A novel fast distance relay for long transmission lines
Capacitances of the long line lower the distance protection performance. The basis of the relay is the theory of Equal Transfer Process of Transmission Lines. The differential equation algorithm using pi transmission line model is used. A low-pass filter and the virtual digital CCVT are used. The distance measuring error is within 5% at 12ms after fault occurrence.
long transmission line distance protection equal transfer process of transmission lines low-pass filter coupling capacitor voltage transformer virtual transfer method