Universal Overcurrent Relays Block P121

The MiCOM P12x series are the universal over urrent relay range for ALSTOM. Starting with the single phase P120 up to the multifunction three phases and earth P123, MiCOM relays are fully designed to protect and control industrial plants, utilities substations and networks at any voltage level. Protection features of the MiCOM P12x range include 3
independent phase overcurrent stages, 3 independent earth overcurrent stages, 12 selectable curve characteristics, thermal overload protection, undercurrent and negative-sequence overcurrent protection. Flexible automation functions
enable accurate co-ordination with other devices. Circuit-breaker monitoring is performed through closing and opening time measurements, breaker failure protection and trip circuit supervision.Two setting groups accomodate complex protection and control schemes. Setting commutation is available locally or remotely. All the information in memory such as settings, measurements, events, fault or disturbance records are easily transmitted for better network
management. Remote system requests are immediately executed and transmitted to the adjacent switchgear. MiCOM P12x relays provide simple and powerful operator interface. The LEDs and LCD display on the front panel are fully
programmable to user requirements. True RMS current and frequency values are measured by all the MiCOM P12x relays.
Measurements are displayed on the front panel and are available for local viewing and remote transmission. For each MiCOM P12x relay, inputs and outputs are freely assignable and combinations of any thresholds are independently programmable for each output. Setting software MiCOM S1 combined with the front and rear communication ports allow the user easy access to all stored information and ouput of operating curves or parameter trends. The MiCOM P121 relays are housed in the same drawout 4U metal case for panel or rack mounting. The use of MIDOS connectors allows full compatibility with existing ALSTOM devices. CT inputs of any relay of the MiCOM P12x series are 1 and 5 Amp dual rated.