7-7
Main Stator
Main Winding Insulation Resistance: Test each
winding separately. Disconnect the winding lead
from its grounded neutral connection and isolate it.
Leave the other windings grounded. Connect either
or both winding leads to the megger and conduct the
test as instructed under Winding Insulation Resist-
ance Test Procedure.
Main Winding Resistance: Disconnect all main
stator leads from the terminals to which they are
connected.
For 4-Lead generators measure resistance across
lead pairs:
T1—T2, T3—T4
For 12-Lead generators measure resistance
across lead pairs:
T1—T4, T2—T5, T3—T6, T7—T10, T8—T11,
T9—T12
Replace the stator assembly if the resistance of any
winding is not as specified in Table 7-1.
Quadrature Winding Insulation Resistance: Dis-
connect genset control connector P3. Connect pin
P3-4 or P3-5 to the megger and conduct the test as
instructed under Winding Insulation Resistance
Test Procedure.
Quadrature Winding Resistance: Measure wind-
ing resistance between pins P3-4 and P3-5 with a
Wheatstone bridge. Replace the stator assembly if
the resistance is not as specified in Table 7-1.
Winding-to-Winding Insulation Resistance: Dis-
connect genset control connector P3 and all main
stator leads from the terminals to which they are
connected. Check stator winding-to-winding insula-
tion resistance between the following lead pairs as
instructed under Testing Winding Insulation Resist-
ance:
For 4-Lead generators measure insulation resist-
ance between lead pairs:
T1—T3, T1—P3-4, T3—P3-4
For 12-Lead generators measure insulation resist-
ance between lead pairs:
T1—T2, T1—T3, T1—T7, T1—T8, T1—T9,
T2—T3, T2—T7, T2—T8, T2—T9, T3—T7,
T3—T8, T3—T9, T7—T8, T7—T9, T8—T9,
T1—P3-4, T2—P3-4, T3—P3-4, T7—P3-4,
T8—P3-4, T9—P3-4
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