The DCR 50 is a simple off-line DC test to identify problems in the stator groundwall insulation system of large AC electric machines before an unexpected in-service failure occurs. Unlike the pass or fail of a DC or AC hi-pot test, the DC ramp test gives diagnostic information and can be stopped before a failure occurs.

Unlike a stepped voltage, the ramped voltage enables the user to separate the polarization and capacitive current components from the leakage current so that small insulation defects can be easily found.

A single-phase test usually takes less than an hour to perform and can be done by one person. The DCR 50 tests according to IEEE Std 95-2002.

The DC Ramp Test method has been proven in use (for almost 40 years) by the US Bureau of Reclamation and others on a wide variety of machines with asphalt, polyester and epoxy-mica insulations.

Test curves are captured on a PC to allow easy comparison to similar machines or past results.

DC Ramp Test Set

Features

• Automatically ramps voltage from 0 to 50kV
• Ground presence detection and protection
• Optional manual voltage control (0-50 kV)
• Automatic trip protection (high/low tracking,  output limit, fault detection)
• Built-in winding discharge circuit
• Analog outputs for voltage and current
• Connection to PC to: display results as test  progresses, store multiple curves and test  parameters for later analysis and display curves side-by-side for test comparison

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