Substation-wide wireless monitoring device

Abstract

The utility model discloses a transformer substation global wireless monitoring devices, include: a plurality of wireless acquisition system and analysis diagnosis background, and wireless acquisition system gathers partial discharge signal respectively, and all with analysis diagnosis background wireless connection, wireless acquisition system includes: power module, acquisition module and signal acquisition terminal, and acquisition module gathers partial discharge signal, and is connected with signal acquisition terminal through network cable, and power module is connected with signal acquisition terminal, and signal acquisition terminal is connected with analysis diagnosis background wireless, the utility model discloses through wireless acquisition system and analysis diagnosis background wireless connection, and the structure connection through the series connection topology between sensor, greatly reduces the redundant wiring, and signal exchange unit gathers sensor signal and passes through the UDP broadcast mode synchronization power grid frequency, realizes the power frequency phase synchronization, 4G / WIFI unit ensures partial discharge data synchronization transmission to the background, supports remote alarm and control, supports 220V power supply and lithium battery double -way power supply, guarantees the continuous monitoring.

Description

Technical Field

[0001] This utility model relates to the field of online partial discharge monitoring technology, and in particular to a wireless monitoring device for the entire substation area. Background Technology

[0002] Traditional substation GIS / GIL equipment monitoring systems have significant drawbacks: digital sensors lack analog interfaces and cannot directly obtain the real-time frequency of the power grid from the 220V power supply or PT, resulting in the partial discharge signal and the power frequency phase being unable to be accurately synchronized; wired transmission relies on a large number of cables, which makes construction difficult and maintenance costs high in high-voltage environments; and existing systems are unable to support high-speed wireless aggregation and remote diagnosis of multi-sensor data. Utility Model Content

[0003] The purpose of this invention is to provide a wireless monitoring device for the entire substation area, which solves the problems of inaccurate synchronization of power frequency phase, cable redundancy, and difficulty in multi-data fusion diagnosis in equipment monitoring systems.

[0004] The technical problem solved by this utility model is addressed by the following technical solution:

[0005] A substation full-area wireless monitoring device includes: several wireless acquisition systems and an analysis and diagnosis backend, wherein the wireless acquisition systems respectively acquire partial discharge signals and are all wirelessly connected to the analysis and diagnosis backend;

[0006] The wireless acquisition system includes a power module, an acquisition module, and a signal acquisition terminal. The acquisition module acquires partial discharge signals and is connected to the signal acquisition terminal. The power module is connected to the signal acquisition terminal, and the signal acquisition terminal is wirelessly connected to the analysis and diagnosis backend.

[0007] Preferably, the signal acquisition terminal includes: a signal exchange module, a control module, a synchronization module, and a WIFI module. The synchronization module is connected to the signal exchange module, the signal exchange module is connected to the control module, the control module is connected to the analysis and diagnosis backend through the WIFI module, the signal exchange module is connected to the acquisition module, and the digital frequency calculation module is connected to the power supply.

[0008] Preferably, the synchronization module includes: a power conversion unit, an analog-to-digital conversion unit, and a digital frequency calculation unit. The power conversion unit is connected to the power module and the acquisition module, respectively. The analog-to-digital conversion unit is connected to the power supply and the control module, respectively. The digital frequency calculation unit is connected to the analog-to-digital conversion unit and the control module, respectively.

[0009] Preferably, the acquisition module includes a sensor daisy chain, which is connected to the signal exchange module, and the sensor types include ultra-high frequency sensors, high frequency sensors, and ultrasonic sensors.

[0010] Preferably, the power module includes a lithium battery and a 220V maintenance power supply.

[0011] Preferably, the analysis and diagnosis backend includes: a data storage module, a map recognition module, a positioning module, and an alarm module.

[0012] Preferably, the ultrasonic sensor, high-frequency sensor, and ultra-high-frequency sensor are cascaded in a series topology.

[0013] Preferably, the signal exchange module is provided with several interfaces, which are respectively connected to the ultrasonic sensor, the high-frequency sensor and the ultra-high-frequency sensor, as well as the synchronization module.

[0014] Preferably, the sensor daisy chain includes: a plurality of digital sensors connected in series, the digital sensors being connected to a signal exchange module and powered by a power supply module.

[0015] Preferably, the analysis and diagnosis backend and signal acquisition terminal are also equipped with 4G network terminals.

[0016] This invention utilizes a wireless acquisition system and a wireless analysis and diagnostic backend for wireless connection. Sensors are connected via a series topology, greatly reducing redundant wiring. The wireless acquisition system is equipped with a signal exchange unit to acquire sensor signals and synchronize the power grid frequency via UDP broadcast, achieving microsecond-level power frequency phase synchronization. A 4G / WIFI unit ensures that partial discharge data is synchronously transmitted to the backend, supporting remote alarm and control. It supports dual power supply from 220V power and lithium battery to ensure continuous monitoring. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structural connection of this utility model;

[0018] Figure 2 This is a schematic diagram of the module connection of this utility model;

[0019] The markings in the diagram are as follows: 1-Wireless acquisition system; 2-Analysis and diagnosis backend; 3-Power module; 4-Acquisition module; 5-Signal acquisition terminal; 6-Signal exchange module; 7-Control module; 8-Synchronization module; 9-WIFI module; 10-Sensor daisy chain; 11-Digital sensor; 12-4G network terminal. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0021] A substation full-area wireless monitoring device includes: several wireless acquisition systems 1 and an analysis and diagnosis backend 2. The multiple wireless acquisition systems 1 respectively acquire partial discharge signals and are all wirelessly connected to the analysis and diagnosis backend 2 to form a broadband wireless communication network.

[0022] The wireless acquisition system 1 includes: a power module 3, an acquisition module 4, and a signal acquisition terminal 5. The acquisition module 4 acquires partial discharge signals and is connected to the signal acquisition terminal 5 via a network cable. The power module 3 is connected to the signal acquisition terminal 5, and the signal acquisition terminal 5 is wirelessly connected to the analysis and diagnosis backend 2.

[0023] In a further embodiment of this invention, the signal acquisition terminal 5 includes: a signal exchange module 6, a control module 7, a synchronization module 8, and a WIFI module 9. The synchronization module 8 integrates a GPS / BeiDou dual-mode clock chip and is connected to the signal exchange module 6. The signal exchange module 6 is connected to the control module 7. The control module 7 is based on an ARM Cortex-M7 processor, runs a real-time operating system to schedule data acquisition tasks, and is connected to the analysis and diagnosis backend 2 through the WIFI module 9. The signal exchange module 6 is connected to the acquisition module 4, and the digital frequency calculation module is connected to the power supply.

[0024] The signal exchange module 6 is an Ethernet switch that connects to the sensor daisy chain 10 via an RJ45 interface. It has Ethernet power supply and switch communication functions, and is connected to DC power from the power module 3 to provide power to the sensor daisy chain 10. It can also be cascaded to the next sensor in the daisy chain. It forms a local area network with all the devices in the daisy chain, and receives and distributes partial discharge detection data, power frequency phase synchronization information, and control commands from the analysis and diagnosis background 2.

[0025] The signal exchange module 6 is configured with 8 dedicated interfaces. Interfaces 1-3 are connected to UHF, HF, and ultrasonic sensor chains, respectively. Interface 4 is used for the dedicated gigabit fiber optic interface of the synchronization module 8. Interfaces 5-6 are used for cascading adjacent signal acquisition terminals 5. Interfaces 7-8 are spare expansion interfaces.

[0026] Synchronization module 8 acquires and converts the real-time frequency of the power grid into power frequency phase synchronization. Based on the UDP network protocol, it sends the real-time frequency of the power grid in digital form to the digital sensor 11 of the sensor daisy chain 10 via network broadcast. Then, the digital sensor 11 sends the partial discharge detection data containing the power frequency phase to the signal acquisition terminal 5 via the POE network cable, thus realizing the real-time synchronization of digital voltage frequency (power frequency phase).

[0027] In a further embodiment of this invention, the synchronization module 8 includes: a power conversion unit, an analog-to-digital conversion unit, and a digital frequency calculation unit. The power conversion unit is connected to the power module 3 and the acquisition module 4, respectively, and converts the 220V maintenance power supply into a 48V DC power supply to provide continuous power to the sensor daisy chain 10. The analog-to-digital conversion unit is connected to the power supply and the control module 7, respectively, and uses a 24-bit high-precision ADC to capture the power grid waveform at a sampling rate of 10kHz, converting the 220V voltage sine wave analog signal into a digital signal. The digital frequency calculation module is connected to the analog-to-digital conversion module and the control module 7, respectively, and uses the FFT algorithm to filter and analyze the sine wave digital signal to calculate the power grid frequency in real time.

[0028] In a further embodiment of this example, the acquisition module 4 includes a sensor daisy chain 10, which is connected to the signal exchange module 6. The sensor types include ultra-high frequency sensors, high frequency sensors, and ultrasonic sensors.

[0029] In a further embodiment of this invention, the power module 3 includes a lithium battery and a 220V maintenance power supply. The lithium battery is used in the event of a sudden power outage to ensure that the equipment continues to operate for a period of time and to prevent data loss.

[0030] A further implementation of this embodiment analyzes and displays the data analysis results of the integrated diagnostic backend 2, and displays the GIS / GIL status monitoring results on the software interface and alarm devices, which can be viewed remotely. Specifically, it includes a data storage module, a map recognition module, a positioning module, and an alarm module. The data storage module stores partial discharge data received from the wireless acquisition system 1; the map recognition module analyzes the partial discharge map to identify the discharge type and severity; the positioning module locates the discharge source based on multi-sensor data fusion; and the alarm module triggers local and remote alarm devices when an anomaly is detected, and supports remote access via 4G / WIFI network, enabling maintenance personnel to view monitoring data and alarm information in real time.

[0031] In a further embodiment of this invention, the ultrasonic sensor daisy chain 10, the high-frequency sensor daisy chain 10, and the ultra-high frequency sensor daisy chain 10 are cascaded in series topology. The ultra-high frequency daisy chain spacing is ≤5m, and they are connected in series through an SMA interface. The coaxial cable length of the high-frequency daisy chain is ≤3m. The ultrasonic daisy chain is connected through a shielded twisted pair daisy chain. The end of the ultrasonic daisy chain is equipped with a 120Ω terminating resistor to ensure signal integrity.

[0032] In a further embodiment of this invention, the signal exchange module 6 is provided with several interfaces, which are respectively connected to the ultrasonic sensor, the high-frequency sensor, and the ultra-high-frequency sensor, as well as the synchronization module 8.

[0033] In a further embodiment of this invention, the sensor daisy chain 10 includes: a plurality of digital sensors 11 connected in series, the digital sensors being connected to the interface of the signal exchange module 6 and powered by a 220V maintenance power supply or a lithium battery; the synchronization module 8 is located in the signal acquisition terminal 5 and communicates with the analysis and diagnosis backend 2 via a wireless connection.

[0034] The background diagnostic backend, signal acquisition terminal 5, and all digital sensors 11 form a global detection network through wired and wireless integration. Power grid frequency phase information, partial discharge detection data, and control commands issued by the analysis and diagnostic backend 2 can all be transmitted and responded to in real time.

[0035] In a further implementation of this embodiment, the analysis and diagnosis backend 2 and the signal acquisition terminal 5 are also equipped with a 4G network terminal 12, which allows maintenance personnel to remotely access and view detection data and alarm information in real time.

[0036] 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 monitoring device for the entire substation area, characterized in that, include: Several wireless acquisition systems and an analysis and diagnosis backend are provided. The wireless acquisition systems acquire partial discharge signals and are all wirelessly connected to the analysis and diagnosis backend. The wireless acquisition system includes a power module, an acquisition module, and a signal acquisition terminal. The acquisition module acquires partial discharge signals and is connected to the signal acquisition terminal. The power module is connected to the signal acquisition terminal, and the signal acquisition terminal is wirelessly connected to the analysis and diagnosis backend. The signal acquisition terminal includes: a signal exchange module, a control module, a synchronization module, and a WIFI module. The synchronization module is connected to the signal exchange module, the signal exchange module is connected to the control module, the control module is connected to the analysis and diagnosis backend through the WIFI module, and the signal exchange module is connected to the acquisition module. The signal switching module is an Ethernet switch, which is connected to the sensor daisy chain via an RJ45 interface. The signal switching module is equipped with 8 interfaces. Interfaces 1-3 are connected to the UHF, HF and ultrasonic sensor chains respectively; interface 4 is a dedicated gigabit fiber optic interface for the synchronization module 8; interfaces 5-6 are used to cascade adjacent signal acquisition terminals 5; and interfaces 7-8 are spare expansion interfaces. The synchronization module integrates a GPS / BeiDou dual-mode clock chip and is connected to the signal exchange module. The synchronization module includes a power conversion unit, an analog-to-digital converter (ADC), and a digital frequency calculation unit. The power conversion unit is connected to both the power supply module and the acquisition module, converting the 220V maintenance power supply to 48V DC power. The ADC is connected to both the power supply module and the control module, using a 24-bit ADC to capture the power grid waveform at a 10kHz sampling rate. The digital frequency calculation unit is connected to both the ADC and the control module. The acquisition module includes a sensor daisy chain, which is connected to the signal exchange module. The sensor types include ultra-high frequency sensors, high frequency sensors, and ultrasonic sensors. The power module includes a lithium battery and a 220V maintenance power supply.

2. The substation full-area wireless monitoring device according to claim 1, characterized in that, The control module is equipped with an ARM Cortex-M7 processor.

3. The substation full-area wireless monitoring device according to claim 1, characterized in that, The synchronization module transmits the real-time frequency of the power grid in digital form to the digital sensors in the daisy chain of the sensor via the UDP network protocol. The digital sensors then transmit partial discharge detection data, including the power frequency phase, to the signal acquisition terminal via a PoE network cable.

4. The substation full-area wireless monitoring device according to claim 1, characterized in that, The sensor daisy chain includes: several digital sensors connected in series, which are connected to a signal exchange module and powered by a power supply module.

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