MICOM P127

GENERAL ON MiCOM P125, P126 & P127 The MiCOM P125, P126 & P127 relays have been designed for controlling, protecting and monitoring industrial installations, public distribution networks and substations. They can also be used as part of a protection scheme for transformers and generator transformers. The P125, P126 & P127 relays can also provide back-up protection for HV and EHV transmission systems. 8.1 MiCOM P125, P126 & P127 The MiCOM P125, P126 & P127 relays are based on the successful K, MODN and MX3 range. Each relay includes a large number of protection and control functions for most demanding applications. On the front panel the relays are equipped with a liquid crystal display ( LCD) with 2 x 16 backlit alphanumeric characters, a tactile 7-button keypad ( to gain access to all parameters, alarms and measurements) and 8 LEDs to display the status of the MiCOM P125, P126 & P127. A dedicated AREVA setting software package is available that allows the user to read, initialise and change the relay parameter settings via the RS485 rear communications port and/ or the RS232 front port. The MiCOM P125, P126 & P127 relays provide comprehensive directional overcurrent protection for utilities networks, industrial plants and networks in addition to other applications where directional or non-directional overcurrent protection is required. The directional earth fault element is sensitive enough to be used in impedance-earthed systems ( such as resistance or Peterson Coil) or insulated systems. The models available are: MiCOM P125: Directional earth fault relay with earth fault wattmetric element. MiCOM P126: Three phase overcurrent and directional earth fault relay with earth fault wattmetric element and autoreclose function. MiCOM P127: Directional overcurrent and directional earth fault relay with earth fault wattmetric element, overvoltage/ undervoltage protection and autoreclose function