IEC 60354:1991
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Loading guide for oil-immersed power transformers
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
12-15-2005
English - French, English, French
10-15-1991
FOREWORD
Section 1. General
1.1 Scope
1.2 Object
1.3 Definitions
1.4 General limitations and effects of loading
beyond nameplate rating
1.5 Specific limitations for distribution transformers
1.6 Specific limitations for medium power transformers
1.7 Specific limitations for large power transformers
Section 2. Determination of temperatures
2.1 Symbols
2.2 Direct measurement of hot-spot temperature
2.3 Assumed thermal characteristics
2.4 Steady-state temperature equations
2.5 Transient temperature equations
2.6 Thermal ageing of transformer insulation
2.7 Ambient temperature
2.8 Computer program
Section 3. Loading tables
3.1 Limitations applicable to loading tables
3.2 Method of representing an actual load cycle by an
equivalent two-step rectangular load cycle
3.3 Normal continuous loading
3.4 Normal cyclic loading
3.5 Emergency cyclic loading
Annexes
A Equivalent rating for auto-transformers
B Alternative method for determining the winding
oil average temperature rise
C Information to be supplied with enquiry and order
D Calculation of parameters for sinusoidal variation
of ambient temperature
E Example of simplified application of the guide
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