Circuit breaker phase selection device and method based on multi-source sensing

Abstract

In the device, the output end of a power supply system is connected with the input ends of a universal sensor interface, a signal processing circuit A, a signal processing circuit B, an analog-to-digital converter, a ZYNQ controller and a digital isolator, and the output end of the universal sensor interface is connected with the input end of the ZYNQ controller; the output ends of the voltage transformer interface and the current transformer interface are connected with the input end of the signal processing circuit A. The output end of the signal processing circuit A is connected with the input end of the analog-to-digital converter. The output end of the control voltage measuring interface is connected with the input end of the signal processing circuit B. The output end of the signal processing circuit B is connected with the input end of the analog-to-digital converter. The output end of the analog-to-digital converter is connected with the input end of the ZYNQ controller; the input end of the digital isolator is connected with the output end of the command input module and the output end of the ZYNQ controller. And the ZYNQ controller is connected with the SD card and the network port.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker closing phase control, and in particular to a circuit breaker phase selection device and method based on multi-source sensing. Background Art

[0002] The phase selection closing controller is an intelligent control device for the closing phase control of the circuit breaker. It can select the phase with the smallest transient impact to complete the closing operation of the switch according to different users, reduce the inrush current impact or transient overvoltage generated by the closing process, and improve the service life of electrical components. At present, there are many phase selection devices on the market. Most of them have a small number of sensor types and interfaces, and their versatility is poor. There are many factors that affect the opening and closing action time of the circuit breaker. Among them, the coil current directly affects the mechanism action speed; external factors such as ambient temperature, air chamber pressure, mechanism oil pressure, spring pressure, control voltage, etc. will affect the opening and closing action time of the circuit breaker, resulting in the circuit breaker being unable to open and close at the preset optimal opening and closing phase point; and the secondary side signal of the voltage / current transformer is an important basis for whether the circuit breaker is opened and closed.

[0003] The information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0004] In view of the shortcomings or defects of the prior art, a circuit breaker phase selection device and method based on multi-source sensing is provided to achieve the access and collection of multiple sensors, adopt a unified electrical interface and communication interface, have strong versatility and improve the accuracy of circuit breaker opening and closing time verification.

[0005] The purpose of the present invention is achieved through the following technical solutions.

[0006] A circuit breaker phase selection device comprises a power supply system, a voltage transformer interface, a current transformer interface and a control voltage measurement interface, wherein the output end of the power supply system is respectively connected to the input end of a universal sensor interface, a signal processing circuit A, a signal processing circuit B, an analog-to-digital converter, a ZYNQ controller and a digital isolator, and the output end of the universal sensor interface is connected to the input end of the ZYNQ controller;

[0007] The output ends of the voltage transformer interface and the current transformer interface are connected to the input end of the signal processing circuit A, and the output end of the processing circuit A is connected to the input end of the analog-to-digital converter;

[0008] The output end of the control voltage measurement interface is connected to the input end of the signal processing circuit B, and the output end of the signal processing circuit B is connected to the input end of the analog-to-digital converter;

[0009] The output end of the analog-to-digital converter is connected to the input end of the ZYNQ controller;

[0010] The input end of the digital isolator is respectively connected to the output end of the command input module and the ZYNQ controller; the output end of the digital isolator is respectively connected to the input end of the command output module and the ZYNQ controller;

[0011] The ZYNQ controller is connected to the SD card and the network port.

[0012] In the circuit breaker phase selection device, the universal sensor interface includes a SF12-4 aviation socket for connecting six sensor signals including a coil current sensor, a stroke sensor, a temperature sensor, an air pressure sensor, an oil pressure sensor and a spring pressure sensor.

[0013] In the circuit breaker phase selection device, the communication interface between the universal sensor interface and the ZYNQ controller is RS485, and the communication protocol is MODBUS-RTU.

[0014] In the circuit breaker phase selection device, the voltage transformer interface, the current transformer interface and the control voltage measurement interface all include SF10 aviation sockets respectively connected to three-phase voltage signals, three-phase current signals and control voltage signals.

[0015] In the circuit breaker phase selection device, the signal processing circuit A includes an isolation amplifier and a precision operational amplifier.

[0016] In the circuit breaker phase selection device, the signal processing circuit B includes a voltage-dividing resistor that reduces the input signal to 5V, an isolation amplifier connected to the voltage-dividing resistor, and a precision operational amplifier.

[0017] In the circuit breaker phase selection device, the command input module divides the input command signal through a diode and converts it into a logic level signal through an optocoupler element.

[0018] In the circuit breaker phase selection device, the command output module converts the logic level signal into a 24V voltage signal through an optocoupler element, and then controls the solid-state relay through the 24V voltage signal to achieve the output of the 220V phase selection control command.

[0019] In the circuit breaker phase selection device, the power supply system, signal processing circuit A, signal processing circuit B, digital-to-analog converter, ZYNQ controller, digital isolator, SD card and network port are all arranged on a circuit board, and the circuit board is provided with interfaces corresponding to the coil current sensor, stroke sensor, temperature sensor, air pressure sensor, oil pressure sensor, spring pressure sensor, voltage transformer, current transformer, control voltage signal, command output module and command input module.

[0020] The arrangement method of the circuit breaker phase selection device includes:

[0021] Connecting and installing the circuit breaker phase selection device;

[0022] The circuit breaker phase selection device performs electromagnetic compatibility protection, wherein an RC absorber is installed in the circuit breaker to suppress the generation of high-frequency surge voltage; a freewheeling diode is added to the relay coil to reduce transient interference during switching action; a filter and a damping circuit are added to the electromagnet equipment to reduce harmonics and high-frequency interference during operation, an AC power filter is added to the power supply end to block differential mode and common mode interference on the power line; a magnetic ring and a common mode choke are used at the signal line access end to reduce conducted interference; shielded cables and grounding are used for cables outside the control cabinet to reduce spatial coupling effects; a shielding cover is set around the circuit breaker phase selection device to isolate strong electromagnetic radiation interference, an isolation transformer or an optoelectronic isolation module is added to the communication interface to avoid interference coupling formed by the ground loop, and a common mode inductor and an electrostatic discharge protector are introduced into the sensor access signal to shield high-frequency interference;

[0023] The triggering, collection, storage and transmission of signals are performed based on the circuit breaker phase selection device.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a stable circuit breaker phase selection device that performs multi-dimensional sampling of circuit breaker signals through coil current sensors, travel sensors, temperature sensors, air pressure sensors, oil pressure sensors, spring pressure sensors, voltage transformers, current transformers, and control voltage measuring devices, wherein the digital signals of the sensors are received through a universal sensor interface; the transformer signals and control voltage signals are converted into digital signals through an analog-to-digital converter. The ZYNQ controller receives the above digital signals at the PL end. The types and number of sensors that can be connected to the device are increased, which improves the accuracy of circuit breaker opening and closing time verification; various sensor interfaces are unified and reusable, which increases the types and number of sensor accesses, unifies the electrical interface and communication interface between the sensor and the device, improves the versatility of the device, and facilitates subsequent maintenance and optimization and upgrading.

[0026] The above description is only an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and to achieve the extent that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] By reading the detailed description of the preferred specific embodiments below, various other advantages and benefits of the present invention will become clear to those of ordinary skill in the art. The drawings in the specification are only for the purpose of illustrating the preferred embodiments and are not considered to be limitations of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work. Moreover, the same reference numerals are used to represent the same components throughout the drawings.

[0028] In the attached picture:

[0029] Figure 1 is a structural diagram of the device shown in an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the arrangement of the device shown in an embodiment of the present invention;

[0031] Figure 3 is a flow chart of performing electromagnetic protection on a device shown in an embodiment of the present invention;

[0032] Figure 4 is a RC absorption circuit diagram shown in an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of a grounding scheme shown in an embodiment of the present invention;

[0034] Among them: 10-power supply system; 11-universal sensor interface; 12-voltage transformer interface; 13-current transformer interface; 14-control voltage measurement interface; 15-signal processing circuit A; 16-signal processing circuit B; 17-analog-to-digital converter; 18-ZYNQ controller; 19-digital isolator; 110-SD card; 111-network port; 112-command input module; 113-command output module.

[0035] The present invention is further explained below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0036] The specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the specific embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] It should be noted that certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that technicians may use different nouns to refer to the same component. This specification and claims do not use the difference in nouns as a way to distinguish components, but use the difference in the functions of the components as the criterion for distinction. As mentioned throughout the specification and claims, "including" or "comprising" is an open term, so it should be interpreted as "including but not limited to". The subsequent description of the specification is a preferred embodiment of the present invention, but the description is based on the general principles of the specification and is not intended to limit the scope of the present invention. The scope of protection of the present invention shall be determined by the attached claims.

[0038] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each of the accompanying drawings does not constitute a limitation on the embodiments of the present invention.

[0039] For a better understanding, Figures 1 to 5 As shown, a circuit breaker phase selection device includes a power supply system 10, a voltage transformer interface 12, a current transformer interface 13 and a control voltage measurement interface 14, the output end of the power supply system is respectively connected to the input end of the universal sensor interface 11, the signal processing circuit A15, the signal processing circuit B16, the analog-to-digital converter 17, the ZYNQ controller 18 and the digital isolator 19, and the output end of the universal sensor interface 11 is connected to the input end of the ZYNQ controller 18;

[0040] The output ends of the voltage transformer interface and the current transformer interface are connected to the input end of the signal processing circuit A15, and the output end of the processing circuit A15 is connected to the input end of the analog-to-digital converter 17;

[0041] The output end of the control voltage measurement interface 14 is connected to the input end of the signal processing circuit B16, and the output end of the signal processing circuit B16 is connected to the input end of the analog-to-digital converter 17;

[0042] The output end of the analog-to-digital converter 17 is connected to the input end of the ZYNQ controller 18;

[0043] The input end of the digital isolator 19 is respectively connected to the output end of the command input module 112 and the ZYNQ controller 18; the output end of the digital isolator 19 is respectively connected to the input end of the command output module 113 and the ZYNQ controller 18;

[0044] The ZYNQ controller 18 is connected to the SD card 110 and the network port 111 .

[0045] In a preferred embodiment of the circuit breaker phase selection device, the universal sensor interface 11 includes a SF12-4 aviation socket for connecting six sensor signals of a coil current sensor, a stroke sensor, a temperature sensor, an air pressure sensor, an oil pressure sensor and a spring pressure sensor.

[0046] In a preferred embodiment of the circuit breaker phase selection device, the communication interface between the universal sensor interface 11 and the ZYNQ controller 18 is RS485, and the communication protocol is MODBUS-RTU.

[0047] In a preferred embodiment of the circuit breaker phase selection device, the voltage transformer interface 12, the current transformer interface 13 and the control voltage measurement interface 14 all include SF10 aviation sockets respectively connected to three-phase voltage signals, three-phase current signals and control voltage signals.

[0048] In a preferred embodiment of the circuit breaker phase selection device, the signal processing circuit A15 includes an isolation amplifier and a precision operational amplifier.

[0049] In a preferred embodiment of the circuit breaker phase selection device, the signal processing circuit B16 includes a voltage-dividing resistor that reduces the input signal to 5V, an isolation amplifier connected to the voltage-dividing resistor, and a precision operational amplifier.

[0050] In a preferred embodiment of the circuit breaker phase selection device, the command input module 112 divides the input command signal through a diode and converts it into a logic level signal through an optocoupler element.

[0051] In a preferred embodiment of the circuit breaker phase selection device, the command output module 113 converts the logic level signal into a 24V voltage signal through an optocoupler element, and then controls the solid-state relay through the 24V voltage signal to output a 220V phase selection control command.

[0052] In a preferred embodiment of the circuit breaker phase selection device, the power supply system 10, signal processing circuit A15, signal processing circuit B16, digital-to-analog converter 17, ZYNQ controller 18, digital isolator 19, SD card 110 and network port 111 are all arranged on a circuit board, and the circuit board is provided with interfaces corresponding to the coil current sensor, stroke sensor, temperature sensor, air pressure sensor, oil pressure sensor, spring pressure sensor, voltage transformer, current transformer, control voltage signal, command output module 113 and command input module 112.

[0053] In a preferred embodiment of the circuit breaker phase selection device, it also includes an electromagnetic interference protector and a vibration reduction component.

[0054] The arrangement method of the circuit breaker phase selection device includes:

[0055] Connecting and installing the circuit breaker phase selection device;

[0056] The circuit breaker phase selection device performs electromagnetic compatibility protection, wherein an RC absorber is installed in the circuit breaker to suppress the generation of high-frequency surge voltage; a freewheeling diode is added to the relay coil to reduce transient interference during switching action; a filter and a damping circuit are added to the electromagnet equipment to reduce harmonics and high-frequency interference during operation, an AC power filter is added to the power supply end to block differential mode and common mode interference on the power line; a magnetic ring and a common mode choke are used at the signal line access end to reduce conducted interference; shielded cables and grounding are used for cables outside the control cabinet to reduce spatial coupling effects; a shielding cover is set around the circuit breaker phase selection device to isolate strong electromagnetic radiation interference, an isolation transformer or an optoelectronic isolation module is added to the communication interface to avoid interference coupling formed by the ground loop, and a common mode inductor and an electrostatic discharge protector are introduced into the sensor access signal to shield high-frequency interference;

[0057] The triggering, collection, storage and transmission of signals are performed based on the circuit breaker phase selection device.

[0058] In one embodiment, see Figure 1The embodiment of the present invention discloses a circuit breaker phase selection device, including a power supply system 10; a universal sensor interface 11; a voltage transformer interface 12; a current transformer interface 13; a control voltage measurement interface 14; a signal processing circuit A 15; a signal processing circuit B 16; an analog-to-digital converter 17; a ZYNQ controller 18; a digital isolator 19; an SD card 110; a network port 111; a command input module 112; and a command output module 113. The output end of the power supply system 10 is respectively connected to the input end of the universal sensor interface 11, the signal processing circuit A15, the signal processing circuit B16, the analog-to-digital converter 17, the ZYNQ controller 18 and the digital isolator 19; the output end of the universal sensor interface 11 is connected to the input end of the ZYNQ controller 18; it includes a voltage transformer interface 12 and a current transformer interface 13, the output ends of the voltage transformer interface 12 and the current transformer interface 13 are connected to the input end of the signal processing circuit A15; the output end of the processing circuit A15 is connected to the input end of the analog-to-digital converter 17; it includes a control voltage measurement The output end of the control voltage measurement interface 14 is connected to the input end of the signal processing circuit B16; the output end of the signal processing circuit B16 is connected to the input end of the analog-to-digital converter 17; the output end of the analog-to-digital converter 17 is connected to the input end of the ZYNQ controller 18; the input end of the digital isolator 19 is respectively connected to the command input module 112 and the output end of the ZYNQ controller 18; the output end of the digital isolator 19 is respectively connected to the command output module 113 and the input end of the ZYNQ controller 18; the ZYNQ controller 18 is connected to the SD card 110 and the network port 111.

[0059] Furthermore, in an embodiment of the present invention, the power supply system 10, the signal processing circuit A15, the signal processing circuit B16, the digital-to-analog converter 17, the ZYNQ controller 18, the digital isolator 19, the SD card 110, and the network port 111 are all arranged on a circuit board; the circuit board is provided with 6 universal sensor interfaces, each of which includes a voltage interface and a digital signal interface. The voltage interface includes a +5V voltage interface and a -5V voltage interface, which are used to connect the power supply system 10; the digital signal interface is respectively connected to the digital signals corresponding to the coil current sensor, the stroke sensor, the temperature sensor, the air pressure sensor, the oil pressure sensor, and the spring pressure sensor, and transmits them to the ZYNQ controller 18.

[0060] Furthermore, in an embodiment of the present invention, a voltage transformer interface 12 and a current transformer interface 13 are provided on the circuit board, which respectively include a three-phase voltage signal interface and a three-phase current signal interface. The three-phase voltage mutual inductance signal and the three-phase current mutual inductance signal are connected to the signal processing circuit A15 through the voltage signal interface and the current signal interface respectively.

[0061] Furthermore, in an embodiment of the present invention, the signal processing circuit A15 includes an isolation amplifier and a precision operational amplifier.

[0062] Furthermore, in the embodiment of the present invention, a control voltage measurement interface 14 is provided on the circuit board for connecting the control voltage signal with the signal processing circuit B16.

[0063] Furthermore, in the embodiment of the present invention, the signal processing circuit B16 reduces the input signal to 5V through a voltage-dividing resistor, and then passes through an isolation amplifier and a precision operational amplifier.

[0064] Furthermore, in the embodiment of the present invention, the ZYNQ controller 18 is connected to the command input module 112 and the command output module 113 via the digital isolator 19 to isolate the digital signal.

[0065] Furthermore, in the embodiment of the present invention, the command input module 112 divides the voltage of the command signal through a diode, and converts it into a logic level signal through an optocoupler element.

[0066] Furthermore, in the embodiment of the present invention, the command output module 113 converts the logic level signal into a 24V voltage signal through an optocoupler element, and then controls the solid-state relay through the signal to output a 220V phase selection control command.

[0067] Furthermore, in an embodiment of the present invention, the power supply system 10 is composed of a multi-stage DC-DC power supply module, with an input of 9-18V DC voltage and an output of ±5V DC voltage, wherein the output voltage to the universal sensor interface 11 is +5V and -5V, and the output voltage to the signal processing circuit A15, signal processing circuit B16, analog-to-digital converter 17, ZYNQ controller 18 and digital isolator 19 are all +5V.

[0068] The specific application of the device disclosed in the embodiment of the present invention is:

[0069] Install the device disclosed in the embodiment of the present invention;

[0070] The device performs electromagnetic compatibility protection, sets up electromagnetic protection to suppress the propagation of electromagnetic noise in space, and cuts off the propagation path of radiated electromagnetic noise;

[0071] Signal triggering, acquisition, storage and transmission.

[0072] In view of the electromagnetic interference that the intelligent phase selection device of the circuit breaker may be subject to, a systematic electromagnetic compatibility protection solution is proposed in combination with the access characteristics of the intelligent phase selection device and the sensor. Further, by suppressing the interference source, cutting off the interference coupling path, protecting sensitive ports, adding electromagnetic interference protectors at key locations, optimizing PCB design and taking vibration reduction measures, the stable operation of the device in different scenarios and voltage levels is ensured.

[0073] Further, the device disclosed in the embodiment of the present invention is installed, see Figure 2 , each sensor data is connected to the corresponding STM32F103ZET6 processing module through the SF12-4 aviation plug. The processing module converts the analog signal transmitted by the sensor into a digital signal, and then connects it to the corresponding universal sensor interface in the intelligent phase selection device disclosed in the embodiment of the present invention through the RS485 communication interface; the voltage transformer interface, the current transformer interface, and the control voltage measurement interface are respectively connected to the voltage transformer, the current transformer, and the control voltage through the SF10 aviation plug; the command input interface and the command output interface are respectively connected to the opening and closing command input circuit and the opening and closing coil.

[0074] Furthermore, in the electromagnetic compatibility protection of the device, first of all, the interference source should be suppressed as much as possible: the core goal of this solution is to ensure the efficiency and stability of the circuit breaker intelligent phase selection device in electromagnetic compatibility by identifying and suppressing possible interference sources. According to the specific use scenario of the sensor, it is first necessary to identify potential interference sources, such as high-frequency pulse interference, arc discharge, transient overvoltage generated during switch action, radio frequency interference, etc. The amplitude, mode and frequency distribution of these interference sources are confirmed through field testing and spectrum analysis to comprehensively evaluate the impact of the interference sources. Through testing and analysis of various potential interference sources, an electromagnetic protection solution for suppressing interference sources is obtained. See Figure 4 , installing an RC absorber in the circuit breaker can suppress the generation of high-frequency surge voltage; adding a freewheeling diode to the relay coil can reduce the transient interference during the switch action; adding filters and damping circuits to the electromagnet equipment can reduce harmonics and high-frequency interference during operation. Secondly, cut off the coupling path between the interference source and the phase selection device: In the electromagnetic compatibility protection design of the circuit breaker phase selection device, cutting off the coupling path between the interference source and the intelligent phase selection device is a crucial link. Interference signals enter the control system through different pathways, which may have a significant impact on the normal operation of the system. To this end, this scheme first identifies the way in which interference is transmitted to the phase selection device through power lines, signal lines, and ground loops based on theoretical analysis and data query, and proposes specific blocking strategies based on these coupling paths to ensure the electromagnetic compatibility of the system. Install an AC power filter at the power supply end to block differential and common mode interference on the power line; use magnetic rings and common mode chokes at the signal line access end to reduce conducted interference; use shielded cables and reasonable grounding for cables outside the control cabinet to reduce spatial coupling effects; set a shielding cover around the equipment to effectively isolate strong electromagnetic radiation interference.

[0075] refer to Figure 5According to the spatial layout characteristics of the sensor, a series single-point grounding or parallel multi-point grounding method can be used. The specific installation principles are as follows: For equipment whose installation location is far away from the operating mechanism and the primary current is large, a series grounding method should be used; for equipment close to the primary conductor, in order to avoid the influence of ground potential rise, a parallel grounding method should be used. The grounding points 1, 2 and 3 shown in the figure are the key points for the protective shell to connect to the internal ground potential.

[0076] Furthermore, the sensitive ports are isolated and protected. In the electromagnetic compatibility protection design of the intelligent phase selection device of the circuit breaker, the isolation protection of the sensitive ports is crucial. These sensitive ports are key parts that are susceptible to external interference, which may cause misoperation of the control system, data loss or equipment failure. In order to effectively protect these sensitive ports, a series of isolation protection measures need to be taken to cut off the coupling path of the interference source to ensure the reliable transmission of the signal and the stable operation of the system. According to the signal reception and corresponding characteristics of different interfaces, an isolation transformer or optoelectronic isolation module is added to the communication interface to avoid interference coupling formed by the ground loop. Common mode inductors and electrostatic discharge protectors are introduced into the sensor access signal to shield high-frequency interference.

[0077] Furthermore, electromagnetic interference protection is added to key locations: the following protection measures are added to key nodes of the control device: LC filters and shielded grounding layers are configured at the input and output ends of the circuit board; metal isolation covers are set between modules to prevent internal high-frequency signals from interfering with each other. Leakage current can be suppressed by increasing the insulation resistance of the circuit board surface or by directing the leakage current to other circuits before entering the signal input pin. Specific measures include the use of protection rings and polytetrafluoroethylene terminal technology.

[0078] In the anti-leakage current technology, the potential of the guard ring is designed to be the same as that of the signal input terminal, ensuring that the leakage current entering the amplifier input pin is kept to a minimum regardless of changes in the external environment. The guard ring has a hemispherical structure and covers the outside of the input terminal terminal, which is connected to the sensor analog output signal line. The guard ring maintains the same potential as the input terminal, thereby effectively directing the leakage current into other loops. In addition, the connection between the input terminal terminal and the printed circuit board is insulated and coated with polytetrafluoroethylene material. This design can significantly improve the insulation resistance of the circuit board surface and further reduce the generation and interference of leakage current.

[0079] Furthermore, the wiring is optimized in the PCB design to improve its anti-electromagnetic interference performance. When designing the PCB of the device, a systematic design scheme is used to enhance its anti-electromagnetic interference capability. The following key principles are followed in PCB design:

[0080] (a) Allocate independent areas for the power layer and the ground layer, thereby effectively reducing common-mode interference and reducing point source impedance;

[0081] (b) Keep the power plane and ground plane close to each other as much as possible, and usually place the ground plane above the power plane;

[0082] (c) Properly distribute digital and analog circuits in different layers to reduce mutual interference;

[0083] (d) The wiring layer should be preferably adjacent to the whole metal plane to improve the anti-interference performance;

[0084] (e) Separate layout and processing are performed for major interference sources such as clock circuits and high-frequency circuits.

[0085] Follow these principles in PCB layout design:

[0086] (a) Arrange the functional modules reasonably according to the transmission path of the circuit signal to ensure that the signal flow direction remains consistent;

[0087] (b) Taking the core component of each functional module as the center, other related components are arranged around the core component;

[0088] (c) Try to shorten the connection length between high-frequency components to reduce the impact of their distributed capacitance and inductance;

[0089] (d) Components susceptible to interference should be kept at appropriate distances, and input and output components should be arranged separately to avoid interference;

[0090] (e) Isolate power lines, high-frequency signal lines and other lines to prevent adverse coupling between them.

[0091] The following basic principles should be followed in PCB wiring design:

[0092] (a) Avoid long parallel runs of the input and output traces. To reduce crosstalk between parallel traces, increase the spacing between them or insert a ground wire between them.

[0093] (b) Ensure that the conductor width of the circuit board remains uniform and avoids sudden changes; try to use arc-shaped or 135-degree angle designs for corners to maintain impedance continuity of the circuit;

[0094] (c) For high-frequency circuits, special attention should be paid to the reasonable distribution of power lines and ground lines to reduce interference;

[0095] (d) Minimize the area of ​​the conductor loop, as the radiation intensity of the loop is proportional to the current flowing through it, the loop area and the signal frequency;

[0096] (e) In the design of the circuit board plug, more dispersed ground input pins are set, which helps to reduce the area of ​​the plug wiring loop and reduce the ground impedance;

[0097] (f) Shorten the wire length and increase the wire width to effectively reduce the line impedance and improve the performance of the circuit.

[0098] Finally, take interference vibration reduction measures: In the electromagnetic compatibility protection design of the circuit breaker intelligent phase selection device, protection against vibration interference is also crucial. Mechanical vibration in the environment may affect the performance of sensitive components, especially sensors, connectors and electrical connections, resulting in signal errors, poor contact or equipment failure. Install vibration dampers, such as rubber vibration damping pads or spring vibration damping devices, on the bottom or supporting structure of the equipment. The vibration damper can effectively absorb and alleviate the mechanical vibration generated during the operation of the equipment and prevent the vibration from being transmitted to sensitive electronic components. In the mechanical connection parts inside the equipment, especially the installation areas of sensors and connectors, damping gaskets are used to reduce the impact of vibration on the connector. Damping gaskets can absorb mechanical vibration and impact energy, reduce the impact of vibration on electrical connectors, and thus improve contact reliability and stability. Use anti-vibration connectors and stable mounting brackets to ensure the mechanical stability of the device for long-term operation.

[0099] In a specific embodiment of the device, the system can perform sampling triggering through all analog channels, the sampling data can be traced back to 10,000 sampling points before the starting point, the cache space has 2MB of space, and after the sampling is completed, it can be uploaded through the communication interface.

[0100] The embodiments of the present invention are mainly used in scenarios with phase selection control function. The present invention has the function of real-time perception of ambient temperature, control voltage, oil pressure, spring pressure and other states, can respond to circuit breaker operation characteristics in real time, and the sensor interface is unified and reusable. It adopts an electromagnetic compatibility protection scheme that can adapt to different scenarios and voltage levels, and can effectively shield the complex electromagnetic environment in the high-voltage field.

[0101] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0102] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A circuit breaker phase selection device, characterized in that: It comprises a power supply system (10), a voltage transformer interface (12), a current transformer interface (13) and a control voltage measurement interface (14); the output end of the power supply system is respectively connected to the input end of a universal sensor interface (11), a signal processing circuit A (15), a signal processing circuit B (16), an analog-to-digital converter (17), a ZYNQ controller (18) and a digital isolator (19); the output end of the universal sensor interface (11) is connected to the input end of the ZYNQ controller (18); The output ends of the voltage transformer interface and the current transformer interface are connected to the input end of the signal processing circuit A (15), and the output end of the processing circuit A (15) is connected to the input end of the analog-to-digital converter (17); The output end of the control voltage measurement interface (14) is connected to the input end of the signal processing circuit B (16), and the output end of the signal processing circuit B (16) is connected to the input end of the analog-to-digital converter (17); The output end of the analog-to-digital converter (17) is connected to the input end of the ZYNQ controller (18); The input end of the digital isolator (19) is respectively connected to the output end of the command input module (112) and the ZYNQ controller (18); the output end of the digital isolator (19) is respectively connected to the input end of the command output module (113) and the ZYNQ controller (18); The ZYNQ controller (18) is connected to the SD card (110) and the network port (111).

2. A circuit breaker phase selection device according to claim 1, characterized in that: Preferably, the universal sensor interface (11) comprises a SF12-4 aviation socket for connecting six sensor signals of a coil current sensor, a stroke sensor, a temperature sensor, an air pressure sensor, an oil pressure sensor and a spring pressure sensor.

3. A circuit breaker phase selection device according to claim 1, characterized in that: The communication interface between the universal sensor interface (11) and the ZYNQ controller (18) is RS485, and the communication protocol is MODBUS-RTU.

4. A circuit breaker phase selection device as claimed in claim 1, characterized in that: The voltage transformer interface (12), the current transformer interface (13) and the control voltage measurement interface (14) all include SF10 aviation sockets for respectively connecting a three-phase voltage signal, a three-phase current signal and a control voltage signal.

5. A circuit breaker phase selection device as claimed in claim 1, characterized in that: The signal processing circuit A (15) includes an isolation amplifier and a precision operational amplifier.

6. A circuit breaker phase selection device as claimed in claim 1, characterized in that: The signal processing circuit B (16) comprises a voltage-dividing resistor for reducing the input signal to 5V, an isolation amplifier connected to the voltage-dividing resistor, and a precision operational amplifier.

7. A circuit breaker phase selection device as claimed in claim 1, characterized in that: The command input module (112) divides the voltage of the input command signal through a diode, and converts it into a logic level signal through an optical coupling element.

8. A circuit breaker phase selection device as claimed in claim 1, characterized in that: The command output module (113) converts the logic level signal into a 24V voltage signal through an optical coupling element, and then controls the solid-state relay through the 24V voltage signal to output a 220V phase selection control command.

9. A circuit breaker phase selection device as claimed in claim 1, characterized in that: The power supply system (10), signal processing circuit A (15), signal processing circuit B (16), digital-to-analog converter (17), ZYNQ controller (18), digital isolator (19), SD card (110) and network port (111) are all arranged on a circuit board, and the circuit board is provided with interfaces corresponding to the coil current sensor, the stroke sensor, the temperature sensor, the air pressure sensor, the oil pressure sensor, the spring pressure sensor, the voltage transformer, the current transformer, the control voltage signal, the command output module (113) and the command input module (112).

10. A method for arranging a phase selection device of a circuit breaker according to any one of claims 1 to 9.

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