Application - ABB Relion 670 Series Product Manual

Generator protection REG670
Version 2.2

2. Application

The REG670 is used for protection, control and
monitoring of generators and generator-transformer
blocks from relatively small units up to the largest
generating units. The IED has a comprehensive function
library, covering the requirements for most generator
applications. The large number of analog inputs
available enables, together with the large functional
library, integration of many functions in one IED. In
typical applications two IED units can provide total
functionality, also providing a high degree of
redundancy. REG670 can as well be used for protection
and control of shunt reactors.
Stator earth fault protection, both traditional 95% as
well as 100% injection and 3rd harmonic based are
included. When the injection based protection is used,
100% of the machine stator winding, including the star
point, is protected under all operating modes. The 3rd
harmonic based 100% stator earth fault protection uses
3rd harmonic differential voltage principle. Injection
based 100% stator earth fault protection can operate
even when machine is at standstill. Well proven
algorithms for pole slip, underexcitation, rotor earth
fault, negative sequence current protections, and so on,
are included in the IED.
The generator differential protection in the REG670
adapted to operate correctly for generator applications
where factors as long DC time constants and
requirement on short trip time have been considered.
As many of the protection functions can be used as
multiple instances there are possibilities to protect
more than one object in one IED. It is possible to have
protection for an auxiliary power transformer integrated
in the same IED having main protections for the
generator. The concept thus enables very cost effective
solutions.
The REG670 also enables valuable monitoring
possibilities as many of the process values can be
transferred to an operator HMI.
4
SEMOD155704-4 v7
© Copyright 2017 Hitachi Power Grids. All rights reserved
The wide application flexibility makes this product an
excellent choice for both new installations and for
refurbishment in existing power plants.
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 IEC 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). This offers significant flexibility to
adapt the IED to the customers' system and standard
solution.
Communication via optical connections ensures
immunity against disturbances.
By using patented algorithm REG670 (or any other
product from 670 series) can track the power system
frequency in quite wide range from 9Hz to 95Hz (for
50Hz power system). In order to do that preferably the
three-phase voltage signal from the generator terminals
shall be connected to the IED. Then IED can adopt its
filtering algorithm in order to properly measure phasors
of all current and voltage signals connected to the IED.
This feature is essential for proper operation of the
protection during generator start-up and shut-down
procedure.
REG670 can be used in applications with the IEC/UCA
61850-9-2LE process bus with up to eight merging units
(MU) depending on the other functionality included in
the IED.
1MRK 502 074-BEN M
M11788-3 v11
GUID-99777C26-F53E-4D5D-B0C6-640597A2A2FD v5
Hitachi Power Grids