1. Application
The IED 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.
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.
If IEC 61850-9-2LE communication is
interrupt, data from the merging units (MU)
after the time for interruption will be
incorrect. Both data stored in the IED and
displayed on the local HMI will be corrupt.
For this reason it is important to connect
signal from respective MU units
(SMPLLOST) to the disturbance recorder.
Forcing of binary inputs and outputs is a convenient way to test
wiring in substations as well as testing configuration logic in the
IEDs. Basically it means that all binary inputs and outputs on the
IED I/O modules (BOM, BIM, IOM & SOM) can be forced to
arbitrary values.
Central Account Management is an authentication
infrastructure that offers a secure solution for enforcing access
control to IEDs and other systems within a substation. This
incorporates management of user accounts, roles and
certificates and the distribution of such, a procedure completely
transparent to the user.
The Flexible Product Naming allows the customer to use an
IED-vendor independent 61850 model of the IED. This
customer model will be exposed in all IEC 61850
communication, but all other aspects of the IED will remain
unchanged (e.g., names on the local HMI and names in the
tools).
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.
Forcing of binary inputs and outputs is a convenient way to test
wiring in substations as well as testing configuration logic in the
IEDs. Basically it means that all binary inputs and outputs on the
IED I/O modules (BOM, BIM, IOM & SOM) can be forced to
arbitrary values.
Central Account Management is an authentication
infrastructure that offers a secure solution for enforcing access
control to IEDs and other systems within a substation. This
incorporates management of user accounts, roles and
1MRK 505 346-BEN -
Line differential protection RED670 2.1 IEC
Product version: 2.1 Issued: December 2015
Revision: -
ABB 3
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