Event log 

To collect sequence of events (SoE) information, the relays 

incorporate non-volatile memory with a storage capacity of 100 

events with associated time stamps and a resolution of 1 ms. 

The event log includes trip circuit monitoring status, protection 

operation status, binary I/O status and relay fault code. 

The event logs are stored sequentially, the most recent being first and so on. 

The non-volatile memory retains its data in the event of temporary auxiliary supply loss. 

The event log facilitates detailed post-fault analysis of feeder faults and disturbances. 

The SoE information can be accessed locally via the user interface on the relay front panel or remotely 

via the communication interface of the relay. 

​Recorded data

The relays store fault records of analog values for the last five trip events in non-volatile memory. 

The fault recording is triggered by the trip signal of a protection function. 

Each fault record includes the current values for three phases and ground current along with a time stamp. 

These records enable the user to analyze the five most recent power system events. 

The relays record the number of phase and ground fault trip events into dedicated trip counters. 

These trip counters cannot be reset by the user and are stored in non-volatile memory. 

The recorded information can be accessed locally via the user interface on the relay front

panel and can be uploaded for subsequent fault analysis.