CN116908674B - Method and system for monitoring and predicting residual life of circuit breaker - Google Patents
Method and system for monitoring and predicting residual life of circuit breaker Download PDFInfo
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- CN116908674B CN116908674B CN202311168912.5A CN202311168912A CN116908674B CN 116908674 B CN116908674 B CN 116908674B CN 202311168912 A CN202311168912 A CN 202311168912A CN 116908674 B CN116908674 B CN 116908674B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a method and a system for monitoring and predicting the residual life of a circuit breaker, which belong to the technical field of circuit breakers, and the method comprises the following steps: the method comprises the steps that a sensor is used for monitoring and collecting current data of a circuit breaker in real time when the circuit breaker is disconnected under the working condition and under the short-circuit protection, recording data are formed, and the recording data and the current data are transmitted to an edge gateway; and calculating the sectioning time coefficient, the equivalent breaking times of the circuit breaker, the relative electric wear amount of the circuit breaker and the residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time by utilizing the edge gateway, and transmitting the equivalent breaking times of the circuit breaker, the relative electric wear amount of the circuit breaker and the residual life of the circuit breaker to a display unit for display. The system is a system which is correspondingly arranged for realizing the method; the invention solves the problem that the residual life of different types of low-voltage circuit breakers is difficult to accurately monitor and predict.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a method and a system for monitoring and predicting the residual life of a circuit breaker.
Background
The residual life of the low-voltage circuit breaker can reflect the breaking times of rated short-circuit current, embody the continuous breaking capacity of the circuit breaker without overhauling, but the electric life is shorter than the life of the body of the circuit breaker, and the electric life of the circuit breaker mainly depends on the contact components of the circuit breaker. Failure to accurately predict the electrical life of a circuit breaker may lead to blind overhaul and failure to effectively extend the life cycle of the equipment.
At present, the residual life of the low-voltage circuit breaker is rarely monitored and predicted on line. The main reasons are that the scheme has low standardization, high coupling degree and large realization difficulty, and is specifically characterized in that: on one hand, although the existing intelligent circuit breaker body can realize data acquisition and uploading, the accuracy of data acquisition of each circuit breaker is different, the acquired data items are not uniform, and the calculation difficulty of a theoretical model is high; on the other hand, since theoretical models of the remaining life calculation of the circuit breaker are not uniform, different theoretical models need to be configured with different data acquisition schemes. Secondly, the residual life theoretical model is a generalized model, and uniform data base and data precision are required for a plurality of low-voltage circuit breakers of different types and models.
Disclosure of Invention
According to the method and the system for monitoring and predicting the residual life of the circuit breaker, which are provided by the invention, the circuit breaker body is separated from the sensor for collecting the data of the circuit breaker, so that the sensor can monitor the current of different circuit breakers, the sensor is decoupled from the circuit breaker in height, the breaking time and the breaking current are accurately determined by simultaneously obtaining the recording data during breaking, and the problem that accurate residual life monitoring and prediction of different types of low-voltage circuit breakers are difficult to carry out is solved.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
in one aspect, the invention provides a method for monitoring and predicting the residual life of a circuit breaker, comprising the following steps:
s1, monitoring and collecting current data of a circuit breaker in real time under working conditions and under short-circuit protection, forming wave recording data according to a combtrade 99 standard, and transmitting the wave recording data and the current data to an edge gateway;
s2, calculating a sectioning time coefficient, equivalent breaking times of the circuit breaker, relative electric wear of the circuit breaker and residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time by utilizing the edge gateway, and transmitting the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker to a display unit;
and S3, displaying the equivalent breaking times of the circuit breaker, the relative electric abrasion loss of the circuit breaker and the residual life of the circuit breaker by using a display unit.
The beneficial effects of the invention are as follows: according to the method for monitoring the residual life of the circuit breaker, the circuit breaker body is separated from a sensor for collecting the characteristic data of the circuit breaker, under the condition that only current data of the circuit breaker under the working condition and short-circuit protection during opening are collected in real time, the rated short-circuit opening current of various low-voltage circuit breakers and the wave recording data of real-time opening waveforms are combined, so that accurate breaking time and breaking power can be obtained through analysis, the equivalent breaking times, the relative electric wear and the residual life of the circuit breaker are calculated for the various circuit breakers by utilizing an edge gateway, and the calculated results are displayed in real time by utilizing a display unit; the low-voltage circuit breaker characteristics to be collected only comprise two characteristic data, namely current data determined based on the recording data during opening, and the monitoring and accurate prediction of the residual life of the low-voltage circuit breakers of different specifications are realized by combining the specification data of the low-voltage circuit breakers of different specifications.
Further, the current data and the recording data are transmitted to the edge gateway by the sensor through Modbus rtu protocol; the recording data is transmitted to the edge gateway by adopting IEC103 protocol.
The beneficial effects of adopting the further scheme are as follows: the Modbus rtu protocol usually adopts RS-485 as a physical layer, and generally utilizes the serial port of a chip to realize the receiving and transmitting of data messages, and message data are communicated by adopting binary data, so that current data monitored by a sensor can be effectively transmitted to an edge gateway in a binary form, and the edge gateway is convenient for analyzing and processing the current data.
Further, the calculating to obtain the segment time coefficient, the equivalent turn-off times of the breaker, the relative electric abrasion loss of the breaker and the residual life of the breaker based on the wave recording data, the current data, the rated short-circuit turn-off current and the rated segment time comprises the following steps:
a1, analyzing waveform data to obtain breaking time coefficients:
the calculation expression of the breaking time coefficient is as follows:
wherein,representing the breaking time coefficient>Indicating the end of the breaking time, & lt + & gt>Indicates the start breaking time,/>Representing rated breaking time;
a2, calculating the equivalent breaking times of the breaker based on current data, rated short-circuit breaking current and breaking time coefficient;
the calculation expression of the equivalent switching-on and switching-off times of the circuit breaker is as follows:
wherein,representing the equivalent turn-on and turn-off times of the breaker, +.>Indicating rated short-circuit on-off current, < >>The current of the breaker when the breaker is disconnected under the working condition and under the short-circuit protection is represented;
a3, calculating the relative electric abrasion loss of the circuit breaker based on the equivalent switching-on and switching-off times, current data and rated short-circuit switching-off current of the circuit breaker;
the calculation expression of the relative electric abrasion loss of the circuit breaker is as follows:
wherein,indicating the relative electric abrasion quantity of the circuit breaker;
a4, calculating the relative electric abrasion loss of the circuit breaker to obtain the residual life of the circuit breaker;
the calculation expression of the residual life of the circuit breaker is as follows:
wherein,indicating the remaining life of the circuit breaker, < > and->Indicating the initial relative lifetime of the circuit breaker, < >>Indicating the relative electrical wear of the ith circuit breaker, wherein +.>。
The beneficial effects of adopting the further scheme are as follows: the invention determines accurate breaking time and breaking current based on analysis of the wave recording data, and provides a basis for obtaining more accurate equivalent breaking times; according to the invention, the equivalent switching-on and switching-off times of the low-voltage circuit breaker and the relative electric wear of the circuit breaker are calculated according to the proportion of the current size of the circuit breaker during switching-off to the rated short-circuit switching-on and switching-off current acquired by the sensor, and under the condition that only two characteristic data of current and the recording data of switching-off waveforms are acquired, the characteristic data is still related to the specification of the low-voltage circuit breaker, so that the accuracy of the equivalent switching-on and switching-off times of the circuit breaker is effectively improved, the acquisition characteristic is convenient, and the residual life of the circuit breaker can be accurately predicted.
Further, the edge gateway transmits the equivalent number of circuit breaker open times, the relative electrical wear of the circuit breaker and the remaining life of the circuit breaker to the display unit based on the Modbus tcp protocol.
The beneficial effects of adopting the further scheme are as follows: the Modbus TCP protocol is a Modbus variant version, uses a TCP/IP network for communication, is connected through a 502 port, and the transmitted message does not need additional checksum calculation, and automatically realizes CRC32 data integrity check through an Ethernet bottom layer.
On the other hand, the invention also provides a prediction system based on the method for monitoring and predicting the residual life of the circuit breaker, which comprises the following steps:
the sensor is used for monitoring and collecting current data of the breaker in real time when the breaker is disconnected under working conditions and under short-circuit protection, forming wave recording data according to a combtrade 99 standard, and transmitting the wave recording data and the current data to the edge gateway;
the edge gateway is used for calculating and obtaining a sectioning time coefficient, equivalent breaking times of the circuit breaker, relative electric wear of the circuit breaker and residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time, and transmitting the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker to the display unit;
and the display unit is used for displaying the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker.
Further, the edge gateway includes:
the first sub-module is used for analyzing the waveform data to obtain a breaking time coefficient:
the calculation expression of the breaking time coefficient is as follows:
wherein,representing the breaking time coefficient>Indicating the end of the breaking time, & lt + & gt>Indicates the start breaking time,/>Representing rated breaking time;
the second sub-module is used for calculating the equivalent breaking times of the breaker based on the current data, the rated short-circuit breaking current and the breaking time coefficient;
the calculation expression of the equivalent switching-on and switching-off times of the circuit breaker is as follows:
wherein,representing the equivalent turn-on and turn-off times of the breaker, +.>Indicating rated short-circuit on-off current, < >>The current of the breaker when the breaker is disconnected under the working condition and under the short-circuit protection is represented;
the third sub-module is used for calculating the relative electric abrasion loss of the circuit breaker based on the equivalent switching-on and switching-off times of the circuit breaker, current data and rated short-circuit switching-on and switching-off current;
the calculation expression of the relative electric abrasion loss of the circuit breaker is as follows:
wherein,indicating the relative electric abrasion quantity of the circuit breaker;
the fourth sub-module is used for calculating the residual life of the circuit breaker based on the relative electric abrasion loss of the circuit breaker;
the calculation expression of the residual life of the circuit breaker is as follows:
wherein,indicating the remaining life of the circuit breaker, < > and->Indicating the initial relative lifetime of the circuit breaker, < >>Indicating the relative electrical wear of the ith circuit breaker, wherein +.>；
And the fifth sub-module is used for transmitting the equivalent breaking times of the circuit breaker, the relative electric abrasion loss of the circuit breaker and the residual service life of the circuit breaker to the display unit.
The beneficial effects of the invention are as follows: the system based on the method for monitoring and predicting the residual life of the circuit breaker is correspondingly arranged for the method for monitoring and predicting the residual life of the circuit breaker, is used for realizing the method, and has the beneficial effects corresponding to the method.
Other advantages that are also present with respect to the present invention will be more detailed in the following examples.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart illustrating steps of a method for monitoring and predicting remaining life of a circuit breaker according to embodiment 1 of the present invention.
Fig. 2 is a block diagram of a prediction system based on a method for monitoring and predicting remaining life of a circuit breaker according to embodiment 2 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
Example 1:
as shown in fig. 1, in one embodiment of the present invention, the present invention provides a method for monitoring and predicting remaining life of a circuit breaker, comprising the steps of:
s1, monitoring and collecting current data of a circuit breaker in real time under working conditions and under short-circuit protection, forming wave recording data according to a combtrade 99 standard, and transmitting the wave recording data and the current data to an edge gateway;
in the embodiment, the current data and the recording data are transmitted from the sensor to the edge gateway through Modbus rtu protocol; the recording data is transmitted to the edge gateway by adopting IEC103 protocol. The IEC103 protocol generally adopts an unbalanced communication mode, which supports a master station to access a plurality of substation devices at the same time, the substations are distinguished by addresses, and the IEC103 protocol has a plurality of different services, and the message structure and the message length of each service are different.
S2, calculating a sectioning time coefficient, equivalent breaking times of the circuit breaker, relative electric wear of the circuit breaker and residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time by utilizing the edge gateway, and transmitting the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker to a display unit;
the method for calculating the sectioning time coefficient, the equivalent breaking times of the circuit breaker, the relative electric abrasion loss of the circuit breaker and the residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time comprises the following steps:
a1, analyzing waveform data to obtain breaking time coefficients:
the calculation expression of the breaking time coefficient is as follows:
wherein,representing the breaking time coefficient>Indicating the end of the breaking time, & lt + & gt>Indicates the start breaking time,/>Representing rated breaking time;
a2, calculating the equivalent breaking times of the breaker based on current data, rated short-circuit breaking current and breaking time coefficient;
the calculation expression of the equivalent switching-on and switching-off times of the circuit breaker is as follows:
wherein,representing the equivalent turn-on and turn-off times of the breaker, +.>Indicating rated short-circuit on-off current, < >>The current of the breaker when the breaker is disconnected under the working condition and under the short-circuit protection is represented;
a3, calculating the relative electric abrasion loss of the circuit breaker based on the equivalent switching-on and switching-off times, current data and rated short-circuit switching-off current of the circuit breaker;
the calculation expression of the relative electric abrasion loss of the circuit breaker is as follows:
wherein,indicating the relative electric abrasion quantity of the circuit breaker;
a4, calculating the residual life of the circuit breaker based on the relative electric abrasion loss of the circuit breaker;
the calculation expression of the residual life of the circuit breaker is as follows:
wherein,indicating the remaining life of the circuit breaker, < > and->Indicating the initial relative lifetime of the circuit breaker, < >>Indicating the relative electrical wear of the ith circuit breaker, wherein +.>. Brand new nothingInitial relative life of circuit breaker of low-voltage circuit breaker of enablingIn this embodiment, the remaining life of the circuit breaker obtained finally is a fraction of 0 or more and 1 or less, the remaining life of the circuit breaker can be obtained by percentage conversion, and the remaining number of times of breaking can be predicted based on the remaining life of the circuit breaker obtained by percentage conversion multiplied by the rated number of times of breaking in the specification of the low-voltage circuit breaker.
In this embodiment, the edge gateway transmits the equivalent number of circuit breaker open/close times, the relative electrical wear of the circuit breaker, and the remaining life of the circuit breaker to the display unit based on the Modbus tcp protocol.
And S3, displaying the equivalent breaking times of the circuit breaker, the relative electric abrasion loss of the circuit breaker and the residual life of the circuit breaker by using a display unit.
Example 2:
in another embodiment of the present invention, as shown in fig. 2, the present invention further provides a prediction system based on a method for monitoring and predicting remaining life of a circuit breaker, including:
the sensor is used for monitoring and collecting current data of the breaker in real time when the breaker is disconnected under working conditions and under short-circuit protection, forming wave recording data according to a combtrade 99 standard, and transmitting the wave recording data and the current data to the edge gateway;
the edge gateway is used for calculating and obtaining a sectioning time coefficient, equivalent breaking times of the circuit breaker, relative electric wear of the circuit breaker and residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time, and transmitting the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker to the display unit;
the edge gateway comprises:
the first sub-module is used for analyzing the waveform data to obtain a breaking time coefficient:
the calculation expression of the breaking time coefficient is as follows:
wherein,representing the breaking time coefficient>Indicating the end of the breaking time, & lt + & gt>Indicates the start breaking time,/>Representing rated breaking time;
the second sub-module is used for calculating the equivalent breaking times of the breaker based on the current data, the rated short-circuit breaking current and the breaking time coefficient;
the calculation expression of the equivalent switching-on and switching-off times of the circuit breaker is as follows:
wherein,representing the equivalent turn-on and turn-off times of the breaker, +.>Indicating rated short-circuit on-off current, < >>The current of the breaker when the breaker is disconnected under the working condition and under the short-circuit protection is represented;
the third sub-module is used for calculating the relative electric abrasion loss of the circuit breaker based on the equivalent switching-on and switching-off times of the circuit breaker, current data and rated short-circuit switching-on and switching-off current;
the calculation expression of the relative electric abrasion loss of the circuit breaker is as follows:
wherein,indicating the relative electric abrasion quantity of the circuit breaker;
the fourth sub-module is used for calculating the residual life of the circuit breaker based on the relative electric abrasion loss of the circuit breaker;
the calculation expression of the residual life of the circuit breaker is as follows:
wherein,indicating the remaining life of the circuit breaker, < > and->Indicating the initial relative lifetime of the circuit breaker, < >>Indicating the relative electrical wear of the ith circuit breaker, wherein +.>；
And the fifth sub-module is used for transmitting the equivalent breaking times of the circuit breaker, the relative electric abrasion loss of the circuit breaker and the residual service life of the circuit breaker to the display unit.
And the display unit is used for displaying the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.
Claims (4)
1. The method for monitoring and predicting the residual life of the circuit breaker is characterized by comprising the following steps of:
s1, monitoring and collecting current data of a circuit breaker in real time under working conditions and under short-circuit protection, forming wave recording data according to a combtrade 99 standard, and transmitting the wave recording data and the current data to an edge gateway;
s2, calculating a sectioning time coefficient, equivalent breaking times of the circuit breaker, relative electric wear of the circuit breaker and residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time by utilizing the edge gateway, and transmitting the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker to a display unit;
the method for calculating the sectioning time coefficient, the equivalent breaking times of the circuit breaker, the relative electric abrasion loss of the circuit breaker and the residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time comprises the following steps:
a1, analyzing waveform data to obtain breaking time coefficients:
the calculation expression of the breaking time coefficient is as follows:
wherein,representing the breaking time coefficient>Indicating the end of the breaking time, & lt + & gt>Indicates the start breaking time,/>Representing rated breaking time;
a2, calculating the equivalent breaking times of the breaker based on current data, rated short-circuit breaking current and breaking time coefficient;
the calculation expression of the equivalent switching-on and switching-off times of the circuit breaker is as follows:
wherein,representing the equivalent turn-on and turn-off times of the breaker, +.>Indicating rated short-circuit on-off current, < >>The current of the breaker when the breaker is disconnected under the working condition and under the short-circuit protection is represented;
a3, calculating the relative electric abrasion loss of the circuit breaker based on the equivalent switching-on and switching-off times, current data and rated short-circuit switching-off current of the circuit breaker;
the calculation expression of the relative electric abrasion loss of the circuit breaker is as follows:
wherein,indicating the relative electric abrasion quantity of the circuit breaker;
a4, calculating the residual life of the circuit breaker based on the relative electric abrasion loss of the circuit breaker;
the calculation expression of the residual life of the circuit breaker is as follows:
wherein,indicating the remaining life of the circuit breaker, < > and->Indicating the initial relative lifetime of the circuit breaker, < >>Represent the firstiThe relative electrical wear of the secondary circuit breaker, wherein +.>；
And S3, displaying the equivalent breaking times of the circuit breaker, the relative electric abrasion loss of the circuit breaker and the residual life of the circuit breaker by using a display unit.
2. The method of claim 1, wherein the current data is transmitted by the sensor to the edge gateway via Modbus rtu protocol; the recording data is transmitted to the edge gateway by adopting IEC103 protocol.
3. The method of claim 1, wherein the edge gateway transmits the number of equivalent circuit breaker opens, the amount of relative electrical wear of the circuit breaker, and the remaining life of the circuit breaker to the display unit based on a Modbus tcp protocol.
4. A prediction system based on the method for monitoring and predicting the remaining life of a circuit breaker according to any one of claims 1 to 3, characterized by comprising:
the sensor is used for monitoring and collecting current data of the breaker in real time when the breaker is disconnected under working conditions and under short-circuit protection, forming wave recording data according to a combtrade 99 standard, and transmitting the wave recording data and the current data to the edge gateway;
the edge gateway is used for calculating and obtaining a sectioning time coefficient, equivalent breaking times of the circuit breaker, relative electric wear of the circuit breaker and residual life of the circuit breaker based on the wave recording data, the current data, the rated short-circuit breaking current and the rated sectioning time, and transmitting the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker to the display unit;
the edge gateway comprises:
the first sub-module is used for analyzing the waveform data to obtain a breaking time coefficient:
the calculation expression of the breaking time coefficient is as follows:
wherein,representing the breaking time coefficient>Indicating the end of the breaking time, & lt + & gt>Indicates the start breaking time,/>Representing rated breaking time;
the second sub-module is used for calculating the equivalent breaking times of the breaker based on the current data, the rated short-circuit breaking current and the breaking time coefficient;
the calculation expression of the equivalent switching-on and switching-off times of the circuit breaker is as follows:
wherein,representing the equivalent turn-on and turn-off times of the breaker, +.>Indicating rated short-circuit on-off current, < >>The current of the breaker when the breaker is disconnected under the working condition and under the short-circuit protection is represented;
the third sub-module is used for calculating the relative electric abrasion loss of the circuit breaker based on the equivalent switching-on and switching-off times of the circuit breaker, current data and rated short-circuit switching-on and switching-off current;
the calculation expression of the relative electric abrasion loss of the circuit breaker is as follows:
wherein,indicating the relative electric abrasion quantity of the circuit breaker;
the fourth sub-module is used for calculating the residual life of the circuit breaker based on the relative electric abrasion loss of the circuit breaker;
the calculation expression of the residual life of the circuit breaker is as follows:
wherein,indicating the remaining life of the circuit breaker, < > and->Indicating the initial relative lifetime of the circuit breaker, < >>Represent the firstiThe relative electrical wear of the secondary circuit breaker, wherein +.>；
The fifth submodule is used for transmitting equivalent breaking times of the circuit breaker, relative electric wear of the circuit breaker and residual life of the circuit breaker to the display unit;
and the display unit is used for displaying the equivalent breaking times of the circuit breaker, the relative electric wear of the circuit breaker and the residual life of the circuit breaker.
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