Abstract: The ice melting disconnector of 550 kV line is installed outdoors. When the high-voltage transmission line needs ice melting treatment, the ice melting disconnector is also likely to be in icing state. Therefore, it is particularly important to meet the balance performance design under different working conditions. According to the requirements of product technical parameters, the structure of 550 kV high-capacity ice melting disconnector is designed. On this basis, the balance performance of ice melting disconnector under different working conditions is designed and checked. The results show that the balance performance of the 550 kV high-capacity ice melting disconnector meets the operation requirements under normal operation and 20mm icing conditions, and the balance performance design method adopted is generally applicable.

Key words: ice-melting disconnector, high capacity, balance performance