CN102288882A - Partial discharge monitoring system and method for multichannel electrical equipment - Google Patents

Abstract

The invention provides a multi-channel partial discharge monitoring system for electrical equipment, including a plurality of partial discharge signal acquisition sensors, a signal conditioning module, a multi-channel industrial computer acquisition module and a monitoring and processing center. The monitoring system collects electrical equipment partial discharge signals through these sensors Various characteristic parameters are processed by the signal conditioning module for analog signal processing. The multi-channel industrial computer acquisition module synchronously acquires the processed signals, and analyzes and processes them in the monitoring and processing center in real time. The patented system of the present invention adopts multiple sensors and multi-channels Real-time and synchronous collection of partial discharge signals breaks the shortcomings of traditional partial discharge single signal detection and separation of detection and analysis. It can analyze and process different information parameter characteristics for the same signal source of partial discharge to achieve more accurate and effective judgment of partial discharge. With the help of its multi-channel synchronous real-time acquisition signal characteristics, the partial discharge source can be located, which is beneficial to the maintenance and repair of electrical equipment.

Description

Multi-channel electrical equipment partial discharge monitoring system and method

technical field

The invention relates to a partial discharge monitoring system for multi-channel electrical equipment, and also relates to a partial discharge monitoring method for multi-channel electrical equipment.

Background technique

There are a large number of insulators in power equipment, and due to long-term withstand voltage or manufacturing process problems, these insulators will only discharge in a local area without passing through the conductors that apply the voltage. This phenomenon is called partial discharge. Partial discharge analysis includes analysis of materials, electric fields, spark characteristics, propagation and attenuation of pulse waveforms, sensor spatial sensitivity, frequency response, calibration, noise, and data interpretation.

The phenomenon of partial discharge in the insulation of high-voltage electrical equipment is periodic, and it goes on and on again and again with the change of AC voltage, and discharge occurs when the AC voltage reaches the discharge initiation voltage. When partial discharge occurs inside the insulation, energy in the form of light, sound waves, etc. will be generated. The quantity, amplitude and polarity of the partial discharge signal can directly reflect the condition of the insulation system. The partial discharge test of high-voltage electrical equipment is an effective means to evaluate the insulation quality. In recent years, with the development and application of sensors, computers, and optical fiber technology, the measurement of partial discharge has been digitized, the accuracy of measurement has been continuously improved, and online monitoring has been realized. At present, the measurement methods of partial discharge are generally divided into electrical measurement method and non-electric measurement method. Electrometry is a measurement method using high-frequency pulse current, which is widely used because of its high sensitivity and ease of use. The non-electrical measurement methods are mainly ultrasonic method and high-frequency method, which is currently researched hotly. The ultrasonic method can analyze the discharge signal in real time, and can also finally locate and detect the partial discharge part, and it can avoid the influence of electromagnetic interference, so it can be used for The occasions where electromagnetic interference is serious; and the high-frequency method is used to generate high-frequency electromagnetic signals for monitoring and analysis during partial discharge.

In terms of analysis methods and analysis devices, most of the monitoring systems at home and abroad are mostly single-type signal analysis, and it is impossible to complete the simultaneous comparison and analysis of multiple partial discharge signals in a single monitoring system.

Contents of the invention

In view of this, one of the objects of the present invention is to provide a multi-channel partial discharge monitoring system for electrical equipment, which can perform multiple types of signals, multi-channel, synchronous real-time monitoring and comparative analysis on the partial discharge of electrical equipment. Or audio-frequency combination or electro-acoustic-frequency combination method to realize the localization of partial discharge; the second purpose of the present invention is to provide a method for monitoring partial discharge of multi-channel electrical equipment.

One of purpose of the present invention is achieved through the following technical solutions:

The multi-channel partial discharge monitoring system for electrical equipment includes

Multiple partial discharge signal acquisition sensors, including current sensors, ultrasonic sensors and ultra-high frequency sensors, are used to collect various physical phenomenon state parameters of partial discharge of electrical equipment;

The signal conditioning module is used to process the signal collected by the partial discharge signal collection sensor, and send the processed signal data to the multi-channel industrial computer collection module;

Multi-channel industrial computer acquisition module, used for synchronous acquisition of multi-channel partial discharge signals and forwarding the signals to the monitoring and processing center;

The monitoring and processing center is used for synchronous analysis, processing and comparison of multi-channel partial discharge signals to form a comprehensive monitoring report. For signals generated by the same partial discharge signal source, the localization of partial discharge sources can be realized through electroacoustic combination, audio frequency or electroacoustic frequency combination

Further, the signal conditioning module performs digital signal processing on the collected partial discharge phenomenon state parameters, including signal conversion, filtering, and amplification processing;

Further, the multi-channel industrial computer acquisition module adopts multi-channel, high sampling rate synchronous data acquisition card;

Further, the monitoring and processing center uses virtual instrument technology to perform multi-channel real-time analysis, processing, result display, and real-time monitoring and event recording of the data from the acquisition card;

Further, the monitoring and processing center includes

The main module of human-computer interaction interface,

The parameter setting module is used to set parameters including alarm parameters for various partial discharge physical semaphores;

The data acquisition module is used for data acquisition of partial discharge physical signals of each channel, and adopts multi-channel data acquisition protocol and clock synchronization settings;

The real-time monitoring module, according to the analysis results of the data analysis and processing module, realizes the display of whether the partial discharge state parameters are normal, and chooses to locate the partial discharge signal source based on electro-acoustic combination or audio-frequency combination or electro-acoustic combination;

The data analysis and processing module is used to perform various data analysis and processing operations on various partial discharge physical signals, including digital filtering, spectrum analysis, and comparison with set alarm values;

The event recording module is used to query and display the alarm events of various state signal parameters at any time;

The database management module is used to store and query the analyzed and processed data and event data.

Two of the purpose of the present invention is achieved through the following technical solutions:

The method for monitoring partial discharge of multi-channel electrical equipment includes the following steps:

1) Use partial discharge signal acquisition sensors including current sensors, ultrasonic sensors and ultra-high frequency sensors to collect various physical phenomenon state parameters of partial discharge of electrical equipment;

2) Process the signal collected by the partial discharge signal collection sensor, and send the processed signal data to the multi-channel industrial computer collection module;

3) The multi-channel industrial computer acquisition module sends the synchronously acquired partial discharge state parameters to the monitoring and processing center;

4) The monitoring and processing center analyzes, processes and compares the synchronously collected multi-channel partial discharge state parameters to form a comprehensive monitoring report.

Further, in step 2), digital signal processing is performed on the state parameters of the partial discharge phenomenon, including signal conversion, filtering, and amplification processing;

Further, in step 3), for the signal generated by the same partial discharge signal source, localize the partial discharge source through electroacoustic combination, audio frequency or electroacoustic frequency combination;

Further, in step 4), the monitoring and processing center uses virtual instrument technology to perform multi-channel real-time analysis, processing, result display, real-time monitoring and event recording on the data from the acquisition card.

The beneficial effects of the present invention are:

The patent of the invention combines sensor technology, computer technology and monitoring technology to provide a new method for monitoring partial discharge of electrical equipment, solve the traditional way of detecting partial discharge with a single electrical signal, and realize the simultaneous monitoring of multiple physical semaphores of partial discharge , and the localization of the partial discharge signal source can be realized based on electro-acoustic combination or audio-frequency combination or electro-acoustic combination, which can effectively reduce maintenance and maintenance costs.

Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be obtained from Taught in the practice of the present invention. The objects and other advantages of the invention will be realized and attained by the following description and claims.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic diagram of the system structure of the present invention;

Figure 2 is a schematic diagram of the module composition of the monitoring and processing center.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

Existing traditional partial discharge monitoring basically adopts single signal detection, while the method for monitoring partial discharge of multi-channel electrical equipment of the present invention includes the following steps:

1) Use partial discharge signal acquisition sensors including current sensors, ultrasonic sensors and ultra-high frequency sensors to collect various physical phenomenon state parameters of partial discharge of electrical equipment;

2) Process the signal collected by the partial discharge signal collection sensor, and send the processed signal data to the multi-channel industrial computer collection module;

3) The multi-channel industrial computer acquisition module sends the synchronously acquired partial discharge state parameters to the monitoring and processing center;

4) The monitoring and processing center analyzes, processes and compares the synchronously collected multi-channel partial discharge state parameters to form a comprehensive monitoring report.

In step 2), digital signal processing is performed on the state parameters of the partial discharge phenomenon, including signal conversion, filtering, and amplification processing.

In step 3), for the signal generated by the same partial discharge signal source, the localization of the partial discharge source is realized through electro-acoustic combination, audio frequency or electro-acoustic frequency combination.

In step 4), the monitoring and processing center uses virtual instrument technology to perform multi-channel real-time analysis, processing, result display, real-time monitoring and event recording on the data from the acquisition card.

Based on the design idea of the above method, as shown in Figures 1 and 2, the multi-channel partial discharge monitoring system of the present invention includes

(1) Multiple partial discharge signal acquisition sensors: including current sensors, ultrasonic sensors and ultra-high frequency sensors, which are used to collect various physical phenomenon state parameters of partial discharge of electrical equipment;

(2) Signal conditioning module: used to process the signal collected by the partial discharge signal acquisition sensor, and send the processed signal data to the multi-channel industrial computer acquisition module; perform digital signal processing on the collected partial discharge phenomenon state parameters , including signal conversion, filtering, and amplification processing.

(3) Multi-channel industrial computer acquisition module: used for synchronous acquisition of multi-channel partial discharge signals and forwarding the signals to the monitoring and processing center; in the present invention, the multi-channel industrial computer acquisition module adopts multi-channel, high sampling rate synchronous data acquisition Card;

(4) Monitoring and processing center: used for synchronous analysis, processing and comparison of multi-channel partial discharge signals to form a comprehensive monitoring report. For signals generated by the same partial discharge signal source, partial discharge can be realized through electroacoustic combination, audio frequency or electroacoustic frequency combination. Power location.

In the present invention, the monitoring and processing center uses virtual instrument technology to perform multi-channel real-time analysis, processing, result display, real-time monitoring and event recording on the data from the acquisition card.

Specifically, the monitoring and processing center includes the main module of human-computer interaction interface, parameter setting module, data acquisition module, real-time monitoring module, data analysis and processing module, database management module and event recording module, etc. The functions of each module are as follows:

The parameter setting module is used to set parameters including alarm parameters for various partial discharge physical semaphores;

The data acquisition module is used for data acquisition of partial discharge physical signals of each channel, and adopts multi-channel data acquisition protocol and clock synchronization settings;

The real-time monitoring module is used to display whether the partial discharge state parameters are normal according to the analysis results of the data analysis and processing module, and at the same time choose to locate the partial discharge signal source based on electro-acoustic combination or audio-frequency combination or electro-acoustic-frequency combination;

The data analysis and processing module is used to perform various data analysis and processing operations on various partial discharge physical signals, including digital filtering, spectrum analysis, and comparison with set alarm values;

The event recording module is used to query and display the alarm events of various state signal parameters at any time;

The database management module is used to store and query the analyzed and processed data and event data;

The human-computer interaction interface main module is used to connect the above-mentioned modules to realize human-computer interaction.

The system of the present invention adopts multiple sensors and multiple channels to collect partial discharge signals synchronously in real time, which breaks the shortcomings of traditional partial discharge single signal detection and separation of detection and analysis, and can perform different information parameter characteristic analysis and processing on the same partial discharge signal source to achieve It can judge partial discharge more accurately and effectively, and locate the source of partial discharge with the help of its multi-channel synchronous real-time acquisition signal characteristics, which is beneficial to the maintenance and repair of electrical equipment.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements, without departing from the spirit and scope of the technical solution, should be included in the scope of the claims of the present invention.

Claims (9)

1. hyperchannel local discharge of electrical equipment monitoring system is characterized in that: comprise

A plurality of local discharge signal pick-up transducers comprise current sensor, sonac and uhf sensor, are used to gather the various physical phenomenon state parameters of local discharge of electrical equipment;

The signal condition module is used for the signal that the local discharge signal pick-up transducers is gathered is handled, and the signal data after will handling is sent to hyperchannel industrial computer acquisition module;

Hyperchannel industrial computer acquisition module, be used for the synchronous acquisition of hyperchannel local discharge signal and with signal forwarding to monitoring processing enter;

The monitoring processing enter is used for the processing of hyperchannel local discharge signal Synchronization Analysis and relatively, the report of formation comprehensive monitoring to the signal that same local discharge signal source produces, is united realization shelf depreciation source location frequently by acooustic combination, audio frequency or electroacoustic.

2. hyperchannel local discharge of electrical equipment monitoring system according to claim 1 is characterized in that: described signal condition module comprises conversion of signals, filtering, processing and amplifying to the signal Processing that the partial discharge phenomenon state parameter of being gathered carries out.

3. hyperchannel local discharge of electrical equipment monitoring system according to claim 1 is characterized in that: hyperchannel industrial computer acquisition module adopts the synchronous data collection card of hyperchannel, high sampling rate.

4. hyperchannel local discharge of electrical equipment monitoring system according to claim 3, it is characterized in that: described monitoring processing enter is carried out hyperchannel real-time analysis, processing, result's demonstration to the The data virtual instrument technique from capture card to it, and monitors in real time and logout.

5. hyperchannel local discharge of electrical equipment monitoring system according to claim 4 is characterized in that: described monitoring processing enter comprises

The human-computer interaction interface primary module,

Parameter is provided with module, is used for various shelf depreciation physical signalling amounts are comprised the parameter setting of alarm parameters;

Data acquisition module is used for the data acquisition to each path partially discharge physics signal, adopts based on multi-channel data acquisition agreement and clock synchronization setting;

In real time monitoring modular according to the analysis result of data analysis processing module, realizes showing whether the shelf depreciation state parameter is normal, selects simultaneously to unite frequently based on acooustic combination or audio frequency associating or electroacoustic and realizes the local discharge signal source location;

The data analysis processing module, be used for to various shelf depreciation physical signallings comprise digital filtering, spectrum analysis, with set the various data analyses that alarming value compares and handle operation;

The logout module is used for inquiry at any time and demonstration to each status signal parameter alert event;

Database management module is used for the data and the event data of analyzing and processing are stored, inquired about.

6. hyperchannel local discharge of electrical equipment monitoring method is characterized in that: said method comprising the steps of:

1) adopts the local discharge signal pick-up transducers that comprises current sensor, sonac and uhf sensor, gather the various physical phenomenon state parameters of local discharge of electrical equipment;

2) signal that the local discharge signal pick-up transducers is gathered is handled, and the signal data after will handling is sent to hyperchannel industrial computer acquisition module;

3) hyperchannel industrial computer acquisition module is sent to the monitoring processing enter with the shelf depreciation state parameter of synchronous acquisition;

4) the monitoring processing enter is carried out analyzing and processing and comparison to the hyperchannel shelf depreciation state parameter of synchronous acquisition, forms the comprehensive monitoring report.

7. hyperchannel local discharge of electrical equipment monitoring method according to claim 6 is characterized in that: in step 2) in, the partial discharge phenomenon state parameter is carried out digital signal processing, comprise conversion of signals, filtering, processing and amplifying.

8. hyperchannel local discharge of electrical equipment monitoring method according to claim 7 is characterized in that: in step 3), to the signal that same local discharge signal source produces, unite realization shelf depreciation source location frequently by acooustic combination, audio frequency or electroacoustic.

9. hyperchannel local discharge of electrical equipment monitoring system according to claim 8, it is characterized in that: in step 4), the monitoring processing enter is carried out hyperchannel real-time analysis, processing, result's demonstration to the The data virtual instrument technique from capture card to it, and monitors in real time and logout.

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