A generator has been exposed to water and needs to be checked before it can be operated safely. After performing the necessary procedures for drying the generator, what test needs to be performed before safe operation can resume?
• Insulation resistance testing on electrical equipment after drying • Purpose of a megger versus a growler • Why moisture affects insulation more than it affects metal parts
• Think about what part of a generator is most affected by water exposure: the copper windings, the iron core, or the insulation around them? • Which instrument is specifically designed to test the condition of insulation at a high DC voltage? • Which of the choices is a normal final safety check before re-energizing dried electrical machinery?
• Identify which device measures insulation resistance, not just shorts in the windings • Confirm which tool is commonly used on armatures only, and whether that fits this question • Ask: which test result would tell you if the generator’s windings are safely insulated from ground and from each other before operation?
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