Contactor or Relay

IEEE Definition
Std 100-1992 "Standard Dictionary of Electrical and Electronic Terms" (Std 100-1992) has many definitions for 'Relay'! Conversely, the Standard's only 'Contactor' definition calls it a 'Load-Switch'! The point is that there is no simple definition.

contactor

relay

Distance Relay

Distance or distance relays are used as a safety relay main (main protection) in a transmission system, whether or SUTET SUTT, and as a backup or a backup for the front section. Distance relay works by measuring the amount of impedance (Z), and transmission is divided into several areas of security coverage of Zone-1, Zone-2, and Zone-3, and equipped also with teleproteksi (TP) in a bid for protection work is always fast and selective inside the security area. etc..

Working Principle Distance Relay Relay distance relays measure voltage and current at the point of visible disruption of the relay, by dividing the amount of voltage and current, the impedance to the point of interference can be determined. The calculation of the impedance can be calculated using the following formula: