• Robert Dansertlaan 250, 1702 Groot-Bijgaarden, Belgium

Ceramic Transformator bushings

Transformator bushings

Ceramic / porcelain material

Ceramic groupCeramic groupCeramic groupCeramic group
Sub-GroupC-110C-120C-130C-221
Silicious
Porcelain
Aluminous porcelain
Standard strength
Aluminous porcelain
High strength
Steatite low/loss
angle
PropertiesPropertiesPropertiesSymbolsUnitsAL2O3
<30%
AL2O3
30-50%
AL2O3
>50%
Apparent prosity (open)max.max.PaVolume %0.00.00.00.0
Bulk densitymin.min.δag/cm32,22,32,52,7
Flexural strengthmin.unglazedRfN/mm25090140140
min.glazedRfN/mm260110160-
Modulus of elasticityminEGPa6070100100
Mean coefficient linear expansionα 20-100°C10-6K-13-63-64-76-8
α 20-300°C10-6K-13-63-65-77-9
α 20-600°C10-6K-14-75-75-78-9
Specific heat capacity20°-100°CcpJ/kgK750÷900750÷900750÷900790÷920
Thermal conductivity20°-100°CλW/mK1÷2,51,2÷2,61,5÷4,02,3÷2,8
Resistance to thermal shockmin.ΔtK150150150100
Electric strengthmin.EdkV/mm20202020
Withstand voltagemin.UkV30303030
Relative permittivity48÷62 Hzεr6÷76÷76÷7,56
Dissipational 20°Cmax.48÷62 Hztanδ10-32525301,5
max.1 kHztanδ10-3----
max.1 MHztanδ10-31212151,2
Volume resistivity in terms of temperaturemin.20°CρvΩcm1013101310131012
min.200°CρvΩcm1081081081011
min.600°CρvΩcm104104104107
Temperature corresponding to a volume resistivitymin.100 MΩcmtK100°C200200200500
min.1 MΩcmtK1°C350350350800
For post insulators, hot-dip galvanized cast iron flanges assembled or with :
Sulphur cement = excellent mechanical performances and max use temperature 90°C - Reduced assembly time
Portland cement = max use temperature 200°C - Drying time in mould is longer

Ceramic transformator bushing 12/24 kV - 250A - acc to DIN42531

Ceramic transformer bushings - DIN42531 - 250 A

typeFig.1234HCrAd1d2d3d4d5d6nmkh1h2h3Weight
kVkVkVkVmmmmmmmmmmmmmmmmmmmmmmmmmmmmkg
10Ni250A12304060245180250423311174100321522-6525352,6
10Nf250B12354575295290250423311174140321522-6525353,5
20Nf250B245575125385445250423311174155321522-8025355,1
30Nf250B367595170485600250423311174155321522-8025356,5
1 - Rated Highest voltage for equipment (Um)
2 - Rated Power Frequency Withstand Voltage, wet (50 Hz, 1 min)
3 - Rated Power Frequency Withstand Voltage, dry (50 Hz, 1 min)
4 - Rated Lightning impulse withstand, dry (1.2/50 μs)
Cr - Minimum creepage length
A - Rated Current

ceramic Terminal motor bushing 12/24 kV - 630A - acc to DIN42532

Ceramic transformer bushings - DIN42532 - 630 A

typeFig.1234HCrAd1d2d3d4d5d6nmkh1h2h3Weight
kVkVkVkVmmmmmmmmmmmmmmmmmmmmmmmmmmmmkg
10Ni630A123040602451906305039128881104024,530,5-6525353,2
10Nf630B123545752952956305039128881504024,530,5-6525354,3
20Nf630B2455751253854456305039128881654024,530,5-8025356,6
30Nf630B3675951705106456305039128881804024,530,5-10025358,5
1 - Rated Highest voltage for equipment (Um)
2 - Rated Power Frequency Withstand Voltage, wet (50 Hz, 1 min)
3 - Rated Power Frequency Withstand Voltage, dry (50 Hz, 1 min)
4 - Rated Lightning impulse withstand, dry (1.2/50 μs)
Cr - Minimum creepage length
A - Rated Current

ceramic Terminal motor bushing 12/24/36 kV - 1000A - 3150A - acc to DIN42533

Ceramic transformer bushings - DIN42533 - 1000A - 3150A

typeFig.1234HCrAd1d2d3d4d5d6nmkh1h2h3Weight
kVkVkVkVmmmmmmmmmmmmmmmmmmmmmmmmmmmmkg
10Nf1000C1235457532530010008058163108170-3246129030407
20Nf1000C24557512541045010008058163108185-32461210030408,5
30Nf1000C36759517054064510008058163108200-324612125304011,0
10Nf3150C12354575325300315010074183131190-5162179030408,5
20Nf3150C245575125410450315010074183131210-516217100304010,0
30Nf3150C367595170540680315010074183131230-516217125304014,0
1 - Rated Highest voltage for equipment (Um)
2 - Rated Power Frequency Withstand Voltage, wet (50 Hz, 1 min)
3 - Rated Power Frequency Withstand Voltage, dry (50 Hz, 1 min)
4 - Rated Lightning impulse withstand, dry (1.2/50 μs)
Cr - Minimum creepage length
A - Rated Current