阅读说明：本技术 一种高频局部放电抗干扰功能校验方法及系统 (High-frequency partial discharge anti-interference function verification method and system ) 是由 何宁辉 吴旭涛 亓亮 沙伟燕 刘世涛 李秀广 马波 谢正宁 魏莹 伍弘 于 2020-06-11 设计创作，主要内容包括：本申请公开一种高频局部放电抗干扰功能校验方法及系统。所述方法包括控制计算机读取将预存的高频放电及高频电磁干扰样本库中的样本数据传输至可编程脉冲序列发生装置；可编程脉冲序列发生装置根据样本数据生成高频局放脉冲信号和各类干扰信号；待测高频局部放电检测仪器通过卡在干扰信号和局放脉冲信号输出通路接线上的传感器,依据模式识别程序得到检测结果,将检测结果回传至控制计算机；控制计算机读取待测高频局部放电检测仪器的检测结果,通过比对检测结果和实际发出的局部放电类型,自动评价待测高频局部放电检测仪器的高频局部放电抗干扰功能并生成检测报告。实现对高频局部放电检测仪器抗干扰功能的校验,提高高频局放仪器的检测水平。(The application discloses a high-frequency partial discharge anti-interference function checking method and system. The method comprises the steps that a control computer reads sample data in a prestored high-frequency discharge and high-frequency electromagnetic interference sample library and transmits the sample data to a programmable pulse sequence generating device; the programmable pulse sequence generating device generates a high-frequency partial discharge pulse signal and various interference signals according to the sample data; the high-frequency partial discharge detector to be detected obtains a detection result according to a mode identification program through a sensor clamped on a wiring of an interference signal and a partial discharge pulse signal output channel, and the detection result is transmitted back to the control computer; and the control computer reads the detection result of the high-frequency partial discharge detection instrument to be detected, and automatically evaluates the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected and generates a detection report by comparing the detection result with the actually emitted partial discharge type. The anti-interference function of the high-frequency partial discharge detector is verified, and the detection level of the high-frequency partial discharge detector is improved.)

1. A high-frequency partial discharge anti-interference function verification method is characterized by comprising the following steps:

the control computer reads and transmits the sample data in the pre-stored high-frequency discharge and high-frequency electromagnetic interference sample library to the programmable pulse sequence generating device;

the programmable pulse sequence generating device generates a high-frequency partial discharge pulse signal and various interference signals according to the sample data;

the high-frequency partial discharge detector to be detected obtains a detection result according to a mode identification program through a sensor clamped on a wiring of an interference signal and a partial discharge pulse signal output channel, and the detection result is transmitted back to the control computer;

and the control computer reads the detection result of the high-frequency partial discharge detection instrument to be detected, and automatically evaluates the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected and generates a detection report by comparing the detection result with the actually emitted partial discharge type.

2. The method for verifying anti-interference function of high-frequency partial discharge according to claim 1, wherein the anti-interference function of high-frequency partial discharge of the high-frequency partial discharge detector to be tested is automatically evaluated, specifically, the signal-to-noise ratio of the partial discharge signal and the interference signal is calculated, and the anti-interference function of high-frequency partial discharge of the high-frequency partial discharge detector to be tested is evaluated according to a pre-established assessment grade based on the signal-to-noise ratio.

3. The method for verifying anti-interference function of high-frequency partial discharge according to claim 2, wherein the evaluation level based on the signal-to-noise ratio comprises:

stage I: the signal-to-noise ratio SNR is approximately equal to 1:0.5, and the characteristic is that the partial discharge signal is slightly higher than the interference signal level, a useful signal can be extracted by adjusting a threshold value, but the situation of the distortion of a partial discharge signal spectrum is caused by increasing the threshold value;

II stage: the signal-to-noise ratio SNR is approximately equal to 1:1, and the characteristic is that the level of a partial discharge signal is equivalent to that of an interference signal, and the situation that a useful signal is difficult to extract through threshold setting is represented;

grade III: the SNR is less than or equal to 1:2, which represents the situation that the local amplification signal is completely submerged by the interference signal in amplitude and the detection can not be normally implemented without adopting a targeted anti-interference measure.

4. The method according to claim 3, wherein the partial discharge signal output channel of the programmable pulse sequence generator is connected to an injection capacitor path, and the interference signal output channel is connected to a resistance matching path;

after the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected is evaluated, the output level of each channel of the programmable pulse sequence generation device is respectively adjusted according to the evaluation grade based on the signal-to-noise ratio and the engineering factor error.

5. The method for verifying the anti-interference function of the high-frequency partial discharge detector as claimed in claim 3, wherein a scoring model for evaluating the anti-interference performance of the high-frequency partial discharge detector to be detected is constructed based on the evaluation level of the signal-to-noise ratio:

Score＝100×e^-k·SNR

wherein, the Score is the Score of the anti-interference capability of the high-frequency partial discharge detector to be detected, the SNR is the ratio of the amplitude of the partial discharge signal inside the device to the amplitude of the interference signal, and k is a correction factor of fitting.

6. The method for verifying the anti-interference function of the high-frequency partial discharge according to claim 5, wherein the signal-to-noise ratio (SNR) is 2, the anti-interference performance Score (Score) is 60, and the fitted correction factor k is 0.255;

calculating according to a grading model to obtain: when the signal-to-noise ratio SNR is equal to 1, the high-frequency partial discharge detector to be detected is divided into 77 points; when the signal-to-noise ratio SNR is equal to the anti-interference test under the condition of 0.5, the high-frequency partial discharge detector to be tested is divided into 88 points; when the SNR approaches to 0, the score of the high-frequency partial discharge detector to be detected approaches to 100; under the condition of any given narrow-band frequency interference current, the filtering function of the high-frequency partial discharge detection instrument to be detected is allowed to be adjusted, and when the high-frequency partial discharge detection instrument to be detected completely inhibits narrow-band communication interference or regular and random interference through a filtering means, the score is 100.

7. A high-frequency partial discharge anti-interference function verification system, comprising a control computer, a programmable pulse sequence generation device and a high-frequency partial discharge detection instrument to be detected, said high-frequency partial discharge anti-interference function verification system executing the high-frequency partial discharge anti-interference function verification method according to any one of claims 1 to 6.

8. The system according to claim 7, wherein the control computer comprises an automatic comparison and analysis system and a data storage unit, and the data storage unit is provided with a high-frequency partial discharge sample library and a high-frequency electromagnetic interference sample library, wherein the high-frequency partial discharge sample library stores high-frequency discharge samples and the high-frequency electromagnetic interference sample library stores high-frequency electromagnetic interference samples; the automatic comparison analysis system reads the high-frequency partial discharge sample library and the high-frequency electromagnetic interference sample stored in the data storage unit, and transmits data to the programmable pulse sequence generation device through the PCIe module; and after receiving the detection result, automatically evaluating the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected and generating a detection report by comparing the detection result with the actually sent partial discharge type.

9. The high-frequency partial discharge interference rejection function verification system according to claim 8, wherein said programmable pulse sequence generator generates interference signals of all types from all interference types in an established high-frequency electromagnetic interference sample library.

10. The high-frequency partial discharge interference rejection function verification system according to claim 7, wherein said programmable pulse sequence generating means generates a high-frequency partial discharge pulse signal U_PAnd an injection capacitor C₀Generating a high apparent charge Q in the high frequency verification wiring loopFrequency pulse current, and programmable pulse sequence generator for generating various interference signals U via other channels_sAnd is applied to the sensor HFCT to be tested via the resistor Rs.

Technical Field

The application relates to the field of high-frequency partial discharge detection, in particular to a high-frequency partial discharge anti-interference function checking method and system.

Background

For the detection of partial discharge, the anti-interference capability of a detection instrument is very important, and the detection instrument is a necessary premise for ensuring the accuracy of the partial discharge detection. The anti-interference function of most detection instruments can not meet the requirement of field test far away, so that the existing partial discharge detection instrument has a large number of problems of false alarm and missing report.

However, the existing standard is used for checking the anti-interference capability of the partial discharge detector, and an effective quantitative evaluation method and means are not provided, so that an anti-interference function checking platform of the partial discharge detector is urgently needed to be established, and the detection level of the detector is improved.

Disclosure of Invention

The application provides a high-frequency partial discharge anti-interference function checking method, which comprises the following steps:

the control computer reads and transmits the sample data in the pre-stored high-frequency discharge and high-frequency electromagnetic interference sample library to the programmable pulse sequence generating device;

the programmable pulse sequence generating device generates a high-frequency partial discharge pulse signal and various interference signals according to the sample data;

the high-frequency partial discharge detector to be detected obtains a detection result according to a mode identification program through a sensor clamped on a wiring of an interference signal and a partial discharge pulse signal output channel, and the detection result is transmitted back to the control computer;

and the control computer reads the detection result of the high-frequency partial discharge detection instrument to be detected, and automatically evaluates the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected and generates a detection report by comparing the detection result with the actually emitted partial discharge type.

The method for verifying the high-frequency partial discharge anti-interference function comprises the steps of automatically evaluating the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected, specifically calculating the signal-to-noise ratio of a partial discharge signal and an interference signal, and evaluating the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected according to a pre-established assessment grade based on the signal-to-noise ratio.

The method for verifying the anti-interference function of the high-frequency partial discharge comprises the following steps of:

stage I: the signal-to-noise ratio SNR is approximately equal to 1:0.5, and the characteristic is that the partial discharge signal is slightly higher than the interference signal level, a useful signal can be extracted by adjusting a threshold value, but the situation of the distortion of a partial discharge signal spectrum is caused by increasing the threshold value;

II stage: the signal-to-noise ratio SNR is approximately equal to 1:1, and the characteristic is that the level of a partial discharge signal is equivalent to that of an interference signal, and the situation that a useful signal is difficult to extract through threshold setting is represented;

grade III: the SNR is less than or equal to 1:2, which represents the situation that the local amplification signal is completely submerged by the interference signal in amplitude and the detection can not be normally implemented without adopting a targeted anti-interference measure.

The method for checking the high-frequency partial discharge anti-interference function comprises the following steps that a partial discharge signal output channel of a programmable pulse sequence generation device is connected with an injection capacitor channel, and an interference signal output channel is connected with a resistance matching channel;

after the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected is evaluated, the output level of each channel of the programmable pulse sequence generation device is respectively adjusted according to the evaluation grade based on the signal-to-noise ratio and the engineering factor error.

The method for verifying the anti-interference function of the high-frequency partial discharge comprises the following steps of constructing a scoring model for evaluating the anti-interference performance of a high-frequency partial discharge detection instrument to be detected based on the evaluation grade of the signal-to-noise ratio:

Score＝100×e^-k·SNR

wherein, the Score is the Score of the anti-interference capability of the high-frequency partial discharge detector to be detected, the SNR is the ratio of the amplitude of the partial discharge signal inside the device to the amplitude of the interference signal, and k is a correction factor of fitting.

The method for verifying the anti-interference function of the high-frequency partial discharge comprises the following steps of calculating that when the high-frequency partial discharge detector to be detected passes through an I-level interference condition, the signal-to-noise ratio SNR is 2, the anti-interference performance Score is 60, and calculating to obtain a fitted correction factor k which is 0.255;

calculating according to a grading model to obtain: when the signal-to-noise ratio SNR is equal to 1, the high-frequency partial discharge detector to be detected is divided into 77 points; when the signal-to-noise ratio SNR is equal to the anti-interference test under the condition of 0.5, the high-frequency partial discharge detector to be tested is divided into 88 points; when the SNR approaches to 0, the score of the high-frequency partial discharge detector to be detected approaches to 100; under the condition of any given narrow-band frequency interference current, the filtering function of the high-frequency partial discharge detection instrument to be detected is allowed to be adjusted, and when the high-frequency partial discharge detection instrument to be detected completely inhibits narrow-band communication interference or regular and random interference through a filtering means, the score is 100.

The application also provides a high-frequency partial discharge anti-interference function checking system, which comprises a control computer, a programmable pulse sequence generating device and a high-frequency partial discharge detection instrument to be detected, wherein the high-frequency partial discharge anti-interference function checking system executes the high-frequency partial discharge anti-interference function checking method.

The high-frequency partial discharge anti-interference function calibration system comprises a control computer, a high-frequency partial discharge sample library, a high-frequency electromagnetic interference sample library, a high-frequency partial discharge analysis module and a high-frequency electromagnetic interference analysis module, wherein the high-frequency partial discharge sample library stores high-frequency discharge samples and the high-frequency electromagnetic interference sample library stores high-frequency electromagnetic interference samples; the automatic comparison analysis system reads the high-frequency partial discharge sample library and the high-frequency electromagnetic interference sample stored in the data storage unit, and transmits data to the programmable pulse sequence generation device through the PCIe module; and after receiving the detection result, automatically evaluating the high-frequency partial discharge anti-interference function of the high-frequency partial discharge detection instrument to be detected and generating a detection report by comparing the detection result with the actually sent partial discharge type.

The high-frequency partial discharge anti-interference function verification system comprises a programmable pulse sequence generation device, a high-frequency partial discharge anti-interference function verification device and a high-frequency partial discharge anti-interference function verification device, wherein the programmable pulse sequence generation device generates various interference signals from all interference types in an established high-frequency electromagnetic interference sample library.

The high-frequency partial discharge anti-interference function verification system comprises a programmable pulse sequence generating device, a high-frequency partial discharge circuit, a high-frequency calibration circuit and a resistance Rs, wherein the programmable pulse sequence generating device generates a high-frequency partial discharge pulse signal UP and an injection capacitor C0, generates high-frequency pulse current with apparent charge quantity Q in a high-frequency verification wiring loop, generates various interference signals Us through other channels, and applies the interference signals Us to a sensor HFCT to be tested through the resistance Rs.

The beneficial effect that this application realized is as follows: by the high-frequency partial discharge anti-interference function checking method and system, the anti-interference function of the high-frequency partial discharge detector can be checked, the effectiveness of high-frequency partial discharge detection is effectively improved, and the detection level of the high-frequency partial discharge detector is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic diagram of a high-frequency partial discharge anti-interference function verification system according to an embodiment of the present disclosure;

FIG. 2 is a wiring diagram for checking the high-frequency anti-interference function;

fig. 3 is a flowchart of a high-frequency partial discharge anti-interference function verification method according to a second embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.