Partial discharge testing with the Baker DX

Testing large stator with Baker DX

Partial discharge (PD) is a phenomenon associated with voids, cracks or breakdowns in an electric motor's winding, or turn-to-turn insulation.

The PD test is an optional feature of the Baker DX series of SKF static motor analyzers. It was conceived out of documented demand from motor repair and service shop personnel for a test that could capture and analyze evidence of partial voltage discharges that occurred when surge tests are performed. When the typically high, short-term voltages required of surge tests are applied to a motor (as they are by SKF static motor analyzers), partial discharge can be detected and its behavior analyzed. Such PD can be indicative of early motor winding insulation weaknesses or production faults—faults that often accelerate degradation of the insulation. Such premature insulation degradation can reduce the expected service life of a motor. If left undetected or unmonitored, such weaknesses can result in costly unplanned downtime of the production equipment and replacement of the motor.

SKF's Baker DX Surge PD static motor analyzer offers the industry's most accurate detection and analysis of partial discharge. Motor repair/service shops, industrial motor maintenance (PdM) professionals, and motor OEMs all benefit from detection of early motor insulation weakness in order to effectively manage and maximize the service life of a give motor. It is a seamless test performed in conjunction with a surge test on the Baker DX. It employs SKF intellectual property to capture credible evidence of probable weaknesses in motor insulation that would be prone to accelerated degradation. Unlike other products on the market that use radio-frequency PD monitoring (and antennae to capture RF signals), the Baker DX Surge PD analyzer employs an innovative resistive measurement method that is not only more accurate than RF, it does not rely on crude placements or positioning of a clunky antenna to capture PD indices.

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