CN209280821U - A kind of outer electric energy quality monitoring, recording instrument of household portable - Google Patents

Abstract

A portable outdoor power quality monitoring recorder, including an instrument case, which is characterized in that the instrument case is hinged by the case body and the case cover, and the hook fixed on the case body is movably connected with the lock buckle fixed on the case cover. There is a handle on the upper hinge, and a voltage and current measurement port is provided at the rear end of the box. There are a human-computer interaction module, a data acquisition and processing circuit and a GPRS module built in the box. The human-computer interaction module is electrically connected to the data acquisition and processing circuit. Data acquisition The processing circuit is electrically connected to the GPRS module, the display screen of the human-computer interaction module is placed on the upper end of the data acquisition and processing circuit, and the current measurement port of the data acquisition and processing circuit arranged at the rear end of the cabinet is electrically connected to the current sampling circuit through a sampling line, The voltage port of the data acquisition and processing circuit provided at the rear end of the cabinet is electrically connected to the voltage sampling circuit through a connection line. It has the advantages of simple structure, small size, light weight, complete testing functions, fully sealed, high reliability, and convenient use.

Description

A portable outdoor power quality monitoring recorder

technical field

The utility model relates to the field of monitoring and recording of low-voltage power quality in a power supply system, which is a portable outdoor power quality monitoring recorder.

Background technique

The existing power quality monitoring instruments can be roughly divided into three categories: the first category: remote monitoring instruments: installed in a fixed position, can be mounted outdoors, and can monitor the power system continuously for a long time without being on duty The main power quality indicators, and generate real-time data, and upload the data to the server by means of communication for power quality analysis. The disadvantage is that it is impossible to change the installation location of the equipment, and the power needs to be cut off during installation. If the equipment fails, it will affect the use of lower-level power equipment. The second category: fixed test instruments, used indoors, suitable for test stations, with high measurement accuracy, powerful analysis functions, no anti-theft function, and technicians cannot leave during the measurement. They can only measure power indicators in a short time without real-time data. Uploading, unattended long-term continuous power quality monitoring cannot be realized. The third category: fixed multi-functional analytical instruments. This type of instrument is characterized by intelligence, multi-function, large information capacity, and strong data processing functions. It is mainly suitable for on-site special tests. And can not carry out long-distance data transmission.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, to provide a simple structure, small size, light weight, complete test function, fully sealed, high reliability, easy to use, especially suitable for temporary or outdoor environments. Portable power quality monitoring recorder for short-term use.

The solution adopted to solve the technical problem is: a portable outdoor power quality monitoring recorder, which includes an instrument box, and is characterized in that the instrument box is hinged by the box body and the box cover, and the hook fixed on the box body is connected to the box cover. Fixed locking movable connection, hinged handle on the box, voltage and current measurement ports at the rear end of the box, built-in man-machine interaction module, data acquisition and processing circuit and GPRS module, human-computer interaction module It is electrically connected with the data acquisition and processing circuit, and the data acquisition and processing circuit is electrically connected with the GPRS module. The display screen of the human-computer interaction module is placed on the upper end of the data acquisition and processing circuit, and the current measurement port of the data acquisition and processing circuit is set at the rear end of the cabinet. The sampling line is electrically connected to the current sampling circuit, and the voltage port of the data acquisition and processing circuit provided at the rear end of the cabinet is electrically connected to the voltage sampling circuit through the connecting line.

The human-computer interaction module adopts the integrated ARM+DSP circuit inside the ATPAD screen of the ATS series model.

The microprocessor of the described data acquisition and processing circuit uses an ADE7880 chip.

The GPRS module is a USR-GM1 module.

The current sampling circuit uses a Y-FCT series Rogowski coil.

The voltage sampling circuit is an electrical fixture for A-phase voltage, B-phase voltage, C-phase voltage and N wire.

The instrument box is fully sealed, and the protection level is IP65, which is suitable for outdoor installation.

The utility model portable outdoor power quality monitoring recorder is beneficial in that:

1. Simple structure, small size, light weight, easy to carry, IP65 protection standard, can be used as outdoor temporary inspection test, and can also be used outdoors for a long time;

2. It has powerful functions and meets all the functions required by the national standard for power quality monitoring. High reliability of long-time online operation, convenient and practical on-site operation, no need to disconnect the tested line when connecting. Can communicate with the server, can record and store data for a long time and can read data by classification;

3. Long-distance and large-scale reliable networking of data can be realized;

4. Complete test functions, diversified analysis modes, waveform diagram, vector diagram, histogram and other display and analysis modes;

5. Data storage double backup can effectively ensure that data will not be lost.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the external structure of a portable outdoor power quality monitoring recorder;

Fig. 2 is the front schematic diagram of Fig. 1;

Fig. 3 is a schematic left view of Fig. 2;

Fig. 4 is a schematic block diagram of a portable outdoor power quality monitoring recorder;

Figure 5 is a schematic diagram of the current sampling circuit;

Fig. 6 is a schematic diagram of a voltage sampling circuit;

Fig. 7 is a schematic diagram of the data acquisition and processing circuit;

Figure 8 is a schematic diagram of the ADE7880 power supply connection circuit;

Fig. 9 is a schematic diagram of the principle of the human-computer interaction module;

Figure 10 is a schematic diagram of the principle of the GPRS module.

Detailed ways

Utilize accompanying drawing below to do further description to the utility model implementation:

Referring to Fig. 1-Fig. 3, the instrument case of a portable outdoor power quality monitoring recorder of the utility model can meet the requirements of the outdoor working environment. The hook fixed on the box body 1 and the lock buckle 3 fixed on the box cover 2 are used to connect the movable connection structure, and the box cover 2 can be fastened and locked when monitoring the power quality outdoors; the current set at the rear end of the box body 1 The measurement port 6 is electrically connected to the current sampling circuit through a sampling line, and the voltage port 5 provided at the rear end of the cabinet 1 is electrically connected to the voltage sampling circuit through a connecting line. Both the sampling line and the connection have waterproof and dustproof functions. The portable outdoor power quality monitoring recorder can reach the IP65 protection level when the hook fixed on the box body 1 is fastened with the lock buckle 3 fixed on the box cover 2 . A handle 4 is hinged on the box body 1 for easy carrying, and it can also be padlocked so that it has an anti-theft function when used outdoors.

Referring to Figure 4, the portable outdoor power quality monitoring recorder of the present invention adopts the data acquisition and processing circuit to collect the parameters of the power system, and then analyzes, displays and stores them through the human-computer interaction module, and the human-computer interaction module adopts the ATS series model The ATPAD screen uses an integrated ARM+DSP circuit inside, which can simplify the internal circuit of the entire instrument, thereby enhancing the anti-interference energy. It can still be used in harsh environments. The human-computer interaction module transmits the processed data to the background server via the Internet through the GPRS module. The collection of the current signal through the Rogowski coil of the current sampling circuit as a current sensor is a differential of the current to time, and through a circuit that integrates the output voltage signal, the input current can be truly restored. The data acquisition and processing circuit is mainly composed of a power supply circuit and a signal transmission circuit. The power supply circuit makes the power supply stable and reliable, and ensures the measurement accuracy; the signal transmission circuit is the bridge between the ADE7880 chip and the data processing chip, if the signal is not processed properly, the entire measurement result will be invalid.

Referring to FIG. 5 , the current sampling circuit has four Rogowski coils, and the Rogowski coils are directly connected to phases A, B, and C of the power line and the neutral line. When there is current flowing in the power line, the Rogowski coil generates a differential signal proportional to the current. The four circuits are the same, and one of the differential signals enters the resistors R71 and R70. The resistor R70, the capacitor C37, and the resistor R62 are connected. R71 and The capacitor C36 is connected, the other pins of the capacitors C36 and C37 are grounded, the other pin of the resistor R62 is connected with the capacitor C34 and the IAN of the ADE7880 chip, and the other pin of the resistor R63 and the capacitor C35 are jointly connected to the data acquisition and processing circuit The IAP of the advanced microprocessor ADE7880 chip forms a sampling circuit for reducing interference and step-down filtering. Then the microprocessor ADE7880 integrates the signal to obtain the current value. The microprocessor of the data acquisition and processing circuit uses an ADE7880 chip, which is a professional power quality monitoring microprocessor circuit.

Referring to Figure 6, the A-phase voltage, B-phase voltage, C-phase voltage and N of the voltage sampling circuit represent the connection of the three-phase electricity and the neutral line, and the three-phase voltages of A, B, and C are respectively connected to their respective voltage mutual inductance through resistors R72-R77 The positive pole of the transformer LCTV3PCE 2MA/2MA is connected to the negative pole of the transformer LCTV3PCE 2MA/2MA, and the strong signal is converted into a weak signal. Taking one of them as an example, the secondary side of the transformer is connected in parallel with R55 and connected to capacitor C25 through resistor R50, and the other end pin of capacitor C25 is connected to the negative pole of the secondary side of resistor R55 and then connected to the analog ground through resistor R11, where A, B, and C are three The positive pole of the phase is connected to the microprocessor ADE7880 of the data acquisition and processing circuit after being processed by the above-mentioned low-pass filter. Microprocessor ADE7880 contains DSP, which can calculate a series of parameters such as voltage, current effective value, power factor, active power, reactive power, electric energy metering, voltage swell and slump, etc.

Referring to Figure 7, the HR pin of the microprocessor ADE7880 of the data acquisition and processing circuit is connected to the VIA pin of the chip U11 ADUM3401 four-channel digital isolator, and the IRQ1 pin of the microprocessor ADE7880 is connected to the chip U11 ADUM3401 four-channel digital isolator. The VIB pin is connected, the IRQ0 pin of the microprocessor ADE7880 is connected to the VIC pin of the chip U11 ADUM3401 four-channel digital isolator, the SCLK pin of the microprocessor ADE7880 is connected to the VOD pin of the chip U11 ADUM3401 four-channel digital isolator , The RESET pin of the microprocessor ADE7880 is connected to the VEI pin of the ADUM3401 four-channel digital isolator of the chip U11 after adding R1 in the middle and connected to the digital ground through the capacitor C1 on the RESET side, and the MOSI pin of the microprocessor ADE7880 is connected to the chip U12 The VOA pin of the ADUM3401 four-channel digital isolator is connected, the SS/CS pin of the microprocessor ADE7880 is connected to the VOB pin of the chip U12 ADUM3401 four-channel digital isolator, and the MISO pin of the microprocessor ADE7880 is connected to the chip U12 ADUM3401 four Connect to the VID pin of the channel digital isolator. The chip ADUM3401 can eliminate the problems of uncertain current transfer ratio, nonlinear transfer function, and temperature and service life effects that optocoupler isolators usually have. When the signal data rate is equivalent, the power consumption of the device is only 1/ of that of the optocoupler. 10 to 1/6, thereby reducing power consumption. The other side communicates with the human-computer interaction module, and transmits the parameters to the human-computer interaction module for further analysis and processing. The VOA pin of the chip U11ADUM3401 four-channel digital isolator is connected to the HR terminal of the industrial intelligent touch display ATS043/ATS70 integrated circuit of the human-computer interaction module, and the VOB pin of the chip U11 ADUM3401 four-channel digital isolator is connected to the ATS043/ The IRQ1 terminal of the ATS70 integrated circuit, the VOC pin of the chip U11 ADUM3401 four-channel digital isolator is connected to the IRQ0 terminal of the ATS043/ATS70 integrated circuit, and the VID pin of the chip U11 ADUM3401 four-channel digital isolator is connected to the ATS043/ATS70 integrated circuit The SCLK terminal of the chip U12, the VIA pin of the ADUM3401 four-channel digital isolator is connected to the MOSI terminal of the ATS043/ATS70 integrated circuit, and the VIB pin of the chip U12 ADUM3401 four-channel digital isolator is connected to the CS of the ATS043/ATS70 integrated circuit Terminals, the VIC pin of the chip U12 ADUM3401 four-channel digital isolator is connected to the CSI terminal of the ATS043/ATS70 integrated circuit, the VOD pin of the chip U12 ADUM3401 four-channel digital isolator is connected to the MISO terminal of the ATS043/ATS70 integrated circuit, The power supply of U11 and U12 ADUM3401 four-channel digital isolator is 3.3V used by ADE7880, and a 104 capacitor is added between the power supply VDD and GND.

Referring to Figure 8, it is the power supply circuit of the microprocessor ADE7880 chip. Capacitors C3, C2, C6, and C13 are connected in parallel between the VDD pin and the DGND pin of the microprocessor ADE7880 chip, and a 3.3V DC power supply is connected to the VDD side to enter the chip. The VO pin of the 7150; the HAS pin and the PM0 pin of the microprocessor ADE7880 are connected to VDD at the positive pole, and the 1K resistor R4 is connected to the negative pole side and grounded through the light-emitting diode. The V1 pin of the chip 7150 is connected to a 5V DC power supply, and the output power is controlled by controlling the voltage level of the enable terminal En pin, so that the circuit structure is simple, and it is less affected by power fluctuation interference, and the measurement results of power supply stability are accurate. The human-computer interaction module adopts the industrial intelligent touch display ATS043/ATS70 produced by Beijing Aichuan Technology Co., Ltd. This module integrates rich resources, such as ARM9 processor, touch screen, general IO, multi-channel AD, UART/485, file system, Buzzer, indicator light, etc.

Referring to Fig. 9, J1 is a UART interface connected to the GPRS communication module, J2 is a power supply and 485 interface, J9 is an AD interface, and J10 is an IO interface connected to the signal output terminal of the microprocessor ADE7880.

Referring to Figure 10, the GPRS module uses the USR-GM1 module to realize long-distance and large-capacity networking of data. The GPRS module uses a 5V DC power supply that is independently produced by Tenap Energy Saving Technology Co., Ltd. and is commercially available. The 5V DC power supply adopts a circuit with ultra-low ripple coefficient and power supply noise. The GPRS module is connected with the human-computer interaction module through the UART interface. The main function of the GPRS module is to communicate data with the server through wireless. The screen UART interface of the human-computer interaction module is directly connected to UATR TXD and UART TXD. In this way, the uploaded or downloaded data in GPRS can be read and written.

The specific implementations of the present utility model are not exhaustive, and those skilled in the art should fall within the scope of protection of the present utility model without simple copying and improvement of creativity.

Claims (6)

1. A portable outdoor power quality monitoring recorder, which comprises an instrument case, is characterized in that the instrument case is hinged by the case body and case cover, and the fixed grab hook on the case body is movably connected with the fixed lock catch on the case cover, A handle is hinged on the box body, and voltage and current measurement ports are provided at the rear end of the box body. A human-computer interaction module, a data acquisition and processing circuit and a GPRS module are built in the box body, and the human-computer interaction module is electrically connected to the data acquisition and processing circuit. , the data acquisition and processing circuit is electrically connected to the GPRS module, the display screen of the human-computer interaction module is placed on the upper end of the data acquisition and processing circuit, and the current measurement port of the data acquisition and processing circuit is set at the back end of the box through the sampling line and the current sampling circuit Electrically connected, the voltage port of the data acquisition and processing circuit provided at the rear end of the cabinet is electrically connected with the voltage sampling circuit through a connection line. 2. A kind of portable outdoor electric energy quality monitoring recorder according to claim 1, it is characterized in that, described man-machine interaction module adopts the ATPAD screen of ATS series model to use integrated ARM+DSP circuit inside. 3. A kind of portable outdoor power quality monitoring recorder according to claim 1, is characterized in that, the microprocessor of described data collection and processing circuit uses ADE7880 chip. 4. A portable outdoor power quality monitoring recorder according to claim 1, wherein the GPRS module is a USR-GM1 module. 5. A portable outdoor power quality monitoring recorder according to claim 1, wherein said current sampling circuit uses a Y-FCT series Rogowski coil. 6. A portable outdoor power quality monitoring recorder according to claim 1, characterized in that, said voltage sampling circuit is an electrical fixture for A-phase voltage, B-phase voltage, C-phase voltage and N wire.