As a new type of diversion product on the low-voltage side of the main transformer of a substation

the fully-insulated tubular bus-bar has the characteristics of large current carrying capacity and small skin effect

and has been widely used in substations in recent years. But the fully-insulated tubular bus-bar has frequent defects during operation

and often burns and discharges. Based on the burn-in failure of the fully-insulated tubular bus-bar in a power supply company

this paper analyzes the design defects of the fully-insulated tubular bus-bar

and proposes a new transformation method. Finally

it was successfully applied in a 220 kV substation and achieved good operating results.