Section 2 Application
2.1 General IED application
SEMOD155704-4 v7
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 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.
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.
1MRK 502 071-UUS A Section 2
Application
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 39
Application manual
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