Areva MiCOM P225, Technical Manual

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P225/EN FT/B11 User Guide
Page 48/52 MiCOM P225
4.12.2 The DISTURBANCE RECORD submenu
The MiCOM P225 relay offers the possibility of saving 5 disturbance records. The data are
acquired at a frequency of 32 samples per electrical cycle, ie. 1600Hz in a 50Hz system or
1920 Hz in 60Hz system, and allows for a very faithful reconstruction of the analogue
signals.
For each recording, the relays memorises
−
the 3 phase currents
−
the earth current
−
the phase-phase voltage VAC
−
the frequency
−
the state of the 6 logic inputs
−
the state of all the output relays (including the watchdog relay)
−
the date and the time
The total duration of a recording is defined by the configuration of the pre-time and post-time.
The pre-time defines the duration of the recording before the disturbance recording triggering
order, the post time defines the duration of the recording after the disturbance recording
triggering order. In all cases, the total duration of a recording cannot exceed 2.5 seconds.
P0244ENa
Duration of recording :
2,5
seconds maximum
Pre-time Post-time
Triggering order
The triggering of a disturbance recording can be generated:
•
when a logic entry programmed on “ DIST TRIG ” is excited (see section 4.11.4.2.4
Trigging of the disturbance recording)
•
on receipt of a remote control from a supervisor on the communications network
(RS485 rear port)
•
on receipt of a remote control from MiCOM S1 support software (RS232 front port)
•
when one of the following occurs (exclusive choice):
−
instantaneous over-stepping of one of the following current thresholds:
I
>>,
I
o>,
I
o>>, V< or V> (instantaneous short-circuit, instantaneous earth fault 1st and 2nd
stages, instantaneous under- and overvoltage data respectively)
−
or when output relay RL1 is excited (relay dedicated to the tripping of the cut-off
device). The excitement of this relay can be due to the detection of an electrical
fault or to a voluntary opening order (opening remote control on the
communication network, external order relayed by one of the logic inputs).
The disturbance recordings can be retrieved:
•
either using the remote communication network (RS485 rear port)
•
or using the MiCOM S1 support software (RS232 front port)