The protection of busbar demands high integrity and
high speed relaying scheme. This paper presents a new
differential relaying scheme for the protection of busbar. The
proposed scheme depends on the difference of the value of
incoming and outgoing line currents of the respective phase at a
particular bus. The proposed scheme has been tested extensively
using the PSCAD/EMTDC software package with fault data
generated, by modeling the existing 230 kV Indian power
transmission systems. The proposed scheme provides stability
against external faults, more sensitivity towards high resistance
faults and better reliability in discriminating in-zone and out of
zone faults. Moreover, the proposed scheme avoids the effect of
early & severe CT saturation during heavy through faults.