A circuit breaker residual electrical life evaluation method and apparatus based on charge quantity

Abstract

The application provides a circuit breaker residual electric life evaluation method and device based on charge quantity, determines the charge quantity passed during breaking arc and pre-breakdown arc in the number of opening and closing consumed by a first circuit breaker, calculates the charge quantity passed before the first breaking failure of the first circuit breaker, and evaluates the residual electric life of a second circuit breaker. The charge quantity passed before the first breaking failure of the first circuit breaker provides an actual basis for the overall evaluation method, and the evaluation of the residual electric life of the circuit breaker is realized in combination with the charge quantity passed during breaking arc and pre-breakdown arc in the number of opening and closing consumed by the first circuit breaker, so that the evaluation reliability is greatly improved. The application can accurately evaluate the residual electric life of the circuit breaker, facilitate active maintenance or replacement of the circuit breaker according to the residual electric life, reduce the influence of temporary power failure, improve the availability of direct current energy in a converter station, and improve the stability of a direct current power transmission system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current transmission, in particular to a circuit breaker residual electric life evaluation method and device based on electric charge. BACKGROUND

[0002] In recent years, with the rapid development of clean, low-carbon, safe and efficient new energy power generation technology, direct current transmission systems with large transmission capacity and high transmission efficiency are rapidly developing and widely used year by year. With the increase of short-term operation life or the number of actions, the key components of the circuit breaker used for switching the filter in the converter station, such as the arc extinguishing chamber, mechanism and external insulation, are prone to failure, which has an adverse effect on the safety and stability of the direct current transmission system.

[0003] The electric life of the circuit breaker (such as sulfur hexafluoride SF6) can generally meet 16 or 20 times of 100% short-circuit current breaking, but due to the frequent switching of the circuit breaker, high-amplitude high-frequency inrush current will be generated during the closing process, and the contacts and nozzles of the arc extinguishing chamber will be ablated and mechanically worn under the cumulative closing arc ablation and mechanical wear, which will seriously reduce the breaking performance. In the breaking process, the breaking current is mostly capacitive small current, which is prone to pre-breakdown and even explosion.

[0004] In order to ensure the normal operation of the circuit breaker and the direct current transmission system, the residual electric life of the circuit breaker needs to be evaluated. Related technologies mostly realize the evaluation of the residual electric life of the circuit breaker based on statistical models such as neural networks, cloud models, and grey GM(1,1) models. However, since most of these statistical models are constructed based on empirical formulas, they lack sufficient practical basis, resulting in very low reliability of the evaluation results. SUMMARY

[0005] In order to solve the problem of low reliability in the prior art, the present application provides a circuit breaker residual electric life evaluation method based on electric charge, which can include: determining the electric charge passing through during the breaking arc period and the pre-breakdown arc period in the consumed opening and closing times of the first circuit breaker in the operating state according to the consumed opening and closing times of the first circuit breaker in the operating state. Calculate the electric charge passing through before the first breaking failure of the first circuit breaker according to the consumed breaking times in the first circuit breaker experiment. Evaluate the residual electric life of the second circuit breaker according to the electric charge passing through during the breaking arc period and the pre-breakdown arc period in the consumed opening and closing times of the first circuit breaker and the electric charge passing through before the first breaking failure of the first circuit breaker.

[0006] In some possible implementation manners, the determination of the electric charge passing through during the breaking arc period and the pre-breakdown arc period in the consumed opening and closing times of the first circuit breaker in the operating state according to the consumed opening and closing times of the first circuit breaker in the operating state includes:

[0007] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is determined based on the current passing through the first circuit breaker in its operating state or based on the number of closing operations consumed by the first circuit breaker.

[0008] The amount of charge passing through the first circuit breaker during the arc breaking process is calculated based on the number of times the first circuit breaker has been interrupted while in operation.

[0009] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is added together with the amount of charge passing through the first circuit breaker during the arc breaking period while it is in operation to obtain the amount of charge passing through the arc breaking period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker.

[0010] Furthermore, the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while in operation is determined based on the current passing through the first circuit breaker in its operating state or based on the number of closing operations already completed by the first circuit breaker, including:

[0011] The discrete data integration method is used to integrate the current passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation, to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation. Alternatively, the average amount of charge passing through the first circuit breaker during a single pre-breakdown arcing period is determined based on the probability distribution diagram of the amount of charge passing through the first circuit breaker during a single pre-breakdown arcing period; and the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is determined based on the number of closing operations already completed by the first circuit breaker and the average amount of charge passing through the first circuit breaker during a single pre-breakdown arcing period.

[0012] Optionally, the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state satisfies:

[0013] Q hc1 =Q 1* ×N hc1

[0014] Among them, Q hc1 Q represents the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation. 1* N represents the average charge passing through the first circuit breaker during a single pre-breakdown arcing event. hc1 This indicates the number of times the first circuit breaker has been closed.

[0015] For example, calculating the amount of charge passing through the first circuit breaker during arc interruption in its operating state based on the number of interruptions consumed by the first circuit breaker in its operating state includes:

[0016] The amount of charge passing through the first circuit breaker during arc breaking is calculated based on the number of interruptions consumed by the first circuit breaker in operation and the average value of the AC component amplitude of the current during all arc breaking periods in the first circuit breaker in operation.

[0017] In one example, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through the first circuit breaker during the interruption of arcing in the operating state satisfies:

[0018] Q ho1 =N ho1 ×Q o1

[0019] Among them, Q ho1 N represents the amount of charge passing through the first circuit breaker during the interruption of arcing while it is in operation. ho1 Q represents the number of interruptions that the first circuit breaker has performed while in operation; o1 This indicates the amount of charge passing through the first circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h1 I represents the arc-breaking time of the first circuit breaker. cm1 ΔI1 represents the average value of the AC component amplitude of the current during all arc interruptions when the first circuit breaker is in operation, ΔI1 represents the average value of the DC component amplitude of the current during all arc interruptions when the first circuit breaker is in operation, and ω represents the system frequency.

[0020] In another example, if the first circuit breaker is one that does not perform phase-selective interruption, the amount of charge passing through the first circuit breaker during the interruption of arcing in the operating state satisfies:

[0021]

[0022] Where M1 represents the number of current ranges of the first circuit breaker, Q oi1 This indicates that the first circuit breaker is in operation state t. hi1 The corresponding charge amount passing through during a single arc interruption, t hi1 Q represents the arc-breaking time of the first circuit breaker in the i-th interval under operating conditions; oi1 satisfy

[0023] In some other possible implementations, the amount of charge that passed before the first circuit breaker failed to open is calculated based on the number of openings consumed in the first circuit breaker experiment, including:

[0024] The discrete data integration method was used to integrate the current passing through the first circuit breaker during the pre-breakdown arcing period to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period.

[0025] Calculate the amount of charge that passed during the arc breaking period in the first circuit breaker experiment based on the number of breaking cycles consumed in the first circuit breaker experiment.

[0026] The amount of charge passing during the pre-breakdown arcing period in the first circuit breaker experiment is added together with the amount of charge passing during the arcing interruption period in the first circuit breaker experiment to obtain the amount of charge passing before the first interruption failure of the first circuit breaker.

[0027] Optionally, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through during the arc interruption period in the first circuit breaker test satisfies:

[0028] Q eo =N eo ×Q o1

[0029] Among them, Q eo N represents the amount of charge that passed during the arc interruption in the first circuit breaker experiment; eo This indicates the number of times the circuit breaker has been switched during the first circuit breaker test.

[0030] If the first circuit breaker is a circuit breaker that performs phase-selective interruption, the amount of charge passing through during the arc interruption period of the first circuit breaker test satisfies:

[0031]

[0032] For example, the remaining electrical life of the second circuit breaker satisfies:

[0033]

[0034] Where, N s2 Indicates the remaining electrical life of the second circuit breaker; Q h1 This represents the amount of charge that passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; Q e Q represents the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; h2 This represents the amount of charge passed during the interruption of the arcing period and the pre-breakdown arcing period in the number of opening and closing operations consumed by the second circuit breaker, satisfying Q. h2 =Q ho2 +Q hc2 Q ho2 Q represents the amount of charge passing through the second circuit breaker during the interruption of arcing while it is in operation. hc2 This indicates the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation; N h2 This indicates the number of times the second circuit breaker has been switched on and off while in operation.

[0035] The amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation is determined in the following way:

[0036] Method 1: The current passing through the second circuit breaker during the pre-breakdown arcing period is obtained by integrating the discrete data integration method.

[0037] Method 2: Determine the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the probability distribution diagram of the charge passing through the second circuit breaker during a single pre-breakdown arcing period; and obtain the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the number of closing cycles consumed by the second circuit breaker.

[0038] Furthermore, if the second circuit breaker is a phase-selective interrupter, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0039] Q ho2 =N ho2 ×Q o2

[0040] Where, N ho2 This indicates the number of interruptions that the second circuit breaker has performed while in operation; Q o2 This indicates the amount of charge passing through the second circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h2 Indicates the arc-breaking time of the second circuit breaker, I cm2 ΔI2 represents the average value of the AC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, ΔI2 represents the average value of the DC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, and ω represents the system frequency.

[0041] If the second circuit breaker is a circuit breaker without phase-selective interruption, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0042]

[0043] Where M2 represents the number of current zones of the second circuit breaker, Q oi2 This indicates that the second circuit breaker is in operation. hi2 The corresponding charge amount passing through during a single arc interruption, t hi2 Q represents the arc-breaking time of the second circuit breaker in the i-th interval under operating conditions; oi2 satisfy

[0044] For example, the amount of charge passing through the second circuit breaker during pre-breakdown arcing in the operating state satisfies:

[0045] Q hc2 =Q 2* ×N hc2

[0046] Among them, Q hc2 Q represents the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation. 2* N represents the average charge passing through the second circuit breaker during a single pre-breakdown arcing event. hc2 This indicates the number of times the second circuit breaker has been closed.

[0047] Optionally, the evaluation method provided in this application further includes: evaluating the remaining electrical life of the first circuit breaker based on the amount of charge passed during the interruption of arcing and the pre-breakdown arcing in the number of opening and closing cycles consumed by the first circuit breaker, the amount of charge passed before the first interruption failure of the first circuit breaker, and the number of opening and closing cycles consumed by the first circuit breaker in operation.

[0048] Optionally, the remaining electrical life of the first circuit breaker satisfies:

[0049]

[0050] Where, N s1 Q represents the remaining electrical life of the first circuit breaker; h1 This represents the amount of charge that passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; Q e N represents the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; h1 This indicates the number of times the first circuit breaker has been switched on and off while it is in operation.

[0051] Furthermore, this application also provides a circuit breaker residual life assessment device based on charge quantity, comprising:

[0052] The determination module is used to determine the amount of charge passing through the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker in operation.

[0053] The calculation module is used to calculate the amount of charge that passed before the first circuit breaker failed to open, based on the number of openings consumed in the first circuit breaker experiment.

[0054] The first evaluation module is used to evaluate the remaining electrical life of the second circuit breaker based on the amount of charge passed during the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker and the amount of charge passed before the first circuit breaker failed to interrupt for the first time.

[0055] In some possible implementations, the determination module is used for:

[0056] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is determined based on the current passing through the first circuit breaker in the operating state or based on the number of closing operations consumed by the first circuit breaker.

[0057] The amount of charge passing through the first circuit breaker during the arc breaking process is calculated based on the number of breaking operations consumed by the first circuit breaker in operation.

[0058] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is added together with the amount of charge passing through the first circuit breaker during the arc breaking period while it is in operation to obtain the amount of charge passing through the arc breaking period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker.

[0059] Furthermore, the determination module is used for:

[0060] The current passing through the first circuit breaker during the pre-breakdown arcing period in the operating state is integrated using the discrete data integration method to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state; or,

[0061] Based on the probability distribution diagram of the charge passing through the first circuit breaker during a single pre-breakdown arcing, the average charge passing through the first circuit breaker during a single pre-breakdown arcing is determined; and based on the number of closing operations consumed by the first circuit breaker and the average charge passing through the first circuit breaker during a single pre-breakdown arcing, the charge passing through the first circuit breaker during the pre-breakdown arcing in its operating state is determined.

[0062] Among them, the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state satisfies:

[0063] Q hc1 =Q 1* ×N hc1

[0064] Among them, Q hc1 Q represents the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation. 1* N represents the average charge passing through the first circuit breaker during a single pre-breakdown arcing event. hc1 This indicates the number of times the first circuit breaker has been closed.

[0065] Optionally, the determination module is used for:

[0066] The amount of charge passing through the first circuit breaker during arc breaking is calculated based on the number of interruptions consumed by the first circuit breaker in operation and the average value of the AC component amplitude of the current during all arc breaking periods in the first circuit breaker in operation.

[0067] On the one hand, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through the first circuit breaker during the interruption of arcing in operation satisfies the following:

[0068] Q ho1 =N ho1 ×Q o1

[0069] Among them, Q ho1 N represents the amount of charge passing through the first circuit breaker during the interruption of arcing while it is in operation. ho1 Q represents the number of interruptions that the first circuit breaker has performed while in operation; o1 This indicates the amount of charge passing through the first circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h1 I represents the arc-breaking time of the first circuit breaker. cm1 ΔI1 represents the average value of the AC component amplitude of the current during all arc breaking periods when the first circuit breaker is in operation, ω represents the average value of the DC component amplitude of the current during all arc breaking periods when the first circuit breaker is in operation, and ω represents the system frequency.

[0070] On the other hand, if the first circuit breaker is a circuit breaker that does not employ phase-selective interruption, the amount of charge passing through the first circuit breaker during the arc interruption in operation satisfies the following:

[0071]

[0072] Where M1 represents the number of current ranges of the first circuit breaker, Q oi1 This indicates that the first circuit breaker is in operation state t. hi1 The corresponding charge amount passing through during a single arc interruption, t hi1 Q represents the arc-breaking time of the first circuit breaker in the i-th interval under operating conditions; oi1 satisfy

[0073] In some other possible implementations, the computation module is used for:

[0074] The current passing through the first circuit breaker during the pre-breakdown arcing period is integrated using the discrete data integration method to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period.

[0075] Calculate the amount of charge that passed during the arc breaking period in the first circuit breaker test based on the number of breaks consumed in the first circuit breaker test;

[0076] The amount of charge passing during the pre-breakdown arcing period in the first circuit breaker experiment is added together with the amount of charge passing during the arcing interruption period in the first circuit breaker experiment to obtain the amount of charge passing before the first interruption failure of the first circuit breaker.

[0077] Optionally, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through during the arc interruption period in the first circuit breaker test satisfies:

[0078] Q eo =N eo ×Q o1

[0079] Among them, Q eo N represents the amount of charge that passed during the arc interruption in the first circuit breaker experiment; eo This indicates the number of interruptions that have been performed in the first circuit breaker test;

[0080] If the first circuit breaker is a circuit breaker that performs phase-selective interruption, the amount of charge passing through during the arc interruption period of the first circuit breaker test satisfies:

[0081]

[0082] The first evaluation module evaluates the remaining electrical life of the second circuit breaker according to the following formula (that is, the remaining electrical life of the second circuit breaker satisfies the following formula):

[0083]

[0084] Where, N s2 Indicates the remaining electrical life of the second circuit breaker; Q h1 This represents the amount of charge that passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; Q e Q represents the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; h2 This represents the amount of charge passed during the interruption of the arcing period and the pre-breakdown arcing period in the number of opening and closing operations consumed by the second circuit breaker, satisfying Q. h2 =Q ho2 +Q hc2 Q ho2 Q represents the amount of charge passing through the second circuit breaker during the interruption of arcing while it is in operation. hc2 This indicates the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation; N h2 This indicates the number of times the second circuit breaker has been switched on and off while in operation.

[0085] The first evaluation module determines the amount of charge passing through the second circuit breaker during pre-breakdown arcing in the operating state using the following method:

[0086] Method 1: The current passing through the second circuit breaker during the pre-breakdown arcing period is obtained by integrating the discrete data integration method.

[0087] Method 2: Determine the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the probability distribution diagram of the charge passing through the second circuit breaker during a single pre-breakdown arcing period; and obtain the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the number of closing cycles consumed by the second circuit breaker.

[0088] Optionally, the first evaluation module determines the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period in the operating state using the following formula (i.e., the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period in the operating state satisfies the following formula):

[0089] Q hc2 =Q 2* ×N hc2

[0090] Among them, Q hc2 Q represents the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation. 2* N represents the average charge passing through the second circuit breaker during a single pre-breakdown arcing event. hc2 This indicates the number of times the second circuit breaker has been closed.

[0091] If the second circuit breaker is a phase-selective interrupter, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0092] Q ho2 =N ho2 ×Q o2

[0093] Where, N ho2 This indicates the number of interruptions that the second circuit breaker has performed while in operation; Q o2 This indicates the amount of charge passing through the second circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h2 Indicates the arc-breaking time of the second circuit breaker, I cm2 ΔI2 represents the average value of the AC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, ΔI2 represents the average value of the DC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, and ω represents the system frequency.

[0094] If the second circuit breaker is a circuit breaker without phase-selective interruption, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0095]

[0096] Where M2 represents the number of current zones of the second circuit breaker, Q oi2 This indicates that the second circuit breaker is in operation. hi2 The corresponding charge amount passing through during a single arc interruption, t hi2 Q represents the arc-breaking time of the second circuit breaker in the i-th interval under operating conditions; oi2 satisfy

[0097] Optionally, the evaluation device may also include:

[0098] The second evaluation module is used to evaluate the remaining electrical life of the first circuit breaker based on the amount of charge passed during the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker, the amount of charge passed before the first interruption failure of the first circuit breaker, and the number of opening and closing cycles consumed by the first circuit breaker in operation.

[0099] Specifically, the second evaluation module evaluates the remaining electrical life of the first circuit breaker using the following formula (i.e., the remaining electrical life of the first circuit breaker satisfies the following formula):

[0100]

[0101] Where, N s1 Q represents the remaining electrical life of the first circuit breaker; h1 This represents the amount of charge that passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; Q e N represents the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; h1 This indicates the number of times the first circuit breaker has been switched on and off while it is in operation.

[0102] In another aspect, this application also provides a computer device, including: one or more processors.

[0103] A processor is used to execute one or more programs.

[0104] When one or more programs are executed by one or more processors, the evaluation method described above is implemented.

[0105] Furthermore, this application also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, it implements the evaluation method described above.

[0106] Compared with the prior art, the beneficial effects of this application are as follows:

[0107] The method for assessing the remaining electrical life of a circuit breaker based on charge quantity provided in this application determines the amount of charge passing through the arc-breaking and pre-breakdown arc-breaking periods during the number of opening and closing operations of the first circuit breaker in operation. The amount of charge passing through the first circuit breaker before its first breaking failure is calculated based on the number of breaking operations conducted during the first circuit breaker's experiments. The remaining electrical life of the second circuit breaker is assessed based on the amount of charge passing through the arc-breaking and pre-breakdown arc-breaking periods during the number of opening and closing operations of the first circuit breaker, and the amount of charge passing through the first circuit breaker before its first breaking failure. The amount of charge passing through the first circuit breaker before its first breaking failure provides a practical basis for the overall assessment method, and by combining the amount of charge passing through the arc-breaking and pre-breakdown arc-breaking periods during the number of opening and closing operations of the first circuit breaker, the assessment of the remaining electrical life of the circuit breaker is achieved, greatly improving the reliability of the assessment.

[0108] This application can accurately assess the remaining electrical life of circuit breakers, facilitating proactive maintenance or replacement of circuit breakers based on their remaining electrical life, reducing the impact of temporary power outages, improving the availability of DC energy in converter stations, and enhancing the stability of DC transmission systems. Attached Figure Description

[0109] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0110] Figure 1 This is a schematic flowchart of a method for assessing the remaining electrical life of a circuit breaker in an embodiment of this application;

[0111] Figure 2 This is a schematic diagram of the probability distribution of arc charge during a single pre-breakdown of the first circuit breaker in this embodiment of the application.

[0112] Figure 3 This is a schematic diagram of the current division interval of the first circuit breaker in the embodiments of this application;

[0113] Figure 4 This is a schematic structural diagram of a circuit breaker residual electrical life assessment device in an embodiment of this application. Detailed Implementation

[0114] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0115] The terms "first," "second," etc., used in the specification, embodiments, claims, and drawings of this application are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, such as including a series of steps or units. A method, system, product, or apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses.

[0116] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0117] Example 1:

[0118] This application provides a method for assessing the remaining electrical life of a circuit breaker based on charge quantity, such as... Figure 1 As shown. Evaluation method 100 includes the following steps:

[0119] Step S1: Determine the amount of charge passing through the arc interruption period and the pre-breakdown arc period in the number of opening and closing cycles consumed by the first circuit breaker in operation.

[0120] Step S2: Calculate the amount of charge that passed before the first circuit breaker failed to open, based on the number of opening attempts consumed in the first circuit breaker experiment.

[0121] Step S3: Evaluate the remaining electrical life of the second circuit breaker based on the amount of charge passed during the interruption of arcing and the pre-breakdown arcing in the number of opening and closing cycles consumed by the first circuit breaker and the amount of charge passed before the first circuit breaker failed to interrupt for the first time.

[0122] In some embodiments, determining the amount of charge passing through the interruption of the arc and the pre-breakdown arc during the number of opening and closing operations consumed by the first circuit breaker in operation, based on the number of opening and closing operations consumed by the first circuit breaker in operation, includes:

[0123] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is determined based on the current passing through the first circuit breaker in its operating state or based on the number of closing operations consumed by the first circuit breaker.

[0124] The amount of charge passing through the first circuit breaker during the arc breaking process is calculated based on the number of times the first circuit breaker has been interrupted while in operation.

[0125] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is added together with the amount of charge passing through the first circuit breaker during the arc breaking period while it is in operation to obtain the amount of charge passing through the arc breaking period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker.

[0126] Furthermore, the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while in operation can be determined based on either the current passing through the first circuit breaker in its operating state or the number of closing operations consumed by the first circuit breaker, using any of the following methods:

[0127] Method 1: The discrete data integration method is used to integrate the current passing through the first circuit breaker during the pre-breakdown arcing period in the operating state, so as to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state.

[0128] Method 2: According to, for example Figure 2 The probability distribution diagram of the charge passing through the first circuit breaker during a single pre-breakdown arcing event is shown. The average charge passing through the first circuit breaker during a single pre-breakdown arcing event with a 90% probability is determined. Based on the number of closing events consumed by the first circuit breaker and the average charge passing through the first circuit breaker during a single pre-breakdown arcing event with a 90% probability, the charge passing through the first circuit breaker during the pre-breakdown arcing event in the operating state is determined.

[0129] Figure 2 In the diagram, the horizontal axis represents the amount of arc charge during a single pre-breakdown of the first circuit breaker, and the vertical axis represents the cumulative probability of arc energy during pre-breakdown of the first circuit breaker. Solid dots represent the amount of arc charge during a single pre-breakdown of the first circuit breaker, the solid line represents the fitted range of the probability distribution of the arc charge during a single pre-breakdown of the first circuit breaker, and the dashed line represents the fitted line of the probability distribution of the arc charge during a single pre-breakdown of the first circuit breaker. The value on the horizontal axis corresponding to the fitted line of this distribution, when the vertical axis is 90%, is the amount of charge passing through the first circuit breaker during the pre-breakdown arc period in its operating state.

[0130] Optionally, the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state satisfies:

[0131] Q hc1 =Q 1* ×N hc1

[0132] Among them, Q hc1 In this embodiment, Q represents the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation. hc1 It can be 83.436C. Q 1* This represents the average charge passing through the first circuit breaker during a single pre-breakdown arcing event. In the embodiments of this application, the average charge passing through the first circuit breaker during a single pre-breakdown arcing event with a 90% probability can be 0.2C.hc1 This indicates the number of times the first circuit breaker has been closed.

[0133] For example, calculating the amount of charge passing through the first circuit breaker during arc interruption in its operating state based on the number of interruptions consumed by the first circuit breaker in its operating state includes:

[0134] The amount of charge passing through the first circuit breaker during arc breaking is calculated based on the number of interruptions consumed by the first circuit breaker in operation and the average value of the AC component amplitude of the current during all arc breaking periods in the first circuit breaker in operation.

[0135] In one example, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through the first circuit breaker during the interruption of arcing in the operating state satisfies:

[0136] Q ho1 =N ho1 ×Q o1

[0137] Among them, Q ho1 This represents the amount of charge that passed through the first circuit breaker during the interruption of arcing while it was in operation. In the embodiments of this application, Q... ho1 It can be 259.81°C. N ho1 This indicates the number of interruptions that the first circuit breaker has performed while in operation; it can be 421. o1 This indicates the amount of charge passing through the first circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h1 I represents the arc-breaking time of the first circuit breaker. cm1 ΔI1 represents the average amplitude of the AC component of the current during all arc-breaking periods when the first circuit breaker is in operation, and can be 207A. ω represents the average amplitude of the DC component of the current during all arc-breaking periods when the first circuit breaker is in operation, and ω represents the system frequency.

[0138] In another example, if the first circuit breaker is one that does not perform phase-selective interruption, the amount of charge passing through the first circuit breaker during the interruption of arcing in the operating state satisfies:

[0139]

[0140] Where M1 represents the number of current zones of the first circuit breaker, which can be 10. Q oi1 This indicates that the first circuit breaker is in operation state t. hi1 The corresponding charge amount passing through during a single arc interruption, t hi1 Q represents the arc-breaking time of the first circuit breaker in the i-th interval under operating conditions; oi1 satisfy

[0141] The current of the first circuit breaker can be calculated according to... Figure 3 Divide the interval. Figure 3 In the diagram, the horizontal axis represents the duration of the first circuit breaker current, and the vertical axis represents the instantaneous value of the first circuit breaker current. The area between the two solid lines represents all possible instantaneous values ​​of the first circuit breaker current, and the dashed line represents the average value of the instantaneous values ​​of the first circuit breaker current.

[0142] In some other possible implementations, step S2 calculates the amount of charge that passed before the first circuit breaker's initial failure to break, based on the number of breaks already consumed in the first circuit breaker experiment, including:

[0143] The discrete data integration method was used to integrate the current passing through the first circuit breaker during the pre-breakdown arcing period to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period.

[0144] Calculate the amount of charge that passed during the arc breaking period in the first circuit breaker experiment based on the number of breaking cycles consumed in the first circuit breaker experiment.

[0145] The amount of charge passing during the pre-breakdown arcing period in the first circuit breaker experiment is added together with the amount of charge passing during the arcing interruption period in the first circuit breaker experiment to obtain the amount of charge passing before the first interruption failure of the first circuit breaker.

[0146] Optionally, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through during the arc interruption period in the first circuit breaker test satisfies:

[0147] Q eo =N eo ×Q o1

[0148] Among them, Q eo N represents the amount of charge that passed during the arc interruption in the first circuit breaker experiment; eo This indicates the number of times the circuit breaker has been switched during the first circuit breaker test.

[0149] If the first circuit breaker is a circuit breaker that performs phase-selective interruption, the amount of charge passing through during the arc interruption period of the first circuit breaker test satisfies:

[0150]

[0151] For example, the remaining electrical life of the second circuit breaker in step 3 satisfies:

[0152]

[0153] Where, N s2 This indicates the remaining electrical life of the second circuit breaker. Q h1This represents the amount of charge passed during the interruption of the arcing period and the pre-breakdown arcing period in the number of opening and closing operations consumed by the first circuit breaker. In the embodiments of this application, Q h1 It can be 343.246C. Q e This represents the amount of charge that passed before the first circuit breaker failed to interrupt its initial operation. In this embodiment, Q... e It can be 848.4922C.

[0154] Q h2 This represents the amount of charge passed during the interruption of the arcing period and the pre-breakdown arcing period in the number of opening and closing operations consumed by the second circuit breaker, satisfying Q. h2 =Q ho2 +Q hc2 Q ho2 Q represents the amount of charge passing through the second circuit breaker during the interruption of arcing while it is in operation. hc2 This indicates the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation; N h2 This indicates the number of times the second circuit breaker has been switched on and off while in operation.

[0155] The amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation is determined in the following way:

[0156] Method 1: The current passing through the second circuit breaker during the pre-breakdown arcing period is obtained by integrating the discrete data integration method.

[0157] Method 2: Determine the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the probability distribution diagram of the charge passing through the second circuit breaker during a single pre-breakdown arcing period; and obtain the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the number of closing cycles consumed by the second circuit breaker.

[0158] Furthermore, if the second circuit breaker is a phase-selective interrupter, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0159] Q ho2 =N ho2 ×Q o2

[0160] Where, N ho2 This indicates the number of interruptions that the second circuit breaker has performed while in operation; Q o2 This indicates the amount of charge passing through the second circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h2 Indicates the arc-breaking time of the second circuit breaker, I cm2ΔI2 represents the average value of the AC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, ΔI2 represents the average value of the DC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, and ω represents the system frequency.

[0161] If the second circuit breaker is a circuit breaker without phase-selective interruption, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0162]

[0163] Where M2 represents the number of current zones of the second circuit breaker, Q oi2 This indicates that the second circuit breaker is in operation. hi2 The corresponding charge amount passing through during a single arc interruption, t hi2 Q represents the arc-breaking time of the second circuit breaker in the i-th interval under operating conditions; oi2 satisfy

[0164] For example, the amount of charge passing through the second circuit breaker during pre-breakdown arcing in the operating state satisfies:

[0165] Q hc2 =Q 2* ×N hc2

[0166] Among them, Q hc2 Q represents the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation. 2* N represents the average charge passing through the second circuit breaker during a single pre-breakdown arcing event. hc2 This indicates the number of times the second circuit breaker has been closed.

[0167] Optionally, the evaluation method provided in this application embodiment further includes: evaluating the remaining electrical life of the first circuit breaker based on the amount of charge passed during the arc interruption period and the pre-breakdown arc interruption period in the number of opening and closing cycles consumed by the first circuit breaker, the amount of charge passed before the first circuit breaker failed to interrupt for the first time, and the number of opening and closing cycles consumed by the first circuit breaker in operation.

[0168] Optionally, the remaining electrical life of the first circuit breaker satisfies:

[0169]

[0170] Where, N s1 Q represents the remaining electrical life of the first circuit breaker; h1 This represents the amount of charge that passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; Q e N represents the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; h1This indicates the number of times the first circuit breaker has been switched on and off while it is in operation.

[0171] Example 2:

[0172] Based on the same inventive concept, embodiments of this application also provide a circuit breaker residual life assessment device based on charge quantity, such as... Figure 4 As shown, the evaluation device 200 includes:

[0173] Module 1 is used to determine the amount of charge passing through the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker in operation.

[0174] Calculation module 2 is used to calculate the amount of charge that passed before the first circuit breaker failed to open, based on the number of opening attempts consumed in the first circuit breaker experiment.

[0175] The first evaluation module 3 is used to evaluate the remaining electrical life of the second circuit breaker based on the amount of charge passed during the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker and the amount of charge passed before the first circuit breaker failed to interrupt for the first time.

[0176] In some possible implementations, module 1 is used for:

[0177] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is determined based on the current passing through the first circuit breaker in the operating state or based on the number of closing operations consumed by the first circuit breaker.

[0178] The amount of charge passing through the first circuit breaker during the arc breaking process is calculated based on the number of breaking operations consumed by the first circuit breaker in operation.

[0179] The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is added together with the amount of charge passing through the first circuit breaker during the arc breaking period while it is in operation to obtain the amount of charge passing through the arc breaking period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker.

[0180] Furthermore, module 1 is used to:

[0181] The current passing through the first circuit breaker during the pre-breakdown arcing period in the operating state is integrated using the discrete data integration method to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state; or,

[0182] Based on the probability distribution diagram of the charge passing through the first circuit breaker during a single pre-breakdown arcing, the average charge passing through the first circuit breaker during a single pre-breakdown arcing is determined; and based on the number of closing operations consumed by the first circuit breaker and the average charge passing through the first circuit breaker during a single pre-breakdown arcing, the charge passing through the first circuit breaker during the pre-breakdown arcing in its operating state is determined.

[0183] Among them, the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state satisfies:

[0184] Q hc1 =Q 1* ×N hc1

[0185] Among them, Q hc1 Q represents the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation. 1* N represents the average charge passing through the first circuit breaker during a single pre-breakdown arcing event. hc1 This indicates the number of times the first circuit breaker has been closed.

[0186] Optionally, module 1 is used to:

[0187] The amount of charge passing through the first circuit breaker during arc breaking is calculated based on the number of interruptions consumed by the first circuit breaker in operation and the average value of the AC component amplitude of the current during all arc breaking periods in the first circuit breaker in operation.

[0188] On the one hand, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through the first circuit breaker during the interruption of arcing in operation satisfies the following:

[0189] Q ho1 =N ho1 ×Q o1

[0190] Among them, Q ho1 N represents the amount of charge passing through the first circuit breaker during the interruption of arcing while it is in operation. ho1 Q represents the number of interruptions that the first circuit breaker has performed while in operation; o1 This indicates the amount of charge passing through the first circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h1 I represents the arc-breaking time of the first circuit breaker. cm1 ΔI1 represents the average value of the AC component amplitude of the current during all arc breaking periods when the first circuit breaker is in operation, ω represents the average value of the DC component amplitude of the current during all arc breaking periods when the first circuit breaker is in operation, and ω represents the system frequency.

[0191] On the other hand, if the first circuit breaker is a circuit breaker that does not employ phase-selective interruption, the amount of charge passing through the first circuit breaker during the arc interruption in operation satisfies the following:

[0192]

[0193] Where M1 represents the number of current ranges of the first circuit breaker, Q oi1 This indicates that the first circuit breaker is in operation state t. hi1 The corresponding charge amount passing through during a single arc interruption, t hi1 Q represents the arc-breaking time of the first circuit breaker in the i-th interval under operating conditions; oi1 satisfy

[0194] In some other possible implementations, computation module 2 is used for:

[0195] The current passing through the first circuit breaker during the pre-breakdown arcing period is integrated using the discrete data integration method to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period.

[0196] Calculate the amount of charge that passed during the arc breaking period in the first circuit breaker test based on the number of breaks consumed in the first circuit breaker test;

[0197] The amount of charge passing during the pre-breakdown arcing period in the first circuit breaker experiment is added together with the amount of charge passing during the arcing interruption period in the first circuit breaker experiment to obtain the amount of charge passing before the first interruption failure of the first circuit breaker.

[0198] Optionally, if the first circuit breaker is a phase-selective interrupter, the amount of charge passing through during the arc interruption period in the first circuit breaker test satisfies:

[0199] Q eo =N eo ×Q o1

[0200] Among them, Q eo N represents the amount of charge that passed during the arc interruption in the first circuit breaker experiment; eo This indicates the number of interruptions that have been performed in the first circuit breaker test;

[0201] If the first circuit breaker is a circuit breaker that performs phase-selective interruption, the amount of charge passing through during the arc interruption period of the first circuit breaker test satisfies:

[0202]

[0203] The first evaluation module 3 evaluates the remaining electrical life of the second circuit breaker according to the following formula (that is, the remaining electrical life of the second circuit breaker satisfies the following formula):

[0204]

[0205] Where, N s2 Indicates the remaining electrical life of the second circuit breaker; Q h1 This represents the amount of charge that passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; Q e Q represents the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; h2 This represents the amount of charge passed during the interruption of the arcing period and the pre-breakdown arcing period in the number of opening and closing operations consumed by the second circuit breaker, satisfying Q. h2 =Q ho2 +Q hc2 Q ho2 Q represents the amount of charge passing through the second circuit breaker during the interruption of arcing while it is in operation. hc2 This indicates the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation; N h2 This indicates the number of times the second circuit breaker has been switched on and off while in operation.

[0206] The first evaluation module 3 determines the amount of charge passing through the second circuit breaker during pre-breakdown arcing in the operating state using the following method:

[0207] Method 1: The current passing through the second circuit breaker during the pre-breakdown arcing period is obtained by integrating the discrete data integration method.

[0208] Method 2: Determine the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the probability distribution diagram of the charge passing through the second circuit breaker during a single pre-breakdown arcing period; and obtain the average charge passing through the second circuit breaker during a single pre-breakdown arcing period based on the number of closing cycles consumed by the second circuit breaker.

[0209] Optionally, the first evaluation module 3 determines the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period in the operating state using the following formula (i.e., the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period in the operating state satisfies the following formula):

[0210] Q hc2 =Q 2* ×N hc2

[0211] Among them, Q hc2 Q represents the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation. 2* N represents the average charge passing through the second circuit breaker during a single pre-breakdown arcing event. hc2 This indicates the number of times the second circuit breaker has been closed.

[0212] If the second circuit breaker is a phase-selective interrupter, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0213] Q ho2 =N ho2 ×Q o2

[0214] Where, N ho2 This indicates the number of interruptions that the second circuit breaker has performed while in operation; Q o2 This indicates the amount of charge passing through the second circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: t h2 Indicates the arc-breaking time of the second circuit breaker, I cm2 ΔI2 represents the average value of the AC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, ΔI2 represents the average value of the DC component amplitude of the current during all arc breaking periods when the second circuit breaker is in operation, and ω represents the system frequency.

[0215] If the second circuit breaker is a circuit breaker without phase-selective interruption, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following:

[0216]

[0217] Where M2 represents the number of current zones of the second circuit breaker, Q oi2 This indicates that the second circuit breaker is in operation. hi2 The corresponding charge amount passing through during a single arc interruption, t hi2 Q represents the arc-breaking time of the second circuit breaker in the i-th interval under operating conditions; oi2 satisfy

[0218] Optionally, the evaluation device may also include:

[0219] The second evaluation module is used to evaluate the remaining electrical life of the first circuit breaker based on the amount of charge passed during the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker, the amount of charge passed before the first interruption failure of the first circuit breaker, and the number of opening and closing cycles consumed by the first circuit breaker in operation.

[0220] Specifically, the second evaluation module evaluates the remaining electrical life of the first circuit breaker using the following formula (i.e., the remaining electrical life of the first circuit breaker satisfies the following formula):

[0221]

[0222] Where, N s1 Q represents the remaining electrical life of the first circuit breaker; h1This represents the amount of charge that passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; Q e N represents the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; h1 This indicates the number of times the first circuit breaker has been switched on and off while it is in operation.

[0223] Example 3:

[0224] Based on the same inventive concept, this application also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the evaluation method provided in the above embodiments.

[0225] Example 4:

[0226] Based on the same inventive concept, this application also provides a storage medium, specifically a computer-readable storage medium (Memory). A computer-readable storage medium is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the evaluation method provided in the above embodiments.

[0227] Those skilled in the art will understand that the embodiments of the application can be provided as a method, system, or computer program product. Therefore, the application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0228] The application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0229] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0230] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0231] The above are merely examples of the application and are not intended to limit the application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application shall be included within the scope of the claims of the pending application.

Claims

1. A method for assessing the remaining electrical life of a circuit breaker based on charge quantity, characterized in that, include: The amount of charge passing through the interruption of the arc and the pre-breakdown arc during the number of opening and closing cycles consumed by the first circuit breaker in operation is determined based on the number of opening and closing cycles consumed by the first circuit breaker in operation. Calculate the amount of charge that passed before the first circuit breaker failed to open during the first circuit breaker test based on the number of opening attempts already completed. The remaining electrical life of the second circuit breaker is assessed based on the amount of charge passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker and the amount of charge passed before the first circuit breaker failed to interrupt for the first time. The remaining electrical life of the second circuit breaker satisfies: in, Indicates the remaining electrical life of the second circuit breaker; This indicates the amount of charge that has passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; This indicates the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; This indicates the amount of charge passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the second circuit breaker, satisfying the following conditions: , This indicates the amount of charge that passed through the second circuit breaker during the arc interruption process while it was in operation. This indicates the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation; This indicates the number of times the second circuit breaker has been switched on and off while in operation.

2. The method for assessing the remaining electrical life of a circuit breaker according to claim 1, characterized in that, The determination of the amount of charge passing through the interruption of arcing and the pre-breakdown arcing during the number of opening and closing cycles consumed by the first circuit breaker in operation includes: The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in the operating state is determined based on the current passing through the first circuit breaker in the operating state or based on the number of closing operations consumed by the first circuit breaker. The amount of charge passing through the first circuit breaker during the arc breaking process is calculated based on the number of breaking operations consumed by the first circuit breaker in operation. The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period while it is in operation is added together with the amount of charge passing through the first circuit breaker during the arcing interruption period while it is in operation to obtain the amount of charge passing through the arcing interruption period and the pre-breakdown arcing period in the number of opening and closing operations consumed by the first circuit breaker.

3. The method for assessing the remaining electrical life of a circuit breaker according to claim 2, characterized in that, Determining the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in its operating state based on the current passing through the first circuit breaker in its operating state or based on the number of closing operations consumed by the first circuit breaker includes: The current passing through the first circuit breaker during the pre-breakdown arcing period in its operating state is integrated using the discrete data integration method to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in its operating state; or, Based on the probability distribution diagram of the charge amount passing through the first circuit breaker during a single pre-breakdown arcing, the average charge amount passing through the first circuit breaker during a single pre-breakdown arcing is determined; and based on the number of closing operations consumed by the first circuit breaker and the average charge amount passing through the first circuit breaker during a single pre-breakdown arcing, the charge amount passing through the first circuit breaker during the pre-breakdown arcing in its operating state is determined.

4. The method for assessing the remaining electrical life of a circuit breaker according to claim 3, characterized in that, The amount of charge passing through the first circuit breaker during the pre-breakdown arcing period in its operating state satisfies the following: in, This indicates the amount of charge that passes through the first circuit breaker during the pre-breakdown arcing period while it is in operation. This represents the average charge passing through the first circuit breaker during a single pre-breakdown arcing period. This indicates the number of times the first circuit breaker has been closed.

5. The method for assessing the remaining electrical life of a circuit breaker according to claim 2, characterized in that, The calculation of the amount of charge passing through the first circuit breaker during arc breaking in operation, based on the number of breaking operations consumed by the first circuit breaker in operation, includes: The amount of charge passing through the first circuit breaker during arc breaking is calculated based on the number of interruptions consumed by the first circuit breaker in operation and the average value of the AC component amplitude of the current during all arc breaking periods of the first circuit breaker in operation.

6. The method for assessing the remaining electrical life of a circuit breaker according to claim 5, characterized in that, If the first circuit breaker is a phase-selective interrupter, the amount of charge passing through the first circuit breaker during the interruption of arcing in operation satisfies the following: in, This indicates the amount of charge that passed through the first circuit breaker during the interruption of the arc while it was in operation; This indicates the number of interruptions that the first circuit breaker has consumed while in operation; This indicates the amount of charge passing through the first circuit breaker during a single interruption of arcing while it is in operation, satisfying the following conditions: , This indicates the arc-breaking time of the first circuit breaker. This represents the average amplitude of the AC component of the current during all interruption and arcing periods when the first circuit breaker is in operation. This represents the average value of the DC component of the current during all interruption and arcing periods when the first circuit breaker is in operation. Indicates the system frequency; If the first circuit breaker is a circuit breaker that does not employ phase-selective interruption, the amount of charge passing through the first circuit breaker during the arc interruption in its operating state satisfies the following: in, M 1 indicates the number of current ranges of the first circuit breaker. This indicates that the first circuit breaker is in operation. t hi1 The corresponding amount of charge passing through during a single arc interruption. t hi1 This indicates that the first circuit breaker is in operation during the [number]th [period]. i The arc-breaking time of each interval; satisfy .

7. The method for assessing the remaining electrical life of a circuit breaker according to claim 6, characterized in that, The calculation of the charge passing through the first circuit breaker before its first failed interruption, based on the number of interruptions consumed in the first circuit breaker experiment, includes: The current passing through the first circuit breaker during the pre-breakdown arcing period is integrated using the discrete data integration method to obtain the amount of charge passing through the first circuit breaker during the pre-breakdown arcing period. Calculate the amount of charge that passed during the arc breaking period in the first circuit breaker experiment based on the number of breaking cycles consumed in the first circuit breaker experiment; The amount of charge passing through during the pre-breakdown arcing period in the first circuit breaker experiment is added together with the amount of charge passing through during the arcing interruption period in the first circuit breaker experiment to obtain the amount of charge passing through the first circuit breaker before its first interruption failure.

8. The method for assessing the remaining electrical life of a circuit breaker according to claim 7, characterized in that, If the first circuit breaker is a phase-selective interrupter, the amount of charge passing through during the arc interruption period of the first circuit breaker test satisfies: in, This represents the amount of charge that passed through during the arc interruption process in the first circuit breaker experiment; This indicates the number of times the circuit breaker has been switched during the experiment. If the first circuit breaker is a circuit breaker that performs phase-selective interruption, the amount of charge passing through during the arc interruption period of the first circuit breaker test satisfies: 。 9. The method for assessing the remaining electrical life of a circuit breaker according to claim 1, characterized in that, The amount of charge passing through the second circuit breaker during pre-breakdown arcing while it is in operation is determined by the following method: The current passing through the second circuit breaker during the pre-breakdown arcing period in its operating state is obtained by integrating the discrete data integration method; or, Based on the probability distribution diagram of the charge passing through the second circuit breaker during a single pre-breakdown arcing period, the average charge passing through the second circuit breaker during a single pre-breakdown arcing period is determined; and based on the number of closing operations consumed by the second circuit breaker and the average charge passing through the second circuit breaker during a single pre-breakdown arcing period, it is obtained.

10. The method for assessing the remaining electrical life of a circuit breaker according to claim 9, characterized in that, The amount of charge passing through the second circuit breaker during the pre-breakdown arcing period in the operating state satisfies: in, This indicates the amount of charge that passes through the second circuit breaker during the pre-breakdown arcing period while it is in operation. This indicates the average charge passing through the second circuit breaker during a single pre-breakdown arcing period. This indicates the number of times the second circuit breaker has been closed.

11. The method for assessing the remaining electrical life of a circuit breaker according to claim 1, characterized in that, If the second circuit breaker is a phase-selective interrupter, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following: in, This indicates the number of interruptions that the second circuit breaker has consumed while in operation; This indicates the amount of charge passing through the second circuit breaker during a single interruption of the arc while it is in operation, satisfying the following conditions: , This indicates the arc-breaking time of the second circuit breaker. This represents the average amplitude of the AC component of the current during all interruption and arcing periods when the second circuit breaker is in operation. This represents the average value of the DC component of the current during all interruption and arcing periods when the second circuit breaker is in operation. Indicates the system frequency; If the second circuit breaker is a circuit breaker that does not employ phase-selective interruption, the amount of charge passing through the second circuit breaker during the arc interruption in operation satisfies the following: in, M 2 indicates the number of current ranges of the second circuit breaker. This indicates that the second circuit breaker is in operation. t hi2 The corresponding amount of charge passing through during a single arc interruption. t hi2 This indicates that the second circuit breaker is in operation during the [number]th [period]. i The arc-breaking time of each interval; satisfy .

12. The method for assessing the remaining electrical life of a circuit breaker according to claim 1, characterized in that, The evaluation method also includes: The remaining electrical life of the first circuit breaker is assessed based on the amount of charge passed during the interruption of arcing and the pre-breakdown arcing in the number of opening and closing cycles consumed by the first circuit breaker, the amount of charge passed before the first circuit breaker failed to interrupt, and the number of opening and closing cycles consumed by the first circuit breaker in operation.

13. The method for assessing the remaining electrical life of a circuit breaker according to claim 12, characterized in that, The remaining electrical life of the first circuit breaker satisfies: in, This indicates the remaining electrical life of the first circuit breaker; This indicates the amount of charge that has passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; This indicates the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; This indicates the number of times the first circuit breaker has been switched on and off while in operation.

14. A circuit breaker residual electrical life assessment device based on charge quantity, characterized in that, include: The determination module is used to determine the amount of charge passing through the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker in operation. The calculation module is used to calculate the amount of charge that passed through the first circuit breaker before its first failure to open, based on the number of openings consumed in the first circuit breaker experiment. The first evaluation module is used to evaluate the remaining electrical life of the second circuit breaker based on the amount of charge passed during the interruption arcing period and the pre-breakdown arcing period in the number of opening and closing cycles consumed by the first circuit breaker and the amount of charge passed before the first circuit breaker failed to interrupt for the first time. The remaining electrical life of the second circuit breaker satisfies: in, Indicates the remaining electrical life of the second circuit breaker; This indicates the amount of charge that has passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the first circuit breaker; This indicates the amount of charge that passed before the first circuit breaker failed to interrupt the circuit for the first time; This indicates the amount of charge passed during the interruption of the arc and the pre-breakdown arc in the number of opening and closing cycles consumed by the second circuit breaker, satisfying the following conditions: , This indicates the amount of charge that passed through the second circuit breaker during the arc interruption process while it was in operation. This indicates the amount of charge passing through the second circuit breaker during the pre-breakdown arcing period while it is in operation; This indicates the number of times the second circuit breaker has been switched on and off while in operation.

15. A computer device, characterized in that, include: One or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, the evaluation method as described in any one of claims 1 to 13 is implemented.

16. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements the evaluation method as described in any one of claims 1 to 13.

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