Ultra-high voltage transmission lines are a wire erection method used to suppress corona discharge and reduce line reactance. Our country started developing it in the early 1990s, and successfully developed it in 1992. It obtained a national patent and is now in mass production and used in some areas.
Concept editor
Split wire
Ultra-high voltage transmission lines are a wire erection method used to suppress corona discharge and reduce line reactance. That is, each phase conductor is composed of several sub-conductors with smaller diameters. Each sub-conductor is spaced at a certain distance and arranged in a symmetrical polygon, and is arranged at the vertices of the regular polygon. The number of split wires for ordinary split wires generally does not exceed 4, and the number of split wires for ultra-high voltage transmission lines is generally 3 to 4.
Split conductors are generally composed of 2-4 conductors with smaller cross-sections for each phase conductor. The distance between the separate conductors is 0.2-0.5 meters, which can play the role of increasing the diameter of the conductor and is smaller than the total conductor. Large wires with the same cross-section are less likely to produce corona and have higher power transmission capabilities. Split conductors are mainly used on lines with voltages of 220 kV and above. Generally, 220kV has 2 splits, 500kV has 4 splits, Northwest Power Grid has 750kV with 6 splits, and 1000kV has 8 splits.
2 Development History Editor
Our country began to develop it in the early 1990s and successfully developed it in 1992.
It has obtained a national patent and is now in mass production. , and applied in some areas.
3 Advantages Editor
Low-voltage insulated split wire (hereinafter referred to as split wire) is different from conventional wires.
It is composed of three or four single-core wires A split wire, or wire bundle, that is manufactured together through a certain process.
This split wire is not only different from conventional wires in form, because the split wire can cause the magnetic field around the wire to be distributed Change, thereby equivalently increasing the radius of the wire and reducing the reactance of the wire; at the same time, it also changes the electric field distribution around the wire, so that the susceptance of the wire also increases accordingly. Split conductors have obvious advantages over conventional conductors. Applying split conductors to low-voltage distribution networks can reduce voltage drops and effectively improve the natural power factor of the lines, thus improving the power of medium and low-voltage power grids. quality.
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