CN107192941B

CN107192941B - Analysis method and management method for dynamic load capacity of circuit breaker

Info

Publication number: CN107192941B
Application number: CN201710304832.6A
Authority: CN
Inventors: 刘育权; 陆国俊; 栾乐; 肖天为; 刘俊翔; 殷晓刚; 刘宇; 骆虎
Original assignee: Guangzhou Power Supply Bureau Co Ltd; Xian High Voltage Apparatus Research Institute Co Ltd
Current assignee: Guangzhou Power Supply Bureau Co Ltd; Xian High Voltage Apparatus Research Institute Co Ltd
Priority date: 2017-05-03
Filing date: 2017-05-03
Publication date: 2021-02-05
Anticipated expiration: 2037-05-03
Also published as: CN107192941A

Abstract

The invention relates to an analysis method and a management method for dynamic load capacity of a circuit breaker, wherein the analysis method comprises the following steps: presetting a threshold value; a judging step, wherein the judging step comprises a real-time judging step, an accumulation judging step and an electric service life judging step; and adopting at least one judgment step to synthesize the real-time data evaluation result of the dynamic load of the circuit breaker, the accumulated data evaluation result of the dynamic load of the circuit breaker and the possible electric service life evaluation result of the dynamic load of the circuit breaker to obtain and output the evaluation result of the dynamic load of the circuit breaker. According to the invention, real-time analysis and evaluation are carried out according to the property and the size of the current of the main loop of the circuit breaker, and the margin of various currents borne by the circuit breaker, the load which can be increased and possible faults which can be borne by the circuit breaker are judged, so that basic support is provided for the management of the circuit breaker, the fault rate can be avoided, the fault-free running time of the circuit breaker is prolonged, and the service life of the circuit breaker is prolonged.

Description

Analysis method and management method for dynamic load capacity of circuit breaker

Technical Field

The invention relates to the field of switch equipment, in particular to an analysis method and a management method for dynamic load capacity of a circuit breaker.

Background

A circuit breaker (circuit breaker) is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and closing, carrying, and opening/closing a current under an abnormal circuit condition for a prescribed time. In the field of switchgear, circuit breakers are the primary devices used for power distribution control, and are important devices for extinguishing fault currents and isolating faulty devices and lines from the grid. And when the circuit breaker is in a conducting state, the transmission of electric energy is realized. In the breaking process of the circuit breaker, electric energy transmission is cut off, and fault current is cut off when a power grid fails.

In the process of transmitting electric energy by the circuit breaker, the circuit breaker uses rated current to represent the rated current which can be borne by a main circuit, and a test method of temperature rise test is used for testing the capacity of the main circuit of the circuit breaker for bearing the rated current. The circuit breaker uses the open current of the capacitive load to represent the current value of the main circuit when the contact of the main circuit can be opened under the capacitive load. The circuit breaker uses rated lightning impulse voltage and rated operation impulse voltage to represent the insulation bearing capacity between the main circuit of the circuit breaker and ground potential and between phases.

When the circuit breaker operates in a power grid, the current of a main loop is continuously changed under the interaction of a power supply, load properties and load size, and the possibility of exceeding the allowable current value of the circuit breaker exists. The fault current that the main circuit may be subjected to is influenced by the interaction of the power supply including the generator and transformer, the nature of the fault current, the distance of the fault point, the magnitude of the fault line impedance, with the possibility of exceeding the rated short circuit breaking current or rated lightning impulse voltage or rated operating impulse voltage allowed by the circuit breaker.

At present, in terms of the circuit breaker, the protection of the power grid and the equipment is usually performed when a main circuit of the circuit breaker breaks down or when voltage exceeds allowable voltage, and the circuit breaker is judged and driven to be switched on and off, so that the power grid and the equipment are protected.

Disclosure of Invention

Based on the above, the invention provides an analysis method and a management method for dynamic load capacity of a circuit breaker.

For example, in the analysis method and the management method of the dynamic load capacity of the circuit breaker, the analysis method of the dynamic load capacity of the circuit breaker comprises the following steps:

presetting a threshold value: presetting a current allowable threshold, a main loop temperature rise allowable threshold and/or an electric life allowable arc energy threshold;

a judging step, wherein the judging step comprises a real-time judging step, an accumulation judging step and/or an electric life judging step; wherein the content of the first and second substances,

the real-time judging step comprises the following steps: calculating a current difference value between the real-time current value and the current allowable threshold value, and judging a dynamic load real-time data evaluation result of the circuit breaker according to the current difference value;

measuring or calculating the temperature difference value between the temperature rise value of the main loop and the allowable temperature rise threshold value of the main loop, and judging the real-time data evaluation result of the dynamic load of the circuit breaker according to the temperature difference value;

the accumulation judging step includes: calculating a real-time current variation trend, determining the time when the current variation trend reaches a current allowable threshold value, and judging an evaluation result of accumulated data of a dynamic load of the circuit breaker;

calculating the temperature rise value variation trend of the main loop, determining the time when the temperature rise variation trend of the main loop reaches the temperature rise allowable threshold value of the main loop, and judging the evaluation result of the dynamic load accumulated data of the circuit breaker;

the electrical life judging step includes: calculating possible current breaking arc energy, calculating accumulated current breaking arc energy, comparing the accumulated current breaking arc energy with an allowable electric arc energy threshold value of the electric life, and judging a possible electric life evaluation result of the dynamic load of the circuit breaker;

and adopting at least one judgment step to obtain at least one of a real-time data evaluation result of the dynamic load of the circuit breaker, an accumulated data evaluation result of the dynamic load of the circuit breaker and a possible electric service life evaluation result of the dynamic load of the circuit breaker, and forming and outputting an evaluation result of the dynamic load of the circuit breaker.

In one embodiment, the current allowable threshold comprises a resistive current allowable threshold, a capacitive current allowable threshold and an inductive current allowable threshold;

the threshold value presetting step specifically comprises the following steps:

the allowable threshold value of the resistive current is determined by the allowable temperature rise of a main circuit of the circuit breaker;

the allowable threshold value of the capacitive current is determined by the rated capacitive opening and closing current of the circuit breaker;

the inductive current allowable threshold value is determined by the maximum allowable inductive current value of the circuit breaker;

in one embodiment, the step of presetting the threshold specifically includes the following steps:

the temperature rise allowable threshold value of the main circuit is determined by the maximum allowable temperature rise of the main circuit of the circuit breaker;

the electric life allowable arc energy threshold is determined by the accumulated breaking current and the arcing time of the circuit breaker.

In one embodiment, calculating the current difference between the real-time current value and the current allowable threshold comprises the following steps:

acquiring a real-time current value and a real-time voltage value;

calculating the phase difference between the current phase and the voltage phase, and determining the current property according to the phase difference;

selecting a corresponding resistive current allowable threshold value or a capacitive current allowable threshold value or an inductive current allowable threshold value as a current allowable threshold value for subsequent calculation according to the current property;

and calculating the current difference value between the current allowable threshold value and the real-time current value.

In one embodiment, the step of judging the real-time data evaluation result of the dynamic load of the circuit breaker according to the current difference comprises the following steps:

under the condition that the real-time current value is smaller than the current allowable threshold value, the real-time data evaluation result of the dynamic load of the circuit breaker is normal, and the numerical value of the current difference value is the quantity which can be increased by the dynamic load;

and under the condition that the real-time current value is greater than the current allowable threshold value, the real-time data evaluation result of the dynamic load of the circuit breaker is abnormal, and the numerical value of the current difference value is the number of the dynamic load exceeding.

In one embodiment, the step of calculating the temperature difference between the main loop temperature rise value and the main loop temperature rise allowable threshold value comprises the following steps:

acquiring a main loop temperature rise value;

and calculating the temperature difference between the temperature rise allowable threshold value of the main loop and the temperature rise value of the main loop.

In one embodiment, the step of judging the real-time data evaluation result of the dynamic load of the circuit breaker according to the temperature difference comprises the following steps:

under the condition that the temperature rise value of the main loop is smaller than the allowable temperature rise threshold value of the main loop, the real-time data evaluation result of the dynamic load of the circuit breaker is normal, and the numerical value of the temperature difference value is the temperature rise number of the main loop, which is possibly increased by the dynamic load;

and under the condition that the temperature rise value of the main loop is greater than the allowable temperature rise threshold value of the main loop, the real-time data evaluation result of the dynamic load of the circuit breaker is abnormal, and the numerical value of the temperature difference value is the temperature rise quantity of the main loop, which is exceeded by the dynamic load.

In one embodiment, the step of calculating the real-time current variation trend, determining the time when the current variation trend reaches the current allowable threshold value and further determining the evaluation result of the accumulated data of the dynamic load of the circuit breaker comprises the following steps:

calculating the trend of the current value changing along with the time according to the statistical data of the real-time current changing along with the time;

determining the time for reaching the current allowable threshold value according to the trend of the real-time current value and the trend of the current value changing along with the time;

judging the evaluation result of the dynamic load accumulated data of the circuit breaker according to the time required for reaching the current allowable threshold; for example, in the case where the current allowable threshold value will be reached within a preset short time, the time required for determining that the dynamic load of the circuit breaker reaches the current allowable threshold value is the time allowed for the dynamic load evaluation to be maintained in accordance with the current trend.

In one embodiment, the step of calculating the change trend of the main circuit temperature rise value, determining the time when the change trend of the main circuit temperature rise reaches the allowable main circuit temperature rise threshold value and judging the evaluation result of the accumulated data of the dynamic load of the circuit breaker comprises the following steps:

determining the trend of temperature rise monitoring data changing along with time according to the real-time temperature rise monitoring value;

determining the time for reaching the allowable threshold value of the temperature rise of the main loop according to the trend of the real-time temperature rise monitoring value and the trend of the accumulated temperature rise monitoring data along with the change of time;

judging the evaluation result of the dynamic load accumulated data of the circuit breaker according to the time required for reaching the temperature rise allowable threshold value of the main loop; for example, in the case where the main circuit temperature rise allowable threshold value will be reached in a short time, the time required for the dynamic load of the circuit breaker to reach the main circuit temperature rise allowable threshold value is determined as the time allowed for the dynamic load evaluation to be maintained according to the current trend.

In one embodiment, the method comprises the following steps of calculating possible current breaking arc energy, calculating accumulated current breaking arc energy, comparing the accumulated current breaking arc energy with an allowable electric arc energy threshold value of the electric life, and judging a possible electric life evaluation result of the dynamic load of the circuit breaker, wherein the method specifically comprises the following steps:

the possible current breaking arc energy is obtained by calculating the real-time current value and the set arc time;

the accumulated current breaking arc energy is obtained by calculating and superposing the current values of all the circuit breakers which are subjected to breaking and the set arcing time;

judging a possible electric service life evaluation result of the dynamic load of the circuit breaker, and obtaining the difference after comparing the sum of the accumulated current breaking arc energy of the occurred breaking current and the arc energy which is possibly increased when the real-time current is broken with the allowable electric service life electric arc energy threshold value; when the estimated result is smaller than the electric life allowable arc energy threshold value, the estimated result comprises a difference value between the estimated result and the electric life allowable arc energy threshold value; when the estimated result is greater than or equal to the electric life allowable arc energy threshold value, the estimated result comprises a difference value of an exceeding part of the estimated result.

For example, the management method of the dynamic load capacity of the circuit breaker comprises any one of the analysis methods of the dynamic load capacity of the circuit breaker, and the load of the circuit breaker is adjusted according to the evaluation result of the dynamic load of the circuit breaker.

According to the analysis method and the management method, real-time analysis and evaluation are carried out according to the property and the size of the current of the circuit breaker, and the margin of various currents borne by the circuit breaker, the load which can be increased and the possible faults which can be borne by the circuit breaker are judged, so that basic support is provided for the management of the circuit breaker, the fault rate can be avoided, the fault-free running time of the circuit breaker is prolonged, and the service life of the circuit breaker is prolonged.

Drawings

Fig. 1 is a schematic flow chart illustrating an embodiment of a method for analyzing a dynamic load capacity of a circuit breaker according to the present invention.

Fig. 2 is a schematic flow chart illustrating a method for analyzing dynamic load capacity of a circuit breaker according to another embodiment of the present invention.

Fig. 3 is a schematic flow chart illustrating an analysis method for dynamic load capacity of a circuit breaker according to another embodiment of the present invention.

Fig. 4 is a flowchart illustrating an embodiment of a method for managing dynamic load capacity of a circuit breaker according to the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention provides an analysis method and a management method for dynamic load capacity of a circuit breaker, and one embodiment of the invention is the analysis method for the dynamic load capacity of the circuit breaker, which comprises the following steps: judging the current property; judging the dynamic load condition of the circuit breaker according to the current property; and outputting a dynamic load analysis result of the circuit breaker. For example, a method for analyzing dynamic load capacity of a circuit breaker, comprising the steps of: acquiring a real-time current value and a real-time voltage value; calculating the current phase difference and the voltage phase difference; judging the current property; judging the dynamic load condition of the circuit breaker according to the current property; outputting a dynamic load analysis result of the circuit breaker; wherein, the current property is judged according to the calculation result of the current phase difference and the voltage phase difference. For example, a real-time current value and a real-time voltage value are input; as another example, a real-time current value and a real-time voltage value of the circuit breaker are input; for another example, a real-time current value and a real-time voltage value of the circuit breaker are obtained; for another example, a real-time current value and a real-time voltage value of a main loop of the circuit breaker are obtained; for another example, the real-time current value and the real-time voltage value are the real-time current value and the real-time voltage value of the main circuit of the circuit breaker; for another example, the real-time current value and the real-time voltage value are the real-time current value and the real-time voltage value at a certain detection position of the main circuit of the circuit breaker; like this, through judging the dynamic load condition of circuit breaker according to the electric current nature, especially the real-time current condition through circuit breaker major loop etc. can judge the circuit breaker and bear the margin of all kinds of electric currents, the load that can increase, the possible trouble that can bear to for the management of circuit breaker provides basic support, can avoid the fault rate, prolong the no trouble operating time of circuit breaker and promote the life of circuit breaker.

For example, the analysis method of the dynamic load capacity of the circuit breaker comprises the following steps: analyzing the current property, comparing according to the current property, including comparing real-time current allowable threshold values, calculating the current change trend of the load and comparing the current change allowable threshold values, calculating the possible on-off energy of the load current and comparing the current life allowable threshold values, judging the dynamic load condition of the circuit breaker, realizing the dynamic load capacity evaluation of the circuit breaker, and outputting the dynamic load analysis result of the circuit breaker. The possible on-off energy of the load current is calculated by the real-time current value of the load of the circuit breaker and the longest on-off time of the load current. Wherein, the comparison is performed according to the current properties, including capacitive current comparison, inductive current comparison and/or resistive current comparison. The threshold values are also called threshold values, and include a real-time current allowable threshold value, a current change allowable threshold value, an electric service life allowable threshold value, a main circuit temperature rise change allowable threshold value and the like, and are set according to parameters of the circuit breaker, for example, the insulation bearing capacity of the circuit breaker is set or the threshold values are obtained through test verification, and the like, and/or are adjusted according to application or actual conditions; for example, the real-time current allowable threshold includes an inductive current allowable threshold, a capacitive current allowable threshold, a resistive current allowable threshold, and the like; as another example, the electric life allowable threshold includes an electric life allowable arc energy threshold, an electric life allowable energy threshold, and the like. For example, the inductive current allowable threshold, which may also be referred to as an inductive load current comparison threshold, is obtained by experimental verification according to the insulation bearing capacity of the circuit breaker, and so on. Therefore, according to the real-time current and voltage data of the circuit breaker, the limit allowable current value of the circuit breaker and the temperature rise monitoring data of the main circuit of the circuit breaker, a value comparison method and a value variation trend comparison method are adopted to analyze the current property, compare the real-time current allowable threshold value, calculate the current variation trend and compare the current allowable threshold value, calculate the possible on-off energy of the load current and compare the current life allowable threshold value, determine the allowable variation range of the current, and realize the analysis and evaluation of the dynamic load capacity of the circuit breaker.

For example, a method for analyzing dynamic load capacity of a circuit breaker, comprising the steps of: presetting a threshold value and judging steps, and synthesizing a real-time data evaluation result of the dynamic load of the circuit breaker, an accumulated data evaluation result of the dynamic load of the circuit breaker and/or a possible electric service life evaluation result of the dynamic load of the circuit breaker by adopting at least one judging step to obtain and output an evaluation result of the dynamic load of the circuit breaker. For example, the step of presetting the threshold value comprises presetting a current allowable threshold value, a main loop temperature rise allowable threshold value and/or an electric life allowable arc energy threshold value; for example, the judging step includes a real-time judging step, an accumulation judging step and/or an electric life judging step; for example, the real-time determining step includes: calculating a current difference value between the real-time current value and the current allowable threshold value, and judging a dynamic load real-time data evaluation result of the circuit breaker according to the current difference value; measuring or calculating the temperature difference value between the temperature rise value of the main loop and the allowable temperature rise threshold value of the main loop, and judging the real-time data evaluation result of the dynamic load of the circuit breaker according to the temperature difference value; for example, the accumulation judging step includes: calculating a real-time current change trend, determining the time when the current change trend reaches a current allowable threshold value, and judging an evaluation result of accumulated data of the dynamic load of the circuit breaker; calculating the temperature rise value variation trend of the main loop, determining the time when the temperature rise variation trend of the main loop reaches the temperature rise allowable threshold value of the main loop, and judging the evaluation result of the dynamic load accumulated data of the circuit breaker; for example, the electrical lifetime judging step includes: calculating possible current breaking arc energy, calculating accumulated current breaking arc energy, comparing the accumulated current breaking arc energy with an allowable electric arc energy threshold value of the electric life, and judging a possible electric life evaluation result of the dynamic load of the circuit breaker; for example, the method comprises the steps of judging at least one of a real-time judging step, an accumulated judging step and/or an electric life judging step to obtain a real-time data evaluation result of the dynamic load of the circuit breaker, an accumulated data evaluation result of the dynamic load of the circuit breaker and/or a possible electric life evaluation result of the dynamic load of the circuit breaker, and forming and outputting an evaluation result of the dynamic load of the circuit breaker.

In one embodiment, the current allowable threshold comprises a resistive current allowable threshold, a capacitive current allowable threshold and an inductive current allowable threshold; the threshold value presetting step specifically comprises the following steps: the allowable threshold value of the resistive current is determined by the allowable temperature rise of a main circuit of the circuit breaker; the allowable threshold value of the capacitive current is determined by the rated capacitive opening and closing current of the circuit breaker; the inductive current allowable threshold value is determined by the maximum allowable inductive current value of the circuit breaker; for another example, the step of presetting the threshold specifically includes the following steps: the temperature rise allowable threshold value of the main circuit is determined by the maximum allowable temperature rise of the main circuit of the circuit breaker; the electric life allowable arc energy threshold is determined by the accumulated breaking current and the arcing time of the circuit breaker. For another example, the step of presetting the threshold specifically includes the following steps: the allowable threshold value of the resistive current is determined by the allowable temperature rise of a main circuit of the circuit breaker; the allowable threshold value of the capacitive current is determined by the rated capacitive opening and closing current of the circuit breaker; the inductive current allowable threshold value is determined by the maximum allowable inductive current value of the circuit breaker; the temperature rise allowable threshold value of the main circuit is determined by the maximum allowable temperature rise of the main circuit of the circuit breaker; the electric life allowable arc energy threshold is determined by the accumulated breaking current and the arcing time of the circuit breaker.

In one embodiment, calculating the current difference between the real-time current value and the current allowable threshold comprises the following steps: acquiring a real-time current value and a real-time voltage value; calculating the phase difference between the current phase and the voltage phase, and determining the current property according to the phase difference; selecting a corresponding resistive current allowable threshold value or a capacitive current allowable threshold value or an inductive current allowable threshold value as a current allowable threshold value for subsequent calculation according to the current property; and calculating the current difference value between the current allowable threshold value and the real-time current value.

In one embodiment, the step of judging the real-time data evaluation result of the dynamic load of the circuit breaker according to the current difference comprises the following steps: under the condition that the real-time current value is smaller than the current allowable threshold value, the real-time data evaluation result of the dynamic load of the circuit breaker is normal, and the numerical value of the current difference value is the quantity which can be increased by the dynamic load; and under the condition that the real-time current value is greater than the current allowable threshold value, the real-time data evaluation result of the dynamic load of the circuit breaker is abnormal, and the numerical value of the current difference value is the number of the dynamic load exceeding.

In one embodiment, the step of calculating the temperature difference between the main loop temperature rise value and the main loop temperature rise allowable threshold value comprises the following steps: acquiring a main loop temperature rise value; and calculating the temperature difference between the temperature rise allowable threshold value of the main loop and the temperature rise value of the main loop.

In one embodiment, the step of judging the real-time data evaluation result of the dynamic load of the circuit breaker according to the temperature difference comprises the following steps: under the condition that the temperature rise value of the main loop is smaller than the allowable temperature rise threshold value of the main loop, the real-time data evaluation result of the dynamic load of the circuit breaker is normal, and the numerical value of the temperature difference value is the temperature rise number of the main loop, which is possibly increased by the dynamic load; and under the condition that the temperature rise value of the main loop is greater than the allowable temperature rise threshold value of the main loop, the real-time data evaluation result of the dynamic load of the circuit breaker is abnormal, and the numerical value of the temperature difference value is the temperature rise quantity of the main loop, which is exceeded by the dynamic load.

In one embodiment, the step of calculating the real-time current variation trend, determining the time when the current variation trend reaches the current allowable threshold value and further determining the evaluation result of the accumulated data of the dynamic load of the circuit breaker comprises the following steps: calculating the trend of the current value changing along with the time according to the statistical data of the real-time current changing along with the time; determining the time for reaching the current allowable threshold value according to the trend of the real-time current value and the trend of the current value changing along with the time; and judging the evaluation result of the dynamic load accumulated data of the circuit breaker according to the time required for reaching the current allowable threshold. For example, in the case where the current allowable threshold value will be reached within a preset short time, the time required for determining that the dynamic load of the circuit breaker reaches the current allowable threshold value is the time allowed for the dynamic load evaluation to be maintained in accordance with the current trend.

In one embodiment, the step of calculating the change trend of the main circuit temperature rise value, determining the time when the change trend of the main circuit temperature rise reaches the allowable main circuit temperature rise threshold value and judging the evaluation result of the accumulated data of the dynamic load of the circuit breaker comprises the following steps: determining the trend of temperature rise monitoring data changing along with time according to the real-time temperature rise monitoring value; determining the time for reaching the allowable threshold value of the temperature rise of the main loop according to the trend of the real-time temperature rise monitoring value and the trend of the accumulated temperature rise monitoring data along with the change of time; and judging the evaluation result of the dynamic load accumulated data of the circuit breaker according to the time required for reaching the temperature rise allowable threshold value of the main circuit. For example, in the case where the main circuit temperature rise allowable threshold value will be reached in a short time, the time required for the dynamic load of the circuit breaker to reach the main circuit temperature rise allowable threshold value is determined as the time allowed for the dynamic load evaluation to be maintained according to the current trend.

In one embodiment, the method comprises the following steps of calculating possible current breaking arc energy, calculating accumulated current breaking arc energy, comparing the accumulated current breaking arc energy with an allowable electric arc energy threshold value of the electric life, and judging a possible electric life evaluation result of the dynamic load of the circuit breaker, wherein the method specifically comprises the following steps: the possible current breaking arc energy is obtained by calculating the real-time current value and the set arc time; the accumulated current breaking arc energy is obtained by calculating and superposing the current values of all the circuit breakers which are subjected to breaking and the set arcing time; judging a possible electric service life evaluation result of the dynamic load of the circuit breaker, and obtaining the difference after comparing the sum of the accumulated current breaking arc energy of the occurred breaking current and the arc energy which is possibly increased when the real-time current is broken with the allowable electric service life electric arc energy threshold value; when the estimated result is smaller than the electric life allowable arc energy threshold value, the estimated result comprises a difference value between the estimated result and the electric life allowable arc energy threshold value; when the estimated result is greater than or equal to the electric life allowable arc energy threshold value, the estimated result comprises a difference value of an exceeding part of the estimated result.

In one embodiment, determining breaker dynamic load conditions based on current properties includes the steps of: comparing the real-time current value with a real-time current allowable threshold value; comparing the current change trend with a current change allowable threshold value; comparing the allowable threshold value of the service life. For example, comparing the allowable threshold of the power life includes the following steps: and calculating the accumulated on-off energy of the circuit breaker according to the real-time current numerical value, judging whether the accumulated on-off energy is greater than the electric service life allowable energy threshold value of the circuit breaker, and judging that the electric service life of the load of the circuit breaker exceeds the limit if the accumulated on-off energy is greater than the electric service life allowable energy threshold value. For example, the electricity lifetime allowable threshold includes an electricity lifetime allowable energy threshold, and comparing the electricity lifetime allowable threshold includes the following steps: comparing the current breaking arc energy with an allowable electric arc energy threshold value of the electric service life of the circuit breaker, and/or comparing the accumulated breaking energy with the allowable electric arc energy threshold value of the electric service life; for another example, the electric life allowable threshold includes an electric life allowable arc energy threshold and an electric life allowable energy threshold. One example is shown in fig. 3, which obtains a real-time current value and a real-time voltage value; calculating the current phase difference and the voltage phase difference; judging the current property; for example, a phase difference of a current phase and a voltage phase is calculated, and a current property is determined according to the phase difference; selecting a corresponding resistive current allowable threshold value or a capacitive current allowable threshold value or an inductive current allowable threshold value as a current allowable threshold value for subsequent calculation according to the current property; for example, comparing the real-time current value with the real-time current allowable threshold value; comparing the current change trend with a current change allowable threshold value; comparing the allowable threshold value of the service life; and outputting a dynamic load analysis result of the circuit breaker. For example, the determined current properties include an inductive current, a capacitive current, and a resistive current, based on the phase difference. For example, determining breaker dynamic load conditions based on current properties includes the steps of: comparing the real-time current value with a real-time current allowable threshold value, and judging the dynamic load condition of the circuit breaker; comparing the current change trend with the current change allowable threshold value, and judging the dynamic load condition of the circuit breaker; comparing the allowable threshold value of the service life, and judging the dynamic load condition of the circuit breaker. As another example, determining a dynamic load condition of a circuit breaker based on a current property includes the steps of: comparing the real-time current value with a real-time current allowable threshold value, and judging the dynamic load condition of the circuit breaker; and/or comparing the current change trend with the current change allowable threshold value to judge the dynamic load condition of the circuit breaker; and/or comparing the allowable threshold value of the service life to judge the dynamic load condition of the circuit breaker. Therefore, the current load and the expected future load of the circuit breaker can be reasonably evaluated by judging the real-time current value, the current change trend, the electric service life and the like, so that the effective management of the load of the circuit breaker is favorably realized, the load can be properly increased when the load rate is lower, and the load can be properly reduced when the load rate is higher or is expected to be ultrahigh, so that the margin of various currents borne by the circuit breaker, the increased load and possible faults borne by the circuit breaker can be reasonably and effectively judged; like this, on the one hand can promote load efficiency, and on the other hand can promote the life of circuit breaker. It can be understood that the above thresholds, including the real-time current allowable threshold, the current variation allowable threshold, the electricity life allowable threshold, the main circuit temperature rise allowable threshold, and the like, may be set or adjusted according to actual conditions.

In one embodiment, the current properties include inductive current, capacitive current, and resistive current. For example, calculating the phase difference between the current phase angle and the voltage phase angle according to the real-time current value and the real-time voltage value; when the voltage phase leads the current phase, the current property is determined to be inductive current and the load is determined to be inductive load, when the voltage phase lags the current phase, the current property is determined to be capacitive current and the load is determined to be capacitive load, and when the voltage phase is the same as the current phase, the current property is determined to be resistive current and the load is determined to be resistive load. In this way, corresponding countermeasures can be given for different current properties. For example, comparing the real-time current value with the real-time current allowable threshold value includes the following steps: for the inductive current, judging whether the real-time current value is larger than an inductive current allowable threshold value of the circuit breaker, if so, judging that the load current of the circuit breaker exceeds the limit; for the capacitive current, judging whether the real-time current value is larger than a capacitive current allowable threshold value of the circuit breaker, if so, judging that the load current of the circuit breaker exceeds the limit; and for the resistive current, judging whether the real-time current value is larger than a resistive current allowable threshold value of the circuit breaker, and if so, judging that the load current of the circuit breaker exceeds the limit. For another example, comparing the real-time current value with the real-time current allowable threshold value includes the following steps: for the inductive current, judging whether the real-time current value is larger than an inductive current allowable threshold value of the circuit breaker, if so, obtaining an inductive current overrun judgment result, namely, judging that the inductive current of the load of the circuit breaker is overrun; for the capacitive current, judging whether the real-time current value is larger than a capacitive current allowable threshold value of the circuit breaker, if so, obtaining a capacitive current overrun judgment result, namely, judging that the capacitive current of the load of the circuit breaker is overrun; and for the resistive current, judging whether the real-time current value is larger than a resistive current allowable threshold value of the circuit breaker, if so, obtaining a resistive current overrun judgment result, namely, judging that the load resistive current of the circuit breaker is overrun. And when the dynamic load analysis result of the circuit breaker is output, outputting a current overrun judgment result, wherein the current overrun judgment result comprises an inductive current overrun judgment result, a capacitive current overrun judgment result and/or a resistive current overrun judgment result. Therefore, the real-time current values with different current properties are compared and judged with the corresponding inductive current allowable threshold value, the capacitive current allowable threshold value or the resistive current allowable threshold value, and a relatively accurate judgment result can be obtained, so that whether the load current of the circuit breaker exceeds the limit or not can be accurately analyzed.

For example, determining breaker dynamic load conditions based on current properties includes the steps of: comparing the real-time current value with a real-time current allowable threshold value according to the current property; comparing the current change trend with a current change allowable threshold value according to the current property; comparing the allowable threshold value of the service life according to the current property; after the above comparison, for another example, the method further comprises the following steps: and judging whether the load current of the circuit breaker exceeds the limit, for example, outputting the analysis result of the dynamic load of the circuit breaker if the load current of the circuit breaker exceeds the limit. Wherein, each comparison comprises comparing the real-time current value with the real-time current allowable threshold value; comparing the current change trend with a current change allowable threshold value; and/or comparing the allowable threshold value of the power life. In one embodiment, comparing the real-time current value with the real-time current allowable threshold value further includes the following steps: and calculating a heating temperature rise value formed by the real-time current value and the main loop resistor, judging whether the heating temperature rise value is greater than a main loop temperature rise allowable threshold value of the circuit breaker, and judging that the load temperature rise of the circuit breaker exceeds the limit if the heating temperature rise value is greater than the main loop temperature rise allowable threshold value. For example, after each comparison is performed according to the current property, the method further comprises the following steps: and calculating a heating temperature rise value formed by the real-time current value and the main loop resistor, judging whether the heating temperature rise value is greater than a main loop temperature rise allowable threshold value of the circuit breaker, and judging that the load temperature rise of the circuit breaker exceeds the limit if the heating temperature rise value is greater than the main loop temperature rise allowable threshold value. Therefore, whether the dynamic load condition of the circuit breaker is too high or not can be judged through the temperature rise condition, for example, the load is automatically reduced or the load reduction requirement is sent out when the dynamic load condition is too high, and the like, so that the fault rate of the circuit breaker is favorably reduced, the service life of the circuit breaker is prolonged, and the stability of a power grid system is enhanced.

For example, the comparison between the current change trend and the current change allowable threshold is realized by adopting a numerical calculation and numerical comparison method, and the current change trend of the breaker load comprises the change trend of the load current, the heating temperature rise change trend calculated by the current and loop resistance, the change trend of breaker temperature rise monitoring data and the like. In one embodiment, comparing the current variation trend with the current variation allowable threshold value includes the following steps: and calculating the real-time current value change and forming a current change trend together with the historical current value change, and judging the dynamic load accumulated data condition of the circuit breaker according to the difference between the current change trend and the current change allowable threshold value of the circuit breaker and the time when the current change trend reaches the current change allowable threshold value of the circuit breaker. For example, according to the real-time current value, the current real-time current value change of the current real-time current value and the previous real-time current value is calculated, and the current real-time current value change and the historical current value change form a current change trend together; for example, the current real-time current value change and a plurality of previous historical current value changes of preset quantity are combined to form a current change trend; for example, the current real-time current value change and the previous 5 to 100 historical current value changes are combined to form a current change trend; for example, a plurality of preset number of current value changes, such as historical current value changes, are combined to form a current change trend, and the current real-time current value changes are added to the current change trend to form the current change trend, so that the method is favorable for the data processing of a computer program and improves the operation efficiency; for another example, a FIFO mode is adopted, and the current real-time current numerical value change is added into the current change trend to jointly form the current change trend; for example, when the real-time current value number is sufficient, for example, the current variation trend includes N real-time current value variations, when the current real-time current value variation is added to the current variation trend, the current real-time current value variation is regarded as the N +1 th real-time current value variation, and the original 1 st real-time current value variation in the current variation trend is discarded or ignored. In this way, the current variation trend according to the current situation of the circuit breaker can be obtained.

In one embodiment, for the inductive current, calculating the real-time current value change and forming a current change trend together with the historical current value change, and judging the dynamic load accumulated data condition of the circuit breaker according to the difference between the current change trend and the inductive current change allowable threshold value of the circuit breaker and the time when the current change trend reaches the inductive current change allowable threshold value of the circuit breaker; for the capacitive current, calculating the real-time current value change and forming a current change trend together with the historical current value change, and judging the dynamic load accumulated data condition of the circuit breaker according to the difference between the current change trend and the allowable change threshold value of the capacitive current of the circuit breaker and the time when the current change trend reaches the allowable change threshold value of the capacitive current of the circuit breaker; and for the resistance current, calculating the real-time current value change and forming a current change trend together with the historical current value change, and judging the dynamic load accumulated data condition of the circuit breaker according to the difference between the current change trend and the resistance current change allowable threshold of the circuit breaker and the time when the current change trend reaches the resistance current change allowable threshold of the circuit breaker. Therefore, the current change trends with different current properties can be compared and judged with the corresponding inductive current change allowable threshold, capacitive current change allowable threshold or resistive current change allowable threshold, and a relatively accurate judgment result can be obtained, so that whether the dynamic load accumulated data of the circuit breaker exceeds the limit or not can be relatively accurately analyzed; and moreover, trend analysis can be provided, and the dynamic load accumulated data condition of the circuit breaker can be pre-judged in advance, so that countermeasures can be taken in time, and the fault rate of the circuit breaker can be reduced, the service life of the circuit breaker can be prolonged, and the stability of a power grid system can be enhanced.

In one embodiment, comparing the current variation trend with the current variation allowable threshold value further includes the following steps: and calculating a heating temperature rise value formed by the real-time current numerical value and the main circuit resistor, forming a main circuit temperature rise change trend by the heating temperature rise value change and the historical heating temperature rise value change together, and judging the dynamic load accumulated data condition of the circuit breaker according to the difference between the current main circuit temperature rise change trend and the main circuit temperature rise change allowable threshold value of the circuit breaker and the time when the current main circuit temperature rise change trend reaches the main circuit temperature rise change allowable threshold value of the circuit breaker. For example, after each current variation trend is determined according to the current property, that is, according to the difference between the current variation trend and the corresponding current variation allowable threshold of the circuit breaker and the time when the current variation trend reaches the corresponding current variation allowable threshold of the circuit breaker, the method further includes the following steps: and calculating a heating temperature rise value formed by the real-time current numerical value and the main circuit resistor, forming a main circuit temperature rise change trend by the heating temperature rise value change and the historical heating temperature rise value change together, and judging the dynamic load accumulated data condition of the circuit breaker according to the difference between the current main circuit temperature rise change trend and the main circuit temperature rise change allowable threshold value of the circuit breaker and the time when the current main circuit temperature rise change trend reaches the main circuit temperature rise change allowable threshold value of the circuit breaker. Therefore, whether the accumulated data condition of the dynamic load of the circuit breaker is too high or not can be judged through the temperature rise condition, for example, the load is automatically reduced or the load reduction requirement is sent out when the accumulated data condition is too high, so that the long-term condition of the dynamic load of the circuit breaker can be dealt with and processed in advance, the fault rate of the circuit breaker is reduced, the service life of the circuit breaker is prolonged, and the stability of a power grid system is enhanced.

In one embodiment, the electrical lifetime determination step comprises: calculating possible current breaking arc energy, calculating accumulated current breaking arc energy, comparing the accumulated current breaking arc energy with an allowable electric arc energy threshold value of the electric life, and judging a possible electric life evaluation result of the dynamic load of the circuit breaker; for example, comparing the allowable threshold of the power life includes the following steps: comparing the accumulated on-off energy with an allowable energy threshold value of the electric service life; and/or comparing the current breaking arc energy with the allowable arc energy threshold value of the electric service life; for example, according to the current breaking arc energy and the longest load current breaking time, the accumulated breaking energy of the circuit breaker is calculated, and then the accumulated breaking energy is compared with the allowable energy threshold value of the electric service life; and if the current is larger than the allowable arc energy threshold of the electric service life of the circuit breaker, judging that the electric service life of the load of the circuit breaker exceeds the limit. For example, the possible current breaking arc energy and the longest load current breaking time are calculated according to the real-time current value, the accumulated breaking energy of the circuit breaker is calculated, whether the accumulated breaking energy is larger than the allowable energy threshold value of the electric life of the circuit breaker or not is judged, and if yes, the electric life of the load of the circuit breaker is judged to be out of limit. Therefore, the electric service life of the circuit breaker or the electric service life of the load of the circuit breaker can be determined according to the current breaking arc energy or accumulated breaking energy, and the long-term condition of the dynamic load of the circuit breaker is pre-judged in advance, so that the margin of various currents borne by the circuit breaker, the load capable of being increased and possible faults capable of being borne by the circuit breaker are judged, and basic support is provided for the management of the circuit breaker.

For example, referring to fig. 1 and fig. 2 together, the method for analyzing the dynamic load capacity of the circuit breaker of the present invention includes the following four steps.

First, a real-time current value and a real-time voltage value are obtained, for example, the real-time current value (also called real-time current data) and the real-time voltage value (also called real-time voltage data) are input, a current phase and voltage phase difference is calculated, and the current property is determined to be an inductive current, a capacitive current or a resistive current. Namely, the property of the load current is judged, and the input quantity is a real-time current value and a real-time voltage value of a main loop of the circuit breaker. The method is numerical calculation. According to the method, the phase difference between the current phase angle and the voltage phase angle is calculated according to the real-time current data and the voltage data of the circuit breaker. And when the voltage phase is the same as the current phase, determining the voltage phase as an inductive current and determining the load as an inductive load.

And secondly, realizing real-time data evaluation of the load current of the circuit breaker. For example, the real-time current value is compared with the allowable threshold value, that is, the real-time current value is compared with the allowable threshold value, so that the real-time data evaluation of the load current of the circuit breaker is realized. For example, the input quantity is a real-time current value of a main circuit of the circuit breaker, an inductive current allowable threshold value of the circuit breaker, a capacitive current allowable threshold value, a resistive current allowable threshold value, a resistance value of the main circuit, a temperature rise allowable threshold value of the main circuit and a temperature rise value of the main circuit. For example, the allowable threshold value of capacitive current, the allowable threshold value of resistive current and the allowable threshold value of main loop temperature rise of the circuit breaker are obtained by relevant standards, and the comparison of inductive load current with the threshold value is obtained by test verification according to the insulation bearing capacity of the circuit breaker; the resistance value of the main loop is provided by a breaker manufacturer; the real-time current value and the temperature rise value of the main loop are provided by a circuit breaker operator. The method comprises numerical calculation and numerical comparison. The method comprises the following steps of calculating the difference between a real-time current value and the threshold values of the allowable inductive current of the circuit breaker and the allowable capacitive current of the circuit breaker for the inductive current and the capacitive current, and when the real-time value exceeds the threshold value of the allowable current, representing that the load of the circuit breaker exceeds the allowable range of a product, realizing preliminary evaluation of the inductive dynamic load capacity of the circuit breaker and realizing evaluation of the capacitive dynamic load capacity of the circuit breaker. For the resistive current, firstly, calculating the difference between a real-time current value and a threshold value of the allowable resistive current of the circuit breaker, and when the real-time value exceeds the threshold value of the allowable current, representing that the load of the circuit breaker exceeds the allowable range of a product, so as to realize the preliminary evaluation of the resistive dynamic load capacity of the circuit breaker; and secondly, calculating the heating temperature rise formed by the real-time current and the main loop resistor, comparing the difference between the calculated temperature rise result and the allowable temperature rise threshold value of the circuit breaker, and when the calculated result exceeds the allowable temperature rise threshold value, indicating that the load of the circuit breaker possibly exceeds the allowable range of the product. Therefore, real-time evaluation of the load current data of the circuit breaker is realized.

And thirdly, evaluating historical accumulated data of the load current of the circuit breaker. For example, comparing the current variation trend with an allowable threshold value, that is, comparing the current variation trend with the allowable threshold value of current variation, the historical accumulated data evaluation of the load current of the circuit breaker is realized. For example, the input quantities are real-time current values, accumulated inductive current values, accumulated capacitive current values, accumulated resistive current change values and accumulated main circuit temperature rise change values of the main circuit of the circuit breaker, and are provided by an operator of the circuit breaker. The method includes numerical calculation and numerical comparison, and it should be noted that the specific numerical calculation and numerical comparison can be implemented by using the existing mathematical method, for example, conveniently implemented by a computer, which is not described herein again, and the other embodiments are also the same. For example, the specific implementation mode is that the real-time current change of the breaker is calculated and forms a current change trend with a historical accumulated current value, the difference between the current trend value and the breaker current allowable current threshold value is calculated based on the current change trend, and the dynamic load capacity evaluation of the breaker load current change accumulated data is realized based on the time when the change trend reaches the breaker allowable current threshold value. Calculating the current variation trend for the inductive current and the capacitive current, and calculating the time reaching the allowable inductive current threshold value and the allowable capacitive current threshold value of the circuit breaker based on the variation trend to realize the dynamic load evaluation of the inductive load and the capacitive load of the circuit breaker; wherein for the resistance current, the current variation trend is calculated, the time reaching the allowable resistance current threshold value of the circuit breaker is calculated based on the variation trend, the dynamic load evaluation of the resistance load of the circuit breaker and the capacitive load of the circuit breaker is realized, and further, calculating the variation trend of the heating temperature rise formed by the real-time resistive current of the circuit breaker and the resistance of the main loop, calculating the time for reaching the allowable temperature rise threshold of the circuit breaker based on the variation trend of the temperature rise, realizing further evaluation of the resistive dynamic load capacity of the circuit breaker, thereby realizing the resistive load evaluation of the circuit breaker, meanwhile, calculating the temperature rise change trend based on the actual temperature rise monitoring data and the accumulated data of the main circuit of the circuit breaker, comparing the allowable temperature rise threshold value of the circuit breaker, realizing the load evaluation based on the temperature rise accumulated data change trend of the circuit breaker, and meanwhile, current and resistance calculation temperature rise data of the circuit breaker are corrected based on actual temperature rise monitoring data of a main circuit of the circuit breaker.

And fourthly, evaluating historical accumulated data of the current breaking and breaking life of the circuit breaker. For example, historical accumulated data evaluation of the current breaking service life of the circuit breaker is realized by comparing the allowable threshold value of the current service life. For example, the input quantities are breaker cumulative open arc energy and real time current magnitude provided by the breaker operator and the longest load current open time provided by the breaker supplier. The method comprises a fourth step of numerical calculation and comparison, calculating possible current breaking arc energy and longest load current breaking time according to real-time current numerical values, calculating accumulated breaking energy of the circuit breaker, and comparing the difference with an electric service life threshold value of the circuit breaker to realize dynamic load capacity evaluation of the circuit breaker.

The method integrates the results of the four steps, namely, the judgment of the property of the load current, the real-time data evaluation of the load current of the circuit breaker, the historical accumulated data evaluation of the load current of the circuit breaker and the historical accumulated data evaluation of the current on-off service life of the circuit breaker are realized, and the evaluation results simultaneously reflect the evaluation and analysis of the dynamic load capacity of the circuit breaker, so that the analysis method of the dynamic load capacity of the circuit breaker is integrally formed.

For another example, the method for managing dynamic load capacity of a circuit breaker includes the method for analyzing dynamic load capacity of a circuit breaker according to any of the embodiments, and adjusting the load of the circuit breaker according to an evaluation result of the dynamic load of the circuit breaker. As another example, the load of the circuit breaker is adjusted based on the dynamic load capacity of the circuit breaker. In one embodiment, the method for managing the dynamic load capacity of the circuit breaker comprises the following steps: acquiring a real-time current value and a real-time voltage value; calculating the current phase difference and the voltage phase difference; judging the current property; judging the dynamic load condition of the circuit breaker according to the current property; outputting a dynamic load analysis result of the circuit breaker; adjusting the load of the circuit breaker according to the dynamic load capacity of the circuit breaker; for example, adjusting the load of a circuit breaker according to its dynamic load capacity comprises the following steps: and determining the dynamic load capacity of the circuit breaker according to the analysis result of the dynamic load of the circuit breaker, and adjusting the load of the circuit breaker. In one embodiment, the load of the circuit breaker is adjusted according to the dynamic load capacity of the circuit breaker, specifically: and dynamically adjusting the load of the circuit breaker according to the dynamic load capacity of the circuit breaker. One example is shown in fig. 4, which obtains a real-time current value and a real-time voltage value; calculating the current phase difference and the voltage phase difference; judging the current property; comparing the real-time current value with a real-time current allowable threshold value; comparing the current change trend with a current change allowable threshold value; comparing the allowable threshold value of the service life; outputting a dynamic load analysis result of the circuit breaker; and dynamically adjusting the load of the circuit breaker according to the dynamic load capacity of the circuit breaker. For example, dynamically adjusting the load of a circuit breaker according to the dynamic load capacity of the circuit breaker comprises the following steps: determining the dynamic load capacity of the circuit breaker according to the analysis result of the dynamic load of the circuit breaker, and judging whether the current load exceeds the limit and/or whether the future load exceeds the limit according to the dynamic load capacity of the circuit breaker, wherein if any judgment result is yes, the load of the circuit breaker is dynamically reduced; and meanwhile, judging whether the current load has the increment allowance and/or whether the future load has the increment allowance, and if so, dynamically increasing the load of the breaker. Therefore, after the analysis method of the dynamic load capacity of the circuit breaker, the load of the circuit breaker can be reasonably and dynamically adjusted according to the analysis result, so that the fault rate is favorably reduced, the fault-free running time of the circuit breaker is prolonged, the service life of the circuit breaker is prolonged, and the robustness of a power grid system is improved.

According to the analysis method and the management method, real-time analysis and evaluation are carried out according to the property and the size of the current of the main loop of the circuit breaker, and the margin of various currents borne by the circuit breaker, the load which can be increased and possible faults which can be borne by the circuit breaker are judged, so that basic support is provided for the management of the circuit breaker, the fault rate can be avoided, the fault-free running time of the circuit breaker is prolonged, and the service life of the circuit breaker is prolonged.

It should be noted that other embodiments of the present invention further include an analysis method and a management method of the breaker dynamic load capacity, which are formed by combining technical features in the above embodiments with each other and can be implemented.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The analysis method for the dynamic load capacity of the circuit breaker is characterized by comprising the following steps:

presetting a threshold value: presetting a current allowable threshold, a main loop temperature rise allowable threshold and an electric life allowable arc energy threshold;

a judging step, wherein the judging step comprises a real-time judging step, an accumulation judging step and an electric service life judging step;

wherein, the real-time judging step comprises: calculating a current difference value between the real-time current value and the current allowable threshold value, and judging a dynamic load real-time data evaluation result of the circuit breaker according to the current difference value; measuring or calculating the temperature difference value between the temperature rise value of the main loop and the allowable temperature rise threshold value of the main loop, and judging the real-time data evaluation result of the dynamic load of the circuit breaker according to the temperature difference value;

the accumulation judging step includes: calculating the real-time current change trend, determining the time when the current reaches a current allowable threshold value, and judging the evaluation result of the dynamic load accumulated data of the circuit breaker; calculating the variation trend of the temperature rise value of the main loop, determining the time when the temperature rise of the main loop reaches the allowable threshold value of the temperature rise of the main loop, and judging the evaluation result of the dynamic load accumulated data of the circuit breaker;

obtaining a real-time data evaluation result of the dynamic load of the circuit breaker, an accumulated data evaluation result of the dynamic load of the circuit breaker and a possible electric service life evaluation result of the dynamic load of the circuit breaker by adopting the judging step, and forming and outputting an evaluation result of the dynamic load of the circuit breaker;

the method comprises the following steps of calculating the temperature rise value change trend of a main loop, determining the time when the temperature rise of the main loop reaches a temperature rise allowable threshold value of the main loop, and judging the evaluation result of the dynamic load accumulated data of the circuit breaker, wherein the method comprises the following steps:

judging the evaluation result of the dynamic load accumulated data of the circuit breaker according to the time required for reaching the temperature rise allowable threshold value of the main loop;

and under the condition that the temperature rise allowable threshold value of the main circuit is reached in a short time, judging the time required by the dynamic load of the circuit breaker to reach the temperature rise allowable threshold value of the main circuit as the time allowed to be maintained according to the current trend in the dynamic load evaluation.

2. The method for analyzing dynamic load capacity of a circuit breaker according to claim 1, wherein the current-allowable threshold comprises a resistive current-allowable threshold, a capacitive current-allowable threshold, and an inductive current-allowable threshold;

the threshold value presetting step specifically comprises the following steps:

3. The method for analyzing the dynamic load capacity of the circuit breaker according to claim 1, wherein the step of calculating the current difference between the real-time current value and the current allowable threshold value comprises the following steps:

acquiring a real-time current value and a real-time voltage value;

4. The method for analyzing the dynamic load capacity of the circuit breaker according to claim 1, wherein the step of determining the real-time data evaluation result of the dynamic load of the circuit breaker according to the current difference comprises the following steps:

5. The method for analyzing the dynamic load capacity of the circuit breaker according to claim 1, wherein the step of calculating the temperature difference between the main circuit temperature rise value and the main circuit temperature rise allowable threshold value comprises the following steps:

acquiring a main loop temperature rise value;

6. The method for analyzing the dynamic load capacity of the circuit breaker according to claim 1, wherein the step of determining the real-time data evaluation result of the dynamic load of the circuit breaker according to the temperature difference comprises the following steps:

7. The method for analyzing dynamic load capacity of the circuit breaker according to claim 1, wherein the step of calculating a real-time current variation trend and determining the time when the current reaches the current allowable threshold value to determine the evaluation result of the accumulated data of the dynamic load of the circuit breaker comprises the following steps:

and judging the evaluation result of the dynamic load accumulated data of the circuit breaker according to the time required for reaching the current allowable threshold.

8. The method for analyzing the dynamic load capacity of the circuit breaker according to claim 7, wherein in the case that the current allowable threshold value is reached within a preset short time, the time required for the dynamic load of the circuit breaker to reach the current allowable threshold value is determined as the time allowed for the dynamic load to be maintained according to the current trend.

9. The method for analyzing the dynamic load capacity of the circuit breaker as claimed in claim 7, wherein the real-time current value and the real-time voltage value are real-time current value and real-time voltage value of a main circuit of the circuit breaker.

10. Method for managing the dynamic load capacity of a circuit breaker, characterized in that it comprises a method for analyzing the dynamic load capacity of a circuit breaker according to any one of claims 1 to 9 and adjusting the load of said circuit breaker according to the evaluation result of the dynamic load of the circuit breaker.