Areva MiCom P120, Technical Manual, Page: 297 / 668

Application Guide P12x/EN AP/A96
MiCOM P120/P121/P122/P123
Page 75/80
32. DISTURBANCE RECORDER
The integral disturbance recorder has a memory space specifically dedicated for storage of
disturbance records. Up to 5 disturbance records of 3 seconds duration each can be stored.
When the available memory space is exhausted, the new record automatically overwrites the
oldest record.
The recorder stores actual samples that are taken at a rate of 32 samples per cycle.
Each disturbance record consists of analogue and digital channels. (Note that the relevant
CT ratios for the analogue channels are also extracted to enable scaling to primary
quantities). The
RECORD/DISTURB RECORD menu is shown below:
SETTING RANGE
MENU TEXT
MIN MAX
STEP SIZE
Disturb Record
Pre-Time 100 ms 3000 ms 100 ms
Post-Time 100 ms 3000 ms 100 ms
Disturb Rec Trig On Instantaneous On Trip
The total disturbance recording time is 3.0 s (pre-trigger plus post-trigger). For example,
default settings show that if the pre-time time is set to 100 ms and the post -time to 2.5 s,
than the total disturbance recording time will be 2.6 s.