Protective relay

Protective relay apparatus

Protective relay apparatus and methods for protecting electrical

Protective relay arrangements

Protective relay arrangements

Protective relay circuit providing a combined distance and overc

Protective relay circuits

Protective relay for an electric power system including decision

Protective relay for power systems having fault distance...

Protective relay for power systems having fault distance...

Protective relay having an improved characteristic angle adjustm

Protective relay having out-of-step logic capability

Protective relay system

Protective relay system

Protective relaying apparatus for electric power systems

Protective relaying apparatus for providing fault-resistance cor

Protective relaying system

Protective triggering of thyristors in a pulse generator

Pulse-width modulator for controlling a semiconductor...

Quasi-power measurement circuit