Conductor with higher temperature ratings, provide the ampacity is determined based on the 60°C ampacity of the conductor.
For lagging power factor = (IR*cosφ + IXsinφ)/V_r
For leading power factor = (IR*cosφ - IXsinφ)/V_r
Zero voltage regulation occurs on leading power factor only.
In single phase energy meter,
Current coil is made up from thick wire having few no. of turns.
Pressure coil is made up from thin wire having more no. of turns.
Buchholz relay is gas operated relay.
It will operate when internal fault occurs in transformer.
It is placed between tank to main conservator.
It has two contacts trip and alarm.
Use of Buchholz relay in distribution transformer is not economical.