216715 ⎘
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 using pilot wires or other signalling channel involving phase comparison
Ground fault overvoltage relay device
#2Network protector control for spot network fed from feeder sources having voltage differences
#3RF phase offset detection circuit
#4Protective relaying device
#5Method and apparatus for providing differential protection for an electrical link in a medium, high, or very high voltage network
#6Voltage protection arrangement for an electronic device
#7Synchrophasor measuring device and inter-bus-line phase angle difference measurement unit using the same
#8Method and system for communications channel delay asymmetry compensation using global positioning systems