Ultvtr Function Block; Function Block; Functionality; Operation Principle - ABB RELION 620 Series Technical Manual

Section 3
Basic functions
3.14.3
3.14.3.1
3.14.3.2
3.14.3.3
128

ULTVTR function block

Function block

GUID-16BA49F4-A98B-40FD-B24A-C2101053E1CA V2 EN
Figure 44: Function block

Functionality

The ULTVTR function is used in the receiver application to perform the supervision
for the sampled values and to connect the received analog phase voltage inputs to the
application. Synchronization accuracy, sampled value frame transfer delays and
missing frames are being supervised.
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.

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 MINCB_OPEN input signal is supposed to be connected through an IED 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.
1MRS757644 F
620 series
Technical Manual