Passage:
Large power transformers rely on insulating oil to dissipate heat and prevent electrical arcing within internal windings. As ambient temperatures fluctuate and electrical loads change, the oil volume expands and contracts, forcing air in and out of the transformer's expansion tank through a desiccant breather. Maintenance crews monitor the color of the silica gel inside the breather, replacing the pellets as soon as they transition from deep cobalt blue to pale pink. If moisture-laden air bypasses saturated desiccant, water vapor condenses directly onto the internal oil supply, sharply reducing the oil's dielectric breakdown voltage.
Based on the passage, the replacement of pink silica gel pellets implies that:
- AThe transformer's internal windings have overheated and suffered structural damage
- BThe insulating oil volume has expanded past the physical capacity of the expansion tank
- The desiccant material has absorbed moisture to its limit and can no longer filter incoming air effectivelyCevap
- DThe dielectric breakdown voltage of the insulating oil has dropped below legal operating standards
Cevap
The desiccant material has absorbed moisture to its limit and can no longer filter incoming air effectively.
The passage states that crews replace the silica gel as soon as it turns from blue to pink and immediately warns of the risk if moisture passes through 'saturated desiccant.' Logically connecting the replacement trigger to the risk of saturation reveals that the pink color implies the desiccant is fully saturated and unable to absorb further moisture.
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Anahtar Kavram
Inferring unstated technical conditions from contextual clues and procedural triggers
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