Application - Hitachi Relion 670 Series Product Manual

Line differential protection RED670
Version 2.2

2. Application

The Intelligent Electronic Device (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 provides
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). There are 8 signals (with
64 kbps) and 192 signals (with 2 Mbps) 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 backup control.
Disturbance recording and fault locator are available to
allow independent post-fault analysis after primary
Hitachi Energy
M13635-3 v10
disturbances. The Disturbance recorder will also show
remote station currents, as received to this IED, time
compensated with measure communication time.
The fault locator in the IED is an essential complement to
other monitoring functions, since it measures and indicates
the distance to the fault with high accuracy. The function
constitutes of both single ended and two ended based fault
locators.
The two ended fault locator requires two RED670 IEDs at
the local and remote ends, which are connected through
LDCM 2Mbps communication to transmit and receive the
signals. The signals transmitted through the LDCM should
be of primary values. The signals needed are both side;
three phase voltages and three phase currents.
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 the other functionality included in the
IED. Each MU has eight analog channels, four currents and
four voltages. Conventional and Merging Unit channels can
be mixed freely in the application.
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.
IED supports COMTRADE1999 and COMTRADE2013
formats which can be selected in Parameter Setting Tool
(PST) of PCM600 or via LHMI.
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.
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.
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