阅读说明：本技术 一种gis局放在线监测系统及方法 (GIS partial discharge online monitoring system and method ) 是由 魏文辉 魏建功 张文凯 张锋 于 2019-08-06 设计创作，主要内容包括：本发明提供一种GIS局放在线监测系统及方法,所述在线监测系统包括：传感器层,用于采集GIS内部发生的局部放电信号；现场监测层,用于就地对采集的局部放电信号进行数字化处理和保存,并将处理后的数据发送给数据中心层；数据中心层,用于对处理后的数据进行实时监测、统计分析、预警报警和显示发布,以供远程查看。本发明提供的GIS局部放电在线监测系统及方法能够实时监测GIS在运行过种中的局部放电情况,可以及时对GIS绝缘异常状态和放电性故障做出预警,为GIS正常运行提供必要的指导数据,提高GIS运行的可靠性,安全性和有效性。(the invention provides a GIS partial discharge online monitoring system and a method, wherein the online monitoring system comprises: the sensor layer is used for collecting partial discharge signals generated in the GIS; the field monitoring layer is used for carrying out digital processing and storage on the acquired partial discharge signals on site and sending the processed data to the data center layer; and the data center layer is used for carrying out real-time monitoring, statistical analysis, early warning and alarm and display release on the processed data so as to be remotely checked. The GIS partial discharge online monitoring system and method provided by the invention can monitor the partial discharge condition of the GIS in the running process in real time, can give early warning to the GIS insulation abnormal state and discharge fault in time, provide necessary guidance data for the normal running of the GIS, and improve the running reliability, safety and effectiveness of the GIS.)

1. the utility model provides a GIS partial discharge on-line monitoring system which characterized in that includes:

The sensor layer is used for collecting partial discharge signals generated in the GIS;

the field monitoring layer is used for carrying out digital processing and storage on the acquired partial discharge signals on site and sending the processed data to the data center layer;

And the data center layer is used for carrying out real-time monitoring, statistical analysis, early warning and alarm and display release on the processed data so as to be remotely checked.

2. The GIS partial discharge online monitoring system according to claim 1, wherein the field monitoring layer comprises a plurality of field signal processing units, the data center layer controls a plurality of the field signal processing units simultaneously, the sensor layer comprises a plurality of sensor units, each sensor unit comprises a plurality of uhf sensors and a power frequency synchronization sensor, and each field signal processing unit is configured to process a signal collected by one sensor unit.

3. The GIS partial discharge online monitoring system according to claim 2, wherein the UHF sensor is used for collecting UHF signals, and the industrial frequency synchronous sensor is used for collecting industrial frequency signals;

The field signal processing unit includes:

the amplifying and filtering module is used for amplifying and filtering the signals acquired by the ultrahigh frequency sensor and the power frequency synchronous sensor;

The signal conversion module is used for carrying out analog-to-digital conversion on the amplified and filtered signals;

And the communication module is used for transmitting the data after the analog-to-digital conversion to the data center layer.

4. The GIS partial discharge online monitoring system of claim 1, wherein the data center layer comprises:

the real-time monitoring module is used for monitoring the maximum discharge capacity, the discharge phase and the discharge frequency in real time according to the processed data, and the monitoring period is set and adjusted according to requirements;

The statistical analysis module is used for carrying out statistics on the maximum discharge capacity, the discharge phase and the discharge frequency according to the processed data to form a discharge spectrogram, analyzing the discharge spectrograms at different detection points and different periods and judging the discharge position and the discharge type;

the early warning module is used for comparing the statistical analysis result with a preset warning scheme and giving a warning when the warning condition is met;

and the display and release unit is used for displaying the real-time monitoring result, the statistical analysis result and the early warning alarm result through a display or releasing the real-time monitoring result, the statistical analysis result and the early warning alarm result through a webpage so as to be remotely viewed.

5. The GIS local discharge online monitoring system according to any one of claims 1-4, wherein the sensor layer is configured to collect UHF signals in the frequency domain of 200MHz to 3 GHz.

6. The GIS partial discharge online monitoring system according to any one of claims 1-4, wherein the sensor layer collects partial discharge signals by means of detection.

7. a GIS partial discharge online monitoring method is characterized by comprising the following steps:

S1, collecting partial discharge signals generated in the GIS;

S2, carrying out digital processing and storage on the collected partial discharge signals on site;

And S3, carrying out real-time monitoring, statistical analysis, early warning and alarm and display release on the processed data for remote viewing.

8. the GIS partial discharge online monitoring method according to claim 7, wherein the step S1 includes:

collecting ultrahigh frequency signals by utilizing an ultrahigh frequency sensor;

and acquiring a power frequency signal by using a power frequency synchronous sensor.

9. the GIS partial discharge online monitoring method according to claim 7, wherein the step S2 includes:

amplifying and filtering the acquired signals;

Performing analog-to-digital conversion on the amplified and filtered signal;

and storing and transmitting the data after the analog-digital conversion.

10. the GIS partial discharge online monitoring method according to claim 7, wherein the step S3 includes:

Monitoring the maximum discharge capacity, the discharge phase and the discharge frequency in real time according to the processed data, and setting and adjusting the monitoring period according to requirements;

counting the maximum discharge capacity, the discharge phase and the discharge frequency according to the processed data to form a discharge spectrogram, analyzing the discharge spectrogram at different detection points and different periods, and judging the discharge position and the discharge type;

Comparing the result of the statistical analysis with a preset alarm scheme, and alarming when the alarm condition is met;

the real-time monitoring result, the statistical analysis result and the early warning alarm result are displayed through a display, or

The user publishes the information through a webpage for remote viewing.

Technical Field

The invention relates to the technical field of cable abnormal discharge monitoring, in particular to a GIS partial discharge online monitoring system and method.

Background

partial discharges may occur to varying degrees within a GIS due to latent insulation defects that occur during manufacturing or long term operation, which may cause insulation degradation, and even breakdown or flashover. The online detection of the partial discharge in the GIS is an effective means for finding the defects, and has important significance for mastering the insulation condition in real time and improving the running reliability of the GIS.

disclosure of Invention

the invention aims to provide a GIS partial discharge online monitoring system and a GIS partial discharge online monitoring method, which are used for solving the problem of real-time online monitoring of partial discharge in the existing GIS.

in order to solve the above technical problem, an embodiment of the present invention provides an online monitoring system for a GIS partial discharge, including:

The sensor layer is used for collecting partial discharge signals generated in the GIS;

the field monitoring layer is used for carrying out digital processing and storage on the acquired partial discharge signals on site and sending the processed data to the data center layer;

And the data center layer is used for carrying out real-time monitoring, statistical analysis, early warning and alarm and display release on the processed data so as to be remotely checked.

Preferably, the field monitoring layer comprises a plurality of field signal processing units, the data center layer controls the plurality of field signal processing units simultaneously, the sensor layer comprises a plurality of sensor units, each sensor unit comprises a plurality of ultrahigh frequency sensors and a power frequency synchronous sensor, and each field signal processing unit is used for processing a signal acquired by the sensor unit.

preferably, the ultrahigh frequency sensor is used for acquiring ultrahigh frequency signals, and the power frequency synchronous sensor is used for acquiring power frequency signals;

The field signal processing unit includes:

The amplifying and filtering module is used for amplifying and filtering the signals acquired by the ultrahigh frequency sensor and the power frequency synchronous sensor;

the signal conversion module is used for carrying out analog-to-digital conversion on the amplified and filtered signals;

and the communication module is used for transmitting the data after the analog-to-digital conversion to the data center layer.

preferably, the data center layer includes:

the real-time monitoring module is used for monitoring the maximum discharge capacity, the discharge phase and the discharge frequency in real time according to the processed data, and the monitoring period is set and adjusted according to requirements;

the statistical analysis module is used for carrying out statistics on the maximum discharge capacity, the discharge phase and the discharge frequency according to the processed data to form a discharge spectrogram, analyzing the discharge spectrograms at different detection points and different periods and judging the discharge position and the discharge type;

The early warning module is used for comparing the statistical analysis result with a preset warning scheme and giving a warning when the warning condition is met;

And the display and release unit is used for displaying the real-time monitoring result, the statistical analysis result and the early warning alarm result through a display or releasing the real-time monitoring result, the statistical analysis result and the early warning alarm result through a webpage so as to be remotely viewed.

preferably, the sensor layer is used for collecting ultrahigh frequency signals in the frequency domain of 200 MHz-3 GHz.

preferably, the sensor layer collects a partial discharge signal by adopting a detection mode.

The embodiment of the invention also provides a GIS partial discharge online monitoring method, which comprises the following steps:

S1, collecting partial discharge signals generated in the GIS;

s2, carrying out digital processing and storage on the collected partial discharge signals on site;

and S3, carrying out real-time monitoring, statistical analysis, early warning and alarm and display release on the processed data for remote viewing.

Preferably, the step S1 includes:

Collecting ultrahigh frequency signals by utilizing an ultrahigh frequency sensor;

And acquiring a power frequency signal by using a power frequency synchronous sensor.

Preferably, the step S2 includes:

Amplifying and filtering the acquired signals;

Performing analog-to-digital conversion on the amplified and filtered signal;

And storing and transmitting the data after the analog-digital conversion.

preferably, the step S3 includes:

monitoring the maximum discharge capacity, the discharge phase and the discharge frequency in real time according to the processed data, and setting and adjusting the monitoring period according to requirements;

counting the maximum discharge capacity, the discharge phase and the discharge frequency according to the processed data to form a discharge spectrogram, analyzing the discharge spectrogram at different detection points and different periods, and judging the discharge position and the discharge type;

comparing the result of the statistical analysis with a preset alarm scheme, and alarming when the alarm condition is met;

and displaying the real-time monitoring result, the statistical analysis result and the early warning alarm result through a display, or publishing the real-time monitoring result, the statistical analysis result and the early warning alarm result through a webpage so as to be remotely viewed.

the technical scheme of the invention has the following beneficial effects:

the GIS partial discharge online monitoring system and method provided by the invention can monitor the partial discharge condition of the GIS in the running process in real time, can give early warning to the GIS insulation abnormal state and discharge fault in time, provide necessary guidance data for the normal running of the GIS, and improve the running reliability, safety and effectiveness of the GIS.

drawings

fig. 1 is a schematic structural diagram of a GIS partial discharge online monitoring system according to an embodiment of the present invention;

fig. 2 is a flowchart of a GIS partial discharge online monitoring method according to an embodiment of the present invention.

Detailed Description

in order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides a GIS partial discharge online monitoring system aiming at the problem of partial discharge monitoring in the existing GIS, as shown in figure 1: the online monitoring system comprises:

the sensor layer 1 is used for collecting partial discharge signals generated in the GIS;

The field monitoring layer 2 is used for carrying out digital processing and storage on the acquired partial discharge signals on site and sending the processed data to the data center layer 3;

and the data center layer 3 is used for carrying out real-time monitoring, statistical analysis, early warning and alarm and display release on the processed data so as to be remotely checked.

Specifically, the data center layer 3 may be a master station or a diagnostic server, and the field monitoring layer 2 processes and stores online monitoring signals in situ, so as to reduce network load. After the analog signals collected and digitized at high speed are processed at high speed locally, the partial discharge data are transmitted to the data center layer 3 in a TCP/IP protocol mode through a network interface, and instructions of configuration, management and the like of the data center layer 3 are received through a network interface. The data center layer 3 performs statistical analysis and intelligent alarm on the partial discharge data, displays the partial discharge monitoring result, issues the partial discharge monitoring result, and facilitates remote checking and operation control.

The GIS partial discharge online monitoring system and method provided by the invention can monitor the partial discharge condition of the GIS in the running process in real time, can give early warning to the GIS insulation abnormal state and discharge fault in time, provide necessary guidance data for the normal running of the GIS, and improve the running reliability, safety and effectiveness of the GIS.

Further, the field monitoring layer 2 includes a plurality of field signal processing units 21, the data center layer 3 controls the plurality of field signal processing units 21 simultaneously, the sensor layer 1 includes a plurality of sensor units 11, each sensor unit 11 includes a plurality of ultrahigh frequency sensors 111 and a power frequency synchronous sensor 112, and each field signal processing unit 21 is configured to process a signal collected by one sensor unit 11.

In a preferred embodiment of the present invention, each on-site signal processing unit 21 can collect signals of 16 uhf sensors and 1 power frequency synchronous sensor.

Further, the ultrahigh frequency sensor 111 is used for acquiring ultrahigh frequency signals, and the power frequency synchronous sensor 112 is used for acquiring power frequency signals;

The field signal processing unit 21 includes:

The amplifying and filtering module is used for amplifying and filtering signals acquired by the ultrahigh frequency sensor 111 and the power frequency synchronous sensor 112;

the signal conversion module is used for carrying out analog-to-digital conversion on the amplified and filtered signals;

And the communication module is used for transmitting the data after analog-to-digital conversion to the data center layer 3.

in the invention, the sensor layer 1, the field monitoring layer 2 and the data center layer 3 are communicated with each other through Ethernet or optical fibers.

further, the data center layer 3 includes:

The real-time monitoring module is used for monitoring the maximum discharge capacity, the discharge phase and the discharge frequency in real time according to the processed data, and the monitoring period is set and adjusted according to requirements;

The statistical analysis module is used for carrying out statistics on the maximum discharge capacity, the discharge phase and the discharge frequency according to the processed data to form a discharge spectrogram, analyzing the discharge spectrograms at different detection points and different periods and judging the discharge position and the discharge type;

The early warning module is used for comparing the statistical analysis result with a preset warning scheme and giving a warning when the warning condition is met;

And the display and release unit is used for displaying the real-time monitoring result, the statistical analysis result and the early warning alarm result through a display or releasing the real-time monitoring result, the statistical analysis result and the early warning alarm result through a webpage so as to be remotely viewed.

preferably, the sensor layer 1 is used for collecting ultrahigh frequency signals in a frequency domain of 200MHz to 3GHz, and the sensor layer 3 collects partial discharge signals by adopting a detection mode.

because ultrahigh frequency partial discharge detection needs to measure discharge signals from hundreds of megahertz to gigahertz at least above one power frequency period, a common A/D conversion system is difficult to meet the requirements in the aspects of sampling rate, storage depth and the like, and the data processing difficulty is high. In addition, the partial discharge measurement usually only concerns the amplitude, the phase position and the discharge repetition rate of the signal, so the online monitoring system of the invention adopts a detection mode and only detects, analyzes and stores the main information of the discharge signal.

in summary, the GIS partial discharge online monitoring system provided in the embodiment of the present invention can implement the following functions:

1) Partial discharge detection function

The online monitoring system can sensitively and effectively monitor various types of partial discharge possibly occurring in the GIS, can effectively inhibit and eliminate interference in a complex electromagnetic environment on site, and meets the requirement of monitoring sensitivity.

2) signal acquisition and storage function

The online monitoring system can collect and store GIS partial discharge data at regular time according to a preset program. The monitoring data can be stored according to the following principle: a cyclic refreshing mode is adopted for recent monitoring data, and original data are completely stored; data compression is carried out on the long-term monitoring data, and only characteristic quantities such as maximum discharge quantity, discharge frequency and the like are stored; and original data should be completely stored for the monitoring data of the abnormal alarm condition.

3) Detection parameter setting function

The on-line monitoring system can perform the functions of parameter setting, parameter retrieval, time setting and the like, and detection personnel can adjust the monitoring period, the detection threshold value, the alarm condition and the like of partial discharge according to the actual situation on site.

4) network communication function

The on-line monitoring system has the functions of information conversion and communication, and can realize remote transmission of monitoring data, alarm information and diagnosis results.

5) monitoring result display function

the online monitoring system has a convenient man-machine interaction function, and is convenient for observing the monitoring result of GIS partial discharge visually and in multiple angles.

6) Abnormal alarm function

The online monitoring system can alarm abnormal monitoring results according to preset alarm conditions. The alarm strategy comprises threshold value alarm and trend alarm, and different alarm levels can be given according to the partial discharge severity.

7) discharge type recognition function

The online monitoring system can judge typical partial discharge types (free metal particle discharge, suspension potential body discharge, creeping discharge, air gap discharge inside an insulating part, metal point discharge and the like) in the GIS or give the possibility of occurrence of various partial discharges, and the diagnosis result is simple and clear.

8) Positioning function of discharge source

the on-line monitoring system can position the local discharge source and indicate the position of a detection point and a gas chamber corresponding to the local discharge source.

9) self-detection and self-recovery function

The on-line monitoring system has a self-detection function, can provide self-detection information and hard nodes of the running state of the monitoring system, and records fault logs of the monitoring system.

In addition, the on-line monitoring system also has a self-recovery function, and can automatically recover normal operation after abnormal power supply interruption and other conditions occur.

in addition, the on-line monitoring system meets the modularization and standardization requirements, can be flexibly expanded according to the change of the monitoring points, supports the hot plug and interchangeability requirements, and does not influence the normal work of other modules or units when any module or unit is overhauled.

Correspondingly, the invention also provides a GIS partial discharge online monitoring method, as shown in FIG. 2, the online monitoring method comprises the following steps:

s1, collecting partial discharge signals generated in the GIS;

S2, carrying out digital processing and storage on the collected partial discharge signals on site;

And S3, carrying out real-time monitoring, statistical analysis, early warning and alarm and display release on the processed data for remote viewing.

Further, step S1 includes:

collecting ultrahigh frequency signals by utilizing an ultrahigh frequency sensor;

and acquiring a power frequency signal by using a power frequency synchronous sensor.

further, step S2 includes:

amplifying and filtering the acquired signals;

performing analog-to-digital conversion on the amplified and filtered signal;

and storing and transmitting the data after the analog-digital conversion.

Further, step S3 includes:

monitoring the maximum discharge capacity, the discharge phase and the discharge frequency in real time according to the processed data, and setting and adjusting the monitoring period according to requirements;

Counting the maximum discharge capacity, the discharge phase and the discharge frequency according to the processed data to form a discharge spectrogram, analyzing the discharge spectrogram at different detection points and different periods, and judging the discharge position and the discharge type;

comparing the result of the statistical analysis with a preset alarm scheme, and alarming when the alarm condition is met;

and displaying the real-time monitoring result, the statistical analysis result and the early warning alarm result through a display, or publishing the real-time monitoring result, the statistical analysis result and the early warning alarm result through a webpage so as to be remotely viewed.

The GIS partial discharge online monitoring system and method provided by the invention can monitor the partial discharge condition of the GIS in the running process in real time, can give early warning to the GIS insulation abnormal state and discharge fault in time, provide necessary guidance data for the normal running of the GIS, and improve the running reliability, safety and effectiveness of the GIS.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.