216730 ⎘
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 corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system involving comparison of phase voltages
Method for identifying element failure in capacitor banks
#2Power conversion apparatus that judges system power failure based on system frequency and voltage
#3Location of a ground fault in an IT network
#4Method for controlling a leakage current protection device in a photovoltaic apparatus
#5METHOD AND DEVICE FOR CONTROLLING OPENING/CLOSING OF CIRCUIT BREAKER
#6Ground fault overvoltage relay device
#7Safety tripping device for a frame-type ACB drawer seat
#8Safety detection device and method of grid-connected inverter
#9Method and apparatus for detecting vector shift
#10System for detecting a falling electric power conductor and related methods
#11IMBALANCE DETERMINING METHOD, IMBALANCE DETERMINING APPARATUS, AND RECORDING MEDIUM
#12System for detecting a falling electric power conductor and related methods
#13Supply voltage auto-sensing
#14Motor drive ground fault detection
#15System and method for polyphase ground-fault circuit-interrupters
#16MOTOR DRIVE GROUND FAULT DETECTION