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VIII
Sid.
I. Elvärme..........................................................................................................................................141
K. Apparater för elektrisk uppvärmning och kokning..............................................................143
L. Elektriska ångpannor..................................................................................150
M. Elektriska industriugnar..............................................................................................................152
N. Elektrisk svetsning........................................................................................................................154
KAP. 7. TRANSFORMATORER
A. Transformeringsprincipen..............................................................................................................157
B. Transformatorn i tomgång..........................................................................................................158
C. Transformatorn vid belastning. Amperevarvdiagram............................................................161
D. Transformatorns spänningsfall och fullständiga vektordiagram..........................................163
E. Transformatorns förluster och verkningsgrad..........................................................................168
F. Trefas transformatorn....................................................................................................................171
G. Koppling av trefastransformatorer............................................................................................172
H. Parallellkoppling av trefastransformatorer..............................................................................175
I. Sparkopplad transformator..........................................................................................................182
K. Tillsatstransformator....................................................................................................................184
L. Transformatorer med reglerbar omsättning............................................................................185
M. Reglertransformatorer............................................................................................189
1. Sparkopplad reglertransformator..........................................................................................189
2. Regleraggregat, bestående av serietransformator och reglertransformator..................190
N. Tomgångsströmmens övertoner. Transformatorer med utjämningslindning......................191
O. Krafttransformatorns konstruktion............................................................................................197
1. Kärntransformatorer och manteltransformatorer..............................................................197
2. Kärna.................................................................................................................................200
3. Lindning........................................................................................................204
4. Oljelåda och kylanordningar..................................................................................................216
5. Genomföringar..........................................................................................................................226
P. Lindningskopplare..........................................................................................................................229
Q. Temperaturövervakning................................................................................................................242
R. Normer............................................................................................................................................244
1. Överström och kortslutning..................................................................................................244
2. Provspänning............................................................................................................................244
3. Standard märkspännftigar......................................................................................................245
S. Olja..................................................................................................................................................245
1. Oljans egenskaper och framställning....................................................................................245
2. Oljans förorening och åldring................................................................................................246
3. Provning av olja......................................................................................................................247
4. Rening av olja..........................................................................................................................249
T. Driftsättning..................................................................................................................................251
1. Transport....................................................................................................................................251
2. Torkning....................................................................................................................................251
U. Tillsyn och revision......................................................................................................................254
KAP. 8. MÄTTRANSFORMATORER
A. Mättransformatorernas allmänna ändamål..............................................................................257
B. Spänningstransformatorer............................................................................................................259
1. Princip. Vektordiagram........................................................................................................259
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