Transmission line equivalent icing thickness monitoring system and method

Abstract

The invention provides a transmission line equivalent icing thickness monitoring system and method. The system comprises a conductor inclination angle sensor and / or an insulator string inclination angle sensor and a main controller, wherein the conductor inclination angle sensor is arranged at a conductor hanging point; the insulator string inclination angle sensor is arranged on a suspension insulator string; the main controller is arranged on a tower cross arm; and the conductor inclination angle sensor and / or the insulator string inclination angle sensor are / is in communication connection with the main controller. The system conveniently and accurately realizes monitoring on the transmission line conductor icing, and the requirements of early warning and monitoring in a power sector canbe met.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of power transmission lines, in particular to a system and method for monitoring the equivalent ice thickness of power transmission lines. Background technique [0002] Anti-icing and anti-icing have been the top priority of transmission line work over the years. At present, there are various monitoring methods for equivalent ice thickness at home and abroad, including dip angle method, weighing method, image equivalent discrimination method, meteorological method, etc. The most widely used are the weighing method and the inclination method. However, the equivalent ice thickness technology based on these two methods still has certain defects and deficiencies, which are mainly reflected in the following aspects: [0003] The shortcomings of the equivalent ice thickness monitoring technology of the weighing method are as follows: 1. It is more suitable for straight towers, but not suitable for ten...

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Problems solved by technology

[0003] The shortcomings of the equivalent ice thickness monitoring technology of the weighing method are as follows: 1. It is more suitable for straight towers, but not suitable for tension towers: based on the weighing method, it monitors the vertical load changes within the vertical span to indirectly The basic principle of monitoring the equivalent ice thickness is not suitable for monitoring the ice thickness by weighing method in tension-resistant occasions, which greatly affects the selectivity of the location of the ice monitoring device; 2. The current The insulator string tension sensor adopts the installation method of replacing the ball head hanging ring. The operation process is complicated and cumbersome, which is not conducive to on-site installation and operation and maintenance. There are many types of sensors, and they cannot be interchanged with each other; Fourth, the replacement of line fittings has added hidden dangers to the safe operation of the line

[0004] The deficiencies of the inclination method equivalent ice thickness monitoring technology are as follows: 1. There are defects in the design of the power supply system: the previous wire inclination and temperature sensors have defects in the energy harvesting method. The normal operation of the lower sensor greatly depends on the stability of the wire current (the scope of application is small), so the operation of the power system has been unstable, and the failure rate of the sensor has been high

2. The accuracy of monitoring data is poor: Research shows that there are three main reasons for the poor monitoring accuracy: 1) The wire inclination method needs to be supported by a high-precision wire inclination monitoring sensor, and its accuracy level needs to be 0.1° 2) Under the condition of strong wind, the conductor is in a state of motion. If we simply sample the inclination data of the conductor at this time and do not take filtering measures for the noise caused by the wind load, the accuracy of the inclination monitoring of the conductor will be greatly affected. Finally, 3) The influence of the inclination angle of the insulator string on the icing monitoring is not fully considered. Under the icing condition, there are often different degrees of unbalanced tension on both sides of the hanging insulator string, and The more serious the icing, the more significant the unbalanced tension difference. Numerical simulation results show that if the slight change of the wire span caused by the unbalanced tension is ignored, the final calculated wire stress and equivalent icing thickness will appear relatively large. big error

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