CN105759187A - Combined electric apparatus partial discharge multi-information fusion diagnostic device - Google Patents

Abstract

The invention relates to the technical field of partial discharge detection equipment, in particular to a multi-information fusion diagnosis device for partial discharge of combined electric appliances. In the present invention, a UHF signal conversion module, a high frequency signal conversion module, an ultrasonic signal conversion module and a power frequency signal conversion module are all connected to the acquisition and analysis module. The invention can simultaneously detect ultra-high-frequency signals, high-frequency current signals and ultrasonic signals of partial discharges. Through comparative analysis of these three types of acoustic-electric signals, it has strong anti-interference ability and accurate positioning, greatly improving the effectiveness and reliability of detection results. sex. It not only avoids the attenuation caused by the analog signal transmitted by the cable, but also makes the wiring of the device more concise and the field application more flexible. It can realize synchronous start and parallel acquisition of high and low speed data collectors. The invention is based on virtual instrument technology, has relatively low cost, short software development cycle, flexible structure and strong expansibility.

Description

Multi-information Fusion Diagnosis Device for Partial Discharge of Combined Electrical Appliances

technical field

The invention relates to the technical field of partial discharge detection equipment, in particular to a multi-information fusion diagnosis device for partial discharge of combined electric appliances.

Background technique

Gas insulated switchgear (GIS) has been more and more widely used at home and abroad in recent decades due to the advantages of small footprint, little influence from the external environment, safe and reliable operation, and simple maintenance. However, in the process of GIS manufacturing and assembly, some small defects are often left inside the GIS due to problems such as technology, such as metal particles, insulating air gaps, etc. These small defects may develop into dangerous hazards during the operation of the GIS. Discharge channels, and eventually cause insulation breakdown accidents. Therefore, in order to prevent the insulation failure of GIS equipment and ensure the safe operation of the power system, it is increasingly important to monitor the partial discharge of the GIS in operation.

In the GIS partial discharge monitoring, after the partial discharge is found in the equipment, the partial discharge can be quickly and accurately located to formulate an efficient and feasible equipment maintenance plan, which is of great significance for quickly eliminating hidden troubles and ensuring the safe operation of the system. Therefore, partial discharge localization technology has been widely concerned in GIS field safety maintenance. At present, ultra-high frequency (UHF) method and ultrasonic method are mostly used for partial discharge localization at home and abroad. The UHF method has been widely used due to its simple principle and high sensitivity, but it is difficult to accurately locate equipment defects. Especially when the defect is located near the insulator, it is difficult to accurately determine the air chamber where it is located, which increases the complexity of maintenance. Although the ultrasonic positioning method has good sensitivity and high positioning accuracy, its effective range is small, and the work in field application is relatively heavy. Therefore, how to effectively combine the advantages of both to achieve fast and accurate positioning has become the focus of on-site maintenance personnel in recent years.

At present, there are many portable GIS partial discharge detection systems developed based on the combination of acoustic and electric methods. If such systems use down-frequency processing, they cannot be used for partial discharge positioning due to the low sampling rate. If it is used for positioning, due to the high sampling frequency required by the ultra-high frequency signal, an ultra-high-speed oscilloscope is generally used as the system hardware platform. Due to the limitation of its on-board storage space, the length of continuous sampling is limited, and it is impossible to obtain enough partial discharge The pulse signal is used for the analysis of the amplitude and phase distribution spectrum of the discharge, so the discharge diagnosis cannot be performed.

Contents of the invention

The object of the present invention is to provide a multi-information fusion diagnostic device for partial discharge of combined electrical appliances, which can simultaneously detect the UHF signal, high-frequency current signal and ultrasonic signal of GIS partial discharge, locate the partial discharge source, and It has the characteristics of strong anti-interference ability on site, high accuracy of partial discharge detection, simple measurement and high efficiency.

In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions to realize:

Multi-information fusion diagnostic device for partial discharge of combined electrical appliances, in which the UHF signal conversion module, high frequency signal conversion module, ultrasonic signal conversion module, and power frequency signal conversion module are all connected to the acquisition and analysis module.

The UHF signal conversion module includes a UHF signal sensor, a UHF signal conditioner, a UHF signal wireless transmitter and a UHF signal wireless receiver; wherein, the UHF signal sensor, the UHF signal The conditioner, the UHF signal wireless transmitter and the UHF signal wireless receiver are connected in sequence, and the other end of the UHF signal wireless receiver is connected to the high-speed synchronous parallel data collector;

The high-frequency signal conversion module includes a high-frequency signal sensor, a high-frequency signal conditioner, a high-frequency signal wireless transmitter and a high-frequency signal wireless receiver; wherein, the high-frequency signal sensor, high-frequency signal conditioner, high-frequency signal wireless The transmitter and the high-frequency signal wireless receiver are connected sequentially, and the other end of the high-frequency signal wireless receiver is connected with the high-speed synchronous parallel data collector;

The ultrasonic signal conversion module includes an ultrasonic signal sensor, an ultrasonic signal conditioner, an ultrasonic signal wireless transmitter and an ultrasonic signal wireless receiver; wherein the ultrasonic signal sensor, an ultrasonic signal conditioner, an ultrasonic signal wireless transmitter and an ultrasonic signal wireless receiver Connected in turn, the other end of the ultrasonic signal wireless receiver is connected with the low-speed synchronous parallel data collector;

The power frequency signal conversion module includes a power frequency signal sensor, a power frequency signal conditioner, a power frequency signal wireless transmitter and a power frequency signal wireless receiver; wherein, the power frequency signal sensor, power frequency signal conditioner, power frequency signal wireless The transmitter and the power frequency signal wireless receiver are connected in turn, and the other end of the power frequency signal wireless receiver is connected with the low-speed synchronous parallel data collector;

Described acquisition analysis module comprises high-speed synchronous parallel data collector, low-speed synchronous parallel data collector and notebook computer; Wherein, high-speed synchronous parallel data collector and low-speed synchronous parallel data collector are installed in the same PXI rack, through rack data It is connected to the bus and connected to the network port of the laptop through the PCIExpress interface.

After the signal detected by the UHF signal sensor is processed by the UHF signal conditioner, it is sent to the UHF signal wireless receiver by the UHF signal wireless transmitter, and then connected to the high-speed synchronous parallel data collector;

After the signal detected by the high-frequency signal sensor is processed by the high-frequency signal conditioner, it is sent to the high-frequency signal wireless receiver by the high-frequency signal wireless transmitter, and then connected to the high-speed synchronous parallel data collector;

After the signal detected by the ultrasonic signal sensor is processed by the ultrasonic signal conditioner, it is sent to the ultrasonic signal wireless receiver by the ultrasonic signal wireless transmitter, and then connected to the low-speed synchronous parallel data collector;

After the signal detected by the power frequency signal sensor is processed by the power frequency signal conditioner, it is sent to the power frequency signal wireless receiver by the power frequency signal wireless transmitter, and then connected to the low-speed synchronous parallel data collector;

The high-speed synchronous parallel data collector uses the partial discharge pulse signal itself as a trigger signal, and the trigger signal is synchronously output to the low-speed synchronous parallel data collector through the trigger signal output port of the high-speed synchronous parallel data collector through the high-frequency coaxial shielded signal line The trigger signal input port of the device.

The detection bandwidth of the UHF signal sensor is 300MHz-1500MHz, the detection bandwidth of the high-frequency signal sensor is 0.5MHz-30MHz, the detection bandwidth of the ultrasonic signal sensor is 20kHz-200kHz, and the power frequency The signal sensor couples the power frequency voltage signal of the equipment under inspection.

The notebook computer is equipped with a development system based on the LabVIEW virtual instrument platform, and the notebook computer is responsible for control, processing, analysis and display, and provides the operator with the selection of system configuration parameters through the human-computer interaction interface of the system software, including sampling rate, sampling length, Trigger level, sampling amplitude range, phase calibration offset and other related parameters; during the data acquisition process, the system displays the sampled original waveform and data in real time, and monitors the data acquisition status; the analysis function can select the original waveform data or the calculated PRPD map data, and according to the partial discharge judgment method and partial discharge source location method to identify partial discharge analysis.

The diagnostic method of the multi-information fusion diagnostic device for partial discharge of combined electrical appliances is that when the diagnostic device starts to work normally, the collection and analysis module simultaneously receives the One or more of the UHF signal, high frequency current signal and ultrasonic signal coupled by the UHF signal sensor, high frequency signal sensor, ultrasonic signal sensor and power frequency signal sensor, through several types of acoustic and electrical signals By comparative analysis and eliminating interference signals, it can be directly judged that there is partial discharge in the gas insulated switch of the substation to be tested.

The partial discharge source positioning method of the diagnostic device is based on the amplitude or time difference of the multi-channel UHF signal of the device, the time difference between UHF and ultrasonic signals or the time difference of multi-channel ultrasonic signals. The time difference is based on the energy Obtained by accumulation method.

The partial discharge source location includes preliminary location and precise location.

Compared with prior art, advantage of the present invention is as follows:

The present invention is a multi-information fusion diagnostic device for partial discharge of combined electrical appliances based on virtual instrument technology, and has the following four innovations compared with the prior art:

1. The present invention can simultaneously detect UHF signals, high-frequency current signals and ultrasonic signals of partial discharge. Through comparative analysis of these three types of acoustic and electrical signals, it has strong anti-interference ability and accurate positioning, greatly improving the effectiveness of detection results and reliability.

2. The wireless data transmission mode is adopted between the sensor conditioner and the data collector in the present invention, which has the advantage of not only avoiding the attenuation caused by the analog signal transmitted by the cable, but also making the wiring of the device more concise and field application more convenient. flexible.

3. The present invention integrates a high-speed synchronous parallel data collector and a low-speed synchronous parallel data collector. The high-speed synchronous parallel data collector uses the partial discharge pulse signal as a trigger signal, and simultaneously synchronizes the signal to the low-speed synchronous parallel data collector to realize Synchronous start and parallel acquisition of high and low speed data collectors.

4. The present invention is based on virtual instrument technology, with relatively low cost, short software development cycle, flexible structure and strong scalability.

Description of drawings

Fig. 1 is an overall structure diagram of a multi-information fusion diagnosis device for partial discharge of combined electric appliances.

In the figure: UHF signal conversion module 1, high frequency signal conversion module 2, ultrasonic signal conversion module 3, power frequency signal conversion module 4, acquisition and analysis module 5, UHF signal sensor 11, UHF signal conditioner 12 , UHF signal wireless transmitter 13, UHF signal wireless receiver 14, high frequency signal sensor 21, high frequency signal conditioner 22, high frequency signal wireless transmitter 23, high frequency signal wireless receiver 24, ultrasonic signal Sensor 31, ultrasonic signal conditioner 32, ultrasonic signal wireless transmitter 33, ultrasonic signal wireless receiver 34, power frequency signal sensor 41, power frequency signal conditioner 42, power frequency signal wireless transmitter 43, power frequency signal wireless receiver 44. A high-speed synchronous parallel data collector 51, a low-speed synchronous parallel data collector 52, and a notebook computer 53.

detailed description

Embodiment, referring to Fig. 1, a multi-information fusion diagnosis device for partial discharge of combined electrical appliances, including UHF signal conversion module 1, high frequency signal conversion module 2, ultrasonic signal conversion module 3, power frequency signal conversion module 4 and acquisition and analysis Module 5. Among them, the UHF signal conversion module 1 , the high frequency signal conversion module 2 , the ultrasonic signal conversion module 3 , and the power frequency signal conversion module 4 are all connected to the acquisition and analysis module 5 .

The UHF signal conversion module 1 includes a UHF signal sensor 11 , a UHF signal conditioner 12 , a UHF signal wireless transmitter 13 and a UHF signal wireless receiver 14 . UHF signal sensor 11, UHF signal conditioner 12, UHF signal wireless transmitter 13 and UHF signal wireless receiver 14 are connected sequentially, and the other end of UHF signal wireless receiver 14 is connected to high-speed synchronous parallel Data collector 51.

When working, the signal detected by the UHF signal sensor 11 is processed by the UHF signal conditioner 12, and then sent to the UHF signal wireless receiver 14 by the UHF signal wireless transmitter 13, and then connected to the high-speed synchronous parallel Data collector 51.

The high frequency signal conversion module 2 includes a high frequency signal sensor 21 , a high frequency signal conditioner 22 , a high frequency signal wireless transmitter 23 and a high frequency signal wireless receiver 24 . High-frequency signal sensor 21, high-frequency signal conditioner 22, high-frequency signal wireless transmitter 23 and high-frequency signal wireless receiver 24 are connected successively, and the other end of high-frequency signal wireless receiver 24 is connected with high-speed synchronous parallel data collector 51 connect.

During work, after the signal detected by the high-frequency signal sensor 21 is processed by the high-frequency signal conditioner 22, it is sent to the high-frequency signal wireless receiver 24 by the high-frequency signal wireless transmitter 23, and then connected to the high-speed synchronous parallel data collector 51 ;

The ultrasonic signal conversion module 3 includes an ultrasonic signal sensor 31 , an ultrasonic signal conditioner 32 , an ultrasonic signal wireless transmitter 33 and an ultrasonic signal wireless receiver 34 . Ultrasonic signal sensor 31 , ultrasonic signal conditioner 32 , ultrasonic signal wireless transmitter 33 and ultrasonic signal wireless receiver 34 are connected sequentially, and the other end of ultrasonic signal wireless receiver 34 is connected with low-speed synchronous parallel data collector 52 .

During work, after the signal detected by the ultrasonic signal sensor 31 is processed by the ultrasonic signal conditioner 32, it is sent to the ultrasonic signal wireless receiver 34 by the ultrasonic signal wireless transmitter 33, and then connected to the low-speed synchronous parallel data collector 52;

The power frequency signal conversion module 4 includes a power frequency signal sensor 41 , a power frequency signal conditioner 42 , a power frequency signal wireless transmitter 43 and a power frequency signal wireless receiver 44 . The power frequency signal sensor 41, the power frequency signal conditioner 42, the power frequency signal wireless transmitter 43 and the power frequency signal wireless receiver 44 are connected in sequence, and the other end of the power frequency signal wireless receiver 44 is the same as the low-speed synchronous parallel data collector 52 are connected.

During work, after the signal detected by the power frequency signal sensor 41 is processed by the power frequency signal conditioner 42, it is sent to the power frequency signal wireless receiver 44 by the power frequency signal wireless transmitter 43, and then connected to the low-speed synchronous parallel data collector 52 ;

Described acquisition analysis module 5 comprises high-speed synchronous parallel data collector 51, low-speed synchronous parallel data collector 52 and notebook computer 53, high-speed synchronous parallel data collector 51 and low-speed synchronous parallel data collector 52 are installed in the same PXI frame , connected through the rack data bus, and connected to the network port of the notebook computer 53 through the PCIExpress interface, the notebook computer 53 is installed with system software developed based on the LabVIEW virtual instrument platform, responsible for control, processing, analysis and display. The LabVIEW is a program development environment developed by National Instruments (NI). LabVIEW uses a graphical editing language G to write programs, and the generated programs are in the form of block diagrams.

The high-speed synchronous parallel data collector 51 uses the partial discharge pulse signal itself as a trigger signal, and the trigger signal is synchronously output to the low-speed synchronous parallel data collector 51 via the high-frequency coaxial shielded signal line through the trigger signal output port of the high-speed synchronous parallel data collector 51. The trigger signal input port of the data collector 52 .

The detection bandwidth of the UHF signal sensor 11 is 300MHz-1500MHz, the detection bandwidth of the high-frequency signal sensor 21 is 0.5MHz-30MHz, and the detection bandwidth of the ultrasonic signal sensor 31 is 20kHz-200kHz. The power frequency signal sensor 41 described above is coupled to the power frequency voltage signal of the equipment under inspection.

The notebook computer 53 is responsible for control, processing, analysis and display, and provides the operator with the choice of system configuration parameters through the man-machine interface of the system software, including sampling rate, sampling length, trigger level, sampling amplitude range, phase calibration Offset and other related parameters; during the data acquisition process, the system displays the sampled original waveform and data in real time, and monitors the data acquisition status; the analysis function can select the original waveform data or the calculated PRPD map data according to the needs, and judge according to the partial discharge method Partial discharge identification and analysis with partial discharge source location method;

Utilize this device to carry out partial discharge judging method is: after described composite electric appliance partial discharge multi-information fusion diagnosis device 1 starts to work normally, described acquisition and analysis module 5 passes high-speed synchronous parallel data acquisition device 51, low-speed synchronous parallel data acquisition The device 52 simultaneously receives one or more of the ultra-high frequency signal, high-frequency current signal and ultrasonic signal coupled by the ultra-high frequency signal sensor 11, the high-frequency signal sensor 21, and the ultrasonic signal sensor 31. By comparing and analyzing similar acoustic and electrical signals and eliminating interference signals, it is possible to directly determine the existence of partial discharge in the gas insulated switch of the substation to be tested.

The partial discharge source positioning method of the diagnostic device is based on the amplitude or time difference of the multi-channel UHF signal of the device, the time difference between UHF and ultrasonic signals, or the time difference of multi-channel ultrasonic signals. The time difference is obtained based on the energy accumulation method, and the location of the partial discharge source includes preliminary location and precise location.

Claims (8)

1. Multi-information fusion diagnostic device for partial discharge of combined electrical appliances, characterized in that: UHF signal conversion module (1), high frequency signal conversion module (2), ultrasonic signal conversion module (3), power frequency signal conversion module (4 ) are connected with the collection and analysis module (5). 2. The multi-information fusion diagnostic device for partial discharge of combined electrical appliances according to claim 1, characterized in that: the UHF signal conversion module (1) includes a UHF signal sensor (11), a UHF signal conditioner (12), UHF signal wireless transmitter (13) and UHF signal wireless receiver (14); among them, UHF signal sensor (11), UHF signal conditioner (12, UHF signal The wireless transmitter (13) and the UHF signal wireless receiver (14) are connected sequentially, and the other end of the UHF signal wireless receiver (14) is connected to the high-speed synchronous parallel data collector (51); The high-frequency signal conversion module (2) includes a high-frequency signal sensor (21), a high-frequency signal conditioner (22), a high-frequency signal wireless transmitter (23) and a high-frequency signal wireless receiver (24); wherein, The high-frequency signal sensor (21), the high-frequency signal conditioner (22), the high-frequency signal wireless transmitter (23) and the high-frequency signal wireless receiver (24) are connected in sequence, and the other high-frequency signal wireless receiver (24) One end is connected with a high-speed synchronous parallel data collector (51); The ultrasonic signal conversion module (3) includes an ultrasonic signal sensor (31), an ultrasonic signal conditioner (32), an ultrasonic signal wireless transmitter (33) and an ultrasonic signal wireless receiver (34); wherein, the ultrasonic signal sensor (31 ), the ultrasonic signal conditioner (32), the ultrasonic signal wireless transmitter (33) and the ultrasonic signal wireless receiver (34) are connected sequentially, and the other end of the ultrasonic signal wireless receiver (34) is connected with the low-speed synchronous parallel data collector ( 52) connected; The power frequency signal conversion module (4) includes a power frequency signal sensor (41), a power frequency signal conditioner (42), a power frequency signal wireless transmitter (43) and a power frequency signal wireless receiver (44); wherein, The industrial frequency signal sensor (41), the industrial frequency signal conditioner (42), the industrial frequency signal wireless transmitter (43) and the industrial frequency signal wireless receiver (44), are connected in sequence, and the industrial frequency signal wireless receiver (44) The other end of the low-speed synchronous parallel data acquisition device (52) is connected; The collection and analysis module (5) includes a high-speed synchronous parallel data collector (51), a low-speed synchronous parallel data collector (52) and a notebook computer (53); wherein, the high-speed synchronous parallel data collector (51) and the low-speed synchronous parallel data collector The data collector (52) is installed in the same PXI rack, connected through the rack data bus, and connected to the network port of the notebook computer (53) through the PCIExpress interface. 3. The multi-information fusion diagnostic device for partial discharge of combined electrical appliances according to claim 2, characterized in that: after the signal detected by the UHF signal sensor (11) is processed by the UHF signal conditioner (12), sent by the UHF signal wireless transmitter (13) to the UHF signal wireless receiver (14), and then connected to the high-speed synchronous parallel data collector (51); The signal detected by the high-frequency signal sensor (21) is processed by the high-frequency signal conditioner (22), and sent by the high-frequency signal wireless transmitter (23) to the high-frequency signal wireless receiver (24), and then connected to High-speed synchronous parallel data acquisition device (51); After the signal detected by the ultrasonic signal sensor (31) is processed by the ultrasonic signal conditioner (32), it is sent by the ultrasonic signal wireless transmitter (33) to the ultrasonic signal wireless receiver (34), and then connected to the low-speed synchronous parallel data Collector (52); After the signal detected by the power frequency signal sensor (41) is processed by the power frequency signal conditioner (42), it is sent by the power frequency signal wireless transmitter (43) to the power frequency signal wireless receiver (44), and then connected to A low-speed synchronous parallel data collector (52); The high-speed synchronous parallel data collector (51) uses the partial discharge pulse signal itself as a trigger signal, and the trigger signal is synchronously output via the high-frequency coaxial shielded signal line through the trigger signal output port of the high-speed synchronous parallel data collector (51) To the trigger signal input port of the low-speed synchronous parallel data collector (52). 4. The multi-information fusion diagnostic device for partial discharge of combined electrical appliances according to claim 2, characterized in that: the detection bandwidth of the UHF signal sensor (11) is 300MHz-1500MHz, and the high frequency signal sensor (21 ) detection bandwidth is 0.5MHz-30MHz, the detection bandwidth of the ultrasonic signal sensor (31) is 20kHz-200kHz, and the power frequency signal sensor (41) is coupled to the power frequency voltage signal of the operating equipment under inspection. 5. The multi-information fusion diagnostic device for partial discharge of combined electrical appliances according to claim 2, characterized in that: the notebook computer (53) is equipped with a development system based on the LabVIEW virtual instrument platform, and the notebook computer (53) is responsible for control, processing, Analysis and display, provide the operator with the choice of system configuration parameters through the human-computer interaction interface of the system software, including sampling rate, sampling length, trigger level, sampling amplitude range, phase calibration offset and other related parameters; during data acquisition, The system displays the sampled original waveform and data in real time, and monitors the data acquisition status; the analysis function can select the original waveform data or the calculated PRPD map data according to the needs, and carry out the identification and analysis of partial discharge according to the partial discharge judgment method and the partial discharge source location method . 6. The diagnostic method using the multi-information fusion diagnostic device for partial discharge of combined electrical appliances as claimed in claim 1, characterized in that: when the diagnostic device starts to work normally, the acquisition and analysis module (5) collects data through high-speed synchronous parallel device (51), low-speed synchronous parallel data collector (52) simultaneously receive the UHF signal sensor (11), high frequency signal sensor (21), ultrasonic signal sensor (31) and power frequency signal sensor (41 ) coupled UHF signal, high frequency current signal and ultrasonic signal, by comparing and analyzing several types of acoustic and electrical signals and eliminating interference signals, it can be directly judged that the gas insulated switch of the substation to be tested has local discharge. 7. Utilize the diagnosis method of the partial discharge multi-information fusion diagnosis device of combined electric appliance as claimed in claim 6, it is characterized in that: the partial discharge source localization mode of described diagnosis device is based on the amplitude of the multi-channel UHF signal of this device Value or time difference, UHF and ultrasonic signal time difference or multi-channel ultrasonic signal time difference for positioning, the time difference is obtained based on the energy accumulation method. 8. The diagnosis method using the partial discharge multi-information fusion diagnosis device of combined electrical appliances according to claim 7, characterized in that: the partial discharge source location includes preliminary location and precise location.