Motor
Off-line Testing

DC Ramp Test Set -- Model DCR-50™
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The DCR-50 instrument provides a safer off-line test of stator winding insulation compared to a DC or AC hipot test. It can identify problems in the stator winding insulation before an unexpected in-service failure, unlike the pass/fail of a dc or ac hipot test.

DC Ramp Test Set -- Model DCR-50 Features
  • Ground Presence Detection and Protection
  • Automatic Ramp or Manual Mode
  • Ramp Rate Control (0-2.5 kV/min)
  • Manual Voltage Control (0-50 kV)
  • Automatic Trip Protection (high/low tracking, output limit, fault detection)
  • Built-in Winding Discharge Circuit
  • Voltage Metering (0-50 kV)
  • Current Metering (0-250 µA, range switchable, charge and discharge)
  • Analog and Digital Outputs for Voltage and Current
  • Connection to a PC

An automatically ramped or manually stepped direct voltage (up to 50 kV) is applied to the stator winding and the resulting current is measured and plotted against voltage. Examination of the current versus voltage curve allows assessment of stator insulation condition, as well as diagnosis of damage, defects, and deterioration mechanisms. The DCR-50 allows tests to be performed in accordance with IEEE Std 95-2002.

The test results are repeatable and accurate. This test can frequently identify stator insulation windings that are approaching failure, without accelerating the deterioration process. It can take less than an hour to perform. The DC Ramp Test method has been proven for motor and generator insulation testing for many years by the US Bureau of Reclamation and others. It is applicable to asphalt, polyester and epoxy-mica insulation systems.