| 摘要 |
The internal fault indicator includes an open ended housing mounted in an opening in the wall of a transformer casing. An indicator lens is attached over a first open end of the housing and a diaphragm is attached over a second open end of the housing with the second end of the housing being positioned so that the diaphragm is subjected to internal pressure surges within the transformer. The diaphragm carries a trigger retainer which engages a trigger on an indicator shaft mounted for rotation within the housing. An indicator is mounted on the indicator shaft beneath the lens, and a bias spring is connected to the indicator shaft to bias the shaft toward rotation relative to the housing when the trigger is engaged with the trigger retainer. When the diaphragm moves in response to a pressure surge in the transformer, the trigger retainer moves away to release the trigger, and the bias spring rotates the indicator shaft and indicator so that a warning section on the indicator is positioned for viewing through the lens.
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