Ground wire is connected to the third pin of the plug point. It safe guards the user from ground fault when accidentally the phase wire touches the metal body of the appliance internally. I want to know how it is helpful in protecting the appliance itself.|||It has little effect on protecting the appliance. The only effect I can think of is protection from static discharges. If you have a static charge and touch the appliance and produce a spark, a metal case that is grounded provides good protection against that high voltage transient damaging any internal electronics. But in practice, I don't think this is very useful.
.|||The "green wire" ground is a personnel safety feature. It doesn't have much of a role in protecting the internal circuitry.
That doesn't mean it can't be used for some equipment protection. I have built surge protectors that routed power line surges from hot to ground and neutral to ground, instead of the more traditional hot to neutral.
There may also be a small protective role for equipment that has other electrical connections, such as TVs, computers, cable boxes, etc. But most of that equipment doesn't have the "green wire" ground.
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