Table. 5.6.3 - 294. Settings for circuit breaker characteristics.
Name
Range
Step
Default
Description
Operations 1
0…200 000
1
50 000
The number of interrupting life operations at the nominal current (Close -
Open).
Operations 2
0…200 000
1
100
The number of interrupting life operations at the rated breaking current
(Open).
Current 1
(I
nom
)
0…100.00kA 0.01kA 1kA
The rated normal current (RMS).
Current 2
(I
max
)
0…100.00kA 0.01kA 20kA
The rated short-circuit breaking current (RMS).
Pick-up for alarming
For the alarm stages Alarm 1 and Alarm 2, the user can set the pick-up level for the number of
operations left. The pick-up setting is common for all phases and the alarm stage picks up if any of the
phases goes below this setting.
Table. 5.6.3 - 295. Pick-up settings.
Name Range Step Default
Description
Alarm
1
0:
Disabled
1:
Enabled
-
0:
Disabled Enable and disable the Alarm 1 stage.
Alarm
1 Set
0…200
000
1
1 000
Defines the pick-up threshold for remaining operations. When the number of remaining
operations is below this setting, the ALARM 1 signal is activated.
Alarm
2
0:
Disabled
1:
Enabled
-
0:
Disabled Enable and disable the Alarm 2 stage.
Alarm
2 Set
0…200
000
1
100
Defines the pick-up threshold for remaining operations. When the number of remaining
operations is below this setting, the ALARM 2 signal is activated.
Setting example
Let us examine the settings, using a low-duty vacuum circuit breaker as an example. The image below
presents the technical specifications provided by the manufacturer, with the data relevant to our
settings highlighted in red:
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
© Arcteq Relays Ltd
IM00021
383
Summary of Contents for AQ-M257
Page 1: ...AQ M257 Motor protection IED Instruction manual...
Page 2: ......
