Schweitzer Engineering Laboratories SEL-700G Series Instruction Manual Download

Page: 627 / 824

D.23

Date Code 20170814

Instruction Manual

SEL-700G Relay

DNP3 Communications

DNP3 Documentation

Unless otherwise indicated, analog values are reported in primary units. See
Appendix K: Analog Quantities for a list of all available analog inputs. A
dead-band check is done after any scaling has been applied. For all currents,
the default scaling is the DECPLA setting on magnitudes and scale factor of
100 on angles. The default dead band for currents is ANADBV on magnitudes
and ANADBM on angles.

For all voltages, the default scaling is the DECPLV setting on magnitudes and
scale factor of 100 on angles. The default dead band for voltages is ANADBV
on magnitudes and ANADBM on angles. For all powers and energies, the
default scaling is the DECPLM setting and default dead band is ANADBM.
For all other quantities, the default scaling is 1 and default dead band is
ANADBM.

You can use per-point scaling and dead band to override default scaling and
dead bands. See Configurable Data Mapping on page D.23 for more
information. Dead bands for analog inputs can also be modified by writing to
object 34.

A dead-band check is done after any scaling has been applied. Event class
messages are generated whenever an input changes beyond the value given by
the appropriate dead-band setting. The voltage and current phase angles only
generate an event if, in addition to their dead-band check, the corresponding
magnitude changes beyond its own dead band. Analog inputs are scanned at
approximately a 1 second rate, except for Fault analog inputs below. All
events generated during a scan use the time the scan was initiated.

Configurable Data
Mapping

One of the most powerful features of the SEL-700G implementation is the
ability to remap DNP3 data and, for analog values, specify per-point scaling
and dead bands. Remapping is the process of selecting data from the reference
map and organizing it into a data subset optimized for your application. The
SEL-700G uses object and point labels, rather than point indices, to streamline
the remapping process. This enables you to quickly create a custom map
without having to search for each point index in a large reference map.

You can use any of the three available DNP3 maps simultaneously with as
many as three unique DNP3 masters. Each map is initially populated with
default data points, as described in Default Data Map on page D.19. You can
remap the points in a default map to create a custom map with as many as:

➤

100 Binary Inputs

➤

32 Binary Outputs

➤

100 Analog Inputs

➤

32 Analog Outputs

➤

32 Counters

You can use the SHOW DNP x <Enter> command to view the DNP3 data
map settings, where x is the DNP3 map number from 1 to 3. See Figure D.3
for an example display of map 1.

NOTE:

Dead-band changes via

Object 34 are not stored in
nonvolatile memory. Make sure to
reissue the Object 34 dead-band
changes you want to retain after a
change to DNP port settings, issuing a
STA C command, or a relay cold-start
(power-cycle).

Schweitzer Engineering Laboratories SEL-700G Series, Instruction Manual

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