Areva MiCom P120, Technical Manual, Page: 19 / 668

Introduction P12x/EN IT/A96
MiCOM P120/P121/P122/P123
Page 5/8
3. INTRODUCTION TO THE MiCOM P120, P121, P122 & P123 RELAYS
The range of MiCOM protection relays is built on the success of the MIDOS, K and MODN
ranges by incorporating the last changes in digital technology. Relays from the MiCOM P120
range are fully compatible and use the same modular box concept.
MiCOM P120, P121, P122 and P123 relays provide comprehensive overcurrent phase and
earth fault protection for utilities networks, industrial plants and networks as well as for other
applications where overcurrent protection is required. The earth fault protection is sensitive
enough to be applied in electrical networks where the earth fault current is low.
In addition to its protective functions, each relay offers control and recording features. They
can be fully integrated to a control system so protection, control, data acquisition and
recording of faults, events and disturbances can be made available.
The relays are equipped on the front panel with a liquid crystal display (LCD) with 2 x 16
back-lit alphanumerical characters, a tactile 7 button keypad (to access all settings, clear
alarms and read measurements) and 8 LEDs that indicate the status of
MiCOM P120, P121,
P122 and P123 relays.
In addition, the use of the RS485 communication port makes it possible to read, reinitialise
and change the settings of the relays, if required, from a local or remote PC computer loaded
with MiCOM S1 software.
Its flexibility of use, reduced maintenance requirements and ease of integration allow the
MiCOM P120 range to provide an adaptable solution for the problems of the protection of
electric networks.