On-site digitizing device for high-voltage circuit breaker

Abstract

The invention discloses an on-site digitization device for a high-voltage circuit breaker, and relates to the field of high-voltage circuit breakers. The device comprises a main control circuit board, an external acquisition wiring terminal and an external expansion wiring terminal, the external acquisition wiring terminal is connected with the outer wall of the high-voltage circuit breaker, and the external acquisition wiring terminal acquires various types of monitoring signals in the high-voltage circuit breaker body through wiring in the high-voltage circuit breaker; and the main control circuit board uniformly converts various types of monitoring signals into digital quantity monitoring signals, sends the digital quantity monitoring signals to the outside through the external expansion wiring terminal, and receives a control command issued by the outside. According to the invention, on-site digitalization can be carried out, and an electrical control circuit is simplified.

Description

Technical Field

[0001] The present application relates to the field of high-voltage circuit breakers, and in particular to an on-site digitization device for high-voltage circuit breakers. Background Art

[0002] High-voltage circuit breakers are one of the core components of power distribution networks, with widespread and extensive applications, playing a vital role. With the construction of new power systems and the deepening application of smart grids, distribution networks not only shoulder the traditional task of receiving and distributing electricity from the main grid, but also, with the widespread application of distributed renewable energy, also take on the role of accessing distributed energy and aggregating electricity to the main grid. This shows that the distribution network plays an even more important role in the new power system. Therefore, both the power grid and end users have put forward specific requirements for the digitalization and automation of power distribution. In particular, high-voltage circuit breakers, as core components, have been put forward with specific requirements for comprehensive perception, local digitalization, and automation.

[0003] Traditional high-voltage circuit breakers are mostly composed of three major components: an operating mechanism, a pole, and electrical controls. These breakers lack the ability to sense and communicate critical information. In recent years, to enhance the intelligence of power distribution systems, end users have added electrical contact temperature sensors and Hall sensors to the exterior of traditional high-voltage circuit breakers to monitor contact temperature, the current in the opening and closing coils, and the current in the energy storage motor. Others have added angular displacement sensors to measure the opening and closing speeds of high-voltage circuit breakers, and integrated electronic current transformers and voltage transformers into the poles to measure line current and voltage. These later, "patchwork" integrated designs have resulted in increasingly complex electrical control circuits for high-voltage circuit breakers, as well as inconsistent monitoring information types. This has caused significant production and maintenance challenges for both manufacturers and users, posing significant risks. Summary of the Invention

[0004] The purpose of this application is to provide an on-site digitization device for a high-voltage circuit breaker, which can perform digitization on-site and simplify electrical control circuits.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] The present application provides an on-site digitization device for a high-voltage circuit breaker, comprising: a main control circuit board, an external acquisition terminal and an external expansion terminal; the external acquisition terminal is connected to the outer wall of the high-voltage circuit breaker, and the external acquisition terminal is used to collect various types of monitoring signals in the high-voltage circuit breaker body through the internal wiring of the high-voltage circuit breaker; the main control circuit board is used to uniformly convert the various types of monitoring signals into digital monitoring signals, send the digital monitoring signals to the outside through the external expansion terminal, and receive control commands issued from the outside.

[0007] According to the specific embodiments provided in this application, this application has the following technical effects:

[0008] The present application provides an on-site digitization device for a high-voltage circuit breaker. The external acquisition terminal is connected to the outer wall of the high-voltage circuit breaker. Various types of monitoring signals in the high-voltage circuit breaker body can be acquired only through the internal wiring of the high-voltage circuit breaker, greatly reducing the number of acquisition wirings. At the same time, the main control circuit board exchanges information with the outside through the external expansion terminal with very few electrical control circuits, further streamlining the electrical control circuits. The main control circuit board uniformly converts various types of monitoring signals into digital monitoring signals, thereby realizing on-site digitization of the high-voltage circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0010] Figure 1 A schematic structural diagram of an on-site digitization device for a high-voltage circuit breaker provided in this application;

[0011] Figure 2 Functional block diagram of the main control circuit board provided for this application;

[0012] Figure 3 Schematic diagram of the A / B / C phase current and zero-sequence current measurement circuit, and the A / B / C phase voltage and zero-sequence voltage measurement circuit provided in this application;

[0013] Figure 4 Schematic diagram of the closing current measurement circuit, opening current measurement circuit and energy storage current measurement circuit provided in this application;

[0014] Figure 5 Schematic diagram of the angular displacement measurement circuit provided for this application;

[0015] Figure 6 Schematic diagram of the energy storage, closing and opening control circuits provided for this application;

[0016] Figure 7 Schematic diagram of the monitoring circuit for energy storage status, closing status, opening status, working position status, test position status, closing command, opening command, and energy storage command provided for this application;

[0017] Figure 8 Schematic diagram of the communication circuit provided for this application.

[0018] Figure markings: shock-absorbing bracket-1, mounting stud-2, sealing shell-3, status indicator light-4, main control circuit board-5, external expansion terminal-6, external acquisition terminal-7, buffer pad-8. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] In an exemplary embodiment, Figure 1 As shown, the present application provides an on-site digitization device for a high-voltage circuit breaker, comprising: a main control circuit board 5, an external data acquisition terminal 7, and an external expansion terminal 6. The external data acquisition terminal 7 is connected to the outer wall of the high-voltage circuit breaker and is used to collect various types of monitoring signals from the high-voltage circuit breaker through the internal wiring of the high-voltage circuit breaker. The main control circuit board 5 is used to uniformly convert various types of monitoring signals into digital monitoring signals, transmit the digital monitoring signals to the outside through the external expansion terminal 6, and receive control commands issued by the outside.

[0022] This application collects various electrical and non-electrical quantities preset inside the high-voltage circuit breaker, and digitizes them on-site through edge computing conversion. It interacts with high-voltage complete equipment or distribution network systems through very few electrical control line interfaces, thereby improving the intelligence level of high-voltage circuit breakers on the basis of streamlining electrical control lines, and providing high-voltage circuit breaker manufacturers and users with the benefits of fast wiring and maintenance-free operation.

[0023] As an optional implementation, Figure 1 The local digitization device for a high-voltage circuit breaker further includes a sealed housing 3 and a status indicator light 4. A main control circuit board 5 is disposed within the sealed housing 3; external data acquisition terminals 7 and the status indicator light 4 are both disposed on the sealed housing 3; and external expansion terminals 6 extend through the sealed housing 3 and connect to the main control circuit board 5. The control terminal of the status indicator light 4 is connected to the signal output terminal of the main control circuit board 5.

[0024] As an optional embodiment, the on-site digitization device for a high-voltage circuit breaker further includes: a shock-absorbing bracket 1, a plurality of buffer pads 8, and a plurality of mounting studs 2. The plurality of buffer pads 8 are disposed between the shock-absorbing bracket 1 and the sealed housing 3; the plurality of mounting studs 2 are disposed on the shock-absorbing bracket 1; the plurality of mounting studs 2 are matched one-to-one with a plurality of mounting holes disposed on the outside of the sealed housing 3 and are fastened together by bolts.

[0025] Figure 1 In the illustrated on-site digitization device for high-voltage circuit breakers, the shock-absorbing bracket 1 is equipped with four cushions 8 and three reserved mounting studs 2. These studs 2 correspond one-to-one with three mounting holes on the outside of the sealed housing 3 and are secured with bolts. The cushions 8 reduce the mechanical impact during the closing and opening of the circuit breaker. The external data collection terminals 7 and external expansion terminals 6 are located at the bottom of the sealed housing 3.

[0026] As an optional implementation, Figure 2 As shown, the main control circuit board 5 includes: a CT1 acquisition module, a CT2 acquisition module, a PT acquisition module, a temperature acquisition module, a pulse signal acquisition module, a switch value acquisition module, an optocoupler isolation module, a communication module, and an MCU main control module. The CT1 acquisition module, CT2 acquisition module, PT acquisition module, temperature acquisition module, pulse signal acquisition module, switch value acquisition module, optocoupler isolation module, and communication module are all connected to the MCU main control module.

[0027] The CT1 acquisition module includes four current acquisition channels, collecting three-phase current and zero-sequence current through four independent sets of current transformers. Specifically, the CT1 acquisition module collects the three-phase and zero-sequence current electrical signals from the high-voltage circuit breaker, converts them into weak current signals, and sends them to the MCU main control module.

[0028] The CT2 acquisition module includes three voltage acquisition channels, collecting electrical signals from three sets of Hall effect sensors through three resistor divider networks. Specifically, the CT2 acquisition module collects the closing current, opening current, and energy storage current signals of the high-voltage circuit breaker, converts them into weak current signals, and transmits them to the MCU main control module.

[0029] The PT acquisition module includes 4-way voltage acquisition, which collects three-phase voltage and zero-sequence voltage through 4 independent groups of resistor voltage divider networks. That is, the PT acquisition module is used to collect the three-phase voltage electrical signals and zero-sequence voltage electrical signals of the high-voltage circuit breaker, and convert them into weak current signals before sending them to the MCU main control module.

[0030] The temperature acquisition module collects the contact temperature of the high-voltage circuit breaker and transmits it to the MCU main control module. The temperature acquisition module includes a set of wireless signal receiving and processing modules. One end of the receiving and processing module exchanges data with the main control MCU via wired signals, and the other end is connected to a wireless receiving antenna. The receiving and processing module decodes the wireless signal from the contact temperature sensor (with a timed transmission function) and temporarily stores the decoded data until it is read by the MCU main control module. No edge computing or other processing is performed.

[0031] The pulse signal acquisition module is used for optical isolation and simultaneously collects the angular displacement pulse signal from the main shaft of the spring mechanism inside the high-voltage circuit breaker (the main shaft rotates during operation). It then reduces the voltage of the angular displacement pulse signal to the operating voltage of the MCU main control module and sends it to the MCU main control module. The pulse signal acquisition module includes four high-speed optocoupler isolation and processing circuitry. One end of the high-speed optocoupler is electrically connected to the MCU main control, with an electrical signal voltage range of 0-3.3VDC. The other end of the high-speed optocoupler connects to a reserved terminal for connecting to the high-speed pulse signal from the four angular displacement sensors (the output pulse of the angular displacement sensor is approximately 25 pulses per degree, with a frequency of MHz). The pulse signal voltage range is 0-5V. The high-speed optocoupler receives the high-speed pulse signal from the angular displacement sensor at a voltage of 0-5V, while the operating voltage of the MCU is 0-3.3V. The optocoupler provides both optical isolation and voltage conversion.

[0032] The switch quantity acquisition module collects the switch quantity of the high-voltage circuit breaker and transmits it to the MCU after electrical isolation by the optocoupler isolation module. The optocoupler isolation module contains eight independent optocouplers. One end of the optocoupler is electrically connected to the MCU, and the electrical signal voltage range is 0-3.3VDC. The other end of the optocoupler corresponds one-to-one with the eight switch quantity acquisition signals in the switch quantity acquisition module, and the electrical signal voltage range is 0-12VDC.

[0033] The communication module is connected to the external expansion terminal 6, and the MCU main control module uses the communication module and the external expansion terminal 6 to exchange information with the outside.

[0034] The communication module includes an RS-485 communication interface. One end of the communication interface is electrically connected to the MCU main control via the communication chip, and the other end is connected to a reserved terminal. External expansion terminal 6 is connected to the RS-485 communication interface. The MCU main control module exchanges information with the external (complete equipment or backend system) through external expansion terminal 6 in two ways. The first is through the RS-485 interface on the physical wiring, and the second is through a combination of passive signal lines and RS-485 interface on the physical wiring. The details are as follows:

[0035] The first method: The external expansion terminal 6 only uses the RS-485 interface. Through two wires, the communication protocol executes information interaction in the form of Modbus-RTU, sends digital monitoring signals to the outside, and receives control commands issued by the outside.

[0036] The second method: the external expansion terminal 6 sends the digital monitoring signal to the outside through the RS-485 interface, and the external expansion terminal 6 receives the control command issued from the outside through the passive signal line; the number of connections of the external expansion terminal 6 in the second method is six.

[0037] The number of wires in the first interactive mode is 2; the number of wires in the second interactive mode is 6.

[0038] Different from traditional design schemes: This application can realize the intelligent functions of high-voltage circuit breakers while simplifying wiring. Compared with the 58 wiring terminals of the secondary plug-in of the sensor high-voltage vacuum circuit breaker, the number of wiring in this application is reduced to a maximum of about 6, which greatly improves the wiring efficiency.

[0039] The MCU main control module is the core chip of the main control circuit board 5. It runs the timing collection program, real-time conversion program (electricity and SARS quantity are converted into digital quantity), communication program, etc. The MCU main control module is the Internet of Things carrier for program operation and the physical connection carrier for the gas module.

[0040] As an optional implementation, refer to Figure 2 The main control circuit board 5 further includes a multi-channel power supply module. The multi-channel power supply module is connected to the CT2 acquisition module, the temperature acquisition module, the pulse signal acquisition module, the optical coupler isolation module, and the MCU main control module, respectively, and is used to supply power to the CT2 acquisition module, the temperature acquisition module, the pulse signal acquisition module, the optical coupler isolation module, and the MCU main control module.

[0041] The multi-channel power supply module includes an AC / DC power supply control input, 12VDC output, 5VDC output, and 3.3VDC output. These outputs provide control power for the local digitization module, power for the optocoupler isolation circuit, operating power for the CT2 sampling module, operating power for the pulse sampling module, power for the MCU main control, and operating power for the temperature acquisition module. The operating voltage of the optocoupler isolation circuit is 12VDC, the operating voltage of the CT2 sampling module is 5VDC, the operating voltage of the pulse sampling module is 5VDC, the operating voltage of the MCU main control is 3.3VDC, and the operating voltage of the temperature acquisition module is 5VDC.

[0042] As an optional implementation, refer to Figure 2The main control circuit board 5 also includes an LED display module. The LED display module is connected to the MCU main control module and includes a multi-channel status indicator light 4 display unit. The multi-channel status indicator light 4 display unit is used to indicate power supply, communication, closing, opening, working position, test position, and abnormal alarm of the high-voltage circuit breaker.

[0043] The LED display module includes 7 status indicator lights 4 and their current-limiting resistors. The high-voltage circuit breaker can be closed and opened in the working position, with the closing circuit conducting and the opening circuit disconnected. The high-voltage circuit breaker can also be closed and opened in the test position, but the closing circuit will not conduct and the opening circuit will not disconnect. When the high-voltage circuit breaker is in the working position, the working position indicator light is on. When the high-voltage circuit breaker is in the test position, the test position indicator light is on. Situations in which the abnormal alarm indicator light is on include: program operation failure of the main control circuit board 5, communication abnormality, the high-voltage circuit breaker is neither in the working position nor in the test, and the high-voltage circuit breaker is neither closed nor opened.

[0044] As an optional implementation, please refer to Figure 2 The main control circuit board 5 further includes an active output module. The active output module is connected to the MCU main control module; the active output module is used to drive the energy storage motor, the closing coil and the opening coil according to the control instructions of the MCU main control module.

[0045] The active output module includes 3 sets of relay output control circuits. The relay coil circuit is electrically connected to the MCU main control through a transistor. One end of the main contact circuit is connected to the AC / DC power control power input, and the other end is connected to the reserved terminal.

[0046] Based on the above content, it can be concluded that: the external expansion terminal 6 includes 1 RS-485 communication, a total of 2 wires; 3 switch inputs and 1 switch input common terminal, a total of 4 wires; the above-mentioned external acquisition terminal 7 is provided with device power input, 12VDC output terminal, 5V power output terminal, opening and closing coil output terminal, energy storage motor output terminal; 5 switch input terminals; 4 groups of current transformer input terminals; 3 groups of Hall sensor input terminals; 4 groups of voltage transformer input terminals; 4 pulse input signals and 3 groups of active output terminals; all are collected and wired inside the high-voltage circuit breaker.

[0047] Figure 3-Figure 8The application circuit of the local digitization device for high-voltage circuit breakers is shown, including: A / B / C phase current and zero-sequence current measurement circuit; A / B / C phase voltage and zero-sequence voltage measurement circuit; closing current measurement circuit; opening current measurement circuit; energy storage current measurement circuit; contact temperature measurement circuit; angular displacement measurement circuit; energy storage, closing, and opening control circuits; communication circuit and energy storage status, closing status, opening status, working position status, test position status, closing command, opening command, and energy storage command monitoring circuits.

[0048] Figure 3 The diagram shows the A / B / C phase current and zero-sequence current measurement circuits, as well as the A / B / C phase voltage and zero-sequence voltage measurement circuits. The 1S1 terminals on the secondary sides of the four current transformers integrated into the high-voltage circuit breaker poles are connected one-to-one to the IA, IB, IC, and IL interfaces of the external acquisition terminal block 7. The IA, IB, IC, and IL interfaces of the external acquisition terminal block 7 are connected to the CT1 acquisition module. The IN interface of the external acquisition terminal block 7 is connected to the IS2 terminals on the secondary sides of the three current transformers that measure the three-phase current electrical signals of the high-voltage circuit breaker. The I0 interface of the external acquisition terminal block 7 is connected to the IS2 terminals on the secondary side of the one current transformer that measures the zero-sequence current electrical signals of the high-voltage circuit breaker, and is grounded. That is, the A / B / C phase current and zero-sequence current are connected to the IA / IB / IC / IL of the external acquisition terminal 7 of the local digitization module respectively starting from the 1S1 terminal on the secondary side of the current transformer integrated in the circuit breaker pole, and are connected to the IS2 on the secondary side of the current transformer from the IN and I0 outputs after passing through the internal CT1 acquisition module, and are grounded.

[0049] like Figure 3 As shown, terminals 1a, 1b, 1c, and da of the voltage transformer integrated into the pole of a high-voltage circuit breaker are connected to the UA, UB, UC, and UL interfaces of the external data acquisition terminal 7, respectively. The UA, UB, UC, and UL interfaces of the external data acquisition terminal 7 are connected to the PT data acquisition module. The UN and U0 interfaces of the external data acquisition terminal 7 are connected to the star point 0 and dn terminals of the voltage transformer's secondary side, respectively, with the dn terminal connected to ground. The voltage transformer is used to measure the three-phase voltage and zero-sequence voltage signals of the high-voltage circuit breaker. Specifically, the A / B / C phase voltages and zero-sequence voltages are connected from the voltage transformers 1a / 1b / 1c / da integrated into the pole of the circuit breaker to the UA / UB / UC / UL interfaces of the external data acquisition terminal 7 of the local digitization module, respectively. After passing through the internal PT data acquisition module, the outputs from UN / U0 are connected to the star point 0 and dn terminals of the voltage transformer's secondary side, with the dn terminal connected to ground.

[0050] Figure 4The diagram shows the closing current measurement circuit, opening current measurement circuit, and energy storage current measurement circuit. The first output terminals of the three sets of Hall sensors within the high-voltage circuit breaker body are connected one-to-one to the UH1, UF1, and UC1 interfaces of the external acquisition terminal block 7. The UH1, UF1, and UC1 interfaces of the external acquisition terminal block 7 are connected to the CT2 acquisition module. The UH2, UF2, and UC2 interfaces of the external acquisition terminal block 7 are connected one-to-one to the second output terminals of the three sets of Hall sensors. The three sets of Hall sensors are used to measure the closing current electrical signals, opening current electrical signals, and energy storage current electrical signals of the high-voltage circuit breaker. That is, the closing current measurement, opening current measurement, and energy storage current measurement loops start from the voltage output 1 end of the three groups of Hall sensors and are connected to UH1 / UF1 / UC1 of the external acquisition terminal 7 of the local digitization module, and are connected from the UH2 / UF2 / UC2 output of the internal CT2 acquisition module to the voltage output 2 end of the Hall sensor; and the 5VDC output of the multi-channel power supply module inside the local digitization module is connected to the voltage input 1 end and voltage input 2 end of the three groups of Hall sensors via the external acquisition terminal 7.

[0051] Figure 5 The angular displacement measurement circuit is shown. The output of the angular displacement sensor within the high-voltage circuit breaker is connected to the A+ and B+ interfaces of the external acquisition terminal 7. These interfaces are then connected to the pulse acquisition module, while the A- and B- interfaces of the external acquisition terminal 7 are connected to the angular displacement sensor. The angular displacement sensor is used to measure the angular displacement pulse signal of the main shaft of the spring mechanism within the high-voltage circuit breaker. Specifically, the angular displacement measurement output is sent from the angular displacement sensor to the A+ / B+ interfaces of the external acquisition terminal 7 of the local digitization module, then passes through the internal high-speed pulse acquisition module and returns to the angular displacement sensor from the A- / B- interfaces of the external acquisition terminal 7. Furthermore, the angular displacement sensor power supply terminal is connected to the 5VDC power supply of the multi-channel power supply module within the local digitization module via the local digitization module's external acquisition terminal 7.

[0052] Figure 6The energy storage, closing, and opening control circuits are shown. One end of the energy storage motor, one end of the closing coil, and one end of the opening coil are connected to the M+ interface, HQ+ interface, and FQ+ interface of the external acquisition terminal 7, respectively, in a one-to-one correspondence. The M+ interface, HQ+ interface, and FQ+ interface of the external acquisition terminal 7 are connected to the active output module. The M- interface, HQ- interface, and FQ- interface of the external acquisition terminal 7 are connected to the other end of the energy storage motor, the other end of the closing coil, and the other end of the opening coil, respectively, in a one-to-one correspondence. That is, the energy storage, closing, and opening controls are connected in series with different signal electrical contacts from one end of the energy storage motor, the closing coil, and the opening coil, respectively, and are connected to the M+ / HQ+ / FQ+ of the external acquisition terminal 7 of the local digitization module. After passing through the active output module inside the local digitization module, they are connected to the other end of the energy storage motor, the closing coil, and the opening coil through the M- / HQ- / FQ- of the external acquisition terminal 7.

[0053] The above-mentioned different signal nodes connected in series include energy storage control series un-energy storage state signal electrical contacts; closing control series energy storage state signal nodes and circuit breaker un-closed state signal electrical contacts; opening control series circuit breaker closed state signal electrical contacts.

[0054] Figure 7 The diagram shows the energy storage state, closing state, opening state, working position state, test position state, closing command, opening command, and energy storage command monitoring circuits. The switch state monitoring circuit in the high-voltage circuit breaker body is connected to the DI1, DI2, DI3, DI4, and DI5 interfaces of the external acquisition terminal 7, which are connected to the optocoupler isolation module. The switch control command monitoring circuit is connected to the DI6, DI7, and DI8 interfaces of the external acquisition terminal 7 via the external expansion terminal 6, which are connected to the optocoupler isolation module. The switch state monitoring circuit is used to detect the energy storage state, closing state, opening state, working position state, and test position state of the high-voltage circuit breaker. The switch control command monitoring circuit is used to detect the closing control command, opening control command, and energy storage control command of the high-voltage circuit breaker. That is, the energy storage state, closing state, opening state, working position state, and test position state are respectively connected to DI1 / DI2 / DI3 / DI4 / DI5 of the external acquisition terminal 7 through the optocoupler isolation module inside the above-mentioned local digital module; among them, the closing control, opening control, and energy storage control are respectively connected from the external expansion terminal 6 of the local digital module to DI6 / DI7 / DI8 of the external acquisition terminal 7 of the local digital module through the optocoupler isolation module.

[0055] Figure 8The communication circuit is shown, and the RS-485 communication is brought out through the external expansion terminal 6 of the local digitization module.

[0056] The present application realizes the centralized collection of all information such as voltage, current, temperature, speed, position, etc. in the high-voltage circuit breaker body, and uniformly converts them into digital signals, thereby simplifying the wiring while realizing the intelligent function of the high-voltage circuit breaker.

[0057] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above examples is only intended to help understand the method and core concept of this application. At the same time, for those skilled in the art, based on the concept of this application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. An on-site digitization device for a high-voltage circuit breaker, characterized in that: The local digitization device for high-voltage circuit breakers comprises: a main control circuit board, external acquisition terminals and external expansion terminals; The external data collection terminal is connected to the outer wall of the high-voltage circuit breaker. The external data collection terminal is used to collect various types of monitoring signals inside the high-voltage circuit breaker through the internal wiring of the high-voltage circuit breaker. The main control circuit board is used to uniformly convert various types of monitoring signals into digital monitoring signals, send the digital monitoring signals to the outside through external expansion terminals, and receive control commands issued by the outside.

2. The on-site digitization device for high-voltage circuit breaker according to claim 1, characterized in that: The main control circuit board includes: CT1 acquisition module, CT2 acquisition module, PT acquisition module, temperature acquisition module, pulse signal acquisition module, switch value acquisition module, optical coupler isolation module, communication module and MCU main control module; The CT1 acquisition module, CT2 acquisition module, PT acquisition module, temperature acquisition module, pulse signal acquisition module, switch quantity acquisition module, optocoupler isolation module and communication module are all connected to the MCU main control module; The CT1 acquisition module is used to collect the three-phase current electrical signals and zero-sequence current electrical signals of the high-voltage circuit breaker, convert them into weak current signals, and send them to the MCU main control module; The CT2 acquisition module is used to collect the closing current signal, opening current signal and energy storage current signal of the high-voltage circuit breaker, and convert them into weak current signals before sending them to the MCU main control module; The PT acquisition module is used to collect the three-phase voltage electrical signals and zero-sequence voltage electrical signals of the high-voltage circuit breaker, and convert them into weak current signals before sending them to the MCU main control module; The temperature acquisition module is used to collect the contact temperature of the high-voltage circuit breaker and send it to the MCU main control module; The pulse signal acquisition module is used for photoelectric isolation and simultaneously collects the angular displacement pulse signal of the main shaft of the spring mechanism inside the high-voltage circuit breaker, reduces the voltage of the angular displacement pulse signal to the operating voltage of the MCU main control module, and sends it to the MCU main control module; The switch quantity acquisition module is used to collect the switch quantity of the high-voltage circuit breaker, and after being electrically isolated by the optocoupler isolation module, it is sent to the MCU main control module; The communication module is connected to the external expansion terminal, and the MCU main control module uses the communication module and the external expansion terminal to exchange information with the outside.

3. The on-site digitization device for high-voltage circuit breaker according to claim 2, characterized in that: The communication module includes 1 RS-485 communication interface; The external expansion terminal is connected to the RS-485 communication interface; The MCU main control module exchanges information with the outside world in two ways through the external expansion terminals; The first method: The external expansion terminal only uses the RS-485 interface to send digital monitoring signals to the outside through two wires and receive control commands from the outside; The second method: the external expansion terminal sends the digital monitoring signal to the outside through the RS-485 interface, and the external expansion terminal receives the control command issued from the outside through the passive signal line; the number of connections of the external expansion terminal in the second method is six.

4. The on-site digitization device for high-voltage circuit breaker according to claim 2, characterized in that: The main control circuit board also includes: a multi-channel power supply module; The multi-channel power supply module is respectively connected to the CT2 acquisition module, temperature acquisition module, pulse signal acquisition module, optocoupler isolation module and MCU main control module. The multi-channel power supply module is used to power the CT2 acquisition module, temperature acquisition module, pulse signal acquisition module, optocoupler isolation module and MCU main control module.

5. The on-site digitization device for high-voltage circuit breaker according to claim 2, characterized in that: The main control circuit board also includes: an LED display module; The LED display module is connected to the MCU main control module; The LED display module includes a multi-channel status indicator light display unit; the multi-channel status indicator light display unit is used to provide power indication, communication indication, closing indication, opening indication, working position indication, test position indication and abnormal alarm indication of the high-voltage circuit breaker.

6. The on-site digitization device for high-voltage circuit breaker according to claim 2, characterized in that: The main control circuit board also includes: an active output module; The active output module is connected to the MCU main control module; The active output module is used to drive the energy storage motor, closing coil and opening coil according to the control instructions of the MCU main control module.

7. The on-site digitization device for high-voltage circuit breaker according to claim 2, characterized in that: The 1S1 terminals on the secondary sides of the four sets of current transformers integrated in the high-voltage circuit breaker poles are connected one-to-one to the IA interface, IB interface, IC interface, and IL interface of the external acquisition terminal block. The IA interface, IB interface, IC interface, and IL interface of the external acquisition terminal block are connected to the CT1 acquisition module; the IN interface of the external acquisition terminal block is connected to the IS2 terminals on the secondary sides of the three sets of current transformers for measuring the three-phase current electrical signals of the high-voltage circuit breaker; the I0 interface of the external acquisition terminal block is connected to the IS2 terminals on the secondary side of the set of current transformers for measuring the zero-sequence current electrical signals of the high-voltage circuit breaker, and is grounded; The first output ends of the three sets of Hall sensors in the high-voltage circuit breaker body are connected to the UH1 interface, UF1 interface, and UC1 interface of the external acquisition terminal block in a one-to-one correspondence. The UH1 interface, UF1 interface, and UC1 interface of the external acquisition terminal block are connected to the CT2 acquisition module. The UH2 interface, UF2 interface, and UC2 interface of the external acquisition terminal block are respectively connected to the second output ends of the three sets of Hall sensors in a one-to-one correspondence. The three sets of Hall sensors are used to measure the closing current electrical signal, the opening current electrical signal, and the energy storage current electrical signal of the high-voltage circuit breaker. The 1a, 1b, 1c, and da terminals of the voltage transformer integrated into the high-voltage circuit breaker pole are connected to the UA, UB, UC, and UL interfaces of the external data acquisition terminal blocks, respectively. The UA, UB, UC, and UL interfaces of the external data acquisition terminal blocks are connected to the PT data acquisition module. The UN and U0 interfaces of the external data acquisition terminal blocks are connected to the star point 0 and dn terminals of the secondary side of the voltage transformer, respectively, and the dn terminal is grounded. The voltage transformer is used to measure the three-phase voltage electrical signals and zero-sequence voltage electrical signals of the high-voltage circuit breaker. The output end of the angular displacement sensor in the high-voltage circuit breaker body is connected to the A+ and B+ interfaces of the external acquisition terminal, which are connected to the pulse acquisition module, and the A- and B- interfaces of the external acquisition terminal are connected to the angular displacement sensor; the angular displacement sensor is used to measure the angular displacement pulse signal of the main shaft of the spring mechanism inside the high-voltage circuit breaker; The switch quantity status monitoring circuit in the high-voltage circuit breaker body is connected to the DI1 interface, DI2 interface, DI3 interface, DI4 interface, and DI5 interface of the external acquisition terminal, and the DI1 interface, DI2 interface, DI3 interface, DI4 interface, and DI5 interface of the external acquisition terminal are connected to the optocoupler isolation module; the switch quantity control command monitoring circuit is connected to the DI6 interface, DI7 interface, and DI8 interface of the external acquisition terminal through the external expansion terminal, and the DI6 interface, DI7 interface, and DI8 interface of the external acquisition terminal are connected to the optocoupler isolation module; the switch quantity status monitoring circuit is used to detect the energy storage state, closing state, opening state, working position state, and test position state of the high-voltage circuit breaker; the switch quantity control command monitoring circuit is used to detect the closing control command, opening control command, and energy storage control command of the high-voltage circuit breaker.

8. The on-site digitization device for high-voltage circuit breaker according to claim 6, characterized in that: One end of the energy storage motor, one end of the closing coil, and one end of the opening coil are respectively connected to the M+ interface, HQ+ interface, and FQ+ interface of the external data acquisition terminal. The M+ interface, HQ+ interface, and FQ+ interface of the external data acquisition terminal are connected to the active output module. The M- interface, HQ- interface, and FQ- interface of the external data acquisition terminal are respectively connected to the other end of the energy storage motor, the other end of the closing coil, and the other end of the opening coil.

9. The on-site digitization device for high-voltage circuit breaker according to claim 1, characterized in that: The local digital device for high-voltage circuit breakers further comprises: a sealed housing and a status indicator light; The main control circuit board is arranged in the sealed housing; the external acquisition wiring terminals and the status indicator light are both arranged on the sealed housing; the external expansion wiring terminals pass through the sealed housing and are connected to the main control circuit board; The control end of the status indicator light is connected to the signal output end of the main control circuit board.

10. The on-site digitization device for high-voltage circuit breaker according to claim 9, characterized in that: The on-site digitization device for high-voltage circuit breakers further comprises: a shock-absorbing bracket, a plurality of buffer pads, and a plurality of mounting studs; A plurality of buffer pads are arranged between the shock absorbing bracket and the sealing shell; A plurality of mounting studs are arranged on the shock-absorbing bracket; the plurality of mounting studs are matched one by one with a plurality of mounting holes arranged on the outer side of the sealing shell, and are fastened and connected by bolts.

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