CN201266853Y - Distribution change terminal - Google Patents
Distribution change terminal Download PDFInfo
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- CN201266853Y CN201266853Y CNU2008201630003U CN200820163000U CN201266853Y CN 201266853 Y CN201266853 Y CN 201266853Y CN U2008201630003 U CNU2008201630003 U CN U2008201630003U CN 200820163000 U CN200820163000 U CN 200820163000U CN 201266853 Y CN201266853 Y CN 201266853Y
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The utility model discloses a distribution terminal, which comprises a three-phase measurement chip and a function processing chip with liquid crystal driving. The three-phase measurement chip is connected with the input end of the function processing chip. The function processing chip is also respectively connected with a pulse output circuit, an LED display circuit, a memory, an infrared communication circuit, an RS485 circuit, a clock chip with temperature compensation, and a GPRS communication circuit. The three-phase measurement chip uses an AD 73360 L chip, and the function processing chip uses an STR7120FZ2T6 chip. In the distribution terminal, the high precision measurement chip AD73360 L chip is adopted, which causes that the sample resolution of the voltage current is greatly increased, the measuring accuracy of the distribution terminal is increased and the distribution terminal can stably reliably run for a long time.
Description
[technical field]
The utility model relates to and being installed near the distribution transformer, to the supervision of every operational factor of distribution transformer, the distant place distribution transformer terminals of measurement.
[background technology]
Power office generally is with a multifunction electric meter electricity consumption situation to be measured to big power consumption client's management now, and then the ruuning situation of multifunctional meter is monitored with a distribution transformer terminals, by cordless communication network Monitoring Data is dealt into the related system of power office, office side just judges according to these real time datas whether the electricity consumption situation ammeter work whether normal, that be used to measure at electricity consumption scene is normal.Performance requirement to distribution transformer terminals is very high so in fact, because what it played in this system in fact is the effect of a standard scale and human observer, and relevant Monitoring Data will be transferred to wireless communication networks by it, so the requirement of reliability to it is quite high, particularly the requirement aspect computation chip, GPRS communication is all higher, and present distribution transformer terminals measuring accuracy is relatively poor, long-play is reliable and stable inadequately, effect reactive power compensation is bad.
[summary of the invention]
The purpose of this utility model solves the problems of the prior art exactly, proposes a kind of distribution transformer terminals, can improve measuring accuracy, and can long-time reliable and stable operation.
For achieving the above object, the utility model proposes a kind of distribution transformer terminals, the function treatment chip that comprises three phase metering chip, band liquid crystal drive, the three phase metering chip is connected the input of function treatment chip, also be connected with clock chip, the GPRS communicating circuit of impulse output circuit, LCD display circuit, memory, infrared communication circuit, RS485 circuit, band temperature-compensating on the function treatment chip respectively, described three phase metering chip adopts the AD73360L chip, and the function treatment chip adopts the STR710FZ2T6 chip.
As preferably, described memory adopts the 24LC256I chip.
As preferably, the input of described function treatment chip also is connected with button inputting circuits and negative phase sequence testing circuit.
As preferably, three line control circuits that described infrared communication circuit adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.
As preferably, described RS485 circuit adopts the MAX13485 chip.
As preferably, the clock chip of described band temperature-compensating adopts the DS3231 chip.
The beneficial effects of the utility model: the utility model voltage, electric current are after sample circuit is taken a sample respectively, sending into the three phase metering chip handles, and be converted into digital signal and deliver to the function treatment chip and calculate, to the storage access data, on the LCD of LCD display circuit liquid crystal, show every data, carry out the communication transmission as required by infrared communication circuit or RS485 circuit.Adopt modular design method both can gather every electrical parameter of distribution transformer voluntarily, also can gather the data of the on-the-spot ammeter of user by RS485 bus (or pulse), perhaps by RS485 bus and other distribution transformer terminals or other concentrator devices cascade, transmit data, the electric power thus supplied of monitoring and management distribution transformer.Adopt high-precision measuring chip AD73360L, make the electric current and voltage sampling resolution greatly improve, improved the measuring accuracy of distribution transformer terminals, and can long-time reliable and stable operation.
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is the structural representation of the utility model distribution transformer terminals.
[embodiment]
Consult Fig. 1, distribution transformer terminals, the function treatment chip 2 that comprises three phase metering chip 1, band liquid crystal drive, three phase metering chip 1 is connected the input of function treatment chip 2, also be connected with clock chip 8, the GPRS communicating circuit 15 of impulse output circuit 3, LCD display circuit 4, memory 5, infrared communication circuit 6, RS485 circuit 7, band temperature-compensating on the function treatment chip 2 respectively, described three phase metering chip 1 adopts the AD73360L chip, and function treatment chip 2 adopts the STR710FZ2T6 chip.The input of described function treatment chip 2 also is connected with button inputting circuits 9 and negative phase sequence testing circuit 10.Voltage, electric current are sent into three phase metering chip 1 and are handled after sample circuit is taken a sample respectively, and are converted into digital signal and deliver to function treatment chip 2 and calculate.Owing to adopted special-purpose AD73360L chip, make the electric current and voltage sampling resolution greatly improve, improved the measuring accuracy of distribution transformer terminals, and can long-time reliable and stable operation.Function treatment chip 2 is used for time-shared charge and handles various inputoutput datas, by serial line interface the data of special-purpose electric energy chip are read, and finish metering of timesharing active energy and maximum demand metering function according to the real-time time of clock chip 8 and the predefined period of band temperature-compensating, as required to memory 5 access datas, on the LCD of LCD display circuit 4 liquid crystal, show every data, carry out the communication transmission by infrared communication circuit 6 or RS485 circuit 7, and finish the monitoring of operational factor, record store various kinds of data.Utilize the GPRS communicating circuit to finish the monitoring of the on-the-spot various parameters of electricity consumption simultaneously, the record store various kinds of data.
Entire circuit adopts linear power supply 11 and battery circuit 13 by electric power management circuit 12 power supplies.Adopt linear transformer step-down mode, the hermetically sealed mode of transformer adopting, clean and tidy reliable, simultaneously because the rear end power consumption is very big, so the power output of transformer also is bigger.Because the power consumption during the GPRS emission is very big, can reach on the 1A, common voltage-stabiliser tube can not be exported such electric current at all, can export the LM2576 5.0V of 3A electric current as voltage-stabilizing device so select maximum, the 5V power supply is supplied with outside the metering section, supply with related devices such as single-chip microcomputer and ARM by 3.3VLDO, by supplying with the GPRS communication module about LM29302 output 4.2V, the reason that adopts LM29302 is a module to the quality requirement of power supply than higher, what especially ripple will be absolute is little, in addition because be to 4.2V with the 5V power conversion, and suitable big of the power consumption of 4.2V power supply, can reach about 1.6A, and under such output current situation, require falling of voltage to be less than 400mA, the magnitude of voltage after falling must be greater than the module of 3.3V minimum operating voltage, so select power output big, ripple is little, and the LM29302 of low pressure reduction exports as voltage stabilizing.Because terminal only need not kept its operate as normal 3 minutes when having external power source, allow it last related data can be dealt into telecommunication network, after this only need to guarantee that the normal operation of clock is just passable, our design guarantees not have power supplies in 3 minutes behind the external power source with nickel-hydrogen chargeable cell, guarantees the power supply of clock chip DS3231 with single-unit 3.6V battery.When having external power source and Ni-MH battery electric weight not enough, BQ2507 charges to Ni-MH battery by the battery charge control chip, and charging process can be divided into precharge, quick charge, supply charging and 4 stages of trickle charge.Adopt little pre-charge electricity when just beginning to charge, the terminal voltage of battery rises very fast, changes quick charge when rising to 1.2V over to, and quick charge is to use large current charge, generally adopts more than the 1C, and most of electric energy of battery recovered in this stage.In order to guarantee that battery fills people 100% electric energy, also supply charging process with regard to adding, promptly after reaching 4.2V, cell voltage enters the trickle floating charge stage, battery is safeguarded, to prevent self-discharge of battery, charge rate is generally (1/30) C, and the charging current of storage battery represents with charge rate C that usually C is the rated capacity of storage battery.For example, to the 1Ah battery charge, charge rate is exactly 2C with the 2A electric current; Similarly, to the 500mAh battery charge, charge rate is exactly 4C with the 2A electric current.We receive the front end of LM2576 5.0V with the output of rechargeable battery, and the output of rechargeable battery power supply does not provide the power supply of entire equipment when having external power source.
Described memory 5 adopts the 24LC256I chip.24LC256I is the Low-Power CMOS serial EEPROM of U.S. Microchip company, it is to include 32K x 8 (256K bit) memory space, have operating voltage wide (2.5～5.5V), the fast characteristics such as (less than 5ms) of erasable (greater than 10000 times) often, writing speed.1,2,3 pin of 24LC256I are three address wires, be used for determining the hardware address of chip, the 8th pin and the 4th pin are respectively positive and negative power supply, the 5th pin SDA is the serial data I/O, data are by this two-way I2C bus serial transfer, the 6th pin SCL is the serial clock incoming line, SDA and SCL all need and positive supply between respectively connect on the resistance of a 10K and draw, the 7th pin needs ground connection.Have address register in the sheet among the 24LC256I.Whenever after writing or read a data byte, this address register adds 1 automatically, to realize the read-write to next memory cell.All bytes all read in the single operation mode.For reducing total write time, once-through operation can write the nearly data of 8 bytes.
Three line control circuits that described infrared communication circuit 6 adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.Infrared communication circuit 6 is divided into and transmits and receives two parts.The radiated element of radiating portion is an infrarede emitting diode, and what it sent is infrared ray rather than visible light, and the Infrared wavelength that infrarede emitting diode commonly used sends is about 940nm, the about 100mW of transmitting power.The infrared receiving tube of receiving circuit is a kind of photodiode, will add reverse biased to infrared receiving diode during use, and its could operate as normal and obtain high sensitivity.Because the transmitting power of infrarede emitting diode is less, the signal that infrared receiving diode is received a little less than, so receiving terminal will increase the high-gain amplifying circuit.No matter yet now be amateurish the making or formal product, mostly adopt the integrated reception head of finished product.The integrated head that receives of infrared ray is the module that collects infrared reception, amplification, filtering and comparator output etc., stable performance, reliable.The infrared part circuit adopts three line control circuits, i.e. output (emission) is imported (reception) and is used single line with two lines, exports one of them mouthful and utilizes timer to export the 38K ripple always, another mouthful output sends signal waveform, can be regarded as the transmission of control 38K ripple; Receive owing to adopting integrated reception head, what arrive function treatment chip 2 pins is common level, so connect with a middle fracture, begins to receive infrared data when receiving to enter after level changes to break.
Described RS485 circuit 7 adopts the MAX13485 chip.RS485 circuit 7 is a kind of serial ports commonly used, has advantages such as network is easy to connect, good in anti-interference performance, long transmission distance.Use the networking of RS-485 bus, only need a pair of twisted-pair feeder just can realize that the multisystem networking constitutes distributed system, equipment is simple, cheap, communication distance is long.In application system, RS-485 half-duplex asynchronous communication bus is by the widely used data communication bus of each research and development institution, and it often is applied between centralized control hinge and the decentralized control unit.In order to realize the isolation of bus and function treatment chip system, between the asynchronous communication mouth of function treatment chip and MAX13485, adopt light-coupled isolation.Because in the application system, main frame and extension set are separated by far away, the total length of communication line is often above 400 meters, and subordinate machine system powers on or reset and usually do not finish in the same moment.If the DE terminal potential of MAX13485 is " 1 " at this moment, the output of its 485 buses will be in transmit status so, has just taken communication bus, and other extension set just can't communicate with main frame like this.This situation shows that especially (deadlock) under the abnormal conditions appears in certain extension set, can make whole system communication collapse.Therefore when circuit design, the DE terminal potential of MAX13485 is " 0 " in the time of should guaranteeing system power-on reset.Because the function treatment chip is at reseting period, I/O mouth output high level is so the connection of circuit solves the problem that the reseting period extension set " is stung " bus effectively.The design of output circuit will fully take into account the various interference on the circuit and the coupling of line characteristic impedance.Because the engineering-environment more complicated, often there are various forms of interference sources at the scene, so the transmission ends of 485 buses must be added with safeguard measure.In circuit design, can select for use can antisurge TVS transient state clutter suppresor spare, consider the special circumstances (as the breakdown short circuit of 485 chips of a certain table) of circuit, for preventing that the communication of other extension set is affected in the bus, at two thermistors of 485 signal output parts series connection of MAX13485.The hardware fault of this sample machine just can not make the communication of whole bus be affected.
The distribution transformer terminals table is because of involving time-shared charge, must use external hardware clock clock chip, should not adopt software clock, software clock causes inaccurate clock when being interfered, by the software algorithm error correction, can cause certain error, example adopts technology of error correction in a minute, makes mistakes when needing error correction in interference, can cause one minute error.Adopt external clock to adopt Philip PCF8563 in early days, the outside 32.768KHZ crystal that adopts, the external clock crystal is strict on welding procedure, can only adopt the backguy technology, otherwise can cause the crystal failure of oscillation, and clock stops walking.The DS3231 chip is 3PPM for band auto thermal compensation chip at-40 ℃ ~+80 ℃ clock clocking errors, and a day error is 0.26 second every day, is 2PPM in nominal temperature, and a day error is 0.18 second every day.Produce in batches and can guarantee your office's requirement is day error at 0.2 second, can satisfy.The RX8025 that EPSON company produces, clock be ± 5PMM, and this day error is 0.4 second every day, and its precision can be adjusted, but step pitch is 3PPM, promptly is-0.5 second originally promptly 0.26 second every day, can be-0.24 second after adjustment.But its output pulse is inhomogeneous, must will amplify test period.Adopt the RX8025 outside also temperature sensor must be arranged, adopt the software mode mode to carry out temperature-compensating, calculated once in general 10 minutes, compensation falls flat; Can't carry out temperature-compensating under the power-off condition, clocking error is difficult to control, in running clock is rewritten, and has a big risk, and causes the clock disorder easily.DS3231 is little power consumption, also can carry out the clock temperature self-compensation under the power-off condition.
The power of electrical network output comprises two parts, the one, and active power, the 2nd, reactive power.Directly consumed power changes electric energy into mechanical energy, heat energy, chemical energy or acoustic energy, utilizes these energy works done, and this part power is called active power.Consumed power not, just electric energy is converted to the energy of another kind of form, this can as electric equipment can work done essential condition, and, this can be to carry out the periodicity conversion with electric energy in electrical network, this part power is called reactive power, sets up the electric energy that magnetic field takies as electromagnetic component, and capacitor is set up the shared electric energy of electric field.During work done, electric current is ahead of 90 ℃ of voltages to electric current in inductance element.And electric current is in capacity cell during work done, 90 ℃ of electric current lagging voltages.In same circuit, inductive current is opposite with the capacitance current direction, 180 ℃ of mutual deviations.If capacity cell is installed in the electromagnetic component circuit proportionally, both electric currents are cancelled out each other, the vector of electric current and the angle between the voltage vector are dwindled, thereby improve the ability of electric energy work done, the reason of reactive power compensation that Here it is.The mode of reactive power compensation is a lot, and the utility model adopts reactive power self-compensating controlling device whether to reach input and the excision that idle set point is controlled power capacitor according to power system reactive power, and the under voltage protection function was arranged.
The foregoing description is to explanation of the present utility model, is not to qualification of the present utility model, any structure after the utility model simple transformation is all belonged to protection range of the present utility model.
Claims (6)
1. distribution transformer terminals, it is characterized in that: comprise three phase metering chip (1), the function treatment chip (2) of band liquid crystal drive, three phase metering chip (1) is connected the input of function treatment chip (2), also be connected with impulse output circuit (3) on the function treatment chip (2) respectively, LCD display circuit (4), memory (5), infrared communication circuit (6), RS485 circuit (7), the clock chip (8) of band temperature-compensating, GPRS communicating circuit (15), described three phase metering chip (1) adopts the AD73360L chip, and function treatment chip (2) adopts the STR710FZ2T6 chip.
2. distribution transformer terminals as claimed in claim 1 is characterized in that: described memory (5) adopts the 24LC256I chip.
3. distribution transformer terminals as claimed in claim 1 is characterized in that: the input of described function treatment chip (2) also is connected with button inputting circuits (9) and negative phase sequence testing circuit (10).
4. distribution transformer terminals as claimed in claim 1 is characterized in that: three line control circuits that described infrared communication circuit (6) adopts an incoming line, the output line of an output 38K waveform, an output to send signal waveform.
5. distribution transformer terminals as claimed in claim 1 is characterized in that: described RS485 circuit (7) adopts the MAX13485 chip.
6. as any one described distribution transformer terminals in the claim 1 to 5, it is characterized in that: the clock chip of described band temperature-compensating (8) adopts the DS3231 chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201630003U CN201266853Y (en) | 2008-08-25 | 2008-08-25 | Distribution change terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201630003U CN201266853Y (en) | 2008-08-25 | 2008-08-25 | Distribution change terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201266853Y true CN201266853Y (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201630003U Expired - Fee Related CN201266853Y (en) | 2008-08-25 | 2008-08-25 | Distribution change terminal |
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| Country | Link |
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| CN (1) | CN201266853Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033717A (en) * | 2012-12-28 | 2013-04-10 | 安徽中兴继远信息技术股份有限公司 | Oversampling distribution transformer terminal |
-
2008
- 2008-08-25 CN CNU2008201630003U patent/CN201266853Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033717A (en) * | 2012-12-28 | 2013-04-10 | 安徽中兴继远信息技术股份有限公司 | Oversampling distribution transformer terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090701 Termination date: 20170825 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |