Connection structure for electric energy quality on-line monitoring device

Abstract

The utility model relates to a connecting structure used for an electric energy quality on-line monitoring device, the device comprises a front surface cover and a housing, the structure comprises two installation supports and a plurality of guide plates, the guide plates are installed on the housing, an installation groove is formed between adjacent guide plates, the installation supports are installed in the installation grooves, and the front surface cover is arranged on the housing. The shell comprises a first threaded hole, the installation support comprises a second threaded hole and a second fixing piece, the first threaded hole is connected with the second threaded hole, and the front face cover is fixed to the shell through the second fixing piece. According to the utility model, the first threaded hole and the guide plate are arranged on the shell, the second threaded hole and the second fixing plate are arranged on the mounting bracket, the mounting bracket is mounted in the guide plate, the front cover is fixed through the second fixing plate, and the first threaded hole and the second threaded hole are fixed through the screw; and the fixation of the shell and the front cover is realized.

Description

Technical Field

[0001] This utility model relates to the technical field of connection structure for online power quality monitoring devices, and in particular to a connection structure for online power quality monitoring devices. Background Technology

[0002] Online power quality monitoring devices can monitor parameters such as voltage, current, and power factor of the power grid in real time, promptly detect power quality problems such as overload, voltage fluctuations, and frequency deviations, and issue timely alarm signals to ensure the safe operation of new power systems. Currently, there are many brands of online power quality monitoring devices on the market. Some are derived from multi-function meters, with power quality-related measurement parameters provided by imported metering chips and displayed using traditional black-and-white dot-matrix LCDs. Others use a DSP plus ARM multi-processor solution, where multiple chips collaboratively calculate power quality data, but the display uses a large monochrome LCD screen. However, users cannot intuitively distinguish phases and abnormal data during use.

[0003] Utility model patent CN219201798U discloses a novel online power quality monitoring device, including a housing, a front cover and a rear panel mounted on the housing, and an interface board, a power board, a control board, and a sampling board mounted inside the housing. Its distinguishing feature is the inclusion of a support and guide structure within the housing that provides limiting support and guidance for the installation of the power board, control board, and sampling board. The housing also includes a fixing plate for mounting and securing the interface board. This utility model, through the support and guide structure, provides limiting support for the power board, control board, and sampling board, and guides them to their respective positions on the interface board, facilitating their installation. However, the support and guide structure is complex and lacks a secure method for fixing the housing to the front cover.

[0004] Therefore, providing a connection structure that can reliably fix the shell and the front cover is an urgent problem to be solved. Utility Model Content

[0005] The purpose of this invention is to overcome the defects of the existing technology and provide a connection structure for an online power quality monitoring device.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] According to one aspect of the present invention, a connection structure for an online power quality monitoring device is provided. The device includes a front cover and a housing. The structure includes two mounting brackets and multiple guide plates. The guide plates are mounted on the housing, and mounting grooves are formed between adjacent guide plates. The mounting brackets are mounted in the mounting grooves. The housing includes a first threaded hole, and the mounting brackets include a second threaded hole and a second fixing plate. The first threaded hole and the second threaded hole are connected. The front cover is fixed to the housing by the second fixing plate.

[0008] As a preferred technical solution, the guide plate is installed on both sides of the housing, and the cross-section of the guide plate is T-shaped.

[0009] As a preferred technical solution, the mounting bracket further includes a first positioning piece and a mounting plate, wherein the second threaded hole is installed in the mounting plate and the first positioning piece is installed in the guide plate.

[0010] As a preferred technical solution, the mounting plate and the first positioning piece are perpendicular.

[0011] As a preferred technical solution, the first threaded hole is installed in the middle of adjacent guide plates, and the second threaded hole and the first threaded hole are coaxial.

[0012] As a preferred technical solution, the device further includes a card slot, which is installed inside the housing.

[0013] As a preferred technical solution, the device further includes a control board, a sampling board, and a power board, all of which are installed in a slot.

[0014] As a preferred technical solution, the device further includes a liquid crystal panel, a bus board, and a support board, wherein the liquid crystal panel and the bus board are respectively mounted on both sides of the support board, and the support board is mounted on the housing.

[0015] As a preferred technical solution, the LCD panel includes indicator lights, buttons, and an LCD module made of color LCD screen.

[0016] As a preferred technical solution, the device further includes a rear cover plate, which is mounted on the housing.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This utility model achieves the fixation of the housing and the front cover by providing a first threaded hole and a guide plate on the housing, providing a second threaded hole and a second fixing plate on the mounting bracket, installing the mounting bracket in the guide plate, fixing it to the front cover by the second fixing plate, and fixing the first threaded hole and the second threaded hole with screws.

[0019] 2. The guide plate of this utility model has a T-shaped cross-section, and adjacent guide plates form an installation groove. A first fixing plate is provided on the mounting bracket. The installation groove can guide the first fixing plate to be installed smoothly and provide support for the mounting bracket.

[0020] 3. The card slot of this utility model can be set to multiple slots, and the installation position can be selected according to the needs of the control board, sampling board and power board, which is more flexible.

[0021] 4. The liquid crystal module of this utility model is a color liquid crystal, which has advantages such as high resolution, rich colors, intuitive real-time information display, graphical interface, user-friendly human-computer interaction, and scalability and flexibility compared with traditional black and white dot matrix liquid crystal and monochrome large screen liquid crystal. Attached Figure Description

[0022] Figure 1 This is an exploded view of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the mounting bracket of this utility model;

[0024] Figure 3 This is a schematic diagram of the overall structure of the module of this utility model.

[0025] 1. Front cover; 2. LCD panel; 3. Bus board; 4. Control board; 5. Sampling board; 6. Power board; 7. Bracket board; 8. Mounting bracket; 9. Housing; 10. Rear cover; 11. Guide plate; 12. Slot; 13. First positioning piece; 14. Mounting plate; 15. Second positioning piece. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0027] With technological advancements, the proportion of new energy sources such as wind power and photovoltaics in the energy system structure is continuously increasing. The power generation, grid, load, and storage system requires precise matching of supply and demand to maximize the utilization of clean energy. However, this scheduling and adjustment process can lead to grid fluctuations. Online power quality monitoring devices can monitor grid parameters such as voltage, current, and power factor in real time, promptly detecting power quality issues such as overload, voltage fluctuations, and frequency deviations. They also issue timely alarms to ensure the safe operation of the new power system. Currently, there are many brands of online power quality monitoring devices on the market. Some are derived from multi-function meters, with power quality-related measurement parameters provided by imported metering chips and displayed using traditional black-and-white dot-matrix LCDs. Others use a DSP plus ARM multi-processor solution, where multiple chips collaboratively calculate power quality data, but the display uses a large monochrome LCD screen. However, users cannot intuitively distinguish phases and abnormal data during use; these devices also require securing the casing and front cover, as well as the circuit board within the cabinet.

[0028] This invention provides a connection structure for an online power quality monitoring device. The device features a first threaded hole and a guide plate on the housing, and a second threaded hole and a second fixing plate on the mounting bracket. The mounting bracket is installed in the guide plate, and the second fixing plate secures it to the front cover. The first and second threaded holes are then fixed with screws, thus securing the housing and the front cover. The guide plate has a T-shaped cross-section, with adjacent guide plates forming a mounting groove. The mounting bracket has a first fixing plate, and the mounting groove guides the first fixing plate smoothly and provides support for the mounting bracket. Multiple slots can be provided, allowing for flexible installation based on the needs of the control board, sampling board, and power board. The LCD module is a color LCD, offering advantages over traditional black-and-white dot-matrix LCDs and monochrome large-screen LCDs, including high resolution, rich colors, intuitive real-time information display, a graphical interface, user-friendly human-computer interaction, and scalability and flexibility.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, a connection structure for an online power quality monitoring device is disclosed. The device includes a front cover 1 and a housing 9. The structure includes two mounting brackets 8 and multiple guide plates 11. The guide plates 11 are mounted on the housing 9, and mounting grooves are formed between adjacent guide plates 11. The mounting brackets 8 are mounted in the mounting grooves. The housing 9 includes a first threaded hole, and the mounting brackets 8 include a second threaded hole and a second fixing plate 15. The first threaded hole and the second threaded hole are connected. The front cover 1 is fixed to the housing 9 by the second fixing plate 15.

[0031] The guide plate 11 is installed on both sides of the housing 9, and the cross-section of the guide plate 11 is T-shaped.

[0032] The mounting bracket 8 also includes a first positioning piece 13 and a mounting plate 14, the second threaded hole is installed in the mounting plate 14, and the first positioning piece 13 is installed in the guide plate 11.

[0033] The mounting plate 14 and the first positioning piece 13 are perpendicular.

[0034] The first threaded hole is installed in the middle of the adjacent guide plate 11, and the second threaded hole is coaxial with the first threaded hole.

[0035] The device also includes a slot 12, which is installed inside the housing 9.

[0036] In this embodiment, multiple guide plates 11 are provided on the outer surface of the housing 9. The cross-section of the guide plates 11 is T-shaped. Adjacent guide plates 11 form mounting grooves with the cooperation of the housing 9. The first fixing piece 13 is installed under the guidance of the mounting groove. At the same time, the mounting groove fixes the mounting bracket 8 by fixing the first fixing piece 13. The housing 9 and the mounting bracket 8 are respectively provided with a first threaded hole and a second threaded hole. The first threaded hole and the second threaded hole are aligned and fixed with screws to clamp the second fixing piece 15 and the front cover 1, thus finally fixing the housing 9 and the front cover 1. The drilling position of the first threaded hole can be freely selected according to the position to be fixed. The first threaded hole and the second threaded hole can be aligned by simply installing the mounting bracket 8 in different mounting grooves.

[0037] In addition, multiple slots 12 are provided inside the housing 9. Different slots can be selected according to the needs. The slots 12 can be installed on both sides inside the housing and opposite to the position where the guide plate 11 is installed in the housing 9, which facilitates the setting of the first threaded hole.

[0038] The device also includes a control board 4, a sampling board 5, and a power board 6, all of which are installed in the slot 12.

[0039] The device also includes a liquid crystal panel 2, a bus board 3, and a bracket plate 7. The liquid crystal panel 2 and the bus board 3 are respectively installed on both sides of the bracket plate 7, and the bracket plate 7 is installed on the housing 9.

[0040] The LCD panel 2 includes indicator lights, buttons, and an LCD module made of color LCD screen.

[0041] The device also includes a rear cover plate 10, which is mounted on the housing 9.

[0042] In this embodiment, the support plate 7 is made of aluminum alloy and provides support. The sampling board 5 consists of a current transformer, a voltage transformer, and an ADC module, which converts voltage and current signals into digital signals. The power supply board 6 consists of a switch input module, a relay output module, and a power supply module. The power supply module provides 5V power for the device's operation and 24V power for the relays. The control board 4 consists of a dual-ARM core processor with integrated FPGA, a clock module, an Ethernet module, an RS485 module, a USB module, and a storage module. The bus board 3 connects the sampling board, power supply board, and control board. The LCD panel 2 consists of an LCD module, indicator lights, and buttons, specifically a 5-inch color LCD, 9 buttons, and 8 indicator lights. The device can monitor 4 voltage inputs, 4 current inputs, and 5 switching inputs. The device has 4 alarm relay outputs and 1 device abnormality relay output. The device communication includes 2 Ethernet interfaces, 2 RS485 interfaces, and 1 USB interface.

[0043] The overall assembly method of this utility model is as follows: The LCD panel 2 is fixed to the front side of the aluminum alloy support plate 7 with screws. The bus board 3 is then fixed to the back side of the aluminum alloy support plate 7. The assembled aluminum alloy support plate 7 is then fixed to the housing 9 with screws. The control board 4, sampling board 5, and power board 6 are sequentially inserted into their corresponding slots 12. The front cover 1 is fixed to the aluminum alloy support plate 7 with screws. Finally, the rear cover 10 is fixed to the housing 9 to complete the assembly of the entire device. The device is an embedded installation. During installation, the two mounting brackets 8 are inserted into the mounting slots 11 on the upper and lower sides of the housing 9 and fixed with screws to complete the embedded installation.

[0044] The modular architecture of this utility model is as follows: Figure 3 As shown, the core chip uses the XC7Z010 based on the Zynq-7000 architecture. This chip integrates a feature-rich dual-core ARM Cortex-A9 processing system and programmable logic (FPGA). The FPGA is responsible for hardware driving, including controlling the AD chip to acquire voltage and current transformer data at a frequency of 51.2KHz, simulating LTDC driving, IIC driving, serial port driving, network port driving, and memory driving.

[0045] The ARM1 runs embedded software responsible for performing basic calculations on the acquired voltage and current signals, including FFT, half-cycle RMS calculation, and full-wave RMS calculation. It then uses the calculated data to determine alarms for voltage sags and dips, short-term voltage interruptions, flicker, transients, harmonic exceedances, inrush current, imbalance, and voltage deviation. Upon detecting an alarm, the ARM1 records the corresponding alarm information and fault waveform, and controls the relay outputs on the power board and illuminates indicator lights via the FPGA.

[0046] The ARM0 runs the Linux operating system and includes functions such as file system, network protocol, graphical interface, statistical calculation, and system parameter management.

[0047] The file system includes the FTP file transfer protocol, which facilitates user program upgrades, waveform data storage and export, statistical data compressed storage in PQDIF format, and SOE records.

[0048] The network protocols include IEC61850 and Modbus RTU / TCP for accessing the backend monitoring system, WebService for users' daily maintenance and data viewing, and SNTP network time synchronization protocol and IRIG-B hardware time synchronization protocol to ensure that the system's time synchronization accuracy reaches ±1ms.

[0049] Statistical operations refer to the statistical applications performed on the data generated by the ARM1. Real-time data is packaged into 3-second data sets for display in 150-cycle units. The 150-cycle data is then statistically analyzed again to generate one-minute statistical data, including the maximum, minimum, average, and the 95% probability high value. Alarm information is statistically analyzed to generate pass rate statistics files, alarm count records, and daily statistics files.

[0050] System parameter management includes factory calibration coefficient management, user setting configuration, saving Ethernet, RS485, and SNTP communication parameter settings, AD channel mapping configuration, relay output mapping configuration, operation log management, and access control.

[0051] The graphical interface includes the design of the web-based web interface and the color LCD interface. The LCD design fully considers the power system environment, employing a 5-inch color LCD with an 800*400 resolution, which not only affects the system's aesthetics but also its usability and information transmission efficiency.

[0052] The primary color scheme is blue, which conveys a sense of technology and trust. White and light blue are used for text menu information to enhance visual depth and richness.

[0053] The event log menu uses red to indicate critical alarms, yellow to indicate minor alarms, and white to indicate general alarms, based on the urgency of the alarm, to achieve information hierarchy and highlight important information.

[0054] The spatial layout is categorized and easy for users to find and understand. The first-level menu includes event logs, user settings, system settings, device debugging, real-time data, and power quality. Real-time data and power quality data should be distinguished. Real-time data is conventional power data, including three-phase voltage, current, energy, power, and switch status. Power quality data includes harmonics, interharmonics, harmonic power, harmonic energy, imbalance, deviation, fluctuation, and flicker.

[0055] Clicking the button moves the highlighted blue selection box, and confirming the selection results in the data being highlighted, providing users with immediate interactive feedback. Harmonic data can be viewed in both bar charts and tables, and the phase angle of the three-phase power supply can be viewed as a vector diagram. Furthermore, to increase clarity, the power industry's standard yellow, green, and red colors are used to differentiate between A, B, and C phase data.

[0056] The common selection between the ARM0 and ARM1 cores is achieved through shared memory. When ARM1 needs to retrieve data from ARM0, it writes the requested data to the shared memory and sets the corresponding flag, triggering an ARM0 interrupt. The ARM0 interrupt function is responsible for recognizing the ARM1 request, placing the requested data into the shared memory, and notifying ARM1 that it is allowed to retrieve the data.

[0057] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A connection structure for an online power quality monitoring device, the device comprising a front cover (1) and a housing (9), characterized in that, The structure includes two mounting brackets (8) and multiple guide plates (11). The guide plates (11) are mounted on the housing (9), and mounting grooves are formed between adjacent guide plates (11). The mounting brackets (8) are mounted in the mounting grooves. The housing (9) includes a first threaded hole, and the mounting brackets (8) include a second threaded hole and a second fixing plate (15). The first threaded hole and the second threaded hole are connected. The front cover (1) is fixed to the housing (9) by the second fixing plate (15).

2. The connection structure for an online power quality monitoring device according to claim 1, characterized in that, The guide plate (11) is installed on both sides of the housing (9), and the cross-section of the guide plate (11) is T-shaped.

3. The connection structure for an online power quality monitoring device according to claim 1, characterized in that, The mounting bracket (8) further includes a first positioning piece (13) and a mounting plate (14), the second threaded hole is installed in the mounting plate (14), and the first positioning piece (13) is installed in the guide plate (11).

4. The connection structure for an online power quality monitoring device according to claim 3, characterized in that, The mounting plate (14) and the first positioning piece (13) are perpendicular.

5. The connection structure for an online power quality monitoring device according to claim 1, characterized in that, The first threaded hole is installed in the middle of the adjacent guide plate (11), and the second threaded hole and the first threaded hole are coaxial.

6. The connection structure for an online power quality monitoring device according to claim 1, characterized in that, The device also includes a slot (12) which is installed inside the housing (9).

7. The connection structure for an online power quality monitoring device according to claim 6, characterized in that, The device also includes a control board (4), a sampling board (5), and a power board (6), all of which are installed in a slot (12).

8. The connection structure for an online power quality monitoring device according to claim 1, characterized in that, The device also includes a liquid crystal panel (2), a bus board (3) and a bracket board (7), the liquid crystal panel (2) and the bus board (3) being respectively mounted on both sides of the bracket board (7), and the bracket board (7) being mounted on the housing (9).

9. The connection structure for an online power quality monitoring device according to claim 8, characterized in that, The LCD panel (2) includes indicator lights, buttons, and an LCD module made of color LCD screen.

10. The connection structure for an online power quality monitoring device according to claim 1, characterized in that, The device also includes a rear cover plate (10) mounted on the housing (9).

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