CN112462205A - Partial discharge detection apparatus and method - Google Patents
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Abstract
The present application relates to an apparatus and method for partial discharge detection. The device comprises: a partial discharge detection device is characterized by comprising an ultrasonic detector array, a signal processor and a display, wherein the ultrasonic detector array comprises a plurality of ultrasonic detectors; the ultrasonic detector is used for receiving ultrasonic signals within a preset detection angle range and transmitting the ultrasonic signals to the signal processor; the difference value between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold value; and the signal processor is used for processing the ultrasonic signals received by the ultrasonic detectors in the ultrasonic detector array to obtain effective signals and frequency and position information of the effective signals, and outputting the effective signals and the frequency and position information of the effective signals to the display for displaying. The device can accurately judge the partial discharge position and frequency of the electrical equipment, and avoid large faults and losses of the electrical equipment.
Description
Technical Field
The application relates to the technical field of partial discharge detection of power equipment, in particular to a partial discharge detection device.
Background
With the increasing use of power systems in life, the scale of power grid construction is also expanding. The safe operation of the electrical equipment is an important guarantee for the safe and reliable operation of the power grid, and whether the insulation of the electrical equipment is good or not directly influences whether the electrical equipment can safely operate or not. Partial discharge detection is an effective means of judging the quality of the insulation system.
Currently, the partial discharge detection methods generally adopted can be classified into two types, one is access type (contact type) detection, and the other is non-contact type detection, wherein the non-contact type detection mainly judges partial discharge by detecting electromagnetic waves, sound waves and the like.
However, the above non-contact detection method is not accurate in detecting the partial discharge, and is liable to cause a large failure and loss in the electrical equipment.
Disclosure of Invention
In view of the above, there is a need to provide a partial discharge detection apparatus and a method capable of accurately measuring the magnitude of the partial discharge frequency and accurately positioning the partial discharge position.
A partial discharge detection apparatus comprising an ultrasonic probe array, a signal processor and a display, the ultrasonic probe array comprising a plurality of ultrasonic probes;
the ultrasonic detector is used for receiving ultrasonic signals within a preset detection angle range and transmitting the ultrasonic signals to the signal processor; the difference value between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold value;
the signal processor is configured to process the ultrasonic signals received by each ultrasonic probe in the ultrasonic probe array to obtain effective signals and frequency and position information of each effective signal, and output the effective signals and the frequency and position information of each effective signal to the display for display.
In one embodiment, the ultrasound probe array is an array of a plurality of ultrasound probes regularly arranged.
In one embodiment, the ultrasound probe array includes 16 ultrasound probes, and the 16 ultrasound probes are arranged in four rows and four columns.
In one embodiment, the receiving frequency range of the ultrasonic detector is 2KHz to 80 KHz.
In one embodiment, the signal processor is configured to process the ultrasonic signals received by each of the ultrasonic detectors in the ultrasonic detector array to obtain effective signals and frequency and position information of each of the effective signals, and includes:
the signal processor is configured to perform analog-to-digital conversion on the ultrasonic signals received by the ultrasonic detectors to obtain digital signals, convert the digital signals from time domain signals to frequency domain signals, and filter invalid signals and interference signals in the frequency domain signals to obtain the frequency and position information of the valid signals and the valid signals.
In one embodiment, the invalid signal is a signal with a frequency outside a preset valid frequency range, and the interference signal is a signal with the same frequency received by the ultrasonic probe aiming at different directions and/or objects.
In one embodiment, the display is configured to display the effective signals and the positions of the effective signals in an equal scale according to the size of the ultrasound probe array.
A partial discharge detection method applied to the partial discharge detection apparatus according to any one of claims 1 to 7, the method comprising:
receiving ultrasonic signals within each preset detection angle range; the difference value between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold value;
processing each ultrasonic signal to obtain effective signals and frequency and position information of each effective signal;
and displaying the effective signals and the frequency and position information of each effective signal.
In one embodiment, the processing each ultrasonic signal to obtain effective signals and frequency and position information of each effective signal includes:
performing analog-to-digital conversion on each ultrasonic signal to obtain a digital signal;
converting the digital signal from a time domain signal to a frequency domain signal;
and filtering invalid signals and interference signals in the frequency domain signals to obtain the effective signals and the frequency and position information of each effective signal.
In one embodiment, the invalid signal is a signal with a frequency outside a preset valid frequency range, and the interference signal is a signal with the same frequency received by the ultrasonic probe and directed to different directions and objects.
According to the partial discharge detection device and the partial discharge detection method, the ultrasonic detector array formed by the ultrasonic detectors receives ultrasonic signals in a preset detection angle range, the ultrasonic signals are transmitted to the signal processor, the signal processor processes the ultrasonic signals to obtain the frequency and position information of effective signals and effective signals, and the frequency and position information of the effective signals are output to the display to be displayed. In this embodiment, the detection angle range of each ultrasonic detector in the ultrasonic detector array is set, so that the detection result of the ultrasonic detector array is accurate, therefore, the partial discharge monitoring device can acquire the frequency and the position information of an effective signal and an effective signal generated by partial discharge, and can display the frequency and the position information in a display, and the frequency and the position information of the partial discharge can be visually observed, so that the position of the electrical equipment generating the partial discharge and the frequency of the ultrasonic wave of the partial discharge can be accurately judged, further, the electrical equipment generating the partial discharge is maintained and overhauled, and the large fault and loss of the electrical equipment are avoided.
Drawings
FIG. 1 is a block diagram of a partial discharge detection apparatus in one embodiment;
FIG. 2 is a graph showing partial discharge locations in one embodiment;
FIG. 3 is a diagram of an array of regularly arranged ultrasound probes in one embodiment;
FIG. 4 is a block diagram of a partial discharge detection apparatus in one embodiment;
FIG. 5 is a schematic flow chart of a partial discharge detection method according to an embodiment;
FIG. 6 is a flow diagram illustrating a method for processing signals by a signal processor according to one embodiment;
description of reference numerals:
an ultrasonic detector array 11; an ultrasonic probe 111; a signal processor 12;
a display 13.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
At present, the commonly adopted partial discharge detection methods are divided into two categories, one category is access type (contact type) detection, such as a pulse current method, a chemical detection method and a photometric method, equipment which is likely to discharge is connected with a sensor of a testing instrument, the change of related quantity is detected, the method is generally used for test testing of non-charged equipment, the method has certain danger during charged detection, and the detection cannot be generally carried out during high-voltage charging; the other type is non-contact detection, in which partial discharge is judged mainly by detecting electromagnetic waves, acoustic waves, or the like. The electromagnetic wave detection principle is that when partial discharge occurs, electromagnetic wave radiation with a certain frequency is generated, whether the partial discharge phenomenon occurs can be detected by using a high-sensitivity electromagnetic wave receiver, and the detection method is easily interfered by the environment and has high requirement on the environment; the detection principle of the sound detection method is that sound waves are emitted outwards during partial discharge, and whether partial discharge occurs or not is determined by monitoring sound through a sound detection sensor, but the partial discharge is greatly interfered by the outside. The detection method has inaccurate detection result of partial discharge, and is easy to cause large fault and loss to electrical equipment. Based on this, the following embodiments of the present application provide a partial discharge detection apparatus and method, which can solve the above technical problems. The following specifically describes examples of the present application.
Fig. 1 is a block diagram of a partial discharge detection apparatus according to an embodiment of the present application, as shown in fig. 1, the partial discharge detection apparatus includes an ultrasonic probe array 11, a signal processor 12, and a display 13, where the ultrasonic probe array 11 includes a plurality of ultrasonic probes 111;
the ultrasonic detector 111 is used for receiving ultrasonic signals within a preset detection angle range and transmitting the ultrasonic signals to the signal processor; the difference value between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold value;
the signal processor 12 is configured to process the ultrasonic signals received by the ultrasonic probes 111 in the ultrasonic probe array 11 to obtain effective signals and frequency and position information of the effective signals, and output the effective signals and the frequency and position information of the effective signals to the display 13 for display.
In the present embodiment, the ultrasonic detector array 11 is configured to receive ultrasonic signals within a preset detection angle range and transmit the ultrasonic signals to the signal processor. The detection angle range may be 1 degree, 5 degrees or 10 degrees, which is not limited in this embodiment.
The ultrasonic detector array is composed of a plurality of ultrasonic detectors, each ultrasonic detector receives ultrasonic signals within a corresponding detection angle range and transmits the received ultrasonic signals to the signal processor. For example, the ultrasound probe array may arrange a plurality of ultrasound probes in a regular array, or in a random combination of a random arrangement.
Optionally, the regular arrangement mode of the ultrasonic detector array may be a square arrangement mode, a rectangular arrangement mode, a circular arrangement mode, or a diamond arrangement mode, which is not limited in the embodiment of the present application.
Wherein, the difference value between the maximum angle and the minimum angle of the detection angle range of each ultrasonic detector is smaller than a preset threshold value. For example, if the preset threshold is X degrees, the maximum angle of the detection range of one ultrasound probe in the ultrasound probe array is a degrees, and the minimum angle is B degrees, i.e., the angle range (a-B) detected by the ultrasound probe must be smaller than X degrees, i.e., the ultrasound probe can only receive ultrasound signals within the angle range (a-B) degrees.
Wherein, the receiving frequency range of each ultrasonic detector can be 2KHz to 100KHz or 1KHz to 80KHz, and can also be 1KHz to 100 KHz.
Preferably, the receiving frequency of each ultrasonic probe may be 2KHz to 80 KHz.
In the present embodiment, the signal processor 12 is configured to process the ultrasonic signals received by the ultrasonic probes 111 in the ultrasonic probe array 11 to obtain the effective signals and the frequency and position information of the effective signals, and output the effective signals and the frequency and position information of the effective signals to the display 13 for display. When the signal processor receives the ultrasonic signals transmitted by the ultrasonic detector array, the ultrasonic signals received by the ultrasonic detector array are subjected to operation processing, invalid signals and interference signals are filtered, the frequency and position information of effective signals and effective signals are obtained, and the frequency and position information of the effective signals and the effective signals are transmitted to the display.
Optionally, the Signal processor 12 may be implemented by a Micro Control Unit (MCU) chip, a dsp (digital Signal processing) chip, or a Field Programmable Gate Array (FPGA) chip, which is not limited in this embodiment.
In this embodiment, fig. 2 is a partial discharge position display diagram, as shown in fig. 2, the display 13 may display each effective signal on the display screen according to the position of each effective signal, and the display may display each effective signal in an enlarged manner or in a reduced manner, which is not limited in this embodiment. For example, if the size of the ultrasound probe array is 20cm by 20cm, the display may show the size of the ultrasound probe array on a scale of 1:1.5, showing the size of the ultrasound probe array 30cm by 30cm, or 40cm by 40cm, and the display may show the size of the ultrasound probe array on a scale of 2:1, showing the size of the ultrasound probe array 20cm by 20 cm.
The partial discharge monitoring device provided by the embodiment of the application comprises an ultrasonic detector array 11, a signal processor 12 and a display 13. Wherein the ultrasound probe array 11 is composed of a plurality of ultrasound probes 111. The ultrasonic detector array receives ultrasonic signals within a preset detection angle range and transmits the ultrasonic signals to the signal processor, and the signal processor processes the ultrasonic signals received by the ultrasonic detectors in the ultrasonic detector array to obtain effective signals and frequency and position information of the effective signals, and outputs the effective signals and the frequency and position information of the effective signals to the display 13 for display. In this embodiment, since the detection angle range of each ultrasonic detector in the ultrasonic detector array is set, the difference between the maximum angle and the minimum angle of the detection angle range is smaller than the preset threshold, that is, the detectable angle range of each ultrasonic detector is small, so that the position of the ultrasonic signal detected by each ultrasonic detector is more accurate, and the partial discharge monitoring device can acquire the effective signal generated by the partial discharge and the frequency and the position information of the effective signal, and display the frequency and the position information in the display, so as to visually observe whether the electrical equipment to be detected generates the partial discharge, and visually observe the position information and the ultrasonic frequency of the partial discharge, and further maintain and overhaul the electrical equipment generating the partial discharge, thereby avoiding large faults and losses of the electrical equipment.
Fig. 3 is a diagram of an array of regularly arranged ultrasonic detectors according to an embodiment of the present invention, in which the array of ultrasonic detectors 11 is configured to receive ultrasonic signals within a predetermined detection angle range and transmit the ultrasonic signals to a signal processor. As shown in fig. 3, the ultrasound probe array 11 employs an array system in which a plurality of ultrasound probes 111 are regularly arranged. The ultrasonic detector array is arranged in a 4-by-4 square array mode, namely, the ultrasonic detector array comprises 16 ultrasonic detectors; the output end of the ultrasonic detector is connected with the input end of the signal processor.
In the present embodiment, the ultrasonic detector 111 is configured to receive an ultrasonic signal within a preset detection angle range, and transmit the ultrasonic signal within the preset detection angle range to the signal receiver. Wherein, the difference value between the maximum angle and the minimum angle of the detection angle range of each ultrasonic detector is smaller than a preset threshold value. For example, if the preset threshold is 1 degree, the maximum angle of the detection range of one ultrasound probe in the ultrasound probe array is 2 degrees, and the minimum angle is 1 degree, i.e., the detection range of the ultrasound probe can only be between 1 degree and 2 degrees. Wherein, an ultrasonic detector receives the ultrasonic signal in a preset detection angle scope to send ultrasonic signal to signal processor, and an input end that signal processor is connected to an ultrasonic detector's output, and 16 ultrasonic detectors that also can receive 16 ultrasonic signal and transmit respectively for signal processor. Wherein, the receiving frequency range of the ultrasonic detector is 2KHz to 80 KHz.
In the partial discharge detection apparatus provided in the embodiment of the present application, the ultrasonic detector array 11 employs a 4 × 4 array mode in which 16 ultrasonic detectors 111 are regularly arranged, and is configured to receive an ultrasonic signal within a preset detection angle range, and transmit the ultrasonic signal to the signal processor. Because ultrasonic detector's preset detection angle scope is little to arrange ultrasonic detector according to the array mode of regular array, this kind of ultrasonic detector array is simple easily to be operated, can accurate receiving ultrasonic signal and the accurate position that fixes a position each ultrasonic wave and correspond.
Fig. 4 is a block diagram of a phase angle detection apparatus according to an embodiment of the present application, and as shown in fig. 4, the partial discharge detection apparatus includes: an ultrasonic detector array 11, a signal processor 12 and a display 13; the ultrasonic detector array comprises 16 ultrasonic detectors, and the 16 ultrasonic detectors are arranged according to a rule of 4 by 4, referring to the ultrasonic detector array which is arranged according to the rule shown in fig. 2; the output end of each ultrasonic detector is connected with the 16-path input end of the signal processor; the output end of the signal processor is connected with the display.
In this embodiment, the ultrasonic detector array may receive an ultrasonic signal within a preset detection angle range, and transmit the received ultrasonic signal to the signal processor, and the signal processor processes the ultrasonic signals received by the 16 ultrasonic detectors in the ultrasonic detector array to obtain an effective signal and corresponding position information corresponding to the effective signal in the ultrasonic detector array, and outputs the effective signal and the corresponding position information corresponding to the effective signal in the ultrasonic detector array to the display for display. In this embodiment, the partial discharge monitoring device can acquire the effective signal generated by the partial discharge and the frequency and position information of the effective signal, and can display the frequency and position information in the display, so that the frequency and position information of the partial discharge can be visually observed, the position of the electrical equipment generating the partial discharge and the frequency of the ultrasonic wave of the partial discharge can be accurately judged, the electrical equipment generating the partial discharge is maintained and overhauled, and the large fault and loss of the electrical equipment are avoided.
Based on any one of the embodiments shown in fig. 1-4, the signal processor processes the ultrasonic signals received by the ultrasonic detectors in the ultrasonic detector array to obtain effective signals and frequency and position information of the effective signals, and outputs the effective signals and the frequency and position information of the effective signals to the display for displaying.
In this embodiment, the signal processor performs analog-to-digital conversion on the ultrasonic signals received by each ultrasonic detector to obtain digital signals, converts the digital signals from time domain signals to frequency domain signals, and filters invalid signals and interference signals in the frequency domain signals to obtain valid signals and frequency and position information of each valid signal.
The signal processor can comprise an AD conversion module, the effective frequency range corresponding to the effective signal can be preset to be 25KHz-45KHz, after the input end of the signal processor acquires ultrasonic signals received by each ultrasonic detector in the ultrasonic detector array, the ultrasonic signals are analog signals at the moment, the AD conversion module is used for AD analog-to-digital conversion on the ultrasonic signals to obtain digital signals, and fast Fourier transform is carried out on the digital signals to convert the digital signals from time domain signals to frequency domain signals; if the frequency of the frequency domain signal is out of the effective frequency range, the frequency domain signal is an invalid signal and is filtered; and if the frequency of the frequency domain signal is in the effective frequency range, judging whether the frequency domain signal is an interference signal, aligning the ultrasonic detector array to different directions and objects, if the frequency of the received signal is the same as the frequency of the frequency domain signal, determining the frequency domain signal is an interference signal, otherwise, determining the frequency of the received signal is different from the frequency of the frequency domain signal, and determining the frequency domain signal is an effective signal. For example, the effective frequency range corresponding to the effective signal is preset to be 25KHz-45KHz, and the frequency of the frequency domain signal at this time is 10KHz, which is an invalid signal; or the frequency signal at this time is 30KHz, it is necessary to determine whether the signal is an interference signal, the ultrasonic detector array may be aligned to different directions and/or objects, the signal is an interference signal if the received signal frequency is 30KHz, and the ultrasonic signal with the signal frequency of 30KHz is an effective signal if the received signal frequency is 26 KHz.
In this embodiment, the signal processor processes the received ultrasonic signal, and filters the invalid signal and the interference signal to obtain the valid signal, so that the interference of the invalid signal and the interference signal to the determined discharge position can be avoided, the accuracy of the position where the electrical equipment generates the partial discharge is further ensured, the electrical equipment generating the partial discharge is further maintained and overhauled, and the large fault and loss of the electrical equipment are avoided. Moreover, the method is simple and effective, the logic control is simple, and the software and hardware cost is lower.
The above embodiment describes a partial discharge detection apparatus, and now a detection method of a partial discharge monitoring apparatus is described, in one embodiment, as shown in fig. 5, a phase angle detection method is provided, which is exemplified by the method applied to the partial discharge detection apparatus in fig. 1 to 4, and includes the following steps:
step S501, receiving ultrasonic signals within each preset detection angle range; the difference between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold.
In this embodiment, as shown in any one of the embodiments in fig. 1 to 4, the partial discharge detection apparatus includes an ultrasonic detector array, a signal processor, and a display, and the ultrasonic detector array receives an ultrasonic signal within a preset detection angle range and transmits the ultrasonic signal to the signal processor. For example, the ultrasound probe array may be arranged in an array manner as 4 × 4 in fig. 2, that is, 16 ultrasound probes are included, and each ultrasound probe receives the ultrasound signals within its corresponding detection angle range and transmits the ultrasound signals to the signal processor, that is, the ultrasound probe array receives 16 sets of ultrasound signals and transmits the ultrasound signals to the signal processor, that is, the signal processor may process 16 sets of ultrasound signals simultaneously. The difference between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold. For example, if the preset threshold is 1 degree, the maximum angle of the detection range of one ultrasound probe in the ultrasound probe array is 2 degrees, and the minimum angle is 1 degree, i.e., the detection range of the ultrasound probe can only be between 1 degree and 2 degrees.
Step S502, each ultrasonic signal is processed to obtain effective signals and frequency and position information of each effective signal.
In this embodiment, the signal processor is configured to perform operation processing on the ultrasonic signals received by the ultrasonic detectors 111 in the ultrasonic detector array 11, and after the input end of the signal processor acquires the ultrasonic signals received by the ultrasonic detectors in the ultrasonic detector array, the signal processor performs operation conversion processing on the ultrasonic signals, and filters out invalid signals and interference signals to obtain valid signals and frequency and position information of the valid signals, and transmits the valid signals and the frequency and position information of the valid signals to the display. After the ultrasonic signal is converted, the amplitude of the signal frequency at the moment can be compared with the amplitude of the preset frequency, and invalid signals and interference signals are filtered, namely the peak value and the valley value of the signal amplitude at the moment are respectively compared with the range of the peak value and the valley value of the preset amplitude frequency; and if the peak value and the valley value of the amplitude frequency of the received signal are the same as those of the frequency amplitude of the converted ultrasonic signal, the ultrasonic detector array is an interference signal, otherwise, the ultrasonic detector array is an effective signal. The method for filtering the invalid signal and the interference signal may also be that, after the ultrasonic signal is converted, the invalid signal and the interference signal are filtered according to the comparison between the amplitude of the signal at the moment and the preset frequency amplitude, and if the frequency of the ultrasonic signal converted at the moment is out of the effective frequency range, the ultrasonic signal is the invalid signal and is filtered; if the frequency of the converted ultrasonic signal is in the effective frequency range, whether the ultrasonic signal is an interference signal or not is judged, the ultrasonic detector array is aligned to different directions and objects, if the frequency of the received signal is the same as that of the converted ultrasonic signal, the ultrasonic signal is an interference signal, otherwise, the frequency of the received signal is different from that of the converted ultrasonic signal, and the ultrasonic signal is an effective signal. For example, the valid frequency range is 25KHz-45KHz, and the frequency of the converted ultrasonic signal is 10KHz, which is an invalid signal. Or at this time, if the frequency of the converted ultrasonic signal is 30KHz, it is determined whether the ultrasonic signal is an interference signal, the ultrasonic detector array is aligned to different directions and objects, if the frequency of the received signal is 30KHz, the ultrasonic signal is an interference signal, and if the frequency of the received signal is 26KHz, the ultrasonic signal with the frequency of 30KHz is an effective signal. The invalid signals and the interference signals are filtered to obtain the effective signals and the frequency and position information of each effective signal, and the frequency and position information of the effective signals and each effective signal are output to the display 13 to be displayed.
In step S503, the effective signals and the frequency and position information of each effective signal are displayed.
In this embodiment, the display 13 may display each effective signal on the display screen according to the position of each effective signal, and the display may display each effective signal in an enlarged manner or in a reduced manner, which is not limited in this embodiment. . For example, if the size of the ultrasound probe array is 20cm by 20cm, the display may show the size of the ultrasound probe array on a scale of 1:1.5, showing the size of the ultrasound probe array 30cm by 30cm, or 40cm by 40cm, and the display may show the size of the ultrasound probe array on a scale of 2:1, showing the size of the ultrasound probe array 20cm by 20 cm.
In the partial discharge detection method provided in the embodiment of the present application, the ultrasonic detector array receives an ultrasonic signal within a preset detection angle range, and transmits the ultrasonic signal to the signal processor, and the signal processor processes the ultrasonic signal received by each ultrasonic detector in the ultrasonic detector array to obtain an effective signal and frequency and position information of each effective signal, and outputs the effective signal and the frequency and position information of each effective signal to the display 13 for display. In this embodiment, the partial discharge monitoring device can acquire the effective signal generated by the partial discharge and the frequency and position information of the effective signal, and can display the frequency and position information in the display, so that the frequency and position information of the partial discharge can be visually observed, the position of the electrical equipment generating the partial discharge and the frequency of the ultrasonic wave of the partial discharge can be accurately judged, the electrical equipment generating the partial discharge is maintained and overhauled, and the large fault and loss of the electrical equipment are avoided.
In the above embodiment, a simple description is made on the partial discharge detection method, and now a simple description is made on the processing method in which the signal processor processes the received ultrasonic signals, in one embodiment, as shown in fig. 6, the step S502 "processing each ultrasonic signal to obtain the effective signal and the frequency and position information of each effective signal" may include the following steps:
step S601, performing analog-to-digital conversion on each ultrasonic signal to obtain a digital signal.
Specifically, the ultrasonic signal received by the signal processor is an analog signal, and the signal processor may have an AD conversion module for performing AD conversion on the ultrasonic signal to convert the ultrasonic signal into a digital signal.
Step S602 converts the digital signal from a time domain signal to a frequency domain signal.
Specifically, the digital signal subjected to analog-to-digital conversion is subjected to fast fourier transform, so that the digital signal is converted from a time domain signal to a frequency domain signal.
Step S603, filtering the invalid signals and the interference signals in the frequency domain signal to obtain valid signals and frequency and position information of each of the valid signals.
Specifically, if the frequency of the frequency domain signal at this time is outside the effective frequency range, the frequency domain signal is an invalid signal and is filtered; and if the frequency of the frequency domain signal is in the effective frequency range, judging whether the frequency domain signal is an interference signal, aligning the ultrasonic detector array to different directions and objects, if the frequency of the received signal is the same as the frequency of the frequency domain signal, determining the frequency domain signal is an interference signal, otherwise, determining the frequency of the received signal is different from the frequency of the frequency domain signal, and determining the frequency domain signal is an effective signal. For example, the valid frequency range is 25KHz-45KHz, and the frequency domain signal at this time is 20KHz, which is an invalid signal. Or if the frequency signal is 35KHz, it is determined whether the ultrasonic detector array is an interference signal, and the ultrasonic detector array is aligned to different directions and objects, and if the received signal frequency is 35KHz, the ultrasonic detector array is an interference signal, and if the received signal frequency is 30KHz, the ultrasonic detector array is an effective signal. The invalid signals and the interference signals are filtered to obtain the effective signals and the frequency and position information of each effective signal, and the frequency and position information of the effective signals and each effective signal are output to the display 13 to be displayed.
In the partial discharge detection method provided in the embodiment of the present application, the signal processor processes the ultrasonic signals received by the ultrasonic detectors in the ultrasonic detector array to obtain the effective signals and the frequency and position information of each effective signal, and outputs the effective signals and the frequency and position information of each effective signal to the display 13 for display. In this embodiment, signal processor can convert the back with the ultrasonic signal that receives, compare with preset effective frequency, and filter invalid signal and interfering signal, guarantee to give the display effective signal and positional information transmission, this kind of method is simple effective, logic control is simple, it is possible to show the positional information of partial discharge point for the display show etc. ratio, frequency size and the positional information of partial discharge are so that observe the partial discharge directly perceivedly, thereby can accurately judge the position that electrical equipment produced partial discharge and the ultrasonic frequency size of partial discharge, and then maintain and overhaul the electrical equipment that produces partial discharge, avoid causing big trouble and loss to electrical equipment.
It should be understood that, although the steps in the flowcharts of fig. 5 and 6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 5 and 6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as 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 application, 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 concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A partial discharge detection apparatus, comprising an ultrasonic detector array, a signal processor and a display, the ultrasonic detector array comprising a plurality of ultrasonic detectors;
the ultrasonic detector is used for receiving ultrasonic signals within a preset detection angle range and transmitting the ultrasonic signals to the signal processor; the difference value between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold value;
the signal processor is configured to process the ultrasonic signals received by each ultrasonic probe in the ultrasonic probe array to obtain effective signals, and frequency and position information of each effective signal, and output the effective signals, and the frequency and position information of each effective signal to the display for display.
2. The partial discharge detector according to claim 1, wherein the ultrasonic probe array is an array in which a plurality of ultrasonic probes are regularly arranged.
3. The partial discharge detection apparatus of claim 2 wherein the ultrasonic detector array comprises 16 ultrasonic detectors, and the 16 ultrasonic detectors are arranged in four rows and four columns.
4. The partial discharge detection apparatus according to any one of claims 1 to 3, wherein the reception frequency of the ultrasonic probe is in a range of 2KHz to 80 KHz.
5. The partial discharge detection apparatus according to any one of claims 1 to 3, wherein the signal processor is configured to process the ultrasonic signals received by each of the ultrasonic detectors in the ultrasonic detector array to obtain effective signals, and frequency and position information of each of the effective signals, and includes:
the signal processor is configured to perform analog-to-digital conversion on the ultrasonic signals received by the ultrasonic detectors to obtain digital signals, convert the digital signals from time domain signals to frequency domain signals, and filter invalid signals and interference signals in the frequency domain signals to obtain the frequency and position information of the valid signals and the valid signals.
6. The partial discharge detection apparatus according to claim 5, wherein the invalid signal is a signal having a frequency outside a preset valid frequency range, and the interference signal is a signal having the same frequency and being received by the ultrasonic probe aiming at different directions and/or objects.
7. The partial discharge detection apparatus of any one of claims 1 to 3 wherein the display is adapted to display the valid signals and the position of each valid signal in equal proportion to the size of the ultrasound probe array.
8. A partial discharge detection method applied to the partial discharge detection apparatus according to any one of claims 1 to 7, the method comprising:
receiving ultrasonic signals within each preset detection angle range; the difference value between the maximum angle and the minimum angle of the detection angle range is smaller than a preset threshold value;
processing each ultrasonic signal to obtain effective signals and frequency and position information of each effective signal;
and displaying the effective signals and the frequency and position information of each effective signal.
9. The method of claim 8, wherein processing each of the ultrasonic signals to obtain a valid signal and frequency and location information of each of the valid signals comprises:
performing analog-to-digital conversion on each ultrasonic signal to obtain a digital signal;
converting the digital signal from a time domain signal to a frequency domain signal;
and filtering invalid signals and interference signals in the frequency domain signals to obtain the effective signals and the frequency and position information of each effective signal.
10. The method according to claim 9, wherein the invalid signal is a signal having a frequency outside a preset valid frequency range, and the interference signal is a signal having the same frequency and being received by the ultrasound probe aiming at different directions and/or objects.
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Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101300484A (en) * | 2005-11-21 | 2008-11-05 | 杰富意钢铁株式会社 | Pipe ultrasonic flaw detecting apparatus and ultrasonic flaw detecting method |
| CN101644738A (en) * | 2009-09-02 | 2010-02-10 | 江苏省电力公司常州供电公司 | Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus |
| CN102841370A (en) * | 2012-09-25 | 2012-12-26 | 上海海事大学 | Underground pipeline detection device and method based on reflection-type ultrasonic sensor |
| KR20130028545A (en) * | 2011-09-09 | 2013-03-19 | 한국남부발전 주식회사 | Partial discharging signal detector of power system |
| CN103344943A (en) * | 2013-06-28 | 2013-10-09 | 河南省电力公司南阳供电公司 | Ultrasonic image positioning detecting device of transformer substation |
| CN103454564A (en) * | 2013-08-22 | 2013-12-18 | 江苏科技大学 | Partial discharge detecting system and method for high voltage switch cabinet |
| CN103969560A (en) * | 2014-05-28 | 2014-08-06 | 北达正视(北京)科技有限公司 | Visual ultrasonic detection system for partial discharge failure detection |
| CN105572673A (en) * | 2015-11-27 | 2016-05-11 | 北京像素软件科技股份有限公司 | Ultrasonic ranging method and device |
| CN207007993U (en) * | 2017-06-22 | 2018-02-13 | 广西电网有限责任公司电力科学研究院 | A kind of measuring device with electricity of partial discharge of transformer |
| CN107884774A (en) * | 2017-12-01 | 2018-04-06 | 太原理工大学 | A kind of supersonic range finder of the anti-interference transless driving of multi-frequency |
| CN108037410A (en) * | 2017-11-24 | 2018-05-15 | 华北电力大学 | A kind of shelf depreciation method for ultrasonic locating and device based on controllable responding power |
| CN109009905A (en) * | 2018-08-21 | 2018-12-18 | 钟祥博谦信息科技有限公司 | A kind of ultrasonic blind guiding method, apparatus |
| CN109310397A (en) * | 2017-04-26 | 2019-02-05 | 深圳迈瑞生物医疗电子股份有限公司 | Supersonic imaging apparatus, ultrasound image Enhancement Method and guiding puncture display methods |
| CN109471111A (en) * | 2018-10-10 | 2019-03-15 | 浙江大学 | It is a kind of can acoustic resistive wave interference ultrasonic sensor group and object localization method |
| CN208654316U (en) * | 2018-08-10 | 2019-03-26 | 北京云迹科技有限公司 | Ultrasonic sensor, robot |
| CN109696664A (en) * | 2019-01-07 | 2019-04-30 | 广州小鹏汽车科技有限公司 | A kind of detection method and detection device of ultrasonic wave co-channel interference |
| CN109901172A (en) * | 2019-03-28 | 2019-06-18 | 如皋忠广电子技术有限公司 | Ultrasonic ranging method, device and the electronic equipment adjusted based on frequency |
| CN110161386A (en) * | 2019-05-06 | 2019-08-23 | 贵州电网有限责任公司 | A kind of portable high-pressure cable connector local discharge detection device and method |
-
2020
- 2020-10-23 CN CN202011146533.2A patent/CN112462205A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101300484A (en) * | 2005-11-21 | 2008-11-05 | 杰富意钢铁株式会社 | Pipe ultrasonic flaw detecting apparatus and ultrasonic flaw detecting method |
| CN101644738A (en) * | 2009-09-02 | 2010-02-10 | 江苏省电力公司常州供电公司 | Local discharge detecting system of sulfur hexafluoride gas-insulating and fully-enclosed combined electric apparatus |
| KR20130028545A (en) * | 2011-09-09 | 2013-03-19 | 한국남부발전 주식회사 | Partial discharging signal detector of power system |
| CN102841370A (en) * | 2012-09-25 | 2012-12-26 | 上海海事大学 | Underground pipeline detection device and method based on reflection-type ultrasonic sensor |
| CN103344943A (en) * | 2013-06-28 | 2013-10-09 | 河南省电力公司南阳供电公司 | Ultrasonic image positioning detecting device of transformer substation |
| CN103454564A (en) * | 2013-08-22 | 2013-12-18 | 江苏科技大学 | Partial discharge detecting system and method for high voltage switch cabinet |
| CN103969560A (en) * | 2014-05-28 | 2014-08-06 | 北达正视(北京)科技有限公司 | Visual ultrasonic detection system for partial discharge failure detection |
| CN105572673A (en) * | 2015-11-27 | 2016-05-11 | 北京像素软件科技股份有限公司 | Ultrasonic ranging method and device |
| CN109310397A (en) * | 2017-04-26 | 2019-02-05 | 深圳迈瑞生物医疗电子股份有限公司 | Supersonic imaging apparatus, ultrasound image Enhancement Method and guiding puncture display methods |
| CN207007993U (en) * | 2017-06-22 | 2018-02-13 | 广西电网有限责任公司电力科学研究院 | A kind of measuring device with electricity of partial discharge of transformer |
| CN108037410A (en) * | 2017-11-24 | 2018-05-15 | 华北电力大学 | A kind of shelf depreciation method for ultrasonic locating and device based on controllable responding power |
| CN107884774A (en) * | 2017-12-01 | 2018-04-06 | 太原理工大学 | A kind of supersonic range finder of the anti-interference transless driving of multi-frequency |
| CN208654316U (en) * | 2018-08-10 | 2019-03-26 | 北京云迹科技有限公司 | Ultrasonic sensor, robot |
| CN109009905A (en) * | 2018-08-21 | 2018-12-18 | 钟祥博谦信息科技有限公司 | A kind of ultrasonic blind guiding method, apparatus |
| CN109471111A (en) * | 2018-10-10 | 2019-03-15 | 浙江大学 | It is a kind of can acoustic resistive wave interference ultrasonic sensor group and object localization method |
| CN109696664A (en) * | 2019-01-07 | 2019-04-30 | 广州小鹏汽车科技有限公司 | A kind of detection method and detection device of ultrasonic wave co-channel interference |
| CN109901172A (en) * | 2019-03-28 | 2019-06-18 | 如皋忠广电子技术有限公司 | Ultrasonic ranging method, device and the electronic equipment adjusted based on frequency |
| CN110161386A (en) * | 2019-05-06 | 2019-08-23 | 贵州电网有限责任公司 | A kind of portable high-pressure cable connector local discharge detection device and method |
Non-Patent Citations (2)
| Title |
|---|
| 王鹏等: "基于EFPI传感器的立体形阵列传感器对局放测向的仿真分析", 《电测与仪表》 * |
| 王鹏等: "基于EFPI传感器的立体形阵列传感器对局放测向的仿真分析", 《电测与仪表》, vol. 56, no. 20, 25 October 2019 (2019-10-25), pages 24 - 30 * |
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