CN208862637U - A kind of distribution terminal line loss module - Google Patents
A kind of distribution terminal line loss module Download PDFInfo
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- CN208862637U CN208862637U CN201821943083.8U CN201821943083U CN208862637U CN 208862637 U CN208862637 U CN 208862637U CN 201821943083 U CN201821943083 U CN 201821943083U CN 208862637 U CN208862637 U CN 208862637U
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Abstract
The utility model belongs to distribution network terminal technical field, more particularly to a kind of distribution terminal line loss module that the mode of connection is adaptive, including multiple independent measurement loops, MCU control module, IO driving circuit, voltage channel selection circuit, MCU data isolation high speed transmitting line, RS485 telecommunication circuit and RS232 telecommunication circuit, each measurement loop includes voltage sampling circuit, current sampling circuit, signal conditioning circuit and metering chip, the output end of voltage sampling circuit and current sampling circuit is connect after passing through signal conditioning circuit with the input terminal of metering chip, the output end of metering chip is connected by SPI communication and the input terminal of MCU control module；MCU control module carries out correspondence with foreign country by RS485 telecommunication circuit and RS232 telecommunication circuit.The route that the utility model realizes distribution line loss module is adaptive, can be widely applied to field of power distribution.
Description
Technical field
The utility model belongs to distribution network terminal technical field, and in particular to a kind of distribution terminal line loss module.
Background technique
Distribution transformer, cable, switchgear, reactive-load compensation equipment loss and each connection in high voltage distribution network route
The factors such as impedance, the electromagnetic radiation of point can produce electricl energy loss, increasingly tight with controller switching equipment, increasing for equipment of protection
Weight efficiently carries out the calculating of Line Loss of Distribution Network System, can optimize electric network composition, dispatching running way and decreasing loss analysis, improve economic effect
Benefit etc..Line Loss of Distribution Network System module major function is to provide a large amount of accurate, real time datas for analysis to power department and go through
History data effectively manage local power distribution network with assist power department.
The distribution line loss module of domestic production at present is required to carry out voltage rating calibration according to power supply mode difference, that is, goes out
The quantitative model for needing to demarcate distribution line loss module when factory is three-phase three-wire system or three-phase four-wire system, in the life of the equipment such as distribution terminal
During production, need to determine the mounting means at scene in advance, this is caused very to distribution manufacturer and site installation test
Big trouble, once the mode of connection information at scene provides inaccuracy or design scheme change, distribution terminal equipment need scene
The line loss module for replacing not collinear system, brings very big trouble to site operation and debugging, not only influences the duration, but also produce two
Task amount.
Utility model content
For the actual demand for adapting to field of electrical equipment, the utility model overcomes the shortcomings of the prior art, to be solved
Certainly the technical issues of, not only can be adapted for three-phase four-wire system for one kind but also can be adapted for the distribution terminal line loss of three-phase three-wire system
Module.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model are as follows: a kind of distribution terminal line loss module,
Including multiple independent measurement loops, MCU control module, IO driving circuit, correspondence with foreign country circuit, each measurement loop packet
Include voltage sampling circuit, current sampling circuit, voltage channel selection circuit, signal conditioning circuit and metering chip, the voltage
The output end of sample circuit is connect after voltage channel selection circuit, signal conditioning circuit with the input terminal of the metering chip；
The output end of the current sampling circuit is connect after passing through signal conditioning circuit with the input terminal of the metering chip, the metering
The output end of chip is connect by SPI communication with the input terminal of the MCU control module；The control terminal of the IO driving circuit with
The output end of the MCU control module connects, the control signal by being exported according to the MCU control module control it is each based on
The piece of amount chip selects CS, is also used to the control signal exported according to the MCU control module, controls the voltage channel selection electricity
Road selects voltage channel, and the MCU control module carries out correspondence with foreign country by correspondence with foreign country circuit.
The voltage sampling circuit includes 6 current mode voltage transformers, and the current sampling circuit includes that 3 electric currents are mutual
Sensor, the output signal of the voltage transformer are distinguished after voltage channel selection circuit with the output signal of current transformer
The metering chip, the circuit and capacitance that the RC low-pass filter circuit is 1k by resistance value are output to after RC low-pass filter circuit
It is formed for the capacitor of 0.033uF, cutoff frequency 4.8kHz.
The model ATT7022E of the metering chip, 26 pin SEL of the metering chip and the MCU control module
Output end connection, be provided with capacitor filter, the master chip of the IO driving circuit at 12 pins of the metering chip
Model MC74LCX245DT.
The voltage channel selection circuit includes analog switch chip ADG1634BRUZ, the analog switch chip
The control terminal of ADG1634BRUZ is connect by the IO driving circuit with the MCU control module.
The master chip of the MCU control module is STM32F417, and the master chip STM32F417 is using outside passive 8MHz
It sets and provides work clock for MCU after crystal oscillator frequency multiplication；Circuit is supervised as reset using S-80126CLMC-JIZ chip,
Using S-80146CLMC-JIZ as low-voltage testing circuit, plug-in IIC communication device 3, two of them EEPROM, distinguish
For storing metering relevant parameter and electric energy data, another is RTC clock chip, and the master chip STM32F417 is also outer
It has hung for storing SPI communication FALSH.
The correspondence with foreign country circuit includes MCU data isolation transmitting line, MCU data isolation reception circuit, MCU data control
Circuit, RS485 chip, RS232 chip, bus protection circuit and bus selection circuit processed.
It is whole that the utility model has the advantages that the utility model provides a kind of distribution compared with prior art
End line damages module, by the way that the independent measurement loop of multichannel is arranged, the independent assortment of multiple metering may be implemented, and to metering essence
Degree is without influence；Without voltage rating line system calibration of dispatching from the factory, distribution line full voltage range (100V or 57.7V) may be implemented,
The accuracy of total current range (0.3A-1.2A or 1.5A-6A) metering；The line loss module can be according to the actual situation to line loss mould
The metering method of block is set, and the route that distribution line loss module may be implemented is adaptive.
Detailed description of the invention
Fig. 1 be the utility model proposes a kind of distribution terminal line loss module structural schematic diagram；
Fig. 2 is the circuit connection diagram of measurement loop in the utility model embodiment；
Fig. 3 is the connection schematic diagram of voltage channel selection circuit in the utility model embodiment；
Fig. 4 is the circuit connection diagram of IO driving circuit in the utility model embodiment；
Fig. 5 is the structural schematic diagram of MCU control module in the utility model embodiment；
Fig. 6 is the structural block diagram of power module in the utility model embodiment；
Fig. 7 is the structural block diagram of correspondence with foreign country circuit in the utility model embodiment.
Specific embodiment
It is right below in conjunction with specific embodiments and the drawings to keep the technical solution of the utility model and advantage clearer
The technical solution of the utility model is clearly and completely described, it is clear that described embodiment is one of the utility model
Divide embodiment, instead of all the embodiments；Based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, is fallen within the protection scope of the utility model.
As shown in Figure 1, the utility model embodiment provides a kind of distribution terminal line loss module, including 8 independent meters
Measure circuit, MCU control module, IO driving circuit, correspondence with foreign country circuit, each measurement loop include voltage sampling circuit,
Current sampling circuit, voltage channel selection circuit, signal conditioning circuit and metering chip, the output end of the voltage sampling circuit
After voltage channel selection circuit, signal conditioning circuit, it is connect with the input terminal of the metering chip；The current sampling circuit
Output end by being connect with the input terminal of the metering chip after signal conditioning circuit, the output end of the metering chip passes through
SPI communication is connect with the input terminal of the MCU control module；The control terminal and the MCU control module of the IO driving circuit
Output end connection, the control signal for being exported according to the MCU control module selects CS to control the piece of each metering chip,
It is also used to the control signal exported according to the MCU control module, it is logical to control the voltage channel selection circuit selected voltage
Road, the MCU control module carry out correspondence with foreign country by correspondence with foreign country circuit.
Specifically, in 8 road independent measure circuits, metering chip is using Hi-Trend Technology (Shanghai) Co., Ltd.
ATT7022E multifunction high-precision three-phase electric energy the special metering IC, is internally integrated 7 channel independence 16bitADC, and sampling rate reaches
Can 28.8kHz, data exchange is carried out by SPI between chip and MCU, traffic rate can reach 10Mbps.The chip is suitable for
Phase three-wire three and three-phase and four-line application.Original three phase metering chip needs hardware to demarcate phase three-wire three and three-phase and four-line,
This chip is by the way that 26 pin SEL of chip, outside access high level is, it can be achieved that software changes mode at any time.I.e.: outside
When portion pin SEL=1, operating mode differentiation is carried out by register ModSel control bit.ModSel=0 is three-phase four-wire system；
ModSel=1 is three-phase three-wire system.At 12 pin AVCC metering analog power supplys of each metering units, pass through 1 big capacitance electricity
Solution capacitor 1 low-capacitance capacitor in parallel is filtered, and guarantees the operation is stable of analog circuit, 5 pin amplifier benchmark electricity of chip
Source REFCAP does same decoupling processing.
The specific following characteristics of the measurement loop of the utility model:
(1) as shown in Fig. 2, in each measurement loop, voltage sample passes through 6 current mode voltage transformers (PT1-PT6)
Secondary side current is converted into voltage signal, specified input 2mA, rated output 2mA, 0~1000V of the range of linearity, and the linearity≤
0.2%, sampling resistor is all made of 51 Europe precision low-temps drift resistance, and resistance is floated by High Precision Low Temperature in channel input current part
After sampling, the sampling pin of metering chip is input to finally by RC low-pass filter；Current signal passes through three Current Mutual Inductances
Device (CT1-CT3) acquires A, B, C three-phase current respectively, and input rated current 5A, the rated output 2.5mA of current transformer become
Than 2000:1, phase difference≤20 ', 0~20A of the range of linearity, the linearity 0.2%, precision -0.2%≤f≤0.2%.Channel is defeated
Enter current segment, resistance (RA1, RA2) sample conversion is floated into voltage signal using RC low-pass filter by High Precision Low Temperature
It is input to the sampling pin of metering chip afterwards；
(2) filtering processing of metering chip analog signal power supply and amplifier reference power supply:
Metering chip voltage VD7022 passes through 10 Europe resistance, is input to AVCC, REFCAP after CA13 and CA14 filter shape
Pin is filtered with CA15 and CA16 capacitor, guarantees the stabilization of reference voltage, and metering chip working power VDD and VCC is same
The design of REFCAP pin introduces after input power filtering processing.
(3) selection of the resistance and capacitor of RC low-pass filtering: the selection of RC low-pass filtering is the important of measurement loop precision
Guarantee section, this programme chooses 1k and 0.033uF capacitor forms, such as resistance RA3 in Fig. 2 and capacitor CA1, cutoff frequency 4.8kHz
Left and right.
(4) level state of chip phase line base pin selection；It is the design focal point of entire circuit herein, it is necessary to assure metering is every
The SEL pin high level of road chip inputs；SLE pin is directly connected with metering chip power supply.
That is, voltage sampling circuit includes 6 current mode electricity in each measurement loop of the utility model embodiment
Mutual inductor is pressed, current sampling circuit includes 3 current transformers, and the voltage transformer first passes through voltage channel selection circuit
It is output to the metering chip, the RC low pass after RC low-pass filter circuit respectively with the output signal of current transformer afterwards
The capacitor that the circuit that filter circuit is 1k by resistance value is 0.033uF with capacitance forms, cutoff frequency 4.8kHz.The metering core
26 pin SEL of piece are connect with the output end of the MCU control module, and capacitor filter is provided at 12 pins of the metering chip
Wave circuit.
As shown in figure 3, the voltage channel selection circuit includes analog switch chip ADG1634BRUZ, the simulation is opened
The control terminal for closing chip ADG1634BRUZ is connect by the IO driving circuit with the MCU control module.Consider scene access
Amount of acquisition channels is more, the independent metering method in 8 tunnels of ad hoc meter, but on-the-spot meeting the case where there are 2 road input voltages, for convenience of scene
Setting, ad hoc meter voltage circuit increase analog switch ADG1634BRUZ to realize the distribution of voltage in 8 road measurement loops.Simulation
The mainly internal resistance of the offer of consideration -5V regulated power supply and switch when switch designs, because this programme line loss module requires sampling precision
It is higher, it is therefore desirable to choose the extremely low device of switch internal resistance to guarantee the accuracy of metering.
Further, as shown in figure 4, the master chip model MC74LCX245DT of the IO driving circuit.MCU controls mould
Block and 8 tunnel metering chips use spi bus data communication, and communication process selects CS by the piece of each metering chip of control to determine
Communicated with which metering chip, for guarantee data communication quality, therefore using master chip be MC74LCX245DT IO drive
Circuit is driven, to realize MCU control module selection communication pin CS, in addition, there are one chips in IO driving circuit
MC74LCX245DT is used for the control signal exported according to MCU control module, controls the analog switch core in each measurement loop
Piece, select in voltage collection circuit in two-way voltage wherein all the way.
Further, as shown in figure 5, being the structural schematic diagram of MCU control module in the present embodiment, the MCU controls mould
The master chip of block is STM32F417, this chip is ARM32-bit Cortex-M4 kernel, built-in floating point arithmetic element (FPU).
Operating voltage range 1.8V to 3.6V, the flat rate 168MHz of maximum functional.The master chip STM32F417 is using outside passive 8MHz
It sets and provides work clock for MCU after crystal oscillator frequency multiplication；Circuit is supervised as reset using S-80126CLMC-JIZ chip,
It is 2.6V that chip, which protects voltage, exports low level lower than 2.2V chip OUT pin, and maintain 50mS.Using S-
80146CLMC-JIZ is as low-voltage testing circuit, when detecting 5V voltage lower than 4.6V, exports low electricity by chip OUT pin
It is flat, and 200mS is maintained, for handling power down relevant treatment.Plug-in IIC communication device 3 is two 512KB respectively
EEPROM and RTC chip.1 EEPROM measures relevant parameter for storing 8 tunnels, including calibration data etc.；Another 1 EEPROM is used
In all kinds of electric energy datas of storage, the electric energy data of backup.RTC uses the integrated clock chip of Epson, clock accuracy root
It is compensated automatically according to external temperature, is not necessarily to manual intervention, is provided simultaneously with leap year automatic conversion.The master chip STM32F417 is also outer
It has hung for storing SPI communication FALSH.
In addition, line loss module field connection mode has following two: voltage link mode has: 3PT (VN wiring) connection and
Two kinds of connections of 2PT (VV wiring)；The electric current mode of connection has: 3CT exports electric current and 2CT exports two kinds of electric current connection；As scene is
Phase three-wire three, it is A/N/C that nominal voltage, which inputs A/B/C external cabling access line loss module,.
I:3PT (3CT) mode
Under this mode, input phase voltage is 57.7V；
II:2PT (2CT)
Under this mode, inputting line voltage 100V；
In the utility model embodiment, according to the input signal of metering chip, the mode of connection of line loss module can be identified,
And according to the mode of connection, mode adjusting setting is carried out to metering chip.Adjusting setting is carried out to metering chip mode by MCU,
It is adjusted to phase three-wire three operation or three-phase and four-line operational mode.
The utility model combines live distribution terminal debugging software, determines the working condition of line loss module, can be complete
Avoid the in-site installation that distribution terminal equipment is greatly improved because of workload caused by field connection mode is different and debugging week
Phase reduces distribution terminal in-site installation failure rate.
In addition, as shown in fig. 6, external 48V voltage is filtered through lightning protection over-voltage in the power module of the utility model embodiment
Circuit input is protected, turns to turn 3.3V low pressure difference linearity LDO through the first 5V after 5V isolated power supply module is converted to 5V voltage through 48V
Power conversion is that 3.3V voltage is powered to MCU control module, and turning 3.3V low pressure difference linearity LDO power conversion through the 2nd 5V is 3.3V
Voltage is powered to metering chip, and turning 3.3V low pressure difference linearity LDO power conversion through the 3rd 5V is 3.3V voltage to other IC modules
Power supply, while turning 5V isolated power supply through 5V is that the isolated amplifier in circuit is powered；Turn 3.3V low pressure difference linearity LDO through the first 5V
Power conversion output 3.3V voltage is also used to power to RTC chip, and charges to super capacitor, and super capacitor is put after power down
Electricity is powered to MCU control module and real-time clock.
In the utility model embodiment, it is provided with high speed modular RS485 and RS232 communication interface；Traffic rate standard speed
Rate 4800bit/s, 9600bit/s, 19200bit/s, 38400bit/s are optional；Interface communication follows DL/T 634.5101-
2002 agreements.As shown in fig. 7, being the structural block diagram of correspondence with foreign country circuit, correspondence with foreign country circuit includes that MCU data isolation sends electricity
Road, MCU data isolation receive circuit, MCU data control circuit, RS485 chip, RS232 chip, bus protection circuit and bus
Selection circuit.
(1) RS485 telecommunication circuit
The RS485 communication interface of high-speed isolated optocoupler, traffic rate reach as high as 38400bps.Circuit design mainly considers
The design of the characteristic of optocoupler, R30, R31, R32, R33 and R34 is extremely important, it is ensured that guarantees communication quality at high temperature.TVS's
It is designed to protection differential mode surge voltage, voltage clamping avoids circuit excessive pressure damages in 6.8V.
(2) RS232 telecommunication circuit
RS232 carries out RS485 communication and RS232 communication selection by wire jumper UART and COM, and this programme is only supported a kind of logical
Letter mode, RS232 use the TVS of model SMBJ22CA, inhibit bus common mode interference.
The embodiments of the utility model have been described in detail above with reference to the accompanying drawings, but the utility model is not limited to
Embodiment is stated, within the knowledge of a person skilled in the art, the utility model aims can also not departed from
Under the premise of various changes can be made.
Claims (6)
1. a kind of distribution terminal line loss module, which is characterized in that driven including multiple independent measurement loops, MCU control module, IO
Dynamic circuit, correspondence with foreign country circuit, each measurement loop include voltage sampling circuit, current sampling circuit, voltage channel choosing
Circuit, signal conditioning circuit and metering chip are selected, the output end of the voltage sampling circuit is through voltage channel selection circuit, signal
After conditioning circuit, it is connect with the input terminal of the metering chip；The output end of the current sampling circuit passes through signal condition electricity
The input terminal of metering chip described in Lu Houyu connects, and the output end of the metering chip controls mould by SPI communication and the MCU
The input terminal of block connects；The control terminal of the IO driving circuit is connect with the output end of the MCU control module, for according to institute
The control signal for stating MCU control module output selects CS to control the piece of each metering chip, is also used to control mould according to the MCU
The control signal of block output, controls the voltage channel selection circuit and selects voltage channel, and the MCU control module is logical
It crosses correspondence with foreign country circuit and carries out correspondence with foreign country.
2. a kind of distribution terminal line loss module according to claim 1, which is characterized in that the voltage sampling circuit includes
6 current mode voltage transformers, the current sampling circuit include 3 current transformers, and the output of the voltage transformer is believed
Number after voltage channel selection circuit and the output signal of current transformer be output to after RC low-pass filter circuit respectively it is described
Metering chip, the capacitor that the circuit that the RC low-pass filter circuit is 1k by resistance value is 0.033uF with capacitance form, cutoff frequency
For 4.8kHz.
3. a kind of distribution terminal line loss module according to claim 2, which is characterized in that the model of the metering chip
The 26 pin SEL of ATT7022E, the metering chip are connect with the output end of the MCU control module, the metering chip
Capacitor filter, the master chip model MC74LCX245DT of the IO driving circuit are provided at 12 pins.
4. a kind of distribution terminal line loss module according to claim 3, which is characterized in that the voltage channel selection circuit
Including analog switch chip ADG1634BRUZ, the control terminal of the analog switch chip ADG1634BRUZ is driven by the IO
Circuit is connect with the MCU control module.
5. a kind of distribution terminal line loss module according to claim 4, which is characterized in that the master of the MCU control module
Chip is STM32F417, and the master chip STM32F417 is provided after using the external crystal oscillator frequency multiplication of passive 8MHz for MCU
Work clock；Using S-80126CLMC-JIZ chip as supervision circuit is resetted, using S-80146CLMC-JIZ as low pressure
Detection circuit, is respectively used to storage metering relevant parameter and electric flux by plug-in IIC communication device 3, two of them EEPROM
Data, another is RTC clock chip, and the master chip STM32F417 is also plug-in for storing SPI communication FALSH.
6. a kind of distribution terminal line loss module according to claim 1, which is characterized in that the correspondence with foreign country circuit includes
MCU data isolation transmitting line, MCU data isolation receive circuit, MCU data control circuit, RS485 chip, RS232 chip,
Bus protection circuit and bus selection circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821943083.8U CN208862637U (en) | 2018-11-23 | 2018-11-23 | A kind of distribution terminal line loss module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821943083.8U CN208862637U (en) | 2018-11-23 | 2018-11-23 | A kind of distribution terminal line loss module |
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| CN208862637U true CN208862637U (en) | 2019-05-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007297A (en) * | 2019-11-15 | 2020-04-14 | 积成电子股份有限公司 | Multi-loop voltage distribution and selection circuit and implementation method thereof |
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2018
- 2018-11-23 CN CN201821943083.8U patent/CN208862637U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007297A (en) * | 2019-11-15 | 2020-04-14 | 积成电子股份有限公司 | Multi-loop voltage distribution and selection circuit and implementation method thereof |
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