Abstract—Catastrophic circumstances and equipment failures in
electrical networks are mostly caused by emerging unidentified
phenomena. Resonance and Ferroresonance are those
phenomena, which have been investigated since, many years ago.
Manitoba Hydro 230 kV electrical network has experienced
Ferroresonant states several times. Such conditions may occur in
effect of short circuit, breaker phase failure, transformer
energizing, load rejection, accidental or scheduled line
disconnection, and plant outage. One of the significant
consequences of resonant and Ferroresonant states can be an
apparent mis-operation or tripping some protective devices and
inaccurate operation of instrument transformers. In this paper by
means of PSCAD/EMTDC simulation software, Ferroresonant
states are analyzed in Manitoba Hydro 230 kV network. Ferro-
resonant states are classified in to adequate modes by Ferro-
resonance detection tools, furthermore; kinds of protective relays
subjected to Ferroresonance are simulated in the power network,
and operation of relays is assessed.