GIS equipment partial discharge intelligent positioning detection device

Abstract

The utility model relates to a GIS equipment partial discharge intelligent positioning detection device based on an ultrahigh frequency detection method. The device is mainly composed of an ultrahigh frequency sensor, a coaxial cable, an electric power equipment partial discharge diagnosis positioning device and an electric power equipment partial discharge diagnosis positioning software operation platform. The device detects partial discharge defects and other information in GIS equipment through a built-in or external high-precision sensor, the information is transmitted to the electrical equipment partial discharge diagnosis and positioning device through a coaxial cable, data analysis is carried out, then the data is transmitted to electrical equipment partial discharge diagnosis and positioning software for analysis and processing, and waveform features are extracted. The partial discharge detection device has the advantages of real-time detection, accurate positioning, live detection, portability, detachability, simple operation, strong anti-interference capability and the like, improves the working efficiency of the partial discharge detection device and the service life of GIS equipment, and provides guarantee for maintaining safe and stable operation of an electric power system.

Description

Technical Field

[0001] The utility model belongs to the technical field of partial discharge detection, and particularly relates to a partial discharge detection device based on the ultra-high frequency detection method and applied to large gas insulated metal enclosed switchgear (GIS). Technical Background

[0002] When the gas insulated metal enclosed switchgear (GIS) operates normally in the power system, it can control and regulate current and voltage to ensure the stable operation of the power system. Timely diagnosis of whether partial discharge occurs in GIS is the basic guarantee for the safe and stable operation of the power system.

[0003] Nowadays, there are many detection methods for partial discharge, such as the following detection methods:

[0004] (1) Optical detection method

[0005] The optical detection method is to detect the light wave signal generated when partial discharge occurs inside the GIS, and then judge the strength of the partial discharge phenomenon. This method has strong anti-electromagnetic interference ability and high sensitivity, and can also realize partial discharge positioning according to the position where the light wave signal is generated. However, due to the complex and delicate manufacturing process of GIS, the optical detection method requires the installation of optoelectronic sensors inside the GIS in advance, which consumes a large cost and may also affect the gas insulation performance inside the GIS, greatly affecting the production and manufacturing of normal equipment. Therefore, the optical detection method is not applicable to the existing operating GIS equipment and is mostly used in the R & D, design and optimization of GIS in laboratories.

[0006] (2) Gas detection method

[0007] The gas detection method is to detect the content and composition changes of the insulating gas inside the GIS to judge the occurrence of partial discharge phenomenon and the strength of partial discharge signal. The GIS is filled with SF6 gas with excellent insulation performance and arc extinguishing performance. The SF6 gas has extremely strong stability and a large number of negative ions. When partial discharge occurs in the GIS, a high-temperature arc will be generated, which will decompose the SF6 gas inside the GIS. The occurrence of partial discharge is judged by analyzing the chemical substances inside the GIS, and the type of partial discharge can be judged according to the content of different chemical substances generated by decomposition. The decomposition products of SF6 gas will accelerate the aging of the basin insulators of GIS and affect the insulation performance of the insulators.

[0008] (3) Ultrasonic detection method

[0009] When partial discharge occurs in GIS, ultrasonic signals in the range of 20 kHz to 200 kHz will be generated. By collecting and analyzing the ultrasonic signals, the type and location of partial discharge can be determined. Ultrasonic waves belong to mechanical waves, which are not affected by electromagnetic signals and are not shielded by the isolating electrical circuit of GIS. Since the propagation speed of ultrasonic waves is relatively slow, it is easier to find the specific location where partial discharge occurs in GIS. Due to the slow propagation rate of ultrasonic signals in SF6 gas, significant attenuation will occur, and the propagation law inside GIS is also very complex. Therefore, the ultrasonic detection method is mainly used as an auxiliary means in current on-site applications. Generally, the ultrasonic detection method is used for partial discharge location in actual applications.

[0010] (4) Mechanical vibration method

[0011] Installing high-sensitivity acceleration sensors on the outer wall of GIS can detect the shell vibration caused by partial discharge inside GIS. This detection method is called the mechanical vibration method. However, this method is greatly affected by environmental noise interference, and the mechanical actions of switches during the normal operation of GIS will also affect the detection effect. Therefore, when using the mechanical vibration method for partial discharge detection, it is necessary to perform noise reduction processing on the vibration signal to remove the interference of its own vibration signal and environmental noise. The contact state of the disconnector contacts in GIS can be judged by studying the vibration signals of GIS equipment. Although loose contacts will cause floating discharge phenomena, poor contact of contacts is a mechanical fault and is generally not used to judge partial discharge faults in GIS.

[0012] (5) Pulse current detection method

[0013] The pulse current detection method detects the pulse current released during partial discharge in GIS through a coupling capacitor. To obtain accurate partial discharge detection results using this method, an accurately matched impedance is required. This method is greatly affected by environmental factors. There is often a large amount of environmental noise at the application site of GIS. Therefore, it is usually used for partial discharge detection in laboratories.

[0014] (6) Ultra High Frequency (UHF) detection method

[0015] In current power equipment fault diagnosis, the UHF method is mostly used to detect, locate and identify the fault types of partial discharge defects. The UHF detection technology realizes the judgment of the strength of partial discharge, the fault type and the severity of the fault by detecting the strength and waveform of the UHF electromagnetic wave signals generated during the partial discharge of power equipment. The detection frequency band of the UHF detection method is 300 - 3000 MHz, which is higher than the general electromagnetic wave frequency, and has strong anti-interference ability and high detection sensitivity, etc. Since the electromagnetic wave signals cannot propagate along the metal outer wall of the GIS, they will spread out along the gaps of the pot-type insulators between each gas chamber interval. Therefore, the UHF signal detection is generally realized by installing sensors inside the GIS or on the external pot-type insulators to judge the occurrence of partial discharge phenomena. The UHF detection technology is a relatively mature technology in the current application of partial discharge diagnosis. By detecting the signal characteristics of the UHF signals inside the GIS, the partial discharge type is judged to assist in the health state diagnosis of the GIS.

[0016] Therefore, it is very necessary and important to develop a reliable and efficient partial discharge detection device. Summary of the Utility Model

[0017] Aiming at the deficiencies of the existing technology, the utility model provides a GIS equipment partial discharge intelligent positioning detection device, which is easy to install, can reduce the manual workload, can perform data analysis and processing in real time, and is efficient, accurate and has strong anti-interference ability, improving the working efficiency of the partial discharge detection device and the service life of the switchgear.

[0018] In order to achieve the above purpose, the technical solution of the utility model is:

[0019] The GIS equipment partial discharge intelligent positioning detection device based on the UHF partial discharge detection method includes a UHF sensor, a coaxial cable, a power equipment partial discharge diagnosis and positioning device, and a power equipment partial discharge diagnosis and positioning software operation console.

[0020] The partial discharge defects and other information in the GIS equipment are detected by an internal or external high-precision sensor, and the information is transmitted to the power equipment partial discharge diagnosis and positioning device through the coaxial cable. After data analysis, it is transmitted to the power equipment partial discharge diagnosis and positioning software for analysis and processing to extract waveform features. This sampling process uses 4-channel synchronous sampling, with a sampling bandwidth of up to 1.5 GHz and a sampling rate of 6.25 GS / s. Then, through the product software for analysis and processing, a complete time-domain waveform is obtained from the sampling signal. According to the differences in the PRPD and PRPS spectra between different discharges and noises, the partial discharge signals are accurately extracted, and algorithms such as automatic separation of noise interference are applied to separate the partial discharge signals to obtain partial discharge information.

[0021] On the front panel of the partial discharge diagnosis and location device for power equipment, there are an intelligent display screen, a fault indicator light, and a USB interface; the USB interface is connected to the operation console of the partial discharge diagnosis and location software for power equipment.

[0022] Preferably, the UHF sensor is used to capture the UHF pulse signals generated by partial discharge inside the GIS equipment; the four-channel synchronous acquisition circuit is connected to the UHF sensor to achieve multi-channel synchronous acquisition; the four channels are connected to an amplifier, the amplifier is connected to a filter, and the filter is connected to an oscilloscope to make the waveform features prominent.

[0023] Preferably, the operation console of the partial discharge diagnosis and location software for power equipment includes a noise interference elimination module and a data analysis and processing software module. The noise interference elimination module includes a deep learning processor and a clustering separation algorithm module; the deep learning processor is used to execute the noise and discharge signal separation algorithm based on deep learning, and the clustering separation algorithm module classifies the separated signals for multi-source signals to provide accurate information and data.

[0024] Preferably, the data analysis and processing software module includes a JAVA GIS library, a convolutional neural network recognition module, and a time difference of arrival method location module; the JAVA GIS library is used to generate PRPD diagrams and PRPS diagrams, the convolutional neural network recognition module is trained based on the data after image preprocessing and is used to determine whether partial discharge occurs in the GIS equipment, and the time difference of arrival method location module uses the principle of multiple local discharge signals and the time difference of arrival method to achieve precise location of the discharge part.

[0025] The technical effects and advantages of the present utility model:

[0026] 1. The present utility model realizes high-precision data acquisition. By using a UHF sensor, it can capture the UHF electromagnetic wave band signals generated by partial discharge in the GIS equipment. The 4-channel synchronous acquisition technology is used to ensure the integrity and real-time nature of signal acquisition. The sampling bandwidth of up to 1.5 GHz and the sampling rate of 6.25 GS / s provide a basis for fine waveform analysis. The sampling resolution reaches 12 bits, providing rich details for data analysis.

[0027] 2. The multi-dimensional comprehensive diagnosis function of the device of the present utility model can timely detect weak discharge signals in the early stage of a fault and issue a warning. This timely warning mechanism helps to reduce sudden failures of equipment and improve the operation stability and reliability of the equipment. It achieves fault warning and reduction of sudden failures.

[0028] 3. The UHF signal of the present utility model has strong anti-interference ability and high detection sensitivity, and cannot propagate along the outer wall of the GIS metal, but is transmitted outwards along the gaps of the pot-type insulators between the air chambers. This enables the device to perform partial discharge detection under the live state of the equipment, realizing live detection and avoiding the economic losses caused by power-off detection.

[0029] 4. The equipment of the present utility model is simply connected. Just connect the sensor, detection box and laptop computer to start the measurement. The computer software interface equipped is simple and easy to operate, without special training. The box-type designed equipment is portable and detachable, convenient for carrying and operation. It effectively saves manpower, material resources and financial resources, and also avoids the problems of large volume, heavy weight and difficult handling of traditional detection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural diagram of the partial discharge detection device of the present utility model;

[0031] Figure 2 is a schematic internal structural diagram of the partial discharge diagnosis and location device for electrical equipment of the present utility model;

[0032] Figure 3 is a schematic external structural diagram of the partial discharge diagnosis and location device for electrical equipment of the present utility model;

[0033] Figure 4 is a schematic diagram of the signal transmission and processing path of the present utility model.

[0034] Reference numerals in the figures: 1, UHF sensor; 2, coaxial cable; 3, partial discharge diagnosis and location device for electrical equipment; 4, software operation console for partial discharge diagnosis and location of electrical equipment; 31, system board; 32, graphics card; 33, oscilloscope; 34, amplifier; 35, filter; 301, detachable housing; 302, equipment fault indicator light; 303, multi-USB interface; 331, oscilloscope display screen; 332, operation channel A; 333, operation channel B; 334, operation channel C; 335, operation channel D; 336, coaxial cable connection port; 337, waveform adjustment area. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following embodiments given in conjunction with the drawings further illustrate the present utility model in detail.

[0036] A GIS equipment partial discharge intelligent location detection device of the present application is mainly used for detecting the presence or absence of partial discharge, the intensity of partial discharge and the accurate partial discharge position of gas-insulated metal-enclosed switchgear, and can also be used for partial discharge detection of other primary switchgear.

[0037] See Figure 1As shown in the figure, an intelligent positioning and detection device for partial discharge of GIS equipment proposed in this example includes a UHF sensor 1, a coaxial cable 2, an electrical equipment partial discharge diagnosis and positioning device 3, and an electrical equipment partial discharge diagnosis and positioning software operation console 4. The UHF sensor 1 is connected to the coaxial cable 2, the coaxial cable 2 is connected to the electrical equipment partial discharge diagnosis and positioning device 3, and the electrical equipment partial discharge diagnosis and positioning device 3 is connected to the electrical equipment partial discharge diagnosis and positioning software operation console 4.

[0038] Among them, the sensor 1 is a UHF sensor, which is responsible for collecting the electrical signals of the current; the coaxial cable 2 is responsible for connecting the GIS equipment to the electrical equipment partial discharge diagnosis and positioning device 3; the electrical equipment partial discharge diagnosis and positioning device 3 is responsible for displaying and analyzing the discharge signals and displaying the collected discharge waveforms; the electrical equipment partial discharge diagnosis and positioning software operation console 4 is responsible for analyzing the waveforms and visualizing the analysis results.

[0039] In one embodiment, as shown in Figure 2 the figure, the electrical equipment partial discharge diagnosis and positioning device 3 includes a system board 31, a graphics card 32, an oscilloscope 33, an amplifier 34, and a filter 35; the system board 31 is connected to the graphics card 32 and the oscilloscope 33, the graphics card 32 is connected to the system board 31 and the oscilloscope 33, the amplifier 34 and the filter 35 are connected, and the filter 35 and the oscilloscope 33 are connected.

[0040] Among them, as shown in Figure 3 the figure, the oscilloscope 33 is provided with an oscilloscope display screen 331, an arithmetic channel A 332, an arithmetic channel B 333, an arithmetic channel C 334, an arithmetic channel D 335, a coaxial cable connection port 336, and a waveform adjustment area 337.

[0041] Among them, as shown in Figure 4 the figure, the arithmetic channel A 332, the arithmetic channel B 333, the arithmetic channel C 334, and the arithmetic channel D 335 are connected to the amplifier 34, the amplifier 34 is connected to the filter 35, and the filter 35 is connected to the oscilloscope 33.

[0042] This application adopts four-channel synchronous calculation of the arithmetic channel A 332, the arithmetic channel B 333, the arithmetic channel C 334, and the arithmetic channel D 335, and after being processed by the amplifier, it is transmitted to the filter, and finally the waveform is displayed by the oscilloscope, which greatly improves the operation efficiency while ensuring the waveform accuracy rate.

[0043] In one embodiment, as shown in Figure 3 the figure, the electrical equipment partial discharge diagnosis and positioning device 3 includes an oscilloscope 33 and a detachable housing 301, and the oscilloscope 33 is connected to the detachable housing 301.

[0044] Due to its detachable nature, during inspections, the staff can carry each part separately, and when the equipment is being repaired, it can also be inspected separately.

[0045] In one embodiment, an intelligent partial discharge location detection device for a GIS device includes an electrical equipment partial discharge diagnosis and location software operation console 4.

[0046] If it is necessary to adjust the information to be measured of the device under test, the inspection personnel can directly set the parameters on the electrical equipment partial discharge diagnosis and location software operation console 4. At the same time, the electrical equipment partial discharge diagnosis and location software operation console 4 effectively filters out the interference of environmental noise, and its display screen can display the PRPD and PRPS maps of the partial discharge signal in real time, and can accurately locate the discharge position. The inspection personnel can directly read the discharge position information from the electrical equipment partial discharge diagnosis and location software operation console 4, improving the inspection efficiency.

[0047] In one embodiment, as shown in Figure 3 On the front of the electrical equipment partial discharge diagnosis and location device (3), there is an oscilloscope (33), a detachable housing (301), a device fault indicator light (302), and a multi-USB interface (303).

[0048] Among them, the multi-USB interface (303) is connected to the electrical equipment partial discharge diagnosis and location software operation console 4.

[0049] This application realizes an improvement in the automation and intelligence level of partial discharge detection through the electrical equipment partial discharge diagnosis and location device 3. The staff only needs to connect the electrical equipment partial discharge diagnosis and location device 3 to the GIS device that needs to be detected. When it is operating normally and no partial discharge occurs, only the PRPD, PRPS maps and alarm information displayed on the electrical equipment partial discharge diagnosis and location software operation console 4 need to be monitored in real time. If the data fluctuates greatly before the electrical equipment partial discharge diagnosis and location software operation console 4 issues a fault alarm, the cause of the data fluctuation needs to be immediately found, and potential factors that may cause partial discharge need to be eliminated to prevent the occurrence of partial discharge in advance.

[0050] If a partial discharge occurs, the electrical equipment partial discharge diagnosis and location software operation console 4 will send an alarm signal. Then the staff needs to cut off the power of the GIS device immediately, remove the partial discharge detection device from the GIS device, and invite professional maintenance personnel to repair the partial discharge fault point until the cause of the fault is eliminated before the GIS device can be restored to power.

[0051] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several modifications and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. An intelligent positioning detection device for partial discharge of GIS equipment, characterized in that: it includes a UHF sensor (1), a coaxial cable (2), an electrical equipment partial discharge diagnosis and positioning device (3) and an electrical equipment partial discharge diagnosis and positioning software operation console (4). The UHF sensor (1) is connected to the coaxial cable (2), the coaxial cable (2) is connected to the electrical equipment partial discharge diagnosis and positioning device (3), and the electrical equipment partial discharge diagnosis and positioning device (3) is connected to the electrical equipment partial discharge diagnosis and positioning software operation console (4); a system board (31), a graphics card (32) and an oscilloscope (33) are provided inside the electrical equipment partial discharge diagnosis and positioning device (3); the system board (31) is connected to the graphics card (32) and the oscilloscope (33), and the graphics card (32) is connected to the system board (31) and the oscilloscope (33); the front of the electrical equipment partial discharge diagnosis and positioning device (3) is provided with an oscilloscope (33), a detachable housing (301), an equipment fault indicator light (302) and a multi-USB interface (303).

2. The intelligent positioning detection device for partial discharge of GIS equipment according to claim 1, characterized in that: the oscilloscope (33) is provided with an oscilloscope display screen (331), an arithmetic channel A (332), an arithmetic channel B (333), an arithmetic channel C (334), an arithmetic channel D (335), a coaxial cable connection port (336), and a waveform adjustment area (337).

3. The intelligent positioning detection device for partial discharge of GIS equipment according to claim 2, characterized in that: the arithmetic channel A (332), the arithmetic channel B (333), the arithmetic channel C (334), and the arithmetic channel D (335) are connected to an amplifier (34), the amplifier (34) is connected to a filter (35), and the filter (35) is connected to the oscilloscope (33).

4. The intelligent positioning detection device for partial discharge of GIS equipment according to claim 1, characterized in that: the electrical equipment partial discharge diagnosis and positioning device (3) includes a multi-USB interface (303), and the multi-USB interface (303) is connected to the electrical equipment partial discharge diagnosis and positioning software operation console (4).

5. The intelligent positioning detection device for partial discharge of GIS equipment according to claim 1, characterized in that: an amplifier (34) and a filter (35) are further provided inside the electrical equipment partial discharge diagnosis and positioning device (3).

6. The intelligent positioning detection device for partial discharge of GIS equipment according to claim 1, characterized in that: the electrical equipment partial discharge diagnosis and positioning device (3) includes an oscilloscope (33) and a detachable housing (301), and the oscilloscope (33) is connected to the detachable housing (301).

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