A. ionizing air
B. absorbing moisture
C. cleansing the transformer oil
D. cooling the transformer oil
Answer: B
B. absorbing moisture
C. cleansing the transformer oil
D. cooling the transformer oil
Answer: B
Explanation:
Silica Gel Breather of Transformer:
- When the transformer is loaded, the temperature of the transformer insulating oil increases, consequently the volume of the oil is increased.
- As the volume of the oil is increased, the air above the oil level in the conservator will come out.
- When the transformer is less load or no load, the temperature of the transformer insulating oil decreases, consequently the volume of the oil is decreased, which again causes air to enter into conservator tank.
- The natural air always consists of more or less moisture in it and this moisture can be mixed up with oil if it is allowed to enter into the transformer.
- The air moisture should be resisted during entering of the air into the transformer to overcome insulation failure or short circuit inside the transformer
- A silica gel breather is the most commonly used way of filtering air from moisture.
- Silica gel breather for transformer is connected with conservator tank by means of breathing pipe.
- Silica gel crystal has the property of absorbing moisture.
- When air passes through these crystals in the breather; the moisture of the air is absorbed by them, therefore, the air reaches the conservatory becomes quite dry.
- The oil in the oil sealing cup acts as a barrier between silica gel crystal and air when there is no flow of air through the silica gel breather.
- The color of silica gel crystal is dark blue but when it absorbs moisture it becomes pink.