Primary Protection: It is the first protection line that detects the fault and quickly disables it. The secondary protection system provides a backup to the primary. ABB's Relion family of protection and control relays for secondary distribution offers a wide range of products for protection, control, measurement and supervision of power distribution systems for IEC and ANSI applications – from generation and interconnected grids in secondary distribution. All. Protection in electrical energy systems is preferred with the aim of stopping the energy flow safely and preventing damage to the system in the event of any fault or system malfunction. Protection mechanisms in electrical systems are generally divided into two main categories: Primary Protection:. Protective Relays - Technical Seminar Nov 2016 - Copyright: IEEE 2 Abstract: Protective relays and devices have been developed over 100 years ago to provide “lastline”of defense for the electrical systems. : 4 The first protective relays were electromagnetic devices, relying on coils operating on moving parts to provide detection of abnormal operating conditions such as. Backup protection is a secondary layer of protection that provides additional protection in case the primary protection fails to detect and isolate the fault.
