Video narration
Agar Buchholz relay fault current ko seedhe nahin maapta, to transformer ke andar chhipi kharabi ko pehchanta kaise hai? Ise overhead water tank ke float switch jaisa samajhiye: liquid level badle, float neeche jaaye, aur switch operate ho. Transformer mein yeh relay main tank aur conservator ke beech oil pipe mein laga hota hai. Ek developing internal fault insulation aur oil se gas banata hai. Gas relay mein jama hokar upper float ko neeche karti hai aur alarm shuru ho jata hai. Lekin severe fault mein pratikriya alag hai. Tez oil surge lower element ko operate karta hai aur transformer turant trip ho jata hai. Yeh suraksha conservator wale oil-filled transformer ke internal faults ke liye hai, har external fault ke liye nahin. To jawab: yeh current nahin, oil ka vyavahar dekhta hai - dheemi gas accumulation alarm deti hai; khatarnak oil movement transformer ko trip karati hai.