Application - ABB Relion REG670 Product Manual

ABB
Generator protection REG670 ANSI
Customized
Product version: 1.2

1. 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 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 ground 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 ground fault protection can operate even
when machine is at standstill. Well proven
algorithms for pole slip, underexcitation, rotor
ground 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.
Serial data communication is via optical
connections to ensure immunity against
disturbances.
The wide application flexibility makes this product
an excellent choice for both new installations and
the refurbishment of existing installations.
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. 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.
1MRK 502 031-BUS B
Issued: May 2012
Revision: B
3