A high-voltage circuit breaker state monitoring and fault diagnosis device

Abstract

This utility model relates to a high-voltage circuit breaker condition monitoring and fault diagnosis device, belonging to the field of intelligent maintenance and operation technology of power equipment. It includes a tripping and closing coil current detection module, an energy storage motor coil current detection circuit module, an arc monitoring circuit module, a laser displacement ranging circuit module, a partial discharge monitoring circuit module, a vibration monitoring circuit module, an MCU main control module, and a power supply module. It non-contactly collects the current signals of the tripping and closing coils and the energy storage motor using a magnetic balance Hall sensor; the laser displacement ranging module calculates the change in the moving contact stroke based on the reflected light intensity; the partial discharge detection module captures insulation degradation pulses; the vibration monitoring module analyzes the mechanical impact of tripping and closing; and the arc monitoring module detects arcing phenomena using an ultraviolet sensor. This enables mechanical condition diagnosis, insulation degradation early warning, and arc risk assessment, achieving circuit breaker-free, online monitoring, and predictive maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker maintenance technology, and specifically relates to a high-voltage circuit breaker condition monitoring and fault diagnosis device. Background Technology

[0002] High-voltage circuit breakers are characterized by their wide applicability, ability to be operated electrically and manually, measurable and customizable travel, reclosing and re-opening capabilities, convenient wiring, accurate data, strong anti-interference capabilities, small size and light weight, and strong time-delay protection. High-voltage circuit breakers also possess strong control and protection functions. When applied to power systems, they can effectively control the electrical equipment and lines throughout the system, and can even force the power system to shut down when necessary. For example, in the event of a major electrical equipment failure in the power system, the high-voltage circuit breaker will control the equipment to shut down and, in conjunction with other protection and automatic devices, quickly disconnect the fault, avoiding and reducing safety accidents caused by equipment failure. Therefore, high-voltage circuit breakers are one of the most important pieces of equipment in power systems; their performance is crucial to the stability of the power grid. Accurately monitoring and evaluating the mechanical characteristics of circuit breakers is essential for preventing faults and ensuring the safe operation of the power system.

[0003] The maintenance of high-voltage circuit breakers is divided into three methods: power-off maintenance, post-incident maintenance, and real-time online monitoring. Regarding functional timeliness, power-off offline maintenance and post-incident maintenance not only fail to meet functional requirements but also easily lead to major safety accidents. Online monitoring can immediately diagnose the performance of the high-voltage circuit breaker after it operates, report faults, and arrange maintenance, thus ensuring its reliability.

[0004] Existing online monitoring methods for circuit breakers mainly focus on monitoring the current of the circuit breaker's opening coil, closing coil, and energy storage motor coil. A few add linear displacement sensors to detect stroke changes. However, there is a lack of overall monitoring of the circuit breaker's overall operating status. As a result, the insulation degradation of the circuit breaker under heavy load, high temperature and high humidity environments cannot be detected in time, and only simple measurements are taken locally. Utility Model Content

[0005] In order to solve the problems existing in the prior art, this utility model proposes a high-voltage circuit breaker condition monitoring and fault diagnosis device, which can realize comprehensive monitoring of the overall working status and health status of the circuit breaker.

[0006] The technical solution of this utility model is as follows:

[0007] A high-voltage circuit breaker condition monitoring and fault diagnosis device includes a closing coil current detection circuit module, a tripping coil current detection circuit module, and an energy storage motor coil current detection circuit module. Its distinguishing feature is that it further includes an arc flash monitoring circuit module, a laser displacement ranging circuit module, a partial discharge monitoring circuit module, and a vibration monitoring circuit module.

[0008] Arc monitoring circuit module is used to detect the arc intensity at the moving contact connection of a high-voltage circuit breaker;

[0009] Laser displacement ranging circuit module is used to detect the change in travel distance of the moving contact of a high-voltage circuit breaker;

[0010] The partial discharge detection circuit module is used to monitor the insulation degradation process of the circuit breaker under high voltage operation.

[0011] The vibration monitoring circuit module is used to detect the vibration signals and transient waveforms generated by the circuit breaker's opening and closing operations at different time periods;

[0012] The closing coil current detection circuit module, the opening coil current detection circuit module, the energy storage motor coil current detection module, the arc monitoring circuit module, the laser displacement ranging circuit module, the partial discharge detection circuit module, and the vibration monitoring circuit module are respectively connected to the MCU main control circuit module. The MCU main control circuit module realizes the signal processing and control output of the entire circuit.

[0013] Optionally, the closing coil current detection circuit module, the opening coil current detection circuit module, and the energy storage motor coil current detection circuit module all employ Hall current sensors to detect current changes during the closing, opening, and energy storage processes, respectively. Each of these circuit modules includes a Hall current sensor HG, a voltage regulator R, an operational amplifier U, a filter capacitor C, and a power supply voltage filter capacitor. and the first load resistor, the second load resistor, and the third load resistor; wherein,

[0014] The Hall current sensor HG has the closing coil current, opening coil current, or energy storage motor coil current inserted into one side, and the two terminals on the other side are grounded at one end and connected to one end of the voltage regulator resistor at the other end.

[0015] The other end of the voltage regulator resistor R is connected to port 3 of the operational amplifier U through the first load resistor; port 8 of the operational amplifier U is connected to the positive terminal of the power supply, and port 4 is grounded; one end of the third load resistor is connected to port 2 of the operational amplifier U, and the other end is connected to port 1 of the operational amplifier U, forming negative feedback; port 1 of the operational amplifier U is connected to the subsequent circuit through the second load resistor.

[0016] By adopting the above technical solutions, the current detection methods for the tripping coil, closing coil, and energy storage motor have been optimized, solving problems such as low current detection accuracy and poor waveform recording accuracy caused by short circuit breaker operating time. This allows for more rapid and efficient acquisition of parameter changes during the circuit breaker's operation.

[0017] Optionally, the laser source emitting circuit includes resistors R17, R18, and R24, capacitor C12, operational amplifier U6, transistor Q2, and laser source sensor J1; the source receiving circuit includes resistors R20, R21, R22, and R23, phototransistor D1, and transistor Q1; wherein,

[0018] The laser displacement ranging circuit includes a laser source generating circuit and a source receiving circuit. The laser source generating circuit generates laser light, which is then reflected back after being emitted externally. The source receiving circuit calculates the intensity of the received light source.

[0019] The signal input terminal is connected to the input terminal of operational amplifier U6 through a resistor-capacitor filter network composed of resistors R17, R18, R24 and capacitor C12. Operational amplifier U6 amplifies the filtered signal and outputs it to laser source sensor J1 to control laser emission.

[0020] After the laser signal is received by the phototransistor, it is amplified by the current gain through the amplifier circuit composed of transistor Q1 and resistors R20, R21, R22, and R23, and finally outputs a displacement signal.

[0021] By adopting the above technical solution, accurate distance measurement can be achieved without changing the mechanical structure of the circuit breaker.

[0022] Optionally, the local monitoring circuit module includes an onboard antenna J2, filter capacitors C20, C21, C25, and C31, a DC blocking capacitor C22, operational amplifiers U9 and U10, voltage divider resistors R32, R33, and R36, LC filter inductors L2 and L3, Π-type LC filter capacitors C26 and C27, Π-type LC filter inductor L1, ground-stabilizing resistors R35 and R34, bias filter capacitors C23 and C29, power supply filter capacitor C24, and a unidirectional conducting diode D2; wherein,

[0023] The onboard antenna J2 is used to absorb the discharge pulse voltage signal conducted on the metal surface due to partial discharge interference.

[0024] The secondary LC filter circuit is composed of filter capacitor C20 and filter inductor L2, and filter capacitor C21 and filter inductor L3.

[0025] The π-type LC filter is composed of Π-type LC filter capacitors C26 and C27 and Π-type LC filter inductor L1;

[0026] The VCC in the secondary amplifier is fed into the enable terminal (port 6) of operational amplifier U9 via voltage divider resistor R36. One end of R36 is connected to the slider of variable resistor R32, and the other end is connected to the positive terminal of the power supply. Voltage divider resistor R33 is connected to R32 at one end and grounded at the other end, forming a voltage divider circuit. Bias filter capacitor C23 is connected to port 1 of operational amplifier U9 at one end and grounded at the other end. Bias filter capacitor C29 is connected to port 3 of operational amplifier U9 at one end and grounded at the other end, used for bias filtering. The discharge pulse voltage signal is amplified and then input to the operational amplifier. The voltage regulator R34 at port 3 of amplifier U10 is connected to port 3 of operational amplifier U10 at one end and grounded at the other end to ensure stable signal voltage. The power supply filter capacitor C24 is connected to port 5 of operational amplifier U10 at one end and grounded at the other end to make its operating voltage more stable. The signal input terminal of the single-phase conducting diode D2 is connected to port 1 of the signal output terminal of operational amplifier U10 for outputting a positive half-wave signal. The filter capacitor C31 and the voltage regulator R35 are grounded at one end and connected to port 3 of the single-phase conducting diode D2 at the other end.

[0027] By adopting the above technical solution, the problem of partial discharge that cannot be monitored due to unreasonable operation of the moving contact of the existing circuit breaker or excessive load is solved, which causes faults such as creepage and breakdown of the circuit breaker. This helps maintenance personnel to understand the insulation degradation process of the circuit breaker in advance.

[0028] Optionally, the vibration monitoring circuit module includes: a digital displacement vibration sensor U18, pull-up resistors R2, R3, R4, R5, and power supply voltage filter capacitors C2 and C3;

[0029] Port 1 and port 11 of the digital displacement vibration sensor U18 are both connected to a power source to power the internal components of the digital displacement vibration sensor U18.

[0030] Power supply voltage filter capacitors C2 and C3 are connected in parallel between the positive power supply and the ground terminal;

[0031] Ports 3, 8, 6, 12, and 4 of the digital displacement vibration sensor U18 are all connected to the ground terminal;

[0032] One end of the pull-up resistor R2 is connected to the power supply, and the other end is connected to port 5 of the digital displacement vibration sensor U18; one end of the pull-up resistor R3 is connected to the power supply, and the other end is connected to port 7 of the digital displacement vibration sensor U18; one end of the pull-up resistor R4 is connected to the power supply, and the other end is connected to port 9 of the digital displacement vibration sensor U18; one end of the pull-up resistor R5 is connected to the power supply, and the other end is connected to port 10 of the digital displacement vibration sensor U18; port 9 of the digital displacement vibration sensor U18 is connected to an external communication line; port 10 of the digital displacement vibration sensor U18 is connected to an external communication line.

[0033] By adopting the above technical solution, the problem of not being able to understand the changes in mechanical characteristics caused by repeated operation of existing circuit breakers during years of operation is solved. This effectively allows maintenance personnel to understand the healthy operating status of the circuit breaker, which is beneficial for maintaining the circuit breaker itself.

[0034] Optionally, the arc monitoring circuit module includes: an ultraviolet sensor PD1, an operational amplifier U7, a current-limiting resistor R25, a pull-up resistor R26, and a capacitor C16; wherein,

[0035] The signal output terminal of the ultraviolet sensor PD1 is connected to one end of the pull-up resistor R26, one end of the capacitor C16, and port 4 of the operational amplifier U7, respectively. The other end of the ultraviolet sensor PD1 is grounded, and the resistor R26 and the capacitor C16 are connected in parallel.

[0036] One end of the resistor R25 is connected to port 1 of the operational amplifier U7, and the other end is connected to the subsequent circuit.

[0037] Ports 2 and 3 of the operational amplifier U7 are grounded, and port 5 is connected to the power supply.

[0038] By adopting the above technical solution, the problem of existing devices not being able to detect electric arcs is solved. It can effectively detect electric arc phenomena caused by partial discharge, heavy load, abnormal movement of moving contacts, etc., in advance, and understand potential equipment problems as early as possible.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. This utility model proposes a high-voltage circuit breaker condition monitoring and fault diagnosis device. By adding a partial discharge monitoring circuit module, an arc flash monitoring circuit module, and a vibration monitoring circuit module, and optimizing the laser displacement ranging circuit module, and combining it with the opening, closing, and energy storage motor coil current detection circuit modules, it provides multiple bases for diagnosing the overall health status of the circuit breaker. It adds multiple detection methods and reliability verification means to the overall circuit breaker system, making the long-term use of the circuit breaker more reliable and improving the power supply reliability of the switchgear.

[0041] 2. This utility model adds a vibration monitoring circuit module for the circuit breaker during opening, closing, or energy storage processes, which solves the problem that existing circuit breakers cannot promptly understand the changes in mechanical characteristics caused by repeated operations during years of operation. This effectively allows maintenance personnel to understand the healthy operating status of the circuit breaker, which is beneficial for maintaining the circuit breaker itself.

[0042] 3. This utility model adds an arc monitoring circuit module, which supplements the arc detection function and solves the problem that the existing device does not have the ability to detect arcs. It can effectively detect arc phenomena caused by partial discharge, heavy load, abnormal movement of moving contacts, etc. in advance, and understand the potential problems of the equipment as early as possible.

[0043] 4. This utility model adds vibration monitoring of the circuit breaker during opening, closing or energy storage, which solves the problem that the changes in mechanical characteristics caused by multiple operations of the existing circuit breaker during years of operation cannot be understood in a timely manner. It effectively allows operation and maintenance personnel to understand the healthy operating status of the circuit breaker, which is beneficial to the maintenance of the circuit breaker body.

[0044] 5. This utility model improves the method of detecting the travel of the moving contact of the circuit breaker, and solves the problems of primary insulation hazards and space limitations caused by the addition and modification of the circuit breaker body due to the use of linear or angular displacement travel sensors in the existing market. It provides convenient and efficient measurement of travel changes, is applicable to circuit breakers of various structures, and has high adaptability.

[0045] 6. This utility model adopts a Hall current sensor, which improves the detection method of current in the opening, closing and energy storage motor coils, and solves the problems of low current detection accuracy and poor waveform recording accuracy caused by short circuit breaker action time, so as to collect parameter changes during the circuit breaker action process more quickly and efficiently. Attached Figure Description

[0046] Figure 1 This is a structural block diagram of a high-voltage circuit breaker condition monitoring and fault diagnosis device according to the present invention;

[0047] Figure 2 This is a schematic diagram of the power conversion circuit module according to an embodiment of the present invention;

[0048] Figure 3 This is a schematic diagram of the closing coil current detection circuit module according to an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the circuit module for detecting the current of the trip coil in an embodiment of this utility model.

[0050] Figure 5 This is a schematic diagram of the energy storage motor coil current detection circuit module according to an embodiment of the present invention;

[0051] Figure 6This is a schematic diagram of the power conversion circuit module according to an embodiment of the present invention;

[0052] Figure 7 This is a schematic diagram of the laser ranging circuit module according to an embodiment of the present invention;

[0053] Figure 8 This is a schematic diagram of the partial discharge monitoring circuit module according to an embodiment of the present invention;

[0054] Figure 9 This is a schematic diagram of the vibration monitoring circuit module according to an embodiment of the present invention. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0056] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

[0057] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0058] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0059] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0060] Reference Figure 1 This utility model discloses a high-voltage circuit breaker condition monitoring and fault diagnosis device, including a tripping coil current detection circuit module, a closing coil current detection circuit module, an energy storage motor coil current detection circuit module, a power supply circuit module, a vibration monitoring circuit module, a laser displacement ranging circuit module, an arc monitoring circuit module, a partial discharge monitoring circuit module, a power supply module, and an MCU main control circuit module; wherein,

[0061] The trip coil current detection circuit module is used to detect the current change of the circuit breaker during the tripping process; the closing coil current detection circuit module is used to detect the current change of the circuit breaker during the closing process; the energy storage motor coil current detection circuit module is used to detect the current change of the circuit breaker during the energy storage process.

[0062] Power supply circuit module: used for level conversion of system circuits, converting voltage into the voltage value required by different chips;

[0063] Arc monitoring circuit module is used to detect the arc intensity at the moving contact connection of high voltage circuit breaker, especially the damage intensity of arcing inside the circuit breaker to the insulation of the circuit breaker body;

[0064] Laser displacement ranging circuit module is used to detect the change in travel distance of the moving contact of a high-voltage circuit breaker;

[0065] Partial discharge detection circuit module is used to monitor the insulation degradation process of circuit breakers under high voltage operation.

[0066] The vibration monitoring circuit module is used to detect the vibration signals and transient waveforms generated by the opening and closing operations of the high-voltage circuit breaker at different time periods.

[0067] This embodiment adds a partial discharge monitoring circuit module and an arc flash monitoring circuit module to assist in the insulation monitoring of the circuit breaker, thereby improving the detection basis for the safe operation of the circuit breaker. It also adds a vibration monitoring circuit module to monitor the vibration intensity during the operation of the circuit breaker's moving contact, allowing maintenance personnel to understand the changes in the circuit breaker's operating characteristics at different times, which is beneficial for maintenance personnel to understand the usage status of the circuit breaker.

[0068] By combining or optimizing the above-mentioned multiple detection methods, and integrating them with the detection of the circuit breaker's own tripping coil current, closing coil current, and energy storage motor coil current, multiple bases are provided for diagnosing the overall health status of the circuit breaker. Compared with existing technologies, this approach adds multiple detection methods and reliability verification means to the overall circuit breaker system, making the long-term use of the circuit breaker more reliable and improving the power supply reliability of the switchgear.

[0069] Reference Figure 2 As one implementation of the power supply circuit module, it includes an input fuse F1 to prevent overcurrent or short circuit; a varistor R1 for lightning protection; an AC-DC power module U4 that can convert AC220V to DC5V output; 5V output voltage filter capacitors C9 and C7; an LDO U3 that can step down the 5V voltage to the system's required 3.3V voltage; and output voltage filter capacitors C8 and C10.

[0070] Reference Figure 3As one implementation of the closing coil current detection circuit module, it includes a Hall current sensor HG1, a voltage regulator resistor R1, an operational amplifier U1, a filter capacitor C1, a power supply voltage filter capacitor C4, a first load resistor R6, a second load resistor R7, and a third load resistor R8; wherein,

[0071] The Hall current sensor HG1 has a closing coil current passing through one side, and the other two segments are connected to one end of the ground and the other end of the voltage regulator R1.

[0072] The other end of the voltage regulator resistor R1 is connected to port 3 of the operational amplifier U1 through the first load resistor R6; port 8 of the operational amplifier U1 is connected to the positive terminal of the power supply, and port 4 is grounded; one end of the third load resistor R8 is connected to port 2 of the operational amplifier U1, and the other end is connected to port 1 of the operational amplifier U1 to form negative feedback; port 1 of the operational amplifier U1 is connected to the subsequent circuit through the second load resistor R7.

[0073] In the above implementation of the closing coil current detection circuit module, the Hall current sensor HG1, with a range of 0-5A and an accuracy of 1%, is installed in an open manner on the power cable of the circuit breaker closing coil. It can accurately collect the changes in the magnitude of the closing coil current, and its current value is an AC signal. The voltage regulating resistor R1 converts the AC current value detected by HG1 into a small-signal AC voltage value, which is then input to U1 for amplification. U1 is an operational amplifier, which, through R6 and R8, can form a first-stage signal amplification circuit with a gain of 1 + R8 / R6 = 6 times, amplifying the voltage signal by 6 times. R7 and C1 form an RC filter circuit to prevent the front-end amplified signal from being too large and damaging the MCU port at the back end. C4 is the power supply voltage filter capacitor of U1, which makes the power supply voltage more stable. Finally, the collected and amplified signal is input to the MCU port 46.

[0074] Reference Figure 4 As one implementation of the trip coil current detection circuit module, it includes a Hall current sensor HG2, a voltage regulator resistor R9, an operational amplifier U2, a filter capacitor C5, a power supply voltage filter capacitor C6, a first load resistor R10, a second load resistor R11, and a third load resistor R12; wherein,

[0075] The Hall current sensor HG2 has a trip coil current passing through one side, and the other two segments are connected to one end of the ground and the other end of the voltage regulator R9.

[0076] The other end of the voltage regulator resistor R9 is connected to port 3 of the operational amplifier U2 through the first load resistor R6; port 8 of the operational amplifier U2 is connected to the positive terminal of the power supply, and port 4 is grounded; one end of the third load resistor R12 is connected to port 2 of the operational amplifier U2, and the other end is connected to port 1 of the operational amplifier U2 to form negative feedback; port 1 of the operational amplifier U2 is connected to the subsequent circuit through the second load resistor R11.

[0077] In the above implementation of the trip coil current detection circuit module, the Hall current sensor HG2, with a range of 0-5A and an accuracy of 1%, is installed in an open manner on the circuit breaker trip coil power cable. It can accurately collect changes in the magnitude of the trip coil current, and its current value is an AC signal. The voltage regulating resistor R9 converts the AC current value detected by HG2 into a small-signal AC voltage value, which is then input to U2 for amplification. U2 is an operational amplifier, and through R10 and R12, it can form a first-stage signal amplification circuit with a gain of 1 + R12 / R10 = 6 times, which can amplify the voltage signal by 6 times. R11 and C5 form an RC filter circuit to prevent the front-end amplified signal from being too large and damaging the MCU transistor port at the back end. C6 is the power supply voltage filter capacitor of U2, which makes the power supply voltage more stable. Finally, the collected and amplified signal is input to the MCU port 45.

[0078] Reference Figure 5 As one implementation of the energy storage motor coil current detection circuit module, it includes a Hall current sensor HG3, a voltage regulator resistor R14, an operational amplifier U5, a filter capacitor C11, a power supply voltage filter capacitor C13, a first load resistor R15, a second load resistor R16, and a third load resistor R19; wherein,

[0079] The Hall current sensor HG3 has the energy storage motor coil current inserted into one side, and the other two segments are connected to one end of the ground and the other end of the voltage regulator resistor R14.

[0080] The other end of the voltage regulator resistor R14 is connected to port 3 of the operational amplifier U5 through the first load resistor R15; port 8 of the operational amplifier U5 is connected to the positive terminal of the power supply, and port 4 is grounded; one end of the third load resistor R19 is connected to port 2 of the operational amplifier U5, and the other end is connected to port 1 of the operational amplifier U5 to form negative feedback; port 1 of the operational amplifier U5 is connected to the subsequent circuit through the second load resistor R16.

[0081] In the above implementation of the energy storage motor coil current detection circuit module, the Hall current sensor HG3, with a range of 0-5A and an accuracy of 1%, is installed in an open manner on the power cable of the energy storage motor coil in the circuit breaker. It can accurately collect the changes in the magnitude of the energy storage motor coil current, and its current value is an AC signal. The voltage regulating resistor R14 can convert the AC current value detected by HG3 into a small signal AC voltage value, which is then input to U5 for amplification. U5 is an operational amplifier, which, through R19 and R15, can form a first-stage signal amplification circuit with a magnification factor of 1 + R19 / R15 = 6 times, amplifying the voltage signal by 6 times. R16 and C11 form an RC filter circuit to prevent the front-end amplified signal from being too large and damaging the MCU transistor port at the back end. C13 is the power supply voltage filter capacitor of U5, which can make the power supply voltage more stable. Finally, the collected and amplified signal is input to the MCU port 44.

[0082] join Figure 6 As one implementation of a laser displacement ranging circuit, its laser source emitting circuit includes resistors R17, R18, and R24, capacitor C12, operational amplifier U6, transistor Q2, and laser source sensor J1; the source receiving circuit includes resistors R20, R21, R22, and R23, phototransistor D1, and transistor Q1; wherein,

[0083] The laser displacement ranging circuit includes a laser source generating circuit and a source receiving circuit. The laser source generating circuit generates laser light, which is then reflected back after being emitted externally. The source receiving circuit calculates the intensity of the received light source.

[0084] The signal input terminal is connected to the input terminal of operational amplifier U6 through a resistor-capacitor filter network composed of resistors R17, R18, R24 and capacitor C12. Operational amplifier U6 amplifies the filtered signal and outputs it to laser source sensor J1 to control laser emission.

[0085] After the laser signal is received by the phototransistor, it is amplified by the current gain through the amplifier circuit composed of transistor Q1 and resistors R20, R21, R22, and R23, and finally outputs a displacement signal.

[0086] Laser source emitting circuit: FBXH_KZ is the light source start / stop control signal. R24 is the base resistor of transistor Q2. When FBXH_KZ=1, the base current generated through R24 drives transistor Q2 to conduct, grounding port 4 of U6, thus enabling U6 to function as an amplifier chip. U6 is an operational amplifier chip; through R17 and R18, it forms a first-stage signal amplification circuit with a gain of 1 + R17 / R18 = 4.92 times, amplifying the signal by 4.92 times. FBXH is a square wave signal input, generated by MCU U8. J1 is the laser source sensor; when a square wave signal is input, it emits a laser signal.

[0087] Laser source receiving circuit: D1 is a phototransistor that receives the laser intensity signal generated by the laser source sensor. After the laser source illuminates the circuit connected to D1, it measures the change in the GMJS voltage, which is then input to the MCU U8 to calculate the displacement distance. R20 and R23 form a current-limiting resistor. Q1 is a transistor; when D1 changes, the conduction voltage of Q1 also changes, causing the GMJS voltage value to change accordingly. R21 is a current-limiting resistor to prevent the 3.3V voltage from directly short-circuiting to ground. R22 is a current-limiting resistor to prevent excessive current from damaging the MCU U8.

[0088] Reference Figure 7 As one implementation of the partial discharge monitoring circuit module, the partial discharge monitoring circuit module includes an onboard antenna J2, filter capacitors C20, C21, C25, and C31, a DC blocking capacitor C22, operational amplifiers U9 and U10, voltage divider resistors R32, R33, and R36, LC filter inductors L2 and L3, Π-type LC filter capacitors C26 and C27, Π-type LC filter inductor L1, ground-stabilizing resistors R35 and R34, bias filter capacitors C23 and C29, power supply filter capacitor C24, and a unidirectional conducting diode D2; wherein,

[0089] The VCC in the secondary amplifier is fed into the enable terminal (port 6) of operational amplifier U9 via voltage divider resistor R36. One end of R36 is connected to the slider of variable resistor R32, and the other end is connected to the positive terminal of the power supply. Voltage divider resistor R33 is connected to R32 at one end and grounded at the other end, forming a voltage divider circuit. Bias filter capacitor C23 is connected to port 1 of operational amplifier U9 at one end and grounded at the other end. Bias filter capacitor C29 is connected to port 3 of operational amplifier U9 at one end and grounded at the other end, used for bias filtering. The discharge pulse voltage signal is amplified and then input to the operational amplifier. The voltage regulator R34 at port 3 of amplifier U10 is connected to port 3 of operational amplifier U10 at one end and grounded at the other end to ensure stable signal voltage. The power supply filter capacitor C24 is connected to port 5 of operational amplifier U10 at one end and grounded at the other end to make its operating voltage more stable. The signal input terminal of the single-phase conducting diode D2 is connected to port 1 of the signal output terminal of operational amplifier U10 for outputting a positive half-wave signal. The filter capacitor C31 and the voltage regulator R35 are grounded at one end and connected to port 3 of the single-phase conducting diode D2 at the other end.

[0090] J2 is an onboard antenna used to absorb the discharge pulse voltage signal conducted on the metal surface due to partial discharge interference. C25 is a filter capacitor, ensuring that the discharge pulse voltage signal is transmitted constantly in AC mode. C20 and L2, and C21 and L3 form a two-stage LC filter circuit, allowing the actual discharge pulse voltage signal to be transmitted to the back end while filtering out other noise signals. C26, L1, and C27 form a π-type LC filter to filter out noise interference in the circuit. C22 is a DC blocking capacitor, filtering out the DC component in the discharge pulse voltage signal.

[0091] U9 is an operational amplifier. VCC is input as a high-level signal to port 6 of U9 via R36, ensuring normal operation. C32 is a filter capacitor. R36, R32, and R33 form a voltage divider circuit, where the voltage input to port 5 of U9 is (R32+R33) / (R32+R33+R36)*VCC, serving as the DC bias voltage for U9. C23 and C29 are bias filter capacitors for U9, a fixed configuration for the chip. The discharge pulse voltage signal is amplified and input to port 3 of U10. R34 is a voltage regulator resistor to ground, ensuring signal voltage stability. C24 is a power supply filter capacitor for U10, further stabilizing its operating voltage. R28 and R311 form an amplifier circuit with a gain of 1 + R28 / R31 = 8.5, amplifying the signal by 8.5 times. D2 is a single-phase conducting diode used to output a positive half-wave signal. C31 is a filter capacitor, and R35 is a voltage regulator resistor to ground, to prevent excessive front-end pulse signals from damaging the back-end circuitry. Finally, the signal is connected to port 22 of the MCU U8 via JFJC.

[0092] Reference Figure 8 As one implementation of the vibration monitoring circuit module, the vibration monitoring circuit module includes a digital displacement vibration sensor U18, pull-up resistors R2, R3, R4, and R5, and power supply voltage filter capacitors C2 and C3; wherein,

[0093] Port 1 and port 11 of the digital displacement vibration sensor U18 are both connected to a power source to power the internal components of the digital displacement vibration sensor U18.

[0094] Power supply voltage filter capacitors C2 and C3 are connected in parallel between the positive power supply and the ground terminal;

[0095] Ports 3, 8, 6, 12, and 4 of the digital displacement vibration sensor U18 are all connected to the ground terminal;

[0096] One end of the pull-up resistor R2 is connected to the power supply, and the other end is connected to port 5 of the digital displacement vibration sensor U18; one end of the pull-up resistor R3 is connected to the power supply, and the other end is connected to port 7 of the digital displacement vibration sensor U18; one end of the pull-up resistor R4 is connected to the power supply, and the other end is connected to port 9 of the digital displacement vibration sensor U18; one end of the pull-up resistor R5 is connected to the power supply, and the other end is connected to port 10 of the digital displacement vibration sensor U18; port 9 of the digital displacement vibration sensor U18 is connected to an external communication line; port 10 of the digital displacement vibration sensor U18 is connected to an external communication line.

[0097] In the above implementation of the vibration monitoring circuit module, the digital displacement vibration sensor U18 can effectively measure acceleration parameters in various directions. R2, R3, R4, and R5 are pull-up resistors for ports 5, 7, 9, and 10 of U18, respectively, increasing the driving capability of the IO ports. IO_XSHUT, IO_GPIO1, IO_SDA, and IO_SCL are connected to the corresponding IO ports of U8 to realize data communication and transmission. The power supply voltage filter capacitors C2 and C3 of U18 make the operating voltage of U18 more stable.

[0098] Reference Figure 9 As one implementation of the arc light monitoring circuit module, the arc light monitoring circuit module includes an ultraviolet sensor PD1, an operational amplifier U7, a current-limiting resistor R25, a pull-up resistor R26, and a capacitor C16; wherein,

[0099] The signal output terminal of the ultraviolet sensor PD1 is connected to one end of the pull-up resistor R26, one end of the capacitor C15, and port 4 of the operational amplifier U7, respectively. The other end of the ultraviolet sensor PD1 is grounded, and the resistor R26 and the capacitor C16 are connected in parallel.

[0100] One end of the resistor R25 is connected to port 1 of the operational amplifier U7, and the other end is connected to the subsequent circuit.

[0101] Ports 2 and 3 of the operational amplifier U7 are grounded, and port 5 is connected to the power supply.

[0102] In the above implementation of the arc monitoring circuit module, the ultraviolet sensor PD1 is mainly used to detect the intensity of ultraviolet radiation in the air when an arc is generated. When there is arc ultraviolet radiation, PD1 will generate impedance, forming an amplifier circuit with R26, resulting in an amplified signal output to port 1 of U7, where U7 is an operational amplifier. R25 is a current-limiting resistor to prevent excessive front-end signal from damaging the back-end circuit.

[0103] In this embodiment of the invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0104] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high-voltage circuit breaker condition monitoring and fault diagnosis device, comprising a closing coil current detection circuit module, a tripping coil current detection circuit module, an energy storage motor coil current detection circuit module, and a power supply circuit module, characterized in that: It also includes an arc monitoring circuit module, a laser displacement ranging circuit module, a partial discharge monitoring circuit module, and a vibration monitoring circuit module; among which, Arc monitoring circuit module is used to detect the arc intensity at the moving contact connection of a high-voltage circuit breaker; Laser displacement ranging circuit module is used to detect the change in travel distance of the moving contact of a high-voltage circuit breaker; The partial discharge monitoring circuit module is used to monitor the insulation degradation process of the circuit breaker under high voltage operation. The vibration monitoring circuit module is used to detect the vibration signals and transient waveforms generated by the opening and closing operations of the high-voltage circuit breaker at different time periods. The closing coil current detection circuit module, opening coil current detection circuit module, energy storage motor coil current detection module, power supply circuit module, arc monitoring circuit module, laser displacement ranging circuit module, partial discharge detection circuit module, and vibration monitoring circuit module are respectively connected to the MCU main control circuit module. The MCU main control circuit module realizes the signal processing and control output of the entire circuit.

2. The high voltage circuit breaker condition monitoring and fault diagnostic device of claim 1, wherein: The closing coil current detection circuit module, the opening coil current detection circuit module, and the energy storage motor coil current detection circuit module all use Hall current sensors to detect current changes during the closing, opening, and energy storage processes, respectively. Each of these circuit modules includes a Hall current sensor HG, a voltage regulator R, an operational amplifier U, a filter capacitor C, and a power supply voltage filter capacitor. and the first load resistor, the second load resistor, and the third load resistor; wherein, The Hall current sensor HG has one side inserted with the closing coil current, opening coil current, or energy storage motor coil current, and two terminals led out from the other side, one end of which is grounded and the other end is connected to one end of a voltage regulator resistor. The other end of the voltage regulator R is connected to port 3 of the operational amplifier U through the first load resistor; port 8 of the operational amplifier U is connected to the positive terminal of the power supply, and port 4 is grounded; one end of the third load resistor is connected to port 2 of the operational amplifier U, and the other end is connected to port 1 of the operational amplifier U, forming negative feedback; port 1 of the operational amplifier U is connected to the subsequent circuit through the second load resistor.

3. The high voltage circuit breaker condition monitoring and fault diagnostic device of claim 1, wherein: The laser displacement ranging circuit includes a laser source generating circuit and a source receiving circuit. The laser source generating circuit generates laser light, which is then reflected back after being emitted externally. The source receiving circuit calculates the intensity of the received light source.

4. The high voltage circuit breaker condition monitoring and fault diagnostic device of claim 3, wherein: The laser source emitting circuit includes resistors R17, R18, and R24, capacitor C12, operational amplifier U6, transistor Q2, and laser source sensor J1; the source receiving circuit includes resistors R20, R21, R22, and R23, phototransistor D1, and transistor Q1; wherein... The signal input terminal is connected to the input terminal of operational amplifier U6 through a resistor-capacitor filter network composed of resistors R17, R18, R24 and capacitor C12. Operational amplifier U6 amplifies the filtered signal and outputs it to laser source sensor J1 to control laser emission. After the laser signal is received by the phototransistor, it is amplified by the current gain through the amplifier circuit composed of transistor Q1 and resistors R20, R21, R22, and R23, and finally output as a displacement signal.

5. The high voltage circuit breaker condition monitoring and fault diagnostic device of claim 1, wherein: The partial discharge monitoring circuit module includes an onboard antenna J2, filter capacitors C20, C21, C25, and C31, a DC blocking capacitor C22, operational amplifiers U9 and U10, voltage divider resistors R32, R33, and R36, LC filter inductors L2 and L3, Π-type LC filter capacitors C26 and C27, Π-type LC filter inductor L1, ground-stabilizing resistors R35 and R34, bias filter capacitors C23 and C29, power supply filter capacitor C24, and a unidirectional conducting diode D2. The onboard antenna J2 is used to absorb the discharge pulse voltage signal conducted on the metal surface due to partial discharge interference. The two-stage LC filter circuit consists of filter capacitor C20 and filter inductor L2, and filter capacitor C21 and filter inductor L3. The π-type LC filter consists of π-type LC filter capacitors C26 and C27 and π-type LC filter inductor L1; The VCC signal from the secondary amplifier is input as a high-level signal to the enable terminal 6 of operational amplifier U9 via voltage divider resistor R36. One end of R36 is connected to the slider of variable resistor R32, and the other end is connected to the positive terminal of the power supply. One end of voltage divider resistor R33 is connected to R32, and the other end is grounded, forming a voltage divider circuit. One end of bias filter capacitor C23 is connected to port 1 of operational amplifier U9, and the other end is grounded. One end of bias filter capacitor C29 is connected to port 3 of operational amplifier U9, and the other end is grounded, used for bias filtering. The discharge pulse voltage signal is amplified and then input to the operational amplifier. The 3-port of the amplifier U10 is connected to the ground via a voltage regulator resistor R34. One end of the resistor is connected to the 3-port of the operational amplifier U10, and the other end is grounded to ensure stable signal voltage. One end of the power supply filter capacitor C24 is connected to the 5-port of the operational amplifier U10, and the other end is grounded to make its operating voltage more stable. The signal input terminal of the unidirectional diode D2 is connected to the signal output terminal 1 of the operational amplifier U10 to output a positive half-wave signal. The filter capacitor C31 and the voltage regulator resistor R35 are both grounded at one end, and the other end is connected to the 3-port of the unidirectional diode D2.

6. The high voltage circuit breaker condition monitoring and fault diagnostic device of claim 1, wherein: The vibration monitoring circuit module includes: a digital displacement vibration sensor U18, pull-up resistors R2, R3, R4, R5, and power supply voltage filter capacitors C2 and C3; Port 1 and port 11 of the digital displacement vibration sensor U18 are both connected to a power source to power the internal components of the digital displacement vibration sensor U18. Power supply voltage filter capacitors C2 and C3 are connected in parallel between the positive power supply and the ground terminal; Ports 3, 8, 6, 12, and 4 of the digital displacement vibration sensor U18 are all connected to the ground terminal; One end of the pull-up resistor R2 is connected to the power supply, and the other end is connected to port 5 of the digital displacement vibration sensor U18; one end of the pull-up resistor R3 is connected to the power supply, and the other end is connected to port 7 of the digital displacement vibration sensor U18; one end of the pull-up resistor R4 is connected to the power supply, and the other end is connected to port 9 of the digital displacement vibration sensor U18; one end of the pull-up resistor R5 is connected to the power supply, and the other end is connected to port 10 of the digital displacement vibration sensor U18; port 9 of the digital displacement vibration sensor U18 is connected to an external communication line; port 10 of the digital displacement vibration sensor U18 is connected to an external communication line.

7. The high voltage circuit breaker condition monitoring and fault diagnostic device of claim 1, wherein: The arc monitoring circuit module includes: an ultraviolet sensor PD1, an operational amplifier U7, a current-limiting resistor R25, a pull-up resistor R26, and a capacitor C16; wherein... The signal output terminal of the ultraviolet sensor PD1 is connected to one end of the pull-up resistor R26, one end of the capacitor C16, and port 4 of the operational amplifier U7, respectively. The other end of the ultraviolet sensor PD1 is grounded, and the resistor R26 and the capacitor C16 are connected in parallel. One end of the resistor R25 is connected to port 1 of the operational amplifier U7, and the other end is connected to the subsequent circuit. Ports 2 and 3 of the operational amplifier U7 are grounded, and port 5 is connected to the power supply.

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