• Support for the IEEE 1588 v2 time synchronization
• Preferably IEEE 1588 v2 according to the Power Profile and implementation
according to the one-step mode
• All network devices between the IEEE 1588 v2 clock master and the IED must
support IEEE 1588 v2
Ethernet switch requirements
• Support for the IEEE 1588 v2 transparent-clock operation mode to enable
accurate time synchronization in the system
• Preferably managed switch capabilities for SMV filtering and VLAN to restrict
the flow of SMV only to devices using it
IEEE 1588 v2 master clock requirements
• Support for IEEE 1588 v2 Grand Master operation mode
• Clock accuracy of ±1 µs or better to enable accurate enough sampled measured
values
6.3 SMV system configuration
The SMVSENDER function block must be added to the ACT configuration of the
SMV sender IED to activate SMV sending. By doing this the sampled value control
block and the related data set are automatically added to the IED configuration. SVCB
and the data set are defined by 9-2 LE in which the data set consists of four currents
and four voltages with quality attributes. IED sends the residual voltage as a calculated
value when there is no physical neutral voltage input available in the IED. IEC
61850-9-2 LE defines a sample rate of 4000 samples per second in 50 Hz system.
The default data set for SMV sending is fixed and should not be
modified.
If SMVSENDER is used in RED615, the SMVSENDER function
block should also be added to the configuration of the other RED615.
SMVSENDER can be disabled, if it is not used in the second RED615.
The SMV Max Delay parameter must be in same position at both ends.
Due to the high time accuracy requirement of SMV the used time synchronization
method must be IEEE 1588 v2. PTP priorities of IEDs and other IEEE 1588 v2 devices
in the network need to be configured properly (smaller value means highest priority)
for best master clock algorithm in 1588. External accurate master clocks must be set
with highest priority and if the IED is selected as backup, master clock priorities
should be set accordingly in all IEDs.
1MRS757809 C Section 6
Process bus and IEEE 1588 time synchronization
REC615 and RER615 65
Engineering Guide
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