A multi-channel synchronous acquisition device for monitoring surge arresters

Abstract

This utility model relates to the field of surge arrester monitoring technology, and more particularly to a multi-channel synchronous acquisition device for surge arrester monitoring. Its technical solution includes: a signal conditioning module, a multi-channel acquisition module, a synchronization control module, a data processing module, a data storage module, a data transmission module, and a power supply module. The synchronization control module includes a synchronization clock chip and a GPS module; the data processing module includes a microcontroller; the data storage module includes a storage medium and a storage interface circuit; and the data transmission module includes a wired transmission interface and a wireless transmission module. This utility model supports wide voltage input and multiple types of monitoring signals, is adaptable to surge arresters of different voltage levels, and supports remote parameter configuration, eliminating the need for on-site debugging, reducing maintenance costs, and improving the applicability of the equipment. Through the high-precision clock and GPS synchronization settings of the synchronization control module, the real-time operating status of multiple surge arresters can be accurately compared, avoiding analysis errors caused by time differences.

Description

Technical Field

[0001] This utility model relates to the field of surge arrester monitoring technology, and in particular to a multi-channel synchronous acquisition device for surge arrester monitoring. Background Technology

[0002] Surge arresters are core components in power systems that suppress overvoltages and protect electrical equipment. Their operating status directly affects the safety and stability of the power system. To prevent damage to surge arresters due to aging, moisture, internal breakdown, or other faults, their operating status needs to be monitored in real time.

[0003] Currently, most existing surge arrester monitoring devices employ a single-channel acquisition and polling switching method. This involves sequentially switching between multiple surge arresters using a single acquisition unit to monitor multiple devices. However, this method suffers from time differences during polling switching, preventing the simultaneous acquisition of monitoring data from multiple arresters. This results in a lack of temporal correlation in the data, making it difficult to compare and analyze the coordinated operation of multiple arresters, and exhibiting poor synchronization. Furthermore, the polling period increases with the number of arresters, failing to meet the demands of high-frequency monitoring and leading to low acquisition efficiency. In addition, while some multi-channel acquisition devices can achieve parallel acquisition of multiple signals, the substation environment where surge arresters are located contains significant electromagnetic radiation, and existing devices lack effective signal conditioning mechanisms, resulting in high noise and low accuracy in the acquired data. Therefore, we propose a multi-channel synchronous acquisition device for surge arrester monitoring. Utility Model Content

[0004] The purpose of this invention is to address the problems existing in the background technology by proposing a multi-channel synchronous acquisition device for monitoring surge arresters.

[0005] The technical solution of this utility model is as follows: A multi-channel synchronous acquisition device for monitoring surge arresters, comprising a signal conditioning module, a multi-channel acquisition module, a synchronization control module, a data processing module, a data storage module, a data transmission module, and a power supply module. The signal conditioning module includes at least eight independently configured conditioning units, the multi-channel acquisition module includes at least eight independently configured acquisition units, the synchronization control module includes a synchronization clock chip and a GPS module, the data processing module includes a microcontroller, the data storage module includes a storage medium and a storage interface circuit, and the data transmission module includes a wired transmission interface and a wireless transmission module.

[0006] Preferably, the input terminal of each conditioning unit is connected to a monitoring sensor of a surge arrester. The conditioning unit includes a low-pass filter circuit, a differential amplifier circuit, and an opto-isolation circuit connected in series. The input terminal of the low-pass filter circuit serves as the input terminal of the conditioning unit, the output terminal of the opto-isolation circuit serves as the output terminal of the conditioning unit, the output terminal of the low-pass filter circuit is connected to the input terminal of the differential amplifier circuit, the output terminal of the differential amplifier circuit is connected to the input terminal of the opto-isolation circuit, and the output terminal of the opto-isolation circuit is connected to the input terminal of the corresponding acquisition unit in the multi-channel acquisition module.

[0007] Preferably, the input terminal of each acquisition unit is connected to the output terminal of a conditioning unit in the signal conditioning module, the synchronization control terminal of each acquisition unit is connected to the synchronization signal output terminal of the synchronization control module, and the data output terminal of each acquisition unit is connected to the acquisition data input terminal of the data processing module.

[0008] Preferably, the time signal output terminal of the GPS module is connected to the external synchronization input terminal of the synchronization clock chip, the reference clock output terminal of the synchronization clock chip is connected to the clock input terminal of the multi-channel acquisition module, and the synchronization pulse output terminal of the synchronization clock chip is connected to the synchronization control terminal of the multi-channel acquisition module.

[0009] Preferably, the microcontroller's data input terminal is connected to the data output terminal of the multi-channel acquisition module, the microcontroller's storage control terminal is connected to the control terminal of the data storage module, the microcontroller's communication terminal is connected to the communication terminal of the data transmission module, and the microcontroller's synchronization configuration terminal is connected to the configuration terminal of the synchronization control module.

[0010] Preferably, the storage medium is an SD card, one end of the storage interface circuit is connected to the storage medium, and the other end of the storage interface circuit is connected to the storage control terminal of the data processing module.

[0011] Preferably, the wired transmission interface is an Ethernet RJ45 interface, the wireless transmission module is a 4G module, one end of the wired transmission interface is connected to the communication end of the data processing module, and the other end of the wired transmission interface is used to connect to an external monitoring platform. One end of the wireless transmission module is connected to the communication end of the data processing module, and the other end of the wireless transmission module is used for wireless communication with the external monitoring platform.

[0012] Preferably, the output terminals of the power module are electrically connected to the power input terminals of the signal conditioning module, the multi-channel acquisition module, the synchronization control module, the data processing module, the data storage module, and the data transmission module, respectively.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects:

[0014] This invention supports wide voltage input and multiple types of monitoring signals, adapting to surge arresters of different voltage levels. It also supports remote parameter configuration, eliminating the need for on-site debugging, reducing maintenance costs, and improving equipment applicability. Through the high-precision clock and GPS synchronization settings of the synchronous control module, the real-time operating status of multiple surge arresters can be accurately compared, avoiding analysis errors caused by time differences. At the same time, through the three-level processing of filtering, amplification, and isolation in the signal conditioning module, combined with surge protection in the power supply module, electromagnetic interference and voltage fluctuations in the substation can be effectively suppressed, improving anti-interference capabilities. With dual protection through local SD card storage and remote transmission, even if the transmission link is interrupted, historical data can be retrieved through the SD card, avoiding the loss of critical information and ensuring high data security. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Reference numerals in the attached diagram: 1. Signal conditioning module; 11. Conditioning unit; 2. Multi-channel acquisition module; 21. Acquisition unit; 3. Synchronization control module; 31. Synchronization clock chip; 32. GPS module; 4. Data processing module; 41. Microcontroller; 5. Data storage module; 51. Storage medium; 52. Storage interface circuit; 6. Data transmission module; 61. Wired transmission interface; 62. Wireless transmission module; 7. Power supply module. Detailed Implementation

[0017] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0018] Example

[0019] like Figure 1As shown, this utility model proposes a multi-channel synchronous acquisition device for surge arrester monitoring, including a signal conditioning module 1, a multi-channel acquisition module 2, a synchronous control module 3, a data processing module 4, a data storage module 5, a data transmission module 6, and a power supply module 7. The signal conditioning module 1 includes at least eight independently configured conditioning units 11, each with its input terminal connected to a surge arrester monitoring sensor. Each conditioning unit 11 includes a low-pass filter circuit, a differential amplifier circuit, and an opto-isolation circuit connected in series. The low-pass filter circuit uses an RC active filter structure to filter out high-frequency electromagnetic noise. The differential amplifier circuit uses an instrumentation amplifier. The weak monitoring signal can be amplified to the range that the acquisition module 2 can recognize. The opto-isolation circuit uses an optocoupler chip, which can realize electrical isolation between the sensor side and the device side and suppress common-mode interference. The input of the low-pass filter circuit is used as the input of the conditioning unit 11, and the output of the opto-isolation circuit is used as the output of the conditioning unit 11. The output of the low-pass filter circuit is connected to the input of the differential amplifier circuit, and the output of the differential amplifier circuit is connected to the input of the opto-isolation circuit. The setting of 1, through the three-level processing of filtering, amplification and isolation, combined with the surge protection in the power module 7, can effectively suppress the electromagnetic interference and voltage fluctuation of the substation and improve the anti-interference capability.

[0020] The multi-channel acquisition module 2 includes at least eight independently configured acquisition units 21. Each acquisition unit 21 uses a 16-bit resolution analog-to-digital converter chip. The output of the opto-isolation circuit is connected to the input of the corresponding acquisition unit 21 in the multi-channel acquisition module 2. The input of each acquisition unit 21 is connected to the output of a conditioning unit 11 in the signal conditioning module 1. The synchronization control terminal of each acquisition unit 21 is connected to the synchronization signal output of the synchronization control module 3. The data output terminal of each acquisition unit 21 is connected to the data input of the data processing module 4. The cooperative configuration of the acquisition units 21 and the synchronization control module 3 can receive synchronization trigger signals and achieve parallel acquisition.

[0021] The synchronization control module 3 includes a synchronization clock chip 31 and a GPS module 32. The time signal output terminal of the GPS module 32 is connected to the external synchronization input terminal of the synchronization clock chip 31. The reference clock output terminal of the synchronization clock chip 31 is connected to the clock input terminal of the multi-channel acquisition module 2. The synchronization pulse output terminal of the synchronization clock chip 31 is connected to the synchronization control terminal of the multi-channel acquisition module 2.

[0022] The data processing module 4 includes a microcontroller 41. The data input terminal of the microcontroller 41 is connected to the data output terminal of the multi-channel acquisition module 2. The storage control terminal of the microcontroller 41 is connected to the control terminal of the data storage module 5. The communication terminal of the microcontroller 41 is connected to the communication terminal of the data transmission module 6. The synchronization configuration terminal of the microcontroller 41 is connected to the configuration terminal of the synchronization control module 3. The microcontroller 41 uses a moving average filtering algorithm to further remove residual noise. At the same time, it corrects the system error of analog-to-digital conversion through the built-in calibration coefficient and converts the acquired data into a standardized format for easy storage and transmission.

[0023] The data storage module 5 includes a storage medium 51 and a storage interface circuit 52. The storage medium 51 is an SD card. One end of the storage interface circuit 52 is connected to the storage medium 51, and the other end of the storage interface circuit 52 is connected to the storage control terminal of the data processing module 4. The data storage module 5 can write the processed collected data to the SD card in real time. The storage period is configurable and supports cyclic overwriting.

[0024] The data transmission module 6 includes a wired transmission interface 61 and a wireless transmission module 62. The wired transmission interface 61 is an Ethernet RJ45 interface, and the wireless transmission module 62 is a 4G module. One end of the wired transmission interface 61 is connected to the communication end of the data processing module 4, and the other end of the wired transmission interface 61 is used to connect to an external monitoring platform. One end of the wireless transmission module 62 is connected to the communication end of the data processing module 4, and the other end of the wireless transmission module 62 is used for wireless communication with the external monitoring platform. The data transmission module 6 can upload the collected data to the remote monitoring platform in real time, and also supports remote wake-up and parameter configuration.

[0025] The output terminals of power module 7 are electrically connected to the power input terminals of signal conditioning module 1, multi-channel acquisition module 2, synchronous control module 3, data processing module 4, data storage module 5, and data transmission module 6, respectively. Power module 7 adopts a wide voltage input and integrates surge protection circuit, switching power supply chip and low dropout voltage regulator to provide stable power supply for the entire device and adapt to the voltage fluctuation environment at the substation site.

[0026] In this embodiment, the device is connected to the DC24V power supply of the substation. The power module 7 outputs 3.3V, 5V and 12V voltages. Each module is powered on and initialized. The GPS module 32 in the synchronization control module 3 searches for satellite signals, so that the synchronization clock chip 31 generates a PPS signal synchronized with UTC time.

[0027] The leakage current sensor of the surge arrester outputs a signal and is connected to the signal conditioning module 1. The signal is first filtered out by a low-pass filter circuit to remove high-frequency noise above 50kHz, then amplified by the conditioning unit 11, and finally output to the acquisition unit 21 after opto-isolation by the opto-isolation circuit.

[0028] The synchronous control module 3 outputs 1 PPS signal per second, triggering 8 acquisition units 21 to start AD conversion simultaneously, converting the analog signal into a 16-bit digital signal. The data processing module 4 reads the digital signal from the 8 acquisition units 21 through the SPI interface, uses moving average filtering to remove residual noise, and then calculates the actual monitoring value based on the pre-calibrated coefficients.

[0029] The processed data is written to the storage medium 51 through the SDIO interface, and simultaneously uploaded to the remote monitoring platform through the wired transmission interface 61 or the wireless transmission module 62. The remote monitoring platform can send instructions to the device through TCP or IP protocols, such as adjusting the sampling rate and setting the data storage period.

[0030] If the 4G or Ethernet link is interrupted, the device will automatically temporarily store the data in the storage medium 51 and automatically retransmit the historical data after the link is restored to ensure that the data is not lost.

[0031] The above-described specific embodiments are merely preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above-described specific embodiments.

Claims

1. A multi-channel synchronous acquisition device for monitoring surge arresters, comprising a signal conditioning module (1), a multi-channel acquisition module (2), a synchronous control module (3), a data processing module (4), a data storage module (5), a data transmission module (6), and a power supply module (7), characterized in that: The signal conditioning module (1) includes at least 8 independently configured conditioning units (11), the multi-channel acquisition module (2) includes at least 8 independently configured acquisition units (21), the synchronization control module (3) includes a synchronization clock chip (31) and a GPS module (32), the data processing module (4) includes a microcontroller (41), the data storage module (5) includes a storage medium (51) and a storage interface circuit (52), and the data transmission module (6) includes a wired transmission interface (61) and a wireless transmission module (62).

2. The multi-channel synchronous acquisition device for monitoring surge arresters according to claim 1, characterized in that, Each of the conditioning units (11) has its input terminal connected to a monitoring sensor of a surge arrester. The conditioning unit (11) includes a low-pass filter circuit, a differential amplifier circuit, and an opto-isolation circuit connected in series. The input terminal of the low-pass filter circuit serves as the input terminal of the conditioning unit (11), and the output terminal of the opto-isolation circuit serves as the output terminal of the conditioning unit (11). The output terminal of the low-pass filter circuit is connected to the input terminal of the differential amplifier circuit, and the output terminal of the differential amplifier circuit is connected to the input terminal of the opto-isolation circuit. The output terminal of the opto-isolation circuit is connected to the input terminal of the corresponding acquisition unit (21) in the multi-channel acquisition module (2).

3. The multi-channel synchronous acquisition device for monitoring surge arresters according to claim 1, characterized in that, The input terminal of each acquisition unit (21) is connected to the output terminal of a conditioning unit (11) in the signal conditioning module (1). The synchronization control terminal of each acquisition unit (21) is connected to the synchronization signal output terminal of the synchronization control module (3). The data output terminal of each acquisition unit (21) is connected to the acquisition data input terminal of the data processing module (4).

4. A multi-channel synchronous acquisition device for monitoring surge arresters according to claim 1, characterized in that, The time signal output terminal of the GPS module (32) is connected to the external synchronization input terminal of the synchronization clock chip (31), the reference clock output terminal of the synchronization clock chip (31) is connected to the clock input terminal of the multi-channel acquisition module (2), and the synchronization pulse output terminal of the synchronization clock chip (31) is connected to the synchronization control terminal of the multi-channel acquisition module (2).

5. A multi-channel synchronous acquisition device for monitoring surge arresters according to claim 1, characterized in that, The data input terminal of the microcontroller (41) is connected to the data output terminal of the multi-channel acquisition module (2), the storage control terminal of the microcontroller (41) is connected to the control terminal of the data storage module (5), the communication terminal of the microcontroller (41) is connected to the communication terminal of the data transmission module (6), and the synchronization configuration terminal of the microcontroller (41) is connected to the configuration terminal of the synchronization control module (3).

6. A multi-channel synchronous acquisition device for monitoring surge arresters according to claim 1, characterized in that, The storage medium (51) is an SD card. One end of the storage interface circuit (52) is connected to the storage medium (51), and the other end of the storage interface circuit (52) is connected to the storage control terminal of the data processing module (4).

7. A multi-channel synchronous acquisition device for monitoring surge arresters according to claim 1, characterized in that, The wired transmission interface (61) is an Ethernet RJ45 interface, and the wireless transmission module (62) is a 4G module. One end of the wired transmission interface (61) is connected to the communication end of the data processing module (4), and the other end of the wired transmission interface (61) is used to connect to an external monitoring platform. One end of the wireless transmission module (62) is connected to the communication end of the data processing module (4), and the other end of the wireless transmission module (62) is used to communicate wirelessly with the external monitoring platform.

8. A multi-channel synchronous acquisition device for monitoring surge arresters according to claim 1, characterized in that, The output terminals of the power module (7) are electrically connected to the power input terminals of the signal conditioning module (1), the multi-channel acquisition module (2), the synchronization control module (3), the data processing module (4), the data storage module (5), and the data transmission module (6), respectively.

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