What is used to alleviate the potential of accidents due to pressure in transformers?

• A. Valve
• B. Vent
• C. Relay
• D. Gauge

Answer: (A)

When a transformer experiences overheating or faulting, gases and oil can expand and pressure inside the tank can rise rapidly. If this overpressure isn’t controlled, the tank could fail catastrophically. A valve, specifically a pressure-relief valve, provides a controlled safety path to vent the gas and oil when the internal pressure hits a predetermined limit. This automatic relief keeps the pressure at a safe level and prevents accidents.

A vent can release gas, but it often operates without a precise pressure threshold, so it may not keep the pressure within safe bounds. A gauge only measures pressure, not relieve it, and a relay is part of protection logic that may trip equipment but doesn’t directly relieve pressure. So the device best suited to prevent pressure-related accidents is a valve.