Temperature Management of Synchronous Generators

After the generator set is started and runs at full load for about 4-6 hours, if the temperature rise of the generator exceeds the specified value, various faults are prone to occur. Today, Dingbo Power will introduce to you the technical parameters of the maximum allowable temperature rise of synchronous generators under different insulation levels, as well as the hazards and travel reasons of excessive temperature of synchronous generators. The specific details are as follows:

The impact and causes of high temperature in synchronous generators:

The output power of a synchronous generator mainly depends on the maximum allowable temperature and temperature rise of the main components of the generator, such as windings, iron cores, and bearings. Under full load conditions, if the temperature or temperature rise of a synchronous generator exceeds the specified value after continuous operation for 4-6 hours, it must be inspected. Otherwise, it will accelerate the aging of the generator insulation, shorten its service life, and even damage the synchronous generator. There are two reasons for the high temperature or temperature rise of synchronous generators during operation.

There are two reasons for the high temperature of the generator. On the one hand, it is due to electrical reasons. On the other hand, it is due to mechanical reasons.

Insulation and temperature limits for synchronous generators

1. Maximum allowable temperature rise of stator winding

A-level insulation: thermometer method 55; Resistance method 60°

E-class insulation: thermometer method 65°; Resistance method 75°

B-class insulation: thermometer method 70°; Resistance method 80°

F-class insulation: thermometer method 85°; Resistance method 100°

H-level insulation: thermometer method 105°; Resistance method 125°

2. Maximum allowable temperature of rotor winding (under different insulation levels)

A-level insulation: thermometer method 55; Resistance method 60°

E-class insulation: thermometer method 65°; Resistance method 75°

B-class insulation: thermometer method 70°; Resistance method 80°

F-class insulation: thermometer method 85°; Resistance method 100°

H-level insulation: thermometer method 105°; Resistance method 125°

3. Maximum allowable temperature of motor iron core (under different insulation levels)

A-level insulation: thermometer method 60°;

E-class insulation: thermometer method at 75℃;

B-class insulation: thermometer method 80°;

F-class insulation: thermometer method 100°;

H-level insulation: thermometer method 125°.

4. Maximum allowable temperature of sliding bearings (under different insulation levels)

A-level insulation: thermometer method 40°;

E-class insulation: thermometer method at 40℃;

B-class insulation: thermometer method 40°;

F-class insulation: thermometer method at 40℃;

H-level insulation: thermometer method 40°;

5. Maximum allowable temperature of rolling bearings

A-level insulation: thermometer method 55°;

E-class insulation: thermometer method at 55℃;

B-class insulation: thermometer method 55°;

F-class insulation: thermometer method 55°;

H-level insulation: thermometer method 55°;

The maximum allowable temperature of synchronous generators should be consistent with the temperature rise and maximum temperature of stator windings, rotor windings, and motor iron cores at different insulation levels, which will increase with the insulation level. The temperature rise of sliding bearings and rolling bearings is not allowed to exceed 40℃ and 55℃. Therefore, if it exceeds the standard during measurement, it indicates a fault.

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