CN202840682U (en) | 2013-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821593A (en) * | 2015-05-08 | 2015-08-05 | 江西龙跃电子科技有限公司 | Low-voltage distribution transformer load intelligent adjustment system and distribution method |
-
2012
- 2012-07-10 CN CN 201220329537 patent/CN202840682U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104821593A (en) * | 2015-05-08 | 2015-08-05 | 江西龙跃电子科技有限公司 | Low-voltage distribution transformer load intelligent adjustment system and distribution method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGXI LONGYUE ELECTRONICS TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: LIU WANGSHU Effective date: 20130717 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 201103 MINHANG, SHANGHAI TO: 330009 NANCHANG, JIANGXI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130717 Address after: 330009 hi tech two road, Nanchang hi tech Development Zone, Jiangxi, Nanchang Patentee after: Jiangxi Longyue Electronics Technology Co., Ltd. Address before: Minhang District's six village 201103 Shanghai City No. 45 Room 301 Patentee before: Liu Wangshu |
|
| ASS | Succession or assignment of patent right |
Owner name: ZHANG ZUNYU Free format text: FORMER OWNER: JIANGXI LONGYUE ELECTRONICS TECHNOLOGY CO., LTD. Effective date: 20150625 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150625 Address after: 330012 No. 1069, Shen Qiao Road, Chang Dong Industrial Zone, Jiangxi, Nanchang Patentee after: Zhang Zunyu Address before: 330009 hi tech two road, Nanchang hi tech Development Zone, Jiangxi, Nanchang Patentee before: Jiangxi Longyue Electronics Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20150710 |
|
| EXPY | Termination of patent right or utility model |