216713 ⎘
Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus involving comparison of similar homopolar quantities
Boundary separation scheme for faults in power systems
#2Method and device for protecting an autotransformer for an aircraft
#3Method and apparatus for differential protection of an electric connection
#4Negative sequence differential element
#5Method and device for fault detection in an N-winding three-phase power transformer
#6Current differential protection relays
#7Method and device for fault detection in transformers or power lines
#8Apparatus and method for providing differential protection for a phase angle regulating transformer in a power system
#9Protective relay capable of protection applications without protection settings
#10Method and an apparatus for supervising the operation of current transformers