In a transformer Use of silica gel in transformer breather remove moisture and dust from the air that the transformer “breathes” in as it cools and heats.
The silica gel, contained in a transparent tube, is highly absorbent, pulling moisture from the incoming air to keep it dry, which is essential for preventing moisture-related issues within the transformer.
The silica gel changes color based on its saturation level, from deep blue (dry) to light blue, and eventually to pink (saturated). This color change indicates when the gel needs to be dried and reused. Additionally, an oil cup at the base of the breather helps capture dust particles from the air. This dual-action filtration keeps the air entering the transformer clean and dry, which is critical for safe and efficient operation
Benefits of Using Silica Gel in Transformer Breathers
- Moisture Control: Prevents transformer oil from absorbing water.
- Increased Efficiency: Helps maintain the transformer’s performance.
- Enhanced Durability: Reduces the risk of internal damage due to moisture.
- Visual Indication: Provides a clear signal for maintenance.
Types of Silica Gel Used in Transformers
Blue vs. Orange Silica Gel
Blue silica gel contains cobalt chloride, which changes from blue to pink when it absorbs moisture, while orange silica gel is cobalt-free, changing from orange to green. Orange gel is often preferred in sensitive environments due to its lack of heavy metals.
Maintenance and Replacement of Silica Gel
Over time, silica gel loses its moisture-absorbing ability and requires regular maintenance. Checking the gel’s color is the easiest way to gauge when it’s time to replace or regenerate it.
Risks of Not Using Silica Gel in Transformer Breathers
Without silica gel, moisture can accumulate in the transformer oil, reducing insulation and leading to internal corrosion. Over time, this may lead to electrical faults, efficiency loss, and even potential failure of the transformer.
FAQ,s Use of silica gel in transformer breather
How often should silica gel be replaced in transformer breathers?
It depends on the humidity level and load on the transformer. Generally, it’s checked monthly, and replacement is done when the gel changes color.
Can silica gel be reused after it’s saturated?
Yes, silica gel can be regenerated by heating it at around 120°C until it returns to its original color, indicating dryness.
Why does silica gel change color in transformer breathers?
The color change indicates saturation. Blue to pink or orange to green shows that it’s absorbed moisture and requires replacement or regeneration.
Is it safe to use silica gel containing cobalt chloride in transformers?
Cobalt chloride (blue gel) is effective but potentially toxic. Orange silica gel is a safer, eco-friendly option without heavy metals.
What happens if I ignore saturated silica gel in the breather?
Saturated gel won’t absorb moisture, allowing it to enter the transformer. This can lead to oil contamination and possible damage to the transformer.
