7-8
TABLE 7-1. GENERATOR STATOR AND ROTOR WINDING RESISTANCES
REFERENCE
LENGTH
MILLIMETERS
(INCHES)
1
MAIN
WINDING
RESISTANCE
OHMS
2,
3
QUADRATURE
WINDING
RESISTANCE
OHMS
2
MAIN ROTOR
WINDING RE-
SISTANCE
OHMS
2
EXCITER ROTOR
WINDING RE-
SISTANCE
OHMS
2
EXCITER STATOR
WINDING RE-
SISTANCE
OHMS
2
4-Lead Generators (Single-Phase)
341 (13.4) 0.179−0.197 1.716−1.864 2.54−3.10 0.58−0.71 13−16
378 (14.9) 0.097−0.108 1.010−1.110 2.17−2.65 0.58−0.71 13−16
376 (14.8) 0.078−0.086 0.807−0.897 2.12−2.59 0.58−0.71 13−16
412 (16.2) TBD 0.658−0.728 1.89−2.32 0.58−0.71 13−16
485 (19.1) TBD 0.506−0.560 2.20−2.68 0.58−0.71 13−16
489 (19.3) TBD 0.506−0.560 2.32−2.56 0.58−0.71 13−16
534 (21.0) 0.024−0.026 0.483−0.533 2.77−3.06 0.58−0.71 13−16
12-Lead Generators (Three-Phase)
341 (13.4) 0.36−0.44 2.961−3.219 2.54−3.10 0.58−0.71 13−16
378 (14.9) 0.15−0.19 2.356−2.593 2.17−2.65 0.58−0.71 13−16
412 (16.2) 0.105−0.117 1.852−2.047 1.89−2.32 0.58−0.71 13−16
485 (19.1) 0.056−0.062 1.605−1.774 2.20−2.68 0.58−0.71 13−16
489 (19.3) 0.056−0.062 TBD 2.32−2.56 0.58−0.71 13−16
526 (20.7) TBD TBD 2.77−3.06 0.58−0.71 13−16
REFERENCE LENGTH
1. Measure this length to identify the generator.
2. If high, recheck winding resistance after the windings have cooled to room temperature.
3. The main windings are probably good if some of the resistances fall outside the range but are all within 10 percent of each other.
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