Mobile test device for characteristic test of high-voltage circuit breaker

Abstract

A mobile test device for a high-voltage circuit breaker characteristic test comprises a vehicle body platform with pulleys, a circuit breaker characteristic tester and a pre-wiring module, the circuit breaker characteristic tester is arranged on the vehicle body platform, the pre-wiring module is arranged on the vehicle body platform, and a pluggable terminal strip is installed on the pre-wiring module; an opening and closing control line of the circuit breaker characteristic tester is permanently connected to one side of the pluggable terminal row in advance; the other side of the pluggable terminal strip is used for being detachably connected with various circuit breaker secondary plug modules; the circuit breaker secondary plug module is used for being inserted into a secondary socket of a high-voltage circuit breaker, so that field wiring operation is avoided fundamentally, and the risk of wrong wiring is eliminated.

Description

Technical Field

[0001] This invention relates to a mobile testing device for high-voltage circuit breaker characteristic testing, belonging to the technical field of high-voltage circuit breaker characteristic testing. Background Technology

[0002] In the maintenance of power companies, substations, and power distribution rooms for large electrical equipment, conducting mechanical characteristic tests on high-voltage circuit breakers is a crucial step. The currently common testing method involves the following steps: Test personnel must bring a circuit breaker characteristic tester to the site, locate the terminal blocks of the high-voltage switchgear, identify and disconnect the connection lines between the opening and closing coils and the protection devices according to the secondary wiring diagram, wrap the exposed ends with insulating tape, connect the tester's leads to the terminal blocks, and simultaneously install a ground wire on the circuit breaker body before conducting the test. After the test is completed, all temporary modifications to the secondary wiring must be restored.

[0003] This traditional method has significant drawbacks: 1. Directly altering the secondary circuit wiring can easily lead to malfunctions in protection devices, equipment damage, or even personal injury accidents due to incorrect wiring. 2. The process of disconnecting, connecting, checking diagrams, and verifying is cumbersome, with preparation time for testing a single circuit breaker exceeding 30 minutes, which is time-consuming and labor-intensive. 3. Repeatedly tightening terminal block screws can easily cause stripping and loosening of wiring, affecting the long-term operational reliability of the equipment. 4. The entire process is highly dependent on the experience and skill level of the testing personnel, resulting in a low tolerance for error. Summary of the Invention

[0004] To address the aforementioned problems in the existing technology, this invention provides a mobile testing device for high-voltage circuit breaker characteristic testing, fundamentally avoiding on-site wiring operations and eliminating the risk of incorrect wiring.

[0005] A mobile testing device for high-voltage circuit breaker characteristic testing includes a vehicle platform with pulleys, a circuit breaker characteristic tester, and a pre-wiring module. The circuit breaker characteristic tester is mounted on the vehicle platform, and the pre-wiring module is also mounted on the vehicle platform, with a pluggable terminal block installed on the pre-wiring module. The opening and closing control lines of the circuit breaker characteristic tester are pre-connected and permanently connected to one side of the pluggable terminal block. The other side of the pluggable terminal block is used for detachably connecting various circuit breaker secondary plug modules. The circuit breaker secondary plug modules are used to plug into the secondary socket of the high-voltage circuit breaker.

[0006] This includes a status warning system integrated into the vehicle platform; the status warning system includes a signal acquisition module, a diagnostic module, and a warning output module; the signal acquisition module includes a triaxial accelerometer, a micro-current injection circuit, and a voltage sampling circuit; the triaxial accelerometer is fixedly mounted on the housing of the circuit breaker secondary plug module; the micro-current injection circuit is integrated with the circuit breaker characteristic tester and can be selectively and controllably connected to the opening coil circuit or closing coil circuit of the high-voltage circuit breaker to inject a constant micro-current with an amplitude between 1 and 10 mA into the opening coil or closing coil of the high-voltage circuit breaker; the input terminal of the voltage sampling circuit is connected in parallel with the output terminal of the micro-current injection circuit to measure the voltage drop generated across the currently connected opening coil or closing coil by the micro-current; when the diagnostic module determines that the high-voltage circuit breaker is abnormal, a warning message containing the specific abnormality type is generated by sending a command to the warning output module.

[0007] The diagnostic module is configured to execute vibration signal analysis logic and coil status analysis logic, and trigger an early warning based on the analysis results. The vibration signal analysis logic includes the following steps: S1: Under the healthy condition of the high-voltage circuit breaker, collect vibration signals and establish a spectrum, and record the vibration energy reference value in the first frequency band from 1000Hz to 2500Hz. And the vibration energy reference value recorded in the second frequency band from 200Hz to 800Hz. ; S2: During the monitoring process, the current vibration signal is acquired and its current spectrum is calculated to obtain the real-time vibration energy value within the first frequency band of the current spectrum. and the real-time vibration energy value in the second frequency band. ; S3: If and If the ratio exceeds the first threshold, it is determined that there is a potential risk of loose screws; if and If the ratio exceeds the second threshold, it is determined that there is a potential for mechanical jamming.

[0008] The coil state analysis logic includes the following steps: S1: The voltage drop measured by the voltage sampling circuit. and the current value set by the microcurrent injection circuit By Ohm's Law Calculate the real-time resistance value of the slitting coil respectively. Real-time resistance value of the closing coil ; S2: Will and The resistance values ​​are compared with the pre-stored standard resistance values ​​of the high-voltage circuit breaker's opening and closing coils. If the absolute value of the deviation of any real-time resistance value from its standard resistance value exceeds the preset third threshold, the value is determined accordingly. If so, the state of the tripping coil or closing coil is determined to be abnormal.

[0009] Specifically, the "mechanical jamming hazard" detected by this invention refers to a potential fault in the operating mechanism of a high-voltage circuit breaker where poor lubrication, component wear, or foreign object intrusion leads to an abnormal increase in friction of moving parts such as transmission links and pins, which, although not completely jammed, has already caused sluggish operation. The system also includes a mechanical efficiency monitoring system for evaluating the operating mechanism of the high-voltage circuit breaker. This system comprises a coil circuit power monitoring unit and a vibration energy acquisition unit. The coil circuit power monitoring unit includes a high-side current sampling circuit and a high-voltage differential voltage sampling circuit. The input of the high-side current sampling circuit is connected in series to the tripping control circuit and / or closing control circuit between the micro-current injection circuit and the pluggable terminal block, for acquiring the instantaneous current value flowing through the corresponding tripping or closing coil. The input terminal of the high-voltage differential voltage sampling circuit is connected in parallel to the tripping control circuit and / or closing control circuit between the micro-current injection circuit and the pluggable terminal block, for acquiring the instantaneous voltage value across the corresponding tripping coil or closing coil. The coil circuit power monitoring unit synchronously acquires data at a sampling rate of not less than 100kHz. and And based on the formula = Calculate the instantaneous input power.

[0010] The vibration energy acquisition unit is connected to the triaxial accelerometer for processing the acquired vibration acceleration signals. Perform numerical integration to obtain instantaneous velocity Then calculate the instantaneous vibration kinetic energy. , where k is the equivalent quality coefficient preset based on the circuit breaker model.

[0011] The mechanical efficiency monitoring system further includes an energy efficiency calculation module; the energy efficiency calculation module includes the following steps: S1: Regarding the instantaneous input power The time interval from the start of the operating command to the basic subsidence of mechanical vibration Integrate within the range to obtain the total input electrical energy. The integration interval is ; S2: Obtain the instantaneous vibration kinetic energy In the time interval Maximum value within ; S3: Calculate mechanical energy conversion efficiency ; S4: Calculate the real-time efficiency Compared with the pre-stored standard efficiency If a comparison is made, Below If the amplitude exceeds the preset threshold, an alert will be triggered.

[0012] The present invention has the following beneficial effects: This invention combines a pulley-equipped vehicle platform, a pre-wiring module, and a pluggable terminal block to achieve permanent pre-connection of the tester's opening and closing control lines and plug-and-play connection on-site, thereby fundamentally avoiding on-site wiring operations and eliminating the risk of incorrect wiring. Meanwhile, by integrating a triaxial accelerometer into the housing of the secondary plug module and combining it with a multi-signal acquisition system consisting of a micro-current injection circuit and a voltage sampling circuit, this invention enables synchronous monitoring of the mechanical vibration characteristics and coil resistance status of the circuit breaker without power interruption. This achieves early detection and precise location of mechanical hazards such as loose screws and jammed mechanisms, as well as electrical defects such as short circuits between coil turns. This invention also constructs a mechanical efficiency evaluation model for the operating mechanism by employing a collaborative analysis of high sampling rate power monitoring and vibration kinetic energy calculation. This upgrades the process from single-parameter detection to comprehensive performance evaluation, achieving quantitative evaluation of the health status of the circuit breaker mechanism and predictive maintenance guidance. Ultimately, through the multi-level cooperation of the mobile platform, pre-wiring module, status early warning and efficiency monitoring system, it achieves a comprehensive effect of improving testing safety, efficiency and intelligent equipment operation and maintenance. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the mobile testing device of the present invention. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0015] Please see Figure 1 The invention provides a technical solution: A mobile testing device for high-voltage circuit breaker characteristic testing, characterized in that it includes a vehicle platform with pulleys, a circuit breaker characteristic tester, and a pre-wiring module. The circuit breaker characteristic tester is mounted on the vehicle platform, and the pre-wiring module is mounted on the vehicle platform, with a pluggable terminal block installed on the pre-wiring module. The opening and closing control lines of the circuit breaker characteristic tester are pre-connected and permanently connected to one side of the pluggable terminal block. The other side of the pluggable terminal block is used for detachably connecting various circuit breaker secondary plug modules. The circuit breaker secondary plug modules are used to plug into the secondary socket of the high-voltage circuit breaker.

[0016] In existing technologies, testing personnel must open the operating high-voltage switchgear on-site, consult drawings, identify terminals, disassemble existing wiring, and connect test leads in a energized environment. This process not only takes more than 30 minutes but also carries a high risk of short circuits, equipment damage, and even personal injury due to incorrect wiring. This invention, by fixing the circuit breaker characteristic tester to a wheeled mobile vehicle and incorporating pre-wiring modules and pluggable terminal blocks, creatively and accurately completes and permanently fixes all the aforementioned complex and high-risk on-site wiring procedures in a safe laboratory environment. This fundamentally changes the on-site work: operators no longer need to use tools to touch any electrical terminals; they only need to insert the pre-installed secondary plug module, matching the circuit breaker model, into the corresponding secondary socket. This setup completely restructures the traditional testing process and completely avoids repeated twisting and damage to the original terminal blocks.

[0017] Specifically, it also includes a manual high-voltage circuit breaker characteristic test method, which uses the aforementioned mobile test device for high-voltage circuit breaker characteristic testing. The characteristic test method includes the following steps: S1. Equipment placement and module adaptation: Push the mobile test device to the front of the high-voltage circuit breaker cabinet to be tested; select the matching circuit breaker secondary plug module according to the circuit breaker model and install it on the pre-wiring module. S2. Pre-wiring confirmation: The opening and closing control line of the circuit breaker characteristic tester has been pre-connected to one side of the pluggable terminal block; the lead wire of the circuit breaker secondary plug module has also been pre-connected to the other side of the pluggable terminal block, forming a complete test circuit that does not require on-site wiring. S3. Non-destructive connection: The secondary plug module of the circuit breaker is directly connected to the secondary socket on the circuit breaker body to realize the electrical connection between the circuit breaker opening and closing coil circuit and the test instrument. This process does not touch the original wiring terminals in the circuit breaker cabinet at all. S4. Perform the test: Start the circuit breaker characteristic tester. The tester sends a tripping or closing command to the circuit breaker through the established pre-wiring circuit and simultaneously collects the circuit breaker's operating parameters to complete the characteristic test. S5. Disassembly and transfer: After the test is completed, directly unplug the secondary plug module of the circuit breaker and push the entire mobile test device to the position of the next circuit breaker to be tested, and repeat steps S1-S4.

[0018] This mobile testing device also includes a status warning system integrated on the vehicle platform; the status warning system includes a signal acquisition module, a diagnostic module, and a warning output module; the signal acquisition module includes a triaxial accelerometer, a micro-current injection circuit, and a voltage sampling circuit; the triaxial accelerometer is fixedly mounted on the housing of the circuit breaker secondary plug module; the micro-current injection circuit is integrated with the circuit breaker characteristic tester and can be selectively and controllably connected to the opening coil circuit or closing coil circuit of the high-voltage circuit breaker to inject a constant micro-current with an amplitude between 1 and 10 mA into the opening coil or closing coil of the high-voltage circuit breaker; the input terminal of the voltage sampling circuit is connected in parallel with the output terminal of the micro-current injection circuit to measure the voltage drop generated across the currently connected opening coil or closing coil by the micro-current; when the diagnostic module determines that the high-voltage circuit breaker is abnormal, a warning message containing the specific abnormality type is generated by sending a command to the warning output module.

[0019] The diagnostic module is configured to execute vibration signal analysis logic and coil status analysis logic, and trigger an early warning based on the analysis results; The vibration signal analysis logic includes the following steps: S1: Under the healthy condition of the high-voltage circuit breaker, collect vibration signals and establish a spectrum, and record the vibration energy reference value in the first frequency band from 1000Hz to 2500Hz. And the vibration energy reference value recorded in the second frequency band from 200Hz to 800Hz. ; S2: During the monitoring process, the current vibration signal is acquired and its current spectrum is calculated to obtain the real-time vibration energy value within the first frequency band of the current spectrum. and the real-time vibration energy value in the second frequency band. ; S3: If and If the ratio exceeds the first threshold, it is determined that there is a potential risk of loose screws; if and If the ratio exceeds the second threshold, it is determined that there is a potential for mechanical jamming.

[0020] The coil state analysis logic includes the following steps: S1: The voltage drop measured by the voltage sampling circuit. and the current value set by the microcurrent injection circuit By Ohm's Law Calculate the real-time resistance value of the slitting coil respectively. Real-time resistance value of the closing coil ; S2: Will and The resistance values ​​are compared with the pre-stored standard resistance values ​​of the high-voltage circuit breaker's opening and closing coils. If the absolute value of the deviation of any real-time resistance value from its standard resistance value exceeds the preset third threshold, the value is determined accordingly. If so, the state of the tripping coil or closing coil is determined to be abnormal.

[0021] The condition early warning system is based on the actual needs of preventative maintenance in the operation and maintenance of high-voltage circuit breakers. Traditional characteristic tests can only obtain mechanical parameters during operation and cannot reflect potential wear or early aging of the coils within the mechanism. The significance of this system lies in its ability to achieve real-time assessment of the mechanical and electrical condition of the circuit breaker without power interruption through multi-sensor fusion technology.

[0022] Specifically, integrating a triaxial accelerometer into the secondary plug module housing allows for direct acquisition of the circuit breaker's vibration signals through physical contact after plugging in, solving the problem of temporary installation required by traditional vibration sensors. The combination of a micro-current injection circuit and a voltage sampling circuit enables online monitoring of coil resistance by injecting a safe micro-current into the secondary circuit and measuring the voltage drop; this method does not affect equipment operation. The vibration analysis logic set in the diagnostic module (monitoring loose screws in the 1000-2500Hz band and mechanism jamming in the 200-800Hz band) utilizes effective characteristic frequency bands verified through extensive experimentation, accurately correlating vibration signals with specific fault types. Coil resistance monitoring can detect early signs of inter-turn short circuits that are undetectable by conventional testing.

[0023] It also includes a mechanical efficiency monitoring system for evaluating the operating mechanism of a high-voltage circuit breaker. The mechanical efficiency monitoring system comprises a coil circuit power monitoring unit and a vibration energy acquisition unit. The coil circuit power monitoring unit includes a high-side current sampling circuit and a high-voltage differential voltage sampling circuit. The input terminal of the high-side current sampling circuit is connected in series to the tripping control circuit and / or closing control circuit between the micro-current injection circuit and the pluggable terminal block, for acquiring the instantaneous current value flowing through the corresponding tripping or closing coil. The input terminal of the high-voltage differential voltage sampling circuit is connected in parallel to the tripping control circuit and / or closing control circuit between the micro-current injection circuit and the pluggable terminal block, for acquiring the instantaneous voltage value across the corresponding tripping coil or closing coil. The coil circuit power monitoring unit synchronously acquires data at a sampling rate of not less than 100kHz. and And based on the formula = Calculate the instantaneous input power.

[0024] The vibration energy acquisition unit is connected to the triaxial accelerometer for signal processing of the acquired vibration acceleration signals. Perform numerical integration to obtain instantaneous velocity Then calculate the instantaneous vibration kinetic energy. , where k is the equivalent quality coefficient preset based on the circuit breaker model.

[0025] The mechanical efficiency monitoring system also includes an energy efficiency calculation module; the energy efficiency calculation module includes the following steps: S1: Regarding the instantaneous input power The time interval from the start of the operating command to the basic subsidence of mechanical vibration Integrate within the range to obtain the total input electrical energy. The integration interval is ; S2: Obtain the instantaneous vibration kinetic energy In the time interval Maximum value within ; S3: Calculate mechanical energy conversion efficiency ; S4: Calculate the real-time efficiency Compared with the pre-stored standard efficiency If a comparison is made, Below If the amplitude exceeds the preset threshold, an alert will be triggered.

[0026] Specifically, the purpose of the mechanical efficiency monitoring system is to overcome the limitations of traditional characteristic tests that can only detect action parameters, and to quantitatively assess the overall health status of the circuit breaker operating mechanism through the comprehensive indicator of energy conversion efficiency. The system is designed based on the following considerations: Wear, jamming, or poor lubrication that occur in the operating mechanism after long-term operation, while not immediately causing parameters such as opening and closing times to exceed limits, will significantly increase the mechanism's motion resistance, manifesting as a decrease in mechanical efficiency. Therefore, efficiency indicators can serve as an early and sensitive criterion for the degradation of mechanism performance.

[0027] In practical implementation, a high sampling rate (≥100kHz) is used to synchronously acquire the voltage and current of the coil circuit, enabling accurate calculation of the instantaneous input power during operation. The total input electrical energy is then obtained through integration. Simultaneously, kinetic energy is calculated by integrating vibration acceleration, reflecting the effective mechanical energy generated by the mechanism's motion. The ratio of maximum kinetic energy to total input electrical energy is defined as mechanical efficiency. It has a clear physical meaning and can effectively characterize the integrity of the energy conversion process.

[0028] This mechanical efficiency monitoring system, together with the aforementioned vibration spectrum analysis and coil resistance detection, constitutes a multi-layered and complementary diagnostic system. In practical applications, when the mechanical efficiency monitoring system detects the efficiency of a circuit breaker... When a significant decrease in efficiency does not trigger traditional parameter alarms, an early warning of mechanical performance degradation can be issued, prompting maintenance personnel to prioritize a detailed inspection of the equipment using vibration spectrum analysis. This allows for rapid identification of the specific cause of the efficiency decline, such as loose screws or mechanical jamming. Conversely, when vibration spectrum analysis reveals localized issues (such as loose individual screws) without a clear abnormality in mechanical efficiency, the system can record these issues and recommend addressing them during planned shutdowns to avoid unnecessary emergency stoppages. This multi-parameter fusion diagnostic strategy enhances the ability to warn of latent faults and optimizes the allocation of maintenance resources, demonstrating a significant advancement in the depth and practicality of condition assessment.

[0029] The embodiments described above are merely illustrative of specific implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A mobile testing device for characteristic testing of high-voltage circuit breakers, characterized in that: The device includes a vehicle platform with pulleys, a circuit breaker characteristic tester, and a pre-wiring module. The circuit breaker characteristic tester is mounted on the vehicle platform, and the pre-wiring module is also mounted on the vehicle platform, with a pluggable terminal block installed on the pre-wiring module. The opening and closing control lines of the circuit breaker characteristic tester are pre-connected and permanently connected to one side of the pluggable terminal block. The other side of the pluggable terminal block is used to detachably connect various circuit breaker secondary plug modules. The circuit breaker secondary plug modules are used to plug into the secondary socket of a high-voltage circuit breaker.

2. The mobile testing device for high-voltage circuit breaker characteristic testing as described in claim 1, characterized in that: It also includes a status warning system integrated into the vehicle platform; the status warning system includes a signal acquisition module, a diagnostic module, and a warning output module; the signal acquisition module includes a triaxial accelerometer, a micro-current injection circuit, and a voltage sampling circuit; the triaxial accelerometer is fixedly mounted on the housing of the circuit breaker secondary plug module; the micro-current injection circuit is integrated with the circuit breaker characteristic tester and can be selectively and controllably connected to the opening coil circuit or closing coil circuit of the high-voltage circuit breaker to inject a constant micro-current with an amplitude between 1 and 10 mA into the opening coil or closing coil of the high-voltage circuit breaker; the input terminal of the voltage sampling circuit is connected in parallel with the output terminal of the micro-current injection circuit to measure the voltage drop generated across the currently connected opening coil or closing coil by the micro-current; when the diagnostic module determines that the high-voltage circuit breaker is abnormal, a warning message containing the specific abnormality type is generated by sending a command to the warning output module.

3. The mobile testing device for high-voltage circuit breaker characteristic testing as described in claim 2, characterized in that: The diagnostic module is configured to execute vibration signal analysis logic and coil status analysis logic, and trigger an early warning based on the analysis results; The vibration signal analysis logic includes the following steps: S1: Under the healthy condition of the high-voltage circuit breaker, collect vibration signals and establish a spectrum, and record the vibration energy reference value in the first frequency band from 1000Hz to 2500Hz. And the vibration energy reference value recorded in the second frequency band from 200Hz to 800Hz. ; S2: During the monitoring process, the current vibration signal is acquired and its current spectrum is calculated to obtain the real-time vibration energy value within the first frequency band of the current spectrum. and the real-time vibration energy value in the second frequency band. ; S3: If and If the ratio exceeds the first threshold, it is determined that there is a potential risk of loose screws; if and If the ratio exceeds the second threshold, it is determined that there is a potential for mechanical jamming.

4. The mobile testing device for high-voltage circuit breaker characteristic testing as described in claim 3, characterized in that: The coil state analysis logic includes the following steps: S1: The voltage drop measured by the voltage sampling circuit. and the current value set by the microcurrent injection circuit By Ohm's Law Calculate the real-time resistance value of the slitting coil respectively. Real-time resistance value of the closing coil ; S2: Will and The resistance values ​​are compared with the pre-stored standard resistance values ​​of the high-voltage circuit breaker's opening and closing coils. If the absolute value of the deviation of any real-time resistance value from its standard resistance value exceeds the preset third threshold, the value is determined accordingly. If so, the state of the tripping coil or closing coil is determined to be abnormal.

5. A mobile testing device for high-voltage circuit breaker characteristic testing as described in claim 2, characterized in that: It also includes a mechanical efficiency monitoring system for evaluating the operating mechanism of a high-voltage circuit breaker. The mechanical efficiency monitoring system comprises a coil circuit power monitoring unit and a vibration energy acquisition unit. The coil circuit power monitoring unit includes a high-side current sampling circuit and a high-voltage differential voltage sampling circuit. The input terminal of the high-side current sampling circuit is connected in series to the tripping control circuit and / or closing control circuit between the micro-current injection circuit and the pluggable terminal block, for acquiring the instantaneous current value flowing through the corresponding tripping or closing coil. The input terminal of the high-voltage differential voltage sampling circuit is connected in parallel to the tripping control circuit and / or closing control circuit between the micro-current injection circuit and the pluggable terminal block, for acquiring the instantaneous voltage value across the corresponding tripping coil or closing coil. The coil circuit power monitoring unit synchronously acquires data at a sampling rate of not less than 100kHz. and And based on the formula = Calculate the instantaneous input power.

6. The mobile testing device for high-voltage circuit breaker characteristic testing as described in claim 5, characterized in that: The vibration energy acquisition unit is connected to the triaxial accelerometer for signal processing of the acquired vibration acceleration signals. Perform numerical integration to obtain instantaneous velocity Then calculate the instantaneous vibration kinetic energy. , where k is the equivalent quality coefficient preset based on the circuit breaker model.

7. A mobile testing device for high-voltage circuit breaker characteristic testing as described in claim 6, characterized in that: The mechanical efficiency monitoring system also includes an energy efficiency calculation module; the energy efficiency calculation module includes the following steps: S1: Regarding the instantaneous input power The time interval from the start of the operating command to the basic subsidence of mechanical vibration Integrate within the range to obtain the total input electrical energy. The integration interval is ; S2: Obtain the instantaneous vibration kinetic energy In the time interval Maximum value within ; S3: Calculate mechanical energy conversion efficiency ; S4: Calculate the real-time efficiency Compared with the pre-stored standard efficiency If a comparison is made, Below If the amplitude exceeds the preset threshold, an alert will be triggered.

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