3EK7 Medium Voltage Surge Arresters with Line Discharge Class 2 www.siemens.com/energy/arrester Siemens cage design 3EK surge arresters for medium voltage are now also available with LD-class 2. The 3EK7 with LD-class 2 is the first choice for protection against power surges in any medium voltage distribution system from 3 kV to 60 kV. and therefore prevent ejection of parts in the event of overload. At the same time, the electric arc can escape directly via the flexible silicone housing which is vulcanized directly onto the active part. This means that high pressure can not build up in the case of overloading. The LD-class 2 will be achieved by special metal oxide varistors with a significant high long duration current impulse capability (550 A/2 ms). The innovative cage design ensures outstanding performance in safety issues. Fiberglass-reinforced plastic rods provide high mechanical strength and optimized performance-to-weight ratio. They enclose the metal oxide blocks firmly and securely The silicone housing is highly resistant to environmental pollution of all kinds, so the 3EK7 with LD-class 2 is perfectly suited for all environments. Silicone is dirt- and water-repellent and the direct-molding-technology reliably prevents the penetration of moisture. The arrester retains its outstanding properties over the entire long service life of the arrester. p.u. Ur Selected accessories 1.3 1.25 1.2 Ø 8… Ø 18 1.15 Ø 8… Ø 18 92 86 1.1 cable Ø 14 … Ø 18 1.05 1 0.95 0.9 t /s cable Ø 8 … Ø 14 Line clamp M11 Line clamp M13 0.1 1 10 100 1000 Preheating to 60°C and stressed with energy acc. to line discharge class 2 prior to TOV Answers for energy. Rated voltage Contin- Maximum values of the residual voltages at discharge uous currents of the following impulses operating voltage Ur kV Uc kV Arrester type Number of units Housing insulation 8/20 µs 8/20 µs 8/20 µs 8/20 µs 8/20 µs 30/60 µs 30/60 µs 1 kA 3 kA 5 kA 10 kA 20 kA 125 A 500 A kV kV kV kV kV kV kV Creepage LightPower disning frequen- tance impulse cy withwithstand stand voltage voltage 1min., 1.2/50 µs wet Flashover distance Specified shortterm load SSL (Fdyn) Specified Height Weight long-term [H] load SLL (Fstat) kV mm N N kV mm mm kg 3 2.4 7.0 7.6 8.0 8.6 9.8 6.2 6.6 3EK7030-5CB4 1 104 49 372 180 2940 2050 170 1.5 6 4.8 14.0 15.2 15.9 17.1 19.7 12.5 13.2 3EK7060-5CB4 1 104 49 372 180 2940 2050 170 1.6 9 7.2 21.0 22.8 23.9 25.7 29.5 18.7 19.8 3EK7090-5CC4 1 122 57 485 210 2500 1750 200 1.9 12 9.6 28.0 30.4 31.8 34.2 39.3 25.0 26.3 3EK7120-5CD4 1 144 67 605 248 2080 1450 240 2.3 15 12.0 35.1 38.0 39.8 42.8 49.2 31.2 32.9 3EK7150-5CD4 1 144 67 605 248 2080 1450 240 2.4 18 14.4 42.1 45.7 47.7 51.3 59.0 37.4 39.5 3EK7180-5CE4 1 166 77 775 286 1850 1290 270 2.8 21 16.8 49.1 53.3 55.7 59.9 68.8 43.7 46.1 3EK7210-5CF4 1 184 86 900 318 1660 1160 300 3.2 24 19.2 56.1 60.9 63.6 68.4 78.7 49.9 52.7 3EK7240-5CH4 1 242 113 1230 418 1250 870 400 4.0 27 21.6 63.1 68.5 71.6 77.0 88.5 56.2 59.3 3EK7270-5CH4 1 242 113 1230 418 1250 870 400 4.1 30 24.0 70.1 76.1 79.5 85.5 98.3 62.4 65.8 3EK7300-5CH4 1 242 113 1230 418 1250 870 400 4.2 33 26.4 77.1 83.7 87.5 94.1 108 68.7 72.4 3EK7330-5CJ4 1 281 131 1420 484 1060 740 470 4.9 36 28.8 84.1 91.3 95.4 103 118 74.9 79.0 3EK7360-5CJ4 1 281 131 1420 484 1060 740 470 5.0 39 31.2 91.1 98.9 103 111 128 81.1 85.6 3EK7390-5CJ4 1 281 131 1420 484 1060 740 470 5.1 42 33.6 98.2 107 111 120 138 87.4 92.2 3EK7420-5CK4 1 302 140 1595 520 980 680 510 5.4 45 36.0 105 114 119 128 147 93.6 98.8 3EK7450-5CP4 2 484 226 2460 836 570 400 840 7.3 48 38.4 112 122 127 137 157 99.9 105 3EK7480-5CP4 2 484 226 2460 836 570 400 840 7.5 51 40.8 119 129 135 145 167 106 112 3EK7510-5CP4 2 484 226 2460 836 570 400 840 7.7 54 43.2 126 137 143 154 177 112 119 3EK7540-5CP4 2 484 226 2460 836 570 400 840 7.9 57 45.6 133 145 151 162 187 119 125 3EK7570-5CP4 2 484 226 2460 836 570 400 840 8.1 60 48.0 140 152 159 171 197 125 132 3EK7600-5CP4 2 484 226 2460 836 570 400 840 8.3 Ø SW14 14 142 227 21.5 3x 12 3 x 12 0° 0° 0 4 20 25 Ø (width across flats 9/16“) 253.5 M12 or 3/8“ Disconnector Mounting plate Published by and copyright © 2011: Siemens AG Energy Sector Freyeslebenstrasse 1, 91058 Erlangen, Germany 74 ø1 38.5 104 94 41 2.5 2.5 ø 20 14 ø 108 154 mm NEMA insulating bracket for U r ≤ 15 kV 41 ø1 38.5 104 94 14.2 18.2 64 31.5 64 31.5 14.2 18.2 74 253.5 20 mm 152 198 NEMA insulating bracket for U r ≤ 36 kV 14 Siemens AG Power Transmission Division High Voltage Products Nonnendammallee 104, 13629 Berlin, Germany Please contact us at: Phone:+49 30 386 33 222 Fax: +49 30 386 26 721 E-mail: [email protected] Power Transmission Division Order No. E50001-G630-A209-X-4A00 Printed in Germany Dispo 30002, c4bs No. 7457 fb 4359 WÜ 11111.0 www.siemens.com/energy/arrester