Abstract:

The 2P DC 2 000 V frame disconnector is suitable for the new generation of new energy systems.For the design of the DC 2 000 V frame disconnector,in terms of the forced isolation of the main arc contact, the insulation parts are added to concentrate the arc on the arc contact, thereby improving the breaking capacity.In terms of reliable control of the contact timing,the appropriate timing difference is determined according to the relationship between the arc column voltage and the residual voltage under different currents,and the influence of contact wear is considered to ensure reliable arc extinction.Combined with high-voltage dynamic insulation simulation and DC arc voltage precise control calculation, the reliability of the product is accurately ensured.Through experimental verification,the new 2P DC 2 000 V frame disconnector meets the requirements of both new and old standards.

Key words: 2P, DC 2 000 V, main contact, arc contact, dynamic insulation, DC arc voltage