The blocking signal can also be tested in the commissioning phase by a software switch signal when
the relay's testing mode "Enable stage forcing" is activated (
General
→
Device).
The variables the user can set are binary signals from the system. The blocking signal needs to reach
the device minimum of 5 ms before the set operating delay has passed in order for the blocking to
activate in time.
Operating time characteristics for activation
This function supports definite time delay (DT). For detailed information on this delay type please refer
to the chapter "General properties of a protection function" and its section "Operating time
characteristics for trip and reset".
Events and registers
The voltage transformer supervision function (abbreviated "VTS" in event block names) generates
events and registers from the status changes in ALARM ACTIVATED and BLOCKED signals. The user
can select which event messages are stored in the main event buffer: ON, OFF, or both.
The events triggered by the function are recorded with a time stamp and with process data values.
Table. 5.6.2 - 290. Event messages.
Event block name
Event names
VTS1
Bus VT fail Start ON
VTS1
Bus VT fail Start OFF
VTS1
Bus VT fail Trip ON
VTS1
Bus VT fail Trip OFF
VTS1
Bus VT fail Block ON
VTS1
Bus VT fail Block OFF
VTS1
Line VT fail ON
VTS1
Line VT fail OFF
VTS1
Bus Fuse fail ON
VTS1
Bus Fuse fail OFF
VTS1
Line Fuse fail ON
VTS1
Line Fuse fail OFF
The function registers its operation into the last twelve (12) time-stamped registers. The register of the
function records the ON event process data for ACTIVATED, BLOCKED, etc. The table below
presents the structure of the function's register content.
Table. 5.6.2 - 291. Register content.
Date and time
Event
Volt 1, 2, 3,
4 status
System status
Input A, B, C, D
angle diff
Trip time
remaining
Used SG
dd.mm.yyyy
hh:mm:ss.mss
Event
name
0: No voltage
1: Voltage OK
2: Low
voltage
0: Bus dead
1: Bus live, VTS
OK, Seq. OK
2: Bus live, VTS
OK, Seq. reversed
3: Bus live, VTS
OK, Seq. undefined
4: Bus live, VTS fault
0.00...360.00deg
Time
remaining to
alarm
0...1800s
Setting group
1...8 active
A
AQ
Q-M257
-M257
Instruction manual
Version: 2.07
380
© Arcteq Relays Ltd
IM00021
Summary of Contents for AQ-M257
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