1. Application scope
The BFY-10A series negative sequence voltage relay (hereinafter referred to as the relay) is used in the relay protection lines of generators and transformers as a voltage blocking element to reflect the negative sequence component of the line voltage during asymmetric short circuits.
2. Main technical parameters
Rated voltage: AC 100V, 173V; 50Hz、60Hz； DC 220V, 110V, 48V.
Negative sequence action line voltage setting range: 6-12V, with a variation not exceeding 6%.
The allowable variation range of DC transformer: 220V and 110V are allowed to vary within the range of 80% -110%, and for 48V, it is allowed to vary within the range of 90% -110%. The relay should work normally.
Power consumption: AC 100V/≤ 5VA, 173V/≤ 8VA; DC 220V/≤6W，110V/≤4W,48V/≤2W。
Contact form: BFY-1lA type has one pair of dynamic contact points, BFY-12A type has one pair of dynamic contact points, and BFY-13A type has one pair of dynamic contact points and one pair of dynamic contact points.
BZY-1 positive sequence voltage relay

Internal wiring of BFY-10A series negative sequence voltage relay



4. Dimensions of BFY-10A series negative sequence voltage relay

BFY-10A series negative sequence voltage relay