Page 18 MiCOM P120/P121/P122/P123 HOW TO USE THIS MANUAL This manual provides a description of MiCOM P120, P121, P122 and P123 functions and settings. The goal of this manual is to allow the user to become familiar with the application, installation, setting and commissioning of these relays.
Technical guide for MiCOM P120/P121/P122/P123 overcurrent relays: safety, installation, application, and commissioning.
Technical guide for Schneider Electric's MiCOM P120, P121, P122, and P123 series overcurrent relays, detailing installation, commissioning, operation, and safety aspects.
MiCOM P120, P121, P122 and P123 relays have been designed to control, protect and monitor industrial installations, public distribution networks and substations, and to be used as back-up protection for EHV and HV transmission networks.
Schneider Micom P122 relay is a part of MiCOM P12x range of directional and non-directional overcurrent relays from single phase or earth fault up to the multifunctional three-phase P127 device with voltage protection functions.
The MiCOM P122 & P123 relays include a programmable function specially designed to detect unbalanced fault conditions when earth fault elements are not operated or not sufficiently sensitive.
MiCOM P122, P123 and P127 relays are able to measure the ratio of negative to positive sequence current (I2/I1). This fully programmable function allows more sensitivity and stability than pure negative sequence measurement.
The MiCOM P122 is an overcurrent and earth fault protection relay for feeders. It provides overcurrent, earth fault, lockout, thermal overload, undercurrent, breaker failure, negative sequence, and restricted earth fault protection.
MiCOM P122 Relay Data Sheet | PDF | Power Supply - Scribd