Auxiliary contact expansion device for distribution network ring main cabinet

Abstract

The present invention discloses an auxiliary contact expansion device for a distribution network ring main unit, comprising a circuit board, an isolation and voltage reduction module welded to the top of the circuit board, a field-effect transistor mounted on one end of the isolation and voltage reduction module through a mounting hole, a high-voltage and high-current relay mounted on one end and one side of the field-effect transistor via screws, an IO multiplexing chip welded to one end of the high-voltage and high-current relay via metal pins, a voltage comparator mounted on one end of the IO multiplexing chip via screws, and an ESP32S2 single-chip microcomputer mounted on one end of the top of the circuit board, located on one side of the voltage comparator, via screws. This device eliminates the need for debuggers to search for a power source on site and use cables for connection, greatly reduces operational safety risks associated with connecting to on-site power points, saves debuggers a significant amount of time, and thus improves their debugging efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to an auxiliary contact expansion device for a distribution network ring main cabinet. Background Art

[0002] When debugging automated switches, commissioning personnel often need to expand the input signal based on a single input, allowing them to verify the device's functionality. Due to factors such as equipment procurement, different devices may have different input signals. This means commissioning personnel must select relays triggered by different voltages to expand the input signal based on the on-site equipment. Multiple relay groups are required to create multiple auxiliary contacts, requiring considerable time to build and configure.

[0003] The existing auxiliary contact expansion device of the distribution network ring network cabinet has the following disadvantages: multiple groups of relays need to be combined with each other to expand multiple auxiliary contacts, and during the construction process, it is necessary to find a power supply on site. The temporary circuit cannot well guarantee the electrical safety of the debugging personnel, and therefore often leads to misoperation of the auxiliary contacts and electric shock. Summary of the Invention

[0004] The main purpose of the present invention is to provide an auxiliary contact expansion device for a distribution network ring main cabinet, which can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The auxiliary contact expansion device of the distribution network ring network cabinet includes a circuit board, an isolation step-down module is welded on the top of the circuit board, and a field effect tube is installed on one end of the isolation step-down module through a mounting hole, a high-voltage and high-current relay is installed between the field effect tube and the varistor by screws, wherein one end of the high-voltage and high-current relay close to the side of the isolation step-down module is welded with an IO multiplexing chip by a metal pin, and a voltage comparator is installed on one end of the IO multiplexing chip by screws, and an ESP32S2 single-chip computer is installed on one end of the top of the circuit board and on one side of the voltage comparator by screws. The method of using the auxiliary contact expansion device of the distribution network ring network cabinet is as follows: a lithium battery is connected to the circuit board to ensure applicability in an environment without power supply. It can also be connected to an external 12V power adapter for use. After 12V is connected, the isolation step-down module reduces it to 3.3V to provide power for internal components. The input interface can be connected to the ring network cabinet opening and closing contact line that needs to be expanded. When the opening and closing contact signal of the ring network cabinet is sent to this device, the voltage signal will be rectified by the rectifier bridge. After rectification, it will be reduced to an appropriate voltage through a voltage divider resistor, and then compared with the reference voltage of the trigger threshold by a voltage comparator. The output end of the voltage comparator is connected to the ESP32S2 microcontroller. The ESP32S2 microcontroller will perform real-time IO detection on the voltage comparator. When there is a trigger signal, it will control the IO multiplexing chip to give the field effect tube control signal, and the field effect tube will then drive the relay to close or disconnect.

[0007] Furthermore, varistors are installed at equal distances on one side of the top of the circuit board by screws and an isolation output interface is welded on one side of the varistor. Varistors are placed on the lines of the input interface and the isolation output interface to prevent surge interference.

[0008] Furthermore, positioning holes are provided at the corners of the circuit board.

[0009] Furthermore, there are four groups of isolated output interfaces, one end of which is equipped with an input interface via a screw, and the input interface can be connected to the opening and closing contact line of the ring network cabinet that needs to be expanded. When the opening and closing contact signal of the ring network cabinet is sent to this device, the voltage signal will be rectified through the rectifier bridge.

[0010] Furthermore, varistor is placed on the lines of the input interface and the isolated output interface to prevent interference from surge.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The equipment of this project innovatively integrates an integrated wide-voltage identification device. Compared with the use of general relays, the device of this project is compatible with input voltage signals in various scenarios, so that commissioning personnel do not need to carry a large number of relays with different control voltages to the site to expand the auxiliary contacts.

[0013] 2. Compared with conventional relay modules, the device in this project integrates multiple normally open and normally closed passive output signals and provides a large number of auxiliary contacts, which helps debuggers avoid spending a lot of time on relay circuit construction.

[0014] 3. Compared with the conventional auxiliary contact expansion solution, the device in this project has a built-in power supply battery and power supply circuit for use in the device, which avoids the need for debuggers to find a power source on site and use cables for connection. It greatly protects the operational safety risks caused by debuggers connecting to on-site power points, and saves debuggers a lot of time, thereby improving the debugging efficiency of debuggers. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the auxiliary contact expansion device of the distribution network ring main cabinet of the present invention.

[0016] Figure 2 This is a schematic diagram of the varistor structure of the auxiliary contact expansion device of the distribution network ring main cabinet of the present invention.

[0017] Figure 3 It is a side view of the auxiliary contact expansion device of the distribution network ring main unit of the present invention.

[0018] In the figure: 1. IO multiplexing chip; 2. Varistor; 3. Input interface; 4. Isolation output interface; 5. High-voltage and high-current relay; 6. Field-effect transistor; 7. Circuit board; 8. Isolation step-down module; 9. ESP32S2 microcontroller; 10. Voltage comparator. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] like Figure 1-3As shown, the auxiliary contact expansion device of the distribution network ring network cabinet includes a circuit board 7, an isolation step-down module 8 is welded on the top of the circuit board 7, and a field effect tube 6 is installed on one end of the isolation step-down module 8 through a mounting hole, and a high-voltage and high-current relay 5 is installed between the field effect tube 6 and the varistor 2 by screws, wherein one end of the high-voltage and high-current relay 5 close to the side of the isolation step-down module 8 is welded with an IO multiplexing chip 1 by a metal pin, and one end of the IO multiplexing chip 1 is installed with a voltage comparator 10 by screws, and an ESP32S2 single-chip computer 9 is installed on one end of the top of the circuit board 7 and on one side of the voltage comparator 10 by screws. The method of using the auxiliary contact expansion device of the distribution network ring network cabinet is as follows: a lithium battery is connected to the circuit board 7 to ensure that there is no power supply ring It has the applicability in various environments and can also be connected to an external 12V power adapter for use. After 12V is connected, the isolation step-down module 8 reduces it to 3.3V to provide power for internal components. The input interface 3 can be connected to the ring network cabinet opening and closing contact line that needs to be expanded. When the opening and closing contact signal of the ring network cabinet is sent to this device, the voltage signal will be rectified by the rectifier bridge. After rectification, it will be reduced to a suitable voltage through a voltage divider resistor, and then compared with the reference voltage of the trigger threshold by the voltage comparator 10. The output end of the voltage comparator 10 is connected to the ESP32S2 microcontroller 9. The ESP32S2 microcontroller 9 will perform real-time IO detection on the voltage comparator 10. When there is a trigger signal, it will control the IO multiplexing chip 1 to give the field effect tube 6 a control signal, and the field effect tube 6 will then drive the relay to be attracted or disconnected.

[0021] Among them, varistors 2 are installed at equal distances on one side of the top of the circuit board 7 by screws, and an isolation output interface 4 is welded on one side of the varistor 2.

[0022] In this embodiment, Figure 1 As shown, varistor 2 is placed on the lines of the input interface 3 and the isolated output interface 4 to prevent surge interference.

[0023] Positioning holes are provided at the corners of the circuit board 7 .

[0024] In this embodiment, Figure 1 As shown, the positioning holes at the corners of the circuit board 7 are used to achieve the effect of installation and fixing.

[0025] Specifically, four groups of the isolation outlet interfaces 4 are provided, and one end of the isolation outlet interface 4 is mounted with an input interface 3 via screws.

[0026] In this embodiment, Figure 1 As shown, the input interface 3 can be connected to the opening and closing contact line of the ring main unit that needs to be expanded. When the opening and closing contact signal of the ring main unit is sent to this device, the voltage signal will be rectified through the rectifier bridge.

[0027] Wherein, varistor 2 is placed on the lines of the input interface 3 and the isolated output interface 4 to prevent interference from surge.

[0028] In this embodiment, Figure 1 As shown, it plays the role of stabilizing voltage and current, and the effect is significant.

[0029] It should be noted that the present invention is an auxiliary contact expansion device for a distribution network ring network cabinet. When working, a lithium battery is connected to the circuit board 7 to ensure applicability in an environment without power supply. At the same time, it can also be connected to an external 12V power adapter for use. After the 12V is connected, the isolation step-down module 8 is reduced to 3.3V to provide power for internal components. The input interface 3 can be connected to the ring network cabinet opening and closing contact line that needs to be expanded. When the opening and closing contact signal of the ring network cabinet is sent to this device, the voltage signal will be rectified by the rectifier bridge. After rectification, it will be reduced to a suitable voltage through a voltage divider resistor, and then compared with the reference voltage of the trigger threshold by the voltage comparator 10. The output end of the voltage comparator 10 is connected to the ESP32S2 single-chip microcomputer 9. The ESP32S2 single-chip microcomputer 9 will perform real-time IO detection on the voltage comparator 10. When there is a trigger signal, it will control the IO multiplexing chip 1 to give the field effect tube 6 a control signal, and the field effect tube 6 will then drive the relay to be attracted or disconnected. The line of the input interface 3 and the isolation output interface 4 Two varistors are placed on the road to prevent surge interference. The equipment of this project innovatively integrates an integrated wide voltage identification device. Compared with the use of general relays, the device of this project is compatible with the input voltage signals in various scenarios, so that the debugging personnel do not need to carry a large number of relays with different control voltages to the site to expand the auxiliary contacts. Compared with conventional relay modules, the device of this project integrates the expansion of multiple normally open and normally closed passive output signals, and provides a large number of auxiliary contact expansions, which helps debuggers avoid spending a lot of time on relay circuit construction. Compared with the conventional use of auxiliary contact expansion solutions, the device of this project has built-in power supply batteries and power supply circuits for the device to use, avoiding the need for debuggers to find power on site and use cables for connection, greatly protecting the operational safety risks brought by the debuggers connecting to the on-site power points, and saving the debuggers a lot of time, thereby improving the debugging efficiency of the debuggers.

[0030] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A distribution network ring main cabinet auxiliary contact expansion device, comprising a circuit board (7) and a varistor (2), characterized in that: The top of the circuit board (7) is welded with an isolation step-down module (8), and one end of the isolation step-down module (8) is mounted with a field effect tube (6) through a mounting hole, one end of the field effect tube (6) is mounted with a high-voltage and high-current relay (5) through a screw, and a high-voltage and high-current relay (5) is mounted between the field effect tube (6) and the varistor (2) through a screw, wherein one end of the high-voltage and high-current relay (5) close to the side of the isolation step-down module (8) is welded with an IO multiplexing chip (1) through a metal pin, and one end of the IO multiplexing chip (1) is mounted with a voltage comparator (10) through a screw, and an ESP32S2 single-chip computer (9) is mounted on one end of the top of the circuit board (7) and on one side of the voltage comparator (10) through a screw, and the method of using the auxiliary contact expansion device of the distribution network ring network cabinet is as follows: connect a lithium battery to the circuit board (7) The device is connected to an external 12V power adapter to ensure applicability in an environment without power supply. At the same time, the device can also be used by connecting to an external 12V power adapter. After the 12V is connected, the isolation step-down module (8) reduces the voltage to 3.3V to provide power to the internal components. The input interface (3) can be connected to the ring network cabinet opening and closing contact line that needs to be expanded. When the opening and closing contact signal of the ring network cabinet is sent to the device, the voltage signal will be rectified by the rectifier bridge. After rectification, it will be reduced to a suitable voltage by the voltage divider resistor. It will then be compared with the reference voltage of the trigger threshold by the voltage comparator (10). The output end of the voltage comparator (10) is connected to the ESP32S2 single-chip computer (9). The ESP32S2 single-chip computer (9) will perform real-time IO detection on the voltage comparator (10). When there is a trigger signal, it will control the IO multiplexing chip (1) to give the field effect tube (6) a control signal, and the field effect tube (6) will then drive the relay to be closed or disconnected.

2. The auxiliary contact expansion device for a distribution network ring main unit according to claim 1, characterized in that: Varistors (2) are mounted at equal distances on one side of the top of the circuit board (7) via screws, and an isolation output interface (4) is welded to one side of the varistor (2).

3. The auxiliary contact expansion device for a distribution network ring main unit according to claim 1, characterized in that: Positioning holes are provided at the corners of the circuit board (7).

4. The auxiliary contact expansion device for a distribution network ring main unit according to claim 2, characterized in that: The isolation outlet interface (4) is specifically provided with four groups, and one end of the isolation outlet interface (4) is mounted with an input interface (3) via a screw.

5. The auxiliary contact expansion device for a distribution network ring main unit according to claim 1, characterized in that: Varistors (2) are placed on the lines of the input interface (3) and the isolated output interface (4) to prevent interference from surges.

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