Page 42 - Offshore Electrical Engineering Manual

Basis of Machine Ratings 29

Water-Cooled Machine Class B E 90 80 90 85 80 75 100 – 90 85 100 90 90 85 90 85 90 80

A B 70 70 70 70 60 60 – 80 70 70 75 80 70 70 The temperature rise of these parts shall in no case reach such a value that there is a risk of injury to any insulating or other material adjacent parts 70 70 70 70

Air-Cooled Machine Class E 60 65 55 – 65 70 65 65 60
Table 2.1.1 Limits of Temperature Rise in Degree Celsius for Rotating Machines

A 50 50 40 – 50 55 50 50 50

Temperature Measurement Method ETD or R R T R T, R T, R T T – T T ETD, embedded temperature detector; R, resistance method; T, thermometer method.

Part of Machine AC windings of turbine-type machines having output of 5000 kV a or more AC windings of salient-pole and of induction machines having output of 5000 kV a or more AC windings of machines smaller than in item 1 Field windings of a.c. and d.c. machines having d.c. excitation other than those in items 3 and 4 Windings of armatures having commutators Field windings of turbine- typ

Item 1(a) 1(b) 2(a) 2(b) 2(c) 3 4(a) 4(b) 5 6 7 8 9