NB-IOT (Narrow Band Internet of Things)-based high-voltage cable low-power-consumption online monitoring equipment

Abstract

The invention discloses NB-IOT-based high-voltage cable low-power-consumption online monitoring equipment. The NB-IOT-based low-power-consumption online monitoring equipment comprises 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 a power management module. According to the invention, the main control chip carries out priority classification on various required data through equipment working modes, sheath current data and fault recording data are set as a first priority, and the data of the level need to be transmitted in all working modes. Data such as temperature, vibration and equipment information are set as a second priority, and the data of the level can be transmitted only in a normal working mode. In the data transmission process, through the limitation of the sizes of the data packets, the data packets with the too large data size are removed, uploading of invalid data is reduced, in different working modes, the frequency of data communication and the transmission amount of data communication can also be correspondingly changed, communication power consumption is reduced, and normal operation of equipment 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 on-line 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 ages, it will destroy the grounding method of the metal sheath. , resulting in a rapid increase in the ground current, resulting in hidden dangers of cable failure. The monitoring of the ground current is a popular online monitoring method nowadays, but most of the high-voltage cable online monitoring equipment on the market is devoted to how to efficiently detect cable faults, but seldom checks the operation stability and power consumption of the monitoring equipment itself. Researc...

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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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