Misleading line frequency insulation results on a contaminated transformer
CASE STUDY
A 1978 vintage, 20 MVA, 69/13.09 kV, Dyn1 transformer, operating for a major North American utility, was taken out of service to repair a pump in the cooling system. The technical maintenance team completed the required repairs and conducted a complete protocol of routine commissioning tests, including a 10 kV line frequency (LF) power factor (PF) test.
A Guide to Low Resistance Testing
In the modern age of electronics, increased demands are placed on all aspects of electrical circuitry. These types of measurements require the unique characteristics of a low resistance ohmmeter’s four-wire test method.
The use of a DLRO (Digital Low Resistance Ohmmeter) versus a DMM (Digital Multi-Meter)
Application Note
In this note we’ll look at some of these applications and the resulting requirements that highlight the differences between a low resistance ohmmeter (DLRO) and a digital multi-meter (DMM) – and the importance of using a DLRO to find issues that a DMM cannot.
The use of a DLRO (Digital Low Resistance Ohmmeter) versus a DMM (Digital Multi-Meter)
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