PROTECTION DEVICE FOR THREE PHASE POWER LINE SYSTEM

摘要

An apparatus for detecting currents in a three-phase power transmission system (10) includes a first detection circuit (22) electrically coupled to a first phase of the three-phase transmission system, a second detection circuit (24) electrically coupled to a second phase of the three-phase transmission system different than the first phase, and an event output switch (90) electrically coupled to the first detection circuit and the second detection circuit and configured to actuate when a subsynchronous current on at least one of the first phase and the second phase exceeds a pre-selected subsynchronous current setpoint.