Protection method and system of vacuum circuit breaker

Abstract

The invention provides a vacuum circuit breaker protection method and system, and the method comprises the steps: obtaining voltage data, current data and passive detection temperature data of a vacuum circuit breaker, and uploading the voltage data, the current data and the passive detection temperature data to an intelligent monitoring unit; the intelligent monitoring unit monitors the corresponding voltage data, current data and passively detected temperature data in real time and analyzes and calculates to obtain electric energy quality data of the vacuum circuit breaker; a contact stroke displacement sensor is configured in an operating mechanism of the vacuum circuit breaker, and the contact stroke displacement sensor is used for monitoring mechanical characteristic data of a contact in the vacuum circuit breaker in the operation process. And the intelligent monitoring unit performs multi-dimensional comprehensive analysis on the performance of the vacuum circuit breaker according to the electric energy quality data and the mechanical characteristic data, and further performs microcomputer protection of the vacuum circuit breaker according to the electric energy 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 in particular to a protection method and system for a vacuum circuit breaker. Background Art

[0002] At present, the traditional vacuum circuit breakers have the following technical problems: 1. The mutual inductor installed in the switch cabinet is an electromagnetic mutual inductor, which is generally installed in the switch cabinet, which meets the short available current tolerance accuracy curve and has the disadvantage of magnetic saturation; 2. It does not have the voltage detection function; 3. It does not have the circuit breaker's own health and operating status monitoring function. In other words, the existing vacuum circuit breaker lacks multi-dimensional fault safety monitoring, and the existing technology does not perform 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 breaker to adapt to the circuit breaker environment of complex circuits. Summary of the invention

[0003] One of the inventive purposes of the present invention is to provide a method and system for protecting a vacuum circuit breaker. The method and system are configured with an intelligent monitoring unit. The intelligent monitoring unit is used to obtain temperature data including 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 of the above different sensors are uploaded to the intelligent monitoring unit. The intelligent monitoring unit performs a comprehensive analysis based on the different types of data detected, thereby determining the safety performance of the vacuum circuit breaker and performing 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 obtain electromagnetic performance data of the vacuum circuit breaker and mechanical performance data of the circuit breaker respectively. The present invention accurately analyzes the safety performance of the vacuum circuit breaker based on multiple dimensions of the mechanical performance data and electromagnetic performance data of the vacuum circuit breaker. Compared with the traditional monitoring of only the voltage and current angles, the safety risk identification of the vacuum circuit breaker can be effectively improved.

[0005] Another object of the present invention is to provide a protection method and system for a vacuum circuit breaker. The method and system utilize voltage and current data detected by a Hall sensor. Compared with the traditional method of detecting voltage and current by a transformer, the present invention utilizes the Hall sensor to effectively reduce the risk of magnetic saturation in which the primary current and secondary current of the transformer are no longer proportional, thereby improving the accuracy of current and voltage detection of the vacuum circuit breaker.

[0006] In order to achieve at least one of the above-mentioned invention objects, the present invention further provides a protection method for a vacuum circuit breaker, the method comprising: 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 data 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 stroke displacement sensor is arranged 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 contact in the vacuum circuit breaker in real time during operation; The intelligent monitoring unit performs microcomputer protection after performing abnormal analysis based on the voltage data and current data detected by the line connected to the vacuum circuit breaker.

[0007] According to one of the preferred embodiments of the present invention, the method for analyzing the power quality data of the line connected to the vacuum circuit breaker includes: pre-acquiring 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 standard power parameters, and acquiring 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 include 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 comparative 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 imbalance, three-phase current imbalance and negative sequence voltage, which are used for analyzing the power quality of the line connected to the vacuum circuit breaker.

[0008] According to one of the preferred embodiments of the present invention, 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 state of the switch auxiliary contacts, and the control circuit voltage; wherein the three-phase current and voltage of the partial closing coil in 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.

[0009] 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 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 it exceeds 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, and calculating the frequency of the exceeding standard data, and using the detection data and frequency including the exceeding standard parameter data to calculate the power quality data of the line connected to the vacuum circuit breaker.

[0010] According to another preferred embodiment of the present invention, it is defined that n is the super-standard data of the corresponding type in the historical data of the line connected to the vacuum circuit breaker, wherein 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 corresponding type of over-standard parameters, 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, β is the adjustment parameter, and 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.

[0011] According to another preferred embodiment of the present invention, the vacuum circuit breaker microcomputer protection method includes: extracting the super-standard data of the line connected to the vacuum circuit breaker and judging the type of the super-standard data, and 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 includes: 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 includes general inverse time, very inverse time and extreme inverse time.

[0012] 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 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 the different types of over-standard data actually detected, obtaining the corresponding type of vacuum circuit breaker connected line fault, and executing the microcomputer protection of the corresponding vacuum circuit breaker connected line fault.

[0013] 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 overtravel of the vacuum circuit breaker operating mechanism 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 opening and closing speed according to the opening and closing speed, and obtaining the operating state of the vacuum circuit breaker motor; 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 weighted summation according to the stroke, overtravel, opening and closing speed, motor operating state, and temperature values ​​of the contacts and contact arms of the operating mechanism, and judging whether the vacuum circuit breaker needs mechanical maintenance according to the mechanical characteristic score.

[0014] According to another preferred embodiment of the present invention, a weighted summation calculation is performed based on the power quality data F and the mechanical characteristic score, and the result obtained by the weighted summation calculation is used to perform an overall performance analysis of the vacuum circuit breaker, and a fault judgment is performed according to the abnormal data of each dimension according to a preset fault type mapping list.

[0015] In order to achieve at least one of the above-mentioned objects of the invention, the present invention further provides a protection system for a vacuum circuit breaker, wherein the system executes the above-mentioned protection method for a vacuum circuit breaker.

[0016] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program is executed by a processor to implement the above-mentioned vacuum circuit breaker protection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic flow chart of a protection method for a vacuum circuit breaker of the present invention. DETAILED DESCRIPTION

[0018] 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 described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0019] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0020] Please combine Figure 1 The present invention provides a protection method and system for a vacuum circuit breaker, wherein the method mainly includes the following steps: first, a Hall voltage sensor, a Hall current sensor, and a temperature sensor for RFID passive detection need to be configured in the vacuum circuit breaker, wherein the Hall voltage sensor and the Hall current sensor are used to detect voltage and current in the vacuum circuit breaker under different states. Since the voltage sensor and the current sensor in the present invention use Hall devices to replace the transformer in the traditional technical solution, the shortcomings of the traditional transformer, such as short current tolerance accuracy curve and magnetic saturation, can be effectively reduced. The Hall voltage sensor, the Hall current sensor, and the temperature sensor for RFID passive detection are respectively connected to an intelligent monitoring unit for communication, wherein at least one processor is set in the intelligent monitoring unit, and the processor receives the 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 to which the vacuum circuit breaker is connected according to the voltage, current and temperature data. In addition, the present invention also configures a contact travel displacement sensor and a contact-contact arm passive temperature sensor 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 with the operating mechanism of the vacuum circuit breaker, mechanical faults can be predicted and fault maintenance can be performed 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 of the overall performance of the vacuum circuit breaker, thereby comprehensively analyzing the data of the vacuum circuit breaker.

[0021] Specifically, the method for analyzing the power quality data of the vacuum circuit breaker includes: obtaining in advance the power standard parameters of the line connected to the corresponding type of vacuum circuit breaker, wherein the power standard parameters include: 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 vacuum circuit breaker installed in the circuit, comparing and analyzing the historical detection data and the power standard parameters of the line connected to the corresponding vacuum circuit breaker, judging the difference between the historical detection data and the corresponding vacuum circuit breaker standard parameters, and using them 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 is working 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, wherein each model of the vacuum circuit breaker has its own different rated voltage, but when the rated voltage of the vacuum circuit breaker does not match its working 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 work reliably when the voltage fluctuates. The maximum voltage is used to indicate whether the fluctuation 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 AC voltage that the vacuum circuit breaker can withstand under the specified test conditions. This parameter reflects the insulation capacity 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 equipment can pass for a long time, that is, the rated current of the puller. This is also a basic parameter specified when designing the vacuum circuit breaker. When the difference between the actual detected current and the rated current is large, it means that the vacuum circuit breaker has poor adaptability in the circuit. The overcurrent release standard parameters with different delays and the standard parameters of rated short-circuit breaking capacity are respectively the segmented standard parameters with different delay settings, wherein different delays can be set according to the model of the vacuum circuit breaker, such as 1. Long delay action current (Ir1): usually set to (0.4-1) times the rated current; short delay action current (Ir2): some circuit breakers have a short delay function, and their action current is usually set to (0.4-15) times the rated current; instantaneous action current (Ir3): the instantaneous action current is usually set higher, and is used to quickly cut off the circuit when a serious short circuit fault occurs. In some other preferred embodiments of the present invention, the voltage and current calculation analysis based on the real-time detection of the line connected to the vacuum circuit breaker includes but is not limited to power factor, system frequency, voltage deviation, three-phase voltage, current imbalance, voltage fluctuation and flicker, capture and record transient waveforms, voltage surge and other data.

[0022] It should be noted that the present invention needs to obtain the historical data of the Hall voltage sensor, Hall current sensor and RFID passive detection temperature sensor of the line connected to the vacuum circuit breaker within a period of time, for example, it can be historical data in units of one week. After obtaining the historical data of the corresponding sensor, the following comparison operation is further performed to calculate the power quality of the corresponding vacuum circuit breaker: pre-configure the detection weights of different parameter types of the vacuum circuit breaker, and judge 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 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 it exceeds the standard parameter, the data of the over-standard parameter is marked, and the over-standard parameter data of the corresponding type of parameter in the historical data is extracted, and the frequency of the over-standard data is calculated, and the power quality data of the vacuum circuit breaker is calculated according to the detection data and frequency of the over-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 the degree of their influence on the electrical performance of the vacuum circuit breaker. When the deviation of the above historical detection data and the standard data is larger, the electrical performance of the vacuum circuit breaker is more affected, and the higher the weight coefficient of the corresponding detection type is, the greater the impact is.

[0023] Furthermore, we define w n is the super-standard data of the corresponding type in the historical data of the line connected to the vacuum circuit breaker, wherein 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 corresponding type of over-standard parameters, 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, β is the adjustment parameter, and 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.

[0024] In one of the preferred embodiments of the present invention, a power quality threshold F corresponding to the vacuum circuit breaker is preset. s , when the power quality data F of the line connected to the vacuum circuit breaker calculated by the corresponding vacuum circuit breaker is greater than the power quality threshold F s, it is determined that the corresponding vacuum circuit breaker currently has a safety risk, and the safety maintenance operation of the corresponding vacuum circuit breaker is performed, wherein the super-standard data of the vacuum circuit breaker is further extracted and the type of the super-standard data is determined, and different microcomputer protections of the vacuum circuit breaker are respectively performed according to the type of super-standard data. The microcomputer protection methods of the vacuum circuit breaker include but are not limited to: motor starting protection, quick break, time-limited quick break, overcurrent protection, zero-sequence overcurrent protection, overload protection, non-electrical quantity protection, bus charging protection, etc. The above-mentioned microcomputer protection is realized based on the microcomputer control device connected to the vacuum circuit breaker.

[0025] The maintenance operation method includes: pre-building a fault type mapping table of 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 vacuum circuit breaker is detected and it is determined that maintenance operation is required, the fault type mapping table of the vacuum circuit breaker is searched according to the different types of over-standard data actually detected, the corresponding type of vacuum circuit breaker fault is obtained, and the maintenance strategy of the corresponding vacuum circuit breaker fault is executed. The above fault type mapping list is pre-stored in the intelligent monitoring unit, and when the relevant sensor data is uploaded and the corresponding power quality is calculated, the possible fault data is extracted to perform maintenance operations on the relevant faults.

[0026] 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 partial closing coil in 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.

[0027] The monitoring method of the mechanical characteristics of the vacuum circuit breaker also includes: obtaining the stroke and overtravel of the vacuum circuit breaker operating mechanism according to the contact stroke displacement sensor, and calculating the corresponding operating mechanism opening and closing speed by obtaining the opening and closing time of the operating mechanism, and obtaining the motor operation state of the vacuum circuit breaker 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 value of the contact and contact arm of the operating mechanism; calculating the mechanical characteristic score of the vacuum circuit breaker by weighted summation according to the stroke, overtravel, opening and closing speed, motor operation state, contact and contact arm of the operating mechanism, and judging whether the vacuum circuit breaker needs mechanical maintenance according to the mechanical characteristic score. A weighted summation calculation is performed according to the power quality data F and the mechanical characteristic score, and the result obtained by the weighted summation calculation is used to perform the overall performance analysis of the vacuum circuit breaker, and the microcomputer protection of the vacuum circuit breaker is performed according to the abnormal data of each dimension according to the preset fault type mapping list.

[0028] The embodiments disclosed in the present invention, the process described above with reference to the flowchart can be implemented as a computer software program. The 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 a program code for executing the method shown in the flowchart. 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 the central processing unit (CPU), the above-mentioned functions defined in the method of the present application are executed. It should be noted that the above-mentioned computer-readable medium of the present application can be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium can be, for example, but not limited to, a system, device or device of an electrical, magnetic, optical, electromagnetic, infrared segment, or semiconductor, or any combination of the above. More specific examples of computer-readable storage media may 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 may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present application, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, electrical wire, optical cable, RF, etc., or any suitable combination of the foregoing.

[0029] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present invention. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0030] 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 functional and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the implementation methods of the present invention may be deformed or modified in any way.

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 data 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 stroke displacement sensor is arranged 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 contact in the vacuum circuit breaker in real time during operation; The intelligent monitoring unit performs microcomputer protection after performing abnormal analysis based on the voltage data and current data detected by the line connected to the vacuum circuit breaker.

2. A vacuum circuit breaker protection method according to claim 1, characterized in that: The method for analyzing the power quality data of the line connected to the vacuum circuit breaker includes: pre-acquiring 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 standard power parameters, and acquiring the historical detection data of the power parameters when the vacuum circuit breaker is installed in the circuit, wherein the historical detection data of the power parameters include current and voltage, comparing and analyzing the historical detection data with the power standard parameters of the line connected to the corresponding vacuum circuit breaker, wherein the comparative 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 imbalance, three-phase current imbalance and negative sequence voltage, which are used for analyzing the power quality of the line connected to the vacuum circuit breaker.

3. 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.

4. A vacuum circuit breaker protection method according to claim 1, characterized in that: The method for calculating the power quality of the line connected to the vacuum circuit breaker includes: pre-configuring 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 it exceeds 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.

5. A vacuum circuit breaker protection method according to claim 3, characterized in that: Define w n is the super-standard data of the corresponding type in the historical data of the line connected to the vacuum circuit breaker, wherein 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 corresponding type of over-standard parameters, then the calculation method of the power quality data F includes: F= , where σ n is the weight assignment for the corresponding detection parameter type, β is the adjustment parameter, and 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.

6. A vacuum circuit breaker protection method according to claim 4, 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.

7. A vacuum circuit breaker protection method according to claim 5, 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.

8. A vacuum circuit breaker protection method according to claim 6, 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, 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 motor of the vacuum circuit breaker according to the opening and closing speed; and configuring a passive temperature sensor in the operating mechanism of the vacuum circuit breaker for detecting the temperature values ​​of the contacts and contact arms of the operating mechanism; calculating the mechanical characteristic score of the vacuum circuit breaker by weighted summation according to the stroke, overtravel, opening and closing speed, motor operating state, and temperature values ​​of the contacts and contact arms of the operating mechanism, and judging whether the vacuum circuit breaker needs mechanical maintenance according to the mechanical characteristic score; performing weighted summation calculation according to the power quality data F and the mechanical characteristic score, and the result obtained by the weighted summation calculation is used to perform overall performance analysis of the vacuum circuit breaker, and performing fault judgment according to the abnormal data of each dimension according to a preset fault type mapping list.

9. 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 8.

10. 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 8.

Images