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 »
For a century, insulation testing meant sending a technician out with a megohmmeter every so often to take a reading. That model is being replaced, piece by piece, with continuous online monitoring — sensors left permanently on the asset, watching insulation condition in real time and raising an alarm when it drifts. The shift is furthest along where… Read More: Online Insulation Monitoring: The Shift From Periodic Tests »
You’ve decided your equipment needs partial discharge testing. The next question is operational: do you take the equipment out of service for offline measurement, or install sensors and monitor while it operates? The answer drives equipment selection, budget, outage planning, and the diagnostic value you’ll get. This article compares offline and online PD testing in detail — how… Read More: Online vs Offline Partial Discharge Testing: Which Method, When, and… »
A single insulation reading tells you the condition today. A thousand readings over a decade tell you when the equipment is going to fail. That’s the difference between preventive maintenance and predictive maintenance. Preventive says “test every 6 months.” Predictive says “this motor’s PI has dropped from 3.2 to 2.4 over the last four tests. At this rate… Read More: Predictive Maintenance with Insulation Testing: Building a Data-Driven Program »