A low-power on-line monitoring device for high-voltage cables based on nb-iot

Abstract

The invention discloses an NB-IOT-based high-voltage cable low-power online monitoring device, including a current sensor, an AD conversion module, a main control chip, a PC terminal, an upper computer, an NB-IOT wireless communication module, a sensor group and power management module. The present invention uses the main control chip to classify the various required data according to the priority of the equipment working mode. The sheath current data and the fault recording data are set as the first priority. In all working modes, this level of data needs to be transmission. Data such as temperature, vibration, and device information are set as the second priority, and data at this level will only be transmitted in normal working mode. During data transmission, the size of the data packet is limited, and the data packet with too large amount of data is eliminated to reduce the upload of invalid data. Under different working modes, the frequency of data communication and the transmission volume of data communication will also be changed accordingly. The communication power consumption is reduced, and the normal operation of the device is also guaranteed.

Description

technical field [0001] The invention relates to the field of electric power engineering, in particular to an NB-IOT-based low-power consumption online monitoring device for high-voltage cables. Background technique [0002] There is a changing electric field around the alternating current transmitted by the high-voltage cable, which will cause a corresponding induced current on the metal sheath of the cable. The cable is grounded by cross-connection to reduce the induced current. When the cable insulation is aging, it will destroy the metal sheath. Grounding method , resulting in a rapid increase in ground current, resulting in potential cable faults. The monitoring of grounding current is a popular online monitoring method, but the current high-voltage cable online monitoring equipment on the market is mostly dedicated to how to efficiently detect cable faults, but rarely does the operation stability and power consumption of the monitoring equipment itself. Research and de...

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Problems solved by technology

[0002] There is a changing electric field around the alternating current transmitted by the high-voltage cable, which will cause a corresponding induced current on the metal sheath of the cable. The cable is grounded by cross-connection to reduce the induced current, and when the cable insulation ages, it will destroy the grounding method of the metal sheath. , causing the ground current to increase rapidly, resulting in hidden dangers of cable faults

The monitoring of ground current is a popular online monitoring method nowadays, but most of the online monitoring equipment for high-voltage cables on the market is devoted to how to detect cable faults efficiently, but seldom checks the operation stability and power consumption of the monitoring equipment itself. Research and design lead to a high failure rate of monitoring equipment, which cannot run stably for a long time, resulting in an increase in the chance of monitoring results

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