A wireless partial discharge detection device for GIS AC voltage withstand test

Abstract

The utility model discloses a wireless partial discharge detection device for GIS ac withstand voltage test, include: acquisition unit, wireless transmission unit, signal processing unit and background diagnosis platform, and acquisition unit obtains partial discharge signal and exports to signal processing unit through wireless transmission unit, and signal processing unit is connected with background diagnosis platform through wireless transmission unit, still include battery component, and battery component is connected with acquisition unit, wireless transmission unit and signal processing unit, the utility model can realize wireless collection partial discharge data and wireless data transmission and storage, and battery component has reduced the cable connection between equipment greatly, has improved the field work efficiency and security greatly, has avoided the threat of high -voltage induction electricity to personnel and equipment, has provided uniform time reference for front -end acquisition unit through wireless transmission unit, has realized the time difference positioning of multiple sensor signals, and has positioned the discharge source position accurately.

Description

Technical Field

[0001] This utility model relates to the field of partial discharge detection technology, and in particular to a wireless partial discharge detection device for AC withstand voltage testing of GIS. Background Technology

[0002] Gas-insulated switchgear (GIS) is the core equipment of ultra-high voltage and extra-high voltage substations. Its insulation reliability is directly related to the safe operation of the entire power grid. AC withstand voltage testing is a key step in verifying the insulation performance of the equipment. During withstand voltage testing, extremely high power frequency electromagnetic fields and transient overvoltages exist on site. These long cables are highly susceptible to coupling with high-voltage induced current, which not only causes serious interference to the detection signal but also poses a threat of electric shock to operators.

[0003] Large GIS substations are massive in scale, with numerous and widely distributed basin-type insulators. Laying hundreds of meters of cable is a labor-intensive and time-consuming task, greatly reducing testing efficiency. Cable penetration through walls and holes is also extremely inconvenient; long cables are easily damaged or stretched in complex field environments, leading to unreliable connections or signal interruptions, affecting the continuity and accuracy of testing. Utility Model Content

[0004] The purpose of this invention is to provide a wireless partial discharge detection device for AC withstand voltage testing of GIS, which solves the problem that long cables in withstand voltage testing can easily cause serious interference to the detection signal.

[0005] The technical problem solved by this utility model is addressed by the following technical solution:

[0006] A wireless partial discharge detection device for AC withstand voltage testing of GIS includes: a data acquisition unit, a wireless transmission unit, a signal processing unit, and a background diagnostic platform. The data acquisition unit acquires partial discharge signals and outputs them to the signal processing unit through the wireless transmission unit. The signal processing unit is connected to the background diagnostic platform through the wireless transmission unit.

[0007] It also includes a battery assembly, which is connected to the acquisition unit, the wireless transmission unit and the signal processing unit;

[0008] The wireless transmission unit includes a clock module, a first communication module, and a second communication module. The first communication module is located within the acquisition unit, and the second communication module is located within the signal processing unit. The first communication module and the second communication module are wirelessly connected. The clock module is connected to the signal processing unit and also to the first and second communication modules. The second communication module is wirelessly connected to the background diagnostic platform.

[0009] Preferably, the acquisition unit includes an ultra-high frequency sensor, a high frequency sensor, and an ultrasonic sensor. The ultra-high frequency sensor, the high frequency sensor, and the ultrasonic sensor are powered by the battery assembly and connected to the signal processing unit through the first communication module to output a partial discharge signal.

[0010] Preferably, the first communication module includes: a first LoRa module, a first ZigBee module, or a first 4G / 5G module.

[0011] Preferably, the second communication module includes: a second LoRa module, a second ZigBee module, or a second 4G / 5G module.

[0012] Preferably, the battery assembly includes a lithium polymer battery, a solar charging panel, and an external charging interface. The solar charging panel and the external charging interface are connected to the lithium polymer battery, and the lithium polymer battery is connected to the acquisition unit, the wireless transmission unit, and the signal processing unit.

[0013] Preferably, the signal processing unit includes a signal amplifier, a bandpass filter, and a high-speed analog-to-digital converter connected in sequence.

[0014] Preferably, it further includes a storage unit, which is connected to the signal processing unit.

[0015] Preferably, the ultra-high frequency sensor, the high frequency sensor, and the ultrasonic sensor are respectively plugged into the acquisition unit.

[0016] Preferably, the clock module is a BeiDou satellite timing module.

[0017] Preferably, the background diagnostic platform has a built-in analysis algorithm module.

[0018] This invention enables the acquisition unit, signal processing unit, and back-end diagnostic platform to wirelessly acquire, transmit, and store partial discharge data. It can be quickly deployed at any detection point in a GIS. The battery component greatly reduces the number of cables between devices, significantly improving on-site work efficiency and safety, and avoiding the threat of high-voltage induced electricity to personnel and equipment. It is suitable for rapid testing in GIS substations. The wireless transmission unit provides a unified time reference for the front-end acquisition unit, enabling multi-sensor signal arrival time difference positioning and accurate location of the discharge source. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structural connection of this utility model;

[0020] The markings in the diagram are as follows: 1-Acquisition unit; 2-Signal processing unit; 3-Wireless transmission unit; 4-Battery assembly; 5-Back-end diagnostic platform; 6-Clock module; 7-First communication module; 8-Second communication module. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0022] A wireless partial discharge detection device for AC withstand voltage testing of GIS includes: a data acquisition unit 1, a wireless transmission unit 3, a signal processing unit 2 for conditioning and analog-to-digital conversion of the signal, and a background diagnostic platform 5. The data acquisition unit 1 acquires the partial discharge signal and outputs it to the signal processing unit 2 through the wireless transmission unit 3. The signal processing unit 2 is connected to the background diagnostic platform 5 through the wireless transmission unit 3.

[0023] It also includes a battery assembly 4, which is connected to the acquisition unit 1, the wireless transmission unit 3 and the signal processing unit 2.

[0024] The wireless transmission unit 3 includes: a clock module 6 for providing a precise synchronization time reference, a first communication module 7 and a second communication module 8. The first communication module 7 is located in the acquisition unit 1, and the second communication module 8 is located in the signal processing unit 2. The first communication module 7 and the second communication module 8 are wirelessly connected. The clock module 6 is connected to the signal processing unit 2 and to the first communication module 7 and the second communication module 8. The second communication module 8 is wirelessly connected to the background diagnostic platform 5.

[0025] In a further embodiment of this invention, the acquisition unit 1 includes an ultra-high frequency sensor, a high frequency sensor, and an ultrasonic sensor. The ultra-high frequency sensor, the high frequency sensor, and the ultrasonic sensor are powered by the battery assembly 4 and connected to the signal processing unit 2 through the first communication module 7 to output a partial discharge signal.

[0026] The acquisition unit 1 is the signal sensing front end of the device. In this embodiment, the acquisition unit 1 integrates a high-frequency sensor and an ultrasonic sensor to form a multi-technology fusion detection front end. The ultra-high frequency sensor is used to sense the 300MHz~1.5GHz electromagnetic wave signal radiated by partial discharge at the GIS basin insulator; the high-frequency sensor is a Rogowski coil used to detect the high-frequency pulse current signal in the grounding wire; and the ultrasonic sensor is used to receive the ultrasonic signal generated by partial discharge.

[0027] The ultra-high frequency sensor, high frequency sensor, and ultrasonic sensor are encapsulated in the same metal shielding housing. They can also be modular probes that can be flexibly plugged into the host of the acquisition unit 1 according to the field detection requirements, so as to realize the on-demand configuration of functions.

[0028] In a further embodiment of this example, the first communication module includes: a first LoRa module, a first ZigBee module, or a first 4G / 5G module.

[0029] In a further embodiment of this example, the second communication module includes: a second LoRa module, a second ZigBee module, or a second 4G / 5G module.

[0030] Specifically, LoRa modules are used to connect the front-end acquisition unit and signal transmission unit to achieve low-power, long-distance synchronization and data aggregation; 4G / 5G modules are used to transmit the data aggregated to the signal processing unit to the back-end diagnostic platform to achieve remote, high-speed data interaction.

[0031] In a further embodiment of this invention, the battery assembly 4 includes a lithium polymer battery, a solar charging panel, and an external charging interface. The solar charging panel and the external charging interface are connected to the lithium polymer battery, and the lithium polymer battery is connected to the acquisition unit 1, the wireless transmission unit 3, and the signal processing unit 2.

[0032] In a further embodiment of this invention, the signal processing unit includes: a signal amplifier, a bandpass filter, and a high-speed analog-to-digital converter connected in sequence. The signal amplifier amplifies the weak signal transmitted from the acquisition unit 1. The bandpass filter is used to filter out interference noise outside the operating frequency band. The high-speed analog-to-digital converter converts the analog signal into a digital signal.

[0033] In a further embodiment of this invention, a storage unit is also included for storing the acquired partial discharge data. The storage unit is connected to the signal processing unit 2 to ensure that the partial discharge data is not lost when wireless communication is unstable.

[0034] In a further embodiment of this invention, the ultra-high frequency sensor, the high frequency sensor, and the ultrasonic sensor are respectively plugged into the acquisition unit 1.

[0035] In a further implementation of this embodiment, clock module 6 is a BeiDou satellite timing module.

[0036] Specifically, the first communication module 7 is a first LoRa module, which sends the collected partial discharge data from the field sensor to the signal processing unit 2; the clock module 6 is preferably a GPS / BeiDou satellite timing module, which can obtain absolute time with microsecond-level accuracy from the satellite. The clock module 6 is connected to the signal processing unit 2 and periodically broadcasts precise synchronization pulse signals to all acquisition units 1 through the second communication module 8 and the first communication module 7, ensuring that the acquisition units 1 at each location of the GIS maintain clock synchronization, laying the foundation for subsequent partial discharge source location and phase analysis.

[0037] In a further implementation of this embodiment, the background diagnostic platform 5 has a built-in analysis algorithm module. The analysis algorithm module reconstructs a phase-resolved partial discharge map based on the time-stamped partial discharge data and locates the discharge source based on the arrival time difference of the signals from the multiple acquisition units 1.

[0038] A further implementation of this embodiment follows the following workflow: During the AC withstand voltage test of the GIS, the operator arranges several acquisition units 1 at each detection point, and the battery assembly 4 powers the entire system. The partial discharge signals sensed by each sensor are amplified, filtered, and digitized by the signal processing unit 2, and then sent by the first communication module 7 to the second communication module 8. Simultaneously, the clock module 6 ensures that the partial discharge data is tagged with a unified time stamp. The partial discharge data can be stored in the storage unit and transmitted to the background diagnostic platform 5 for real-time analysis and diagnosis, thereby safely, efficiently, and accurately completing the insulation status assessment of the GIS equipment.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A wireless partial discharge detection device for AC withstand voltage testing of GIS, characterized in that, include: The system includes a data acquisition unit, a wireless transmission unit, a signal processing unit, and a background diagnostic platform. The data acquisition unit acquires partial discharge signals and outputs them to the signal processing unit via the wireless transmission unit. The signal processing unit is connected to the background diagnostic platform via the wireless transmission unit. It also includes a battery assembly, which is connected to the acquisition unit, the wireless transmission unit and the signal processing unit; The wireless transmission unit includes a clock module, a first communication module, and a second communication module. The first communication module is located within the acquisition unit, and the second communication module is located within the signal processing unit. The first communication module and the second communication module are wirelessly connected. The clock module is connected to the signal processing unit and also to the first and second communication modules. The second communication module is wirelessly connected to the background diagnostic platform.

2. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, The acquisition unit includes an ultra-high frequency sensor, a high frequency sensor, and an ultrasonic sensor. The ultra-high frequency sensor, high frequency sensor, and ultrasonic sensor are powered by the battery assembly and connected to the signal processing unit through the first communication module to output partial discharge signals.

3. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, The first communication module includes: a first LoRa module, a first ZigBee module, and a first 4G / 5G module.

4. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, The second communication module includes: a second LoRa module, a second ZigBee module, and a second 4G / 5G module.

5. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, The battery assembly includes a lithium polymer battery, a solar charging panel, and an external charging interface. The solar charging panel and the external charging interface are connected to the lithium polymer battery, and the lithium polymer battery is connected to the acquisition unit, the wireless transmission unit, and the signal processing unit.

6. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, The signal processing unit includes a signal amplifier, a bandpass filter, and a high-speed analog-to-digital converter connected in sequence.

7. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, It also includes a storage unit, which is connected to the signal processing unit.

8. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 2, characterized in that, The ultra-high frequency sensor, high frequency sensor, and ultrasonic sensor are respectively plugged into the acquisition unit.

9. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, The clock module is a BeiDou satellite timing module.

10. The wireless partial discharge detection device for AC withstand voltage testing of GIS according to claim 1, characterized in that, The background diagnostic platform has a built-in analysis algorithm module.

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