BEEME 2 Comparisons

UNIT – 3

Utilization of Electrical Power

Compare fuse and circuit breaker

Fuse	Circuit breaker
Detects and interrupts the fault current	Only interrupts the fault current. Detection is done by relay system
Automatic operation	Not automatic. Relay system is required to operate it
Breaking capacity is less	Has large breaking capacity
Arc interruption is simple	Arc interruption is complicated
Operating time is small. Operating speed is high	Operating time is large. Operating speed is comparatively less
Replacement / rewiring required after each operation	No replacement needed. Easy to reset
Simple design. Cheap	Complicated design. expensive

Comparing Horizontal and vertical axis wind turbines

	Horizontal axis wind turbines	Vertical axis wind turbines
Axis of rotation	Axis of rotation is parallel to ground and wind steam	Axis of rotation is perpendicular to ground and wind stream
Mount point	Gearbox and generator are mounted above the ground with a tower to support them	Gearbox and generator are mounted at ground level. Hence does not require any support tower.
Output energy	Overall energy output is more	Overall energy output is less
Efficiency	Overall efficiency is more	Overall efficiency is less
Stress	Higher stress is put at the base of the blade by the wind	Higher stress is put at the center of the blade by the wind
Structural support	Requires more structural support	Requires less structural support
Installation and maintenance	Installation and maintenance is hard	Installation and maintenance is easy
Yaw control	Yaw control is necessary to turn rotor so that the blades face the wind	Yaw control not needed  as rotor reacts to wind from any direction