Ceramic – Transformator bushings DIN42531 – DIN42532 – DIN42533

Ceramic Transformator bushings

Transformator bushings

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

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

Ceramic transformer bushings - DIN42531 - 250 A

type	Fig.	1	2	3	4	H	Cr	A	d1	d2	d3	d4	d5	d6	n	m	k	h1	h2	h3	Weight
		kV	kV	kV	kV	mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg
10Ni250	A	12	30	40	60	245	180	250	42	33	111	74	100	32	15	22	-	65	25	35	2,6
10Nf250	B	12	35	45	75	295	290	250	42	33	111	74	140	32	15	22	-	65	25	35	3,5
20Nf250	B	24	55	75	125	385	445	250	42	33	111	74	155	32	15	22	-	80	25	35	5,1
30Nf250	B	36	75	95	170	485	600	250	42	33	111	74	155	32	15	22	-	80	25	35	6,5

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

type	Fig.	1	2	3	4	H	Cr	A	d1	d2	d3	d4	d5	d6	n	m	k	h1	h2	h3	Weight
		kV	kV	kV	kV	mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg
10Ni630	A	12	30	40	60	245	190	630	50	39	128	88	110	40	24,5	30,5	-	65	25	35	3,2
10Nf630	B	12	35	45	75	295	295	630	50	39	128	88	150	40	24,5	30,5	-	65	25	35	4,3
20Nf630	B	24	55	75	125	385	445	630	50	39	128	88	165	40	24,5	30,5	-	80	25	35	6,6
30Nf630	B	36	75	95	170	510	645	630	50	39	128	88	180	40	24,5	30,5	-	100	25	35	8,5

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

Ceramic transformer bushings - DIN42533 - 1000A - 3150A

type	Fig.	1	2	3	4	H	Cr	A	d1	d2	d3	d4	d5	d6	n	m	k	h1	h2	h3	Weight
		kV	kV	kV	kV	mm	mm		mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kg
10Nf1000	C	12	35	45	75	325	300	1000	80	58	163	108	170	-	32	46	12	90	30	40	7
20Nf1000	C	24	55	75	125	410	450	1000	80	58	163	108	185	-	32	46	12	100	30	40	8,5
30Nf1000	C	36	75	95	170	540	645	1000	80	58	163	108	200	-	32	46	12	125	30	40	11,0
10Nf3150	C	12	35	45	75	325	300	3150	100	74	183	131	190	-	51	62	17	90	30	40	8,5
20Nf3150	C	24	55	75	125	410	450	3150	100	74	183	131	210	-	51	62	17	100	30	40	10,0
30Nf3150	C	36	75	95	170	540	680	3150	100	74	183	131	230	-	51	62	17	125	30	40	14,0

Monday	8am > 4:30pm
Tuesday	8am > 4:30pm
Wendsday	8am > 4:30pm
Thursday	8am > 4:30pm
Friday	8am > 12am
Saturday	Closed
Sunday	Closed