Product catalog

Transformer high-voltage bushings with voltage 220 kV

 Transformer high-voltage bushings with a voltage of 220 kV with RIP insulation are available with a porcelain insulator (ETFt series) and with a polymer insulator (SETFt series) in accordance with the international standard IEC 60137.

RIP-insulated transformer bushings ETFt/SETFt series        
Technical specifications U measurement 245-A1 245-B1 245-A2 245-B2
Highest operating voltage, Um kV 245 245 245 245
Highest operating phase voltage kV 142 142 142 142
Partial discharge level pCL < 5 < 5 < 5 < 5
Power frequency test voltage 50 Hz, 1 min kV 505 505 505 505
Full wave lightning impulse test voltage 1.2/50 µs kV 1050 1050 1050 1050
Switching impulse test voltage 250/2500 µs kV 750 750 850 850
Typical test voltages          
Full wave lightning impulse test voltage 1.2/50 µs: negative polarity kV 1155 1155 1155 1155
Test voltage of lightning impulse of sheared wave: negative polarity kV 1271 1271 1271 1271
Switching pulse test voltage 250/2500 µs in dry condition: negative polarity kV 825 825 935 935
Maximum operating current: continuous cable connection, Imax A 800 1250 800 1250
Maximum operating current: split current-carrying core, Imax A 1250 2000 1250 2000
Minimum arc path length, SW mm 2432 2434 2866 2866
Creepage distance, min. mm 8753 8755 10348 10348
Leak rate l/s 3.6 3.6 3.6 3.6
Test cantilever load N 4000 5000 4000 5000
Specific creepage distance mm/kV 35.7 35.7 42.2 42.2
Dimensions          
D1 mm 190 210 190 210
D2 mm 120 140 120 140
D3 mm 290 350 290 350
D4 mm 335 400 335 400
D5 mm 200 290 200 290
D6 mm 318 368 318 368
L5 mm 90 90 90 90
d1 mm 50 69 50 69
d2 mm 65 85 65 85
l1 mm 50 50 50 50
s mm 20 20 20 20
i mm 20 20 20 20
z   12 12 12 12
a ° thirty thirty thirty thirty
Contact terminal dimensions d3 x L4 mm mm ≤ 1250 A = Ø 30 x 90; ≤ 1600 A = Ø 42 x 135; ≤ 2500 A = Ø 48 x 135
Size for TT installation          
E mm 0 0 0 0
L1 mm 620 620 620 620
L2 mm 2854 2854 3286 3286
L3 mm 185 185 185 185
Total length, L mm 3474 3474 3906 3906
Size for TT installation          
E mm 300 300 300 300
L1 mm 920 920 920 920
Total length, L mm 3774 3774 4206 4206
Size for TT installation          
E mm 600 600 600 600
L1 mm 1220 1220 1220 1220
Total length, L mm 4074 4074 4506 4506

 Transformer high-voltage bushings with a voltage of 220 kV with RIP insulation are available with a porcelain insulator (ETFt series) and with a polymer insulator (SETFt series) in accordance with the international standard IEC 60137.

RIP-insulated transformer bushings ETFt/SETFt series        
Technical specifications U measurement 245-A1 245-B1 245-A2 245-B2
Highest operating voltage, Um kV 245 245 245 245
Highest operating phase voltage kV 142 142 142 142
Partial discharge level pCL < 5 < 5 < 5 < 5
Power frequency test voltage 50 Hz, 1 min kV 505 505 505 505
Full wave lightning impulse test voltage 1.2/50 µs kV 1050 1050 1050 1050
Switching impulse test voltage 250/2500 µs kV 750 750 850 850
Typical test voltages          
Full wave lightning impulse test voltage 1.2/50 µs: negative polarity kV 1155 1155 1155 1155
Test voltage of lightning impulse of sheared wave: negative polarity kV 1271 1271 1271 1271
Switching pulse test voltage 250/2500 µs in dry condition: negative polarity kV 825 825 935 935
Maximum operating current: continuous cable connection, Imax A 800 1250 800 1250
Maximum operating current: split current-carrying core, Imax A 1250 2000 1250 2000
Minimum arc path length, SW mm 2432 2434 2866 2866
Creepage distance, min. mm 8753 8755 10348 10348
Leak rate l/s 3.6 3.6 3.6 3.6
Test cantilever load N 4000 5000 4000 5000
Specific creepage distance mm/kV 35.7 35.7 42.2 42.2
Dimensions          
D1 mm 190 210 190 210
D2 mm 120 140 120 140
D3 mm 290 350 290 350
D4 mm 335 400 335 400
D5 mm 200 290 200 290
D6 mm 318 368 318 368
L5 mm 90 90 90 90
d1 mm 50 69 50 69
d2 mm 65 85 65 85
l1 mm 50 50 50 50
s mm 20 20 20 20
i mm 20 20 20 20
z   12 12 12 12
a ° thirty thirty thirty thirty
Contact terminal dimensions d3 x L4 mm mm ≤ 1250 A = Ø 30 x 90; ≤ 1600 A = Ø 42 x 135; ≤ 2500 A = Ø 48 x 135
Size for TT installation          
E mm 0 0 0 0
L1 mm 620 620 620 620
L2 mm 2854 2854 3286 3286
L3 mm 185 185 185 185
Total length, L mm 3474 3474 3906 3906
Size for TT installation          
E mm 300 300 300 300
L1 mm 920 920 920 920
Total length, L mm 3774 3774 4206 4206
Size for TT installation          
E mm 600 600 600 600
L1 mm 1220 1220 1220 1220
Total length, L mm 4074 4074 4506 4506