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hello every body
a strange problem happens when Battery DC supply get mixed with AC component (due to charger earth fault) in a power transmission substation.
some devices (Bay control units, tele-protection equipments,...) malfunctioning and their Digital Inputs get triggered even though, there is no actual input from field.
I wonder, how is that happens? bad input circuitry design? what is the theory of DI interface circuits used in todays protection and control equipments?
any discussion or comments will be highly appreciated.
thank you.
a strange problem happens when Battery DC supply get mixed with AC component (due to charger earth fault) in a power transmission substation.
some devices (Bay control units, tele-protection equipments,...) malfunctioning and their Digital Inputs get triggered even though, there is no actual input from field.
I wonder, how is that happens? bad input circuitry design? what is the theory of DI interface circuits used in todays protection and control equipments?
any discussion or comments will be highly appreciated.
thank you.