CN216771875U - Electric energy quality monitoring device of multichannel distributing type sampling - Google Patents
Electric energy quality monitoring device of multichannel distributing type sampling Download PDFInfo
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Abstract
The utility model provides a multichannel distributed sampling power quality monitoring device which comprises a power quality monitoring device body, wherein the power quality monitoring device body comprises a plurality of sampling modules and a data processing and displaying module; the sampling module comprises a sampling module RS485 interface, the data processing and displaying module comprises a data processing RS485 interface, and the sampling module RS485 interface of the sampling module is in communication connection with the data processing RS485 interface of the data processing and displaying module through an RS485 bus communication network; and the plurality of sampling modules respectively collect sampling signals on corresponding lines. The multi-channel distributed sampling power quality monitoring device can realize the functions of monitoring, storing, forwarding and interface displaying of conventional multi-channel power quality data, greatly reduce the debugging difficulty of field networking wiring construction, shorten the debugging construction period, greatly reduce the use amount of cables and further save the cost.
Description
Technical Field
The utility model belongs to the technical field of power quality monitoring, and particularly relates to a multichannel distributed sampling power quality monitoring device.
Background
In an on-line power quality monitoring system of a power line in a transformer substation, each multi-channel on-line power quality monitoring device can monitor power quality parameters of 6 lines at most simultaneously, and sampling input signals of each channel are three-phase voltage and three-phase current of the secondary side of each line. As shown in fig. 1, the conventional networking method is to install a multi-channel power quality online monitoring device on a power quality monitoring screen of a substation distribution room, and connect secondary side three-phase voltage and current lines of each line to be monitored to the computer quality monitoring screen.
At present, when a computer quality monitoring screen cabinet in a transformer substation is networked, electric energy quality data on 6 lines are often required to be monitored simultaneously, and secondary side three-phase voltage and current signal lines distributed in various places in the transformer substation need to be uniformly wired to an electric energy quality monitoring screen. 8 cables are distributed on each three-phase voltage and current line, 6 lines are monitored on each cable simultaneously, and therefore the cable demand is up to 48, so that the following problems can be caused:
1. the distribution range of each line is wide, so that networking wiring is inconvenient;
2. the quantity of cables in the power quality screen cabinet is large, and wiring in the screen cabinet is difficult;
3. a large number of cables need to be laid on the site, so that the construction and debugging period of the project is greatly prolonged;
4. the field cables are in great quantity demand, and project cost is not reduced favorably.
Disclosure of Invention
The utility model aims to solve the problems and provides a multichannel distributed sampling electric energy quality monitoring device which can realize convenient wiring, reduce wiring difficulty and greatly reduce project cost.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a multi-channel distributed sampling power quality monitoring device comprises a power quality monitoring device body, wherein the power quality monitoring device body comprises a plurality of sampling modules and a data processing and displaying module; the sampling module comprises a sampling module RS485 interface, the data processing and displaying module comprises a data processing RS485 interface, and the sampling module RS485 interface of the sampling module is in communication connection with the data processing RS485 interface of the data processing and displaying module through an RS485 bus communication network; and the plurality of sampling modules respectively collect sampling signals on corresponding lines. The electric energy quality monitoring device comprises a sampling module and a data processing and displaying module, wherein the sampling module and the data processing and displaying module are in communication connection through an RS485 bus communication network, and the RS485 bus communication network only needs 2 shielding cables, so that the electric energy quality monitoring device is convenient to wire, simple in wiring, capable of reducing wiring difficulty and greatly reducing cost.
Furthermore, the single sampling module respectively collects sampling signals on one corresponding line; the sampling module is installed in the secondary side screen body of the line to be monitored, and the data processing and displaying module is installed in the power quality monitoring screen. According to the utility model, one sampling module acquires an alternating current sampling signal on a corresponding line, each sampling module is installed in a secondary side screen body of the line to be monitored, and the middle of each sampling module is communicated with a data processing and displaying module in an electric energy quality monitoring screen through a high-speed RS485 bus.
Furthermore, the sampling module also comprises a sampling module CPU circuit and a sampling module RS485 level conversion circuit.
Further, the sampling module CPU circuit includes a first CPU chip U1A, a second CPU chip U1B, and a high-speed synchronous sampling chip for sampling an 8-channel analog signal at the same time.
Further, the first CPU chip U1A includes an STM32F765ZGT6 chip, the second CPU chip U1B includes an STM32F765ZGTx chip, and the high-speed synchronous sampling chip includes an AD7606 chip. The CPU of the sampling module of the utility model selects STM32F765 chip, the serial port communication rate can reach 10M, and the high-speed synchronous sampling chip in the module selects AD7606 chip, and can simultaneously sample analog signals of 8 channels to reduce wiring.
Further, sampling module RS485 level conversion circuit includes first chip U13, sampling module RS485 interface is connected to first chip U13, sampling module CPU circuit is connected to first chip U13's input, two way 485 signals of output of first chip U13 are connected to sampling module RS485 interface and with data processing display module.
Furthermore, the data processing and displaying module also comprises a data processing CPU circuit and a data processing RS485 level conversion circuit. The data processing and displaying module can collect and process the data of each sampling module through the high-speed RS485 interface, and realizes the functions of data storage, display, forwarding and the like.
Further, the data processing CPU circuit comprises a second CPU chip and a plurality of connectors, wherein the second CPU chip is connected with the plurality of sampling modules and/or the data processing RS485 level conversion circuit through the connectors; the second CPU chip includes an AM3356 chip. The CPU of the data processing and displaying module adopts an AM3356 chip, and the serial port communication speed can reach 12M.
Further, the data processing RS485 level conversion circuit comprises a second chip U3, the second chip U3 is connected with the data processing RS485 interface, the input end of the second chip U3 is connected with the data processing CPU circuit, and the output end of the second chip U3 outputs two channels of 485 signals to the data processing RS485 interface and is connected with the sampling module.
Furthermore, the RS485 bus communication network comprises a high-speed RS485 level conversion chip and is formed by connecting the data processing RS485 interface with each sampling module RS485 interface. The data processing and displaying module and the plurality of sampling modules form an RS485 bus communication network through a high-speed RS485 level conversion chip, and the RS485 bus communication network realizes the 10M communication rate between the data processing and displaying module and the plurality of sampling modules through self-defined protocol scheduling, thereby realizing the high-speed communication between the data processing and displaying module and the plurality of sampling modules.
Compared with the prior art, the utility model has the advantages that:
the multi-channel distributed sampling power quality monitoring device can realize the functions of monitoring, storing, forwarding and interface displaying of conventional multi-channel power quality data, greatly reduces the difficulty in field networking wiring construction debugging and shortens the debugging period; the use amount of cables on the project is greatly reduced, so that the project cost is saved.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model.
Drawings
FIG. 1 is a schematic diagram of an existing online monitoring device for power quality of a power line;
FIG. 2 is a schematic diagram of the operation of a multi-channel distributed sampling power quality monitoring device according to the present invention;
FIG. 3 is a schematic diagram of the communication between the data processing demonstration module and the plurality of sampling modules of the present invention;
FIG. 4 is a circuit schematic of the sampling module CPU circuit of the present invention;
FIG. 5 is a circuit schematic diagram of the sampling module RS485 level shift circuit of the present invention;
FIG. 6 is a circuit schematic of the data processing CPU circuit of the present invention;
fig. 7 is a circuit schematic of the data processing RS485 level shifter circuit of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
As shown in fig. 2 and fig. 3, the multichannel distributed sampling power quality monitoring device of the present embodiment includes a power quality monitoring device body, where the power quality monitoring device body includes a plurality of sampling modules and a data processing and displaying module; the sampling module comprises a sampling module RS485 interface, the data processing and displaying module comprises a data processing RS485 interface, and the sampling module RS485 interface of the sampling module is in communication connection with the data processing RS485 interface of the data processing and displaying module through an RS485 bus communication network; and the plurality of sampling modules respectively collect sampling signals on corresponding lines. This embodiment power quality monitoring devices includes sampling module and data processing show module, and middle RS485 bus communication network communication connection that passes through, RS485 bus communication network only need 2 shield cables to it is convenient to realize the wiring, and the wiring is pleasing to the eye in the screen, reduces the wiring degree of difficulty, greatly reduce cost.
In this embodiment, a single sampling module respectively collects sampling signals on a corresponding line; the sampling module is installed in the secondary side screen body of the line to be monitored, and the data processing and displaying module is installed in the power quality monitoring screen. In the embodiment, a sampling module collects alternating current sampling signals on a line, a high-speed RS485 serial port communication mode is adopted for communication between the sampling module and a data processing and displaying module, each sampling module is installed in a secondary side screen body of the line to be monitored, and the middle of the sampling module is communicated with the data processing and displaying module in the power quality monitoring screen through a high-speed RS485 bus communication network.
The RS485 bus communication network comprises a high-speed RS485 level conversion chip and is formed by connecting the data processing RS485 interface with each sampling module RS485 interface. The data processing and displaying module and the sampling modules form an RS485 bus communication network through a high-speed RS485 level conversion chip, the RS485 bus communication network is scheduled through a user-defined protocol, and 10M communication speed between the plates is achieved, so that high-speed communication between the data processing and displaying module and the sampling modules is achieved.
As shown in fig. 4, the sampling module of this embodiment further includes a sampling module CPU circuit and a sampling module RS485 level conversion circuit. The sampling module CPU circuit comprises a first CPU chip U1A, a second CPU chip U1B and a high-speed synchronous sampling chip for simultaneously sampling 8-channel analog signals. The sampling module of this embodiment can carry out analog signal high-speed sampling with the three-phase voltage current signal on the monitoring line to carry out algorithm operation such as Fourier through sampling module CPU circuit, obtain each item electric energy quality data, through internal communication agreement, through RS485 bus communication network, with data upload to data processing display module, sampling module's external communication interface is sampling module RS485 interface.
The first CPU chip U1A of this embodiment includes an STM32F765ZGT6 chip, the second CPU chip U1B includes an STM32F765ZGTx chip, and the high-speed synchronous sampling chip includes an AD7606 chip. The CPU of the sampling module of the embodiment selects STM32F765 of ST company, the serial port communication rate of the CPU can reach 10M, the high-speed synchronous sampling chip in the module selects AD7606 chip of ADI company, the analog signal sampling of 8 channels can be carried out simultaneously, and the sampling rate of each cycle wave can reach 1024 points.
As shown in fig. 5, the sampling module RS485 level conversion circuit of this embodiment includes a first chip U13, the first chip U13 is connected to the sampling module RS485 interface, the input end of the first chip U13 is connected to the sampling module CPU circuit, and the output end of the first chip U13 outputs two channels of 485 signals to the sampling module RS485 interface and is connected to the data processing display module. The sampling module RS485 interface of each sampling module of this embodiment links to each other with the data processing RS485 interface of data processing display module, constitutes an RS485 bus communication network, through the internal data communication agreement, receives the communication instruction from data processing display module, with the all kinds of electric energy quality data of each sampling module collection and calculation, transmit data processing display module.
The data processing and displaying module further comprises a data processing CPU circuit and a data processing RS485 level conversion circuit. The data processing and displaying module can collect and process data of each sampling module through a high-speed RS485 interface and an internal communication protocol, and functions of data storage, display, forwarding and the like are achieved.
As shown in fig. 6, the data processing CPU circuit of this embodiment includes a second CPU chip and a plurality of connectors, where the second CPU chip is connected to a plurality of sampling modules and/or a data processing RS485 level conversion circuit through the connectors; the second CPU chip includes an AM3356 chip. The CPU, i.e., the second CPU chip of the data processing and displaying module of this embodiment selects an AM3356 chip of TI corporation, the main frequency of the chip can reach 800 mps, the DDR memory 512M is operated, the external expansion storage space can reach 16GB, and the serial port communication rate can reach 12M. In the data processing and displaying module and the sampling module, the TTL serial port level is converted into the RS485 differential level by the high-speed RS485 level conversion chip, the differential signal has strong anti-electromagnetic interference performance, long-distance communication can be realized, and the communication rate of the high-speed RS485 level conversion chip can reach 16M. In the embodiment, the data of the sampling module is transmitted to the data processing and displaying module through the RS485 interface of the sampling module through an efficient user-defined communication protocol, so that the high-speed reliable data communication between the data processing and displaying module and the sampling modules is realized.
As shown in fig. 7, the data processing RS485 level conversion circuit in this embodiment includes a second chip U3, the second chip U3 is connected to the data processing RS485 interface, an input end of the second chip U3 is connected to the data processing CPU circuit, and an output end of the second chip U3 outputs two channels of 485 signals to the data processing RS485 interface and is connected to the sampling module. The data processing RS485 interface of the data processing display module is connected with the RS485 interface of each sampling module to form an RS485 bus communication network, various communication instructions are sent to each sampling module from the data processing display module through an internal data communication protocol, and various collected and calculated electric energy quality data are uploaded to the data processing display module by each sampling module.
When the utility model is used for field installation and wiring, only one RS485 bus communication network needs to be arranged. The six-channel power quality on-line monitoring device can monitor power quality data of six lines simultaneously, only one power quality data processing and displaying module and six acquisition modules are needed through the networking layout of the multi-channel distributed sampling power quality monitoring device, one acquisition module is respectively arranged on a secondary side screen cabinet of each monitoring line, and one RS485 bus communication network is adopted for communication in the middle. The functions of monitoring, storing, forwarding and interface displaying of the power quality data of the six lines can be realized, the requirements of users are met, and meanwhile, the on-site construction debugging difficulty and the debugging period are greatly reduced, so that the project cost is greatly reduced.
The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the utility model as defined in the appended claims.
Claims (10)
1. A multi-channel distributed sampling power quality monitoring device comprises a power quality monitoring device body, and is characterized in that the power quality monitoring device body comprises a plurality of sampling modules and a data processing and displaying module; the sampling module comprises a sampling module RS485 interface, the data processing and displaying module comprises a data processing RS485 interface, and the sampling module RS485 interface of the sampling module is in communication connection with the data processing RS485 interface of the data processing and displaying module through an RS485 bus communication network; and the plurality of sampling modules respectively collect sampling signals on corresponding lines.
2. The power quality monitoring device with multi-channel distributed sampling according to claim 1, wherein a single sampling module respectively collects sampling signals on a corresponding line; the sampling module is installed in the secondary side screen body of the line to be monitored, and the data processing and displaying module is installed in the power quality monitoring screen.
3. The power quality monitoring device with multi-channel distributed sampling according to claim 1, wherein the sampling module further comprises a sampling module CPU circuit and a sampling module RS485 level conversion circuit.
4. The power quality monitoring device with multi-channel distributed sampling according to claim 3, wherein the sampling module CPU circuit comprises a first CPU chip U1A, a second CPU chip U1B and a high-speed synchronous sampling chip for sampling 8-channel analog signals simultaneously.
5. The multi-channel distributed sampling power quality monitoring device according to claim 4, wherein the first CPU chip U1A comprises an STM32F765ZGT6 chip, the second CPU chip U1B comprises an STM32F765ZGTx chip, and the high-speed synchronous sampling chip comprises an AD7606 chip.
6. The power quality monitoring device with multi-channel distributed sampling according to claim 3, wherein the sampling module RS485 level conversion circuit comprises a first chip U13, the first chip U13 is connected with the sampling module RS485 interface, the input end of the first chip U13 is connected with the sampling module CPU circuit, and the output end of the first chip U13 outputs two 485 signals to the sampling module RS485 interface and is connected with the data processing and displaying module.
7. The multi-channel distributed sampling power quality monitoring device according to claim 1, wherein the data processing and displaying module further comprises a data processing CPU circuit and a data processing RS485 level conversion circuit.
8. The multi-channel distributed sampling power quality monitoring device according to claim 7, wherein the data processing CPU circuit comprises a second CPU chip and a plurality of connectors, the second CPU chip is connected with the plurality of sampling modules and/or the data processing RS485 level conversion circuit through the connectors; the second CPU chip includes an AM3356 chip.
9. The device according to claim 7, wherein the data processing RS485 level conversion circuit comprises a second chip U3, the second chip U3 is connected with a data processing RS485 interface, an input end of the second chip U3 is connected with a data processing CPU circuit, and an output end of the second chip U3 outputs two 485 signals to the data processing RS485 interface and is connected with the sampling module.
10. The multi-channel distributed sampling power quality monitoring device according to claim 1, wherein the RS485 bus communication network comprises a high-speed RS485 level conversion chip and is formed by connecting the data processing RS485 interface with each sampling module RS485 interface.
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| CN202123395931.0U CN216771875U (en) | 2021-12-30 | 2021-12-30 | Electric energy quality monitoring device of multichannel distributing type sampling |
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| CN202123395931.0U CN216771875U (en) | 2021-12-30 | 2021-12-30 | Electric energy quality monitoring device of multichannel distributing type sampling |
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