16.21
Date Code 20171006 Instruction Manual SEL-400 Series Relays
DNP3 Communication
DNP3 Documentation
Analog Inputs
Analog inputs (Objects 30 and 32) are supported as defined by Table 16.8 The
default variation for both static and event inputs is defined by the AIVAR
(AIVARn for DNP3 LAN/WAN session n) setting. Only the Read function code
(1) is allowed with these objects.
Unless otherwise indicated, analog values are reported in primary units. Voltage
magnitudes below 0.10 volts and current magnitudes below 5 percent of I
NOM
are
forced to 0, as are their corresponding angles. Default scaling is indicated in the
product-specific instruction manual, but default scaling can be overridden by per-
point scaling in a custom DNP3 map. The DECPLA, DECPLV, and DECPLM
settings are the default scaling factors (in powers of 10) for current magnitudes,
voltage magnitudes, and miscellaneous magnitudes, respectively. See Configu-
rable Data Mapping on page 16.23 for more information.
Default dead bands are also indicated in the product-specific instruction manual
and may be overridden by per-point dead-band configuration. In general, the
ANADBA, ANADBV, and ANADBM settings are the default dead bands for cur-
rent magnitudes, voltage magnitudes, and miscellaneous magnitudes, respec-
tively. Dead bands are applied after any custom or default scaling factors. Events
are generated when values exceed dead bands.
Reading Relay Event Data
The relay provides protective relay event history information in one of two
modes: single-event or multiple-event access. Each DNP3 session begins in the
mode specified by Port setting EVEMODn (where n = 1–6 for Ethernet sessions
and not present for serial sessions). The selected mode is entered when the relay
is first enabled, when there is a DNP3 settings change, a DNP3 map change, or
an SER settings change. When EVEMODn = SINGLE, the relay powers up in
single-event mode. When EVEMODn = MULTI, the relay powers up in multiple-
event mode. A DNP3 session will switch to multiple-event mode if the session
DNP3 master sends a control to the NXTEVE binary output control point. The
DNP3 session will revert to the default mode after a power cycle or relay restart.
When a relay event occurs, (TRIP asserts, ER asserts, or TRI asserts) whose fault
location is in the range of MINDIST to MAXDIST, the data shall be made avail-
able to DNP3. If MINDIST is set to OFF, then there is no minimum. Similarly, if
MAXDIST is set to OFF, there is no maximum. Only SEL-4XX line relays sup-
port the MINDIST and MAXDIST settings.
In either mode, DNP3 events for all event summary analog inputs will be gener-
ated if any of them change beyond their dead band value after scaling (usually
whenever a new relay event occurs and is loaded into the event summary analog
inputs). Events are detected approximately twice a second by the scanning pro-
cess.
The specific fault data available and its encoding is relay specific. See Section 10:
Communications Interfaces in the product-specific instruction manual for infor-
mation on the relay reports fault data.
Single-Event Mode
Single-event mode provides the most recent tripping event. When a relay event
occurs and FLOC is in range of MINDIST and MAXDIST, these data are copied
to the DNP3 fault summary analog inputs, generating appropriate DNP3 events.
The relay shall then ignore any subsequent events for EVELOCK (Global set-
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