Numerical relay settings calculations for small HPP Krcic
Abstract
The paper deals with the problem of calculating and selecting the parameters for setting the protection functions of the electrical protection system generator - block transformer in the Krcic SHPP. The following protection functions, among others, were analyzed in detail: overcurrent protection in two stages of operation: overvoltage and undervoltage protection in two stages of operation: overfrequency and underfrequency protection in two stages of operation: protection against reverse power, overload, asymmetric load and generator runaway. Several different monitoring functions of the generator were also analyzed. The calculation of the expected generator short circuit, the calculation of temporary overvoltages on the generator (sudden load loss) and other related analyses were made.
