How is transformer oil pressure monitored and controlled?

Transformer oil pressure is monitored using pressure gauges, sudden pressure relays, and pressure relief devices depending on transformer design. Conservator type transformers manage pressure through oil expansion into the conservator, while sealed units use diaphragms or nitrogen cushions. Control involves maintaining correct oil level, ensuring breathers function properly, and preventing excessive gas accumulation. Abnormal pressure trends can indicate overheating, gas generation from internal faults, blocked vents, or conservator problems.