IEEE C57.12.12 : 1980
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
GUIDE FOR INSTALLATION OF OIL-IMMERSED EHV TRANSFORMERS 345 KV AND ABOVE.
Hardcopy , PDF
07-23-2013
English
01-01-1980
1 Introduction
2 Inspection on receipt
2.1 External, transformer on rail car
2.2 Internal, transformer on rail car
3 Internal inspection at site
4 Preliminary oil filling
5 Assembly
6 Vacuum treatment and final filling
7 Vacuum drying of insulation
8 Recirculation
9 Energization
10 References
Appendices
A EHV transformer installation
B Field equipment for oil filling EHV transformers
C Determination of insulation dryness
D Mineral oil for use in EHV transformers
Figures
B1 Insulation temperature bridge
C1 Conversion of dewpoint or frostpoint to vapor
pressure in micrometers (or Pascals)
C2 Moisture equilibrium chart with moisture content in
percent of dry weight of insulation
C3 Some examples of insulation characteristics
Table
D1 Characteristics of mineral oil suitable for use in
EHV transformers
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