Figure 568: Two parallel transformers and the horizontal connection via GOOSE to
transfer current and the phase angle information when the MCC principle is used
Configuration example for the Auto parallel (NRP) mode
The advantage of the Negative Reactance Principle (NRP) operation mode is that
no wiring or communication is needed between the IEDs. The voltage regulators
operate independently. However, for the cases where there is an occasional
stepwise change in the phase angle of the load, the regulating error can be
suppressed by an automatic setting group change or by changing the operation
mode with the logic.
Figure 569: Changing the operation mode of OLATCC automatically when the
capacitor bank is connected
1MRS757644 H
Control functions
620 series
Technical Manual
1071
