System for checking synchronization of AC voltage sources...

System for connecting either of two supply voltage type PCI card

System for detecting a breakage of a power cable for an elevator

System for detecting certain erroneous fault-indicating data in

System for detecting faulty SCR's

System for detection of ground faults in circuit breakers

System for detection of transients from a coupling capacitor vol

System for disconnecting an electrical power source from a load

System for eliminating arcing faults and power distribution...

System for foreseeing deterioration in interrupting performance

System for improving protective relay coordination with other pr

System for limiting short circuit current in 3-phase electric po

System for monitoring electrical circuit operation

System for monitoring the operating condition of a switch to pre

System for mounting and cooling power semiconductor devices

System for overvoltage protection

System for power transformer differential protection

System for predicting desynchronization of a synchronous machine

System for preventing sympathetic tripping in a power system

System for preventing undesired protective relay tripping action