A method for locating electrical faults

Abstract

The present application relates to a method for locating an electrical fault, and belongs to the technical field of digital fault locating, wherein the method comprises: obtaining current pulse data generated by the discharge of the electrical appliance corona electrode; obtaining first characteristic data to be measured of the current pulse data, and judging whether the corona electrode has a fracture fault and a breakdown discharge fault according to the difference between the first characteristic data to be measured and the preset reference first characteristic data when the corona electrode is normal; when the corona electrode has a fracture fault or a breakdown discharge fault, calculating and obtaining second characteristic data to be measured of the current pulse data, and determining the position of the corona electrode fault point according to the second characteristic data to be measured. The present application judges whether the electrical appliance corona electrode has a fracture fault or a breakdown discharge fault through the first characteristic data of the current pulse data, and further locates the position of the corona electrode fault through the second characteristic data, thereby locating the fracture fault and the breakdown discharge fault of the electrical appliance corona electrode.

Description

Technical Field

[0001] The present application relates to the technical field of digital fault location, and in particular to a method for locating an electrical fault. Background Art

[0002] Tar collector is a large-scale heavy asset equipment that uses the principle that tar and other pollutant particles move toward the precipitation electrode and accumulate and fall to achieve atmospheric purification. It is a key equipment for the development of basic industries such as coking and coal. Since the gas with impurities enters the tar collector from the bottom in the form of airflow, the power of the airflow will cause the corona electrode with a charged spike structure that generates electrons to swing to a certain extent, which will cause a high voltage short circuit between the electric spike with negative DC charge and the grounded metal precipitation electrode next to it, resulting in explosions and major accidents that endanger personal safety.

[0003] In order to prevent the occurrence of such faults, technologies to prevent corona electrode swaying have emerged. For example, Chinese invention patent with application number CN202111472988.8 discloses an electric tar collector equipped with a corona electrode anti-sway structure, and Chinese utility model patent with application number CN201420113795.2 discloses a corona electrode anti-sway suspension. Both methods of preventing the corona electrode of a charged thorn structure from swaying are proposed. At present, the method of preventing the corona electrode of a charged thorn structure from swaying is generally to mount an object with a certain weight under the corona electrode, and reduce the amplitude of the corona electrode swaying by gravity traction; however, this method also brings new problems: The risk of corona electrodes with a length of more than ten meters increases significantly. Since there are only a dozen corona electrodes in a giant tar collector, the failure of a single corona electrode to open and close will lead to a significant reduction in the working efficiency of the tar collector, resulting in a strong demand for accurate positioning of the corona electrode virtual break fault point on site. In addition, due to the limited tensile strength of the corona electrode, it is impossible to load heavy objects under the corona electrode, resulting in the inability of existing corona electrode anti-sway technology to completely eliminate the swaying of the corona electrode. During on-site operation, the corona electrode equipped with an anti-sway device will still produce a breakdown discharge fault with the metal precipitation electrode. How to effectively locate the breakdown discharge fault is also one of the goals that need to be achieved on site.

[0004] However, in the existing technology, it is difficult to locate the corona electrode rupture failure and breakdown discharge failure, whether on-site or in related papers, patents and other documents, resulting in frequent production suspension incidents in local tar, coal, thermal power plants and other industries under strict targets. Summary of the invention

[0005] In view of this, it is necessary to provide an electrical fault locating method to solve the problem that it is difficult to locate the corona electrode body fracture fault and the breakdown discharge fault in the prior art.

[0006] In order to solve the above problems, the present application provides a method for locating an electrical fault, comprising:

[0007] Obtain current pulse data generated by electrical appliance corona discharge;

[0008] Acquire the first characteristic data to be measured of the current pulse data, and judge whether the corona electrode has a fracture fault and a breakdown discharge fault according to the difference between the first characteristic data to be measured and the preset reference first characteristic data when the corona electrode is normal;

[0009] When the corona electrode has a fracture fault or a breakdown discharge fault, the second characteristic data to be measured of the current pulse data is calculated and obtained, and the position of the corona electrode fault point is determined according to the second characteristic data to be measured.

[0010] In some possible implementations, the current pulse data is acquired by a data sensing module and a data acquisition and processing module, wherein the data acquisition and processing module includes a denoising unit, an amplification unit, and an acquisition unit;

[0011] The data sensing module is used to obtain the current pulse signal generated by the electric spike discharge on the corona electrode through the sensor;

[0012] The denoising unit is used to denoise the current pulse signal, the amplifying unit is used to amplify the current pulse signal, and the collecting unit is used to collect the denoised and amplified signal to obtain current pulse data.

[0013] In some possible implementations, the sensor is a high-frequency current sensor, and the sensor is disposed on a grounding wire of a precipitation electrode of an electrical appliance, and each precipitation electrode grounding wire corresponds to a sensor.

[0014] In some possible implementations, the sum of the superposition of the energy spectrum of the current pulse signal generated by the corona electrode breakdown discharge fault and the energy spectrum distribution range of the corona electrode normal discharge current pulse signal is the superimposed energy spectrum, the denoising unit uses a filter for denoising, the bandwidth of the filter is not less than the superimposed energy spectrum, the amplification factor of the amplification unit satisfies the amplification factor of not less than the preset frequency in the superimposed energy spectrum, and the real-time sampling rate of the acquisition unit is greater than the preset multiple of the maximum frequency point within the frequency band of the superimposed energy spectrum.

[0015] In some possible implementations, the first characteristic data includes at least one of an amplitude and an energy spectrum.

[0016] In some possible implementations, when there is a fracture fault in the corona electrode, the second characteristic data to be measured is an energy value to be measured;

[0017] The method comprises: determining the position of the corona electrode fault point according to the second characteristic data to be measured, comprising: calculating and obtaining the length from the breaking point of the fracture fault to the bottom of the corona electrode according to the ratio of the energy value to be measured to the reference energy value of the current pulse data when the corona electrode is normally discharged, so as to determine the position of the corona electrode fault point.

[0018] In some possible implementations, the current pulse data is acquired by a sensor;

[0019] When there is a breakdown discharge fault in the corona electrode, the second characteristic data to be measured is the time to be measured when the current pulse signal reaches the sensor;

[0020] The position of the corona electrode fault point is determined according to the second characteristic data to be measured, including: calculating and obtaining the position of the breakdown discharge fault point according to the ratio of the measured time to the measured time of the current pulse signal generated by the breakdown discharge at the preset corona electrode top to reach the sensor.

[0021] In some possible implementations, the method further includes: when a corona electrode has a rupture fault or a breakdown discharge fault, obtaining the third characteristic data to be measured of the current pulse data, determining the severity of the fault according to the third characteristic data, and based on the severity of the fault and its corresponding early warning mode.

[0022] In some possible implementations, when a corona electrode has a fracture fault, the third characteristic data is the length of a single corona electrode fracture; when a corona electrode has a breakdown discharge fault, the third characteristic data is the frequency of breakdown discharge of a single corona electrode.

[0023] In some possible implementations, the fault severity includes minor faults, general faults, and major faults. When the fault severity is minor faults and general faults, the warning mode is determined to be local warning. When the fault severity is a major fault, the warning mode is determined to be a combination of local and remote warnings.

[0024] The beneficial effect of the present application is that the electrical fault locating method provided by the present application determines whether the electrical appliance corona electrode has a fracture fault or a breakdown discharge fault through the first characteristic data of the acquired current pulse data, and then further locates the location of the corona electrode fault through the second characteristic data, thereby realizing the positioning of the electrical appliance corona electrode fracture fault and the breakdown discharge fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of an embodiment of a method for locating an electrical fault provided by the present application;

[0026] Figure 2 This is a structural diagram of the data sensing module and data acquisition and processing module proposed in this application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] It should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowcharts may be implemented out of order, and steps without logical contextual relationships may be reversed in order or implemented simultaneously. In addition, those skilled in the art may add one or more other operations to the flowcharts, or may remove one or more operations from the flowcharts, under the guidance of the content of this application. Some of the block diagrams shown in the accompanying drawings are functional entities, and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor systems and / or microcontroller systems.

[0029] The descriptions of "first", "second", etc. involved in the embodiments of the present application are only used to describe the implicit purpose, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined as "first" and "second" may explicitly or implicitly include at least one of the features. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist, for example: A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] The present application provides a method for locating an electrical fault, which is described below.

[0032] Figure 1 A schematic diagram of an embodiment of the method for locating an electrical fault provided in this application is shown in FIG. Figure 1 As shown, the electrical fault location method includes:

[0033] S101, obtaining current pulse data generated by corona discharge of an electrical appliance;

[0034] It should be noted that the electrical appliance may be a tar collector, or an electrostatic precipitator, an air purifier or other electrical appliance with a corona electrode.

[0035] S102, obtaining the first characteristic data to be measured of the current pulse data, and judging whether the corona catching electrode has a fracture fault and a breakdown discharge fault according to the difference between the first characteristic data to be measured and the reference first characteristic data when the preset corona electrode is normal;

[0036] It should be noted that fracture faults include virtual fractures.

[0037] S103, when there is a fracture fault or a breakdown discharge fault in the corona electrode, calculating and obtaining the second characteristic data to be measured of the current pulse data, and determining the position of the corona electrode fault point according to the second characteristic data to be measured.

[0038] Compared with the prior art, the present application first determines whether the electrical appliance corona electrode has a fracture fault or a breakdown discharge fault through the first characteristic data of the current pulse data, and then further locates the location of the corona electrode fault through the second characteristic data, thereby locating the electrical appliance corona electrode fracture fault and breakdown discharge fault.

[0039] In order to better obtain current pulse data, in some embodiments, such as Figure 2 As shown, the current pulse data is acquired by a data sensing module 210 and a data acquisition and processing module 220, wherein the data acquisition and processing module 220 includes a denoising unit 221, an amplifying unit 222 and an acquisition unit 223;

[0040] The data sensing module 210 is used to obtain the current pulse signal generated by the electric spike discharge on the corona electrode through the sensor, wherein the sensor is a high-frequency current sensor based on the Rogowski coil principle, and the sensor is clipped on the grounding wire of the electric precipitation electrode by a snap-on method, and each precipitation electrode grounding wire corresponds to a sensor, and the signal output by the sensor is , assuming the number of ground wires is , then the current pulse signal set output by the sensor is ;

[0041] The de-noising unit 221 is used to de-noise the current pulse signal, wherein the energy spectrum of the current pulse signal generated by the corona electrode breakdown discharge fault Energy spectrum of the normal discharge current pulse signal of the corona electrode The sum of the superposition of the distribution ranges is the superposition energy spectrum The denoising unit 221 uses a filter for denoising, and the bandwidth of the filter is not less than ;

[0042] The amplification unit 222 is used to amplify the current pulse signal, wherein the amplification factor of the amplification unit 222 satisfies The magnification factor is not less than the preset frequency. In this embodiment, the preset frequency is 30dB;

[0043] The acquisition unit 223 is used to collect the de-noised and amplified signal to obtain current pulse data, wherein the real-time sampling rate of the acquisition unit is greater than The preset multiple of the maximum frequency point within the frequency band range, in this embodiment, the preset multiple is 4 to 5 times.

[0044] In order to better determine whether it is a fracture fault or a breakdown discharge fault, in some embodiments, the first characteristic data includes at least one of an amplitude and an energy spectrum.

[0045] It should be noted that the amplitude of the current pulse signal generated by the normal discharge of the corona electrode is Obviously between the amplitude of the current pulse signal generated by the fracture fault The amplitude of the current pulse signal generated by the breakdown discharge fault Between, specifically: ,and , and The corresponding energy spectrum , , Also due to , and There is a certain gap in the energy spectrum distribution range due to the difference in amplitude between them. Therefore, it is possible to judge whether the corona electrode has a corona electrode rupture fault or a breakdown discharge fault based on the difference in the amplitude and energy spectrum of the current pulse signal.

[0046] After determining that the corona electrode has a fault, in order to better locate the fault position, in some embodiments, when the corona electrode has a broken fault, the second characteristic data to be measured is the energy value to be measured, and the specific process of calculating the fault point position is: using the energy accumulation method to calculate the energy value to be measured of the acquired current pulse signal ,according to The reference energy value of the normal discharge current pulse signal of the corona electrode without fault The proportion To calculate the length from the breaking point to the bottom of the corona electrode , in order to determine the location of the corona electrode fracture fault point, the length from the fracture point to the bottom of the corona electrode The calculation formula is:

[0047]

[0048]

[0049] In the formula, Indicates the overall length of the corona electrode.

[0050] When there is a breakdown discharge fault in the corona electrode, the second characteristic data to be measured is the time for the current pulse signal to reach the sensor. The specific process of calculating the fault point position is: using the energy accumulation method to calculate the current pulse signal generated by the breakdown discharge fault, according to the rising edge corresponding to the sampling point reached by the energy accumulation , and combined with the sampling rate time interval , calculate the time it takes for the breakdown discharge fault current pulse signal to reach the sensor , and based on the known reference time of the current pulse signal generated by the breakdown discharge at the top of the corona electrode , comparative analysis and The ratio of the breakdown discharge fault point is calculated and the distance between the breakdown discharge fault point and the top of the corona electrode is calculated. The calculation formula is: .

[0051] In order to further warn of faults, in some embodiments, the method also includes: when a corona electrode has a fracture fault or a breakdown discharge fault, obtaining the third characteristic data to be measured of the current pulse data, determining the severity of the fault according to the third characteristic data, and determining the warning mode based on the severity of the fault.

[0052] Specifically, when there is a broken fault in the corona electrode, the third characteristic data is the length of the broken single corona electrode, and the longer the length of the broken single corona electrode (i.e., the length between the fault point and the sensor), the more serious the fault severity diagnosis; when there is a breakdown discharge fault in the corona electrode, the third characteristic data is the frequency of breakdown discharge in the single corona electrode, and the higher the frequency of breakdown discharge in the single corona electrode, the more serious the fault severity diagnosis.

[0053] In some embodiments, the fault severity includes minor faults, general faults and major faults. When the fault severity is minor faults and general faults, the warning mode is determined to be local warning. When the fault severity is a major fault, the warning mode is determined to be a combination of local and remote warnings. Specifically: when a minor fault occurs in the corona electrode, an on-site warning is given to warn that the corona electrode has a trend of further fault deterioration. When a general fault occurs in the corona electrode, an on-site alarm is given, indicating that the corona electrode has a relatively serious fault and attention should be paid to the operating status of the appliance at all times. When a serious fault occurs in the corona electrode, an on-site alarm is given and the remote person in charge is notified through remote communication methods such as SMS notifications or network notifications, indicating that the appliance has a serious fault and needs emergency treatment.

[0054] The above is a detailed introduction to an electrical fault locating method provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0055] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A method for locating an electrical fault, characterized in that: include: Obtain current pulse data generated by electrical appliance corona discharge; Acquire first characteristic data to be measured of the current pulse data, and judge whether the corona electrode has a rupture fault and a breakdown discharge fault according to the difference between the first characteristic data to be measured and a preset reference first characteristic data when the corona electrode is normal, wherein the first characteristic data includes at least one of an amplitude and an energy spectrum; When there is a fracture fault or a breakdown discharge fault in the corona electrode, the second characteristic data to be measured of the current pulse data is calculated and obtained, and the corona electrode fault point position is determined according to the second characteristic data to be measured; When there is a fracture fault in the corona electrode, the second characteristic data to be measured is the energy value to be measured; Determining the position of the corona electrode fault point according to the second characteristic data to be measured, comprising: calculating and obtaining the length from the breaking point of the fracture fault to the bottom of the corona electrode according to the ratio of the energy value to be measured to the reference energy value of the current pulse data when the corona electrode is normally discharged, so as to determine the position of the corona electrode fault point; When there is a breakdown discharge fault in the corona electrode, the second characteristic data to be measured is the time to be measured when the current pulse signal reaches the sensor; The position of the corona electrode fault point is determined according to the second characteristic data to be measured, including: calculating and obtaining the position of the breakdown discharge fault point according to the ratio of the measured time to the measured time of the current pulse signal generated by the breakdown discharge at the preset corona electrode top to reach the sensor.

2. The electrical fault location method according to claim 1, characterized in that: The current pulse data is acquired by a data sensing module and a data acquisition and processing module, wherein the data acquisition and processing module includes a denoising unit, an amplification unit and an acquisition unit; The data sensing module is used to obtain the current pulse signal generated by the electric spike discharge on the corona electrode through the sensor; The denoising unit is used to denoise the current pulse signal, the amplifying unit is used to amplify the current pulse signal, and the collecting unit is used to collect the denoised and amplified signal to obtain current pulse data.

3. The electrical fault location method according to claim 2, characterized in that: The sensor is a high-frequency current sensor, which is arranged on the grounding wire of the electric settling electrode, and each grounding wire of the settling electrode corresponds to a sensor.

4. The electrical fault location method according to claim 2, characterized in that: The sum of the superposition of the energy spectrum of the current pulse signal generated by the corona electrode breakdown discharge fault and the energy spectrum distribution range of the corona electrode normal discharge current pulse signal is the superimposed energy spectrum. The denoising unit uses a filter for denoising, the bandwidth of the filter is not less than the superimposed energy spectrum, the amplification factor of the amplification unit satisfies the amplification factor of not less than the preset frequency in the superimposed energy spectrum, and the real-time sampling rate of the acquisition unit is greater than the preset multiple of the maximum frequency point within the frequency band of the superimposed energy spectrum.

5. The electrical fault location method according to claim 1, characterized in that: The method also includes: when a corona electrode has a fracture fault or a breakdown discharge fault, obtaining the third characteristic data to be measured of the current pulse data, determining the severity of the fault according to the third characteristic data, and based on the severity of the fault and its corresponding early warning mode.

6. The electrical fault location method according to claim 5, characterized in that: When the corona electrode has a fracture fault, the third characteristic data is the length of the single corona electrode fracture; when the corona electrode has a breakdown discharge fault, the third characteristic data is the frequency of the breakdown discharge of the single corona electrode.

7. The electrical fault location method according to claim 5, characterized in that: The fault severity includes minor fault, general fault and major fault. When the fault severity is minor fault and general fault, the warning mode is determined to be local warning. When the fault severity is major fault, the warning mode is determined to be a combination of local and remote warning.

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