The principle of circuit blank mainly involves insulation distance and safety requirements in power line design. In high-voltage transmission lines, bare wires are usually used instead of insulated wires because the voltage level of high-voltage transmission lines is higher, and the use of insulated wires will increase the weight of the wires, thereby increasing costs. Adequate air insulation distance needs to be ensured between bare wires and grounding bodies to prevent short circuits caused by external forces such as wind deviation and icing.
Specifically, sufficient air insulation distance must be ensured between bare wires and grounding bodies, as well as between bare wires. Wind deviation and icing are common external influences, which can cause the wire to shift to one side and shorten the distance from the tower; Ice cover will increase the weight of the wire, resulting in a shorter distance between wires and tower distances, which may cause grounding short circuits.
Therefore, when designing high-voltage transmission towers, it is necessary to perform insulation distance verification (gap circle verification) based on the line voltage level, wire cross-section, number of split lines, wind deviation, and icing conditions.