Table 2A. - Limiting observable temperature rise of indirectly cooled and directly water-cooled salient pole
synchronous generators and synchronous generator/motors for hydraulic turbine applications - indirectly
cooled machines manufactured before 1982
synchronous generators and synchronous generator/motors for hydraulic turbine applications - indirectly
cooled machines manufactured before 1982
Method of Temperature rise(°C)
Item
Machine part Temperature Class B Class F
determination
(1) Armature windings of machines 1500 kV
s
A
RTD
60
80
and above.
(2) Field windings of machines 1500 kV
s
A and
Resistance.
80
100
above.
(3) Collector rings
Thermometer.
65
85
(4) Cores and mechanical parts in contact with
Thermometer. 55 75
or adjacent to insulation (except (except
motors) motors)
motors) motors)
70 90
(motors) (motors)
(5) Miscellaneous parts such as brushholders, May attain such temperature as will not
brushes, etc.
injure the machine in any respect.
Table 2B. - Limiting observable temperature rise of indirectly cooled and directly water-cooled salient pole
synchronous generators and synchronous generator/motors for hydraulic turbine applications - indirectly
cooled machines manufactured after 1982
synchronous generators and synchronous generator/motors for hydraulic turbine applications - indirectly
cooled machines manufactured after 1982
Method of
Temperature rise (°C)
Item Machine part Temperature Class B Class F
determination
(1) Armature winding1
+
(a) 7000 V and less Embedded detector.*
80 100
(b) over 7000 V to 15 000 V Embedded detector.* 75 90
inclusive.
(c) over 15 000 V Embedded detector.* 70 85
(2) Field winding. Resistance. 80 100
(3) Collector rings. Thermometer.
(2) Field winding. Resistance. 80 100
(3) Collector rings. Thermometer.
85 85
(4) Cores and mechanical parts in contact Thermometer Not to exceed the value
with or adjacent to insulation or detector, for the associated
with or adjacent to insulation or detector, for the associated
adjacent insulation.**
(5) Miscellaneous parts (such as amortisseur windings, brush holders, brushes, etc.) may attain
such temperatures as will not injure the machine in any respect.
*
Embedded detectors are located within the slot of the machine and can be either resistance elements or
thermocouples.
thermocouples.
+ The temperature rise limits listed are for insulation system with thermosetting materials. For thermoplastic
materials, the
temperature rise limit shell be 70 °C.
** When core temperatures are measured at the outside diameter of the core, the limiting temperature rise shall
materials, the
temperature rise limit shell be 70 °C.
** When core temperatures are measured at the outside diameter of the core, the limiting temperature rise shall
be 5 °C less than the associated armature winding insulation limiting temperature rise.
(FIST 1-4 3/91)
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