AC Ice Melting Method for 35kv Distribution Network Lines

Abstract

The invention discloses an alternating-current ice-melting method of a 35kV power distribution network line. The alternating-current ice-melting method comprises the steps that a 35kV power distribution network circuit is transformed in a sectioned mode by adopting switches; line disconnecting links and switches at transformer substation outlets at two ends of the line are disconnected during ice melting; outage and sectioning are conducted on the line; the input end of an ice melting device is connected to a line which is coated with ice and is directly connected with a line disconnecting link at any transformer substation outlet, the output end is connected to the head end of the ice-coated sectioned line, and the tail end of the ice-coated sectioned line is in short-connected; the line disconnecting links at the transformer substation outlets are switched on, the ice melting device is electrified to melt ice on the ice-coated line; ice melting is completed, the line disconnecting links are disconnected, all connecting devices are dismounted, then all the disconnecting lines and the switches of the line are restored to normal working states of the power distribution network line, and ice melting is completed. The alternating-current ice-melting method adopts movable ice melting, the ice melting capacity is large and adjustable, an ice melting range is wide, the line is long, no harmonic wave is generated during ice melting, the influence on a system is small, and the ice melting reliability rate is high.

Description

technical field [0001] The invention specifically relates to an AC ice-melting method for a 35kV distribution network line. Background technique [0002] With the development of national economy and technology and the improvement of people's living standards, electric energy has become one of the indispensable secondary energy sources in people's production and life, bringing endless convenience to people's production and life. [0003] Since the transmission network is often exposed to the open air, the transmission network is often very vulnerable to natural disasters, which may cause transmission network accidents. In 2008, the large-scale rain, snow and freezing disasters in the south brought huge losses to the power grid. Due to the wide distribution of distribution network lines, most of them are located in micro-topographic and micro-meteorological areas, and accidents of tower collapse and disconnection occur frequently. The distribution network line is at the end o...

AI Technical Summary

Problems solved by technology

Some scientific research institutes have developed the method of melting ice by using the low-voltage power supply of the substation and the method of melting ice by the vehicle-mounted power supply, which have played a certain effect in the fight against ice and snow disasters in the distribution network. However, when the low-voltage power supply is used to melt ice, due to the fixed voltage, the ice-melting distance is limited Generally, only a small part of the lines in the substation can be melted; when the on-board power supply is thawed, due to the small capacity of the current on-board power supply, the length of the line that can be melted is relatively short. Heavy workload and low ice melting efficiency

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