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.
3.14.3.3
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 8 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
MINCB_OPEN
input signal is supposed to be connected through a protection
relay's binary input to the NC auxiliary contact of the miniature circuit breaker
protecting the VT secondary circuit. The
MINCB_OPEN
signal sets the
FUSEF_U
output signal to block all the voltage-related functions when MCB is in the open
state.
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.
The receiver activates the
WARNING
and
ALARM
outputs if any of the quality bits,
except for the derived bit, is activated. When the receiver is in the test mode,
it accepts SMV frames with test bit without activating the
WARNING
and
ALARM
outputs.
3.14.3.4
Signals
Table 65: ULTVTR Input signals
Name
Type
Default
Description
UL1
INT32-UL1
0
IEC61850-9-2 phase 1 voltage
UL2
INT32-UL2
0
IEC61850-9-2 phase 2 voltage
UL3
INT32-UL3
0
IEC61850-9-2 phase 3 voltage
MINCB_OPEN
BOOLEAN
0
Active when external MCB opens
protected voltage circuit
Basic functions
1MRS757644 H
136
620 series
Technical Manual
