GIS Flange UHF Online Monitoring System and Method Based on Wireless Communication

Abstract

The present invention discloses a GIS flange UHF on-line monitoring system and method based on wireless communication, including a GIS flange housing, a UHF partial discharge sensor, a UHF signal processing module, an SF6 gas leakage on-line monitoring and alarm module, a wireless transmission module, a data aggregation device, and a main control computer terminal. This method collects the UHF partial discharge signals generated by partial discharges inside the GIS, monitors the SF6 concentration signals in the gas cavity, and when the monitored value of the SF6 concentration signal exceeds the safety threshold, activates the SF6 alarm unit to issue an alarm; the main control computer terminal receives and displays the UHF partial discharge signals and the SF6 concentration signals, and at the same time issues signal instructions to control the sleep and start of the UHF signal processing module and the SF6 gas leakage on-line monitoring and alarm module.

Description

Technical Field

[0001] The present invention relates to the on-line monitoring technology of power equipment, and particularly to a GIS flange UHF on-line monitoring system based on wireless communication. Background Art

[0002] Gas insulated switchgear (GIS) consists of a circuit breaker, disconnector, earthing switch, transformer, arrester, busbar, etc. All the devices are enclosed in a metal earthed enclosure, and a certain pressure of SF6 insulating gas is filled inside. It has the advantages of small floor space, long maintenance cycle, convenient transportation and installation, etc., and has been widely used at home and abroad. Investigations have found that the vast majority of GIS faults are insulation faults. Therefore, effective monitoring and early warning of abnormal discharges in GIS are of great significance for ensuring the safe operation of equipment and power systems.

[0003] At present, the main methods for detecting partial discharges in GIS are the pulse current method, high-frequency current method, ultra-high frequency method, ultrasonic method, etc. Among them, the ultra-high frequency (UHF) method couples the electromagnetic mode waves formed by discharge excitation through a radio frequency antenna. Due to its high sensitivity, strong anti-interference ability and the ability to be used for identifying partial discharge types, etc., it is currently widely used in the detection of partial discharges in electrical equipment. The ultra-high frequency (UHF) signals generated by partial discharges in GIS are usually detected through built-in sensors or external sensors. The built-in UHF sensors have the characteristics of high sensitivity and strong anti-interference ability, and are currently the standard configuration for on-line monitoring of GIS equipment with high voltage levels.

[0004] The main types of built-in ultra-high frequency sensors are ring-shaped, conical and circular plate-shaped sensors. The detection frequency band range is 300 MHz - 3 GHz. They are usually installed inside the GIS flange, and the power supply and signal lines are led out from the flange interface. In recent years, with the increasing installation amount of built-in ultra-high frequency sensors in GIS, investigations have found that the proportion of air leakage faults caused by poor design of built-in ultra-high frequency sensors in GIS or poor flange sealing technology in GIS equipment failures is relatively high. Therefore, in order to ensure stable and effective acquisition of the real-time operating state of GIS equipment, it is necessary to propose a highly reliable on-line monitoring device for partial discharges of the flange without changing the original equipment structure and airtight performance of GIS. Summary of the Invention

[0005] The purpose of the present invention is to provide a GIS flange UHF on-line monitoring system and method based on wireless communication, which can realize on-line monitoring of GIS partial discharges and SF6 gas leakage of GIS flanges without changing the original equipment structure and airtight performance of GIS, and has the advantages of high sensitivity and good reliability.

[0006] To achieve this purpose, a GIS flange UHF online monitoring system based on wireless communication designed by the present invention includes a UHF partial discharge sensor, a UHF signal processing module, and a wireless transmission module; the UHF partial discharge sensor is used to collect UHF partial discharge signals generated by internal partial discharges in the GIS and transmit the UHF partial discharge signals to the UHF signal processing module; the UHF signal processing module is used to convert the UHF partial discharge signals into UHF partial discharge digital signals and transmit the UHF partial discharge digital signals to the wireless transmission module; the wireless transmission module is used to receive and transmit the UHF partial discharge digital signals.

[0007] A GIS flange UHF online monitoring method based on wireless communication includes the following steps:

[0008] Collect UHF partial discharge signals generated by internal partial discharges in the GIS, convert the UHF partial discharge signals into UHF partial discharge digital signals, and transmit the UHF partial discharge digital signals to the wireless transmission module;

[0009] Monitor the SF6 concentration signal in the gas cavity, convert the SF6 concentration signal into an SF6 concentration digital signal, and transmit the SF6 concentration digital signal to the wireless transmission module. When the monitored value of the SF6 concentration digital signal exceeds the safety threshold, start the SF6 alarm unit to issue an alarm;

[0010] Receive the signal instruction issued by the main control computer terminal, and the UHF signal processing module and the SF6 gas leakage online monitoring and alarm module perform sleep and startup according to the signal instruction; wherein, the signal instruction is generated by the main control computer terminal according to the UHF partial discharge digital signal and the SF6 concentration digital signal, and the main control computer terminal receives the UHF partial discharge digital signal and the SF6 concentration digital signal transmitted by the wireless transmission module through the data aggregation device.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. By means of wireless communication, it reduces the loosening of flange interfaces caused by wired disturbances, resulting in SF6 gas leakage, and does not change the original structure of the GIS equipment, with strong applicability.

[0013] 2. Monitor the SF6 gas concentration of the GIS flange, can monitor the airtightness of the flange at any time, and remind the operation and maintenance personnel to perform maintenance operations in time through an alarm.

[0014] 3. The partial discharge online monitoring system for GIS flanges has a bilateral communication function, realizes both collection and control of the system, and can simultaneously monitor multiple GIS flanges to accurately locate and eliminate faults. Brief Description of the Drawings

[0015] Figure 1 It is the system structure diagram of the present invention;

[0016] Figure 2 It is the structural schematic diagram of the ultra-high frequency signal processing module;

[0017] Figure 3 It is the structural schematic diagram of the on-line monitoring and alarm module for SF6 gas leakage;

[0018] Figure 4 It is the two-way communication flow chart of the system.

[0019] Among them, 1 - GIS flange, 2 - GIS flange housing, 3 - ultra-high frequency partial discharge sensor, 4 - lead wire, 5 - ultra-high frequency signal processing module, 6 - on-line monitoring and alarm module for SF6 gas leakage, 7 - wireless transmission module, 8 - epoxy resin, 9 - data aggregation device, 10 - main control computer terminal, 51 - protection unit, 52 - ultra-high frequency signal acquisition unit, 53 - ultra-high frequency signal filtering unit, 54 - ultra-high frequency signal amplification unit, 55 - ultra-high frequency signal A / D converter, 56 - ultra-high frequency signal communication unit, 57 - ultra-high frequency module power supply unit, 61 - SF6 gas sensor, 62 - SF6 gas signal amplification unit, 63 - SF6 gas signal A / D converter, 64 - SF6 alarm unit, 65 - SF6 concentration signal communication unit, 66 - SF6 module power supply unit. Detailed Embodiment

[0020] The following further elaborates on the present invention in conjunction with the drawings and specific embodiments:

[0021] A GIS flange UHF on-line monitoring system based on wireless communication, as Figures 1 to 4 shown, it includes: GIS flange housing 2, ultra-high frequency partial discharge sensor 3, ultra-high frequency signal processing module 5, on-line monitoring and alarm module 6 for SF6 gas leakage, wireless transmission module 7, data aggregation device 9, main control computer terminal 10;

[0022] The ultra-high frequency partial discharge sensor 3 is used to collect the ultra-high frequency partial discharge signals generated by the internal partial discharge of the GIS and transmit the ultra-high frequency partial discharge signals to the ultra-high frequency signal processing module 5;

[0023] The ultra-high frequency signal processing module 5 is used to convert the ultra-high frequency partial discharge signals into ultra-high frequency partial discharge digital signals and transmit the ultra-high frequency partial discharge digital signals to the wireless transmission module 7;

[0024] The GIS flange housing 2 is closely attached to the GIS flange 1 to form a gas cavity;

[0025] The on-line monitoring and alarm module 6 for SF6 gas leakage is used to monitor the SF6 concentration signal in the gas cavity, convert the SF6 concentration signal into a digital SF6 concentration signal, and transmit the digital SF6 concentration signal to the wireless transmission module 7. When the monitored value of the digital SF6 concentration signal exceeds the safety threshold, the SF6 alarm unit is activated to issue an alarm;

[0026] The wireless transmission module 7 is used to send the UHF partial discharge digital signal and the digital SF6 concentration signal to the data aggregation module 9;

[0027] The data aggregation device 9 sends the collected UHF partial discharge digital signal and the digital SF6 concentration signal to the main control computer terminal 10;

[0028] The main control computer terminal 10 is used to receive and display the UHF partial discharge digital signal and the digital SF6 concentration signal, and at the same time issue a signal command to control the sleep and startup of the UHF signal processing module 5 and the on-line monitoring and alarm module 6 for SF6 gas leakage.

[0029] In the above technical solution, the UHF partial discharge sensor 3 is installed inside the GIS flange and is cast with the lead wire 4 through the epoxy resin 8, which plays a role of isolation and sealing;

[0030] The UHF partial discharge sensor 3 is selected as a coupled antenna circular plate type sensor.

[0031] In the above technical solution, such as Figure 2As shown in the figure, the ultra-high frequency (UHF) signal processing module 5 includes an input protection unit 51, a UHF signal acquisition unit 52, a UHF signal filtering unit 53, a UHF signal amplification unit 54, a UHF signal A / D converter 55, a UHF signal communication unit 56, and a UHF module power supply unit 57. The input protection unit 51 is used to prevent the input from being broken down by instantaneous high voltage. The UHF signal acquisition unit 52 is used to acquire UHF partial discharge signals. The UHF signal filtering unit 53 is used to filter the UHF partial discharge signals. The UHF signal amplification unit 54 is used to amplify the UHF partial discharge signals. The UHF signal A / D converter 55 is used to convert the UHF partial discharge signals into UHF partial discharge digital signals. The operating frequency band of the UHF signal acquisition unit 52 is 300 MHz - 3 GHz. The UHF signal communication unit 56 transmits the UHF partial discharge digital signals to the wireless transmission module 7. The UHF module power supply unit 57 is used to supply power to the input protection unit 51, the UHF signal acquisition unit 52, the UHF signal filtering unit 53, the UHF signal amplification unit 54, the UHF signal A / D converter 55, and the UHF signal communication unit 56;

[0032] The UHF signal communication module 56 has a two-way communication function.

[0033] In the above technical solution, the GIS flange housing 2 is fixed on the GIS flange 1 through an elastic fixing band. The elastic fixing edge is provided with a strong rubber ring for fixing on the bolts of the GIS flange 1;

[0034] The GIS flange housing 2 includes an SF6 gas leakage on-line monitoring and alarm module 6 and a wireless transmission module 7.

[0035] In the above technical solution, as Figure 3 shown, the SF6 gas leakage on-line monitoring and alarm module 6 includes an SF6 gas sensor 61, an SF6 concentration signal amplification unit 62, an SF6 concentration signal A / D converter 63, an SF6 alarm unit 64, an SF6 concentration signal communication unit 65, and an SF6 module power supply unit 66. The SF6 gas sensor 61 uses an SF6 absorption material to transmit the SF6 concentration signal in the gas cavity to the SF6 concentration signal amplification unit 62. The SF6 concentration signal A / D converter 63 converts the SF6 concentration signal into an SF6 concentration digital signal through an A / D converter and transmits the SF6 concentration digital signal to the SF6 concentration signal communication unit 65;

[0036] The SF6 concentration signal communication unit 65 has a two-way communication function, as Figure 4 shown;

[0037] The SF6 alarm unit 64 is connected to the SF6 concentration signal communication unit 65;

[0038] When the monitored value of the SF6 concentration digital signal exceeds the safety threshold, it indicates that SF6 gas leakage has occurred at the GIS flange, and the SF6 alarm unit 64 is activated to issue an alarm. The alarm uses a buzzer to facilitate the operation and maintenance personnel to discover the fault;

[0039] The on-line monitoring and alarm module 6 for SF6 gas leakage is fixed inside the GIS flange housing 2.

[0040] In the above technical solution, the UHF signal processing module 5 and the on-line monitoring and alarm module 6 for SF6 gas leakage transmit signals to the wireless transmission module 7 through the communication unit. The wireless transmission module 7 uses RF radio frequency or wifi or LoRa or ZigBee communication.

[0041] In the above technical solution, the data aggregation device 9 includes a signal acquisition module, a data communication module, and a power supply module. The signal acquisition module is communicatively connected to the wireless transmission module 7, and transmits the received UHF partial discharge digital signal and the SF6 concentration digital signal to the main control computer terminal 10 through the data communication module.

[0042] In the above technical solution, the main control computer terminal 10 has a bilateral communication function.

[0043] A method for on-line monitoring of GIS flange UHF based on wireless communication, characterized in that it includes the following steps:

[0044] Collect the UHF partial discharge signals generated by partial discharge inside the GIS, convert the UHF partial discharge signals into UHF partial discharge digital signals, and transmit the UHF partial discharge digital signals to the wireless transmission module 7;

[0045] Monitor the SF6 concentration signal in the gas cavity, convert the SF6 concentration signal into an SF6 concentration digital signal, and transmit the SF6 concentration digital signal to the wireless transmission module 7. When the monitored value of the SF6 concentration digital signal exceeds the safety threshold, activate the SF6 alarm unit to issue an alarm;

[0046] Receives the signal instructions sent by the master control computer terminal 10, and the UHF signal processing module 5 and the SF6 gas leakage on-line monitoring and alarm module 6 go into sleep and start up according to the signal instructions; wherein, the signal instructions are generated by the master control computer terminal 10 according to the UHF partial discharge digital signal and the SF6 concentration digital signal, and the master control computer terminal 10 receives the UHF partial discharge digital signal and the SF6 concentration digital signal sent by the wireless transmission module 7 through the data aggregation device 9.

[0047] The content not detailed in this specification belongs to the prior art well-known to those skilled in the art. Those skilled in the art should understand that the embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0048] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0049] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means realizes the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0050] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide means for realizing the functions specified in Figure 1 one process or multiple processes and / or blocksFigure 1 Steps of functions specified in one or more boxes.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the scope of its protection. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that after reading the present invention, various changes, modifications or equivalent replacements can still be made to the specific implementation manners of the invention, but these changes, modifications or equivalent replacements are all within the scope of protection of the claims pending for the invention.

Claims

1. A GIS flange UHF online monitoring system based on wireless communication, characterized in that, Including: Ultra-high frequency partial discharge sensor (3), ultra-high frequency signal processing module (5), wireless transmission module (7); The ultra-high frequency partial discharge sensor (3) is used to collect the ultra-high frequency partial discharge signals generated by internal partial discharge of GIS and transmit the ultra-high frequency partial discharge signals to the ultra-high frequency signal processing module (5); The ultra-high frequency signal processing module (5) is used to convert the ultra-high frequency partial discharge signals into ultra-high frequency partial discharge digital signals and transmit the ultra-high frequency partial discharge digital signals to the wireless transmission module (7); The wireless transmission module (7) is used to receive and transmit the ultra-high frequency partial discharge digital signals; The GIS flange UHF online monitoring system further includes a GIS flange housing (2): The GIS flange housing (2) is closely attached to the GIS flange (1) to form a gas cavity; The GIS flange housing (2) includes an SF6 gas leakage online monitoring and alarm module (6) and a wireless transmission module (7); The SF6 gas leakage online monitoring and alarm module (6) is used to monitor the SF6 concentration signal in the gas cavity.

2. The wireless communication-based GIS flange UHF online monitoring system according to claim 1, characterized in that: The ultra-high frequency partial discharge sensor (3) is installed inside the GIS flange and is cast with a lead wire (4) through epoxy resin (8); The ultra-high frequency partial discharge sensor (3) is a coupled antenna circular plate type sensor.

3. The wireless communication-based GIS flange UHF online monitoring system according to claim 1, characterized in that: The ultra-high frequency signal processing module (5) includes an input protection unit (51), an ultra-high frequency signal acquisition unit (52), an ultra-high frequency signal filtering unit (53), an ultra-high frequency signal amplification unit (54), an ultra-high frequency signal A / D converter (55), an ultra-high frequency signal communication unit (56), and an ultra-high frequency module power supply unit (57); The input protection unit (51) is used to prevent instantaneous high voltage from breaking down the input; The ultra-high frequency signal acquisition unit (52) is used to collect ultra-high frequency partial discharge signals; The ultra-high frequency signal filtering unit (53) is used to filter the ultra-high frequency partial discharge signals; The ultra-high frequency signal amplification unit (54) is used to amplify the ultra-high frequency partial discharge signals; The ultra-high frequency signal A / D converter (55) is used to convert the ultra-high frequency partial discharge signals into ultra-high frequency partial discharge digital signals; The ultra-high frequency signal communication unit (56) transmits the ultra-high frequency partial discharge digital signals to the wireless transmission module (7); The ultra-high frequency module power supply unit (57) is used to supply power to the input protection unit (51), the ultra-high frequency signal acquisition unit (52), the ultra-high frequency signal filtering unit (53), the ultra-high frequency signal amplification unit (54), the ultra-high frequency signal A / D converter (55), and the ultra-high frequency signal communication unit (56).

4. The GIS flange UHF online monitoring system based on wireless communication according to claim 1, characterized in that, The GIS flange housing (2) is fixed on the GIS flange (1) by an elastic fixing band, and a strong rubber ring is provided at the edge of the elastic fixing band, and the strong rubber ring is used to be fixed on the bolts of the GIS flange (1).

5. The GIS flange UHF online monitoring system based on wireless communication according to claim 4, characterized in that: The GIS flange UHF online monitoring system further includes an SF6 gas leakage online monitoring and alarm module (6): Converting the SF6 concentration signal into an SF6 concentration digital signal, and transmitting the SF6 concentration digital signal to the wireless transmission module (7). When the monitored value of the SF6 concentration digital signal exceeds the safety threshold, the SF6 alarm unit is activated to issue an alarm; the wireless transmission module (7) receives and transmits the SF6 concentration digital signal; The SF6 gas leakage online monitoring and alarm module (6) includes an SF6 gas sensor (61), an SF6 concentration signal amplification unit (62), an SF6 concentration signal A / D converter (63), an SF6 alarm unit (64), an SF6 concentration signal communication unit (65), and an SF6 module power supply unit (66); The SF6 gas sensor (61) transmits the SF6 concentration signal in the gas cavity to the SF6 concentration signal amplification unit (62) by using an SF6 absorption material. The SF6 concentration signal A / D converter (63) converts the SF6 concentration signal into an SF6 concentration digital signal through an A / D converter, and transmits the SF6 concentration digital signal to the SF6 concentration signal communication unit (65); The SF6 concentration signal communication unit (65) has a two-way communication function; The SF6 alarm unit (64) is connected to the SF6 concentration signal communication unit (65); when the monitored value of the SF6 concentration digital signal exceeds the safety threshold, the SF6 alarm unit (64) is activated to issue an alarm to remind the surrounding staff and avoid the health hazards caused by gas leakage; The SF6 gas leakage online monitoring and alarm module (6) is fixed inside the GIS flange housing (2).

6. The GIS flange UHF online monitoring system based on wireless communication according to claim 5, characterized in that: The ultra-high frequency signal processing module (5) and the SF6 gas leakage online monitoring and alarm module (6) transmit signals to the wireless transmission module (7) through a communication unit, and the wireless transmission module (7) uses RF radio frequency, wifi, LoRa or ZigBee communication.

7. The GIS flange UHF online monitoring system based on wireless communication according to claim 5, characterized in that: The GIS flange UHF online monitoring system further includes a data aggregation device (9); The data aggregation device (9) includes a signal acquisition module, a data communication module, and a power supply module. The signal acquisition module is communicatively connected to the wireless transmission module (7), and transmits the received ultra-high frequency partial discharge digital signal and the SF6 concentration digital signal to the main control computer terminal (10) through the data communication module.

8. The GIS flange UHF on-line monitoring system based on wireless communication according to claim 5, characterized in that: The GIS flange UHF on-line monitoring system further includes a main control computer terminal (10); The main control computer terminal (10) is used to receive and display the UHF partial discharge digital signal and the SF6 concentration digital signal, and at the same time issue a signal command to control the sleep and startup of the UHF signal processing module (5) and the SF6 gas leakage on-line monitoring and alarm module (6); The main control computer terminal (10) has a bilateral communication function.

9. A GIS flange UHF online monitoring method based on wireless communication using the system described in claim 1, characterized in that, It includes the following steps: Collect the UHF partial discharge signal generated by the partial discharge inside the GIS; Convert the UHF partial discharge signal into a UHF partial discharge digital signal; Transmit the UHF partial discharge digital signal to the wireless transmission module (7); Monitor the SF6 concentration signal in the gas cavity, convert the SF6 concentration signal into an SF6 concentration digital signal, and transmit the SF6 concentration digital signal to the wireless transmission module (7); When the monitored value of the SF6 concentration digital signal exceeds the safety threshold, start the SF6 alarm unit to issue an alarm; Receive the signal command issued by the main control computer terminal (10), and the UHF signal processing module (5) and the SF6 gas leakage on-line monitoring and alarm module (6) perform sleep and startup according to the signal command; wherein, the signal command is generated by the main control computer terminal (10) according to the UHF partial discharge digital signal and the SF6 concentration digital signal, and the main control computer terminal (10) receives the UHF partial discharge digital signal and the SF6 concentration digital signal sent by the wireless transmission module (7) through the data aggregation device (9).

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