Study and Analysis of the Offset Mho Characteristics for the Loss of Excitation Protection of an Alternator
| Author(s) | : | S. Praveen Kumar, K. Narasimha Rao, Y. Krishna Mohan |
| Institution | : | Department of Electrical and Electronics Engineering, Gayatri Vidya Parishad College of Engineering (A) |
| Published In | : | Vol. 7, Issue 5 — May 2020 |
| Page No. | : | 10-18 |
| Domain | : | Engineering |
| Type | : | Research Paper |
| ISSN (Online) | : | 2348-4470 |
| ISSN (Print) | : | 2348-6406 |
Loss of Excitation threatens the generator and power system stability. Several criteria have been proposed forloss of excitation detection and some of them are field under voltage/current criterion, impedance criterion, reversereactive power criterion etc. Among them impedance boundary of steady state stability limit (SSSL) is widely used. Butthis criterion is sensitive to the variation of output active power of synchronous generator and may mal-operate inexternal faults, power swings and other non-LOE condition. In this study a Novel adaptive protection criterion with anoffset mho element based on SSSL is used to distinguish LOE from non-LOE condition. This adaptive criterion couldautomatically adapt to the system operating modes and correctly operate in LOE condition. The impedance boundarycircle of the steady state stability limit can adaptively fit for operating modes. The simulation results show that theadaptive impedance criterion is better for reliable protection against LOE and non-LOE condition.
S. Praveen Kumar, K. Narasimha Rao, Y. Krishna Mohan, “Study and Analysis of the Offset Mho Characteristics for the Loss of Excitation Protection of an Alternator”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 7, Issue 5, pp. 10-18, May 2020.
