CN111766436A - Intelligent wireless current clamp and electricity larceny prevention checking method thereof - Google Patents
Intelligent wireless current clamp and electricity larceny prevention checking method thereof Download PDFInfo
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Abstract
An intelligent wireless current clamp and an electricity larceny prevention checking method thereof comprise an acquisition module, a temperature detection module, a wifi module, an LORA module, a processor chip, a FLASH storage module, an 'operation' indicator lamp, a 'fault' indicator lamp and an RS232 maintenance serial port; the power utilization condition of the topological network can be acquired and analyzed step by step, the power utilization condition of the topological line can be intuitively reflected, the problem that the complex low-voltage distribution line cannot effectively detect the power utilization condition and cannot check the electricity stealing problem of the branch line with abnormal power utilization is solved, and the working efficiency of field detection personnel is improved; the devices arranged at different positions can communicate with each other, realize local data summarization and analysis, and draw a conclusion whether a power stealing event occurs.
Description
Technical Field
The patent relates to a current monitoring current clamp, in particular to an intelligent wireless current clamp and an anti-electricity-theft inspection method thereof.
Background
In the current electricity stealing prevention process of electricity utilization inspection, electricity stealing prevention technologies and means are mostly electricity stealing prevention management and control aiming at a metering side, so that the current power supply line at the low-voltage side of a public transformer area is connected in a private lap joint mode, electricity stealing phenomena of electricity utilization around a meter are increased day by day, the means and the manner are called poor, however, the power supply line at the area is complex in power supply mode, power supply radius and branch power supply, the electricity stealing prevention technologies and the means of the line at the low-voltage side of the power supply area are limited, time and labor are wasted in the mode of finding electricity stealing through manual inspection, and the.
Disclosure of Invention
In order to solve the problems: the traditional current clamp meter inspection tool is improved, the Rogowski coil replaces a traditional fixed current clamp, the Rogowski coil is hung on two sides of a power supply line of a high-line loss transformer area and serves as an Internet of things sensing and monitoring device, monitored current data are sent to an intelligent peripheral terminal of electricity utilization inspectors in a wireless communication mode, and input and output comparison data of the current of the power supply line of the high-line loss transformer area can be monitored in real time. The host current clamp can complete the comparison of the internet of things data with a plurality of sub-machine current clamps which are connected in a hierarchical mode in a mode that one host current clamp is matched with a plurality of sub-machine current clamps.
The technical scheme adopted by the invention is as follows: an intelligent wireless current clamp comprises an acquisition module, a temperature detection module, a wifi module, an LORA module, a processor chip, a FLASH storage module, an 'operation' indicator light, a 'fault' indicator light and an RS232 maintenance serial port; the acquisition module and the temperature detection module are connected with an AD interface on the processor chip, and the 'operation' indicator light and the 'fault' indicator light are connected with an Output interface on the processor chip; the FLASH storage module is connected with an SPI (serial peripheral interface) on the processor chip, and the RS232 maintenance serial port is connected with a Uart D interface on the processor chip; the wifi module and the LORA module are respectively connected with a Uart B interface and a Uart C interface on the processor chip through RS232 communication interfaces (B, C, D is the serial number of the Uart interface);
acquiring an external current analog signal through an acquisition module, calculating an acquisition value, storing the acquisition value in a FLASH storage module, performing data transmission with a wifi module and an LORA module through an RS communication interface, reading historical data of the FLASH storage module according to the data requirement of the wifi module, and performing data transmission reading through the LORA module and current clamps arranged at other positions if the current historical data of the current clamps arranged at other positions is required;
the method comprises the steps that analog signal quantity output by a Ross coil is collected through a processor chip, so that the real-time current value of a low-voltage distribution line is detected, periodic average current data is obtained, the collected average current data is transmitted through an LORA module or data of current clamps arranged at other positions are summoned, the power utilization condition of a power transmission line is obtained through internal data analysis and calculation, and then the power utilization condition is transmitted to an intelligent peripheral terminal through a wifi module;
the acquisition module carries out the current real-time value of transmission line to through the current real-time value calculation average value to the accumulational, and carry out data statistics with other equipment, can analyze out the power consumption condition of present circuit, tentatively obtain the consume of circuit, can reflect the power consumption condition of low pressure distribution lines very fast.
Further, the processor chip is a chip with model number STM32F407, the WIFI module adopts an industrial wireless control WiFi module with model number ESP8266-12F,
furthermore, the LORA module adopts a wireless LoRa6100PRO module, the transmitting power reaches 1W, the relay routing function is supported, and the data can be transmitted through the serial port communication; and allocating one GPIO to carry out reset control on the GPIO.
Furthermore, the acquisition module outputs 2V alternating current analog quantity, only a positive level can be acquired by considering an acquisition AD interface in the CPU, so that the zero level needs to be raised for an analog alternating current signal, the circuit increases the output impedance by dividing 3.3V into 1.65V and passing through a primary voltage follower, the secondary connection capacitor prevents instantaneous dynamic load, and meanwhile, the high-frequency interference of a reference source can be inhibited.
Further, the current clamp adopts battery powered, the device adopts the low-power consumption mode, inside STM32 adopts the dormancy mode operation, continue to keep the dormancy after gathering low pressure distribution lines real-time value after triggering STM32 awakens up when the timer interrupt, thereby reduce device CPU's operation consumption, thereby the last operating duration of extension device, adopt insulating ABS material processing through the device shell, inner circuit and low pressure distribution lines are insulating completely, guarantee inside complete circuit safe and reliable operation, device internal design does not generate heat simultaneously and devices and designs such as easily fire.
The invention has the advantages and characteristics that:
(1) the device has realized under the complicated topological network condition based on low pressure distribution lines, can be step by step gather the analysis to topological network's power consumption condition, and the unable effectual detection power consumption condition of this topological circuit of audio-visual reaction has been solved complicated low pressure distribution lines, can't investigate simultaneously the branch line's that the power consumption is unusual stealing the electricity problem, has improved witnessed inspections personnel work efficiency.
(2) The devices arranged at different positions can communicate with each other, realize local data summarization and analysis, and draw a conclusion whether a power stealing event occurs.
Drawings
FIG. 1 is a schematic overall structure of a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the present invention for avoiding fraudulent use;
FIG. 3 is a block diagram of a host power-on service flow in accordance with a preferred embodiment of the present invention;
FIG. 4 is a block diagram of a slave power-on service flow of the preferred embodiment of the present invention;
FIG. 5 is a power supply circuit diagram of the logic circuit of the processor chip according to the preferred embodiment of the invention;
FIG. 6 is an interface diagram of a processor chip according to a preferred embodiment of the present invention;
FIG. 7 is a reset circuit diagram of a processor chip in accordance with a preferred embodiment of the present invention;
FIG. 8 is a circuit diagram of the SPI external 128MFLASH circuit of the preferred embodiment of the present invention;
FIG. 9 is a diagram of an analog reference circuit in accordance with a preferred embodiment of the present invention;
FIG. 10 is a circuit diagram of the current collection circuit according to the preferred embodiment of the present invention;
fig. 11 is a circuit diagram of a WIFI module in accordance with a preferred embodiment of the present invention;
FIG. 12 is a circuit diagram of a debugging serial port according to a preferred embodiment of the present invention;
the reference numerals in the drawings denote: the intelligent wireless power supply system comprises a 1-acquisition module, a 2-temperature detection module, a 3-wifi module, a 4-LORA module, a 5-processor chip, a 6-FLASH storage module, a 7- "operation" indicator lamp, an 8- "fault" indicator lamp, a 9-RS232 maintenance serial port, a 10-three-phase four-wire electric meter, an 11-slave intelligent wireless current clamp (called slave for short), a 12-master intelligent wireless current clamp (called master for short) and a 13-intelligent peripheral terminal.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1 and 2, an intelligent wireless current clamp includes an acquisition module 1, a temperature detection module 2, a wifi module 3, an LORA module 4, a processor chip 5, a FLASH memory module 6, an "operation" indicator light 7, a "failure" indicator light 8, and an RS232 maintenance serial port 9; the acquisition module 1 and the temperature detection module 2 are connected with an AD interface on the processor chip 5, and the 'operation' indicator light 7 and the 'failure' indicator light 8 are connected with an Output interface on the processor chip 5; the FLASH storage module 6 is connected with an SPI interface on the processor chip 5, and the RS232 maintenance serial port 9 is connected with a Uart D interface on the processor chip 5; the wifi module 3 and the LORA module 4 are respectively connected with the Uart B interface and the Uart C interface on the processor chip 5 through RS232 communication interfaces (B, C, D is the serial number of the Uart interface);
acquiring an external current analog signal through an acquisition module 1, calculating an acquisition value, storing the acquisition value in a FLASH storage module 6, performing data transmission with a wifi module 3 and an LORA module 4 through an RS232 communication interface, reading historical data of the FLASH storage module 6 according to the data requirement of the wifi module 3, and performing data transmission reading (namely a master mode and a slave mode) through the LORA module 4 and current clamps at other positions if the current data of the current clamps arranged at other positions is required;
the real-time current value of the low-voltage distribution line is detected by acquiring the analog signal quantity output by the Ross coil through the processor chip 5, periodic average current data is obtained, the acquired average current data is transmitted through the LORA module 4 or the data of current clamps arranged at other positions is summoned, the power consumption condition of the obtained power transmission line is transmitted to an intelligent peripheral terminal through the wifi module 3 through internal data analysis and calculation;
the acquisition module 1 is used for carrying out the current real-time value of the power transmission line, calculating the average value of the accumulated real-time value and carrying out data statistics with other equipment, so that the power utilization condition of the current line can be analyzed, the loss of the line is preliminarily obtained, and the power utilization condition of the low-voltage power distribution line can be reflected quickly.
The method for collecting the external current analog signal, calculating the collected value and storing the collected value in the FLASH storage module 6 comprises the following steps:
when the intelligent wireless current clamp host generates an accumulated online for 15 minutes, collecting real-time current data through an AT7022E chip;
the host computer stores 96 data points of one day in a circular queue according to time sequence; calculating a queue head pointer and a queue tail pointer according to the read RTC value during interrupt initialization; then, when frozen data are generated, the frozen data are inserted into a queue by a queue tail pointer; one element space is less used in the appointed queue, the tail +1 of the queue is the head of the queue when the queue is full, and the queue is in an initialization state when the queue is empty; the queue tail pointer points to the next position of the queue tail element, is always empty, is inserted into the queue tail element when a new event occurs, and deletes the queue head element when the circulating queue is full, and an element space is empty and is inserted from the queue tail; after the storage is finished, the timer task takes out 12 freezing current data points from the circular queue at the timing of 3 hours and stores the freezing current data points in the FLASH storage module 6.
The processor chip 5 is a chip of type STM32F407 (STM32F407 enhanced series uses high performance
CortexTMAn M332 bit RISC core, operating at 72MHz, built-in high-speed memory (up to 512 kbytes of flash memory and 64 kbytes of SRAM), rich enhanced I/O ports and peripherals coupled to both APB buses. The device comprises 3 12-bit ADCs, 4 universal 16-bit timers and 2 PWM timers, and also comprises standard and advanced communication interfaces: up to 2I 2C interfaces, 3 SPI interfaces, 2I 2S interfaces, 1 SDIO interface, 5 USART interfaces, one USB interface, and one CAN interface. STM32 large capacity enhancement mode series work in the temperature range of-40 ℃ to +105 ℃, and supply voltage is 2.0V to 3.6V, and a series of power saving modes guarantee the requirement of low-power consumption application).
The WIFI module 3 is an industrial wireless control WiFi module, the model is ESP8266-12F, SMD packaging is adopted, the packaging size is 24 x 16 x 3mm, rapid production can be achieved through SMT equipment, serial port communication is adopted, and data can be transmitted. And allocating one GPIO to carry out reset control on the GPIO.
The LORA module 4 adopts a wireless LoRa6100PRO module, the transmitting power reaches 1W, the relay routing function is supported, the serial port communication is adopted, and the data can be transmitted. And allocating one GPIO to carry out reset control on the GPIO.
The acquisition module 1 outputs 2V alternating current analog quantity, and only a positive level can be acquired by considering an AD interface acquired inside a CPU (Central processing Unit), so that a zero level needs to be raised for an analog alternating current signal, the circuit divides 3.3V into 1.65V and passes through a primary voltage follower, the output impedance is increased, a rear-stage connecting capacitor prevents instantaneous dynamic load, and meanwhile, high-frequency interference of a reference source can be suppressed.
The current clamp is powered by a battery, 4-section No. 5 dry batteries are used for power supply, the device adopts a low power consumption mode, the internal STM32 runs in a sleep mode, when the timer interrupt triggers STM32 to wake up and then collect the real-time value of the low-voltage distribution line, the low-voltage distribution line continues to stay dormant, thereby reducing the operation power consumption of the CPU of the device and prolonging the continuous operation time of the device, the shell of the device is processed by adopting an insulating ABS material, the internal circuit is completely insulated from the low-voltage distribution line, the safe and reliable operation of the internal complete circuit is ensured, meanwhile, the internal design of the device is free of heating, inflammable devices and other devices and designs, the device can be installed at low voltage distribution lines for a long time to carry out data detection, has the characteristics of unattended long-time operation, and inspectors can irregularly detect data to the site, so that the working efficiency of the site personnel is improved, and meanwhile, more data are collected, and the electricity utilization condition of the lines can be more accurately analyzed.
The electricity larceny prevention inspection method of the intelligent wireless current clamp is characterized by comprising the following steps:
the method comprises the following steps: the method comprises the following steps that a plurality of intelligent wireless current clamps are hung at different positions on two sides of a power supply line of a high-line-loss distribution area in a 1+ N mode (namely, a mode that one host machine is matched with a plurality of sub machines) to serve as an Internet of things sensing monitoring device, and the host machine can complete Internet of things data comparison with a plurality of slave machines hung according to levels;
step two: converting the current of the low-voltage distribution line into an analog voltage semaphore by adopting an acquisition module 1; acquiring analog voltage through a processor chip 5 so as to obtain the primary line current power consumption condition;
step three: collecting and transmitting current and average current of the current installation and other branch low-voltage distribution lines through communication of the LORA module 4;
step four: the power utilization condition under the existing topological structure is analyzed by calculating and analyzing through the processor chip 5;
step five: uploading the data analyzed by the processor chip 5 through the WIFI module;
step six: the monitored current data is sent to an external terminal of a power utilization inspector in a wireless communication mode, so that input and output comparison data of the power supply line current in the high-line loss transformer area can be monitored, and whether a power stealing event occurs or not is analyzed.
The intelligent peripheral terminal is connected to WIFI of the terminal, and parameter setting is carried out on the terminal through a parameter setting interface of the intelligent peripheral terminal. After the parameter setting is finished, the host and the slave operate respective modes respectively. The master machine calls the slave machines regularly through LoRa, and the data collected by the slave machines. The slave computer collects the slave computer data in real time and stores the data, and reports the data after receiving the host computer calling command. The host reports the received data to the intelligent peripheral terminal, and the intelligent peripheral terminal has a topological graph with parameter setting, analyzes the data and displays the result.
Description of the main circuit:
FIG. 5 is a power supply circuit diagram of the logic circuit of the processor chip according to the preferred embodiment of the invention; the LDO of the AS1117 is selected to be converted into 3.3V to supply power for a CPU and a logic circuit, AD isolation is carried out by selecting a CBW321609U102B magnetic bead, and AS the CPU main frequency is larger than 100MHz, a resonance point is selected to be near 100M, and high-frequency interference signals of the coupling analog circuit are filtered.
Fig. 6 and 7 are circuit diagrams of the interface and reset circuit of the processor chip according to the preferred embodiment of the invention (see table 1 for the interface of the processor chip), in which the reset signal is pulled up by default, and when the button is pressed manually, the low level triggers the CPU to reset.
TABLE 1
Fig. 8 is a diagram of an SPI external 128MFLASH circuit according to a preferred embodiment of the present invention, which is an SPI external 128MFLASH circuit, and uses a second path of SPI interface of the CPU for communication. By adopting the W25Q128FVSIG DATA FLASH chip, the SPI communication interface and the/WP pin are effective in low level, the status register can be protected from being rewritten. An IO pin connected to the MCU.
Fig. 9 is an analog reference circuit diagram of the preferred embodiment of the present invention, considering that the CPU internal acquisition AD interface can only acquire positive level, so it needs to raise the analog ac signal to zero level, the circuit increases the output impedance by dividing the voltage of 3.3V into 1.65V and passing through a first stage voltage follower, the latter stage is connected with C94 to prevent transient dynamic load, and C95 is used to suppress the high frequency interference of the reference source.
FIG. 10 is a circuit diagram of the current collection circuit according to the preferred embodiment of the present invention;
fig. 11 is a circuit diagram of a WIFI module according to a preferred embodiment of the present invention, which is a commercially mature WIFI module for industrial wireless control, model number ESP8266-12F, and is packaged by SMD, with a package size of 24 × 16 × 3mm, and can be rapidly produced by SMT equipment. And by adopting serial port communication, data can be transmitted transparently. And allocating one GPIO to carry out reset control on the GPIO.
FIG. 12 is a circuit diagram of a debugging serial port according to a preferred embodiment of the present invention; UARTI is used as a maintenance serial port of terminal equipment, and UARTI is selected because UART1 is one of serial peripherals supported by an STM32F407 embedded bootstrap program, so that program upgrading and other operations can be conveniently performed through the serial port in the future. The RS232 interface chip selects MAX3232CSE, and carries out bidirectional protection on an external interface and a TVs tube. The TVS tube selects ESDA14V2L, the VRM of the TVS tube is 12V, the minimum value of VBR is 14.2V, and a USBA interface is adopted for matching with an interface of a working module and maintaining a serial port.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the structural relationship and principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. An intelligent wireless current clamp is characterized by comprising an acquisition module (1), a temperature detection module (2), a wifi module (3), an LORA module (4), a processor chip (5), a FLASH storage module (6), an 'operation' indicator lamp (7), a 'fault' indicator lamp (8) and an RS232 maintenance serial port (9); the acquisition module (1) and the temperature detection module (2) are connected with an AD interface on the processor chip (5), and the operation indicator lamp (7) and the fault indicator lamp (8) are connected with an Output interface on the processor chip (5); the FLASH storage module (6) is connected with an SPI (serial peripheral interface) on the processor chip (5), and the RS232 maintenance serial port (9) is connected with a Uart D interface on the processor chip (5); the wifi module (3) and the LORA module (4) are respectively connected with a Uart B interface and a Uart C interface on the processor chip (5) through RS232 communication interfaces;
external current analog signals are acquired through the acquisition module (1), acquired values are calculated and stored in the FLASH storage module (6), data are transmitted to the WiFi module (3) and the LORA module (4) through the RS232 communication interface, historical data of the FLASH storage module (6) are read according to the data requirements of the WiFi module (3), and if data of current clamps arranged at other positions are needed, data are transmitted and read through the LORA module (4) and the current clamps at other positions;
the real-time current value of the low-voltage distribution line is detected by acquiring the analog semaphore output by the Ross coil through the processor chip (5), so that periodic average current data is obtained, the acquired average current data is transmitted through the LORA module (4) or data of current clamps arranged at other positions are summoned, the power consumption condition of the obtained power transmission line is transmitted to an intelligent peripheral terminal through the wifi module (3) through internal data analysis and calculation;
the acquisition module (1) is used for carrying out current real-time values of the power transmission line, calculating average values of the accumulated real-time values and carrying out data statistics with other equipment, so that the current power utilization condition of the line can be analyzed, the loss of the line can be preliminarily obtained, and the power utilization condition of the low-voltage power distribution line can be quickly reflected;
the method for collecting the external current analog signal, calculating the collected value and storing the collected value in the FLASH storage module (6) comprises the following steps:
when the intelligent wireless current clamp host generates an accumulated online for 15 minutes, collecting real-time current data through an AT7022E chip;
the host computer stores 96 data points of one day in a circular queue according to time sequence; calculating a queue head pointer and a queue tail pointer according to the read RTC value during interrupt initialization; then, when frozen data are generated, the frozen data are inserted into a queue by a queue tail pointer; one element space is less used in the appointed queue, the tail +1 of the queue is the head of the queue when the queue is full, and the queue is in an initialization state when the queue is empty; the queue tail pointer points to the next position of the queue tail element, is always empty, is inserted into the queue tail element when a new event occurs, and deletes the queue head element when the circulating queue is full, and an element space is empty and is inserted from the queue tail; and after the storage is finished, the timer task takes out 12 freezing current data points from the circular queue at the timing of 3 hours and stores the freezing current data points in a FLASH storage module (6).
2. The intelligent wireless current clamp of claim 1, wherein: the processor chip (5) is a chip with the model number of STM32F 407.
3. The intelligent wireless current clamp of claim 1, wherein: the main machine and the slave machines are arranged in a master-slave mode, networking communication can be achieved between the main machine and the plurality of the slave machines, the main machine and the slave machines can monitor current data of each measuring point in real time and perform data interaction with the main machine, the main machine analyzes power utilization information of users, abnormal power utilization users are screened, analysis results are transmitted to an intelligent peripheral terminal through a WiFi or BT short-distance wireless communication technology to be visually displayed, and the intelligent peripheral terminal can also be used for calculating and checking front and back multiplying power of a mutual inductor.
4. The intelligent wireless current clamp of claim 1, wherein: the WIFI module (3) is an industrial wireless control WiFi module, and the model is ESP 8266-12F.
5. The intelligent wireless current clamp of claim 1, wherein: the LORA module (4) adopts a wireless LoRa6100PRO module, the transmitting power reaches 1W, the relay routing function is supported, and the data can be transmitted by adopting serial port communication; and allocating one GPIO to carry out reset control on the GPIO.
6. The intelligent wireless current clamp of claim 1, wherein: the acquisition module (1) adopts the Ross coil, and the acquisition module (1) output 2V exchanges analog quantity, considers that the inside AD interface of gathering of CPU can only gather positive level, so need raise zero level to analog AC signal, and this circuit is through being 1.65V through one-level voltage follower to 3.3V partial pressure, increases output impedance, and the latter stage is connected the capacitor and is prevented dynamic load in the twinkling of an eye, can restrain the high frequency interference of reference source simultaneously.
7. The intelligent wireless current clamp of claim 2, wherein: through the dry battery power supply, adopt the low-power consumption mode, inside STM32F407 chip adopts the dormancy mode to move, continues to keep the dormancy after gathering the low pressure distribution lines real-time value after the trigger STM32F407 chip arouses when the timer interrupt to reduce device CPU's operation power consumption, thereby the last operating time of extension device, the current pincers shell adopts insulating ABS material processing.
8. The electricity larceny prevention inspection method of the intelligent wireless current clamp according to claim 1, characterized in that:
the method comprises the following steps: the intelligent wireless current clamps are hung at different positions on two sides of a power supply line of a high-line-loss distribution room in a 1+ N mode to serve as an internet-of-things sensing monitoring device, and a host machine can complete internet-of-things data comparison with a plurality of sub machines hung according to levels;
step two: converting the current of the low-voltage distribution line into an analog voltage semaphore by adopting an acquisition module (1); analog voltage is collected through a processor chip (5) so as to obtain the electricity utilization condition of primary line current;
step three: collecting and transmitting current and average current of the current installation and other branch low-voltage distribution lines through LORA communication;
step four: the power utilization condition under the existing topological structure is analyzed by calculating and analyzing through a processor chip (5);
step five: uploading the data analyzed by the processor chip (5) through the WIFI module;
step six: the monitored current data is sent to an external terminal of a power utilization inspector in a wireless communication mode, so that input and output comparison data of the power supply line current in the high-line loss transformer area can be monitored, and whether a power stealing event occurs or not is analyzed.
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Cited By (3)
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|---|---|---|---|---|
| CN113075474A (en) * | 2021-03-24 | 2021-07-06 | 深圳供电局有限公司 | Electric energy measuring system and method |
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| CN113923126A (en) * | 2021-09-13 | 2022-01-11 | 国网浙江省电力有限公司湖州供电公司 | Four-way distribution network quality monitoring device and method thereof |
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