It is assumed here that the transmission has multiple grounding points at wye connected transformer neutrals, located throughout the system. When this condition is satisfied, any arcing fault between a phase conductor and the ground will be supplied by zero-sequence currents originating in the neutral connection of the high-voltage transformer banks. We often refer to […]
UNIQUE CHARACTERISTICS OF GROUND FAULTS Read More »
An important aspect of transmission line protection is related to the fast detection and clearing of ground faults on transmission systems that have grounded neutrals. In the protection of transmission lines, ground faults are given special treatment. Ground faults are detected using different relays than those used for phase faults, although it is possible that
GROUND FAULT PROTECTION AND ITS IMPORTANCE Read More »
There are three basic types of relays that are used for ground relaying; overcurrent relays, distance relays, and pilot relays. Ground relays are almost always completely independent of phase relays, even though any fault current, including ground fault current, will flow through one or more of the phase relays. The ground relays, however, can be
TYPES OF GROUND RELAYS Read More »
There are several ways in which the system and the generator may interact with subsynchronous effects. A few of these interactions are basic in concept and have been given special names which are discussed here. •Induction generator effect • Torsional interaction • Transient torque 1) INDUCTION GENERATOR EFFECT: Induction generator effect (IGE) is caused by
TYPES OF SUBSYNCHRONOUS RESONANCE INTERACTIONS Read More »