Implementation method of split type measurement and control terminal for low-voltage switchgear assembly

Abstract

The invention discloses a split type measurement and control terminal for low-voltage switchgear assembly, which comprises a display terminal arranged in a drawer unit and a plurality of input and output devices respectively arranged in each drawer unit, each input and output device communicates through an RS485, and the display terminal is electrically connected with one input and output device through a 485 bus. A plurality of input and output devices in a drawer unit are connected through a display terminal, corresponding parameters of components in the drawer unit are collected through the input and output devices, signal communication is carried out between the input and output devices through RS485, and the MODBUS-RTU protocol is executed by adopting a'hand-in-hand 'hardware connection mode. With the adoption of the mode, the low-voltage power distribution cabinet with the plurality of drawer units only needs one display terminal, so that the number of wires in the drawer units can be effectively reduced, and the data acquisition precision and the working reliability and maintenance convenience of the drawer units are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage complete switchgear applications, and particularly to a split-type measurement and control terminal for low-voltage complete switchgear. Background Art

[0002] The drawer unit of low-voltage complete switchgear is a functional module in a low-voltage distribution cabinet, designed to achieve specific power supply tasks. Low-voltage distribution cabinets are widely used in various industrial automation sites, commercial buildings, residential buildings, public facilities, etc. Drawer units perform different functions in various application scenarios. As an independent functional module, the drawer unit is used to control various scenarios such as motors, frequency converters, feed circuits, and motor circuits. Drawer units have a wide range of applications and a large number of applications. Optimizing the function of each drawer unit or reducing the cost of the drawer unit can bring very considerable benefits. The internal components of the drawer unit of low-voltage complete switchgear are rich in variety, and the specific configuration varies according to application scenarios and functional requirements. Common components inside the drawer unit include: circuit breakers, disconnectors, contactors, thermal relays, current transformers, secondary control components, intelligent monitoring devices, etc. The intelligent monitoring device cooperates with current transformers and other components to comprehensively and real-time monitor the operating status of the low-voltage distribution cabinet, providing efficient and convenient management means for maintenance personnel.

[0003] However, since the current display terminal directly collects the corresponding parameters of the internal components of the drawer unit, one drawer unit corresponds to one display terminal, the number of wires inside the drawer unit is large and chaotic, the data acquisition accuracy is low, and the working reliability and maintenance convenience of the drawer unit are poor. Summary of the Invention

[0004] The purpose of this application is to provide a split-type measurement and control terminal for low-voltage complete switchgear to solve the problems of a large and chaotic number of wires inside the existing drawer unit, low data acquisition accuracy, and poor working reliability and maintenance convenience of the drawer unit.

[0005] To solve the above technical problems, this application provides a split-type measurement and control terminal for low-voltage complete switchgear, including:

[0006] A display terminal arranged in one drawer unit and multiple input / output devices separately arranged in each drawer unit, each of the input / output devices communicates through RS485, and the display terminal is electrically connected to one of the input / output devices through a 485 bus;

[0007] The display terminal is integrated with an LED liquid crystal screen and a plurality of instrument buttons. An indicator light and a switch-on / off button electrically connected to the display terminal are arranged on the panel of the drawer unit. The input / output device is integrated with a microprocessor and a switch device on / off control module, an analog quantity data acquisition module, an RS485 external interface, a copper bar temperature detection module, and a drawer unit number setting module that are communicatively connected to the microprocessor.

[0008] As a preferred embodiment, for a split-type measurement and control terminal for low-voltage complete switchgear, there are 4 instrument buttons, namely an enter button, a SET button, a left button, and a right button.

[0009] As a preferred embodiment, for a split-type measurement and control terminal for low-voltage complete switchgear, the MODBUS-RTU communication protocol is adopted between the display terminal and the input / output device.

[0010] As a preferred embodiment, for a split-type measurement and control terminal for low-voltage complete switchgear, the indicator lights include a switch-off indicator light, a switch-on indicator light, and an operation indicator light.

[0011] As a preferred embodiment, for a split-type measurement and control terminal for low-voltage complete switchgear, the switch device on / off control module includes an input control module and an output control module. The input control module is used to control the state of a circuit breaker or a contactor, the input of an alarm signal from a sensor, and the remote / local control switching. The output control module is used to control the switch-on / off command of a circuit breaker or a contactor, the alarm output of a fault abnormality, and the fan output.

[0012] It should be detailed in the solution that, for a split-type measurement and control terminal for low-voltage complete switchgear, the analog quantity data acquisition module is a current transformer, which is used to collect the current value on the primary side of the drawer unit and transmit the current value to the microprocessor.

[0013] It should be further detailed in the solution that, for a split-type measurement and control terminal for low-voltage complete switchgear, the drawer unit number setting module is a single-pole double-throw toggle switch, and the single-pole double-throw toggle switch is used to configure numbers for each drawer unit through the microprocessor.

[0014] Compared with the prior art, a split-type measurement and control terminal for low-voltage complete switchgear provided by the present invention includes a display terminal disposed in one drawer unit and a plurality of input / output devices separately arranged in each drawer unit. Each input / output device communicates through RS485. The display terminal is electrically connected to one of the input / output devices through a 485 bus. An LED liquid crystal screen and a plurality of instrument buttons are integrated on the display terminal. An indicator light and a closing and opening button electrically connected to the display terminal are arranged on the panel of the drawer unit. A microprocessor, a switch device closing and opening control module, an analog quantity data acquisition module, an RS485 external interface, a busbar temperature detection module, and a drawer unit number setting module are integrated on the input / output device. By connecting a plurality of input / output devices in the drawer unit through one display terminal, and collecting corresponding parameters of internal components in the drawer unit through the input / output device, signal communication is carried out between the input / output devices through RS485, and a "hand in hand" hardware connection method is adopted to execute the MODBUS-RTU protocol. By adopting this method, a low-voltage power distribution cabinet containing multiple drawer units only needs to use one display terminal, which can effectively reduce the wiring quantity in the drawer unit, improve the data acquisition accuracy, the working reliability, and the maintenance convenience of the drawer unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0016] Figure 1 FIG. is a hardware framework diagram of a split-type measurement and control terminal for low-voltage complete switchgear provided by an embodiment of the present application;

[0017] Figure 2 FIG. is a connection schematic diagram of a display terminal and a plurality of input / output devices provided by an embodiment of the present application;

[0018] In the figure: 1. Display terminal; 2. Input / output device; 3. 485 bus; 4. LED liquid crystal screen; 5. Instrument button; 6. Indicator light; 7. Closing and opening button; 8. Microprocessor; 9. Switch device closing and opening control module; 10. Analog quantity data acquisition module; 11. RS485 external interface; 12. Busbar temperature detection module; 13. Drawer unit number setting module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings.

[0020] The core of this application is to provide a split-type measurement and control terminal for low-voltage complete switchgear, which solves the problems of a large number and chaos of wire connections in the existing drawer unit, low data acquisition accuracy, and poor working reliability and maintenance convenience of the drawer unit.

[0021] Figure 1 It is a hardware framework diagram of a split-type measurement and control terminal for low-voltage complete switchgear provided by an embodiment of this application; Figure 2 It is a schematic diagram of the connection between a display terminal and multiple input / output devices provided by an embodiment of this application, as Figures 1 to 2 shown.

[0022] Embodiment 1

[0023] A split-type measurement and control terminal for low-voltage complete switchgear includes a display terminal 1 and multiple input / output devices 2. The display terminal 1 is arranged in any one drawer unit, and each input / output device 2 is separately arranged in each drawer unit. The adjacent two input / output devices 2 communicate with each other through RS485. The display terminal 1 is electrically connected to one of the input / output devices 2 through a 485 bus 3. Preferably, for a split-type measurement and control terminal for low-voltage complete switchgear, the MODBUS-RTU communication protocol is adopted between the display terminal 1 and the input / output device 2. The power supply of the display terminal 1 is provided by the input / output device 2, and the supply voltage is low-voltage direct current.

[0024] An LED liquid crystal screen 4 and multiple instrument buttons 5 are integrated on the display terminal 1. An indicator light 6 and a closing and opening button 7 electrically connected to the display terminal 1 are arranged on the panel of the drawer unit. The display terminal 1 displays the collected information on the LED liquid crystal screen 4. Preferably, for a split-type measurement and control terminal for low-voltage complete switchgear, the indicator light 6 includes a tripping indicator light, a closing indicator light, and an operating indicator light. The tripping indicator light, the closing indicator light, and the operating indicator light are used as the status indicators of the drawer unit working, and are used to quickly display the operating status, fault information, or activation situation of specific functions of the equipment. The tripping indicator light is green, the closing indicator light is red, and the operating indicator light is green. The indicator light 6 is controlled by a MOS tube driven by a controller integrated in the display terminal 1, and the controller judges the current working state of the indicator light 6. The indicator light 6 uses an indicator light with a larger diameter, such as 22 mm. The indicator light 6 is installed on the front of the drawer unit and is connected to the display terminal 1 through wires and terminals.

[0025] Preferably, a split-type measurement and control terminal for low-voltage complete switchgear has 4 instrument buttons 5, namely an enter button, a SET button, a left button, and a right button. The page turning or setting of other functions of the display terminal 1 is realized through the instrument buttons 5. Different display parameters can be switched through the instrument buttons 5, such as voltage parameters, current parameters, and power parameters. Meanwhile, in the application scenario where a single display terminal 1 is used in multiple drawer units, the drawer unit number can be switched through the instrument buttons 5 to display the power parameters of different drawer units.

[0026] The opening and closing button 7 is used to manually control the opening and closing operations of the circuit breaker or other switchgear. The opening and closing button 7 controls the lighting and extinguishing of the indicator light 6.

[0027] The opening and closing button 7 uses a button with a relatively large diameter, such as 22 mm. The opening and closing button 7 is installed on the front of the drawer unit and is connected to the display terminal 1 through wires and terminals. The drive circuit of the display terminal 1 is designed with an optocoupler and a triode drive, which can well isolate external electromagnetic interference.

[0028] The input and output device 2 is integrated with a microprocessor 8 and a switch device opening and closing control module 9, an analog data acquisition module 10, an RS485 external interface 11, a copper bar temperature detection module 12, and a drawer unit number setting module 13 that are communicatively connected to the microprocessor 8. The input and output device 2 collects the current and voltage values on the primary side of the drawer unit. The copper bar of the drawer unit passes through the current sampling coil, and the winding head of the current sampling coil is directly welded to the circuit board of the output line of the input and output device 2. The sampled current value is converted into a voltage value through the sampling circuit on the circuit board and sent to the microprocessor 8 of the input and output device 2. The voltage sampling terminal is at the top of the input and output device 2 and is connected to the lower port of the circuit breaker through a wire. At the same time, the voltage sampling terminal also provides power for the entire input and output device 2, saving the wiring of the power supply.

[0029] The switch device opening and closing control module 9 is used to monitor the device status or provide control instructions to realize the automatic control function of the low-voltage distribution worker drawer unit. There are 7 inputs and 5 outputs integrated on the input and output device 2. Preferably, for a split-type measurement and control terminal for low-voltage complete switchgear, the switch device opening and closing control module 9 includes an input control module and an output control module. The input control module is used to control the status of the circuit breaker or contactor, the input of the alarm signal of the sensor, and the remote / local control switching. The output control module is used to control the opening and closing instructions of the circuit breaker or contactor, the alarm output of the fault abnormality, and the fan output.

[0030] Preferably, a split-type measurement and control terminal for low-voltage complete switchgear. The analog data acquisition module 10 is a current transformer, which is used to collect the current value on the primary side of the drawer unit and transmit the current value to the microprocessor 8, reducing external signal interference. Moreover, the lead wire from the current transformer to the pins of the microprocessor 8 is very short, effectively improving the accuracy of current sampling, and further improving the sampling accuracy of all power parameters of the drawer unit. The current transformer ratio is designed as 100A / 10ma and is fixed on the input and output device 2 by potting to prevent problems such as device failures or inaccurate data collection in the drawer unit caused by the shaking of the current transformer. The input and output device 2 collects voltage analog signals in the following way: the device is connected to the breaker connection port with a wire, and when the screw of the breaker connection port fixes the copper bar, the voltage acquisition signal wire can be fixed together. The input and output device 2 is powered by the voltage analog sampling line. When the breaker is in the off state, the input and output device 2 is in a power-off state, and maintenance personnel can intuitively find the abnormal power-on of the drawer unit.

[0031] The main function of the RS485 external interface 11 is for communication between the drawer unit and external devices. It can send the power data of the drawer unit to the low-voltage power distribution cabinet or the cloud in the power distribution room through the modbus-RTU protocol to achieve unified data management.

[0032] The copper bar temperature detection module 12 is used to monitor the temperature of the copper bar in the drawer unit in real time and perform some protection actions when the temperature exceeds the threshold. The copper bar temperature detection module 12 collects the copper bar temperature in real time. When it monitors that the temperature exceeds 30% of the set threshold, it issues an alarm instruction, and the alarm situation can be displayed through the alarm indicator light of the drawer unit; when it monitors that the temperature exceeds 60% of the set threshold, the microprocessor 8 controls the miniature circuit breaker of the drawer unit to disconnect.

[0033] Preferably, a split-type measurement and control terminal for low-voltage complete switchgear. The drawer unit number setting module 13 is a single-pole double-throw toggle switch, which is used to configure numbers for each drawer unit through the microprocessor 8. The drawer unit number setting module 13 refers to configuring the numbers of the drawer units through the microprocessor 8 in the input and output device. The pins of the microprocessor 8 are configured as high level or low level by connecting to the single-pole double-throw toggle switch. Therefore, each pin of the microprocessor 8 has two level selection options of "0" and "1". 16 numbers can be configured with the pins of 4 microprocessors 8, such as "0000, 0001... 1111", which can solve the problem of number differentiation for different drawer units on a low-voltage power distribution cabinet.

[0034] Each input / output device 2 has three communication interfaces, and the functions of the three communication interfaces are as follows: The first interface is the external 485 interface of the drawer unit, which is used for debugging or connecting other 485 devices; the second 485 interface can be directly connected to the display terminal 1, and the third 485 interface can be used to connect to the second 485 interface of the input / output devices 2 of other drawer units in the low-voltage switchgear cabinet. The input / output devices 2 can be connected together in a "daisy chain" manner and then connected to the display terminal 1. The numbering of the drawer units is achieved through a single-pole double-throw toggle switch.

[0035] A split-type measurement and control terminal for low-voltage switchgear provided by the present invention includes a display terminal 1 arranged in a drawer unit and a plurality of input / output devices 2 respectively arranged in each drawer unit. Each input / output device 2 communicates through RS485, and the display terminal 1 is electrically connected to one of the input / output devices 2 through a 485 bus 3; an LED liquid crystal screen 4 and a plurality of instrument buttons 5 are integrated on the display terminal 1, an indicator light 6 and a closing and opening button 7 electrically connected to the display terminal 1 are arranged on the panel of the drawer unit, and a microprocessor 8 and a switch device opening and closing control module 9, an analog quantity data acquisition module 10, an RS485 external interface 11, a copper bar temperature detection module 12, and a drawer unit number setting module 13 that are communicatively connected to the microprocessor 8 are integrated on the input / output device 2. By connecting a plurality of input / output devices 2 in the drawer unit through one display terminal 1, and collecting the corresponding parameters of the internal components of the drawer unit through the input / output device 2, the input / output devices 2 communicate with each other through RS485, and adopt a "daisy chain" hardware connection method to execute the MODBUS-RTU protocol. By adopting this method, a low-voltage switchgear cabinet containing multiple drawer units only needs to use one display terminal 1, which can effectively reduce the wiring quantity in the drawer unit, improve the data acquisition accuracy, the working reliability, and the maintenance convenience of the drawer unit.

[0036] Those skilled in the art will readily think of other embodiments of the present application after considering the specification and the practice of the application disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field disclosed by the present application. The specification and the embodiments are only regarded as exemplary, and the true scope of the present application is pointed out by the claims.

[0037] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The embodiments of the present application described above do not constitute a limitation on the protection scope of the present application.

Claims

1. A split-type measurement and control terminal for low-voltage complete switchgear, characterized in that: include: A display terminal (1) arranged in a drawer unit and a plurality of input / output devices (2) arranged in each drawer unit, each of the input / output devices (2) communicating via RS485, and the display terminal (1) being electrically connected to one of the input / output devices (2) via a 485 bus (3); The display terminal (1) is integrated with an LED liquid crystal screen (4) and a plurality of instrument buttons (5); an indicator light (6) and an opening and closing button (7) electrically connected to the display terminal (1) are provided on the panel of the drawer unit; the input and output device (2) is integrated with a microprocessor (8) and a switch opening and closing control module (9) communicatively connected to the microprocessor (8), an analog data acquisition module (10), an RS485 external interface (11), a copper busbar temperature detection module (12), and a drawer unit number setting module (13).

2. The split-type measurement and control terminal for low-voltage complete switchgear according to claim 1 is characterized in that: The instrument buttons (5) are four in number, namely an enter button, a SET button, a left button and a right button.

3. The split-type measurement and control terminal for low-voltage complete switchgear according to claim 1 is characterized in that: The display terminal (1) and the input / output device (2) use a MODBUS-RTU communication protocol.

4. The split-type measurement and control terminal for low-voltage complete switchgear according to claim 1 is characterized in that: The indicator lights (6) include an opening indicator light, a closing indicator light and an operation indicator light.

5. The split-type measurement and control terminal for low-voltage complete switchgear according to claim 1 is characterized in that: The switch device opening and closing control module (9) comprises an input control module and an output control module, wherein the input control module is used to control the state of a circuit breaker or a contactor, the alarm signal input of a sensor, and remote / local control switching, and the output control module is used to control the opening and closing instructions of the circuit breaker or the contactor, the alarm output of an abnormal fault, and the output of a fan.

6. The split-type measurement and control terminal for low-voltage complete switchgear according to claim 1 is characterized in that: The analog data acquisition module (10) is a current transformer, which is used to collect the current value of the primary side of the drawer unit and transmit the current value to the microprocessor (8).

7. The split-type measurement and control terminal for low-voltage complete switchgear according to claim 1 is characterized in that: The drawer unit number setting module (13) is a single-pole double-throw toggle switch, and the single-pole double-throw toggle switch is used to configure a number for each drawer unit through the microprocessor (8).

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