ABB RELION Series, Техническое руководство

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3.13.3.6 Monitored data
Monitored data is available in three locations.
• Monitoring/I/O status/Analog inputs
• Monitoring/IED status/SMV traffic
• Monitoring/IED status/SMV accuracy
3.13.4 RESTVTR function block
3.13.4.1 Function block
GUID-2277C7AC-5194-4819-BAC4-A71A32E4C439 V1 EN
Figure 47: Function block
3.13.4.2 Functionality
The RESTVTR function is used in the receiver application to perform the supervision
for the sampled values of analog residual voltage and to connect the received analog
residual voltage input 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.
3.13.4.3 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.
1MRS758755 A
Section 3
Basic functions
REC615 and RER615 105
Technical Manual