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-pole. 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.
A high impedance differential protection can be used to protect
T-feeders or line reactors.
The auto-reclose for single-, two- and/or three pole reclosing
includes priority circuits for multi-breaker arrangements. It co-
operates with the synchronism check function with high-speed
or delayed reclosing.
High set instantaneous phase and ground overcurrent, four
step directional or non-directional delayed phase and ground
overcurrent, thermal overload and two step under- and
overvoltage functions are examples of the available functions
allowing the user to fulfill any application requirement.
The IED can also be provided with a full control and interlocking
functionality including co-operation with the synchronism check
function to allow integration of the main or back-up control.
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.
Line differential protection RED670 ANSI
1MRK505226-BUS D
Customized
Product version: 1.2 Issued: February 2015
Revision: D
ABB 3
