CN219179495U - Laboratory load intelligent monitoring device - Google Patents

Abstract

The intelligent monitoring device for the laboratory load comprises a WIFI communication module, a GPS positioning module, a current transformer, a voltage transformer, a three-phase electric energy metering module, a microprocessor module, a leakage current detection module and a temperature detection module; the three-phase alternating current line is respectively connected with the current transformer, the voltage transformer and the temperature detection module; the three-phase electric energy metering module receives the voltage and current signals acquired on the three-phase alternating current line and then uploads the processed voltage and current signals to the microprocessor module; the microprocessor module is electrically connected with the WIFI communication module, the WIFI communication module and the leakage current detection module. The utility model can monitor the running state of the power supply line of the laboratory in the office area at all times, and provides the collected field information to the intelligent terminal through the Internet, thereby facilitating the first time of the staff to comprehensively master the power consumption conditions of the laboratory in the office area in the future city of the national network, and ensuring the reliability and the safety of the power supply of the laboratory to the maximum extent.

Description

Laboratory load intelligent monitoring device

Technical Field

The utility model discloses a monitoring device, and particularly relates to an intelligent monitoring device for office laboratory load.

Background

The power load is an important factor influencing the operation of the power system, the operation state of the power load is detected, the problems are timely and effectively regulated, and the operation stability of the power system can be effectively improved. For a long time, the power load is generally checked by adopting a method of regular maintenance and daily inspection, but because of the time difference of manual inspection, the manual inspection is insufficient, the generated problems are easily ignored, and the more serious problem of influencing the normal operation of the power system is further caused.

The laboratory has high requirements on the reliability of power supply of power distribution equipment, and the power failure can cause serious influence. The future urban office area of the national network is provided with an experiment group A seat and an experiment group B seat, and the building is internally provided with a national key experiment unit, a Beijing urban key experiment unit, a national network key experiment unit and other experiment platforms of each unit research institute. Each experimental platform item is different, the experimental time is different, the load in the experiment is very uncertain, and if the equipment and the materials are lost due to the power failure in the midway, the serious influence can be generated, so that the requirement on the safety and the reliability of power supply is very high.

The prior art, such as CN105933460A, discloses an intelligent power supply monitoring system for a college electronic circuit laboratory, which comprises a power supply monitoring terminal, a network coordination platform and a mobile terminal; the intelligent power supply monitoring system configures corresponding power supply monitoring terminals according to the number of teaching power supplies in a college electronic circuit laboratory, and the power supply monitoring terminals are responsible for independent and real-time data acquisition, analysis and processing of the working state of each teaching power supply and then transmit field parameters and fault information to a network coordination platform; the network coordination platform is responsible for carrying out centralized management and message forwarding on all power supply monitoring terminal equipment deployed in an electronic circuit laboratory, and transmitting data from the power supply monitoring terminal to the mobile terminal; the mobile terminal is in charge of receiving and displaying on-site parameters reflecting the working state of the teaching power supply and alarm information; the power supply monitoring terminal comprises a sensor module, a microcontroller, an electrically erasable programmable read-only memory, an integrated WiFi chip and a power supply module; the sensor module, the electrically erasable programmable read-only memory and the integrated WiFi chip are respectively connected with the microcontroller; the power module is unified to the sensor module, the microcontroller and the electrically erasable programmable read-only memory, and the integrated WiFi chip is used for carrying out data acquisition and processing on working parameters of the monitored power supply by the power distribution sensor module and transmitting the working parameters to the microcontroller; the microcontroller performs digital-to-analog conversion and digital filtering on the analog signals from the sensor, and transmits the obtained data to the EEPROM; the EEPROM is responsible for storing data from the microcontroller; the integrated WiFi chip reads data stored in the read-only memory by the microcontroller from the electrically erasable programmable read-only memory at regular time, establishes Internet connection with the network coordination platform in a wireless station mode, and transmits the data to the network coordination platform. However, the prior art system is relatively complex in structure, and does not employ a three-phase power metering module to perform data processing on the collected ac signals, thereby increasing the signal processing task of the microcontroller in the monitoring system.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model discloses an intelligent monitoring device for laboratory load, which has the following technical scheme:

the intelligent monitoring device for the laboratory load comprises a current transformer, a voltage transformer, a temperature detection module, a three-phase electric energy metering module, a microprocessor monitoring terminal module, a leakage current detection module, a GPS positioning module, a WIFI communication module and an intelligent terminal; the method is characterized in that: the power alternating current power supply line is connected with a current transformer, a voltage transformer and a temperature detection module in series; the three-phase electric energy metering module receives the voltage and current signals acquired on the electric power alternating current power supply line and then uploads the processed voltage and current signals to the microprocessor monitoring terminal module; the microprocessor monitoring terminal module is electrically connected with the GPS positioning module, the leakage current detection module and the output end of the temperature detection module; and the microprocessor monitoring terminal module is in wireless communication with the intelligent terminal through the WIFI communication module.

Preferably, it is: the microprocessor monitoring terminal module adopts an STM32F103VCT6 chip; the three-phase electric energy metering module adopts an ATT7022B metering chip, and the WIFI communication module adopts an ESP8266WIFI wireless transmission module.

Preferably, it is: the microprocessor monitoring terminal module STM32F103VCT6 chip and the three-phase electric energy metering module ATT7022B metering chip are in serial communication through SPI; and the STM32F103VCT6 chip is communicated with the ESP8266WIFI wireless transmission module through a serial port.

Preferably, it is: the current and voltage signals collected on the power alternating current power supply line are modulated, filtered and subjected to data processing through an A/D converter in the ATT7022B of the metering chip to obtain specific power parameter values of current, voltage and power.

Preferably, it is: the three-phase electric energy metering module selects 5V direct current voltage output by a 220V switching power supply to supply power, and an output pin end of the 5V direct current voltage output by the 220V switching power supply is provided with a 10uF capacitor which is connected in parallel with a 0.1uF capacitor for decoupling.

Preferably, it is: the ATT7022B chip comprises 7 paths of A/D conversion channels, and a bias voltage of 2.4V standard voltage is added to an input pin of each A/D channel; the 2.4V standard voltage is provided by the REFOUT pin of the ATT7022B chip, and the REFOUT pin sets a pull-up resistor, the pull-up resistor size being selected between lk and 10 k.

Preferably, it is: the current transformer is 50A/5mA in transformation ratio and is of the model DL-CT1005A; the current transformer is in a primary side perforation mode, and a secondary side sampling resistor of the current transformer selects a metal film resistor with power of 1/4W and resistance value of 20 ohms; the voltage transformer is 2mA/2mA in the type of TV31B02; the secondary side of the resistor has a sampling power of 1/4W and a resistance value of 250 European metal film resistance.

Preferably, it is: the leakage current detection module adopts a Hall current sensor, samples current signals acquired by the Hall current sensor through a resistor, and then transmits voltage signals subjected to second-order active low-pass filtering treatment through an amplifying circuit consisting of an operational amplifier to an HCNR200 linear optocoupler circuit after obtaining leakage current signals of 0-250 mV through a follower circuit and a signal matching circuit.

Preferably, it is: the temperature detection module includes a thermocouple sensor.

Advantageous effects

The utility model can monitor the running state of the power supply line of the laboratory in the office area at all times, and provides the collected on-site electric information to the intelligent terminal through the Internet, thereby facilitating the first time of the staff to comprehensively master the power consumption conditions of the laboratory in the office area in the future city of the national network, and ensuring the reliability and the safety of the power supply of the laboratory to the maximum extent.

Drawings

FIG. 1 is a schematic diagram of the intelligent laboratory load monitoring device.

Fig. 2 is a schematic diagram of a portion of signal acquisition according to the present utility model.

Description of the embodiments

The intelligent monitoring device for the laboratory load comprises a current transformer, a voltage transformer, a temperature detection module, a three-phase electric energy metering module, a microprocessor monitoring terminal module, a leakage current detection module, a GPS positioning module, a WIFI communication module and an intelligent terminal; the method is characterized in that: the power alternating current power supply line is connected with a current transformer, a voltage transformer and a temperature detection module in series; the three-phase electric energy metering module receives the voltage and current signals acquired on the electric power alternating current power supply line and then uploads the processed voltage and current signals to the microprocessor monitoring terminal module; the microprocessor monitoring terminal module is electrically connected with the GPS positioning module, the leakage current detection module and the output end of the temperature detection module; and the microprocessor monitoring terminal module is in wireless communication with the intelligent terminal through the WIFI communication module. The microprocessor monitoring terminal module adopts a STM32F103VCT6 chip; the three-phase electric energy metering module adopts an ATT7022B metering chip.

The working process of the three-phase electric energy metering module is as follows: the three-phase electric energy metering module ATT7022B is used for receiving voltage and current signals collected on an electric power alternating current power supply line of a laboratory in a future city office area of a national network, firstly, an A/D converter is used for digitally sampling input current and voltage signals, and then a digital signal processing module in the three-phase electric energy metering module ATT7022B is used for modulating and filtering the digital signals to obtain specific electric power parameter values of the current, the voltage and the power after data processing: the acquired voltage signals are phase-shifted by ninety degrees and then multiplied by corresponding currents to obtain required reactive power; the reactive power and the active power are calculated to obtain corresponding apparent power, the electric energy is obtained through integration of voltage-current product (power), and the various parameter data are automatically stored in the corresponding internal register module (the above is designed in the metering chip, and the metering chip is not required to be processed by engineering technicians, so that the collected voltage and current signals can be directly input to the input end of the chip). A meter calibration register is arranged in the chip and used for storing meter calibration parameters; the measurement data reading and the meter calibrating parameter setting are realized by an external microprocessor monitoring terminal module through an SPI communication interface.

The three-phase electric energy metering module ATT7022B selects the 5V direct current voltage output by the 220V switching power supply as power supply, and the 5V power supply pin end is configured with a 10uF capacitor to be connected with an O.luF capacitor in parallel for decoupling so as to enhance the disturbance rejection capability and the stability of the system. When the SPI adopted by the ATT7022B chip realizes data communication, the chip adopts four pins as follows: SDI (data in), SDO (data out), SCLK (clock), CS (chip select):

(1) The SDO corresponds to the DOUT port in the ATT7022B chip, and the slave data output function realizes reading of the register data in the ATT 7022B.

(2) The SDI corresponds to a DIN port in the ATT7022B chip, and realizes writing of corresponding data, commands, address information, and the like into the ATT7022B from the device data input function.

(3) SCLK is the SPI clock signal pin in ATT7022B, produces the clock pulse signal through STM32F103VCT6 chip, controls the speed of data transmission in the SPI communication process. When the rising edge of the clock signal arrives, the data in ATT7022B is output through the DOUT pin, and when the falling edge of the clock signal arrives, the data in DIN is uploaded into ATT 7022B.

(4) CS is a chip selection signal of SPI communication in the ATT7022B chip, when the CS pin level is changed from high level to low level, the SPI starts working, otherwise, the SPI works.

The signal acquisition process on the power alternating current power supply line is as follows: the utility model adopts a voltage transformer and a current transformer to complete the sampling of voltage and current signals at the front end, converts high voltage and large current into small voltage and small current signals, then adds the signals into a signal input channel of an ATT7022B metering chip through resistor isolation matching and filtering, and then completes the sampling work of voltage and current through internal A/D conversion. The VxP and VxN pins in the ATT7022B metering chip are sampling signal A/D channel input ends, and filters consisting of a 1.2k resistor and an O.OlpF capacitor are respectively arranged on the pins in order to ensure that the sampling signals are not distorted; the ATT7022B chip comprises 7 paths of A/D conversion channels, a bias voltage of 2.4V is added to an input pin of each A/D channel, and a standard voltage of 2.4V is provided by a REFOUT pin; the REFOUT pin needs to be added with a pull resistor, if the resistance value of the selection resistor is larger, the power consumption is reduced, but the driving current is correspondingly reduced, and if the resistance value of the selection resistor is smaller, the driving current can be ensured, but the power consumption is increased, and the chip is burnt out due to overlarge current. The pull-up resistor size is empirically chosen between lk and 10k, ultimately choosing a pull-up resistor of 10 k.

The current sampling circuit on the alternating current power supply line adopts a current transformer with the transformation ratio of 50A/5mA, and the model of the current transformer is DL-CT1005A (of course, the transformation ratio and the model are determined according to specific conditions, only one embodiment is adopted here, and engineering technicians adopt different transformation ratios and corresponding models according to field requirements and application scenes). The primary side of the current transformer is in a perforation mode, and a load live wire (A or B or C) directly passes through a transformer hole when in on-site wiring. When the load current is 50A, the secondary side of the current transformer outputs 5mA, and the secondary side sampling resistor of the transformer takes a high-precision metal film resistor with the power of 1/4W and the resistance value of 20Q.

The voltage sampling circuit on the alternating current power supply line adopts a voltage transformer, the transformation ratio is 2mA/2mA, and the model is TV31B02; the primary side standard current of the selected transformer is 2mA, and the transformer is connected with a current limiting resistor in series and then connected to phase voltage when in use. Since the input phase voltage is 220V, the voltage on the secondary side is 0.5V, and the high-precision metal film resistor with the power of 1/4W and the resistance value of 250Q is selected.

The main task of the leakage current detection module is to detect the output grounding leakage current of the power supply device, the utility model is realized by adopting a Hall current sensor, and a positive power supply cable and a negative power supply cable in a direct current power supply system both pass through a primary side detection hole of the Hall current sensor positioned in the branch; according to the technical condition requirements, the leakage current detection module needs to collect direct current signals of 0-300 mA, firstly, the current signals collected by the Hall current sensor are sampled through resistors, then the weak signals are amplified through an amplifying circuit formed by an operational amplifier and second-order active low-pass filtering, the fluctuation amount of noise signals is reduced, and the output impedance is reduced to the minimum, because the ADC module of the microprocessor needs as small as possible output impedance to meet the precision requirement when processing the rapidly-changed analog signals; the filtered voltage signal is subjected to a voltage follower circuit and a signal matching circuit to obtain a leakage current signal of 0-250 mV, and the leakage current signal is transmitted to an HCNR200 linear optocoupler circuit at the rear end; the HCNR200 can achieve accurate voltage isolation measurements where the output signal is automatically adjusted to a low side supply common mode voltage of no more than 3.3V. After the common-mode voltage is output, the signals are modulated into TTL signals with the voltage range of 0-3.3V through a differential operational amplifier circuit, and the TTL signals enter the input end of an analog-to-digital converter ADC, and finally the analog-to-digital conversion of the signals is completed.

At present, the common wireless communication modes in the power load monitoring system comprise NRF2401 transmission, RS232 wireless transmission, ZIGBEE transmission, bluetooth transmission, WIFI transmission and other modes, the NRF2401 transmission mode has lower power consumption, the hardware circuit design is simple, but the transmission distance is shorter, and the transmission rate is lower; the RS232 wireless transmission mode and the ZIGBEE transmission mode are stable in transmission, but the transmission distance is short and the transmission speed is slow; the transmission distance of the Bluetooth wireless transmission is short, and the anti-interference capability is weak. The utility model adopts a WIFI wireless transmission mode, has high transmission speed, stability, reliability and better compatibility, can work in various modes, adopts an ESP8266WIFI wireless transmission module, and adopts a 3.3V power supply mode. And the STM32F103VCT6 chip of the microprocessor monitoring terminal module is connected with the pin of the ESP8266WIFI module through the serial port 2, and the STM32F103VCT6 chip controls the ESP8266WIFI wireless transmission module through the AT instruction to complete electric energy monitoring data transmission of the microprocessor monitoring terminal to the monitoring terminal. The working process is as follows: STM32F103VCT6 sends the instruction to the WIFI, accomplishes the initialization function of WIFI module, then, the WIFI module is connected the internet, establishes the connection with monitor terminal, confirms the connection success after, sends electric energy data package to monitor terminal.

The utility model also adds a GPS positioning module which is used for realizing the positioning function of the microprocessor monitoring terminal, and the STM32F103VCT6 chip is connected with the GPS positioning module through a serial port to realize the reading of the position information of the microprocessor monitoring terminal. The temperature monitoring on the AC power supply line is realized by adopting a conventional thermocouple mode, and the collected temperature data is uploaded to a microprocessor after being processed so as to realize the monitoring of the line temperature.

The communication process between the microprocessor monitoring terminal and the monitoring terminal is as follows: the STM32F103VCT6 chip sends an initialization instruction connected with the Internet to the WIFI module, so that handshake communication with the monitoring terminal is realized; then, the STM32F103VCT6 chip sends an instruction to the GPS module, GPS positioning is carried out on the monitoring equipment, and the positioned data are put into a register; the user can initiate a meter calibrating instruction through the monitoring terminal, and the meter calibrating instruction comprises digital compensation of each phase voltage gain, power gain, current gain, phase, setting of starting current, phase failure threshold voltage and the like; when the ATT7022B chip collects power parameters, the collected power parameters are uploaded to the STM32F103VCT6 microprocessor for classification and processing, and the STM32F103VCT6 microprocessor sends corresponding instructions to the WIFI module; STM32F103VCT6 sends the power monitoring data and the device position information in the register to the monitoring terminal. The user can check in real time through the monitoring terminal; meanwhile, the STM32F103VCT6 microprocessor sends the relevant electric energy parameters to a monitor terminal display screen for display through a Modbus communication protocol.

The utility model realizes power supply monitoring and power running state monitoring of a laboratory in a future urban office area of the national network, manages and prevents power utilization safety according to areas, and improves the electric safety of each power utilization area in the management area. Through measurement and calculation, the device is installed in a set of equipment with low cost investment, the running condition of the equipment can be monitored in real time, equipment faults are avoided, equipment damage and power failure loss of experimental projects due to faults are avoided, equipment maintenance cost is reduced, and economic benefits are improved; the intelligent monitoring device for the power load of the laboratory is installed and used, so that the manual frequent inspection times are greatly saved in the aspect of power distribution equipment management, the high efficiency is achieved for equipment safety management by monitoring the power consumption operation data in real time, the labor cost and the equipment failure rate are greatly reduced, and a foundation is laid for equipment safety power consumption service guarantee work; the intelligent monitoring device for the power load of the laboratory can be widely applied and can be installed in an important equipment power inlet wire distribution cabinet. The power supply inlet wire of the power distribution cabinet is required to have enough space, the inside is clean and tidy, the network signals of surrounding environment equipment are good, and regular inspection and maintenance are required. The intelligent monitoring device for the power load of the laboratory is arranged in a workshop of the B seat 108 of the laboratory group, and is high in accuracy and high in reliability of measuring and transmitting data through observation of the running condition of actual equipment, the probability of equipment failure damage and electrical accidents is greatly reduced, and the intelligent monitoring device is expected to be installed and implemented in other laboratories or other important equipment power supplies in other areas, so that the safe electricity utilization reliability of the equipment is guaranteed. The device can also be used for application installation in other centers which need to focus on monitoring of power distribution equipment. Through improving the reliability of intelligent management level and operation safety of the power supply and distribution system of the important laboratory, the stable operation of the power supply and distribution system of the park is ensured, and more reliable service guarantee is provided for owners.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (9)

1. The intelligent monitoring device for the laboratory load comprises a current transformer, a voltage transformer, a temperature detection module, a three-phase electric energy metering module, a microprocessor monitoring terminal module, a leakage current detection module, a GPS positioning module, a WIFI communication module and an intelligent terminal; the method is characterized in that: the power alternating current power supply line is connected with a current transformer, a voltage transformer and a temperature detection module in series; the three-phase electric energy metering module receives the voltage and current signals acquired on the electric power alternating current power supply line and then uploads the processed voltage and current signals to the microprocessor monitoring terminal module; the microprocessor monitoring terminal module is electrically connected with the GPS positioning module, the leakage current detection module and the output end of the temperature detection module; and the microprocessor monitoring terminal module is in wireless communication with the intelligent terminal through the WIFI communication module.

2. The intelligent laboratory load monitoring device according to claim 1, characterized in that: the microprocessor monitoring terminal module adopts an STM32F103VCT6 chip; the three-phase electric energy metering module adopts an ATT7022B metering chip; and the WIFI communication module adopts an ESP8266WIFI wireless transmission module.

3. The intelligent laboratory load monitoring apparatus according to claim 2, characterized in that: the microprocessor monitoring terminal module STM32F103VCT6 chip and the three-phase electric energy metering module ATT7022B metering chip are in serial communication through SPI; and the STM32F103VCT6 chip is communicated with the ESP8266WIFI wireless transmission module through a serial port.

4. The intelligent laboratory load monitoring apparatus according to claim 2, characterized in that: the current and voltage signals collected on the power alternating current power supply line are modulated, filtered and subjected to data processing through an A/D converter in the ATT7022B of the metering chip to obtain specific power parameter values of current, voltage and power.

5. The intelligent laboratory load monitoring apparatus according to claim 2, characterized in that: the three-phase electric energy metering module selects 5V direct current voltage output by a 220V switching power supply to supply power, and an output pin end of the 5V direct current voltage output by the 220V switching power supply is provided with a 10uF capacitor which is connected in parallel with a 0.1uF capacitor for decoupling.

6. The intelligent laboratory load monitoring apparatus according to claim 2, characterized in that: the ATT7022B chip comprises 7 paths of A/D conversion channels, and a bias voltage of 2.4V standard voltage is added to an input pin of each A/D channel; the 2.4V standard voltage is provided by the REFOUT pin of the ATT7022B chip, and the REFOUT pin sets a pull-up resistor, the pull-up resistor size being selected between lk and 10 k.

7. The intelligent laboratory load monitoring device according to claim 1, characterized in that: the current transformer is 50A/5mA in transformation ratio and is of the model DL-CT1005A; the structure of the current transformer is a primary side perforation mode, and a secondary side sampling resistor of the current transformer is a metal film resistor with the power of 1/4W and the resistance value of 20 ohms; the voltage transformer is 2mA/2mA in the type of TV31B02; the secondary side of the resistor has a sampling power of 1/4W and a resistance value of 250 European metal film resistance.

8. The intelligent laboratory load monitoring device according to claim 1, characterized in that: the leakage current detection module adopts a Hall current sensor, samples current signals acquired by the Hall current sensor through a resistor, and then transmits voltage signals subjected to second-order active low-pass filtering treatment through an amplifying circuit consisting of an operational amplifier to an HCNR200 linear optocoupler circuit after obtaining leakage current signals of 0-250 mV through a follower circuit and a signal matching circuit.

9. The intelligent laboratory load monitoring device according to claim 1, characterized in that: the temperature detection module includes a thermocouple sensor.

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