A protection method and system for a vacuum circuit breaker

Abstract

The present invention provides a protection method and system for a vacuum circuit breaker, including: acquiring voltage data, current data, and temperature data detected by passive means of the vacuum circuit breaker, and uploading the voltage data, current data, and temperature data detected by passive means to an intelligent monitoring unit; the intelligent monitoring unit performs real-time monitoring and analysis and calculation on the corresponding voltage data, current data, and temperature data detected by passive means to obtain the power quality data of the vacuum circuit breaker; a contact travel displacement sensor is configured in the operating mechanism of the vacuum circuit breaker, and the contact travel displacement sensor is used to monitor the mechanical characteristic data of the contacts in the vacuum circuit breaker during operation; the intelligent monitoring unit performs multi-dimensional comprehensive analysis on the performance of the vacuum circuit breaker according to the power quality data and the mechanical characteristic data, and further executes the microcomputer protection of the vacuum circuit breaker according to the power quality monitoring data and the mechanical characteristic monitoring data.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and particularly to a protection method and system for a vacuum circuit breaker. Background Art

[0002] Currently, the following technical problems exist in traditional vacuum circuit breakers: 1. The current transformers installed in switchgear are electromagnetic current transformers, generally installed in switchgear, with a short available current over-tolerance accuracy curve and the drawback of magnetic saturation; 2. They do not have a voltage detection function; 3. They do not have a function for monitoring the health and operating status of the circuit breaker itself. That is to say, existing vacuum circuit breakers lack multi-dimensional fault safety monitoring, and in the prior art, there is no self-analysis of the operating status and self-diagnosis of faults based on data from different dimensions of the vacuum circuit breaker, making it difficult for the existing vacuum circuit breakers in the prior art to adapt to the circuit breaking environment of complex circuits. Summary of the Invention

[0003] One object of the present invention is to provide a protection method and system for a vacuum circuit breaker. The method and system are configured with an intelligent monitoring unit, which is used to obtain temperature data detected by passive detection of the vacuum circuit breaker, voltage and current data detected by a Hall sensor, and contact travel displacement data detected by a contact travel displacement sensor. The data from the above different sensors are uploaded to the intelligent monitoring unit, and the intelligent monitoring unit performs comprehensive analysis based on the detected different types of data, and then can judge the safety performance of the vacuum circuit breaker and perform voltage and current protection on the line connected to the vacuum circuit breaker.

[0004] Another object of the present invention is to provide a protection method and system for a vacuum circuit breaker. The method and system use different types of sensors to respectively obtain the electromagnetic performance data and mechanical performance data of the vacuum circuit breaker. The present invention accurately analyzes the safety performance of the vacuum circuit breaker from multiple dimensions based on the mechanical performance data and electromagnetic performance data of the vacuum circuit breaker, and can effectively improve the safety risk identification of the vacuum circuit breaker compared with the traditional monitoring only from the perspective of voltage and current.

[0005] Another object of the present invention is to provide a protection method and system for a vacuum circuit breaker. The method and system use the voltage and current data detected by a Hall sensor. Compared with the traditional method of using a current transformer to detect voltage and current, the present invention using the Hall sensor can effectively reduce the magnetic saturation risk that the primary current and secondary current of the current transformer are no longer proportional, and improve the accuracy of current and voltage detection of the vacuum circuit breaker.

[0006] To achieve at least one of the above objects of the invention, the present invention further provides a protection method for a vacuum circuit breaker, the method comprising:

[0007] Obtain the voltage data, current data and temperature data detected by passive detection of the line connected to the vacuum circuit breaker, upload the voltage data, current data and temperature data detected by passive detection to the intelligent monitoring unit, and perform online monitoring. The intelligent monitoring unit has the functions of power quality monitoring of the line and mechanical characteristic monitoring of the vacuum circuit breaker;

[0008] The intelligent monitoring unit monitors the voltage data and current data of the corresponding line in real time, and analyzes and calculates the power quality data of the line connected to the vacuum circuit breaker according to the monitoring data analysis;

[0009] A contact stroke displacement sensor is configured in the operating mechanism of the vacuum circuit breaker, and the contact stroke displacement sensor is used to monitor the mechanical characteristic data of the contacts in the vacuum circuit breaker during operation in real time;

[0010] The intelligent monitoring unit performs microcomputer protection after abnormal analysis according to the voltage data and current data detected by the line connected to the vacuum circuit breaker.

[0011] According to one preferred embodiment of the present invention, the analysis method of the power quality data of the line connected to the vacuum circuit breaker includes: pre-obtaining the power standard parameters of the line connected to the corresponding type of vacuum circuit breaker: power grid frequency, three-phase fundamental voltage, current effective value, fundamental active power, reactive power, power factor and phase power standard parameters, and obtaining the historical detection data of the power parameters of the line connected to the vacuum circuit breaker, wherein the historical detection data of the power parameters includes current and voltage, and comparing and analyzing the historical detection data with the power standard parameters of the line connected to the corresponding vacuum circuit breaker, wherein the comparison and analysis includes the power grid frequency, three-phase fundamental voltage, current effective value, fundamental active power, reactive power, power factor and phase of the line connected to the vacuum circuit breaker, and judging the difference between the historical detection data and the standard parameters of the line connected to the corresponding vacuum circuit breaker; further calculating and analyzing to obtain voltage deviation, frequency deviation, three-phase voltage unbalance degree, three-phase current unbalance degree and negative sequence voltage for the analysis of the power quality of the line connected to the vacuum circuit breaker.

[0012] According to one preferred embodiment of the present invention, the mechanical characteristic monitoring content of the vacuum circuit breaker includes: the primary breaking current of the vacuum circuit breaker, closing / opening coil current, energy storage motor current, contact stroke, mechanical vibration, switch auxiliary contact state, control loop voltage; wherein the three-phase current and voltage of the closing / opening coils inside the corresponding vacuum circuit breaker are obtained to construct a recording curve, and the mechanical characteristics of the corresponding vacuum circuit breaker are analyzed and judged according to the recording curve, and the recording curve is compared with the standard curve to judge the health status of the mechanical characteristics of the vacuum circuit breaker.

[0013] According to another preferred embodiment of the present invention, the method for calculating the power quality of the line connected to the vacuum circuit breaker includes: pre-configuring the detection weights of different parameter types of the line connected to the vacuum circuit breaker, and judging whether the detection data of the line connected to the corresponding vacuum circuit breaker in the corresponding situation exceeds the standard parameters of the data of the corresponding type of the line connected to the vacuum circuit breaker according to the historical voltage data, current data and temperature data detected by the sensors connected to the line connected to the vacuum circuit breaker. If it exceeds the standard parameters, mark the data with the exceeded standard parameters, extract the data with the exceeded standard parameters of the corresponding type of parameters in the historical data, and calculate the frequency of the data with the exceeded standard. The detection data and frequency including the data with the exceeded standard parameters are used to calculate the power quality data of the line connected to the vacuum circuit breaker.

[0014] According to another preferred embodiment of the present invention, define w n as the data with the exceeded standard of the corresponding type in the historical data of the line connected to the vacuum circuit breaker, where the standard data of the corresponding type is w s , where n is the number of data of the corresponding data type, and f is the frequency of the parameters with the exceeded standard of the corresponding type. Then the calculation method of the power quality data F of the line connected to the vacuum circuit breaker includes: F = , where σ n is the weight assignment of the corresponding detection parameter type, and β is the adjustment parameter. Judge the power control performance of the current vacuum circuit breaker according to the calculated power quality data F, and use it to perform the maintenance or replacement operation of the vacuum circuit breaker. The higher the value of the power quality data F, the worse the power control performance of the corresponding vacuum circuit breaker.

[0015] According to another preferred embodiment of the present invention, the microcomputer protection method of the vacuum circuit breaker includes: extracting the data with the exceeded standard of the line connected to the vacuum circuit breaker and judging the type of the data with the exceeded standard, and respectively performing different microcomputer protections on the devices connected to the vacuum circuit breaker according to the type of the data with the exceeded standard. The microcomputer protection includes: motor starting protection, quick break, time-limited quick break, overcurrent protection, inverse time overcurrent, zero-sequence overcurrent protection, overload protection, non-electric quantity protection, bus charging protection, and the inverse time overcurrent includes general inverse time, very inverse time and extreme inverse time.

[0016] According to another preferred embodiment of the present invention, the method for maintenance operation includes: pre-constructing a fault type mapping table of the line connected to the vacuum circuit breaker including at least one combination among different detection type data such as over-standard temperature, over-standard voltage, and over-standard current. When it is determined that maintenance operation is required after the line connected to the vacuum circuit breaker is detected, look up the fault type mapping table of the line connected to the vacuum circuit breaker according to the actually detected over-standard data of different types, obtain the fault of the line connected to the corresponding type of vacuum circuit breaker, and execute the microcomputer protection for the fault of the line connected to the corresponding vacuum circuit breaker.

[0017] According to another preferred embodiment of the present invention, the method for monitoring the mechanical characteristics of the vacuum circuit breaker includes: obtaining the stroke and over-travel of the operating mechanism of the vacuum circuit breaker according to the contact stroke displacement sensor, calculating the opening and closing speeds of the corresponding operating mechanism by obtaining the opening and closing times of the operating mechanism, and obtaining the operating state of the motor of the vacuum circuit breaker according to the opening and closing speeds; and configuring a passive temperature sensor in the operating mechanism of the vacuum circuit breaker to detect the temperature values of the contacts and contact arms of the operating mechanism; calculating the mechanical characteristic score of the vacuum circuit breaker by using the weighted summation method according to the stroke, over-travel, opening and closing speeds, motor operating state, and temperature values of the contacts and contact arms of the operating mechanism, and judging whether mechanical maintenance is required for the vacuum circuit breaker according to the mechanical characteristic score.

[0018] According to another preferred embodiment of the present invention, weighted summation calculation is performed based on the power quality data F and the mechanical characteristic score. The result obtained from the weighted summation calculation is used for the performance analysis of the overall vacuum circuit breaker, and fault judgment is performed according to the abnormal data of each dimension according to a preset fault type mapping list.

[0019] In order to achieve at least one of the above invention purposes, the present invention further provides a protection system for a vacuum circuit breaker, and the system executes the above protection method for a vacuum circuit breaker.

[0020] The present invention further provides a computer-readable storage medium, and the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the above protection method for a vacuum circuit breaker. Description of the Drawings

[0021] Figure 1 It shows a schematic flow chart of a protection method for a vacuum circuit breaker of the present invention. Detailed Embodiments

[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and other obvious variations can be conceived by those skilled in the art. The basic principles defined in the following description of the present invention can be applied to other embodiments, variants, improvements, equivalent solutions, and other technical solutions without departing from the spirit and scope of the present invention.

[0023] It can be understood that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in other embodiments, the number of the element can be multiple. The term "a" cannot be understood as a limitation on the quantity.

[0024] Please refer to Figure 1 , the present invention provides a protection method and system for a vacuum circuit breaker. The method mainly includes the following steps: First, it is necessary to configure in the vacuum circuit breaker a temperature sensor including a Hall voltage sensor, a Hall current sensor, and RFID passive detection. The Hall voltage sensor and the Hall current sensor are used to detect the voltage and current when the vacuum circuit breaker is in different states. Since the voltage sensor and the current sensor in the present invention use Hall devices to replace the mutual inductors in the traditional technical solutions, the disadvantages of short current over-tolerance accuracy curves and magnetic saturation in the traditional mutual inductors can be effectively reduced. The Hall voltage sensor, the Hall current sensor, and the temperature sensor for RFID passive detection are respectively communicatively connected to an intelligent monitoring unit. At least one processor is provided in the intelligent monitoring unit. The processor receives voltage, current, and temperature data from the Hall voltage sensor, the Hall current sensor, and the temperature sensor for RFID passive detection, and analyzes and judges the power quality data of the line connected to the vacuum circuit breaker according to the voltage, current, and temperature data. In addition, in the present invention, a contact stroke displacement sensor and a passive temperature sensor for the contact-contact arm are configured for the operating mechanism in the vacuum circuit breaker, which are respectively used to detect the mechanical characteristic data of the operating mechanism. When there are certain problems in the operating mechanism of the vacuum circuit breaker, mechanical fault prediction and fault maintenance can be carried out in a timely manner. In the present invention, based on the above power quality data and mechanical characteristic data, comprehensive analysis is performed to obtain evaluation data on the overall performance of the vacuum circuit breaker, so as to perform comprehensive analysis on the data of the vacuum circuit breaker.

[0025] Specifically, the analysis method for the power quality data of the vacuum circuit breaker includes: pre-acquiring the power standard parameters of the line connected to the corresponding type of vacuum circuit breaker, where the power standard parameters include: power grid frequency, three-phase fundamental voltage, effective current value, fundamental active power, reactive power, power factor, and power standard parameters of phase, and acquiring the historical detection data of the power parameters of the vacuum circuit breaker installed in the circuit. Comparing and analyzing the historical detection data with the power standard parameters of the line connected to the corresponding vacuum circuit breaker to determine the difference between the historical detection data and the standard parameters of the corresponding vacuum circuit breaker for the power quality calculation of the line connected to the vacuum circuit breaker. The rated voltage of the vacuum circuit breaker refers to the rated voltage of the system when the vacuum circuit breaker operates normally. This is the nominal voltage of the vacuum circuit breaker, and the vacuum circuit breaker should be able to be used in the power system at this voltage. Each model of the vacuum circuit breaker has its different rated voltage, but when the rated voltage of the vacuum circuit breaker does not match its operating voltage, there will be certain safety risks. The maximum voltage of the vacuum circuit breaker refers to the maximum voltage value that the circuit breaker can withstand under normal operating conditions. This value is usually a certain percentage higher than the rated voltage (such as 15%) to ensure that the circuit breaker can still operate reliably during voltage fluctuations. The maximum voltage is used to indicate whether the fluctuation situation of the current power consumption environment is suitable for the corresponding vacuum circuit breaker. The withstand voltage refers to the effective value of the power frequency alternating voltage that the vacuum circuit breaker can withstand under the specified test conditions. This parameter reflects the insulation ability of the circuit breaker to the power frequency voltage under normal operating conditions. The rated current of the vacuum circuit breaker refers to the current value that the device can pass through for a long time, that is, the rated current of the puller. This is also a basic parameter specified during the design of the vacuum circuit breaker. When the difference between the actually detected current and the rated current is large, it indicates that the adaptability of the vacuum circuit breaker in this circuit is poor. The standard parameters of overcurrent release with different delays and the standard parameters of rated short-circuit breaking capacity are the sectional standard parameters set for different delays, where different delays can be set according to the model of the vacuum circuit breaker respectively. For example, 1. Long-delay operating current (Ir1): Usually set to (0.4 - 1) times the rated current; Short-delay operating current (Ir2): Some circuit breakers have a short-delay function, and its operating current is usually set to (0.4 - 15) times the rated current; Instantaneous operating current (Ir3): The setting of the instantaneous operating current is usually relatively high and is used to quickly cut off the circuit in case of a serious short-circuit fault. In some other preferred embodiments of the present invention, data including but not limited to power factor, system frequency, voltage deviation, three-phase voltage, current unbalance degree, voltage fluctuation and flicker, capturing and recording transient waveforms, voltage swell, etc. can be calculated and analyzed based on the voltage and current detected in real time on the line connected to the vacuum circuit breaker.

[0026] It should be noted that in the present invention, historical data of a Hall voltage sensor, a Hall current sensor, and a temperature sensor for passive RFID detection of the line connected to the vacuum circuit breaker need to be obtained within a certain period of time, for example, historical data on a weekly basis. After obtaining the historical data of the corresponding sensors, the following comparison operations are further performed to calculate the power quality of the corresponding vacuum circuit breaker: Detection weights for different parameter categories of the vacuum circuit breaker are pre-configured, and based on the historical voltage data, current data, and temperature data detected by the corresponding sensors of the line connected to the vacuum circuit breaker, it is determined whether the detection data of the corresponding vacuum circuit breaker in the corresponding situation exceeds the standard parameters of the corresponding type of data of the line connected to the vacuum circuit breaker. If it exceeds the standard parameters, the data with the exceeded standard parameters is marked, and the data with the exceeded standard parameters of the corresponding type of parameters in the historical data is extracted, and the frequency of the exceeded standard data is calculated. The power quality data of the vacuum circuit breaker is calculated based on the detection data and frequency of the exceeded standard parameter data. Since different types of data have different effects on the performance of the vacuum circuit breaker, the present invention needs to configure different weight parameters according to their influence degrees on the electrical performance of the vacuum circuit breaker respectively. The greater the deviation between the above historical detection data and the standard data, the greater the impact on the electrical performance of the vacuum circuit breaker, and the higher the weight coefficient of the corresponding detection type also indicates a greater impact.

[0027] Further, define w n as the data with exceeded standard of the corresponding type in the historical data of the line connected to the vacuum circuit breaker, where the standard data of the corresponding type is w s , where n is the number of data of the corresponding data type, and f is the frequency of the exceeded standard parameters of the corresponding type. Then the calculation method of the power quality data F of the line connected to the vacuum circuit breaker includes: F = , where σ n is the weight assignment for the corresponding detection parameter type, and β is an adjustment parameter. The power control performance of the current vacuum circuit breaker is judged according to the calculated power quality data F, which is used to perform maintenance or replacement operations on the vacuum circuit breaker. The higher the value of the power quality data F, the worse the power control performance of the corresponding vacuum circuit breaker.

[0028] In one preferred embodiment of the present invention, a power quality threshold F s for the corresponding vacuum circuit breaker is preset. When the power quality data F of the line connected to the vacuum circuit breaker calculated for the corresponding vacuum circuit breaker is greater than the power quality threshold F s, it is determined that there is a safety risk for the current corresponding vacuum circuit breaker, and the safety maintenance operation of the corresponding vacuum circuit breaker is performed. Further, the over-standard data of the vacuum circuit breaker is extracted and the type of the over-standard data is judged, and different microcomputer protections of the vacuum circuit breaker are respectively performed according to the type of the over-standard data. The methods of the microcomputer protection of the vacuum circuit breaker include but are not limited to: motor starting protection, quick break, time-limited quick break, over-current protection, zero-sequence over-current protection, overload protection, non-electric quantity protection, bus charging protection, etc. The above microcomputer protection is realized based on the microcomputer control equipment connected to the vacuum circuit breaker.

[0029] The method of the maintenance operation includes: pre-constructing a fault type mapping table of the vacuum circuit breaker including at least one combination among different detection type data such as over-standard temperature, over-standard voltage and over-standard current. When it is judged that maintenance operation is required after the vacuum circuit breaker is detected, the fault type mapping table of the vacuum circuit breaker is searched according to the actually detected different types of over-standard data, and the corresponding type of vacuum circuit breaker fault is obtained, and the maintenance strategy for the corresponding vacuum circuit breaker fault is executed. The above fault type mapping list is pre-stored in the intelligent monitoring unit. After the relevant sensor data is uploaded and the corresponding power quality is calculated, the possible fault data is extracted for the maintenance operation of the relevant faults.

[0030] The mechanical characteristic monitoring content of the vacuum circuit breaker includes: the primary breaking current of the vacuum circuit breaker, the closing / opening coil current, the energy storage motor current, the contact stroke, the mechanical vibration, the state of the switch auxiliary contact, and the control loop voltage. The three-phase current and voltage of the closing / opening coil inside the corresponding vacuum circuit breaker are acquired to construct a recording curve, and the mechanical characteristics of the corresponding vacuum circuit breaker are analyzed and judged according to the recording curve. The recording curve is compared with the standard curve to judge the health status of the mechanical characteristics of the vacuum circuit breaker.

[0031] The monitoring method for the mechanical characteristics of the vacuum circuit breaker further includes: obtaining the stroke and overtravel of the operating mechanism of the vacuum circuit breaker according to the contact stroke displacement sensor, calculating the opening and closing speeds of the corresponding operating mechanism by obtaining the opening and closing times of the operating mechanism, and obtaining the operating state of the motor of the vacuum circuit breaker according to the opening and closing speeds; and configuring a passive temperature sensor in the operating mechanism of the vacuum circuit breaker to detect the temperature values of the contacts and contact arms of the operating mechanism; calculating the mechanical characteristic score of the vacuum circuit breaker by using the weighted summation method according to the stroke, overtravel, opening and closing speeds, motor operating state, and temperature values of the contacts and contact arms of the operating mechanism, and judging whether mechanical maintenance is required for the vacuum circuit breaker according to the mechanical characteristic score. Performing a weighted summation calculation according to the power quality data F and the mechanical characteristic score, and the result obtained from the weighted summation calculation is used for the performance analysis of the overall vacuum circuit breaker, and microcomputer protection of the vacuum circuit breaker is performed according to the abnormal data in each dimension according to the preset fault type mapping list.

[0032] Embodiments disclosed in the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. Embodiments disclosed in the present invention include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for performing the methods shown in the flowcharts. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), the above functions defined in the methods of the present application are performed. It should be noted that the computer-readable medium described above in the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the two. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of a computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wire segments, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present application, a computer-readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or combined with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, which carries computer-readable program codes. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, and the computer-readable medium can send, propagate, or transmit a program for use by or combined with an instruction execution system, apparatus, or device. The program codes contained on the computer-readable medium can be transmitted by any appropriate medium, including but not limited to: wireless, wire segments, optical cables, RF, etc., or any suitable combination of the above.

[0033] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a portion of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions noted in the blocks may occur in a different order than that noted in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0034] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the said principles, the embodiments of the present invention may have any variations or modifications.

Claims

1. A vacuum circuit breaker protection method, characterized in that: The method comprises: Obtaining voltage data, current data and passively detected temperature data of the line connected to the vacuum circuit breaker, and uploading the voltage data, current data and passively detected temperature data to an intelligent monitoring unit, and performing online monitoring, wherein the intelligent monitoring unit has a function of monitoring the power quality of the line and a function of monitoring the mechanical characteristics of the vacuum circuit breaker; The intelligent monitoring unit monitors the voltage and current data of the corresponding line in real time, and obtains the power quality data of the line connected to the vacuum circuit breaker based on the monitoring data analysis and calculation; A contact travel displacement sensor is arranged in the operating mechanism of the vacuum circuit breaker, and the contact travel displacement sensor is used to monitor the mechanical characteristic data of the contact in the vacuum circuit breaker in real time during operation; The method for calculating the power quality data of the line connected to the vacuum circuit breaker includes: pre-configuring the detection weights of different parameter types of the line connected to the vacuum circuit breaker, and judging whether the detection data of the line connected to the vacuum circuit breaker under the corresponding situation exceeds the standard parameters of the corresponding type of data of the line connected to the vacuum circuit breaker according to the historical voltage data, current data and temperature data detected by the corresponding sensor of the line connected to the vacuum circuit breaker, if exceeding the standard parameters, marking the data of the exceeding standard parameters, extracting the exceeding standard parameter data of the corresponding type of parameters in the historical data, calculating the frequency of the exceeding standard data, and calculating the power quality data of the line connected to the vacuum circuit breaker according to the detection data and frequency including the exceeding standard parameter data; Among them, the calculation method of power quality data F includes: F= ; is the super-standard data of the corresponding type in the historical data of the line connected to the vacuum circuit breaker, and the standard data of the corresponding type is , n is the number of data of the corresponding data type, f is the frequency of the corresponding type of super-standard parameters, Assign a value to the weight of the corresponding detection parameter type, and β is the adjustment parameter; The mechanical characteristic score of the vacuum circuit breaker is calculated by weighted summation according to the stroke, overtravel, opening and closing speed, motor operation status, and temperature values ​​of the contacts and contact arms of the operating mechanism; A weighted summation calculation is performed based on the power quality data F and the mechanical characteristic score. The result of the weighted summation calculation is used to perform an overall performance analysis of the vacuum circuit breaker, and a fault judgment is performed based on the abnormal data of each dimension according to a preset fault type mapping list.

2. A vacuum circuit breaker protection method according to claim 1, characterized in that: The monitoring content of the mechanical characteristics of the vacuum circuit breaker includes: the primary breaking current of the vacuum circuit breaker, the opening / closing coil current, the energy storage motor current, the contact stroke, the mechanical vibration, the switch auxiliary contact state, and the control circuit voltage; wherein the three-phase current and voltage of the corresponding closing coil in the vacuum circuit breaker are obtained to construct a recording curve, and the mechanical characteristics of the corresponding vacuum circuit breaker are analyzed and judged according to the recording curve, and the recording curve is compared with the standard curve to judge the health status of the mechanical characteristics of the vacuum circuit breaker.

3. A vacuum circuit breaker protection method according to claim 1, characterized in that: The power control performance of the current vacuum circuit breaker is judged according to the calculated power quality data F, so as to perform maintenance or replacement operations on the vacuum circuit breaker, wherein the higher the value of the power quality data F, the worse the power control performance of the corresponding vacuum circuit breaker.

4. A vacuum circuit breaker protection method according to claim 3, characterized in that: The vacuum circuit breaker microcomputer protection method comprises: extracting the super-standard data of the line connected to the vacuum circuit breaker and judging the type of the super-standard data, and respectively executing different microcomputer protections of the equipment connected to the vacuum circuit breaker according to the type of the super-standard data, wherein the microcomputer protection comprises: motor starting protection, quick break, time-limited quick break, overcurrent protection, overcurrent inverse time, zero-sequence overcurrent protection, overload protection, non-electrical quantity protection, bus charging protection, wherein the overcurrent inverse time comprises general inverse time, very inverse time and extreme inverse time.

5. A vacuum circuit breaker protection method according to claim 4, characterized in that: The maintenance operation method comprises: pre-building a fault type mapping table of a line connected to a vacuum circuit breaker including at least one combination of different detection type data of over-standard temperature, over-standard voltage and over-standard current; when the line connected to the vacuum circuit breaker is detected and it is determined that maintenance operation is required, searching the fault type mapping table of the line connected to the vacuum circuit breaker according to different types of over-standard data actually detected, obtaining a corresponding type of vacuum circuit breaker connected line fault, and executing microcomputer protection of the corresponding vacuum circuit breaker connected line fault.

6. A vacuum circuit breaker protection method according to claim 5, characterized in that: The method for monitoring the mechanical characteristics of a vacuum circuit breaker comprises: obtaining the stroke and overtravel of the operating mechanism of the vacuum circuit breaker according to the contact stroke displacement sensor, and calculating the opening and closing speed of the corresponding operating mechanism by obtaining the opening and closing time of the operating mechanism, and obtaining the operating state of the vacuum circuit breaker motor according to the opening and closing speed; and configuring a passive temperature sensor in the operating mechanism of the vacuum circuit breaker to detect the temperature values ​​of the contacts and contact arms of the operating mechanism.

7. A vacuum circuit breaker protection system, characterized in that: The system executes a vacuum circuit breaker protection method as described in any one of claims 1 to 6.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement a vacuum circuit breaker protection method according to any one of claims 1 to 6.

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