electrical degree การใช้

• The 365-foot emergency antenna is 145.5 electrical degrees with an efficiency of about 343 mV / m / kW at 1 km.
• There are some customers in downtown areas who get 120 / 208 volt service, since they actually are provided with 2 phases 120 electrical degrees apart.
• Typical parameters determining synchronization are : voltage difference less than 5 %, frequency difference less than 0.2 Hz, and maximum phase angle between the sources of 5 electrical degrees.
• Instead larger universal motors often have " compensation windings " in series with the motor, or sometimes inductively coupled, and placed at ninety electrical degrees to the main field axis.
• A split-phase motor has a secondary startup winding that is 90 electrical degrees to the main winding, always centered directly between the poles of the main winding, and connected to the main winding by a set of electrical contacts.
• Sometimes as a precaution against out-of-step connection of a machine to a system, a " synchro check " relay is installed that prevents closing the generator circuit breaker unless the machine is within a few electrical degrees of being in-phase with the system.
• A simple anti-fading antenna is a vertical radiator whose height is between 1 / 2 wavelength ( 180 electrical degrees ) and 5 / 9 wavelength ( 200 degrees ), 195 degrees being considered ideal . 200 degree and taller simple radiators have largely fallen into disuse, although these can be useful on medium power stations, in which case radiators as tall as 5 / 8 wavelength ( 225 degrees ) are somewhat common.