Power transmission line ice-coating monitoring system

Abstract

The invention provides a line ice-coating monitoring system. The system comprises a system monitoring switchboard, various levels of monitoring extensions, line pole monitoring terminals, expert software, communication modules and a power supply module, the line pole monitoring terminals comprise fiber Bragg grating sensors and fiber grating temperature sensors, the ice-coating thickness is accurately calculated by employing an ice-coating thickness calculating model of the expert software, the stress of a core rod of an insulator is monitored by employing the fiber Bragg grating, accurate parameters are provided, an installation structure of the fiber Bragg grating, arranged on the core rod, can effectively prevent brittle fracture of the core rod, the manufacturing process is simple, and the cost is low. According to the fiber grating sensor structures, thin metal sleeves are provided so that the influence of the metal sleeves on the temperature measurement of the grating is greatly reduced; besides, connecting rods are arranged around the metal sleeves so that the metal sleeves are prevented from being damaged by foreign matters, and the service lifetime of the fiber grating sensors is prolonged.

Description

technical field [0001] The invention relates to an icing monitoring system for transmission lines. Background technique [0002] On-line monitoring of power line icing is a very important part of power line status monitoring. In actual work, all-weather real-time monitoring of power line icing status parameters can make timely early warnings of potential faults in power lines. The control center The main engine can check the icing status of each line in real time, realize unified planning, unified dispatch and unified command under accident, so as to take measures in advance to avoid the occurrence of failure and improve the reliability and safety of power system operation. [0003] There are many monitoring methods in the current power line icing online monitoring system, and the common ones are direct measurement method, image method, weighing method and so on. The general structure of the system includes a monitoring switchboard, monitoring extensions of substations at a...

AI Technical Summary

Problems solved by technology

However, the process of setting a through hole in the center of the insulator mandrel to place the light grating is complex and costly. If a groove is opened on one side of the insulator mandrel to lay the grating light, and then fixed with glue, it is easy to seal the mandrel and the fitting. If it is not strict, it will cause problems such as brittle fracture of the mandrel

[0005] Moreover, in order to improve the calculation accuracy, some ice thickness calculation models use temperature parameters. However, the current temperature sensor is a non-optical sensor, and the calculation accuracy is not high due to the influence of electromagnetic interference.

Although some literatures have disclosed the structure of using fiber grating sensor to measure temperature, generally, glue is filled in the sleeve to fix it. This kind of structure has a thicker sleeve, which has a great influence on the temperature measurement of fiber grating, so that the temperature measurement of fiber grating has the advantages of Hysteresis, unable to reflect temperature conditions in real time

Moreover, the filling glue will also affect the pretension of the fiber grating

The Chinese invention patent with the authorized notification number CN102213625 B discloses a fiber grating temperature sensor, which uses an optical fiber fixing sheet to solve the problem of filling glue and fixing it. However, a groove for fixing the optical fiber fixing sheet is arranged in the packaging tube, and the packaging tube Both ends need to be provided with threads that match the optical cable connectors. These two methods must make the packaging tube thicker, which will inevitably affect the real-time measurement of temperature.

Moreover, in bad weather, the surface of the packaging tube is prone to ice, which affects the temperature measurement accuracy of the internal fiber grating temperature sensor

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