Circuit breaker arc extinguishing performance evaluation method and device, electronic equipment and storage medium

Abstract

The invention discloses a circuit breaker arc extinguishing performance evaluation method and device, electronic equipment and a storage medium, and the method comprises the steps: collecting the radiation electromagnetic waves of a to-be-tested circuit breaker in the breaking process, and determining whether a re-breakdown phenomenon occurs or not according to the radiation electromagnetic waves; if yes, detecting an operating mechanism of the circuit breaker, and determining the state of an arc extinguish chamber of the circuit breaker according to the performance state of the operating mechanism of the circuit breaker; and if not, determining the state of an arc extinguish chamber of the circuit breaker, obtaining a dynamic resistance signal of the circuit breaker, determining a contact ablation angle according to the dynamic resistance signal, and determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker. The technical problems that in the prior art, evaluation accuracy is low, and influence factors of the circuit breaker cannot be comprehensively considered are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of power transformation and test measurement, and in particular to a method, device, electronic equipment and storage medium for evaluating the arc extinguishing performance of a circuit breaker. Background Art

[0002] Circuit breakers are the most numerous electrical equipment in the power grid, playing a role of control and protection. Once a fault occurs, it will not only directly lead to power grid accidents, but also lead to the expansion of existing accidents, bringing huge negative impacts on the national economy and social stability. Arc extinguishing performance is the most important performance of circuit breakers, and its main evaluation methods include electrical life method, dynamic resistance method and radiation electromagnetic wave method.

[0003] These methods are generally used independently, and in the evaluation of the arc extinguishing performance of circuit breakers, the nature and size of the interrupted load are not considered in the evaluation basis. This leads to the following deficiencies in the current evaluation of the arc extinguishing performance of circuit breakers: 1) The detection methods have their own advantages and disadvantages. The evaluation based on the detection results of a single method is not accurate enough, but there is still a lack of methods to effectively combine these detection results; 2) The difficulty of interrupting capacitive loads is much greater than that of resistive loads. In the same circuit breaker state, resistive loads with the same current amplitude can be interrupted, but capacitive loads cannot be interrupted. Therefore, in addition to considering the size of the interrupted load, the nature of the interrupted load must also be considered. Summary of the invention

[0004] The present invention provides a method, device, electronic device and storage medium for evaluating the arc extinguishing performance of a circuit breaker, so as to solve the technical problems in the prior art of low evaluation accuracy and failure to fully consider the influencing factors of the circuit breaker.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for evaluating the arc extinguishing performance of a circuit breaker, comprising:

[0006] Collecting the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and determining whether a heavy breakdown phenomenon occurs based on the radiated electromagnetic waves;

[0007] If yes, detecting the circuit breaker operating mechanism, and determining the state of the arc extinguishing chamber of the circuit breaker according to the performance state of the circuit breaker operating mechanism;

[0008] If not, determine the arc extinguishing chamber state of the circuit breaker, obtain the dynamic resistance signal of the circuit breaker, determine the contact erosion angle according to the dynamic resistance signal, and determine the arc extinguishing performance of the circuit breaker according to the contact erosion angle and the load information of the circuit breaker.

[0009] As a preferred solution, the collecting of the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process and determining whether a heavy breakdown phenomenon occurs according to the radiated electromagnetic waves specifically includes:

[0010] The electromagnetic waves radiated by each arc extinguishing chamber of the circuit breaker to be tested during the opening process are collected by means of the detection band antenna and the envelope detection amplifier;

[0011] When the number of electromagnetic wave signals radiated by the circuit breaker is more than or equal to three groups, and the signal interval between every two groups of electromagnetic waves is greater than a preset interval, a heavy breakdown phenomenon occurs in the circuit breaker to be tested;

[0012] When the number of electromagnetic wave signals radiated by the circuit breaker is less than three groups, the circuit breaker to be tested does not have a re-breakdown phenomenon.

[0013] As a preferred solution, the detecting the circuit breaker operating mechanism and determining the arc extinguishing chamber state of the circuit breaker according to the performance state of the circuit breaker operating mechanism specifically includes:

[0014] Detecting the operating mechanism of the circuit breaker to be tested, and collecting the opening and closing time and opening speed of the operating mechanism;

[0015] Determining the performance state of the operating mechanism of the circuit breaker according to the opening and closing time and the opening speed;

[0016] When the performance state of the operating mechanism of the circuit breaker is in a qualified state, determining that the state of the arc extinguishing chamber of the circuit breaker is unqualified;

[0017] When the performance status of the operating mechanism of the circuit breaker is in an unqualified state, an operating mechanism repair signal is generated, so that the user can repair the operating mechanism according to the operating mechanism repair signal.

[0018] As a preferred solution, after the repair signal repairs the operating mechanism, the method further comprises:

[0019] Retest the circuit breaker for a heavy breakdown phenomenon;

[0020] If the heavy breakdown phenomenon still exists, the arc extinguishing chamber is still judged to be unqualified;

[0021] If there is no heavy breakdown phenomenon, the arc extinguishing chamber is judged to be qualified.

[0022] As a preferred solution, the determining the arc extinguishing chamber state of the circuit breaker and obtaining the dynamic resistance signal of the circuit breaker specifically includes:

[0023] When no re-breakdown phenomenon occurs, it is determined that the arc extinguishing chamber of the circuit breaker is in a qualified state;

[0024] Based on the arc extinguishing chamber state of the circuit breaker in the qualified state, applying a constant direct current to the circuit breaker so that the circuit breaker is in a closed state;

[0025] Opening a circuit breaker in a closed state, thereby measuring the voltage across the circuit breaker;

[0026] The dynamic resistance of the circuit breaker is calculated according to the voltages at both ends, thereby obtaining a dynamic resistance signal of the circuit breaker.

[0027] As a preferred solution, determining the contact ablation angle according to the dynamic resistance signal, and determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker specifically includes:

[0028] According to the dynamic resistance signal, a change curve of the dynamic resistance signal is obtained;

[0029] Determine the contact ablation angle according to the change curve, and obtain the current load information of the circuit breaker;

[0030] Based on a preset arc extinguishing chamber state spectrum, the arc extinguishing performance of the circuit breaker is determined according to the contact ablation angle and the load information of the circuit breaker.

[0031] As a preferred solution, determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker specifically includes:

[0032] When the contact ablation angle and the load information are both in the first preset area, the arc extinguishing performance of the circuit breaker is good;

[0033] When the contact ablation angle and the load information are both in the second preset area, the arc extinguishing performance of the circuit breaker is good;

[0034] When the contact ablation angle and the load information are both in the third preset area, the arc extinguishing performance of the circuit breaker is average;

[0035] When the contact ablation angle and the load information are both in the fourth preset area, the arc extinguishing performance of the circuit breaker is poor;

[0036] When the contact ablation angle and the load information are not in the first preset area, the second preset area, the third preset area, the fourth preset area and the fifth preset area, the arc extinguishing performance of the circuit breaker is unqualified;

[0037] The arc extinguishing performance levels of the circuit breaker include: good, better, average and unqualified.

[0038] Accordingly, the present invention also provides a circuit breaker arc extinguishing performance evaluation device, comprising: a collection module, a first execution module and a second execution module;

[0039] The acquisition module is used to collect the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and determine whether a re-breakdown phenomenon occurs based on the radiated electromagnetic waves;

[0040] The first execution module is used to detect the circuit breaker operating mechanism if a heavy breakdown phenomenon occurs, and determine the state of the arc extinguishing chamber of the circuit breaker according to the performance state of the circuit breaker operating mechanism;

[0041] The second execution module is used to determine the arc extinguishing chamber state of the circuit breaker if no re-breakdown phenomenon occurs, and obtain the dynamic resistance signal of the circuit breaker, determine the contact erosion angle according to the dynamic resistance signal, and determine the arc extinguishing performance of the circuit breaker according to the contact erosion angle and the load information of the circuit breaker.

[0042] Correspondingly, the present invention also provides a terminal device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, it implements the method for evaluating the arc extinguishing performance of a circuit breaker as described in any one of the above items.

[0043] Correspondingly, the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the method for evaluating the arc extinguishing performance of a circuit breaker as described in any one of the above.

[0044] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0045] The technical solution of the present invention collects the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and then determines the corresponding heavy breakdown phenomenon. When the heavy breakdown phenomenon occurs, the circuit breaker operating mechanism is detected, and the arc extinguishing chamber state of the circuit breaker is determined according to the performance state of the circuit breaker operating mechanism. When the heavy breakdown phenomenon does not occur, the arc extinguishing chamber state of the circuit breaker is determined, and the dynamic resistance signal of the circuit breaker is obtained to determine the contact ablation angle and load information, and finally determine the arc extinguishing performance of the circuit breaker. Considering the breaking load information can improve the accuracy of the state level of the arc extinguishing performance evaluation of the circuit breaker, avoid the situation where the error is large when evaluating based on the detection results of a single method, and effectively avoid blind power outage detection. At the same time, the evaluation is more accurate, and the evaluated arc extinguishing performance results are more in line with the working scenario of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 : A flow chart of the steps of a method for evaluating the arc extinguishing performance of a circuit breaker provided by an embodiment of the present invention;

[0047] Figure 2: A schematic diagram of circuit breaker state determination based on arc contact erosion angle and breaking load properties provided by an embodiment of the present invention;

[0048] Figure 3 : A flowchart of a method for evaluating arc extinguishing performance of a circuit breaker provided by an embodiment of the present invention;

[0049] Figure 4 : A structural diagram of a circuit breaker arc extinguishing performance evaluation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Embodiment 1

[0052] Please refer to Figure 1 , a method for evaluating arc extinguishing performance of a circuit breaker provided by an embodiment of the present invention, comprising the following steps S101-S103:

[0053] Step S101: collecting the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and determining whether a re-breakdown phenomenon occurs based on the radiated electromagnetic waves.

[0054] As a preferred solution of this embodiment, the collecting of the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process and determining whether a heavy breakdown phenomenon occurs according to the radiated electromagnetic waves specifically includes:

[0055] The radiated electromagnetic waves radiated by each arc extinguishing chamber of the circuit breaker to be tested during the starting process are collected by detecting the frequency band antenna and the envelope detection amplifier; when the radiated electromagnetic wave signals radiated by the circuit breaker are more than or equal to three groups, and the signal interval time between every two groups of radiated electromagnetic waves is greater than the preset interval, the circuit breaker to be tested has a heavy breakdown phenomenon; when the radiated electromagnetic wave signals radiated by the circuit breaker are less than three groups, the circuit breaker to be tested has not experienced a heavy breakdown phenomenon.

[0056] In this embodiment, by measuring the radiated electromagnetic waves during the circuit breaker opening process, an antenna with a detection frequency band of 500MHz-2GHz is used in conjunction with an amplifier with an envelope detection function for detection. Generally, the amplifier gain is above 20dB and the detection time is 100μs-200μs, so as to determine whether the circuit breaker has a heavy breakdown phenomenon.

[0057] In this embodiment, each arc extinguishing chamber of a general circuit breaker radiates only one group of electromagnetic wave signals during the breaking process, and the circuit breaker is connected to a three-phase voltage signal, then there are three groups of electromagnetic wave signals. If the number of radiated electromagnetic wave signals is greater than or equal to three groups, and the interval time between two groups of radiated electromagnetic wave signals is greater than 10ms, then it is considered that the circuit breaker has a heavy breakdown phenomenon; otherwise, the circuit breaker has not experienced a heavy breakdown phenomenon.

[0058] Step S102: If a heavy breakdown occurs, the circuit breaker operating mechanism is detected, and the arc extinguishing chamber state of the circuit breaker is determined according to the performance state of the circuit breaker operating mechanism.

[0059] As a preferred solution of this embodiment, the detecting the circuit breaker operating mechanism and determining the arc extinguishing chamber state of the circuit breaker according to the performance state of the circuit breaker operating mechanism specifically includes:

[0060] Detecting the operating mechanism of the circuit breaker to be tested, and collecting the opening and closing time and the opening speed of the operating mechanism; determining the performance status of the operating mechanism of the circuit breaker according to the opening and closing time and the opening speed; when the performance status of the operating mechanism of the circuit breaker is in a qualified state, determining the arc extinguishing chamber state of the circuit breaker to be unqualified; when the performance status of the operating mechanism of the circuit breaker is in an unqualified state, generating an operating mechanism repair signal, so that the user can repair the operating mechanism according to the operating mechanism repair signal.

[0061] In this embodiment, if the circuit breaker finds a heavy breakdown phenomenon, the performance of the operating mechanism is detected to be qualified. If the operating mechanism is qualified, the arc extinguishing chamber state is directly determined to be unqualified, and the arc extinguishing performance of the circuit breaker is evaluated as unqualified. It should be noted that the performance state of the operating mechanism of the circuit breaker can be determined by collecting the mechanical characteristics of the operating mechanism and the opening and closing time, the opening speed, and the time of different periods, and then combining the corresponding values ​​and standard measurement methods specified in specific industry standards to determine the performance state of the operating mechanism of the circuit breaker, and finally determine the arc extinguishing chamber state of the circuit breaker.

[0062] In this embodiment, the performance of the operating mechanism can be detected by measuring the insulation resistance, measuring the resistance of each phase conductive circuit, AC withstand voltage test, measuring the opening and closing time of the circuit breaker, measuring the opening and closing speed of the circuit breaker, measuring the input time and resistance value of the circuit breaker closing resistance, measuring the insulation resistance and DC resistance of the circuit breaker opening and closing coil, testing the circuit breaker operating mechanism, measuring the water content of SF6 gas in the circuit breaker, sealing test and inspection of the gas density relay, pressure gauge and pressure-operated valve, thereby providing a comprehensive test for the performance of the circuit breaker operating mechanism based on the detected data.

[0063] As a preferred solution of this embodiment, after the repair signal repairs the operating mechanism, the method further includes:

[0064] The circuit breaker is retested for the heavy breakdown phenomenon; if the heavy breakdown phenomenon still exists, the arc extinguishing chamber state is still determined to be unqualified; if the heavy breakdown phenomenon does not exist, the arc extinguishing chamber state is determined to be qualified.

[0065] In this embodiment, if the operating mechanism is found to be unqualified, the operating mechanism is repaired and tested again. If the re-test still finds a heavy breakdown phenomenon, the arc extinguishing chamber state is still determined to be unqualified, and the circuit breaker arc extinguishing performance is evaluated as unqualified. If there is no heavy breakdown phenomenon, the arc extinguishing chamber state is determined to be qualified.

[0066] Step S103: If there is no re-breakdown phenomenon, determine the arc extinguishing chamber state of the circuit breaker, obtain the dynamic resistance signal of the circuit breaker, determine the contact erosion angle according to the dynamic resistance signal, and determine the arc extinguishing performance of the circuit breaker according to the contact erosion angle and the load information of the circuit breaker.

[0067] As a preferred solution of this embodiment, determining the arc extinguishing chamber state of the circuit breaker and obtaining the dynamic resistance signal of the circuit breaker specifically includes:

[0068] When no re-breakdown phenomenon occurs, it is determined that the arc extinguishing chamber state of the circuit breaker is qualified; based on the arc extinguishing chamber state of the circuit breaker in a qualified state, a constant DC current is applied to the circuit breaker to make the circuit breaker in a closed state; the circuit breaker in the closed state is opened to measure the voltage across the circuit breaker; the dynamic resistance of the circuit breaker is calculated according to the voltage across the two ends, thereby obtaining the dynamic resistance signal of the circuit breaker.

[0069] In this embodiment, if no re-breakdown phenomenon is found by radiating electromagnetic waves, it is considered that the arc extinguishing chamber is in good condition, and a refined evaluation of the arc extinguishing chamber state level is performed based on the dynamic resistance method and the type and size of the load. The state level is determined by comparing the preset arc extinguishing chamber state spectrum, and the final arc extinguishing performance level is given. Preferably, the preset arc extinguishing chamber state spectrum is as follows: Figure 2 shown.

[0070] As a preferred solution of this embodiment, determining the contact ablation angle according to the dynamic resistance signal, and determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker specifically includes:

[0071] According to the dynamic resistance signal, a change curve of the dynamic resistance signal is obtained; according to the change curve, the contact erosion angle is determined, and the current load information of the circuit breaker is obtained; based on a preset arc extinguishing chamber state spectrum, the arc extinguishing performance of the circuit breaker is determined according to the contact erosion angle and the load information of the circuit breaker.

[0072] In this embodiment, the dynamic resistance method measurement can first ensure that the circuit breaker is disconnected from the system, so that the circuit breaker is in an offline and unpowered state, and apply a constant DC current I to the circuit breaker, generally not less than 100A, so that the circuit breaker is in a closed state, and then the circuit breaker is opened. During this period, the voltage V across the circuit breaker is measured, and the dynamic resistance R=V / I is calculated by Ohm's law. That is, the dynamic resistance of the circuit breaker can be calculated by the measured voltage and the applied current value, and then the ablation angle of the contact can be obtained according to the change curve of the dynamic resistance.

[0073] As a preferred solution of this embodiment, determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker specifically includes:

[0074] When the contact erosion angle and the load information are both in the first preset area, the arc extinguishing performance of the circuit breaker is good; when the contact erosion angle and the load information are both in the second preset area, the arc extinguishing performance of the circuit breaker is better; when the contact erosion angle and the load information are both in the third preset area, the arc extinguishing performance of the circuit breaker is general; when the contact erosion angle and the load information are both in the fourth preset area, the arc extinguishing performance of the circuit breaker is poor; when the contact erosion angle and the load information are not in the first preset area, the second preset area, the third preset area, the fourth preset area and the fifth preset area, the arc extinguishing performance of the circuit breaker is unqualified; wherein, the arc extinguishing performance levels of the circuit breaker include: good, better, general and unqualified.

[0075] In this embodiment, the circuit breaker state is determined by presetting the arc extinguishing chamber state spectrum and combining the arc contact erosion angle and the breaking load property, wherein: Figure 2 The load in the preset arc extinguishing chamber state spectrum shown is a capacitive load, and the resistive load can be executed for reference. Preferably, the state level is determined by comparing the preset arc extinguishing chamber state spectrum to give the final arc extinguishing performance level. For example, when the contact ablation angle is 60°, when the load is 0.5μF, the arc extinguishing performance evaluation level is general, when the load is 1.0μF, the arc extinguishing performance evaluation level is poor, and when the load is 2.0μF, the arc extinguishing performance evaluation level is unqualified.

[0076] In this example, see Figure 3First, the radiation electromagnetic wave method that can be detected with power is used for detection. When abnormal phenomena such as heavy breakdown are found, the circuit breaker operating mechanism is tested to see if it is qualified. If the operating mechanism is qualified, the arc extinguishing chamber state is directly judged to be unqualified, and the circuit breaker arc extinguishing performance is evaluated as unqualified. If the operating mechanism performance is found to be unqualified, the operating mechanism is repaired and tested again. If the radiation electromagnetic wave does not find heavy breakdown, the arc extinguishing chamber state is considered to be qualified, and the arc extinguishing chamber state level is refined based on the dynamic resistance method and the type and size of the load. The state level is determined by comparing the arc extinguishing chamber state spectrum, and the final arc extinguishing performance level is given.

[0077] It is understandable that this embodiment first uses the radiation electromagnetic wave method that can be detected with power on for detection. When abnormal phenomena such as heavy breakdown are found, the evaluation results are directly given, and the evaluation is fast and convenient. For circuit breakers that require refined evaluation, when the radiation electromagnetic wave method does not find the heavy breakdown phenomenon, the offline dynamic resistance method can be used and combined with the load type and size for accurate evaluation, effectively avoiding blind power outage detection. At the same time, the type and size of the load are fully considered in the evaluation, the evaluation is more accurate, and the evaluation results are more in line with the working scenario of the circuit breaker.

[0078] Implementing the above embodiments has the following effects:

[0079] The technical solution of the present invention collects the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and then determines the corresponding heavy breakdown phenomenon. When the heavy breakdown phenomenon occurs, the circuit breaker operating mechanism is detected, and the arc extinguishing chamber state of the circuit breaker is determined according to the performance state of the circuit breaker operating mechanism. When the heavy breakdown phenomenon does not occur, the arc extinguishing chamber state of the circuit breaker is determined, and the dynamic resistance signal of the circuit breaker is obtained to determine the contact ablation angle and load information, and finally determine the arc extinguishing performance of the circuit breaker. Considering the breaking load information can improve the accuracy of the state level of the arc extinguishing performance evaluation of the circuit breaker, avoid the situation where the error is large when evaluating based on the detection results of a single method, and effectively avoid blind power outage detection. At the same time, the evaluation is more accurate, and the evaluated arc extinguishing performance results are more in line with the working scenario of the circuit breaker.

[0080] Embodiment 2

[0081] See also Figure 2 , which is an evaluation device for the arc extinguishing performance of a circuit breaker provided by the present invention, comprising: a collection module 201, a first execution module 202 and a second execution module 203.

[0082] The acquisition module 201 is used to acquire the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and determine whether a re-breakdown phenomenon occurs based on the radiated electromagnetic waves.

[0083] The first execution module 202 is used to detect the circuit breaker operating mechanism if a heavy breakdown phenomenon occurs, and determine the state of the arc extinguishing chamber of the circuit breaker according to the performance state of the circuit breaker operating mechanism.

[0084] The second execution module 203 is used to determine the arc extinguishing chamber state of the circuit breaker if no re-breakdown phenomenon occurs, and obtain the dynamic resistance signal of the circuit breaker, determine the contact erosion angle according to the dynamic resistance signal, and determine the arc extinguishing performance of the circuit breaker according to the contact erosion angle and the load information of the circuit breaker.

[0085] As a preferred solution, the collecting of the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process and determining whether a heavy breakdown phenomenon occurs according to the radiated electromagnetic waves specifically includes:

[0086] The electromagnetic waves radiated by each arc extinguishing chamber of the circuit breaker to be tested during the opening process are collected by means of the detection band antenna and the envelope detection amplifier;

[0087] When the number of electromagnetic wave signals radiated by the circuit breaker is more than or equal to three groups, and the signal interval between every two groups of electromagnetic waves is greater than a preset interval, a heavy breakdown phenomenon occurs in the circuit breaker to be tested;

[0088] When the number of electromagnetic wave signals radiated by the circuit breaker is less than three groups, the circuit breaker to be tested does not have a re-breakdown phenomenon.

[0089] As a preferred solution, the detecting the circuit breaker operating mechanism and determining the arc extinguishing chamber state of the circuit breaker according to the performance state of the circuit breaker operating mechanism specifically includes:

[0090] Detecting the operating mechanism of the circuit breaker to be tested, and collecting the opening and closing time and opening speed of the operating mechanism;

[0091] Determining the performance state of the operating mechanism of the circuit breaker according to the opening and closing time and the opening speed;

[0092] When the performance state of the operating mechanism of the circuit breaker is in a qualified state, determining that the state of the arc extinguishing chamber of the circuit breaker is unqualified;

[0093] When the performance status of the operating mechanism of the circuit breaker is in an unqualified state, an operating mechanism repair signal is generated, so that the user can repair the operating mechanism according to the operating mechanism repair signal.

[0094] As a preferred solution, after the repair signal repairs the operating mechanism, the method further comprises:

[0095] Retest the circuit breaker for a heavy breakdown phenomenon;

[0096] If the heavy breakdown phenomenon still exists, the arc extinguishing chamber is still judged to be unqualified;

[0097] If there is no heavy breakdown phenomenon, the arc extinguishing chamber is judged to be qualified.

[0098] As a preferred solution, the determining the arc extinguishing chamber state of the circuit breaker and obtaining the dynamic resistance signal of the circuit breaker specifically includes:

[0099] When no re-breakdown phenomenon occurs, it is determined that the arc extinguishing chamber of the circuit breaker is in a qualified state;

[0100] Based on the arc extinguishing chamber state of the circuit breaker in the qualified state, applying a constant direct current to the circuit breaker so that the circuit breaker is in a closed state;

[0101] Opening a circuit breaker in a closed state, thereby measuring the voltage across the circuit breaker;

[0102] The dynamic resistance of the circuit breaker is calculated according to the voltages at both ends, thereby obtaining a dynamic resistance signal of the circuit breaker.

[0103] As a preferred solution, determining the contact ablation angle according to the dynamic resistance signal, and determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker specifically includes:

[0104] According to the dynamic resistance signal, a change curve of the dynamic resistance signal is obtained;

[0105] Determine the contact ablation angle according to the change curve, and obtain the current load information of the circuit breaker;

[0106] Based on a preset arc extinguishing chamber state spectrum, the arc extinguishing performance of the circuit breaker is determined according to the contact ablation angle and the load information of the circuit breaker.

[0107] As a preferred solution, determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker specifically includes:

[0108] When the contact ablation angle and the load information are both in the first preset area, the arc extinguishing performance of the circuit breaker is good;

[0109] When the contact ablation angle and the load information are both in the second preset area, the arc extinguishing performance of the circuit breaker is good;

[0110] When the contact ablation angle and the load information are both in the third preset area, the arc extinguishing performance of the circuit breaker is average;

[0111] When the contact ablation angle and the load information are both in the fourth preset area, the arc extinguishing performance of the circuit breaker is poor;

[0112] When the contact ablation angle and the load information are not in the first preset area, the second preset area, the third preset area, the fourth preset area and the fifth preset area, the arc extinguishing performance of the circuit breaker is unqualified;

[0113] The arc extinguishing performance levels of the circuit breaker include: good, better, average and unqualified.

[0114] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0115] Implementing the above embodiments has the following effects:

[0116] The technical solution of the present invention collects the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and then determines the corresponding heavy breakdown phenomenon. When the heavy breakdown phenomenon occurs, the circuit breaker operating mechanism is detected, and the arc extinguishing chamber state of the circuit breaker is determined according to the performance state of the circuit breaker operating mechanism. When the heavy breakdown phenomenon does not occur, the arc extinguishing chamber state of the circuit breaker is determined, and the dynamic resistance signal of the circuit breaker is obtained to determine the contact ablation angle and load information, and finally determine the arc extinguishing performance of the circuit breaker. Considering the breaking load information can improve the accuracy of the state level of the arc extinguishing performance evaluation of the circuit breaker, avoid the situation where the error is large when evaluating based on the detection results of a single method, and effectively avoid blind power outage detection. At the same time, the evaluation is more accurate, and the evaluated arc extinguishing performance results are more in line with the working scenario of the circuit breaker.

[0117] Embodiment 3

[0118] Correspondingly, the present invention also provides a terminal device, comprising: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, it implements the method for evaluating the arc extinguishing performance of a circuit breaker as described in any one of the above embodiments.

[0119] The terminal device of this embodiment includes: a processor, a memory, and a computer program and a computer instruction stored in the memory and executable on the processor. When the processor executes the computer program, each step in the above-mentioned embodiment 1 is implemented, for example: Figure 1 Alternatively, when the processor executes the computer program, the functions of each module / unit in the above device embodiment, such as the acquisition module 201, are implemented.

[0120] Exemplarily, the computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device. For example, the acquisition module 201 is used to acquire the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and determine whether a re-breakdown phenomenon occurs based on the radiated electromagnetic waves.

[0121] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the schematic diagram is merely an example of a terminal device and does not constitute a limitation on the terminal device. The terminal device may include more or fewer components than shown in the diagram, or may combine certain components, or different components. For example, the terminal device may also include an input / output device, a network access device, a bus, etc.

[0122] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, and uses various interfaces and lines to connect various parts of the entire terminal device.

[0123] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the terminal device by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile terminal, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0124] Wherein, if the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0125] Embodiment 4

[0126] Correspondingly, the present invention also provides a computer-readable storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute the method for evaluating the arc extinguishing performance of a circuit breaker as described in any one of the above embodiments.

[0127] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for evaluating arc extinguishing performance of a circuit breaker, characterized in that: include: Collecting the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and determining whether a heavy breakdown phenomenon occurs based on the radiated electromagnetic waves; If yes, detecting the circuit breaker operating mechanism, and determining the state of the arc extinguishing chamber of the circuit breaker according to the performance state of the circuit breaker operating mechanism; If not, determine the arc extinguishing chamber state of the circuit breaker, obtain the dynamic resistance signal of the circuit breaker, determine the contact erosion angle according to the dynamic resistance signal, and determine the arc extinguishing performance of the circuit breaker according to the contact erosion angle and the load information of the circuit breaker.

2. A method for evaluating arc extinguishing performance of a circuit breaker according to claim 1, characterized in that: The collecting of the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process and determining whether a heavy breakdown phenomenon occurs according to the radiated electromagnetic waves specifically includes: The electromagnetic waves radiated by each arc extinguishing chamber of the circuit breaker to be tested during the opening process are collected by means of the detection band antenna and the envelope detection amplifier; When the number of electromagnetic wave signals radiated by the circuit breaker is more than or equal to three groups, and the signal interval between every two groups of electromagnetic waves is greater than a preset interval, a heavy breakdown phenomenon occurs in the circuit breaker to be tested; When the number of electromagnetic wave signals radiated by the circuit breaker is less than three groups, the circuit breaker to be tested does not have a re-breakdown phenomenon.

3. A method for evaluating arc extinguishing performance of a circuit breaker according to claim 2, characterized in that: The detecting the circuit breaker operating mechanism and determining the arc extinguishing chamber state of the circuit breaker according to the performance state of the circuit breaker operating mechanism specifically includes: Detecting the operating mechanism of the circuit breaker to be tested, and collecting the opening and closing time and opening speed of the operating mechanism; Determining the performance state of the operating mechanism of the circuit breaker according to the opening and closing time and the opening speed; When the performance state of the operating mechanism of the circuit breaker is in a qualified state, determining that the state of the arc extinguishing chamber of the circuit breaker is unqualified; When the performance status of the operating mechanism of the circuit breaker is in an unqualified state, an operating mechanism repair signal is generated, so that the user can repair the operating mechanism according to the operating mechanism repair signal.

4. A method for evaluating arc extinguishing performance of a circuit breaker according to claim 3, characterized in that: After the repair signal repairs the operating mechanism, the method further comprises: Retest the circuit breaker for a heavy breakdown phenomenon; If the heavy breakdown phenomenon still exists, the arc extinguishing chamber is still judged to be unqualified; If there is no heavy breakdown phenomenon, the arc extinguishing chamber is judged to be qualified.

5. A method for evaluating arc extinguishing performance of a circuit breaker according to claim 1, characterized in that: Determining the arc extinguishing chamber state of the circuit breaker and acquiring the dynamic resistance signal of the circuit breaker specifically includes: When no re-breakdown phenomenon occurs, it is determined that the arc extinguishing chamber of the circuit breaker is in a qualified state; Based on the arc extinguishing chamber state of the circuit breaker in the qualified state, applying a constant direct current to the circuit breaker so that the circuit breaker is in a closed state; Opening a circuit breaker in a closed state, thereby measuring the voltage across the circuit breaker; The dynamic resistance of the circuit breaker is calculated according to the voltages at both ends, thereby obtaining a dynamic resistance signal of the circuit breaker.

6. A method for evaluating arc extinguishing performance of a circuit breaker according to claim 5, characterized in that: Determining the contact ablation angle according to the dynamic resistance signal, and determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker, specifically includes: According to the dynamic resistance signal, a change curve of the dynamic resistance signal is obtained; Determine the contact ablation angle according to the change curve, and obtain the current load information of the circuit breaker; Based on a preset arc extinguishing chamber state spectrum, the arc extinguishing performance of the circuit breaker is determined according to the contact ablation angle and the load information of the circuit breaker.

7. A method for evaluating arc extinguishing performance of a circuit breaker according to claim 6, characterized in that: Determining the arc extinguishing performance of the circuit breaker according to the contact ablation angle and the load information of the circuit breaker specifically includes: When the contact ablation angle and the load information are both in the first preset area, the arc extinguishing performance of the circuit breaker is good; When the contact ablation angle and the load information are both in the second preset area, the arc extinguishing performance of the circuit breaker is good; When the contact ablation angle and the load information are both in the third preset area, the arc extinguishing performance of the circuit breaker is average; When the contact ablation angle and the load information are both in the fourth preset area, the arc extinguishing performance of the circuit breaker is poor; When the contact ablation angle and the load information are not in the first preset area, the second preset area, the third preset area, the fourth preset area and the fifth preset area, the arc extinguishing performance of the circuit breaker is unqualified; The arc extinguishing performance levels of the circuit breaker include: good, better, average and unqualified.

8. A device for evaluating the arc extinguishing performance of a circuit breaker, characterized in that: include: A collection module, a first execution module and a second execution module; The acquisition module is used to collect the radiated electromagnetic waves of the circuit breaker to be tested during the breaking process, and determine whether a re-breakdown phenomenon occurs based on the radiated electromagnetic waves; The first execution module is used to detect the circuit breaker operating mechanism if a heavy breakdown phenomenon occurs, and determine the state of the arc extinguishing chamber of the circuit breaker according to the performance state of the circuit breaker operating mechanism; The second execution module is used to determine the arc extinguishing chamber state of the circuit breaker if no re-breakdown phenomenon occurs, and obtain the dynamic resistance signal of the circuit breaker, determine the contact erosion angle according to the dynamic resistance signal, and determine the arc extinguishing performance of the circuit breaker according to the contact erosion angle and the load information of the circuit breaker.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, the method for evaluating the arc extinguishing performance of a circuit breaker according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for evaluating the arc extinguishing performance of a circuit breaker according to any one of claims 1 to 7.

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