FIELD: electricity.
SUBSTANCE: high-voltage circuit breaker with live case comprises base insulator (20), at least one elongated current interrupter (10) placed at base insulator (20); current terminals (30) connected to ends of the current interrupter and at least one corona ring (40) placed at least partially around one of the current terminals, at that corona ring (40) is equipped with hydrophobic surface layer (42) that covers in essence the whole surface of the corona ring or only its bottom areas.
EFFECT: improved dielectric strength due to more even distribution of electric field around corona rings in high humidity conditions.
12 cl, 2 dwg
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