New adaptive non-communication TL protection scheme with three phase auto-reclosing

Abstract EN

In This paper a new adaptive non-communication method offers 100% Over Head Transmission Line fault clearance instantaneously, is presented.

This Adaptive scheme adjusts distance Measuring Protection covering full TL in First zone with out waiting the communication intertripping signals, with high percentage successful three phase Auto- Reclosing rate.

This has been achieved by arrangement of three instantaneous, fundamental frequency, rms Under voltage Supervisory Relays controlling Auto-Reclosing command applied to the Circuit Breaker.

The researchers presented a new philosophy to restore Over Head TL in more reliable and dependable method than the common existing one.

The method utilizes a three phase monitoring Voltage Relay at each end of the OHTL which control the Reclosing Command.

This new method is applicable approximately to all types of TL protection Relays (conventional or Modern Numerical Relays).