Application - ABB RED670 Product Manual

ABB
Line differential protection RED670
Pre-configured
Product version: 1.1
Pre-configured

1. Application

RED670 is used for the protection, control
and monitoring of overhead lines and cables
in all types of networks. The IED can be used
from distribution up to the highest voltage
levels. It is suitable for the protection of
heavily loaded lines and multi-terminal lines
where the requirement for tripping is one-,
two-, and/or three-phase. The IED is also
suitable for protection of cable feeders to
generator block transformers.
The phase segregated current differential
protection provides an excellent sensitivity
for high resistive faults and gives a secure
phase selection. The availability of six
stabilized current inputs per phase allows use
on multi-breaker arrangements in three
terminal applications or up to five terminal
applications with single breaker
arrangements. The communication between
the IEDs involved in the differential scheme
is based on the IEEE C37.94 standard and can
be duplicated for important installations
when required for redundancy reasons.
Charging current compensation allows high
sensitivity also on long overhead lines and
cables. A full scheme distance protection is
included to provide independent protection
in parallel with the differential scheme in
case of a communication channel failure for
the differential scheme. The distance
protection then provide protection for the
entire line including the remote end back up
capability either in case of a communications
failure or via use of an independent
communication channel to provide a fully
redundant scheme of protection (that is a
second main protection scheme). Eight
channels for intertrip and other binary signals
are available in the communication between
the IEDs.
The auto-reclose for single-, two- and/or
three phase reclosing includes priority
circuits for multi-breaker arrangements. It co-
operates with the synchronism check
function with high-speed or delayed reclosing.
1MRK 505 188-BEN C
High set instantaneous phase and earth
overcurrent, four step directional or un-
directional delayed phase and earth
overcurrent, thermal overload and two step
under- and overvoltage functions are
examples of the available functions allowing
the user to fulfill any application requirement.
Disturbance recording and fault locator are
available to allow independent post-fault
analysis after primary disturbances. The
Disturbance recorder will also show remote
station currents, as received to this IED, time
compensated with measure communication
time.
Out of Step function is available to separate
power system sections close to electrical
centre at occurring out of step.
The advanced logic capability, where the user
logic is prepared with a graphical tool, allows
special applications such as automatic
opening of disconnectors in multi-breaker
arrangements, closing of breaker rings, load
transfer logics etc. The graphical
configuration tool ensures simple and fast
testing and commissioning.
A loop testing function allows complete
testing including remote end IED when local
IED is set in test mode.
Serial data communication is via optical
connections to ensure immunity against
disturbances.
The wide application flexibility makes this
product an excellent choice for both new
installations and the refurbishment of existing
installations.
Four packages has been defined for following
applications:
• Single-breaker (double or single bus)
with three phase tripping (A31)
• Single-breaker (double or single bus)
with single phase tripping (A32)
• Multi-breaker (one-and a half or ring)
with three phase tripping (B31)
• Multi-breaker (one-and a half or ring)
with single phase tripping (B32)
Issued: June 2010
Revision: C
3