Electrical utility transformers that use oil as an insulating barrier between the high and low voltage wire windings often fail because moisture and explosive gases build up in the oil, forming a pathway for a sudden, dangerous electric arc between the windings. Larson-Davis Inc of Provo, Utah, us , have developed an early warning package that is placed inside the transformer. It includes a vibration sensor that predicts mechanical failure from change in the transformer's hum and Cross Check, a sensor developed in conjunction with scientists from Birmingham Young University, Utah, us , which monitors the oil's effectiveness as an insulator by detecting changes in an extremely low frequency electrical signal that is sent through the oil.
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