Detail 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
8.1 MiCOM P125, P126 & P127
The MiCOM P125, P126 & P127 relays are based on the successful K, MODN and MX3
Each relay includes a large number of protection and control functions for most demanding
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 &
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
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