CN112748272A - Low-voltage electricity-stealing-prevention and metering abnormity remote online monitoring device - Google Patents
Low-voltage electricity-stealing-prevention and metering abnormity remote online monitoring device Download PDFInfo
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- CN112748272A CN112748272A CN202011638077.3A CN202011638077A CN112748272A CN 112748272 A CN112748272 A CN 112748272A CN 202011638077 A CN202011638077 A CN 202011638077A CN 112748272 A CN112748272 A CN 112748272A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
- G01R11/24—Arrangements for avoiding or indicating fraudulent use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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Abstract
本发明涉及一种低压反窃电及计量异常远程在线监测装置，包括主机和从机；主机包括主机MCU、主机取样模块、主机供电模块、显示模块、存储模块和主机通讯模块；主机MCU通过主机取样模块采集二次侧三相电流和二次侧三相电压，求得二次侧电流信息，并获取电能表内部电流信息，从机包括从机MCU、从机通讯模块、从机供电模块和第二柔性电流钳，从机通过第二柔性电流钳获取一次侧三相电流，求得一次侧电流信息，通过比对一次侧电流信息、二次侧电流信息和电能表内部电流信息监测用户计量是否正常，根据二次侧三相电压判断待测线路是否发生失压或欠压。与现有技术相比，本发明具有适用于监测各种窃电方式、可靠性高和实时性强等优点。
The invention relates to a low-voltage anti-electricity stealing and metering abnormal remote online monitoring device, comprising a host and a slave; the host comprises a host MCU, a host sampling module, a host power supply module, a display module, a storage module and a host communication module; the host MCU passes through the host computer. The sampling module collects the three-phase current of the secondary side and the three-phase voltage of the secondary side, obtains the current information of the secondary side, and obtains the internal current information of the electric energy meter. The slaves include the slave MCU, the slave communication module, the slave power supply module and the The second flexible current clamp, the slave obtains the three-phase current of the primary side through the second flexible current clamp, obtains the current information of the primary side, and monitors the user metering by comparing the current information of the primary side, the current information of the secondary side and the internal current information of the electric energy meter. Whether it is normal or not, according to the three-phase voltage on the secondary side, judge whether the line to be tested has lost voltage or undervoltage. Compared with the prior art, the present invention has the advantages of being suitable for monitoring various electricity stealing modes, high reliability and strong real-time performance.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to a low-voltage electricity-stealing-prevention and metering abnormity remote online monitoring device.
Background
In real life, enterprises and individuals are driven by illegal profit ideas to steal electricity so as to achieve the purpose of paying less or even not paying electricity, so that the countries and the electric power management enterprises suffer great economic loss, and the normal operation of a power grid is endangered, and the normal development of the electric power industry is hindered. With the serious investigation of the power stealing behaviors by the power supply department, more and more targeted power stealing means are provided, such as strong magnet power stealing, current loop power stealing, wire brush shielding material, change of the sampling resistance of the multifunctional electric meter and the like, the concealment is strong, the leakage amount is difficult to find, the strong magnet power stealing can lose 10% -90% of electric quantity, the current loop power stealing loses more than 50% of electric quantity, and the concealed power stealing means make the monitoring of the power supply department more difficult.
Most of the domestic current electricity stealing prevention technologies can effectively monitor electricity stealing modes only by aiming at one or part of electricity stealing modes, an electricity stealing prevention blind area exists, meanwhile, the electric power users who are suspected to steal electricity can only be subjected to assault detection, all the users cannot be monitored all day long, and the real-time performance is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a low-voltage electricity stealing prevention and metering abnormity remote online monitoring device.
The purpose of the invention can be realized by the following technical scheme:
a low-voltage electricity-stealing-prevention and metering abnormity remote online monitoring device comprises a host and a slave;
the host comprises a host MCU, and a host sampling module, a host power supply module, a display module, a storage module and a host communication module which are connected with the host MCU;
the host computer sampling module comprises a current transformer and a voltage transformer which are arranged on a circuit to be tested, the current transformer is connected with a first flexible current clamp, the host computer MCU respectively obtains a secondary side three-phase current and a secondary side three-phase voltage through the first flexible current clamp and the voltage transformer, and the host computer MCU is connected with the electric energy meter to obtain the internal current information of the electric energy meter;
the slave machine comprises a slave machine MCU, a slave machine communication module, a slave machine power supply module and a second flexible current clamp, wherein the slave machine communication module is connected with the slave machine MCU, the slave machine power supply module is connected with a circuit to be tested, the slave machine MCU is connected with the host machine MCU through the slave machine communication module, the slave machine MCU acquires primary side three-phase current through the second flexible current clamp, primary side current information is obtained through FFT operation according to the primary side three-phase current, and the primary side current information is sent to the host machine MCU;
the main machine MCU obtains secondary side current information through FFT operation according to the secondary side three-phase current, the primary side current information and the secondary side current information comprise frequency, amplitude, phase and harmonic wave, the main machine MCU obtains deviation by comparing the primary side current information, the secondary side current information and the internal current information of the electric energy meter, and when the deviation is larger than a set value, the fact that user metering is abnormal is judged;
and meanwhile, the host MCU judges whether the line to be tested has voltage loss or undervoltage according to the secondary side three-phase voltage.
Further, the device still include the sensor module that host computer MCU connects, sensor module including setting up temperature sensor, strong magnetic sensor, door switch sensor and the vibrations sensor on electric energy meter box, monitor electric energy meter box's temperature information, strong magnetic information, unpacking incident and vibrations incident respectively, realize preventing to steal the requirement of stealing the electricity, long-range looking for and stealing the back of stealing the electricity and collecting evidence.
Furthermore, the host communication module comprises a first master-slave communication unit, a mobile communication unit and a public network communication unit, the first master-slave communication unit is connected with the slave communication module, the mobile communication unit is connected with the mobile terminal, and the public network communication unit is connected with a computer terminal of the monitoring center.
Further, the first master-slave machine communication unit and the slave machine communication module adopt wireless transmission and power carrier or RS485 communication.
Furthermore, the host power supply module comprises a first lithium battery and a voltage conversion circuit, and the voltage conversion circuit is connected with the host communication module.
Furthermore, the first lithium battery is connected with the AC/DC power supply through a host charging circuit, the host charging circuit comprises a charging management chip and a charging indicator light, the electric quantity of the first lithium battery can be checked,
further, the first lithium battery is connected with the power transmission line through a mutual inductor.
Furthermore, the display module comprises a display MCU and a display connected with the display MCU, the display MCU is independently adopted to meet the requirement of a refresh rate, and the display MCU is responsible for processing display refresh and screen skip of the display.
The photoelectric pulse module comprises two pulse input interfaces and two pulse output interfaces which are connected with a host MCU, wherein one pulse input interface and one pulse output interface are connected with a main electric energy meter of the electric energy meter, and the other pulse input interface and one pulse output interface are connected with an auxiliary electric energy meter of the electric energy meter.
Further, the storage module include nonvolatile memory and second lithium cell, nonvolatile memory can long-term record measured data, data record when guaranteeing that host computer communication module can't communicate, the usable external power supply of second lithium cell supply power and charge, the nonvolatile memory still can work when guaranteeing that the circuit that awaits measuring is whole to lose voltage.
Furthermore, the slave power supply module comprises a solar battery, a third lithium battery, a slave charging circuit connected with the third lithium battery and a 3.3V power supply circuit, wherein the third lithium battery, the slave charging circuit and the solar battery are sequentially connected, and the ultra-long standby can be realized.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention collects the secondary side three-phase current and the secondary side three-phase voltage on the line to be measured by the host machine, collects the primary side three-phase current from the slave machine, obtains the primary side current information through FFT operation, and transmits the primary side current information to the host machine, the host machine MCU obtains the secondary side current information through FFT operation according to the secondary side three-phase current, and simultaneously the host machine MCU is connected with the electric energy meter to obtain the internal current information of the electric energy meter, the host machine MCU monitors whether the user measures the abnormity in real time by comparing the primary side current information, the secondary side current information and the internal current information of the electric energy meter on line, realizes closed-loop monitoring, is suitable for monitoring various electricity stealing modes, has high reliability, high automation degree and strong real-time performance, and can monitor whether the line to be measured has voltage loss or under, the method is rapid and accurate, and can be used in the field environment with serious waveform distortion;
(2) according to the invention, the temperature sensor, the strong magnetic sensor, the door switch sensor and the vibration sensor on the electric energy meter box respectively monitor the temperature information, the strong magnetic information, the box opening event and the vibration event of the electric energy meter box, so that the requirements of preventing electricity stealing, remotely checking electricity stealing and obtaining evidence after electricity stealing are met;
(3) the host communication module comprises a first master-slave machine communication unit, a mobile communication unit and a public network communication unit, wherein the first master-slave machine communication unit is connected with the slave communication module, the mobile communication unit is connected with a mobile terminal, the public network communication unit is connected with a computer end of a monitoring center, and data and reminding information can be checked and received in real time through the computer end and the mobile terminal;
(4) the display is connected with the display MCU, the host and the slave acquire data in real time, and the display MCU can improve the refresh rate of the display and is convenient for real-time monitoring;
(5) according to the invention, the two pulse input interfaces and the two pulse output interfaces are connected with the host MCU, wherein one pulse input interface and one pulse output interface are connected with the main electric energy meter of the electric energy meter, and the other pulse input interface and one pulse output interface are connected with the auxiliary electric energy meter of the electric energy meter, so that the main electric energy meter and the auxiliary electric energy meter of the electric energy meter can be calibrated at the same time, and the metering precision of the user electric energy meter is improved;
(6) the solar energy meter is provided with a nonvolatile memory and a second lithium battery, wherein the second lithium battery is connected with a solar charging panel, the nonvolatile memory can record measurement data for a long time, and ensures data recording when a host communication module cannot communicate, and the second lithium battery can be powered and charged by an external power supply and ensures that the nonvolatile memory can still work when all lines to be tested are in voltage loss;
(7) the slave power supply module comprises a solar battery, a third lithium battery, a slave charging circuit and a 3.3V power supply circuit, wherein the slave charging circuit and the 3.3V power supply circuit are connected with the third lithium battery, and the third lithium battery, the slave charging circuit and the solar battery are sequentially connected, so that the super-long standby can be realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a circuit diagram of a sample-and-amplify filter circuit;
FIG. 3 is a circuit diagram of a sample-and-amplify-and-integrate filter circuit;
FIG. 4 is a schematic diagram of a secondary side three-phase four-wire connection mode of a host;
FIG. 5 is a schematic diagram of a secondary side three-phase three-wire connection mode of a host;
fig. 6 is a schematic diagram of the primary side wiring of the slave.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A low-voltage electricity-stealing-prevention and metering abnormity remote online monitoring device is shown in figure 1 and comprises a host and a slave;
the host comprises a host MCU, and a host sampling module, a sensor module, a host power supply module, a display module, a storage module, a host communication module and a photoelectric pulse module which are connected with the host MCU;
the model of host computer MCU is STM32F4, is equipped with USB interface and RS485 interface on the host computer MCU, and the removal end accessible USB interface is connected with host computer MCU.
The host sampling module comprises a current transformer and a voltage transformer, the host MCU is connected with the current transformer through a first flexible current clamp, the secondary side three-phase current is collected, the first flexible current clamp is connected with the host MCU through a sampling amplification integral filter circuit, as shown in figure 3, the first flexible current clamp is connected with the host MCU through the sampling amplification integral filter circuit, the current signal output by the flexible current clamp is sampled, amplified, integrated and filtered in sequence to obtain the secondary side three-phase current and enters the host MCU, the host MCU obtains the secondary side current information through FFT operation according to the secondary side three-phase current, as shown in figure 2, the host MCU is connected with the voltage transformer through the sampling amplification filter circuit, the secondary side three-phase voltage is collected, the host MCU is connected with the electric energy meter to obtain the internal current information of the electric energy meter.
As shown in fig. 4, when the host sampling module adopts a three-phase four-wire connection mode, the host MCU collects secondary side voltages of the a phase, the B phase, the C phase and the zero phase of the tested line through 3 voltage transformers, and collects secondary side currents of the a phase, the B phase and the C phase of the tested line through 3 current transformers; as shown in fig. 5, when the host sampling module adopts a three-phase three-wire connection mode, the host MCU collects secondary side voltages of the a phase and the C phase through two voltage transformers, and collects secondary side currents of the a phase and the C phase through two current transformers.
And an ADC internal reference module is arranged in the host MCU and is used for collecting and converting signals input into the host MCU, and simultaneously sampling 1.5V ground signals SND and the voltage of the power supply module so as to correct the signals input into the host MCU.
Meanwhile, the host MCU is connected with an ADC external reference module, so that the accuracy of ADC acquisition and conversion is ensured, and the ADC external reference module is REF 2930.
The sensor module is used for monitoring abnormal events, and comprises a temperature sensor, a strong magnetic sensor, a door switch sensor and a vibration sensor, wherein the temperature sensor, the strong magnetic sensor and the meter box are respectively used for detecting the temperature, the strong magnetic and the meter box opening and vibration of the electric energy meter box. The temperature sensor is a temperature sensor LM75A with a high-speed I2C interface, can directly convert the temperature into a digital signal within the temperature range of-55 ℃ to +125 ℃, and can realize the accuracy of 0.125 ℃.
The host communication module comprises a first master-slave machine communication unit, a mobile communication unit and a public network communication unit, wherein the mobile communication unit adopts Bluetooth to realize communication with the mobile terminal. When abnormal monitoring events occur, the host MCU sends warning information to the mobile terminal through the mobile communication unit, and the host MCU is connected with a computer end of the monitoring center through the public network communication unit.
Host computer power module is including the AC/DC power that connects gradually, host computer charging circuit, first lithium cell and voltage conversion circuit, voltage conversion circuit includes voltage conversion chip and the MCU3V3 circuit and the VCC circuit of being connected with the voltage conversion chip, MCU3V3 circuit is other circuit power supplies except public network communication unit in the host computer, the VCC circuit is public network communication unit power supply, the voltage conversion chip is XC9216A33, convert the output voltage of first lithium cell into 3.3V, its maximum output current is 500 mA. The host charging circuit comprises a charging management chip and a charging indicator light, and the charging management chip is SLM 6500.
The storage module comprises a nonvolatile memory and a second lithium battery, the second lithium battery is connected with a solar charging panel, and the nonvolatile memory is used for storing data.
The photoelectric pulse module comprises two pulse input interfaces and two pulse output interfaces which are connected with a host MCU, and is used for calibrating the electric energy meter, the main electric energy meter of the electric energy meter is connected with one of the pulse input interfaces and one pulse output interface, the auxiliary electric energy meter of the electric energy meter is connected with the other pulse input interface and the other pulse output interface, the pulse level of the main electric energy meter and the auxiliary electric energy meter is sent into the pulse input interfaces through optical coupling isolation, the host MCU calculates the working electric energy of the main electric energy meter and the auxiliary electric energy meter according to the input pulse level, meanwhile, the host MCU receives the pulse output ports in a pulse level mode through the optical coupling isolation, and the simultaneous calibration of the main electric energy meter and the auxiliary electric energy meter is realized.
The host communication module comprises a first master-slave machine communication unit, a mobile communication unit and a public network communication unit, wherein the mobile communication unit adopts Bluetooth to realize communication with the mobile terminal. When an abnormal monitoring event occurs, the host MCU sends warning information to the mobile terminal through the mobile communication unit, the host MCU is connected with the computer end of the monitoring center through the public network communication unit, and data stored in the nonvolatile memory can be checked through the computer end of the monitoring center.
The display module comprises a display MCU and a display, the model of the display MCU is STM32F4, the host MCU is responsible for sampling and calculating voltage and current, in order to meet the requirement of voltage and current vector diagram refresh rate, the display MCU is responsible for processing display refresh and screen skip of the display, the display adopts a true color ILI9488 touch screen module, and the display MCU are communicated through a parallel port FSMC.
The slave machine comprises a slave machine MCU, a second flexible current clamp connected with the slave machine MCU, a slave machine communication module, a slave machine power supply module and an ADC external reference circuit.
As shown in fig. 6, the second flexible current clamp is connected to three phases of the power transmission line, the slave MCU is connected to the three phases of the power transmission line through the second flexible current clamp, the sampling amplification integration filter circuit is connected to the slave MCU, the slave MCU collects three-phase currents on the primary side through the second flexible current clamp and performs FFT operation according to the three-phase currents on the primary side to obtain current information on the primary side, and the slave communication module transmits the current information on the primary side to the first master-slave communication unit through wireless transmission communication.
The slave power supply module comprises a third lithium battery, a slave charging circuit connected with the third lithium battery and a 3.3V switching power supply circuit, the third lithium battery is connected with the solar battery through the slave charging circuit, and the 3.3V switching power supply circuit provides a 3.3V power supply for the slave MCU, the slave communication module and the ADC external reference circuit.
The main machine MCU obtains deviation by comparing the primary side current information, the secondary side current information and the internal current information of the electric energy meter, and judges that the metering of a user is abnormal when the deviation is greater than a set value;
and meanwhile, the host MCU judges whether the line to be tested has voltage loss or undervoltage according to the secondary side three-phase voltage.
The main machine MCU generates a voltage and current vector diagram according to the secondary side current information and the secondary side three-phase voltage, real-time 192 kinds of three-phase three-wire system and 2304 kinds of three-phase four-wire system wiring error judgment are carried out according to different load types of users, the compensation electric quantity calculation is carried out, and the display module displays the voltage and current vector diagram, the three-phase voltage, the current fundamental wave amplitude, the harmonic content rate, the power expression and the wrong wiring diagram of the line to be detected.
When the sensor module monitors that the electric energy meter box has an abnormal event, the host MCU records the abnormal event and sends reminding information to the mobile terminal through the Bluetooth.
Example 2
In this embodiment, the first lithium battery is connected to the power transmission line through a transformer, and the rest is the same as that in embodiment 1.
Example 3
In this embodiment, the first master-slave communication unit and the slave communication module communicate with each other through power line carriers.
Example 4
In this embodiment, the first master-slave communication unit and the slave communication module communicate with each other through an RS485 serial port.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433507A (en) * | 2021-06-22 | 2021-09-24 | 保定新云达电力设备有限责任公司 | Electric energy meter metering fault analysis system and analysis method |
| CN115390004A (en) * | 2022-08-24 | 2022-11-25 | 广东电网有限责任公司 | Method, apparatus, device and medium for determining state of metering device |
-
2020
- 2020-12-31 CN CN202011638077.3A patent/CN112748272A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113433507A (en) * | 2021-06-22 | 2021-09-24 | 保定新云达电力设备有限责任公司 | Electric energy meter metering fault analysis system and analysis method |
| CN113433507B (en) * | 2021-06-22 | 2023-02-07 | 保定新云达电力设备有限责任公司 | Electric energy meter metering fault analysis system and analysis method |
| CN115390004A (en) * | 2022-08-24 | 2022-11-25 | 广东电网有限责任公司 | Method, apparatus, device and medium for determining state of metering device |
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