Table. 5.6.1 - 285. Register content.
Date
and time
Event
Trigger currents
Time to
CTSact
Fault type
Used
SG
dd.mm.yyyy
hh:mm:ss.mss
Event
name
The phase currents (L1, L2 & L3), the residual
currents (I01 & I02), and the sequence currents
(I1 & I2) on trigger time.
Time remaining
before alarm
activation.
The status code
of the monitored
current.
Setting
group
1...8
active.
5.6.2 Voltage transformer supervision (60)
Voltage transformer supervision is used to detect errors in the secondary circuit of the voltage
transformer wiring and during fuse failure. This signal is mostly used as an alarming function or to
disable functions that require adequate voltage measurement.
The function uses a total of eight (8) separate setting groups which can be selected from one common
source. Also, the operating mode of the function can be changed via setting group selection.
The operational logic consists of the following:
• input magnitude processing
• threshold comparator
• block signal check
• time delay characteristics
• output processing.
The inputs of the function are the following:
• setting parameters
• measured and pre-processed voltage magnitudes.
The function's outputs are START, ALARM BUS, ALARM LINE and BLOCKED signals which can be
used for direct I/O controlling and user logic programming. The function generates general time-
stamped ON/OFF events to the common event buffer from each of the output signals. The time stamp
resolution is 1 ms. The function also provides a resettable cumulative counter for the START, ALARM
BUS, ALARM LINE and BLOCKED events.
Figure. 5.6.2 - 201. Secondary circuit fault in phase L1 wiring.
The following figure presents a simplified function block diagram of the voltage transformer
supervision function.
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
376
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
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