首页>
外国专利>
Differential protective relay for electrical buses with improved immunity to saturation of current transformers
Differential protective relay for electrical buses with improved immunity to saturation of current transformers
展开▼
机译:用于电气总线的差动保护继电器,具有更高的抗电流互感器饱和能力
展开▼
页面导航
摘要
著录项
相似文献
摘要
A differential protective relay and method for a microprocessor-based bus differential protective relay that ensures fast and sensitive operation under internal fault conditions and offers improved stability during external fault and other non-internal fault conditions. The method uses a two-slope differential characteristic to cope with small CT transformation errors without reducing relay sensitivity. The method can also use a saturation detector to switch dynamically between the 1-out-of-2 and 2-out-of-2 operating mode depending whether or not the CTs saturate. In a 2-out-of-2 operating mode, both the differential and directional elements must confirm a fault for the relay to trip. In a 1-out-of-2 mode, if saturation is not detected, the relay can trip without checking the fault direction.
展开▼