Method and device for adjusting threshold value of circuit breaker, circuit breaker and storage medium

Abstract

The invention provides a circuit breaker threshold value adjusting method and device, a circuit breaker and a storage medium. The method comprises the steps that the terminal temperature, the environment temperature and the temperature difference limit value of the circuit breaker and the circuit breaker threshold value at the last moment are acquired; under the condition that the difference value between the terminal temperature of the circuit breaker and the environment temperature is smaller than a first preset value, a temperature difference result is calculated; the temperature difference result is obtained based on the difference value between the terminal temperature of the circuit breaker and the predicted temperature; the predicted temperature is calculated according to the environment temperature; and according to the temperature difference result and the temperature difference limit value, adjusting the circuit breaker threshold at the previous moment to obtain the circuit breaker threshold at the current moment. Based on the technical scheme, the influence of the terminal heating characteristic and the time characteristic of the circuit breaker on the threshold value of the circuit breaker is considered at the same time, the threshold value of the circuit breaker is adjusted in a self-adaptive mode, the calculation precision of the threshold value of the circuit breaker is improved, and therefore misoperation of the circuit breaker is avoided, the misoperation rate of the circuit breaker is reduced, and the service life of the circuit breaker is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage power distribution protection, and particularly relates to a circuit breaker threshold value adjustment method and device, a circuit breaker, and a storage medium. BACKGROUND

[0002] A circuit breaker mainly consists of a contact system, an arc extinguishing system, an operating system, and a detection system. When the circuit is working normally, the contacts in the contact system are in a closed state, and the current can pass through. Once an abnormal situation such as a short circuit occurs in the circuit, the detection device (such as an overcurrent release) in the circuit breaker can sense the change in the abnormal current. For example, when the current exceeds the threshold value, the armature of the electromagnetic release is attracted by the electromagnetic force and drives the operating mechanism to act, causing the contacts to break rapidly and cut off the circuit. At the same time, the arc extinguishing system can quickly extinguish the arc at the moment of contact breaking to avoid damage to the equipment caused by the continuous combustion of the arc.

[0003] In related technologies, a fixed threshold value is usually used, which has poor applicability and cannot adaptively adjust the threshold value according to the use of the circuit breaker, so the misoperation rate of the circuit breaker is high. SUMMARY

[0004] The present application provides a circuit breaker threshold value adjustment method and device, a circuit breaker, and a storage medium to solve the technical problem that the threshold value cannot be adaptively adjusted according to the use of the circuit breaker.

[0005] To achieve the above-mentioned purpose, according to a first aspect of the present application, a circuit breaker threshold value adjustment method is provided, comprising:

[0006] obtaining a terminal temperature of the circuit breaker, an ambient temperature, a temperature difference limit value, and a circuit breaker threshold value at a previous moment;

[0007] calculating a temperature difference result in a case where a difference between the terminal temperature of the circuit breaker and the ambient temperature is less than a first preset value; the temperature difference result is obtained based on a difference between the terminal temperature of the circuit breaker and a predicted temperature; the predicted temperature is calculated according to the ambient temperature;

[0008] adjusting the circuit breaker threshold value at the previous moment according to the temperature difference result and the temperature difference limit value to obtain a circuit breaker threshold value at a current moment.

[0009] In some embodiments, adjusting the circuit breaker threshold value at the previous moment according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value at the current moment comprises:

[0010] comparing the terminal temperature of the circuit breaker with the predicted temperature;

[0011] In a case where the terminal temperature of the circuit breaker is less than the predicted temperature, the circuit breaker threshold value of the previous time is amplified according to the temperature difference result and the temperature difference limit value, to obtain the circuit breaker threshold value of the current time.

[0012] In some embodiments, after comparing the terminal temperature of the circuit breaker and the predicted temperature, the method further comprises:

[0013] In a case where the terminal temperature of the circuit breaker is equal to the predicted temperature, it is determined that the circuit breaker threshold value of the current time is equal to the circuit breaker threshold value of the previous time.

[0014] In some embodiments, after comparing the terminal temperature of the circuit breaker and the predicted temperature, the method further comprises:

[0015] In a case where the terminal temperature of the circuit breaker is greater than the predicted temperature, the circuit breaker threshold value of the previous time is reduced according to the temperature difference result and the temperature difference limit value, to obtain the circuit breaker threshold value of the current time.

[0016] In some embodiments, after obtaining the terminal temperature of the circuit breaker, the ambient temperature, the temperature difference limit value and the circuit breaker threshold value of the previous time, the method further comprises:

[0017] In a case where the difference between the terminal temperature of the circuit breaker and the ambient temperature is greater than or equal to a first preset value, a multiplication result of the circuit breaker threshold value of the previous time and a reduction coefficient is calculated, to obtain the circuit breaker threshold value of the current time.

[0018] In some embodiments, the reduction coefficient is equal to 0.8.

[0019] In some embodiments, the first preset value is equal to 15℃.

[0020] In some embodiments, the temperature difference limit value is equal to 10℃.

[0021] According to a second aspect of the present application, an adjusting device for a circuit breaker threshold value is provided, comprising:

[0022] An obtaining module is configured to obtain the terminal temperature of the circuit breaker, the ambient temperature, the temperature difference limit value and the circuit breaker threshold value of the previous time;

[0023] A calculating module is configured to, in a case where the difference between the terminal temperature of the circuit breaker and the ambient temperature is less than a first preset value, calculate a temperature difference result; the temperature difference result is obtained based on the difference between the terminal temperature of the circuit breaker and a predicted temperature; the predicted temperature is calculated according to the ambient temperature.

[0024] an adjusting module configured to adjust the circuit breaker threshold value at the previous time according to the temperature difference result and the temperature difference limit value, to obtain a circuit breaker threshold value at the current time.

[0025] The apparatus of the present application can also be divided into more or fewer modules, or other module arrangements, without limitation. For example, the obtaining module, the calculating module, and the adjusting module can be integrated into a processing module (or processing unit).

[0026] According to a third aspect of the present application, a circuit breaker is provided, the circuit breaker being equipped with an electronic device, the electronic device comprising a processor and a memory for storing processor-executable instructions, the processor implementing the steps of the adjusting method of the circuit breaker threshold value according to any one of the above embodiments when executing the instructions.

[0027] According to a fourth aspect of the present application, a storage medium is provided, the storage medium storing computer instructions, the instructions implementing the steps of the adjusting method of the circuit breaker threshold value according to any one of the above embodiments when executed by a processor.

[0028] The technical solution of the present application can achieve the following beneficial effects: the present application provides an adjusting method of a circuit breaker threshold value, which takes into account the influence of the terminal heating characteristics and the time characteristics of the circuit breaker on the circuit breaker threshold value, and adaptively adjusts the circuit breaker threshold value, thereby improving the calculation accuracy of the circuit breaker threshold value, and avoiding the misoperation of the circuit breaker, and reducing the misoperation rate of the circuit breaker. Since the misoperation rate of the circuit breaker is reduced, the number of unnecessary opening and closing of the circuit breaker is reduced, and the service life of the circuit breaker can be prolonged. The reduction of the misoperation rate also means that the number of unnecessary power outages caused by the misoperation of the circuit breaker is reduced, and the continuity and stability of power supply are enhanced, thereby improving the reliability of the power supply system.

[0029] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0031] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.

[0032] Figure 1 A flowchart of an adjusting method of a circuit breaker threshold value according to an embodiment of the present application is shown in FIG. 1.

[0033] Figure 2 A structural schematic diagram of a circuit breaker provided for an embodiment of the present application is provided.

[0034] Figure 3 A flowchart of a circuit breaker threshold adjustment method provided for an embodiment of the present application is provided.

[0035] Figure 4 A structural schematic diagram of a circuit breaker threshold adjustment device provided for an embodiment of the present application is provided. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person skilled in the art without creative work fall within the scope of protection of the present application.

[0037] In the description of the present application, the terms "first", "second" are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] "A and / or B" includes the following three combinations: only A, only B, and the combination of A and B.

[0039] The use of "applicable to" or "configured to" in the present application means open and inclusive language, which does not exclude devices applicable to or configured to perform additional tasks or steps. In addition, the use of "based on" means open and inclusive, because the process, step, calculation or other action "based on" one or more described conditions or values can be based on additional conditions or beyond the described values in practice.

[0040] In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration." Any implementation described as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, for purposes of explanation, specific details are set forth to provide a thorough understanding of the present application. It will be apparent to one skilled in the art, however, that the present application can be practiced without using these specific details. In other instances, well-known structures and processes are not elaborated in order not to obscure the description of the present application with unnecessary details. Thus, the present application is not intended to be limited by the embodiments shown, but is to be accorded with the widest scope consistent with the principles and features disclosed herein.

[0041] In the related art, method one uses a fixed threshold, which relies on the principle of bimetallic strip thermal expansion and electromagnetic induction, cannot adjust the threshold according to the use of the circuit breaker, and the threshold is significantly affected by the environmental temperature (error ± 15%), and the misoperation rate of the harmonic scene is ≥ 30%. Method two is an electronic multi-gear protection, which needs to manually preset the threshold, cannot dynamically adapt to load fluctuations, and the aging of the circuit breaker will cause the threshold to drift (annual drift rate ≥ 3%). Method three is a history data driven self-learning, which relies on misoperation / refusal operation events to optimize parameters, and has defects such as data lag (lag time ≥ 24h), high misoperation rate of cold start (misoperation rate ≥ 15%), and missing detection of hidden faults.

[0042] In view of the technical problems of poor adaptability of the threshold and lagging behind of the threshold adjustment in the working condition, the application provides a circuit breaker threshold adjustment method, device, circuit breaker and storage medium to overcome the above problems.

[0043] In one aspect, the application embodiment provides a circuit breaker threshold adjustment method, which can be executed by a circuit breaker or related components (such as a chip). As shown in the figure, Figure 1 The circuit breaker threshold adjustment method includes the following steps:

[0044] S101: Obtain the terminal temperature, environmental temperature, temperature difference limit value and circuit breaker threshold of the last moment of the circuit breaker.

[0045] S102: In the case that the difference between the terminal temperature and the environmental temperature of the circuit breaker is less than the first preset value, calculate the temperature difference result; the temperature difference result is obtained based on the difference between the terminal temperature and the predicted temperature of the circuit breaker; the predicted temperature is calculated according to the environmental temperature.

[0046] S103: Adjust the circuit breaker threshold of the last moment according to the temperature difference result and the temperature difference limit value, to obtain the circuit breaker threshold of the current moment.

[0047] The following will describe in detail the circuit breaker threshold adjustment method provided by the application embodiment.

[0048] S101: Obtain the terminal temperature of the circuit breaker, the ambient temperature, the temperature difference limit value, and the circuit breaker threshold value of the previous moment.

[0049] In some embodiments, the terminal temperature of the circuit breaker is measured by a temperature sensor.

[0050] In some embodiments, the terminal temperature of the circuit breaker is represented as T terminal ; the ambient temperature refers to the ambient temperature near the circuit breaker, represented as T env ; the temperature difference limit value is represented as T lim ; and the circuit breaker threshold value of the previous moment is represented as I th0 .

[0051] In some embodiments, the temperature difference limit value is equal to 10℃.

[0052] S102: In the case where the difference between the terminal temperature of the circuit breaker and the ambient temperature is less than a first preset value, calculate a temperature difference result; the temperature difference result is based on the difference between the terminal temperature of the circuit breaker and a predicted temperature; the predicted temperature is calculated according to the ambient temperature.

[0053] In some embodiments, after obtaining the terminal temperature of the circuit breaker, the ambient temperature, the temperature difference limit value, and the circuit breaker threshold value of the previous moment, it is detected whether the difference between the terminal temperature of the circuit breaker and the ambient temperature is less than a first preset value. The first preset value is represented as T1.

[0054] In some embodiments, the first preset value is equal to 15℃.

[0055] In some embodiments, in the case where the difference between the terminal temperature of the circuit breaker and the ambient temperature is less than the first preset value (T terminal -T env <T1), a thermal-electric coupling model is constructed, the thermal-electric coupling model can calculate a predicted temperature based on the ambient temperature, the predicted temperature specifically refers to a predicted value of the ambient temperature, and the formula of the thermal-electric coupling model is as follows:

[0056]

[0057] R = R0 [1 + α (T env - 25)]

[0058] Wherein, T pred represents the predicted temperature; I eff represents the actual current with harmonics flowing in the circuit breaker; R represents the terminal resistance of the circuit breaker after thermal capacity adjustment; t represents the current flowing time; C represents the conductor thermal capacity; m represents the conductor mass; k represents the high-order harmonic current gain, which is usually 0.1; H h represents the harmonic current; and Ibase wherein I0 represents the fundamental current; R0 represents the terminal resistance of the circuit breaker; and a represents a temperature attenuation coefficient for fitting, which is set to 0.002 / °C.

[0059] The thermal-electric coupling model is a full-dimension protection model of "current-temperature-time", which considers the current-time variation trend and the temperature-time variation trend.

[0060] In some embodiments, the temperature difference result is calculated according to the following formula:

[0061] ΔT = T terminal -T pred

[0062] wherein ΔT represents the temperature difference result.

[0063] In some embodiments, the temperature difference result is obtained based on the difference between the terminal temperature and the predicted temperature of the circuit breaker, which can be implemented as follows: taking the difference between the terminal temperature and the predicted temperature of the circuit breaker as the temperature difference result.

[0064] Alternatively, the difference between the terminal temperature and the predicted temperature of the circuit breaker can be obtained first, and then the temperature difference result can be calculated based on the difference. For example, the difference is multiplied by a coefficient to obtain the temperature difference result. The specific calculation manner of the temperature difference result is not limited in the embodiments of the present application.

[0065] S103: adjusting the circuit breaker threshold value at the previous moment according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value at the current moment.

[0066] In some embodiments, the circuit breaker threshold value at the previous moment is adjusted according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value at the current moment, which specifically includes:

[0067] S1: comparing the terminal temperature and the predicted temperature of the circuit breaker;

[0068] S2: in the case that the terminal temperature of the circuit breaker is less than the predicted temperature, amplifying the circuit breaker threshold value at the previous moment according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value at the current moment.

[0069] In some embodiments, in the case that the terminal temperature of the circuit breaker is equal to the predicted temperature, it is determined that the circuit breaker threshold value at the current moment is equal to the circuit breaker threshold value at the previous moment.

[0070] In some embodiments, in the case that the terminal temperature of the circuit breaker is greater than the predicted temperature, the circuit breaker threshold value at the previous moment is reduced according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value at the current moment.

[0071] Specifically, the circuit breaker threshold value at the current moment can be obtained through the following threshold value adjustment formula:

[0072] I th =I th0 ×[1-γ×sign(ΔT)×min(|ΔT|,T lim )]

[0073] I th represents the breaker threshold value at the current moment; represents the adjustment coefficient, the value is 0.003, and the unit is one of centigrade degree; the sign() function is used to determine the sign of the input value, and when the input value AT is greater than 0, sign(ΔT) is equal to 1, when the input value AT is equal to 0, sign(ΔT) is equal to 0, and when the input value AT is less than 0, sign(ΔT) is equal to -1; min(|ΔT|,T lim ) represents returning the minimum value of |ΔT| and T lim , and T lim is equal to 10℃. Through min(|ΔT|,T lim ), T lim can be output when the absolute value of the temperature difference result is greater than T terminal , so as to avoid that the threshold adjustment formula deviates too much due to the temperature difference result being too large or too small.

[0074] Through the threshold adjustment formula, in the case that the terminal temperature of the breaker is less than the predicted temperature, the breaker threshold value at the previous moment can be amplified to obtain the breaker threshold value at the current moment; in the case that the terminal temperature of the breaker is equal to the predicted temperature, the breaker threshold value at the current moment is determined to be equal to the breaker threshold value at the previous moment; and in the case that the terminal temperature of the breaker is greater than the predicted temperature, the breaker threshold value at the previous moment can be reduced to obtain the breaker threshold value at the current moment.

[0075] In some embodiments, after obtaining the breaker threshold value at the current moment, the breaker threshold value at the current moment is sent to the tripping logic module of the breaker, so as to trigger the protection action. For example, in the case of time delay control protection, if the actual current passing through the breaker is greater than the breaker threshold value at the current moment, the breaker is disconnected after a preset time; in the case of overload protection, if the actual current passing through the breaker is greater than the breaker threshold value at the current moment, the time interval corresponding to the actual current passing through the breaker being greater than the breaker threshold value at the current moment is calculated, the heat accumulation corresponding to the time interval is calculated, and if the heat accumulation is too large, the breaker is disconnected.

[0076] In some embodiments, after obtaining the terminal temperature of the breaker, the ambient temperature, the temperature difference limit value and the breaker threshold value at the previous moment, the method further comprises: in the case that the difference between the terminal temperature and the ambient temperature of the breaker is greater than or equal to a first preset value, calculating the multiplication result of the breaker threshold value at the previous moment and the reduction coefficient to obtain the breaker threshold value at the current moment.

[0077] The above embodiment adopts cold start pre-calibration, dynamically adjusts the circuit breaker threshold according to the temperature difference result; through adjusting the circuit breaker threshold, implicit fault detection is realized, and in the case that the terminal temperature of the circuit breaker is greater than the predicted temperature, it indicates that the circuit breaker has an implicit fault of aging.

[0078] In some embodiments, the reduction coefficient is equal to 0.8.

[0079] In the case that the first preset value is equal to 15℃, if T terminal -T env ≥ 15℃, then I th = I th0 × K, K = 0.8, K represents the reduction coefficient. When the temperature difference between the terminal and the environment is too large, the threshold needs to be reduced to avoid the occurrence of inaction or late action.

[0080] In the actual application scenario of the circuit breaker, due to the diversity and difference of the load below the circuit breaker, the current passing through the circuit breaker will not be an ideal clean sinusoidal current, but a distorted current generated by harmonic action; at this time, through the traditional Fourier decomposition algorithm calculation, most of the harmonic current interference can be avoided, but the interference of high-order harmonics cannot be excluded, resulting in a difference between the calculated current amplitude and the actual current amplitude, leading to the occurrence of misoperation. Through the above embodiment, based on the thermal-electric closed-loop self-learning mechanism of the terminal temperature feedback, according to the characteristics of the current and the heating of the circuit breaker terminal, on the basis of the protection of only the current dimension, the calculation of the terminal temperature and the electric heat capacity (time) dimension is increased, the influence of the current actual current on the on-off of the circuit breaker is refined from two dimensions, and the threshold is dynamically adjusted to reduce the occurrence of misoperation, which is specifically embodied as: in the case that the terminal temperature of the circuit breaker is greater than the predicted temperature, it indicates that the circuit breaker is overheating or has an implicit fault of aging, so the circuit breaker threshold of the last moment is reduced to obtain the circuit breaker threshold of the current moment; on the contrary, in the case that the terminal temperature of the circuit breaker is less than the predicted temperature, it indicates that the current is small and the time is short, and the circuit breaker has no obvious heating, so the circuit breaker threshold of the last moment is amplified to obtain the circuit breaker threshold of the current moment, realizing real-time protection optimization of the circuit without manual intervention, and self-adaptively adjusting the circuit breaker threshold. The above embodiment directly measures the terminal temperature of the circuit breaker (±0.5℃ precision), replaces the indirect estimation model, and the terminal temperature precision is higher; the threshold is adjusted in real time based on the temperature difference result, without historical events; dynamically adjusting the threshold according to the heating condition also makes up for the protection parameter drift (annual error ≤0.5%) caused by aging.

[0081] Based on the above embodiments, the misoperation rate of the circuit breaker is reduced from ≥15% of the traditional scheme to ≤0.3%, solving the misoperation / refusal operation problem; the response speed is improved, the threshold adjustment delay is ≤100 ms, and the threshold adjustment process can quickly match the working condition changes; the manual intervention is reduced by 90%, since the misoperation rate is reduced, the number of repeated opening and closing of the circuit breaker is reduced, and the service life of the circuit breaker is extended by 30%; and the terminal temperature can reflect the phenomena of gradual change of contact resistance, local overheating, etc.

[0082] In some embodiments, referring to Figure 2 The circuit breaker includes a sensor layer, a processing layer, and an execution layer. The sensor layer includes a temperature sensor, a current sensor, and an environment sensor, the temperature sensor is used to collect the terminal temperature of the circuit breaker, the current sensor is used to collect the actual current of the circuit breaker, and the environment sensor is used to collect the environment temperature. The processing layer performs thermal-electric model (i.e. thermal-electric coupling model) calculation and dynamic threshold optimization, and the dynamic threshold optimization is realized based on a threshold adjustment formula. The execution layer includes a tripping logic and a warning module, the tripping logic is used to receive the circuit breaker threshold at the current time and judge whether to trigger a protection action (open the circuit breaker), and the warning module is used to send a warning signal after the circuit breaker is cut off.

[0083] In some embodiments, referring to Figure 3 The adjustment method of the circuit breaker threshold specifically includes:

[0084] Step S1: data collection.

[0085] The terminal temperature of the circuit breaker, the environment temperature, the temperature difference limit value, and the circuit breaker threshold at the last time are obtained.

[0086] Step S2: temperature difference calculation and model generation.

[0087] The difference between the terminal temperature of the circuit breaker and the predicted temperature is calculated to obtain a temperature difference result; and a thermal-electric coupling model is generated.

[0088] Step S3: threshold adjustment and parameter update.

[0089] The threshold adjustment and parameter update are realized according to the threshold adjustment formula.

[0090] In some embodiments, the cold start pre-calibration experimental data is shown in Table 1, wherein the measured temperature rise refers to the temperature rise value of the terminal temperature of the circuit breaker.

[0091] Table 1

[0092] Current (A) Measured temperature rise (°C) Predicted temperature (°C) Initial misoperation rate 100 15.2 15.0 0.5％ 200 32.8 33.5 0.7％

[0093] In the scenario of suppressing motor start-up malfunction, I = 6 × In, I = 2400A, duration is 2 seconds, ambient temperature is 30℃, actual measured circuit breaker terminal temperature is 60℃, predicted temperature is 100℃, and temperature difference is +40℃. At this point, I is calculated to... th =1.1×I th0 The circuit breaker threshold has been relaxed, allowing for short-term overload without malfunctioning triggering.

[0094] In a latent contact failure warning scenario, terminal oxidation occurs at the LI phase terminals of the circuit breaker, causing the terminal internal resistance to rise from 0.1mΩ to 0.8mΩ. Terminal oxidation indicates aging, making the terminals more prone to overheating compared to their factory condition. This results in a large difference between the actual and predicted terminal temperatures. According to the threshold adjustment formula, this should be considered a latent fault, and the circuit breaker threshold should be reduced. Calculations show that the temperature difference ΔT corresponding to the LI phase terminals is 25℃, and the magnetic field distortion rate ΔB is 22%. The circuit breaker threshold corresponding to the LI phase terminals should be adjusted as follows: I th =0.8×I th0 A warning is issued 14 days in advance.

[0095] On the other hand, see Figure 4 As shown in the figure, this application embodiment provides a circuit breaker threshold adjustment device, including:

[0096] The acquisition module 401 is used to acquire the terminal temperature, ambient temperature, temperature difference limit value, and circuit breaker threshold value of the circuit breaker at the previous moment.

[0097] The calculation module 402 is used to calculate the temperature difference result when the difference between the terminal temperature of the circuit breaker and the ambient temperature is less than a first preset value; the temperature difference result is obtained based on the difference between the terminal temperature of the circuit breaker and the predicted temperature; the predicted temperature is calculated based on the ambient temperature.

[0098] The adjustment module 403 is used to adjust the circuit breaker threshold at the previous moment based on the temperature difference result and the temperature difference limit value, so as to obtain the circuit breaker threshold at the current moment.

[0099] In some embodiments, the adjustment module 403 is specifically used to: compare the terminal temperature of the circuit breaker with the predicted temperature; and when the terminal temperature of the circuit breaker is lower than the predicted temperature, amplify the circuit breaker threshold at the previous moment based on the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold at the current moment.

[0100] In some embodiments, the adjustment module 403 is specifically configured to: determine that the circuit breaker threshold at the current moment is equal to the circuit breaker threshold at the previous moment when the terminal temperature of the circuit breaker is equal to the predicted temperature.

[0101] In some embodiments, the adjusting module 403 is specifically configured to: in a case where the terminal temperature of the circuit breaker is greater than the predicted temperature, reducing the circuit breaker threshold value at the previous moment according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value at the current moment.

[0102] In some embodiments, the calculating module 402 is further configured to: in a case where the difference between the terminal temperature of the circuit breaker and the ambient temperature is greater than or equal to the first preset value, calculating a multiplication result of the circuit breaker threshold value at the previous moment and the reduction coefficient to obtain the circuit breaker threshold value at the current moment.

[0103] The embodiments of the present application provide a circuit breaker, the circuit breaker is provided with an electronic device, the electronic device includes a processor and a memory for storing processor-executable instructions, and the processor implements the steps of any one of the above-mentioned circuit breaker threshold value adjustment methods when executing the instructions.

[0104] The embodiments of the present application provide a storage medium having computer instructions stored thereon, and the instructions are executed by a processor to implement the steps of any one of the above-mentioned circuit breaker threshold value adjustment methods.

[0105] In the embodiments of the present application, the storage medium can be a disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0106] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0107] The above describes in detail the circuit breaker threshold value adjustment method, device, circuit breaker, and storage medium provided by the embodiments of the present application. The principle and implementation manner of the present application are described by applying specific examples in this paper, and the above embodiment description is only used to help understand the method and its core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and application range will be changed, and the above description should not be understood as the limitation of the present application.

Claims

1. A method of adjusting a threshold of a circuit breaker, characterized by, The method comprises: obtaining a terminal temperature of a circuit breaker, an ambient temperature, a temperature difference limit value, and a circuit breaker threshold value of a previous time; in a case where a difference between the terminal temperature of the circuit breaker and the ambient temperature is less than a first preset value, calculating a temperature difference result; the temperature difference result is obtained based on a difference between the terminal temperature of the circuit breaker and a predicted temperature; the predicted temperature is calculated according to the ambient temperature; adjusting the circuit breaker threshold value of the previous time according to the temperature difference result and the temperature difference limit value to obtain a circuit breaker threshold value of a current time.

2. The method of claim 1, wherein, adjusting the circuit breaker threshold value of the previous time according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value of the current time, comprises: comparing the terminal temperature of the circuit breaker with the predicted temperature; in a case where the terminal temperature of the circuit breaker is less than the predicted temperature, amplifying the circuit breaker threshold value of the previous time according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value of the current time.

3. The method of claim 2, wherein, after comparing the terminal temperature of the circuit breaker with the predicted temperature, the method further comprises: in a case where the terminal temperature of the circuit breaker is equal to the predicted temperature, determining that the circuit breaker threshold value of the current time is equal to the circuit breaker threshold value of the previous time.

4. The method of claim 2, wherein, after comparing the terminal temperature of the circuit breaker with the predicted temperature, the method further comprises: in a case where the terminal temperature of the circuit breaker is greater than the predicted temperature, reducing the circuit breaker threshold value of the previous time according to the temperature difference result and the temperature difference limit value to obtain the circuit breaker threshold value of the current time.

5. The method of claim 1, wherein, after obtaining the terminal temperature of the circuit breaker, the ambient temperature, the temperature difference limit value, and the circuit breaker threshold value of the previous time, the method further comprises: in a case where it is determined that the difference between the terminal temperature of the circuit breaker and the ambient temperature is greater than or equal to the first preset value, calculating a multiplication result of the circuit breaker threshold value of the previous time and a reduction coefficient to obtain the circuit breaker threshold value of the current time.

6. The method of claim 5, wherein, the reduction coefficient is equal to 0.

8.

7. The method of claim 1, wherein, the first preset value is equal to 15℃.

8. The method of claim 1, wherein, the temperature difference limit value is equal to 10℃.

9. A device for adjusting a threshold of a circuit breaker, characterized in that The method comprises: an obtaining module, configured to obtain a terminal temperature of a circuit breaker, an ambient temperature, a temperature difference limit value, and a circuit breaker threshold value of a previous time; a calculating module, configured to, in a case where a difference between the terminal temperature of the circuit breaker and the ambient temperature is less than a first preset value, calculate a temperature difference result; the temperature difference result is obtained based on a difference between the terminal temperature of the circuit breaker and a predicted temperature; the predicted temperature is calculated according to the ambient temperature; an adjusting module, configured to adjust the circuit breaker threshold value of the previous time according to the temperature difference result and the temperature difference limit value to obtain a circuit breaker threshold value of a current time.

10. A circuit breaker characterized by, The circuit breaker is provided with an electronic device, and the electronic device comprises a processor and a memory for storing processor-executable instructions; when the processor executes the instructions, the steps of the method in any one of claims 1 to 8 are implemented.

11. A storage medium, characterized by A computer instruction is stored thereon, and the instruction is executed by a processor to implement the steps of the method in any one of claims 1 to 8.

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