Schweitzer Engineering Laboratories SEL-421-4, Instruction Manual

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19.7
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Remote Data Acquisition
IEC 61850-9-2 Sampled Values (SV)
The Port 5 settings NETMODE and NETPORT determine and configure the
Ethernet ports used for the station bus and the process bus. The NETMODE set-
ting applies only to the station bus, and gives the user the ability to set the desired
network redundancy mode in the device. The NETPORT setting determines
which pair of Ethernet ports the SV device will use for its station bus. The SV
device will use the other pair of Ethernet ports for the process bus. For example,
if NETPORT = A or B, the station bus will be on Ethernet Ports 5A and 5B with
the process bus on Ports 5C and 5D. SV process bus ports only operate in
FAILOVER mode. Refer to
Ethernet Communications on page 15.6 for more
information on Ethernet network operation and using redundant Ethernet ports.
Benefits of a 9-2LE SV System
Some of the benefits of a 9-2LE SV system include:
➤
Set the relay as you would conventional SEL-400 series relays
through use of QuickSet and
AC
SEL
ERATOR
Architect SEL-5032
Software.
➤
Decrease costs through copper reduction and data sharing.
➤
Increase safety in the substation by removing high-energy cables
from the control house. This also eliminates the concern of an open
circuited CT when a relay is removed from service.
SV Publication
SV Publication Capability
Some SEL-400 series relays are available with the capability for SV publication.
Enabling SV publication through settings (Port 5 setting SVTXEN > 0 or via
CID file) enables the merging unit functionality of the device. The SV publica-
tion capability of each SEL SV publishing devices is identical, so throughout this
section, SEL devices with SV publication enabled are referred to as SV publish-
ers.
The SV publisher digitizes the data from its voltage and current inputs, records
its current state of time synchronization, scales these values to primary units by
using the CT and PT ratio settings, and then transmits these values in accordance
with the 9-2LE guideline. SEL SV publishers support the “MSVCB01” model of
the multicast SV control block described in the guideline, which includes a single
application service data unit (ASDU). The transmission rate is 80 samples per
nominal frequency cycle. If the nominal frequency setting of the SV publisher
NFREQ = 50 Hz or 60 Hz, the SV transmission rate is 4000 or 4800 samples per
second, respectively.
The SV publisher can publish as many as seven SV streams simultaneously. SV
publication is independent of the protection elements, so protection functionality
remains secure even when the SV publisher is publishing the maximum number
of SV streams.
Because multiple SV streams may be received by a single subscriber, all streams
usually require time-alignment to a time source with an accuracy of <1 µs. SV
messages indicate the synchronization state of the SV publisher at the time the
sample was taken. This value, smpSynch in the SV message, will be 0, 1, or 2, to
indicate whether the merging unit was synchronized with a global time source
(2), a local time source (1), or an internal clock (0). If the SV publisher is syn-
chronized with an IEEE 1588 Precision Time Protocol (PTP) time source that
uses the PTP Power Profile (C37.238), the smpSynch value is equal to the ID of
the grandmaster clock, usually a value between 5 and 254.