Voltage protection blocked in case
SMV voltages unavailable/unreliable
Directional protection changed to non-directional
scheme in case:
- SMV voltages unavailable/unreliable. OR
- SMV angle information inaccurate
GUID-2E245F6E-18DB-4F43-9615-82C368DC97DD V3 EN
Figure 48: Application Configuration tool logic example for the SMV applications
The receiver activates the TxTR 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 TxTR WARNING and ALARM
outputs.
The TxTR WARNING 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 TxTR ALARM in the receiver is activated if the synchronization accuracy of the
sender or the receiver is unknown, worse than 100 ms or two or more consecutive
frames are lost. The output is held on for 10 seconds after the synchronization
accuracy returns within limits.
Quality of received SMV is available as outputs in SMV measuement function block
and not propagated directly to protection function blocks along with the SMV
measurement values. To handle situations where SMV is not available, its quality is
not good or there is an issue with time synchronization, the WARNING and ALARM
outputs of SMV measurement function blocks must be connected to application, for
example to block directional protection.
1MRS757809 C Section 6
Process bus and IEEE 1588 time synchronization
REC615 and RER615 71
Engineering Guide
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