Keramische steunisolatoren voor hoge temperatuur

Keramische steunisolatoren voor hoge temperatuur

Keramische steunisolatoren voor hoge temperatuur – documentatie pagina

Ceramic / porcelain material

					Ceramic group	Ceramic group	Ceramic group	Ceramic group
				Sub-Group	C-110	C-120	C-130	C-221
					Silicious Porcelain	Aluminous porcelain Standard strength	Aluminous porcelain High strength	Steatite low/loss angle
Properties	Properties	Properties	Symbols	Units	AL2O3 <30%	AL2O3 30-50%	AL2O3 >50%
Apparent prosity (open)	max.	max.	Pa	Volume %	0.0	0.0	0.0	0.0
Bulk density	min.	min.	δa	g/cm3	2,2	2,3	2,5	2,7
Flexural strength	min.	unglazed	Rf	N/mm2	50	90	140	140
	min.	glazed	Rf	N/mm2	60	110	160	-
Modulus of elasticity		min	E	GPa	60	70	100	100
Mean coefficient linear expansion			α 20-100°C	10-6K-1	3-6	3-6	4-7	6-8
			α 20-300°C	10-6K-1	3-6	3-6	5-7	7-9
			α 20-600°C	10-6K-1	4-7	5-7	5-7	8-9
Specific heat capacity		20°-100°C	cp	J/kgK	750÷900	750÷900	750÷900	790÷920
Thermal conductivity		20°-100°C	λ	W/mK	1÷2,5	1,2÷2,6	1,5÷4,0	2,3÷2,8
Resistance to thermal shock		min.	Δt	K	150	150	150	100
Electric strength		min.	Ed	kV/mm	20	20	20	20
Withstand voltage		min.	U	kV	30	30	30	30
Relative permittivity		48÷62 Hz	εr		6÷7	6÷7	6÷7,5	6
Dissipational 20°C	max.	48÷62 Hz	tanδ	10-3	25	25	30	1,5
	max.	1 kHz	tanδ	10-3	-	-	-	-
	max.	1 MHz	tanδ	10-3	12	12	15	1,2
Volume resistivity in terms of temperature	min.	20°C	ρv	Ωcm	1013	1013	1013	1012
	min.	200°C	ρv	Ωcm	108	108	108	1011
	min.	600°C	ρv	Ωcm	104	104	104	107
Temperature corresponding to a volume resistivity	min.	100 MΩcm	tK100	°C	200	200	200	500
	min.	1 MΩcm	tK1	°C	350	350	350	800

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

Keramische laagspanning steunisolatoren

Ceramic stand off insulator for high temperatures

Ref.	Type	Insertmaterial	1	2	H	Ø	Cr.	ML	N1	N2	N3	N4	TT	Weight
			kV	kV	mm	mm	mm	N	N	Nm	N	N	Nm	gr
BG25-M6	IS312024400	Nickel brass		12	25	28	34	≥ 75	1200	≥ 18	≥ 3000	≥ 5000	6	40
BG35-M6	IS312025200	Nickel brass		17	35	36	65	≥ 150	≥ 1600	≥ 35	≥ 6000	≥ 10000	6	75
BG35-M8	IS312023600	Nickel brass		17	35	36	65	≥ 150	≥ 1600	≥ 35	≥ 6000	≥ 10000	18	75
BG50-M10	IS312022600	Nickel brass		29	50	50	95	≥ 275	≥ 3600	≥ 80	≥ 11000	≥ 20000	32	220
BG50-M12	IS312022800	Nickel brass		29	50	50	95	≥ 275	≥ 3600	≥ 80	≥ 11000	≥ 20000	55	220
BG60-M10	IS312025600	Nickel brass		32	60	60	120	≥ 400	≥ 6000	≥ 140	≥ 16000	≥ 25000	32	460
BG60-M12	IS312020200	Nickel brass		32	60	60	120	≥ 400	≥ 6000	≥ 140	≥ 16000	≥ 25000	55	460
BG60-M14	IS312024600	Nickel brass		32	60	60	120	≥ 400	≥ 6000	≥ 140	≥ 16000	≥ 25000	90	460
BG60-M16	IS312024800	Nickel brass		32	60	60	120	≥ 400	≥ 6000	≥ 140	≥ 16000	≥ 25000	125	460
BS60-M14	IS3120238	Nickel brass		32	60	110	165	≥ 400	≥ 6500	≥ 160	≥ 16000	≥ 25000	90	195
BS60-M16	IS3120240	Nickel brass		32	60	110	165	≥ 400	≥ 6500	≥ 160	≥ 16000	≥ 25000	125	195

1 - Rated insulation Voltage Ui in function of Pollution degree and Overvoltage (Check IEC 60077-1)
2 - Rated Power Frequency Withstand Voltage, dry (50 Hz, 1 min)
Cr - Creepage distance
ML - Maximum load acc to test condtions required by EN 61373
N1 - Flexural strength
N2 - Torsion rupture torque
N3 - Maximum tensile strength
N4 - Compressive strength
TT - Max tigthening torque on threads

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