Application - ABB Relion 670 Series Product Manual

Line differential protection RED670 2.0
Product version: 2.0

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.
A high impedance differential protection can be used to protect
T-feeders or line reactors.
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.
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.
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.
ABB
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 IED can be used in applications with IEC 61850-9-2LE
process bus with up to six merging units (MU) depending on
other functionality included in the IED.
Each MU has eight analogue channels, normally four currents
and four voltages. Conventional and Merging Unit channels can
be mixed freely in the application.
The logic is prepared with a graphical tool. The advanced logic
capability 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.
Communication via optical connections ensures immunity
against disturbances.
Four packages have 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)
Optional functions are not configured but a maximum
configuration with all optional functions are available as
template in the graphical configuration tool. Analog inputs and
binary input/output signals are pre-defined for basic use. Other
signals may be required by each particular application.
Add binary I/O boards as required for the application when
ordering.
"Basic IED functions"
1MRK505310-BEN C
Issued: July 2016
Revision: C
3