CN110275072A - The phase line detector and its detection method in low-voltage three-phase load imbalance platform area - Google Patents
The phase line detector and its detection method in low-voltage three-phase load imbalance platform area Download PDFInfo
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- CN110275072A CN110275072A CN201910665360.6A CN201910665360A CN110275072A CN 110275072 A CN110275072 A CN 110275072A CN 201910665360 A CN201910665360 A CN 201910665360A CN 110275072 A CN110275072 A CN 110275072A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/18—Indicating phase sequence; Indicating synchronism
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
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Abstract
The invention discloses a kind of phase line detectors in low-voltage three-phase load imbalance platform area, including host and slave；Host is mounted on user side, acquires the monophase current signal of the installed phase line of user side in real time and sends slave；Slave is mounted on platform area step down side, and the three-phase current signal in real-time picking platform area simultaneously judges the phase line that host is installed.The invention also discloses the detection methods of the phase line detector in the low-voltage three-phase load imbalance platform area.Current phase value that the present invention is detected respectively by host and slave is simultaneously compared, can accurate determining table area transformer low-pressure side test side-affiliated phase line of host-, and the method for the present invention can accurately calculate the degree of unbalancedness and line loss value of three-phase current.Therefore, high reliablity of the invention, accuracy are good and low in cost.
Description
Technical field
Present invention relates particularly to the phase line detectors and its detection method in a kind of low-voltage three-phase load imbalance platform area.
Background technique
With the development and the improvement of people's living standards of economic technology, electric energy has become in people's production and life
Essential secondary energy sources bring endless convenience to people's production and life.Thus it is guaranteed that electric energy is safe and reliable
Supply, just becomes one of most important target of electric system.
Meanwhile the safe and reliable operation in order to guarantee power grid, it is desirable that accurately grasp the information such as separate of each user.Together
When, line loss and tri-phase unbalance factor are also the important performance assessment criteria of power grid security reliability service, it is also desirable to grasp data in real time.
Currently, accurately obtaining relatively difficult in the implementation process of the separate information of each user at the scene, main cause has:
The archives material in platform area is inaccurate, and after some track remodellings, the archive information in marketing system is not corrected in time；Power circuit
Drawing archive is of the remote past to cause the affiliated feeder line of user to obscure；The path of the existing data for retaining client's metering device, service conductor
It is very common etc. incomplete phenomenon.Meanwhile in actual operation, degree of unbalancedness and the real-time computing function of line loss, are all electricity consumptions
Power carrier signal valve and pulse current method identify phase.But these methods can intersect because of underground cable, overload
Etc. reasons the case where causing signal decaying, interference, cause detection inaccurate.
Summary of the invention
One of the objects of the present invention is to provide a kind of high reliablity, accuracy is good and low-cost low-voltage three-phase load
The phase line detector in uneven platform area.
The second object of the present invention is to provide a kind of phase line detector in low-voltage three-phase load imbalance platform area
Detection method.
The phase line detector in this low-voltage three-phase load imbalance platform area provided by the invention, including host and slave；
Host is mounted on user side, for acquiring the monophase current signal of the installed phase line of user side in real time, and is sent to slave；Slave
It is mounted on platform area step down side, for the three-phase current signal in real-time picking platform area, and according to the platform area three-phase electricity of acquisition
The monophase current signal that signal and received host upload is flowed, judges the phase line that host is installed.
The host includes host power supply module, host current acquisition module, host controller module and main-machine communication
Module；Host current acquisition module and host computer communication module are connect with host controller module；Host power supply module is for giving
Host supplying power；Host current acquisition module is used to acquire the monophase current signal of the installed phase line of host and uploads host controller
Module；Host computer communication module with slave and external equipment for being communicated；Host controller module is for controlling host work.
The host further includes host temperature-measuring module；Host temperature-measuring module and host controller module connect
It connects, for measuring ambient temperature information locating for host and uploading host controller module.
The host temperature-measuring module is the module being made of the temperature sensor of model LM75A.
The host further includes host memory module；Host memory module is connect with host controller module, for depositing
Store up the operational data of host.
The host memory module is SD card memory module.
The host controller module is the module being made of the controller chip of model STM32x103VCT7.
Host power supply module includes cell host, host 5V analog power circuit, host 3.3V digital power circuit and master
Machine 5V digital power circuit；The output end of cell host is direct and connects host 5V analog power circuit and host 5V digital power electricity
Road；The output end of host 5V analog power circuit concatenates host 3.3V digital power power supply；Cell host is host power supply module
Power supply electric energy is provided；Host 5V analog power circuit provides the+5V power supply of analog circuit for host；Host 5V digital power circuit
+ 5 power supplys of digital circuit are provided for host；Host 3.3V digital power circuit is used to provide+the 3.3V of digital circuit to host
Power supply.
The host computer communication module includes host RS232 telecommunication circuit and hosi wireless communication circuit；Host RS232 is logical
Letter circuit and hosi wireless communication circuit are connect with host controller module.
The hosi wireless communication circuit is the circuit being made of the communications module of model AS13B-TTL.
The slave includes slave power module, slave current sampling module, slave controller module and slave communication
Module；Slave current sampling module and slave communication module are connect with slave controller module；Slave power module is to slave
Power supply；Slave current sampling module is used to detect the three-phase current signal of slave installation site and uploads slave controller module；
Slave communication module with host and external equipment for being communicated；Slave controller module is for controlling slave work.
The slave further includes slave memory module；Slave memory module is connect with slave controller module, for depositing
Store up the operational data of slave.
The slave memory module is SD card memory module.
The slave controller module is the module being made of the controller chip of model STM32x103VCT7.
The slave power module includes slave 220V filter circuit, slave rectification circuit and slave 3.3V digital power
Circuit；Slave 220V filter circuit, slave rectification circuit and slave 3.3V digital power circuit are sequentially connected in series；Slave 220V filtering
Circuit is for filtering out power grid clutter；Slave rectification circuit is used to the 220V AC energy that outside provides being converted to low-voltage DC
Energy；Slave 3.3V digital power circuit is used to be converted to low-voltage direct electric energy the 3.3V power supply of digital circuit.
The slave communication module includes slave RS232 telecommunication circuit and slave radio communication circuit；Slave RS232 is logical
Letter circuit and slave radio communication circuit are connect with slave controller module.
The slave radio communication circuit is the circuit being made of the communications module of model AS13B-TTL.
The present invention also provides a kind of detection method of the phase line detector in low-voltage three-phase load imbalance platform area,
Include the following steps:
S1. host and slave carry out time synchronization；
S2. the three-phase current signal of slave acquisition institute's installation site；The current signal of the installed phase line of host acquisition, and on
Pass slave；
S3. slave by each phase current phase of the current phase of the installed phase line of host and three-phase current from machine testing into
Row compares, so that it is determined that the phase line that host is installed；
S4. slave calculates the degree of unbalancedness of three-phase current；
S5. slave calculates line loss value according to the degree of unbalancedness of the step S4 three-phase current being calculated.
The slave is by each phase current phase of the current phase of the installed phase line of host and the three-phase current from machine testing
Position is compared, so that it is determined that the phase line that host is installed, if the current phase of specially the installed phase line of host, with slave institute
The phase difference of the X phase current of detection then assert that the phase line that host is installed is X phase less than 5 °；X phase is A phase, B phase or C
Phase.
The slave calculates the degree of unbalancedness of three-phase current, and the injustice of three-phase current is specially calculated using following formula
Weighing apparatus degree:
β in formulaAFor A phase current degree of unbalancedness, IAFor A phase current, IavFor the average value of the root-mean-square value of three-phase current, βB
For B phase current degree of unbalancedness, IBFor B phase current, βCFor C phase current degree of unbalancedness, ICFor C phase current.
The slave calculates line loss value, specially adopts according to the degree of unbalancedness of the step S4 three-phase current being calculated
Line loss value is calculated with following formula:
P in formulaunbFor line loss value, βAFor A phase current degree of unbalancedness, βBFor B phase current degree of unbalancedness, βCNot for C phase current
The degree of balance, IavFor the average value of the root-mean-square value of three-phase current, RelFor substitutional resistance value.
The phase line detector and its detection method in this low-voltage three-phase load imbalance platform area provided by the invention, pass through
Current phase value that host and slave detect respectively is simultaneously compared, can accurate determining table area transformer low-pressure side test side
Phase line belonging to (host), and the method for the present invention can accurately calculate the degree of unbalancedness and line loss value of three-phase current.Therefore, originally
High reliablity, the accuracy of invention are good and low in cost.
Detailed description of the invention
Fig. 1 is the functional block diagram of the device of the invention.
Fig. 2 is the circuit theory schematic diagram of host current acquisition module of the invention.
Fig. 3 is the circuit theory schematic diagram of host power supply module of the invention.
Fig. 4 is the circuit theory schematic diagram of host memory module of the invention.
Fig. 5 is the circuit theory schematic diagram of host computer communication module of the invention.
Fig. 6 is the circuit theory schematic diagram of host temperature-measuring module of the invention.
Fig. 7 is the circuit theory schematic diagram of host controller module of the invention.
Fig. 8 is the circuit theory schematic diagram of slave power module of the invention.
Fig. 9 is the circuit theory schematic diagram of slave memory module of the invention.
Figure 10 is the circuit theory schematic diagram of slave communication module of the invention.
Figure 11 is the circuit theory schematic diagram of slave controller module of the invention.
Figure 12 is the method flow schematic diagram of detection method of the invention.
Specific embodiment
As shown in Figure 1 be the functional block diagram of the device of the invention: this low-voltage three-phase load provided by the invention is uneven
The phase line detector in the area Heng Tai, including host and slave；Host is mounted on user side, is installed for acquiring user side in real time
The monophase current signal of phase line, and it is sent to slave；Slave is mounted on platform area step down side, for real-time picking platform area
Three-phase current signal, and the monophase current signal uploaded according to the platform area three-phase current signal of acquisition and received host, judgement
The phase line that host is installed.
In the specific implementation, slave can be directly installed on the step down side in platform area；Hand-held can be made in host
Equipment so that host can move at any time, and can flexibly confirm that certain phase line is specially A phase, B phase or C at the scene
Phase.
Host includes host power supply module, host current acquisition module, host controller module, host computer communication module, master
Machine temperature-measuring module and host memory module；Host current acquisition module, host temperature-measuring module, host memory module and
Host computer communication module is connect with host controller module；Host power supply module is used for host supplying power；Host current acquisition mould
Block is used to acquire the current signal of the installed phase line of host and uploads host controller module；Host computer communication module is used for and slave
It is communicated with external equipment；Host controller module is for controlling host work；Host temperature-measuring module and host control
Device module connection, for measuring ambient temperature information locating for host and uploading host controller module；Host memory module with
Host controller module connection, for storing the operational data of host.
Slave include slave power module, slave current sampling module, slave controller module, slave memory module and from
Machine communication module；Slave current sampling module, slave memory module and slave communication module are connect with slave controller module；
Slave power module is powered to slave；Slave current sampling module be used for detect slave installation site three-phase current signal and
Pass slave controller module；Slave communication module with host and external equipment for being communicated；Slave controller module is used for
Control slave work；Slave memory module is connect with slave controller module, for storing the operational data of slave.
Be illustrated in figure 2 the circuit theory schematic diagram of host current acquisition module of the invention: slave is due to needing to sample
The current signal of triple line, so slave includes three tunnels current collection circuit as shown in Figure 2；Host only needs to sample to be mounted
The current signal of phase line, so host only needs to include current collection circuit as shown in Figure 2 all the way.
In figure, ITU is current transformer, and current transformer is connected in phase line detected, for converting high current
After voltage signal, exported by 3 feet and 4 feet；After the signal of output is protected by TVS pipe T2, then pass through divider resistance
It after RJ6 and RJ7 carries out precisely partial pressure and voltage sample, is protected again by TVS pipe T4, then passes through resistance R50, R51
Voltage is filtered and is lifted with capacitor C38, and the voltage follower being then made up of amplifier U7A carries out voltage isolation and follows, so
The signal exported afterwards is carrying out current limliting by resistance R48, then after being filtered by RC filter circuit R47 and C39, then by by
The second-order low-pass filter filtering that amplifier U7B is constituted, the signal then exported are divided into two-way: being put all the way by amplifier U5A
Greatly, to obtain sampled signal AD-U all the way；Then, the DA-U signal which exports with controller again is by comparing
Device U6A obtains signal TRIG-U signal, for judging the zero-acrross ing moment of reference phase, obtains the phase information of reference signal；The
Two road signals are amplified by amplifier U5B, and wherein the both ends R53 parallel connection AD5271 digital variable resistance, plays change times magnification
Several effects.The second tunnel sampled signal AD-I is obtained through amplification；Then it is defeated with controller to pass through comparator again for the road sampled signal
DA-I signal out compares, to obtain signal TRIG-I signal and be input to controller module, may also used to judge base
The zero-acrross ing moment of quasi- phase, obtains the phase information of reference signal, and the times magnification of amplifier section can be changed in No. second sample circuit
Number, for acquiring bigger current signal.
Be illustrated in figure 3 the circuit theory schematic diagram of host power supply module of the invention: host power supply module includes host
Battery, host 5V analog power circuit, host 3.3V digital power circuit and host 5V digital power circuit；Cell host it is defeated
Outlet is direct and connects host 5V analog power circuit and host 5V digital power circuit；The output end of host 5V analog power circuit
Concatenate host 3.3V digital power power supply；Cell host provides power supply electric energy for host power supply module；Host 5V analog power electricity
Road provides the+5V power supply of analog circuit for host；Host 5V digital power circuit provides+5 power supplys of digital circuit for host；It is main
Machine 3.3V digital power circuit is used to provide+3.3V the power supply of digital circuit to host.
Wherein, the both ends of cell host connect TP1 and TP2, to input battery power；The electric energy of input passes through insurance
After JK1 is protected, then by diode D11 progress unidirectional protection, then filtered by capacitor VSR1, Cin3 and Cin2
Wave after being then filtered again by inductance L5, is protected by TVS pipe TVS1；Signal after protection, passes through sampling resistor
After R10 and R14 is sampled, it is input to controller module, to guarantee that controller module can monitor the electric energy of battery in real time
State；Meanwhile the signal after protection, started by starting switch S1, is then input to host 5V analog power circuit
Input terminal.
Host 5V analog power circuit mainly includes power supply chip U11 (model LM2940-5.0V) and corresponding one
Serial filter capacitor (C1D, C2D, C3D and C4D)；After the signal of input is filtered by capacitor C1D and C2D, it is input to power supply core
1 foot of piece U11,2 feet and 4 feet of chip are directly grounded, and 3 feet of chip directly export 5V power supply, and conduct as output pin
The 5V power supply signal of analog circuit is filtered simultaneously also by capacitor C3D and C4D.
Meanwhile the output terminals A 5V of host 5V analog power circuit, it is connected to host 3.3V digital power circuit；Host
3.3V digital power circuit include power supply chip U10 (model LM1117MPX-3.31) and a series of filter capacitors (C52,
C50, C51 and C53)；After 5V power supply signal is filtered by capacitor C52 and C50, it is input to 3 feet of power supply chip U10, the 1 of chip
Foot is directly grounded, and 2 feet of chip are then used as output pin to export 3.3V power supply, and as digital 3.3V power supply signal；Meanwhile it should
Power supply signal is grounded also by capacitor C51 and C53 and filters.
Equally, signal+Vin2 all the way is separated after starting switch S1；The road signal passes through a way switch (not shown)
It is connected to the input terminal (+Vin3) of host 5V digital power circuit；By the control to switch, controller module can control 5V
The supply of digital power；Host 5V digital power circuit includes power supply chip U12 (model LM2940-5.0V) and corresponding
A series of filter capacitors (C1A, C2A, C3A and C4A)；After power supply signal+Vin3 is filtered by capacitor C1A and C2A, it is input to electricity
1 foot of source chip, 2 feet and 4 feet of chip are directly grounded, and 3 feet of chip then export digital power signal+5V；Simultaneously also by
Capacitor C3A and C4A ground connection filtering.
Be illustrated in figure 4 the circuit theory schematic diagram of host memory module of the invention: host memory module is deposited for SD card
Store up module；The wherein SDIO-D2 signal of the 9 feet connection controller module output of SD card；1 foot of SD card is directly connected to controller mould
The SDIO-D3 signal of block output；2 feet of SD card are directly connected to the SDIO-CMD signal and acquisition instruction of controller module output；
3 feet, 6 feet of SD card are directly grounded；4 feet of SD card are directly connected to power supply signal 3.3V；5 feet of SD card are directly connected to controller mould
The SDIO-CK signal of block output simultaneously obtains clock signal；7 feet of SD card are directly connected to the SDIO-DO letter of controller module output
Number；8 feet of SD card are directly connected to the SDIO-D1 signal of controller module output.Meanwhile 1 foot, 2 feet, 7 feet, 8 feet and 9 of SD card
Foot passes through respective pull-up resistor connection 3.3V power supply signal, to guarantee the level equalization of 5 pins.
Be illustrated in figure 5 the circuit theory schematic diagram of host computer communication module of the invention: host computer communication module includes host
RS232 telecommunication circuit and hosi wireless communication circuit；Host RS232 telecommunication circuit and hosi wireless communication circuit with host control
Device module connection processed.
Figure middle and upper part is wireless communication module；The model TTL-433 (AS13B-TTL) of wireless communication module, the 1 of module
Foot connects controller module；Second communications pins UART2_ of 2 feet and 3 feet of module as communications pins connection controller module
TX and UART2_RX；4 feet of module connect controller module；5 feet of module connect power supply signal 3.3V；6 feet of module are direct
Ground connection；Meanwhile module 2 feet and 3 feet be connected to switch chip K5；Switch chip K5 is for selecting communication module for wireless communication
Or RS232 communication.
Lower part in figure is the interface of RS232 communication；The RS232 port of controller module and external equipment is directly connected to
It can communicate；J1 in figure is standard interface, is used for versatility communication interface.1 foot of interface directly connects+5V power supply signal, 6 feet
It is directly grounded；2 feet and 3 feet are then used as pin to connect UART2_TX-2 and UART2_RX-2；8 feet, 4 feet and 9 feet of interface then connect
It connects controller module and obtains control signal.
When needing RS232 to communicate, control chip K5 is connected, UART2_TX-2 and UART2_RX-2 pin passes through K5 at this time
UART2_TX the and UART2_RX pin of self-operated controller module；Otherwise, K5 is disconnected, and controller module is defaulted wirelessly
It is communicated.
It show the circuit theory schematic diagram of host temperature-measuring module of the invention: host temperature measurement as shown in Figure 6
Module is the module being made of the temperature sensor of model LM75A.1 foot and 2 feet of sensor as signal output pin, with
The mode output temperature measuring signal of bus, and it is connected to the communications pins of controller module；Two communications pins simultaneously
3.3V power supply is connected by respective pull-up resistor, to guarantee the stability of pin level；3 feet of sensor are idle；4 feet are straight
Ground connection；After 5 feet, 6 feet and 7 feet are shorted, pass through capacitor C11 connection power supply signal 3.3V；8 feet are then used as power pins to connect
3.3V power supply signal.
Be illustrated in figure 7 the circuit theory schematic diagram of host controller module of the invention: host controller module is served as reasons
The module that the controller chip of model STM32x103VCT7 is constituted.It include two crystal oscillating circuits in figure；Wherein C2, C3, Y1 and
R1 constitutes the first crystal oscillating circuit, exports the first crystal oscillation signal OSC_IN and OSC_OUT and is input to 12 feet of controller chip
With 13 feet；C4, C5 and Y2 constitute the second crystal oscillating circuit, export the second crystal oscillation signal OSC32_IN and OSC32_OUT and input
To 8 feet and 9 feet of controller chip；K1 is reset switch, and one end is by pull-up resistor R3 connection power supply signal 3.3V, by pressing
Lower reset switch K1, can output reset signal NRST, and be input to 14 foot of reset pin of controller chip.25 feet of chip
It is communications pins and connection signal UART2_TX and UART2_RX with 26 feet, and connects 2 feet and 3 feet of remote communication module WX1；
29 feet of chip and 30 foot outputting reference comparison signal DA-U and DA-I, and it is connected to current sampling module；The 31 of chip simultaneously
Foot and the reference phase of 32 feet connection current sampling module comparator output differentiate signal TRIG-U and TRIG-I；The 72 of chip
Foot, 76 feet, 77 feet, 89 feet and 90 feet are connected to JTAG debugging interface, to carry out the program debugging of controller chip；Chip
20 feet connect power supply signal VREF-, and 21 feet connect power supply signal VREF+, while post filtering capacitor is connected between 20 feet and 21 feet
C8 and C10, while inductance L3 is serially connected between VREF+ and power supply signal VDDA；The 6 feet connection battery BT1 of chip is simultaneously obtained
3.3V power supply signal；50 feet, 75 feet, 100 feet, 28 feet and 11 feet of chip are all connected with 3.3V power supply signal, at the same each pin it
Between also by capacitor (C13, C14, C12, C15, C16 and C17) be grounded filter；49 feet, 74 feet, 99 feet, 27 feet and 10 of chip
Foot is directly grounded；55 feet of chip and 56 feet connection temperature sensor simultaneously obtain ambient temperature information；83 feet of chip, 80 feet,
79 feet, 78 feet, 66 feet and 65 feet then connect memory module and carry out data interaction, thus storage or reading data；The 15 of chip
Foot, 16 feet, 17 feet and 18 feet then connect current sampling module and obtain sampled signal.
Be illustrated in figure 8 the circuit theory schematic diagram of slave power module of the invention: slave power module includes slave
220V filter circuit, slave rectification circuit and slave 3.3V digital power circuit；Slave 220V filter circuit, slave rectification circuit
It is sequentially connected in series with slave 3.3V digital power circuit；Slave 220V filter circuit is for filtering out power grid clutter；Slave rectification circuit
220V AC energy for providing outside is converted to low-voltage direct electric energy；Slave 3.3V digital power circuit is used for low pressure
Direct current energy is converted to the 3.3V power supply of digital circuit.
The 220V AC energy that the power supply of slave module is an externally input；The firewire L of 220V alternating current by insurance F1 and
Switch S1 is connected to 2 feet of filter AC_GL, and the zero curve N of 220V alternating current is directly connected to 3 feet of filter AC_GL；Filter
The model FC-LX1D of AC_GL, for filtering out the noise signal in AC energy；1 foot of filter is directly grounded, filter
4 foot of output end and 5 feet output signal, be connected to 2 feet and 3 feet of rectification module AC-DC, 1 foot of rectification module is direct
Ground connection, the model LH10-10D0524 of rectification module；4 foot of output end of rectification module and 5 foot output+5V electric energy (wherein+
Vin1 is positive pole, and-Vin1 is power cathode), while the output end of rectification module also exports (the figure acceptance of the bid of 24V direct current signal
Show A24V and 24VGND)；Power supply signal+Vin1 also passes through capacitor Cin3 and filters, and after being protected by TVS pipe TVS1,
Export final simulation 5V power supply signal A5V；And A5V signal connects slave 3.3V digital power circuit；Slave 3.3V number electricity
Source circuit includes filter capacitor C50, C52, C51 and C53 and power supply chip U10；5V power supply signal passes through capacitor C50 and C52
3 feet of power supply chip U10 (LM1117MPX-3.3 is indicated in figure) are input to after filtering, 2 feet of power supply chip then export 3.3V electricity
Source signal, while passing through capacitor C51 and C53 ground connection filtering.
Be illustrated in figure 9 the circuit theory schematic diagram of slave memory module of the invention: slave memory module is also SD card
Memory module, circuit diagram are almost the same with host SD memory module.Wherein the 9 feet connection controller module of SD card exports
SDIO-D2 signal；1 foot of SD card is directly connected to the SDIO-D3 signal of controller module output；2 feet of SD card are directly connected to control
The SDIO-CMD signal and acquisition instruction of device module output processed；3 feet, 6 feet of SD card are directly grounded；4 feet of SD card are directly connected to
Power supply signal 3.3V；5 feet of SD card are directly connected to the SDIO-CK signal of controller module output and obtain clock signal；SD card
7 feet be directly connected to controller module output SDIO-DO signal；8 feet of SD card are directly connected to controller module output
SDIO-D1 signal.Meanwhile 1 foot, 2 feet, 7 feet, 8 feet and 9 feet of SD card pass through respective pull-up resistor connection 3.3V power supply letter
Number, to guarantee the level equalization of 5 pins.
As shown in Figure 10 be the circuit theory schematic diagram of slave communication module of the invention: due to host and slave need into
Communication mode and agreement when going and communicate, and communicating etc. must correspond, therefore slave communication module also includes slave
RS232 telecommunication circuit and slave radio communication circuit；Slave RS232 telecommunication circuit and slave radio communication circuit with slave control
Device module connection processed；And the circuit diagram of slave communication module and the circuit diagram of host computer communication module are also identical.
Figure middle and upper part is wireless communication module；The model TTL-433 (AS13B-TTL) of wireless communication module, the 1 of module
Foot connects controller module；Second communications pins UART2_ of 2 feet and 3 feet of module as communications pins connection controller module
TX and UART2_RX；4 feet of module connect controller module；5 feet of module connect power supply signal 3.3V；6 feet of module are direct
Ground connection；Meanwhile module 2 feet and 3 feet be connected to switch chip K5；Switch chip K5 is for selecting communication module for wireless communication
Or RS232 communication.
Lower part in figure is the interface of RS232 communication；The RS232 port of controller module and external equipment is directly connected to
It can communicate；J1 in figure is standard interface, is used for versatility communication interface.1 foot of interface directly connects+5V power supply signal, 6 feet
It is directly grounded；2 feet and 3 feet are then used as pin to connect UART2_TX-2 and UART2_RX-2；8 feet, 4 feet and 9 feet of interface then connect
It connects controller module and obtains control signal.
When needing RS232 to communicate, control chip K5 is connected, UART2_TX-2 and UART2_RX-2 pin passes through K5 at this time
UART2_TX the and UART2_RX pin of self-operated controller module；Otherwise, K5 is disconnected, and controller module is defaulted wirelessly
It is communicated.
As shown in figure 11 be the circuit theory schematic diagram of slave controller module of the invention: slave controller module is served as reasons
The module that the controller chip of model STM32x103VCT7 is constituted.It include two crystal oscillating circuits in figure；Wherein C2, C3, Y1 and
R1 constitutes the first crystal oscillating circuit, exports the first crystal oscillation signal OSC_IN and OSC_OUT and is input to 12 feet of controller chip
With 13 feet；C4, C5 and Y2 constitute the second crystal oscillating circuit, export the second crystal oscillation signal OSC32_IN and OSC32_OUT and input
To 8 feet and 9 feet of controller chip；K1 is reset switch, and one end is by pull-up resistor R3 connection power supply signal 3.3V, by pressing
Lower reset switch K1, can output reset signal NRST, and be input to 14 foot of reset pin of controller chip.25 feet of chip
It is communications pins and connection signal UART2_TX and UART2_RX with 26 feet, and connects 2 feet and 3 feet of remote communication module WX1；
72 feet, 76 feet, 77 feet, 89 feet and 90 feet of chip are connected to JTAG debugging interface, to carry out the program tune of controller chip
Examination；20 feet of chip connect power supply signal VREF-, and 21 feet connect power supply signal VREF+, while between 20 feet and 21 feet after connection
Filter capacitor C8 and C10, while inductance L3 is serially connected between VREF+ and power supply signal VDDA；6 feet of chip connect battery BT1
And obtain 3.3V power supply signal；50 feet, 75 feet, 100 feet, 28 feet and 11 feet of chip are all connected with 3.3V power supply signal, while each
It is grounded and filters also by capacitor (C13, C14, C12, C15, C16 and C17) between pin；49 feet, 74 feet, 99 feet, 27 of chip
Foot and 10 feet are directly grounded；83 feet, 80 feet, 79 feet, 78 feet, 66 feet and 65 feet of chip then connect memory module and carry out data
Interaction, thus storage or reading data；15 feet, 16 feet and 17 feet of chip then connect current sampling module and obtain collected
Sampled signal AD-IA, AD-IB and AD-IC of three-phase current.
It is as shown in figure 12 the method flow schematic diagram of detection method of the invention: this low voltage three-phase provided by the invention
The detection method of the phase line detector in load unbalanced area, includes the following steps:
S1. host and slave carry out time synchronization；
S2. slave acquires the three-phase current signal in installed platform area；Host acquires the current signal of installed phase line, and
Upload slave；
S3. slave by each phase current phase of the current phase of the installed phase line of host and three-phase current from machine testing into
Row compares, so that it is determined that the phase line that host is installed；If the current phase of specially the installed phase line of host, is detected with slave
X phase current phase difference less than 5 °, then assert that the phase line that slave is installed is X phase；X phase is A phase, B phase or C phase；
S4. slave calculates the degree of unbalancedness of three-phase current；Body is the degree of unbalancedness that three-phase current is calculated using following formula:
β in formulaAFor A phase current degree of unbalancedness, IAFor A phase current, IavFor the average value of the root-mean-square value of three-phase current, βB
For B phase current degree of unbalancedness, IBFor B phase current, βCFor C phase current degree of unbalancedness, ICFor C phase current；
S5. slave calculates line loss value according to the degree of unbalancedness of the step S4 three-phase current being calculated；Specially using such as
Lower formula calculates line loss value:
P in formulaunbFor line loss value, βAFor A phase current degree of unbalancedness, βBFor B phase current degree of unbalancedness, βCNot for C phase current
The degree of balance, IavFor the average value of the root-mean-square value of three-phase current, RelFor substitutional resistance value.
The purpose for calculating line loss is to be able to grasp the uneven situation of power grid three-phase, be connected so as to adjust user
Phase line.
Claims (10)
1. a kind of phase line detector in low-voltage three-phase load imbalance platform area, it is characterised in that including host and slave；Host
It is mounted on user side, for acquiring the monophase current signal of the installed phase line of user side in real time, and is sent to slave；Slave installation
In platform area step down side, believe for the three-phase current signal in real-time picking platform area, and according to the platform area three-phase current of acquisition
Number and received host upload monophase current signal, judge the phase line that host is installed.
2. the phase line detector in low-voltage three-phase load imbalance platform area according to claim 1, it is characterised in that described
Host include host power supply module, host current acquisition module, host controller module and host computer communication module；Host electric current
Acquisition module and host computer communication module are connect with host controller module；Host power supply module is used for host supplying power；Host
Current acquisition module is used to acquire the current signal of the installed phase line of host and uploads host controller module；Host computer communication module
For being communicated with slave and external equipment；Host controller module is for controlling host work.
3. the phase line detector in low-voltage three-phase load imbalance platform area according to claim 1, it is characterised in that host
Power module includes cell host, host 5V analog power circuit, host 3.3V digital power circuit and host 5V digital power
Circuit；The output end of cell host is direct and connects host 5V analog power circuit and host 5V digital power circuit；Host 5V mould
The output end of quasi- power circuit concatenates host 3.3V digital power power supply；Cell host provides power supply electricity for host power supply module
Energy；Host 5V analog power circuit provides the+5V power supply of analog circuit for host；Host 5V digital power circuit provides for host
+ 5 power supplys of digital circuit；Host 3.3V digital power circuit is used to provide+3.3V the power supply of digital circuit to host.
4. the phase line detector in low-voltage three-phase load imbalance platform area, feature described according to claim 1~one of 3 exist
In the host further include host temperature-measuring module；Host temperature-measuring module is connect with host controller module, is used for
Ambient temperature information locating for measurement host simultaneously uploads host controller module；The host temperature-measuring module is by model
The module constituted for the temperature sensor of LM75A；The host further includes host memory module；Host memory module and host
Controller module connection, for storing the operational data of host；The host memory module is SD card memory module；Described
Host controller module is the module being made of the controller chip of model STM32x103VCT7；The main-machine communication mould
Block includes host RS232 telecommunication circuit and hosi wireless communication circuit；Host RS232 telecommunication circuit and hosi wireless communication circuit
It is connect with host controller module；The hosi wireless communication circuit is the communications module structure by model AS13B-TTL
At circuit.
5. the phase line detector in low-voltage three-phase load imbalance platform area, feature described according to claim 1~one of 3 exist
In the slave include slave power module, slave current sampling module, slave controller module and slave communication module；From
Machine current sampling module and slave communication module are connect with slave controller module；Slave power module is powered to slave；From
Machine current sampling module is used to detect the three-phase current signal of slave installation site and uploads slave controller module；Slave communication
Module with host and external equipment for being communicated；Slave controller module is for controlling slave work.
6. the phase line detector in low-voltage three-phase load imbalance platform area according to claim 5, it is characterised in that described
Slave power module include slave 220V filter circuit, slave rectification circuit and slave 3.3V digital power circuit；Slave
220V filter circuit, slave rectification circuit and slave 3.3V digital power circuit are sequentially connected in series；Slave 220V filter circuit is used for
Filter out power grid clutter；Slave rectification circuit is used to the 220V AC energy that outside provides being converted to low-voltage direct electric energy；Slave
3.3V digital power circuit is used to be converted to low-voltage direct electric energy the 3.3V power supply of digital circuit.
7. the phase line detector in low-voltage three-phase load imbalance platform area according to claim 5, it is characterised in that described
Slave further include slave memory module；Slave memory module is connect with slave controller module, for storing the work of slave
Data；The slave memory module is SD card memory module；The slave controller module is by model
The module that the controller chip of STM32x103VCT7 is constituted；The slave communication module include slave RS232 telecommunication circuit and
Slave radio communication circuit；Slave RS232 telecommunication circuit and slave radio communication circuit are connect with slave controller module；Institute
The slave radio communication circuit stated is the circuit being made of the communications module of model AS13B-TTL.
8. the detection side of the phase line detector in low-voltage three-phase load imbalance platform area described in a kind of one of claim 1~7
Method includes the following steps:
S1. host and slave carry out time synchronization；
S2. slave acquires the three-phase current signal in installed platform area；Host acquires the current signal of installed phase line, and uploads
Slave；
S3. slave compares the current phase of the installed phase line of host and each phase current phase of the three-phase current from machine testing
Compared with so that it is determined that the phase line that host is installed；
S4. slave calculates the degree of unbalancedness of three-phase current；
S5. slave calculates line loss value according to the degree of unbalancedness of the step S4 three-phase current being calculated.
9. detection method according to claim 8, it is characterised in that the slave is by the electric current of the installed phase line of host
Phase is compared with each phase current phase of the three-phase current from machine testing, so that it is determined that the phase line that host is installed, specifically
If the phase difference with slave X phase current detected then assert slave institute less than 5 ° for the current phase of the installed phase line of host
The phase line of installation is X phase；X phase is A phase, B phase or C phase.
10. detection method according to claim 8, it is characterised in that the slave calculates the imbalance of three-phase current
Degree specially calculates the degree of unbalancedness of three-phase current using following formula:
β in formulaAFor A phase current degree of unbalancedness, IAFor A phase current, IavFor the average value of the root-mean-square value of three-phase current, βBFor B phase
Current unbalance factor, IBFor B phase current, βCFor C phase current degree of unbalancedness, ICFor C phase current；
The slave calculates line loss value according to the degree of unbalancedness of the step S4 three-phase current being calculated, specially using such as
Lower formula calculates line loss value:
P in formulaunbFor line loss value, βAFor A phase current degree of unbalancedness, βBFor B phase current degree of unbalancedness, βCIt is uneven for C phase current
Degree, IavFor the average value of the root-mean-square value of three-phase current, RelFor substitutional resistance value.
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