DC ice melting method for ordinary overhead ground wire and opgw of transmission line

Abstract

The invention discloses a DC (direct current) deicing method for overhead ground wires and OPGWs (optical fiber composite overhead ground wires) in electric transmission lines, and belongs to a line deicing method. The DC deicing method comprises the following steps: at first, the overhead ground wires and the OPGWs are all insulated, then, the lines are transformed according to different transmission grades, and flexible and effective line deicing is realized through segmentation and transposition connection of the lines and cooperation with a deicing power supply and a deicing switch. The method achieves the deicing operation of the overhead ground wires and the OPGWs of the electric transmission lines, saves resources and improves the deicing efficiency; the overhead ground wires and the OPGWs are in segmentation and transposition connection, induced high voltage on the lines is controlled within a reasonable range, the induced voltage on the lines is reduced, meanwhile, electric energy loss on the lines is reduced greatly, the energy saving effect is remarkable, and an arc quenching effect on the discharge gap is accelerated; and all insulation of the overhead ground wires and the OPGWs eliminates the power grid hidden danger, prevents electric power accidents due to old-fashioned ceramic insulator explosion, and improves the safety performance of an electric power circuit.

Description

technical field [0001] The invention belongs to a method for deicing ordinary overhead ground wires and OPGWs in overhead transmission lines. Background technique [0002] Overhead ground wires are mainly divided into ordinary overhead ground wires such as steel strands or good conductor ground wires and optical fiber composite overhead ground wires (OPGW for short). Ordinary overhead ground wires mainly adopt base-by-base grounding and segmented insulation single-point grounding. OPGW generally adopts base-by-base grounding because it has the dual functions of ground wire and communication optical cable. For the existing common overhead ground wires and OPGW, there are the following technical defects: 1) The common overhead ground wires of many towers are directly grounded, and some are grounded in sections, which will waste a lot of electric energy and cause huge power to the power system loss; 2) The existing common overhead ground wire and the old-fashioned ceramic grou...

AI Technical Summary

Problems solved by technology

For long-distance ultra-high voltage and ultra-high voltage transmission lines that have been in operation and have been installed with OPGW, they cannot be transposed, resulting in too high induction. This solution was developed to solve this problem that has affected energy saving and ice melting for many years.

Images