On-line monitoring system and monitoring method for distributed cable terminals

Abstract

The invention relates to an on-line monitoring system and a monitoring method for distributed cable terminals, and belongs to the measurement field. The whole system is divided into three layers from top to bottom. The bottom layer is a target layer comprising wireless temperature sensors mounted on temperature measuring points, each sensor monitors the temperature of one monitored target and transmits data to the outside through wireless methods; the middle layer is a partition layer comprising a wireless communication gateway, switch cabinet or voltage intervals can be taken as targets by the wireless communication gateway to perform configuration as required on site; the collected measuring results can be transmitted by the wireless communication gateway through various channel methods ready on site; the top layer is a station layer comprising a central server for gathering monitoring centers; and data transmitted by the wireless communication gateways can be received by the central server through various channel methods ready on site, and are displayed, stored and analyzed by the central server, so that out-of-limit warning or accident pre-warning functions can be realized. The on-line monitoring system and the monitoring method for the distributed cable terminals can be widely applied to the equipment condition monitoring field of power systems.

Description

technical field [0001] The invention belongs to the field of measurement, in particular to an online state monitoring for electric equipment. Background technique [0002] The safe operation of power transmission and transformation equipment in the power system is very important. According to relevant statistics, more than 200,000 motors are burned every year in my country, and the accident rate of transformers in the country is 13%. According to the statistics of the number of accidents classified by technology, overheating accidents accounted for 25.4%, and insulation accidents accounted for 48.1%. Bus contact accounts for 10% of the accident rate. Accidents are mainly manifested as voltage breakdown and thermal burnout or thermal breakdown, and the deterioration process of insulation aging caused by overheating and voltage breakdown is the main reason. [0003] In order to ensure the proper service life of electrical equipment and reduce the occurrence of accidents, in...

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Problems solved by technology

[0008] Insufficiency of existing contact temperature measurement schemes: contact temperature measurement schemes usually use thermocouples, optical fiber sensors, and resistive sensors as temperature measurement sensors. The measurement at room temperature requires cold end compensation. In actual measurement, when the distance between the hot end and the cold end is far away, a compensation wire is also required; How to install and route the fiber optic sensor is very problematic. The optical fiber transmission signal scheme is not easy to achieve complete isolation of high and low potentials. When the transmitting end is installed with a high voltage end, the problem of ground insulation cannot be solved; using a resistive sensor for direct contact measurement, It is a good way to transmit signals with wires at high potentials, simply use air gaps to isolate high and low potentials, and transmit temperature signals through infrared photoelectric conversion. However, the infrared emitting and receiving tubes are exposed, and long-term use will cause dust and pollution, making signal transmission reliable. It is also a difficult problem to solve the problem that the gradual deterioration of the performance affects the measured value. In addition, it must be professionally installed and debugged on site. The convenience of use is not ideal.

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