Final answer:
Insulating oil in transformers should be tested for acidity regularly to prevent equipment failure and hazards.
Explanation:
Insulating oil in a liquid-filled transformer should be tested for acidity on a regular basis. High levels of acidity in the oil can indicate degradation of the insulation properties, potentially leading to equipment failure and electrical hazards. Regular testing and monitoring of acidity levels help ensure optimal performance and longevity of the transformer.
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