1. Application
The Intelligent Electronic Device (IED) is used for the protection,
control and monitoring of overhead lines and cables in solidly,
impedance earthed or isolated networks. The IED can be used
up to the high 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 as back-up protection of power
transformers, reactors and so on.
Distance protection with quadrilateral or mho characteristics is
available. The full scheme distance protection provides
protection of power lines with high sensitivity and low
requirement on remote end communication. The six zones have
fully independent measuring and setting which gives high
flexibility for all types of lines. Load encroachment and adaptive
reach compensation are included.
The modern technical solution offers fast operating time of
typically less than one cycle.
The IED also includes an alternative for use on impedance
earthed or isolated networks. It includes phase preference logic
to select and trip only one line at cross-country faults.
The autorecloser for single-, two-, and/or three-phase tripping
and autoreclosing includes priority features for multi-breaker
arrangements. It co-operates with the synchrocheck function
with high-speed or delayed reclosing.
A high impedance differential protection can be used to protect
T-feeders or line reactors.
High set instantaneous phase and earth overcurrent, four step
directional or non-directional delayed phase and earth
overcurrent, sensitive earth fault for not direct earthed systems,
thermal overload and two step under and overvoltage
protection are examples of the available functions allowing the
user to fulfill any application requirement.
The distance phase and earth fault protection, and the
directional earth overcurrent protection can communicate with
remote end in any teleprotection communication scheme. With
the included remote communication, following the IEEE C37.94
standard, up to 192 channels for intertrip and binary signals are
available per LDCM communication module in the
communication between the IEDs.
The IED can also be provided with full bay control and
interlocking functionality including co-operation with the
synchrocheck function to allow integration of the main or back-
up control.
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/UCA
61850-9-2LE process bus with up to eight 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.
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 and so on. The
graphical configuration tool with delay mode, ensures simple
and fast testing and commissioning.
Disturbance recorder and fault locator are available to allow
independent post-fault analysis after primary disturbances.
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.
Flexible Product Naming allows the customer to use an IED-
vendor independent IEC 61850 model of the IED. This
customer model will be used as the IEC 61850 data model, but
all other aspects of the IED will remain unchanged (e.g., names
on the local HMI and names in the tools). This offers significant
flexibility to adapt the IED to the customers' system and
standard solution.
Communication via optical connections ensures immunity
against disturbances.
Four packages have been defined for the following
applications:
• Single breaker, 1/3 phase tripping, isolated or high
impedance earthed systems (A41)
• Single breaker, 1/3 phase tripping (A42)
• Multi breaker, 1/3 phase tripping (B42)
• Single breaker, 1/3 phase tripping, with PMU (D42)
Optional functions are not configured but a maximum
configuration with all optional functions are available as
template in the application 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.
1MRK 506 372-BEN -
Line distance protection REL670 2.2
Product version: 2.2 Issued: May 2017
Revision: -
ABB 3