A multi-channel interference suppression device and method

Abstract

The present application provides a multi-channel interference suppression device and method. The device includes a sensor, a first switch, a second switch, and an analog / digital converter. The sensor is connected to the input end of the first switch, the output end of the second switch is connected to the analog / digital converter, a first conditioning circuit is provided between one output end of the first switch and one input end of the second switch, and a second conditioning circuit is provided between the other output end of the first switch and the other input end of the second switch. The sensor is used to acquire the original partial discharge signal, the first conditioning circuit or the second conditioning circuit is used for amplitude amplification and filtering, and the analog / digital converter is used for sampling. The first switch and the second switch are used to initially input the original partial discharge signal to the first conditioning circuit, and when there is an interference signal in the sampling signal, input it to the second conditioning circuit. The device can suppress the interference signal according to the characteristics of the interference signal, and at the same time can improve the in-band flatness.

Description

Technical Field

[0001] This application relates to the field of power technologies, and in particular, to a multi-channel interference suppression device and method. Background Art

[0002] During the operation of power equipment, partial discharge may occur, generating partial discharge signals. Partial discharge has a harmful impact on power equipment and may even affect the normal operation of power equipment seriously. To detect partial discharge of power equipment in time and eliminate the impact on power equipment, it is necessary to detect during the operation of power equipment. For example, detect and analyze the electrical signals in the environment where the power equipment is located to determine whether there is partial discharge in the power equipment.

[0003] The detection equipment generally includes a sensor, an amplifier, a filter, and a sampler. The general detection steps are as follows: The sensor acquires the original partial discharge signal in the environment where the power equipment is located. The amplifier amplifies the amplitude of the acquired original partial discharge signal to facilitate the analysis of the original partial discharge signal. Then, the filter selects a frequency for the original partial discharge signal. The filter can filter out electrical signals within a certain frequency range, and this frequency range can be set according to the general frequency of the partial discharge signals generated by the partial discharge phenomenon of the power equipment. The electrical signal filtered by the filter can be considered as the partial discharge signal generated by the partial discharge phenomenon of the power equipment. The sampler is used to collect the partial discharge signal filtered by the filter.

[0004] However, there may be interference signals in the environment where the power equipment is located, and the amplifier itself may also have interference signals. The frequencies of these interference signals may overlap with the general frequency of the partial discharge signals generated by the partial discharge phenomenon of the power equipment. Then, even after being filtered by the filter, the filtered partial discharge signals still include interference signals. Thus, it cannot be used to accurately determine whether there is partial discharge in the power equipment. Summary of the Invention

[0005] Embodiments of this application provide a multi-channel interference suppression device and method to solve the problem that the existing detection equipment has limited ability to remove interference signals and cannot accurately determine whether there is partial discharge in the power equipment.

[0006] In a first aspect, this application provides a multi-channel interference suppression device, including:

[0007] A first switch, a second switch, and an analog / digital converter;

[0008] The first switch includes an input terminal and two output terminals, and the second switch includes two input terminals and one output terminal; the input terminal of the first switch inputs the partial discharge original signal; the output terminal of the second switch is connected to the analog / digital converter; a first conditioning circuit is provided between one output terminal of the first switch and one input terminal of the second switch; a second conditioning circuit is provided between the other output terminal of the first switch and the other input terminal of the second switch;

[0009] The first conditioning circuit includes a first amplifier and a first filter. The input terminal of the first amplifier is connected to the first switch, the output terminal of the first amplifier is connected to the input terminal of the first filter, and the output terminal of the first filter is connected to the second switch;

[0010] The second conditioning circuit includes a second amplifier and a second filter. The input terminal of the second amplifier is connected to the first switch, the output terminal of the second amplifier is connected to the input terminal of the second filter, and the output terminal of the second filter is connected to the second switch;

[0011] The filtering range of the second filter is a subset of the filtering range of the first filter;

[0012] After the partial discharge original signal is input to the input terminal of the first switch, the first conditioning circuit or the second conditioning circuit is used to amplify and filter the partial discharge original signal to obtain a partial discharge conditioned signal; the analog / digital converter is used to digitally sample the partial discharge conditioned signal to obtain a sampled signal;

[0013] The first switch and the second switch are used to initially input the partial discharge original signal to the first conditioning circuit, and when there is an interference signal in the sampled signal, input the partial discharge original signal to the second conditioning circuit.

[0014] In a second aspect, the present application provides a multi-channel interference suppression method, which is applied to the multi-channel interference suppression device in the first aspect and includes:

[0015] Obtain the partial discharge original signal;

[0016] Input the partial discharge original signal to the first conditioning circuit, and the first conditioning circuit is used to separate a first conditioning signal from the partial discharge original signal, and the first conditioning signal is a signal with a frequency range within the frequency range of the partial discharge original signal;

[0017] Sample the first conditioning signal to obtain a sampled signal;

[0018] If there is an interference signal in the sampled signal, input the partial discharge original signal to the second conditioning circuit, and the second conditioning circuit is used to separate a second conditioning signal from the partial discharge original signal, and the second conditioning signal is a signal with a frequency range within the frequency range of the first conditioning signal.

[0019] As can be seen from the above technical solutions, the embodiments of the present application provide a multi-channel interference suppression device and method. The device includes a sensor, a first switch, a second switch, and an analog / digital converter. The sensor is connected to the input end of the first switch, the output end of the second switch is connected to the analog / digital converter, a first conditioning circuit is provided between one output end of the first switch and one input end of the second switch, and a second conditioning circuit is provided between the other output end of the first switch and the other input end of the second switch. The sensor is used to acquire the original partial discharge signal, and the first conditioning circuit or the second conditioning circuit is used for amplitude amplification and filtering. The analog / digital converter is used for digital sampling. The first switch and the second switch are used to initially input the original partial discharge signal to the first conditioning circuit, and when there is an interference signal in the sampling signal, input the original partial discharge signal to the second conditioning circuit. The device can suppress the interference signal according to the characteristics of the interference signal, and at the same time can improve the flatness in the passband of the signal amplitude-frequency characteristic curve. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a device currently used for partial discharge detection of power equipment;

[0021] Figure 2 is a schematic structural diagram of a multi-channel interference suppression device provided by an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of the amplitude-frequency characteristic curve of the passband compensator provided by an embodiment of the present application;

[0023] Figure 4 is a schematic structural diagram of the first passband compensator provided by an embodiment of the present application;

[0024] Figure 5 is a schematic structural diagram of the second passband compensator provided by an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of the amplitude-frequency characteristic curve of the sampling signal provided by an embodiment of the present application;

[0026] Figure 7 is a schematic flow diagram of the multi-channel interference suppression method provided by an embodiment of the present application.

[0027] Illustration:

[0028] Among them, 01 - sensor; 02 - amplifier; 03 - filter; 04 - sampler; 100 - sensor; 200 - first switch; 201 - first control terminal; 300 - second switch; 301 - second control terminal; 400 - analog / digital converter; 500 - first conditioning circuit; 501 - first amplifier; 502 - first filter; 503 - first in - band compensator; C1 - first capacitor; C2 - second capacitor; C3 - third capacitor; C4 - fourth capacitor; R1 - first resistor; R2 - second resistor; R3 - third resistor; L1 - first inductor; 600 - second conditioning circuit; 601 - second amplifier; 602 - second filter; 603 - second in - band compensator; C5 - fifth capacitor; C6 - sixth capacitor; C7 - seventh capacitor; C8 - eighth capacitor; R4 - fourth resistor; R5 - fifth resistor; R6 - sixth resistor; L2 - second inductor. Detailed implementation mode

[0029] Power equipment uses dielectric materials or other insulators to provide electrical insulation. During the operation of power equipment, when an external voltage is applied to the power equipment, partial discharge will occur in some insulation areas of the power equipment, resulting in partial discharge phenomenon and generating partial discharge signals. The partial discharge phenomenon has harmful effects on power equipment and may even affect the normal operation of power equipment seriously. For example, the partial discharge phenomenon is the main cause and manifestation of the insulation deterioration of power equipment. Seriously, it will cause insulation breakdown of power equipment and affect the insulation life of the insulation area of power equipment. Especially for high - voltage electrical equipment, partial discharge phenomenon is more likely to occur.

[0030] In order to detect the partial discharge phenomenon of power equipment in time and eliminate the influence of the partial discharge phenomenon on power equipment, it is necessary to detect during the operation of power equipment. For example, detect and analyze the electrical signals in the environment where the power equipment is located to judge whether there is a partial discharge phenomenon in the power equipment.

[0031] Figure 1 It is a structural schematic diagram of the equipment currently used for the partial discharge detection of power equipment, as Figure 1As shown in the figure, the detection device includes a sensor 01, an amplifier 02, a filter 03, and a sampler 04. The sensor 01 is arranged on the surface or around the power equipment to be detected, and the sensor 01 can be used to obtain the original partial discharge signal of the environment where the power equipment is located. The output end of the sensor 01 is connected to the input end of the amplifier 02, and the sensor 01 transmits the obtained original partial discharge signal to the amplifier 02. The amplifier 02 is used to amplify the amplitude of the original partial discharge signal to facilitate the analysis of the original partial discharge signal. The output end of the amplifier 02 is connected to the input end of the filter 03. The filter 03 is used to select a frequency for the original partial discharge signal. The filter 03 can filter out the electrical signals within a certain frequency range, and this frequency range can be set according to the general frequency of the partial discharge signals generated by the partial discharge phenomenon of the power equipment. The electrical signal filtered by the filter 03 can be considered as the partial discharge signal generated by the partial discharge phenomenon of the power equipment. The sampler 04 is connected to the output end of the filter 03 and is used to collect the partial discharge signal filtered by the filter 03.

[0032] However, there may be interference signals in the environment where the power equipment is located, and the amplifier has inevitable inherent noise. After the original partial discharge signal is amplified by the amplifier 02, this inherent noise will also be mixed in the original partial discharge signal, forming another interference signal. The frequencies of these interference signals may have overlapping parts with the general frequency of the partial discharge signals generated by the partial discharge phenomenon of the power equipment. Then, even after being filtered by the filter 03, the filtered partial discharge signal still includes interference signals, and the ability of the filter 03 to filter out interference signals is limited. In this way, the partial discharge signal collected by the sampler 04 cannot be used to accurately determine whether there is a partial discharge phenomenon in the power equipment and cannot accurately reflect the degree of partial discharge of the power equipment.

[0033] The embodiment of the present application provides a multi-channel interference suppression device. The device is constructed with multiple channels. One of the channels can be used to remove the interference signals with different frequency ranges from the original partial discharge signal and separate the partial discharge signal. If there are still interference signals in the partial discharge signal, another channel can be used to remove the interference signals with different or overlapping frequency ranges from the partial discharge signal and separate the partial discharge signal, playing a role in suppressing interference.

[0034] The multi-channel interference suppression device provided by the embodiment of the present application can be applied to the partial discharge detection of power equipment such as transformers, gas insulated switchgears (GIS), cables, and switch cabinets.

[0035] The following specifically describes each component of the multi-channel interference suppression device provided by the embodiment of the present application.

[0036] Figure 2 This is a schematic structural diagram of a multi-channel interference suppression device provided by an embodiment of the present application. As Figure 2 shown, the device may include: a sensor 100, a first switch 200, a second switch 300, and an analog-to-digital converter (ADC) 400.

[0037] Among them, the sensor 100 may be disposed on the surface or around the power equipment to be detected, and is used to acquire the partial discharge original signal in the environment where the power equipment is located. As the signal input end of the device, the sensor 100 can input the acquired partial discharge original signal into the multi-channel interference suppression device, so that the multi-channel interference suppression device further processes the partial discharge original signal.

[0038] In the embodiment of the present application, the sensor 100 may be, for example, an ultrasonic sensor or a current sensor, etc., and the present application does not make specific limitations thereon.

[0039] In the embodiment of the present application, the first switch 200 may include one input end and two output ends, and the second switch 300 may include two input ends and one output end. The output end of the sensor 100 may be connected to the input end of the first switch 200. After the sensor 100 acquires the partial discharge original signal, it inputs the partial discharge original signal to the input end of the first switch 200.

[0040] The output end of the second switch 300 may be connected to the analog-to-digital converter 400. A first conditioning circuit 500 may be provided between one output end of the first switch 200 and one input end of the second switch 300, and a second conditioning circuit 600 may be provided between the other output end of the first switch 200 and the other output end of the second switch 300. After the partial discharge original signal is input to the input end of the first switch 200, the first conditioning circuit 500 and the second conditioning circuit 600 may be used to amplify the amplitude and filter the partial discharge original signal to obtain a partial discharge conditioning signal. The partial discharge conditioning signal may include a first conditioning signal and a second conditioning signal, where the first conditioning signal is the signal obtained after the partial discharge original signal passes through the first conditioning circuit 500, and the second conditioning signal is the signal obtained after the partial discharge original signal passes through the second conditioning circuit 600.

[0041] In the embodiments of the present application, the analog / digital converter 400 is a device that converts an input analog signal (such as a voltage signal) into a digital signal. It can be used to digitally sample the input partial discharge conditioning signal to obtain a sampling signal for analyzing the information content in the original partial discharge signal. For example, to determine whether there is an interference signal in the sampling signal.

[0042] In the embodiments of the present application, the first switch 200 and the second switch 300 can be used to respond to a control signal to turn on the first conditioning circuit 500, and the original partial discharge signal input by the sensor 100 can flow through the first conditioning circuit 500 to the analog / digital converter 400. Or, to turn on the second conditioning circuit 600, and the original partial discharge signal input by the sensor 100 can flow through the second conditioning circuit 600 to the analog / digital converter 400.

[0043] In the embodiments of the present application, the first switch 200 and the second switch 300 can be used to initially input the original partial discharge signal to the first conditioning circuit 500. The first conditioning circuit 500 can include a first amplifier 501 and a first filter 502. The input end of the first amplifier 501 can be connected to the first switch 200, the output end of the first amplifier 501 can be connected to the input end of the first filter 502, and the output end of the first filter 502 can be connected to the second switch 300.

[0044] In the embodiments of the present application, the first amplifier 501 can be used to amplify the amplitude of the original partial discharge signal so that the subsequent circuit can normally recognize the original partial discharge signal. The first amplifier 501 can be an operational amplifier or a radio frequency amplifier, etc., and the present application does not make specific limitations on this.

[0045] During the actual operation of power equipment, it will be disturbed in many aspects, making the partial discharge signal and the interference signal show different characteristics. The frequencies of the interference signal and the partial discharge signal usually show dispersion in different frequency ranges. For example, the interference signal is generally a high-frequency signal, and the partial discharge signal is generally a low-frequency signal.

[0046] In the embodiments of the present application, the first filter 502 can be used to select the frequency of the amplified original partial discharge signal to obtain a first conditioning signal, and the frequency of the first conditioning signal is within the filtering range of the first filter 502. The filtering range of the first filter 502 can be set according to the general frequency of the partial discharge signal generated by the partial discharge of the power equipment. In this way, the first conditioning signal obtained after the original partial discharge signal passes through the first filter 502 includes the partial discharge signal generated by the partial discharge of the power equipment, and the high-frequency interference signals with frequencies not within the filtering range of the first filter 502 are filtered out. Therefore, the first conditioning signal contains rich information related to the partial discharge of the power equipment.

[0047] Exemplarily, the first filter 502 may be a low-pass filter, which allows low-frequency signals below the cut-off frequency to pass through and does not allow high-frequency signals above the cut-off frequency to pass through. Since the partial discharge signals generated by the partial discharge of electrical equipment are generally low-frequency signals, the high-frequency interference signals above the cut-off frequency, which are mixed with the partial discharge signals in the original partial discharge signal, have been filtered out.

[0048] In the embodiment of the present application, the first filter 502 may be a 40 MHz low-pass filter, and the parameters of the low-pass filter may be designed according to the actual partial discharge situation, and the present application does not make specific limitations thereon.

[0049] In the embodiment of the present application, the first conditioning signal may flow into the analog / digital converter 400 through the second switch 300, and the analog / digital converter 400 performs digital sampling on the first conditioning signal to obtain a sampling signal. The embodiment of the present application can analyze the sampling signal to obtain parameters such as the peak voltage of partial discharge, the magnitude of the discharge amount, and the phase-amplitude relationship of partial discharge, and can judge whether there is a partial discharge phenomenon in the electrical equipment and know the degree of insulation aging of the electrical equipment through the above parameters.

[0050] If there is an overlapping area between the frequency ranges of some interference signals and the partial discharge signals generated by the partial discharge phenomenon of electrical equipment, then in the first conditioning signal obtained by frequency selection through the first filter 502, there are still low-frequency interference signals mixed. At this time, there are also interference signals in the sampling signal obtained by digital sampling of the first conditioning signal, and it cannot be directly used to analyze the partial discharge situation of the electrical equipment.

[0051] In the embodiment of the present application, it also includes judging whether there are interference signals in the sampling signal. If there are no interference signals in the sampling signal, then the sampling signal can be directly used to analyze the partial discharge signal situation of the electrical equipment.

[0052] If there are interference signals in the sampling signal, the first switch 200 and the second switch 300 can also be used to input the original partial discharge signal to the second conditioning circuit 600. The second conditioning circuit 600 may include a second amplifier 601 and a second filter 602. The input end of the second amplifier 601 may be connected to the first switch 200, the output end of the second amplifier 601 may be connected to the input end of the second filter 602, and the output end of the second filter 602 may be connected to the second switch 300.

[0053] In the embodiment of the present application, the second amplifier 601 can be used to amplify the amplitude of the original partial discharge signal so that the subsequent circuit can normally identify the original partial discharge signal. The second amplifier 601 can be an operational amplifier or a radio frequency amplifier, etc., and the present application does not make specific limitations thereon.

[0054] In the embodiment of the present application, the second filter 602 can be used to perform frequency selection on the amplified original partial discharge signal to obtain a second conditioning signal, and the frequency of the second conditioning signal is within the frequency range of the second filter 602. Among them, the frequency range of the second filter 602 can be a subset of the frequency range of the first filter 502, that is to say, the second conditioning signal is a signal with a frequency range within the frequency range of the first conditioning signal.

[0055] During the operation of the power equipment, it may be interfered by narrowband signals. There is an overlapping area between the frequency range of the narrowband interference signal and the frequency range of the partial discharge signal. Therefore, the interference signal existing in the first conditioning signal is a narrowband interference signal. The second filter 602 can play a role in filtering out the narrowband interference signal and obtaining the second conditioning signal. In this way, the analog / digital converter 400 performs digital sampling on the second conditioning signal, and a sampling signal without interference signals can be obtained, and this sampling signal can be directly used to analyze the partial discharge signal of the power equipment.

[0056] The second filter 602 can be a band-pass filter, and the band-pass filter can allow signals in a specific frequency band to pass through while shielding signals in other frequency bands. Therefore, narrowband interference signals in other frequency bands outside the specific frequency band that are mixed with the partial discharge signal in the original partial discharge signal will be filtered out.

[0057] In the embodiment of the present application, the second filter 602 can be a 20 MHz - 40 MHz band-pass filter, and the parameters of the band-pass filter can be designed according to the actual partial discharge situation, and the present application does not make specific limitations thereon.

[0058] In the embodiment of the present application, the multi-channel interference suppression device may further include an oscilloscope, and the oscilloscope can be used to display the amplitude-frequency characteristic curve of the sampling signal to facilitate the intuitive observation of the sampling signal.

[0059] In the embodiment of the present application, the first switch 200 may further include a first control terminal 201, the second switch may further include a second control terminal 301, and the first control terminal 201 and the second control terminal 301 can be coupled to the control pin. The multi-channel interference suppression device provided in the embodiment of the present application can send control signals to the first switch 200 and the second switch 300 through the control pin, and the first switch 200 and the second switch 300 can quickly respond to the control signal to change the on / off state of the first conditioning circuit 500 or the second conditioning circuit 600.

[0060] When a first electrical level is input to the first switch 200 and the second switch 300 through the control pin, the first switch 200 and the second switch 300 input the partial discharge original signal to the first conditioning circuit 500. When a second electrical level is input to the first switch 200 and the second switch 300 through the control pin, the first switch 200 and the second switch 300 input the partial discharge original signal to the second conditioning circuit 600. The first electrical level is different from the second electrical level. For example, the first electrical level is a high level and the second electrical level is a low level, or the first electrical level is a low level and the second electrical level is a high level.

[0061] In the embodiment of the present application, the first switch 200 and the second switch 300 can be programmable controlled switches, and the switching of the working states of the first switch 200 and the second switch 300 is realized through programming.

[0062] As can be seen from the above technical solutions, the multi-channel interference suppression device provided by the embodiment of the present application first obtains the partial discharge original signal of the environment where the power equipment is located, and inputs the partial discharge original signal to the first amplifier 501 and the first filter 502. The first amplifier 501 can amplify the amplitude of the partial discharge original signal, and the first filter 502 can filter the amplified partial discharge original signal to obtain a first conditioning signal, and the high-frequency interference signal is filtered out after filtering. After digital sampling of the first conditioning signal, a sampling signal is obtained. If the sampling signal at this time does not include a narrowband interference signal, then the sampling signal has a relatively wide frequency range, including rich information related to the partial discharge of the power equipment, and can be used for analyzing the partial discharge of the power equipment within a relatively large frequency range.

[0063] If the sampling signal at this time includes a narrowband interference signal, the device can input the partial discharge original signal to the second amplifier 601 and the second filter 602. The second amplifier 601 can amplify the amplitude of the partial discharge original signal, and the second filter 602 can filter the amplified partial discharge original signal to obtain a second conditioning signal, and the high-frequency interference signal and the narrowband interference signal are filtered out after filtering. The sampling signal at this time does not have interference signals and can be used for accurate analysis of the partial discharge of the power equipment within the frequency range.

[0064] When an electrical signal passes through an amplifier, the amplifier amplifies the amplitude of the electrical signal. The amplifier has a large low-frequency gain and a small high-frequency gain, and the frequency response will cause attenuation within the passband. That is to say, the amplitude attenuation intensity of the electrical signal changes with the change of frequency. The low-frequency attenuation is small, and the high-frequency attenuation is large. This is an inherent characteristic of the amplifier. The attenuation of the amplitude will cause the problem of poor inband spectrum ripple in the amplitude-frequency characteristic curve of the electrical signal. The amplitude-frequency characteristic curve with poor inband flatness cannot accurately reflect the characteristics of the electrical signal. Therefore, when the first amplifier 501 and the second amplifier 601 amplify the partial discharge original signal, the partial discharge original signal will have amplitude attenuation. At this time, the amplitude-frequency characteristic curve of the sampled signal obtained by sampling has poor inband flatness. The multi-channel interference suppression device provided in the embodiments of the present application may further include a compensator within the passband to compensate for the amplitude attenuation and improve the inband flatness of the amplitude-frequency characteristic curve.

[0065] Figure 3 It is a schematic diagram of the amplitude-frequency characteristic curve of the compensator within the passband provided in the embodiments of the present application. As Figure 3 shown, the compensator within the passband provided in the embodiments of the present application has the characteristic of more low-frequency attenuation and less high-frequency attenuation. For example, within the frequency range of 5 MHz - 10 MHz, the curve slope is large and the amplitude attenuation amount is large. Within the frequency range of 40 MHz - 45 MHz, the curve slope is small and the amplitude attenuation amount is small. Therefore, this compensator within the passband has an amplitude-frequency characteristic opposite to that of the amplifier and can be used to compensate for the amplitude attenuation caused by the amplifier to play an equalizing role.

[0066] Continue to refer to Figure 2 , the first conditioning circuit 500 may include a first compensator 503 within the passband. The input end of the first compensator 503 within the passband may be connected to the output end of the first filter 502, and the output end of the first compensator 503 within the passband may be connected to the input end of the second switch 300. After the partial discharge original signal passes through the first amplifier 501, the first filter 502, and the first compensator 503 within the passband in sequence, a first conditioned signal is obtained. Then, the analog / digital converter 400 performs digital sampling on the first conditioned signal to obtain a sampled signal. The amplitude-frequency characteristic of the first compensator 503 within the passband is opposite to that of the first amplifier 501 and can be used to compensate for the amplitude attenuation generated after the partial discharge original signal passes through the first amplifier 501 to play an equalizing role.

[0067] The second conditioning circuit 600 may include a second in-band compensator 603. The input end of the second in-band compensator 603 may be connected to the output end of the second filter 602, and the output end of the second in-band compensator 603 may be connected to the input end of the second switch 300. After the partial discharge original signal passes through the second amplifier 601, the second filter 602, and the second in-band compensator 603 in sequence, a second conditioned signal is obtained. Then, the analog / digital converter 400 performs digital sampling on the second conditioned signal to obtain a sampled signal. The amplitude-frequency characteristic of the second in-band compensator 603 is opposite to that of the second amplifier 601, and it can be used to compensate for the amplitude attenuation generated after the partial discharge original signal passes through the second amplifier 601.

[0068] Figure 4 FIG. is a schematic structural diagram of the first in-band compensator provided by an embodiment of the present application. As Figure 4 shown, the first in-band compensator 503 may be a bridge-T amplitude compensator. Specifically, the first in-band compensator 503 may include a first capacitor C1, a second capacitor C2, a first resistor R1, and a first inductor L1. One end of the first capacitor C1 is the input end of the first in-band compensator 503, and one end of the second capacitor C2 is the output end of the first in-band compensator 503. A first branch and a second branch are provided between the first capacitor C1 and the second capacitor C2. The first branch includes a second resistor R2 and a third resistor R3 connected in series, and the second branch includes a third capacitor C3 and a fourth capacitor C4 connected in series. One end of the first resistor R1 is connected between the third capacitor C3 and the fourth capacitor C4, and the other end is connected to one end of the first inductor L1. The other end of the first inductor L1 is grounded.

[0069] Figure 5 FIG. is a schematic structural diagram of the second in-band compensator provided by an embodiment of the present application. As Figure 5 shown, the second in-band compensator 603 may be a bridge-T amplitude compensator. Specifically, the second in-band compensator 603 may include a fifth capacitor C5, a sixth capacitor C6, a fourth resistor R4, and a second inductor L2. One end of the fifth capacitor C5 is the input end of the second in-band compensator 603, and one end of the sixth capacitor C6 is the output end of the second in-band compensator 603. A third branch and a fourth branch are provided between the fifth capacitor C5 and the sixth capacitor C6. The third branch includes a fifth resistor R5 and a sixth resistor R6 connected in series, and the fourth branch includes a seventh capacitor C7 and an eighth capacitor C8 connected in series. One end of the fourth resistor R4 is connected between the seventh capacitor C7 and the eighth capacitor C8, and the other end is connected to one end of the second inductor L2. The other end of the second inductor L2 is grounded.

[0070] Figure 6This is a schematic diagram of the amplitude-frequency characteristic curve of the sampling signal in the embodiment of the present application. For ease of description, the amplitude-frequency characteristic curve of the sampling signal before amplitude compensation is referred to as curve K1, and the amplitude-frequency characteristic curve of the sampling signal after amplitude compensation is referred to as curve K2. As Figure 6 shown, the amplitude-frequency characteristic curve K1 of the electrical signal before the in-band compensator has poor in-band flatness, and the amplitude-frequency characteristic curve K2 of the electrical signal after the in-band compensator has better in-band flatness, and the flatness has been greatly improved.

[0071] It can be seen from the above technical solutions that the multi-channel interference suppression device provided in the embodiment of the present application can suppress high-frequency interference signals and narrowband interference signals, and at the same time can improve the in-band flatness of the signal amplitude-frequency characteristic curve.

[0072] The embodiment of the present application also provides a multi-channel interference suppression method, which is applied to the multi-channel interference suppression device provided in the embodiment of the present application. Figure 7 This is a schematic diagram of the flow of the multi-channel interference suppression method provided in the embodiment of the present application. As Figure 7 shown, the method may include:

[0073] S1: Obtain the partial discharge original signal;

[0074] S2: Input the partial discharge original signal into the first conditioning circuit, and the first conditioning circuit is used to separate the first conditioning signal from the partial discharge original signal, and the first conditioning signal is a signal with a frequency range within the frequency range of the partial discharge original signal;

[0075] Among them, the first conditioning circuit can filter out high-frequency interference signals in the partial discharge original signal.

[0076] S3: Sample the first conditioning signal to obtain a sampling signal;

[0077] S4: If there is an interference signal in the sampling signal, input the partial discharge original signal into the second conditioning circuit, and the second conditioning circuit is used to separate the second conditioning signal from the partial discharge original signal, and the second conditioning signal is a signal with a frequency range within the frequency range of the first conditioning signal.

[0078] Among them, if there are also narrowband interference signals in the partial discharge signal in addition to high-frequency interference signals, the second conditioning circuit can filter out high-frequency interference signals and narrowband interference signals in the partial discharge original signal.

[0079] It can be seen that the multi-channel interference suppression method provided in the embodiment of the present application can suppress interference through the first conditioning circuit to obtain the first conditioning signal. If there is still an interference signal in the first conditioning signal, the interference can be suppressed through the second conditioning circuit to obtain the second conditioning signal with a frequency within the frequency range of the first conditioning signal.

[0080] Among them, the first conditioning circuit can specifically be used to amplify the amplitude of the original partial discharge signal and perform frequency selection on the amplified original partial discharge signal to obtain a first conditioned signal.

[0081] The second conditioning circuit can specifically be used to amplify the amplitude of the partial discharge signal and perform frequency selection on the amplified original partial discharge signal to obtain a second conditioned signal.

[0082] The first conditioning circuit and the second conditioning circuit are also used to perform amplitude compensation on the frequency-selected original partial discharge signal to eliminate the amplitude attenuation generated after the amplification of the original partial discharge signal.

[0083] It should be noted that for the acquisition and input of the original partial discharge signal, the structural design and working principle of the first conditioning circuit, the structural design and working principle of the second conditioning circuit, and the sampling of the signal mentioned in the method embodiments can all be referred to the foregoing embodiments of the multi-channel interference suppression device, which will not be elaborated herein.

[0084] As can be seen from the above technical solutions, the multi-channel interference suppression method provided by the embodiments of the present application can suppress high-frequency interference signals and narrowband interference signals, and at the same time can improve the in-band flatness of the signal amplitude-frequency characteristic curve.

[0085] It is easy to understand that those skilled in the art can combine, split, and recombine the embodiments of the present application based on several embodiments provided by the present application to obtain other embodiments, and these embodiments do not exceed the protection scope of the present application.

[0086] The above specific implementation manners further elaborate the purpose, technical solutions, and beneficial effects of the embodiments of the present application. It should be understood that the above are only the specific implementation manners of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. A multi-channel interference suppression device, characterized in that, Comprising: A first switch, a second switch, and an analog / digital converter; The first switch includes an input terminal and two output terminals, and the second switch includes two input terminals and one output terminal; the input terminal of the first switch inputs a partial discharge original signal; the output terminal of the second switch is connected to the analog / digital converter; a first conditioning circuit is provided between one output terminal of the first switch and one input terminal of the second switch; a second conditioning circuit is provided between the other output terminal of the first switch and the other input terminal of the second switch; The first conditioning circuit includes a first amplifier and a first filter. The input terminal of the first amplifier is connected to the first switch, the output terminal of the first amplifier is connected to the input terminal of the first filter, and the output terminal of the first filter is connected to the second switch; The second conditioning circuit includes a second amplifier and a second filter. The input terminal of the second amplifier is connected to the first switch, the output terminal of the second amplifier is connected to the input terminal of the second filter, and the output terminal of the second filter is connected to the second switch; The filtering range of the second filter is a subset of the filtering range of the first filter; After the input terminal of the first switch inputs the partial discharge original signal, the first conditioning circuit or the second conditioning circuit is used to amplify and filter the amplitude of the partial discharge original signal to obtain a partial discharge conditioning signal; the analog / digital converter is used to perform digital sampling on the partial discharge conditioning signal to obtain a sampling signal; The first switch and the second switch are used to initially input the partial discharge original signal to the first conditioning circuit, and when there is an interference signal in the sampling signal, input the partial discharge original signal to the second conditioning circuit; The first conditioning circuit further includes a first in-band compensator. The input terminal of the first in-band compensator is connected to the output terminal of the first filter, and the output terminal of the first in-band compensator is connected to the input terminal of the second switch. The amplitude-frequency characteristic of the first in-band compensator is opposite to the amplitude-frequency characteristic of the first amplifier, and is used to compensate for the amplitude attenuation generated after the partial discharge original signal passes through the first amplifier; The second conditioning circuit further includes a second in-band compensator. The input terminal of the second in-band compensator is connected to the output terminal of the second filter, and the output terminal of the second in-band compensator is connected to the input terminal of the second switch. The amplitude-frequency characteristic of the second in-band compensator is opposite to the amplitude-frequency characteristic of the second amplifier, and is used to compensate for the amplitude attenuation generated after the partial discharge original signal passes through the second amplifier.

2. The multi-channel interference suppression device according to claim 1, characterized in that The first switch further includes a first control terminal, the second switch further includes a second control terminal, and the first control terminal and the second control terminal are coupled to a control pin. When a first level is input to the first switch and the second switch through the control pin, the first switch and the second switch input the partial discharge original signal to the first conditioning circuit; When a second level is input to the first switch and the second switch through the control pin, the first switch and the second switch input the partial discharge original signal to the second conditioning circuit; The first level is different from the second level; The multi-channel interference suppression device further includes: a sensor, the sensor is connected to the input end of the first switch, and the sensor is configured to input the partial discharge original signal to the input end of the first switch after acquiring the partial discharge original signal.

3. The multi-channel interference suppression device according to claim 1, characterized in that, The first amplifier is configured to amplify the amplitude of the partial discharge original signal; the first filter is configured to perform frequency selection on the amplified partial discharge original signal to obtain a first conditioning signal, and the frequency of the first conditioning signal is within the filtering range of the first filter.

4. The multi-channel interference suppression device according to claim 3, wherein The second amplifier is configured to amplify the amplitude of the partial discharge original signal; the second filter is configured to perform frequency selection on the amplified partial discharge original signal to obtain a second conditioning signal; the frequency of the second conditioning signal is within the filtering range of the second filter.

5. The multi-channel interference suppression device according to claim 1, wherein The first in-band compensator includes: a first capacitor, a second capacitor, a first resistor, and a first inductor; One end of the first capacitor is the input end of the first in-band compensator, and one end of the second capacitor is the output end of the first in-band compensator; A first branch and a second branch are arranged between the first capacitor and the second capacitor. The first branch includes a second resistor and a third resistor connected in series, and the second branch includes a third capacitor and a fourth capacitor connected in series; One end of the first resistor is connected between the third capacitor and the fourth capacitor, and the other end is connected to one end of the first inductor, and the other end of the first inductor is grounded.

6. The multi-channel interference suppression device according to claim 1, characterized in that, The second in-band compensator includes: a fifth capacitor, a sixth capacitor, a fourth resistor, and a second inductor; One end of the fifth capacitor is the input end of the second in-band compensator, and one end of the sixth capacitor is the output end of the second in-band compensator; A third branch and a fourth branch are arranged between the fifth capacitor and the sixth capacitor. The third branch includes a fifth resistor and a sixth resistor connected in series, and the fourth branch includes a seventh capacitor and an eighth capacitor connected in series; One end of the fourth resistor is connected between the seventh capacitor and the eighth capacitor, and the other end is connected to one end of the second inductor, and the other end of the second inductor is grounded.

7. A multi-channel interference suppression method, applied to the multi-channel interference suppression device according to any one of claims 1-6, characterized in that, Including: Acquire the partial discharge original signal; Input the partial discharge original signal to a first conditioning circuit, and the first conditioning circuit is configured to separate a first conditioning signal from the partial discharge original signal, and the first conditioning signal is a signal whose frequency range is within the frequency range of the partial discharge original signal; Sample the first conditioning signal to obtain a sampling signal; If there is an interference signal in the sampling signal, the partial discharge original signal is input to a second conditioning circuit, and the second conditioning circuit is configured to separate a second conditioning signal from the partial discharge original signal, where the second conditioning signal is a signal with a frequency range within the frequency range of the first conditioning signal; The first conditioning circuit and the second conditioning circuit are further configured to perform amplitude compensation on the partial discharge original signal after frequency selection to eliminate the amplitude attenuation generated after amplification of the partial discharge original signal.

8. The multi-channel interference suppression method according to claim 7, wherein The first conditioning circuit is configured to amplify the amplitude of the partial discharge original signal and perform frequency selection on the amplified partial discharge original signal to obtain the first conditioning signal; The second conditioning circuit is configured to amplify the amplitude of the partial discharge original signal and perform frequency selection on the amplified partial discharge original signal to obtain the second conditioning signal.

Images