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VI
KAP. 19. ELEKTRISKA ISOLERMATERIAL OCH ISOLATORER
Sid.
A. Olika isolermaterial och deras egenskaper....................................... 155
B. Den elektriska hållfastheten hos anläggningsdelar och dess utprovning............. 159
C. Märkspänningar, provspänningar och överslagsspänningar. Isolationskoordination.... 168
D. Normer för provning av isolatorer.............................................. 172
E. Isolatorporslin................................................................ 175
F. Linjestödisolatorer............................................................ 176
1. Konstruktiva detaljer....................................................... 176
2. Klassificering.............................................................. 177
3. Standardiserade isolatorer................................................... 178
4. Cylinderisolatorer........................................................... 180
5. Drevning.................................................................. 181
G. Hängisolatorer................................................................ 182
1. Konstruktiva detaljer....................................................... 182
2. Dimensionering och användning............................................. 185
H. Ställverksisolatorer............................................................ 188
1. Inomhusisolatorer.......................................................... 188
2. Utomhusisolatorer.......................................................... 190
I. Genomföringar................................................................ 193
1. Porslinsgenomföringar....................................................... 193
2. Porslinsklädda kondensatorgenomföringar..................................... 194
KAP. 20. LUFTLEDNINGAR
A. Inledning........................................................................................................................................198
B. Allmänna bestämmelser..............................................................................................................200
C. Beräkningsnormer..........................................................................................................................201
1. Fasavstånd och spännvidd....................................................................................................201
2. Uppspänning och nedhängning............................................................................................201
3. Stolphöjd....................................................................................................................................203
D. Ledningstyper................................................................................................................................205
E. Ledare..............................................................................................................................................206
1. Material......................................................................................................................................206
2. Dimensionering........................................................................................................................207
3. Skarvning..................................................................................................................................210
4. Vibrationer................................................................................................................................211
5. Jordlinor....................................................................................................................................211
6. Skruvning..................................................................................................................................212
F. Isolatorer........................................................................................................................................213
1. Stödisolatorer............................................................................................................................213
2. Hängisolatorer..........................................................................................................................216
G. Stolpar............................................................................................................................................219
1. Stolptyper..................................................................................................................................219
2. Material......................................................................................................................................221
3. Dimensionering........................................................................226
4. Stagning....................................................................................................................................228
H. Skyddsanordningar........................................................................................................................230
I. Skogsgator....................................................................................................................................236
K. Koncession, jordägarfrågor och expropriation........................................................................237
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