1. Application
SEMOD155704-4 v6
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.
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 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
M11788-3 v10
Communication via optical connections ensures immunity
against disturbances.
GUID-99777C26-F53E-4D5D-B0C6-640597A2A2FD v4
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
61850-9-2LE process bus with up to six merging units (MU)
depending on the other functionality included in the IED.
1MRK 502 068-BEN D
Generator protection REG670 2.1 IEC
Product version: 2.1
Issued: June 2017
Revision: D
ABB
3
