Areva MiCOM P225, Техническое руководство

Страница: 105 / 288

User Guide P225/EN FT/B11
MiCOM P225 Page 49/52
N.B.: – If the configuration of the pre-time and post-time corresponds to
total recording duration of more than 2.5 seconds then the post-
time duration is automatically reduced so that the total recording
duration is 2.5 seconds.
– Disturbance recordings are not erasable. They are managed in a
circular list: when this is full, the oldest recording is erased.
– The data registered in non volatile memory are available for 1 year
without auxiliary power, thanks to a back-up battery housed in the
front face.
– When the disturbance recordings are extracted from relay P225
using the MiCOM S1 support software, they are stored in the
COMTRADE
format.
4.12.3 The CB MONITORING submenu display of the values related to the cut-off device
In this menu the operator with access to data relating to the cut-off device:
−
Summation of the amps exponent “ n ” switched by the cut-off device for each phase.
−
Total number of operations of relay RL1
−
Opening time of the cut-off device.
N.B.: – These data are those calculated by the relay P225 whilst in the CB
SUPERVISION menu the operator with access to the adjustment
of the parameters to generate alarm data when a threshold is
exceeded.
– The way in which relay P225 calculates its data is explained in the
section CB SUPERVISION .
4.13 ALARM messages
The management of the alarms is carried out directly on the front face screen. The display of
alarm messages takes priority over that of the value by default (selected in CONFIG.
SELECT submenu), so that as soon as an alarm is detected by the, the message is
displayed on the MiCOM P225 relay screen.
The alarm messages are classified into 2 categories:
•
Motor alarm message
•
Relay hardware or software fault, or RTD/thermistor failure message.
The display of a HARDWARE ALARM message takes priority over the display of a MOTOR
ALARM message.
N.B.: Upon loss of auxiliary power supply, the alarm messages disappear.
They are restored upon return of the power supply. The MOTOR
ALARM messages
4.13.1 The ALARM menu
Data considered as motor alarm are displayed in the MOTOR ALARMS menu.
If several alarms appear, they are written to memory in the order of their detection. They are
displayed in reverse chronological order (the most recent alarm first, the oldest last). Each
message is numbered and the total number of messages is indicated.
Example
This message indicates an earth fault (time delayed threshold t
I
o>>). This alarm is the 2nd
out of total of 7.
t I0>> 2/7
The operator can read all of the alarm messages using the ! key, without any necessity to
key in the pass word.