Insulation resistance measurement in static leonard apparatus

Details Insulation resistance measurement in static leonard apparatus Insulation resistance measurement in static leonard apparatus

1984-10-03

1985-12-31

Shoop, Jr., William M.

Electricity: motive power systems

With signals, meters, recorders or testing devices

324 54, 340647, G01R 3102

Patent

active

045623902

ABSTRACT:
In a static leonard apparatus, a DC motor is supplied from a thyristor converter through a main circuit switch, and a capacitor is connected between the DC output buses of the thyristor converter. When the main circuit switch is turned off, a grounding switch is turned on to ground one of the DC output buses to form a grounded closed discharge circuit including the DC motor through which the capacitor discharges. During the turned-off period of the main circuit switch, the capacitor is charged with the output voltage of the thyristor converter. The capacitor discharges through the grounded closed discharge circuit. The voltage values of the discharging capacitor at two points on the time axis are detected to compute the discharge time constant of the capacitor, and, on the basis of the computed discharge time constant, the insulation resistance of the DC motor is measured.

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