Description
The REG670 is used for protection, control and monitoring ofgenerators and generator-transformer blocks from relativelysmall units up to the largest generating units. The IED has acomprehensive function library, covering the requirements formost generator applications. The large number of analog inputsavailable enables, together with the large functional library,integration of many functions in one IED. In typical applicationstwo IED units can provide total functionality, also providing ahigh degree of redundancy. REG670 can as well be used forprotection and control of shunt reactors.
Stator earth fault protection, both traditional 95% as well as100% injection and 3rd harmonic based are included. When theinjection based protection is used, 100% of the machine statorwinding, including the star point, is protected under alloperating modes. The 3rd harmonic based 100% stator earthfault protection uses 3rd harmonic differential voltage principle.Injection based 100% stator earth fault protection can operateeven when machine is at standstill. Well proven algorithms forpole slip, underexcitation, rotor earth fault, negative sequencecurrent protections, and so on, are included in the IED.
The generator differential protection in the REG670 adapted tooperate correctly for generator applications where factors aslong DC time constants and requirement on short trip time havebeen considered.
By using patented algorithm REG670 (or any other productfrom 670 series) can track the power system frequency in quitewide range from 9Hz to 95Hz (for 50Hz power system). In orderto do that preferably the three-phase voltage signal from thegenerator terminals shall be connected to the IED. Then IED canadopt its filtering algorithm in order to properly measurephasors of all current and voltage signals connected to the IED.This feature is essential for proper operation of the protectionduring generator start-up and shut-down procedure.
Main brands include: ABB, Bailey, GE, FOXBORO, Invensys TRICONEX, Bentley BENTLY, A-B Rockwell, EMERSON EMERSON, B&R, MOTOROLA, FUANC, REXROTH, KUKA, HONEYWELL, NI, DEIF, Yokogawa, WOODWARD WOODWARD, Ryan, SCHNEIDER SCHNEIDER, Yaskawa, MOOG, EPRO, PROSOFT and other major brands
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