Both tan δ and partial discharge testing react to the same underlying defect — voids in stator ground-wall insulation that discharge under voltage. So it is easy to assume they are two ways of doing one job, and to pick whichever your lab already owns. They are not interchangeable. They answer two different questions, and the difference decides… Read More: Tan Delta vs Partial Discharge Testing: Which to Use »
Before IEC 60034-27-3, dissipation factor limits for stator insulation were mostly private — each manufacturer and utility worked to its own internal numbers. The standard put a public set on the table. That was useful, and it was immediately controversial, because a single set of numbers has to cover insulation systems that behave quite differently. So the limits… Read More: IEC 60034-27-3 Limits: tan δ Acceptance Criteria »
A generator failure during an emergency is the worst possible time for a generator to fail. Data centers, hospitals, water treatment plants, and utility backup systems all depend on generators that sit idle for months and then must start and carry full load within seconds. Whether they do depends largely on the condition of their insulation — and… Read More: Generator Insulation Testing: A Field Engineer’s Guide »