What Is Directional Protection. AbstractPhase and ground directional elements are relied on for fast and secure protection throughout the power system. Generally earth faults are Single Line to Ground SLG and Line-Line to Ground LLG faults.
May 2015 Members Working Group D-3 Considerations in Choosing Directional Polarizing Methods for Ground Overcurrent Elements in Line Protection Applications. Directional Overcurrent Relays on GlobalSpec. Consider a generator is connected to a bus through CB.
The directional relay recognizes the direction in which fault occurs with respect to the location of relay.
Phase directional protection is installed to protect two connections operated in parallel a loop or a network component connected to two power sources. Directional really is connected towards load side of the line which will trip if overcurrent flows from load towards the source and non directional relay is connected at the source side which will trip if. Directional protection relay is often used in all network parts in which the direction of flow of power might change notably in the instance of a short circuit between phases or of an earthing fault single phase fault. In power systems relays are used to detect abnormal conditions.
