CN112051473A - High-frequency partial discharge signal detection system and method - Google Patents
High-frequency partial discharge signal detection system and method Download PDFInfo
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- CN112051473A CN112051473A CN202010967996.9A CN202010967996A CN112051473A CN 112051473 A CN112051473 A CN 112051473A CN 202010967996 A CN202010967996 A CN 202010967996A CN 112051473 A CN112051473 A CN 112051473A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The system can control and start the first channel or the second channel according to the amplitude of a signal to be detected, when the amplitude of the signal to be detected is higher than a preset value, the first channel is started, so that the signal to be detected is directly output to an analog-to-digital (A/D) converter, the situation that the large-amplitude discharge signal cannot be detected due to saturation is avoided, when the amplitude of the signal to be detected is not higher than the preset value, the second channel is started, namely, the signal to be detected is subjected to low-noise amplification processing through the second channel, and capture of a small signal is guaranteed. Therefore, the high-frequency partial discharge signal detection system provided by the embodiment of the application has a large dynamic range.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a system and a method for detecting a high-frequency partial discharge signal.
Background
During the operation of the power equipment, local electric field distortion and local field intensity concentration can cause a local discharge phenomenon. The insulation performance of the electric power equipment is seriously impaired by local heat generation due to the local discharge, impact of charged particles, chemically active products, radiation rays, and the like.
The high-frequency partial discharge detection refers to the process of collecting, analyzing and processing pulse current signals generated by partial discharge in a frequency range of 3MHz-30 MHz. The high-frequency partial discharge detection system is characterized in that a signal acquisition unit acquires an initial discharge signal, converts the acquired initial discharge signal into a digital signal, and a signal processing unit processes, analyzes and displays the digital signal. In general, in order to enable the signal acquisition unit to capture the tiny discharge signals, a Low Noise Amplifier (LNA) is provided in the signal acquisition unit, and most of the noise in the signals is filtered by the LNA, so that the tiny discharge signals are captured. For large amplitude discharge signals, large amplitude discharge signals are lost because they cause LNA saturation.
Therefore, the dynamic range of the signal acquisition unit is small, and the signal acquisition unit cannot detect a tiny discharge signal and a large discharge signal at the same time.
Disclosure of Invention
The application provides a high-frequency partial discharge signal detection system, a control method and a detection method, which aim to solve the problems that a signal acquisition unit in the existing detection system has a small dynamic range and cannot simultaneously detect a small discharge signal and a large discharge signal.
In a first aspect, the present application provides a high-frequency partial discharge signal detection system, including: a controller, a first path, a second path, a path switcher and an A/D converter;
the controller is connected with the access switcher and used for judging the amplitude of the signal to be detected; when the amplitude of the signal to be detected is judged to be larger than a preset value, controlling the path switcher to be switched on to the first path so as to directly convey the signal to be detected to the A/D converter through the first path; when the amplitude of the signal to be detected is judged to be not larger than a preset value, controlling the path switcher to be switched on to the second path so as to convey the signal to be detected to the second path and convey the signal processed by the second path to the A/D converter;
the second channel is used for carrying out low-noise amplification processing on the signal to be detected;
the controller is also connected with the output end of the A/D converter and is used for detecting the partial discharge signal according to the signal output by the A/D converter.
In a second aspect, the present application further provides a high-frequency partial discharge signal detection method, including:
acquiring a signal to be detected, and judging the amplitude of the signal to be detected;
if the amplitude of the signal to be detected is larger than a preset value, the signal to be detected is transmitted to a first channel, and the signal to be detected is directly transmitted to an A/D converter through the first channel;
if the amplitude of the signal to be detected is not larger than a preset value, the signal to be detected is transmitted to a second channel, low-noise amplification processing is carried out on the signal to be detected through the second channel, and the processed signal is transmitted to an A/D converter;
and detecting a partial discharge signal according to the signal output by the A/D converter.
According to the technical scheme, the system and the method for detecting the high-frequency partial discharge signal are characterized in that the system receives an initial current signal through a high-frequency current sensor, and performs first-stage filtering processing on the initial current signal through a first adjustable filter, so that most of interference signals and noise signals are filtered; and then controlling to enable the first path or the second path according to the output signal of the A/D converter, specifically, when the amplitude of the output signal of the A/D converter is higher than a preset threshold, enabling the first path, that is, directly outputting the output signal of the first tunable filter to the A/D converter, avoiding saturation caused by low-noise amplification, so that a large-amplitude discharge signal cannot be detected, and when the amplitude of the output signal of the A/D converter is not higher than the preset threshold, enabling the second path, that is, performing low-noise amplification processing on the output signal of the first tunable filter through a device included in the second path, so as to guarantee capture of a tiny signal. Therefore, the high-frequency partial discharge signal detection system provided by the embodiment of the application has a large dynamic range.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a high frequency partial discharge signal detection system as exemplary illustrated herein;
FIG. 2 is a schematic diagram of a high frequency partial discharge signal detection system as exemplary shown herein;
FIG. 3 is a schematic diagram of an exemplary tunable filter configuration;
FIG. 4 is a schematic diagram of a simulation curve of the tunable filter of FIG. 3;
fig. 5 is a flowchart illustrating a high frequency partial discharge signal detection method according to an exemplary embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a high-frequency partial discharge signal detection system exemplarily shown in the present application, and as shown in fig. 1, the detection system includes: the device comprises a high-frequency current sensor, a signal acquisition unit, a power frequency phase unit and a signal processing and analyzing unit. When the detection system works, the high-frequency current sensor finishes receiving the local discharge signal, and the power frequency phase unit acquires a power frequency reference phase; the signal acquisition unit conditions and converts the analog signals of the partial discharge signals and the power frequency phase into digital signals, and the signal processing and analyzing unit completes the processing, analysis, display, human-computer interaction and the like of the digital signals.
The low noise amplifier is an amplifier with a very low noise coefficient, and is used for amplifying a weak signal and simultaneously improving the signal-to-noise ratio of an output. In the application of detecting high-frequency partial discharge signals, in order to enable a signal acquisition unit of a high-frequency partial discharge signal detection system to capture weak discharge signals, a Low Noise Amplifier (LNA) is arranged on the signal acquisition unit, so that the weak discharge signals can be captured by the LNA.
However, although a Low Noise Amplifier (LNA) is advantageous for capturing a small discharge signal, the LNA is saturated by a large discharge signal, and thus cannot detect a large discharge signal. Therefore, the dynamic range of a signal acquisition unit in the conventional high-frequency partial discharge signal detection system is small, and a micro discharge signal and a large discharge signal cannot be detected simultaneously.
In order to solve the above problems, the present application provides a high-frequency partial discharge signal detection system, which can detect a small discharge signal and does not lose a large-amplitude discharge signal, and has a large dynamic range. Fig. 2 is a block diagram illustrating a high-frequency partial discharge signal detection system according to an exemplary embodiment of the present application, and as shown in fig. 2, the high-frequency partial discharge signal detection system provided by the present application may include: a high frequency current sensor 210, a first tunable filter 220, a first path switch 230, a first path 240, a second path 250, a second path switch 260, an a/D converter 270, and a controller 280.
The first path switch 230 and the second path switch 260 may be collectively referred to as a path switch. The controller 280 may be an FPGA (Field Programmable Gate Array).
Referring to fig. 2, the output of the high frequency current sensor 210 is connected to the input of the first tunable filter 220, and the output of the first tunable filter 220 is connected to the input of the first path switch 230. The first path switch 230 includes two outputs, one of which is connected to one end of the first path 240 and the other of which is connected to the second path 250. The second path switch 260 includes two inputs, one of which is connected to the other end of the first path 240 and the other of which is connected to the other end of the second path 250. The output terminal of the second channel switch 260 is connected to the input terminal of the a/D converter 270, the output terminal of the a/D converter 270 is connected to the controller 280, and the controller 280 is further connected to the first tunable filter 220, the first channel switch 230 and the second channel switch 260 respectively.
As can be seen from fig. 2, in the high frequency partial discharge signal detection system provided in the present application, the first tunable filter 220, the first path switch 230, the first path 240, the second path 250, and the second path switch 260 constitute an LNA processing unit, and the LNA processing unit includes two signal paths, i.e., the first path 240 and the second path 250. Firstly, the high-frequency current sensor 210 outputs the received initial partial discharge signal to the first tunable filter 220, and the first tunable filter 220 performs first-stage filtering processing on the initial signal to obtain a signal to be detected, so that interference signals and noise signals are greatly limited; then, the controller 280 controls the path switch to a different path, i.e. the first path 240 or the second path 250, according to the magnitude of the amplitude of the signal to be detected, and when the path switch connects the first tunable filter 220 to the different path, the signal to be detected is processed differently; finally, the controller 280 detects a partial discharge signal according to the output signal of the a/D converter 270, thereby alarming according to the detection result.
Specifically, when the amplitude of the signal to be detected exceeds the predetermined value, it is indicated that the signal includes a large amplitude signal, at this time, the controller 280 controls the first path switch 230 and the second path switch 260 to communicate the first path 240 with the first tunable filter 220, so that the signal to be detected is directly output to the a/D converter 270 through the first path 240, so as to implement LNA bypass of the large amplitude discharge signal and improve the upper limit of the dynamic range of the LNA processing unit; when the amplitude of the signal to be detected does not exceed the predetermined value, it is described that the signal mainly includes a medium amplitude and a small signal, at this time, the controller 280 controls the first path switch 230 and the second path switch 260 to communicate the second path 250 with the first tunable filter 220, so that the signal to be detected is output to the a/D converter 270 through the second path 250, and the second path 250 performs low-noise amplification processing on the input signal to capture the small signal therein, thereby ensuring the lower limit of the dynamic range of the LNA processing unit.
In some embodiments, the controller 280 controls the switching circuit to switch to the first path when it is determined that the signal processed through the second path and output by the a/D converter is in a saturated state, and transmits the detection signal to be detected to the a/D converter through the first path, so that the user can check and confirm the real signal condition.
It can be seen from the above that, the high-frequency partial discharge signal detection system provided by the application has the LNA bypass function, does not lose a large-amplitude current signal, can capture a small current signal, and has a large dynamic range.
As shown in fig. 2, second path 250 includes a second tunable filter 252. The detection system further comprises a D/a converter 290 (not shown in fig. 2, see fig. 3), wherein the D/a converter is connected to the first tunable filter and the second tunable filter, and the controller 280 is connected to the first tunable filter and the second tunable filter through the D/a converter, so that the controller can adjust the center frequency of the first tunable filter and/or the second tunable filter by adjusting the voltage of the D/a converter. For example, when the controller 280 detects a frequency bin interference in the output signal of the a/D converter, the center frequency of the first tunable filter and/or the second tunable filter is adjusted by adjusting the voltage of the D/a converter, so as to filter out the frequency bin interference.
In the example shown in fig. 2, the controller 280 controls the first tunable filter 220 and the second tunable filter 252 in a coordinated manner, that is, the controller 280 is connected to the first tunable filter and the second tunable filter through the same D/a converter. It should be appreciated that in other embodiments of the present application, controller 280 may control first tunable filter 220 and second tunable filter 252 separately, i.e., controller 280 may be coupled to the first tunable filter and the second tunable filter via two D/a converters, respectively, to adjust the voltage of the D/a converter coupled to the first tunable filter when the center frequency of the first tunable filter needs to be adjusted, and to adjust the voltage of the D/a converter coupled to the second tunable filter when the center frequency of the second tunable filter needs to be adjusted.
With continued reference to fig. 2, the second path 250 includes, in addition to the second tunable filter, a first amplifier 251, a second amplifier 253, a first low-pass filter 254, a third amplifier 255, and a second low-pass filter 256, which are connected in series. Wherein, the input terminal of the first amplifier 251 is connected to an output terminal of the first path switch 230, so as to receive the output signal of the first tunable filter 220 and perform the first stage amplification process on the output signal; the input end of the second tunable filter 252 is connected to the output end of the first amplifier 251 to receive the signal after the first stage of amplification and perform the second stage of filtering processing on the signal; the input end of the second amplifier 253 is connected to the output end of the second tunable filter 252 to receive the signal after the second stage of filtering processing and perform the second stage of amplification processing on the signal; the input end of the first low-pass filter 254 is connected to the output end of the second amplifier 253 to receive the signal after the second stage of amplification and perform the first low-pass filtering on the signal; the input end of the third amplifier 255 is connected to the output end of the first low-pass filter 254, so as to receive the signal after the first low-pass filtering process, and perform a third-stage amplification process on the signal; the input end of the second low-pass filter 256 is connected to the output end of the third amplifier 255 to receive the signal after the third amplification processing, and perform the second low-pass filtering processing on the signal; an output terminal of the second low-pass filter 256 is connected to an input terminal of the second path switch 260 to output the second low-pass filtered signal to the a/D converter 270.
In the embodiment of the present application, the first amplifier 251, the second amplifier 253, and the third amplifier 255 all use a low noise amplifier of the radio frequency amplifiers.
In some embodiments, the tunable filter to which the present application relates may include: a plurality of inductors, a first variable capacitor, a second variable capacitor, a plurality of inductors, and an inductance changeover switch, which are provided on a signal input side; the controller 280 is connected to the inductance switch, and by controlling the inductance switch, the inductor on the signal input side and/or the inductor on the signal output side can be switched to adjust the center frequency of the tunable filter; the controller is connected to the first variable capacitor and the second variable capacitor through the D/a converter, and adjusts the capacitances of the first variable capacitor and the second variable capacitor by adjusting the voltage of the D/a converter, thereby adjusting the center frequency of the first tunable filter and/or the second tunable filter. And the first variable capacitor and the second variable capacitor can adopt voltage-controlled variable capacitors.
In a more specific embodiment, the inductive switching switch includes a first switch, a second switch, a third switch, and a fourth switch; two ends of a plurality of inductors on the signal input side are respectively connected with a plurality of output ends of a first switch and a plurality of input ends of a second switch, the input end of the first switch is connected with one output end of the first path switcher, and the output end of the second switch is connected with the first variable capacitor; the output end of the first variable capacitor is connected with the input end of the second variable capacitor; two ends of the inductors on the signal output side are respectively connected with a plurality of output ends of the third switch and a plurality of input ends of the fourth switch, and the input end of the third switch is connected with the output end of the second variable capacitor.
Fig. 3 is a block diagram of a tunable filter shown in the present application according to an exemplary embodiment, in which three switchable inductors, namely a first inductor 302, a second inductor 303 and a third inductor 304, are provided at a signal input side; three switchable inductors are arranged on the signal output side, namely a fourth inductor 308, a fifth inductor 309 and a sixth inductor 310; the inductive switches are SP3T switches, namely, a first SP3T switch 301, a second SP3T switch 305, a third SP3T switch 311, and a fourth SP3T switch 312.
As shown in fig. 3, the input terminals of the first inductor 302, the second inductor 303 and the third inductor 304 are respectively connected with three output terminals of the first SP3T switch 301, and the output terminals are respectively connected with three input terminals of the second SP3T switch 305; the input of the first variable capacitor 306 is connected to the output of the second SP3T switch 305 and thus to the first inductor 302, the second inductor 303, or the third inductor 304; the input end of the second variable capacitor 307 is connected with the output end of the first variable capacitor 306, and the line between the second variable capacitor 307 and the first variable capacitor 306 is grounded through fixed capacitance or fixed inductance; the input terminals of the fourth inductor 308, the fifth inductor 309 and the sixth inductor 310 are connected to three output terminals of the third SP3T switch 311, respectively, and the output terminals are connected to three input terminals of the fourth SP3T switch 312, respectively.
The controller 280 is connected to the first variable capacitor 307 and the first variable capacitor 306 through the D/a converter 290, so that the input voltages of the first variable capacitor 307 and the first variable capacitor 306 are adjusted according to the output signal of the a/D converter 270 to change the capacitances of the second variable capacitor 307 and the first variable capacitor 306. The controller 280 is connected to the first SP3T switch 301, the second SP3T switch 305, the third SP3T switch 311, and the fourth SP3T switch 312, respectively, and controls the first SP3T switch 301 and the second SP3T switch 305 to switch one of the first inductor 302, the second inductor 303, and the third inductor 304 into the signal processing path, and controls the third SP3T switch 311 and the fourth SP3T switch 312 to switch one of the fourth inductor 308, the fifth inductor 309, and the sixth inductor 310 into the signal processing path.
Based on the structural design of the tunable filter provided by the application, the controller 280 judges whether frequency point interference occurs according to the received ADC signal, and if it is judged that interference occurs at a certain frequency point, the DAC voltage in the tunable filter, that is, the voltage of the D/a converter 290, can be adjusted, so as to adjust the center frequency of the tunable filter, and filter the interference at the frequency point.
For example, fig. 4 shows the results of a practical simulation of the tunable filter, and it can be seen that when a voltage of 0V is applied, the capacitance CC01 is 32pF, the center frequency is about 20MHz, and the frequency corresponding to 6dB point of the lower sideband is about 16.5MHz, and the frequency corresponding to 6dB point of the upper sideband is about 22.5 MHz. When a voltage of 3V is applied, the capacitance is 16pF, the center frequency is about 27MHz, the frequency corresponding to the 6dB point of the lower sideband is about 29.59MHz, and the frequency corresponding to the 6dB point of the upper sideband is about 24.5 MHz. For example, if there is an interference signal at 20MHz, when a voltage of 0V is applied to the voltage-controlled variable capacitor, the center frequency of the tunable filter is at 20MHz, and the interference signal cannot be filtered. The applied voltage of the voltage controlled variable capacitor can be adjusted to 3V, when its capacitance is 16pF, and the center frequency of the filter has been adjusted to 27MHz, when it is known from fig. 4 that about 21dB attenuation can be generated for the signal at 20 MHz. If the characteristics of the two tunable filters are designed to be the same, the two tunable filters can produce 21dB attenuation twice for the interference at 20MHz, i.e. 42dB attenuation, and can effectively filter out any interference in the band.
It should be understood that fig. 3 is only an exemplary composition of the tunable filter of the present application, and those skilled in the art can obtain other examples of the tunable filter of the present application without creative efforts based on the example shown in fig. 3, and all of them belong to the protection scope of the present application. For example, the number of inductors provided on the signal input side is not limited to 3, and may be 2 or 4, and similarly, the number of inductors provided on the signal output side is not limited to 3 and may be the same as the number of inductors on the signal input side, and may be other numbers. Accordingly, the switch for connecting either one of the inductors of the signal input side and the signal output side to the signal processing path is not limited to the SP3T switch.
It should be noted that the second variable capacitor 307 and the first variable capacitor 306 may be variable capacitors of the same type, or may be variable capacitors of different types. The voltages applied to the second variable capacitor 307 and the first variable capacitor 306 may be the same voltage or may be different voltages controlled independently.
According to the embodiment, the tunable filter is simple in structure and easy to implement. The center frequency of the filter can be adjusted by switching the inductors on the signal input side and the signal output side and changing the capacitances of the second variable capacitor 307 and the first variable capacitor 306, and is easily controlled, and the center frequency thereof is adjustable between 3MHz and 30 MHz.
It should be understood that through a large number of experiments and tests, the corresponding relationship between the center frequency and the inductor scheme, i.e., the combination scheme of the inductor selected on the signal input side and the inductor selected on the signal output side, and the corresponding relationship between the center frequency and the capacitor voltage parameters, i.e., the parameter corresponding to the first variable capacitor and the parameter corresponding to the second variable capacitor, can be obtained.
It can be seen from the above embodiments that, in the high-frequency partial discharge signal detection system provided in the embodiment of the present application, the system can control to enable the first path or the second path according to the amplitude of the signal to be detected, and when the amplitude of the signal to be detected is higher than the preset value, the first path is enabled, so that the signal to be detected is directly output to the a/D converter, thereby avoiding the loss of the large-amplitude discharge signal, and when the amplitude of the signal to be detected is not higher than the preset value, the second path is enabled, that is, the signal to be detected is subjected to low-noise amplification processing through the second path, thereby ensuring the capture of the small signal. Therefore, the high-frequency partial discharge signal detection system provided by the embodiment of the application has a large dynamic range.
The embodiment of the present application further provides a method for detecting a high-frequency partial discharge signal, which is applied to the high-frequency partial discharge signal detection system provided in the embodiment of the present application, for example, a program for executing the method may be configured in the controller 280, so that the controller 280 executes the method according to the program corresponding to the method. Fig. 5 is a flowchart illustrating a control method for detecting a high-frequency partial discharge signal according to an exemplary embodiment of the present application, and as shown in fig. 5, the method may include:
Referring to fig. 2, the high-frequency current sensor receives the initial signal and transmits the initial signal to the first tunable filter, and the first tunable filter performs a first-stage filtering process on the initial partial discharge signal to obtain a signal to be detected.
And 530, if the amplitude of the signal to be detected is greater than a preset value, transmitting the signal to be detected to a first channel, and directly transmitting the signal to be detected to an A/D converter through the first channel.
And 540, if the amplitude of the signal to be detected is not greater than a preset value, transmitting the signal to be detected to a second channel, performing low-noise amplification processing on the signal to be detected through the second channel, and transmitting the processed signal to an A/D converter.
In addition, when the signal output by the second channel reaches a saturation state after being processed by the A/D converter, the signal to be detected is transmitted to the first channel and is directly transmitted to the A/D converter through the first channel.
Therefore, the high-frequency partial discharge signal detection method provided by the application can not lose large-amplitude discharge signals and can capture small discharge signals through the large-amplitude signal bypass LNA.
As shown in fig. 2, the second path includes a second tunable filter, the first tunable filter and the second tunable filter in the second path are connected to a D/a converter, and the center frequencies of the second tunable filter and the first tunable filter are adjustable. In the process of detecting the high-frequency partial discharge signal, when the frequency point interference occurs in the output signal of the A/D converter, the central frequency of the first adjustable filter and/or the second adjustable filter is adjusted by adjusting the voltage of the connected D/A converter, so that the frequency point interference is filtered.
It should be noted that, in the method embodiment, the low-noise amplification processing process of the signal to be detected by the second path, the structural design of the second path, and the relation between the structures of the first tunable filter and the second tunable filter may all be referred to the foregoing detection system embodiment, and details are not described here.
It should be further noted that the method for detecting a frequency partial discharge signal provided in this embodiment of the present application may include some or all steps executed by the controller 280 in the embodiment of the system, and may also include a step of processing a signal by any device in the system, which is not described herein again.
In specific implementation, the present invention further provides a computer storage medium, where the computer storage medium may store a program, and the program may include some or all of the steps in each embodiment of the high-frequency partial discharge signal detection method provided by the present invention when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will readily appreciate that the techniques of the embodiments of the present invention may be implemented as software plus a required general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, for the embodiments, since they are substantially similar to the method embodiments, the description is simple, and the relevant points can be referred to the description in the method embodiments.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention.
Claims (12)
1. A high frequency partial discharge signal detection system, comprising: a controller, a first path, a second path, a path switcher and an A/D converter;
the controller is connected with the access switcher and used for judging the amplitude of the signal to be detected; when the amplitude of the signal to be detected is judged to be larger than a preset value, controlling the path switcher to be switched on to the first path so as to directly convey the signal to be detected to the A/D converter through the first path; when the amplitude of the signal to be detected is judged to be not larger than a preset value, controlling the path switcher to be switched on to the second path so as to convey the signal to be detected to the second path and convey the signal processed by the second path to the A/D converter;
the second channel is used for carrying out low-noise amplification processing on the signal to be detected;
the controller is also connected with the output end of the A/D converter and is used for detecting the partial discharge signal according to the signal output by the A/D converter.
2. The system of claim 1, further comprising: a high frequency current sensor and a first tunable filter;
the high-frequency current sensor is connected with the first adjustable filter and used for acquiring an initial partial discharge signal and sending the initial signal to the first adjustable filter;
the first adjustable filter is connected with the access switcher and used for performing first filtering processing on the initial partial discharge signal to obtain a signal to be detected and transmitting the signal to be detected to the access switcher.
3. The system of claim 2, wherein the second path comprises a second tunable filter, the system further comprising a D/a converter coupled to the first tunable filter and the second tunable filter;
the controller is also connected with the D/A converter and is used for adjusting the central frequency of the first adjustable filter and/or the second adjustable filter and filtering out frequency point interference by adjusting the voltage of the D/A converter when the frequency point interference occurs in the signal output by the A/D converter.
4. The system of claim 3, wherein the first tunable filter and the second tunable filter each comprise: a plurality of inductors, a first variable capacitor, a second variable capacitor, a plurality of inductors, and an inductance changeover switch, which are provided on a signal input side;
the controller is connected with the inductance switch and is further used for switching an inductor on a signal input side and/or an inductor on a signal output side by controlling the inductance switch so as to adjust the center frequencies of the first tunable filter and the second tunable filter;
the controller is connected with the first variable capacitor and the second variable capacitor through the D/A converter and is further used for adjusting the capacitance of the first variable capacitor and the second variable capacitor through adjusting the voltage of the D/A converter so as to adjust the center frequency of the first adjustable filter and/or the second adjustable filter.
5. The system of claim 3, wherein the second path further comprises: a first amplifier, a second amplifier, a first low-pass filter, a third amplifier and a second low-pass filter;
the first amplifier is connected with the access switcher and is used for carrying out first-stage amplification processing on the signal to be detected and transmitting the signal subjected to the first-stage amplification processing to the second adjustable filter;
the second amplifier is connected with the second tunable filter and used for performing second-stage amplification processing on the output signal of the second tunable filter and transmitting the signal after the second-stage amplification processing to the first low-pass filter;
the first low-pass filter is connected with the first amplifier and is used for performing first-stage low-pass filtering processing on the signal subjected to the second-stage amplification processing and transmitting the first-stage low-pass filtering processing to the third amplifier;
the third amplifier is connected with the first low-pass filter and used for performing third-stage amplification processing on the signal subjected to the first-stage low-pass filtering processing and outputting the signal subjected to the third-stage amplification processing to the second low-pass filter;
and the second low-pass filter is connected with the third amplifier and is used for performing second-stage low-pass filtering processing on the signal subjected to the third-stage amplification processing and transmitting the signal subjected to the second-stage low-pass filtering processing to the A/D converter.
6. The system of claim 5, wherein the path switch comprises a first path switch and a second path switch;
the first path switcher comprises two output ends, the two output ends are respectively connected with the first amplifiers in the first path and the second path, and the input end of the first path switcher is connected with the output end of the first adjustable filter;
the second path switch comprises two input ends, the two input ends are respectively connected with the second low-pass filters in the first path and the second path, and the output end of the second path switch is connected with the A/D converter.
7. The system of claim 4, wherein the inductive switching switch comprises a first switch, a second switch, a third switch, and a fourth switch;
both ends of the plurality of inductors on the signal input side are connected to a plurality of output ends of the first switch and a plurality of input ends of the second switch, respectively, an input end of the first switch is connected to the path switcher, and an output end of the second switch is connected to the first variable capacitor;
the output end of the first variable capacitor is connected with the input end of the second variable capacitor;
both ends of the plurality of inductors on the signal output side are connected to a plurality of output ends of the third switch and a plurality of input ends of the fourth switch, respectively, and an input end of the third switch is connected to an output end of the second variable capacitor.
8. The system of any one of claims 1-7, wherein the controller is further configured to: and when the signal processed by the second path and output by the A/D converter is confirmed to be in a saturated state, controlling the switching circuit to be switched to the first path, and transmitting the detection signal to be detected to the A/D converter through the first path.
9. A control method for detecting a high frequency partial discharge signal, applied to the system of claim 1, the method comprising:
acquiring a signal to be detected, and judging the amplitude of the signal to be detected;
if the amplitude of the signal to be detected is larger than a preset value, the signal to be detected is transmitted to a first channel, and the signal to be detected is directly transmitted to an A/D converter through the first channel;
if the amplitude of the signal to be detected is not larger than a preset value, the signal to be detected is transmitted to a second channel, low-noise amplification processing is carried out on the signal to be detected through the second channel, and the processed signal is transmitted to an A/D converter;
and detecting a partial discharge signal according to the signal output by the A/D converter.
10. The method of claim 9, wherein the acquiring the signal to be detected comprises:
acquiring an initial partial discharge signal through a high-frequency current sensor;
and carrying out first-stage filtering processing on the initial partial discharge signal through a first adjustable filter to obtain the signal to be detected.
11. The method of claim 10, wherein the second path comprises a second tunable filter, and wherein a D/a converter is connected to the second tunable filter of the first and second paths; the method further comprises the following steps:
when the frequency point interference occurs in the output signal of the A/D converter, the central frequency of the first adjustable filter and/or the second adjustable filter is adjusted by adjusting the voltage of the connected D/A converter, so that the frequency point interference is filtered.
12. The method of claim 9, further comprising:
when the signal output by the second channel reaches a saturation state after being processed by the A/D converter, the signal to be detected is transmitted to the first channel and is directly transmitted to the A/D converter through the first channel.
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