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The typical additional operate time increase is +2 ms for all the receiver
application functions (using either local or remote samples) when SMV is
used.
3.14.4.3
Operation principle
The
ALARM
in the receiver is activated if the synchronization accuracy of the sender or the
receiver is either unknown or worse than 100 ms. The output is held on for 10 seconds after
the synchronization accuracy returns within limits.
ALARM
is activated when two or more consecutive SMV frames are lost or late. A single
loss of frame is corrected with a zero-order hold scheme. In this case, the effect on
protection is considered negligible and the
WARNING
or
ALARM
outputs are not activated.
The output is held on for 10 seconds after the conditions return to normal.
The
SMV Max Delay
parameter defines how long the receiver waits for the SMV frames
before activating the
ALARM
output. This parameter can be accessed via
Configuration/
System/Common
. Waiting of the SMV frames also delays the local measurements of the
receiver to keep them correctly time aligned. The
SMV Max Delay
values include
sampling, processing and network delay.
The
WARNING
output in the receiver is activated if the synchronization accuracy of the
sender or the receiver is worse than 4 μs. The output is held on for 10 seconds after the
synchronization accuracy returns within limits.
The
WARNING
output is always internally active whenever the
ALARM
output is active.
3.14.4.4
Signals
Table 66:
RESTVTR Input signals
Name
Type
Default
Description
VG
INT32-UL0
0
IEC 61850-9-2 residual
voltage
Table 67:
RESTVTR Output signals
Name
Type
Description
ALARM
BOOLEAN
Alarm
WARNING
BOOLEAN
Warning
Section 3
1MAC059074-MB A
Basic functions
134
615 series ANSI
Technical Manual
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