CN113848434A - Interference source measuring method and system for on-site partial discharge - Google Patents
Interference source measuring method and system for on-site partial discharge Download PDFInfo
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- CN113848434A CN113848434A CN202110922303.9A CN202110922303A CN113848434A CN 113848434 A CN113848434 A CN 113848434A CN 202110922303 A CN202110922303 A CN 202110922303A CN 113848434 A CN113848434 A CN 113848434A
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
Abstract
The invention provides a method and a system for measuring an interference source of on-site partial discharge, wherein the method comprises the steps of collecting electromagnetic wave signals of a detection point, and carrying out background interference elimination processing through a channel conditioning module; the high-speed data acquisition device respectively stores the electromagnetic wave signals with the background interference eliminated according to a specified format and respectively transmits the electromagnetic wave signals to the background analysis positioning device through different channels; the background analysis positioning device analyzes the received electromagnetic wave signals, calculates the position of a signal source of each electromagnetic wave signal of each channel and obtains the three-dimensional space coordinate of each signal source; and eliminating the signal source of the high-voltage end to be detected, and marking the rest signal sources as interference sources. Compared with the prior art, the method can accurately position the position of the interference source in a shorter time and improve the efficiency of the partial discharge test.
Description
Technical Field
The invention relates to the field of test and detection of power equipment, in particular to a method and a system for measuring an interference source of on-site partial discharge.
Background
Partial discharge is considered as one of important indexes for assessing the insulation condition of power equipment. According to the GB50150, partial discharge tests should be carried out on power transformers in the field handover stage, after the transformer is repaired and replaced by insulating parts or partial windings of 220kV and above, and if necessary (such as when the oil chromatography is abnormal and the existence of discharge faults is suspected in operation). Therefore, the insulation condition diagnosis through the partial discharge test plays an important role in the stages of transformer handover, operation and the like.
The local discharge test is inevitably interfered by the environment, instruments and the like. The external interference mainly includes power supply interference, ground interference, electromagnetic radiation interference, floating potential discharge interference, corona discharge interference, interference of each connection contact discharge, and the like. Because the external part of the test article generates interference discharge, the partial discharge measurement system is connected in series with external interference signals, and the following problems can be caused:
1) the form and the phase position of the external discharge pulse are very similar to the internal partial discharge characteristics of the test sample, and are difficult to distinguish in the partial discharge test process;
2) although the interference discharge type has a typical map, the field environment is complex, and the superposition of various maps causes confusion of judgment of personnel.
When interference occurs in a partial discharge test, the existing mode is that a professional technician judges and eliminates the interference item by item, and the interference source of some interference signals is difficult to find, so that the judgment of a test result is difficult, and the elimination of the interference wastes a large amount of test time. And the correctness of the judgment of the interference signal depends on the experience of the tester to a large extent. At present, the interference is eliminated by methods such as windowing and filtering, the anti-interference function is single, the interference is eliminated passively by the method, the external interference cannot be eliminated, and the local discharge instrument cannot identify whether the received pulse signal comes from the inside or the outside of the transformer, so that the interference source is found and the interference elimination is combined with the local discharge instrument, which is very important for improving the test accuracy.
Disclosure of Invention
The invention aims to provide a method and a system for measuring an interference source of on-site partial discharge, which can solve the problems of difficulty in identifying the interference source and more time consumption in the prior art.
The purpose of the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a method for measuring an interference source of an on-site partial discharge, including the following steps:
collecting electromagnetic wave signals of a detection point, and carrying out background interference elimination processing through a channel conditioning module;
the high-speed data acquisition device respectively stores the electromagnetic wave signals with the background interference eliminated according to a specified format and respectively transmits the electromagnetic wave signals to the background analysis positioning device through different channels;
the background analysis positioning device analyzes the received electromagnetic wave signals, calculates the position of a signal source of each electromagnetic wave signal of each channel and obtains the three-dimensional space coordinate of each signal source;
and eliminating the signal source of the high-voltage end to be detected, and marking the rest signal sources as interference sources.
Further, the method for measuring the interference source of the on-site partial discharge further comprises the following steps: and imaging the position of the interference source by a camera and displaying the imaged interference source on a background analysis device interface.
Furthermore, the collection of the electromagnetic wave signals at the detection point is completed by an antenna array consisting of at least 4 receiving antennas.
Furthermore, the background interference elimination processing is completed through the channel conditioning module, firstly, the filtering unit of the channel conditioning module filters electromagnetic wave signals outside the selected frequency band according to the selected filtering frequency band, and then the amplifying unit amplifies the electromagnetic wave signals filtered by the filtering unit.
Further, the equation system for calculating the signal source position of each electromagnetic wave signal of each channel is as follows:
dithe distance from the signal source to the ith antenna,
c is the electromagnetic wave propagation speed;
t1ithe time difference between the time when the 1 st antenna receives the partial discharge signal and the time when the ith antenna receives the partial discharge signal is obtained through time delay estimation.
In a second aspect, the present invention provides an interference source measurement system for on-site partial discharge, including an antenna array, a channel conditioning module, a high-speed data acquisition device, and a background analysis positioning device, wherein:
the antenna array comprises at least 4 receiving antennas, and each receiving antenna is provided with a measuring sensor;
the channel conditioning module comprises a filtering unit and an amplifying unit which are sequentially connected, the filtering unit is used for filtering the electromagnetic wave signals received by the channel conditioning module, and the amplifying unit is used for amplifying the electromagnetic wave signals subjected to filtering;
the high-speed data acquisition device is provided with 4 high-speed acquisition and storage channels, each acquisition and storage channel comprises a high-speed AD converter, a super-large-scale FPGA and an FIFO memory which are sequentially connected, the high-speed AD converter performs analog-to-digital conversion on a signal sent by the channel conditioning module and then processes the signal into a specified format through the FPGA, and the FIFO memory stores the signal in the specified format and then sends the signal to the background analysis positioning device;
and the background analysis positioning device is used for analyzing the received electromagnetic wave signals, calculating the position of the signal source of each electromagnetic wave signal of each channel, obtaining the three-dimensional space coordinate of each signal source and marking the position of the interference source.
Furthermore, the system for measuring the on-site partial discharge interference source further comprises a wireless control camera, and after the background analysis positioning device marks the position of the interference source, the background analysis positioning device shoots a picture of the interference source and sends the picture to the background analysis positioning device for displaying.
Furthermore, the amplifying unit is composed of three stages of amplifying circuits, wherein the gain of each stage of amplifying circuit is not lower than 20dB, and the overall gain of the amplifying unit is not lower than 60 dB.
According to the method and the system for measuring the interference source of the on-site partial discharge, the position of the interference source is calculated by utilizing the time difference and the space geometric relation of the partial discharge signals after the partial discharge signals are received by the plurality of array antennas. Compared with the prior art, the method can accurately position the position of the interference source in a shorter time and improve the efficiency of the partial discharge test.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method of measuring an interference source for in-situ partial discharge according to the present invention;
FIG. 2 is a block diagram of the in-situ partial discharge interference source measurement system of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The invention relates to a method for measuring an interference source of on-site partial discharge, which comprises the following steps as shown in a flow chart of figure 1:
and step S1, collecting the electromagnetic wave signals at the detection points, and performing background interference elimination processing through a channel conditioning module.
The electromagnetic wave signals collected in this step include partial discharge signals to be detected (hereinafter referred to as partial discharge signals) and interference signals emitted by an external interference source. The invention collects the electromagnetic wave signal of the detection point through an antenna array composed of at least 4 receiving antennas. Electromagnetic waves generated by electromagnetic disturbance generated by partial discharge along with time change follow the basic equation of electromagnetic field of Maxwell, so that the antenna can be used for receiving high-frequency electromagnetic waves generated by partial discharge to determine the position of a partial discharge source. When the positions of a transmitting source (namely an interference source, also called an partial discharge source) and a detection point of a partial discharge signal are determined, the propagation time of the electromagnetic wave signal generated by the partial discharge from the partial discharge source to the detection point is also determined, so that an antenna array can be formed by a plurality of receiving antennas to receive the partial discharge signal transmitted by each partial discharge source.
Furthermore, the background interference elimination processing is completed through the channel conditioning module, firstly, the filtering unit of the channel conditioning module filters electromagnetic wave signals outside the selected frequency band according to the selected filtering frequency band, and then the amplifying unit amplifies the electromagnetic wave signals filtered by the filtering unit. The amplifying unit is composed of a preposed broadband amplifier, the amplifier is composed of three stages of amplifying circuits, wherein the gain of each stage of amplifying circuit is not lower than 20dB, and the total realization of three stages of fixed gains is not lower than 60 dB.
And step S2, the high-speed data acquisition device respectively stores the electromagnetic wave signals with the background interference eliminated according to a specified format, and respectively transmits the electromagnetic wave signals to the background analysis positioning device through different channels.
High-speed data acquisition device can guarantee synchronous collection, has 4 high-speed collection memory channel of way, and every way collection memory channel includes: high-speed AD converter, super large-scale FPGA and FIFO memory. The high-speed acquisition device is provided with an Intel high-speed processor, is provided with communication interfaces such as Ethernet and RS232, and can transmit data to the background analysis system through the Ethernet.
The user can also utilize the high-speed oscilloscope to collect data and transmit the data to the background analysis system through TCP/IP.
And step S3, the background analysis positioning device analyzes the received electromagnetic wave signals, calculates the position of the signal source of each electromagnetic wave signal of each channel, and obtains the three-dimensional space coordinates of each signal source.
The background analysis positioning device utilizes a digital filtering technology to inhibit background interference, obtains the time difference of each channel signal by analyzing data, and calculates the space position of an interference source. The background data analysis function mainly comprises partial discharge signal identification and classification, time delay self-adaptive compensation, positioning calculation and the like. And finally determining the three-dimensional space coordinate of the partial discharge source by the system through optimization calculation.
Ultrahigh-frequency band electromagnetic wave signals are uniformly transmitted in a uniform medium, and the discharge source is positioned by processing the arrival time delay of signals received by more than 4 measuring sensors based on the minimum optical path difference principle. The visible partial discharge UHF space positioning system adopts 4 UHF antenna arrays, and the moment when a partial discharge signal is supposed to be transmitted to the ith antenna from a certain point of the power transmission and transformation equipment is marked as tiI is 1, 2, …, n, and the ith antenna is setHas a three-dimensional coordinate of (x)i，yi，zi) The three-dimensional coordinate of the partial discharge source is (x)s，ys，zs) The difference between the time when the 1 st antenna receives the partial discharge signal and the time when the ith antenna receives the partial discharge signal is t1iWhere i is 2, …, n, from the spatial geometry analysis, it can be seen that:
wherein d isiThe distance from the signal source to the ith antenna,
and c is the electromagnetic wave propagation speed. Deriving t by time delay estimation1iThe position (x) of the partial discharge source can be determined by any 3 equationss，ys，zs) And the detection accuracy can be effectively improved by a plurality of equations.
And S4, eliminating the signal source of the high-voltage end to be detected, and marking the rest signal sources as interference sources.
The electromagnetic wave signals received by the antenna array include signals of the high-voltage end to be detected and interference signals of other interference sources, and according to the three-dimensional coordinates of each signal source calculated in the step S3, the three-dimensional coordinates of the high-voltage end are known, the three-dimensional coordinates of the high-voltage end are excluded, and the remaining signal sources are determined as the interference sources.
Preferably, the method for measuring an interference source of an on-site partial discharge further includes the following steps: and imaging the position of the interference source through a camera, and displaying on a background analysis device interface.
The invention also provides an interference source measuring system for on-site partial discharge, as shown in fig. 2, comprising an antenna array, a channel conditioning module, a high-speed data acquisition device and a background analysis positioning device, wherein:
the antenna array comprises at least 4 receiving antennas, and each receiving antenna is provided with a measuring sensor. The measuring sensor is used for receiving the electromagnetic wave signals transmitted by each signal source and transmitting the electromagnetic wave signals to the channel conditioning module.
The channel conditioning module comprises a filtering unit and an amplifying unit which are sequentially connected, wherein the filtering unit is used for filtering the electromagnetic wave signals received by the channel conditioning module, and generally filtering the electromagnetic wave signals outside a selected frequency band; the amplifying unit amplifies the filtered electromagnetic wave signal. The amplifying unit is composed of a preposed broadband amplifier, the amplifier is composed of three stages of amplifying circuits, wherein the gain of each stage of amplifying circuit is not lower than 20dB, and the total realization of three stages of fixed gains is not lower than 60 dB.
The high-speed data acquisition device is provided with 4 high-speed acquisition and storage channels, each acquisition and storage channel comprises a high-speed AD converter, a super-large-scale FPGA and an FIFO memory which are sequentially connected, the high-speed AD converter performs analog-to-digital conversion on signals sent by the channel conditioning module and then processes the signals into a specified format through the FPGA, and the FIFO memory stores the signals in the specified format and then sends the signals to the background analysis positioning device.
And the background analysis positioning device is used for analyzing the received electromagnetic wave signals, calculating the position of the signal source of each electromagnetic wave signal of each channel, obtaining the three-dimensional space coordinate of each signal source and marking the position of the interference source.
Preferably, the system for measuring the interference source of the on-site partial discharge further comprises a wireless control camera, and when the background analysis positioning device marks the position of the interference source, the background analysis positioning device takes a picture of the interference source and sends the picture to the background analysis positioning device for displaying.
The interference source measuring system of the on-site partial discharge has the main functions of:
(1) the system can provide a friendly man-machine interface, and a user can conveniently check related information and configuration parameters according to needs.
(2) The device can synchronously acquire external partial discharge signals and has multiple acquisition trigger modes.
(3) The high-power high-voltage power supply has extremely high electromagnetic compatibility and anti-interference capability, is provided with analog and digital mixed filtering functions, and realizes the recognition of external discharge and space interference in a strong interference environment.
(4) The antenna array is formed by a plurality of receiving antennas, and the position of the partial discharge source is calculated according to the time difference and the space geometric relation of the partial discharge signals received by each antenna.
(5) The discharge pulse can be captured, expanded and analyzed in pulse spectrum characteristics and discharge pulse properties.
(6) The test data and waveforms are saved automatically or manually, and the test records saved in the past can be displayed and analyzed again.
(7) The position picture of the interference source and the detection data result can be saved, and the detection report can be automatically generated.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.
Claims (8)
1. An interference source measuring method for on-site partial discharge is characterized by comprising the following steps:
collecting electromagnetic wave signals of a detection point, and carrying out background interference elimination processing through a channel conditioning module;
the high-speed data acquisition device respectively stores the electromagnetic wave signals with the background interference eliminated according to a specified format and respectively transmits the electromagnetic wave signals to the background analysis positioning device through different channels;
the background analysis positioning device analyzes the received electromagnetic wave signals, calculates the position of a signal source of each electromagnetic wave signal of each channel and obtains the three-dimensional space coordinate of each signal source;
and eliminating the signal source of the high-voltage end to be detected, and marking the rest signal sources as interference sources.
2. The method for measuring the interference source of the in-situ partial discharge according to claim 1, further comprising the steps of: and imaging the position of the interference source by a camera and displaying the imaged interference source on a background analysis device interface.
3. The method as claimed in claim 1 or 2, wherein the collection of the electromagnetic wave signals at the detection point is performed by an antenna array consisting of at least 4 receiving antennas.
4. The method for measuring the interference source of the on-site partial discharge according to claim 1 or 2, wherein the background interference elimination processing is completed by a channel conditioning module, firstly, a filtering unit of the channel conditioning module filters electromagnetic wave signals outside a selected frequency band according to the selected filtering frequency band, and then, an amplifying unit amplifies the electromagnetic wave signals filtered by the filtering unit.
5. The method for measuring the interference source of the in-situ partial discharge according to claim 1 or 2, wherein the equation for calculating the position of the signal source of each electromagnetic wave signal of each channel is as follows:
dithe distance from the signal source to the ith antenna,
c is the electromagnetic wave propagation speed;
t1ithe time difference between the time when the 1 st antenna receives the partial discharge signal and the time when the ith antenna receives the partial discharge signal is obtained through time delay estimation.
6. The utility model provides an interference source measurement system of on-spot partial discharge which characterized in that, includes antenna array, passageway conditioning module, high-speed data acquisition device and backstage analysis positioner, wherein:
the antenna array comprises at least 4 receiving antennas, and each receiving antenna is provided with a measuring sensor;
the channel conditioning module comprises a filtering unit and an amplifying unit which are sequentially connected, the filtering unit is used for filtering the electromagnetic wave signals received by the channel conditioning module, and the amplifying unit is used for amplifying the electromagnetic wave signals subjected to filtering;
the high-speed data acquisition device is provided with 4 high-speed acquisition and storage channels, each acquisition and storage channel comprises a high-speed AD converter, a super-large-scale FPGA and an FIFO memory which are sequentially connected, the high-speed AD converter performs analog-to-digital conversion on a signal sent by the channel conditioning module and then processes the signal into a specified format through the FPGA, and the FIFO memory stores the signal in the specified format and then sends the signal to the background analysis positioning device;
and the background analysis positioning device is used for analyzing the received electromagnetic wave signals, calculating the position of the signal source of each electromagnetic wave signal of each channel, obtaining the three-dimensional space coordinate of each signal source and marking the position of the interference source.
7. The system of claim 6, further comprising a wireless control camera, wherein when the background analysis positioning device marks the position of the interference source, the background analysis positioning device takes a picture of the interference source and sends the picture to the background analysis positioning device for displaying.
8. The in-situ partial discharge interference source measurement system according to claim 6, wherein the amplification unit is composed of three stages of amplification circuits, wherein the gain of each stage of amplification circuit is not lower than 20dB, and the overall gain of the amplification unit is not lower than 60 dB.
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