Application - Hitachi Relion REL670 Product Manual

Line distance protection REL670
Version 2.2

2. 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 backup
protection of power transformers, reactors and so on.
With high functional integration capability, the protection of
two overhead lines, one as the main and another as the
backup, can be achieved using a single IED. When
deployed in such applications, this can lead to overall cost
savings including reduced engineering.
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
backup control.
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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.
IED supports COMTRADE1999 and COMTRADE2013
formats which can be selected in Parameter Setting Tool
(PST) of PCM600 or via LHMI.
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.
Ready to use pre-configured application packages:
• Single breaker, 1/3 phase tripping, isolated or high
impedance earthed systems (A41), see
• Single breaker, 1/3 phase tripping (A42), see
• Multi breaker, 1/3 phase tripping (B42), see
• Single breaker, 1/3 phase tripping, with PMU (D42),
seeFigure 2.4
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Figure 2.1
Figure 2.2
Figure 2.3
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