ABB REG670 Applications Manual page 42

Section 2
Application
36
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.
This adaptive filtering is ensured by proper configuration and settings of all relevant
pre-processing blocks, see figure
REG670 IEDs such configuration and settings are already made and that three-phase
voltage at the generator terminals are used for frequency tracking. With such settings
REG670 will be able to properly estimate the magnitude and the phase angle of
measured current and voltage phasors in this wide frequency range.
Note that the following functions will then operate properly in the whole frequency
interval:
• Generator differential
• Transformer differential
• Four step overcurrent protection (DFT based measurement)
• Four step residual overcurrent protection
• Over/under voltage protection (DFT based measurement)
• Residual overvoltage protection
• Overexcitation protection
• General current and voltage protection
• Directional over/under power function
• Measurement function (that is, MMXU)
• and so on
Note that during secondary injection testing of this feature, it is absolutely necessary
to also inject the voltage signals used for frequency tracking even when a simple
overcurrent protection is tested.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
344 and 345. Note that in all pre-configured
1MRK 502 071-UEN -
Application manual