Alternating-current deicing device for distribution line

Abstract

The invention belongs to the field of the deicing for a distribution line and particularly relates to an alternating-current deicing device for the distribution line. The deicing device consists of a group of single-phase silicon-controlled valves, an alternating-current reactor, a bypass-used single-phase isolating switch and three single-phase isolating switches, wherein an input end of a circuit breaker is connected with a deicing power supply, an output end of the circuit breaker is connected with input ends of the single-phase isolating switches on a three-phase line respectively, and output ends of the single-phase isolating switches are connected with a deiced line; and the single-phase silicon-controlled valves and the alternating-current reactor are connected between the output end of the circuit breaker in any phase and the input ends of the single-phase isolating switches in series, and the two ends of the alternating-current reactor are connected with the bypass-used single-phase isolating switch in parallel. According to the deicing device, with the utilization of the feature of blocking alternating current and allowing direct current of a distribution transformer, the distribution transformer does not need to be dismantled in the alternating-current deicing for the distribution line, thereby reducing a large amount of work for dismantling the distribution transformer in the direct-current deicing; and the deicing current is continuously regulated through regulating the firing angles of the single-phase silicon-controlled valves.

Description

technical field [0001] The invention belongs to the field of ice melting for power distribution lines, in particular to an AC ice melting device for power distribution lines. Background technique [0002] In recent years, the weather has changed a lot, and extreme weather occurs frequently. Freezing rain and ice and snow disasters will cause a sharp drop in the mechanical and electrical performance of the power grid, resulting in icing of the power grid. In the past 30 years, the frequency of large-scale ice and snow disasters in our country, especially in the south, has continued to increase. Ice and snow on power lines will cause tripping, disconnection, pole down, wire dancing, insulators, etc. Flashover, communication interruption and other accidents. According to incomplete statistics, from 1954 to 2008, there were more than 1,000 various icing disasters in power grids with a voltage level of 6kV and above, including power lines, substations, and railway power systems,...

AI Technical Summary

Problems solved by technology

However, for the 10kV distribution network to melt ice, since there are many distribution transformers distributed in the entire distribution line, if a DC ice melting device is used to melt ice, then all distribution transformers must be disconnected from the line, which will cause If the distribution transformer is not disconnected to melt the ice directly, the distribution transformer will shunt the DC current, so that the current of the ice-melting line will decrease, and the effect of melting ice will not be achieved, and because the DC current passes through the distribution transformer The reason for this will inevitably cause damage to the distribution transformer, so the method of melting ice for the 10kV distribution network DC large current is obviously not applicable

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