• Robert Dansertlaan 250, 1702 Groot-Bijgaarden, Belgium

Ceramic LV bushings

Ceramic LV bushings

Ceramic LV bushings – catalogue file
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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 low voltage bushings

Ceramic low voltage bushings

Ceramic low voltage bushings

Ref.123H1H2H3H4D1D2D3Weight
kVkVkVmmmmmmmmmmmmmmkg
BAR363/331,2745109,57,512,56,5M30,010
BAR363/431,2745109,57,512,56,5M40,012
BAR364/531,57801515102011M50,033
BAR364/631,57901515102011M60,045
BAR3511,51,53,510038873016M80,12
BAR35241,5121504612163925M120,32
1 - Nominal Voltage (Un) - 50 Hz
2 - Nominal Voltage (Un) - 20 MHz
3 - Rated Power Frequency Withstand Voltage, dry (50 Hz, 1 min)
H - Height insulating part
H2 - Usable Height support
H3 - Height with 1 male rod