| Abstract: |
| In this work, a directional relaying algorithm is proposed for transmission line to prevent relay maloperation during
coupling capacitor voltage transformer (CCVT) subsidence transient. The effect of CCVT subsidence transient during
single-pole-tripping condition is highlighted in this paper. The proposed method which is based on phase
angle difference of post fault and prefault positive sequence current can help the directional relay to take
accurate decision during erroneous CCVT secondary response. The available CCVT model in PSCAD is not able
to generate significant subsidence transient in the secondary side. So, a new CCVT model is developed in
EMTDC/PSCAD domain for transient response analysis and to check the relay operation. Next, the performance of
different voltage and current information based directional relaying techniques have been analyzed and compared
with the proposed method. The results are evaluated for different system and fault conditions. Results demonstrate the
accuracy of the proposed method. |
| Key words: System impedance ratio (SIR), Voltage peak transient, Voltage zero transient, Ferroresonance suppressioncircuit (FSC), Fault resistance, Protection of transmission line |
| DOI：10.1186/s41601-017-0038-0 |
|
| Fund: |
|
