Feeder Terminal
REF 541, REF 543, REF 545.
1MRS750443-MBG
5
and reactive power and power factor. In addi-
tion, other measurement functions are avail-
able.
As a standard feature the REF 54_ terminal
includes pulse counter inputs. The number of
pulse inputs varies from 7 (REF 541) to 10
(REF 545) according to the REF variant.
Disturbance recorder
The transient disturbance recorder is able to
record 16 current or voltage waveforms and
16 logic digital signals. The sampling fre-
quency of the analogue inputs is 2 kHz at the
rated frequency of 50 Hz and 2.4 kHz at the
rated frequency of 60 Hz.
The user can set the length of a recording
within a range determined by the number of
analogue inputs used. The number of record-
ings depends on the sampling frequency,
length of recordings and number of analogue
inputs.
The recordings can be uploaded with a DR-
Collector Tool which converts the data to a
COMTRADE format. The DR-Collector Tool
is supported in CAP501 and CAP505 relay
tools.
Power quality functions
Power quality functions enable measurement
of total harmonic distortion (THD) of voltage
and current, and total demand distortion
(TDD) of current. Individual harmonics are
measured up to 13th.
Power quality functions also include mea-
surement of short duration voltage variations
like sags, swells and short interruptions. Mea-
surements are done according to the IEC stan-
dard 61000-4-30.
LIB 510 supports tools for presentation of
harmonics and short duration voltage varia-
tions.
Control functions
The control functions are used to indicate the
position of switching devices, i.e. circuit
breakers and disconnectors, and to execute
open and close commands for controllable
switching devices in the switchgear. Further-
more, there are supplementary functions for
control logic purposes, e.g. on/off switches,
MIMIC alarm, LED control, numerical data
for the MIMIC and logic controlled position
selection.
The control functions configured using the
Relay Configuration Tool
can be associated
with position indicators that are part of the
MIMIC configuration picture displayed on
the HMI. Position indicators are used to indi-
cate the position of switching devices via the
MIMIC picture and to control them locally.
The status of different objects, e.g. open/
close/undefined, displayed in the MIMIC
view can be freely designed.
Fault locator
The fault locator function for radial distribu-
tion systems. Short-circuit localization in all
kind of distribution networks. Earth-fault
localization in effectively earthed networks
and in low reactance/low resistance earthed
networks. Assists fast power restoration after
the fault. Improves system availability and
performance.
Condition monitoring functions
Condition monitoring function blocks such as
supervision of the energizing current and
voltage input circuit, operation time counter,
circuit breaker electric wear, scheduled main-
tenance, trip circuit supervision and breaker
travel time are available for the REF 54_
feeder terminals.
General functions
Additional functions are available for differ-
ent general purposes to be used in logics such
as activation of HMI backlight, switchgroups,
and resetting of operation indications, latched
output signals, registers and disturbance
recorder.
Communication functions
The REF 54_ feeder terminal provides the
IEC 60870-5-103, IEC 61850, Profibus-
DPV1, Modbus, DNP 3.0, SPA and LON
serial communication protocols.
In a customer-specific feeder terminal config-
uration, special events can be generated via
an EVENT230 event function.
Standard functions
Standard functions are used for logics such as
interlocking, alarming and control sequenc-
ing. The use of logic functions is not limited
and the functions can be interconnected with
each other as well as with protection, mea-
surement, power quality, control, condition
monitoring and general functions. In addition,
the digital inputs and outputs as well as LON
inputs and outputs can be connected to stan-
dard functions by using the
Relay Configura-
tion Tool
.
