The PD testing of rotating machines is also used when inspecting the quality of new assembled and finished stator windings, new winding components and fully impregnated stators. the measurement of dissipation factor or insulation resistance) the differentiating character of partial discharge measurements allows localized weak points of the insulation system to be identified. Compared with other dielectric tests (i.e. For many years, the measurement of partial discharges (PD) has been employed as a sensitive means of assessing the quality of new insulation as well as a means of detecting localized sources of PD in used electrical winding insulation arising from operational stresses in service.IEEE Std 43-2000IEEE Recommended Practice for Testing Insulation Resistance of Rotating Machinery This test is non- destructive providing that it does not fail and is usually required by safety agencies to be performed as a 100% production line test on all products before they leave the factory.
The leakage current must be below a preset limit or the test is considered to have failed. A standard test voltage is applied (below the established Breakdown Voltage) and the resulting leakage current is monitored. This test allows designers to estimate the breakdown voltage of a product’s design and to see where the breakdown occurred. The dielectric is often destroyed by this test so this test is used on a random sample basis. The test voltage is increased until the dielectric fails, or breaks down, allowing too much current to flow. Usually, lower the insulation resistance, it is more likely that there is a problem with the insulation. Ideally, this resistance should be infinite. Insulation Resistance test measures the resistance of the electrical insulation between the copper conductors and the core of the stator.These three tests differ in the amount of voltage applied and the amount (or nature) of acceptable current flow: Three types of High Potential Test tests are commonly used.Slot Fill and Design for Manufacturability Confirmation.Technical Requirements for Electrical Machines.
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