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Diagnostic tests such as insulation resistance, polarization index, dissipation factor, capacitance and partial discharge can be useful to diagnose the condition of the stator winding insulation, and identify many problems that could lead to insulation failure. Many years of experience, however, has shown these quantities by themselves cannot predict the remaining life of a winding. However, asset...
Over-potential or hipot tests have been applied for many decades to rotating machine windings to assure that the electrical insulation in windings is fit for service. Hipot tests are used universally as acceptance tests for new windings. However, a rotating machine maintenance engineer often faces plant managers reluctant to approve hipot tests. The managers ask, `Do hipot tests damage rotating machine...
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