3EK4 Medium Voltage Silicone Housed Surge Arresters www.siemens.com/energy/arrester Answers for energy. 3EK4 Optimum Performance thanks to the unique Cage Design™ 3EK4 – Housing Sizes B C F J K Your benefits at a glance 2 ■ Superior The 3EK4’s superior electrical and mechanical performance-to-weight ratio is setting entirely new standards ■ Safe The 3EK4’s proven cage design provides outstanding performance in safety issues ■ Long-lasting With its high-quality directly molded silicone housing, the 3EK4 surge arrester features prevention of partial discharges and ultimate protection against moisture ingress for a long service life M R 3EK4 Cage Design M12 stainless steel stud Nut, washer, stainless steel Standard clamp, stainless steel Stainless steel end cap End fitting Silicone housing, directly molded Metal oxide varistor (MOV) FRP* rods End fitting Stainless steel end cap Nut, washer, stainless steel M12 stainless steel stud ■ Best Protection Choice The 3EK4 surge arresters from Siemens offer the best choice for the protection against power surges in mediumvoltage distribution systems. Its ratings are suitable for system voltages (Um) up to 40.5 kV. ■ Superior Design The 3EK4’s most innovative feature is the Siemens cage design: Preloaded fibre-reinforced plastic rods are used for high mechanical strength and optimized performance-to-weight ratios. The cage design also features a directly molded silicone rubber housing. The silicone is vulcanized directly onto the metal oxide varistor (MOV) blocks by using hightemperature and high-pressure injection molding; this effectively eliminates partial discharges and moisture ingress. ■ *FRP: Fibre-reinforced plastic Superior Quality The high-quality UV-resistant silicone rubber is hydrophobic and repels water and any pollution. It is resistant to ozone, all common organic and inorganic solvents and cleaning agents. This results in excellent pollution handling characteristics without any ageing effects. It makes the 3EK4 perfect for applications in any environment including industrial, coastal or desert areas. The MOV blocks used provide excellent residual voltage values for lightning and switching impulses to protect distribution transformers. Additionally they also do not suffer from ageing effects. This makes the 3EK4 surge arrester a long-lasting asset with lowest life-cycle costs. ■ Superior Safety Siemens believes that safety is paramount. This is why a silicone rubber housing is used which is flameretardant and self-extinguishing. Further the content of combustible material in the fibreglass structure has been mimized so that any fire hazard is reduced to an absolute minimum. The 3EK4 surge arrester has also been extensively type tested. Notably it has passed the short circuit type test according to Edition 2.2 of IEC 60099-4. In this test the surge arrester has successfully demonstrated its safe behavior under realistic fault conditions using the so called pre-failing method (no use of fuse wires). The 3EK4 ensures the safety of personnel, the public and the network. 3 3EK4 Surge Arresters According to IEC 60099-4 Nominal discharge current In 8/20 μs 10 kA Line discharge class (LDC) 1 Maximum continuous operating voltage Uc 28.8 kV Rated voltage Ur 36 kV Long duration current impulse 2 ms 325 A High current pressure relief 20 kA Low current pressure relief 600 A High-current impulse 4/10 μs 100 kA Specified long-term load SLL (Mstat) 175 Nm Specified short-term load SSL (Mdyn) 250 Nm Energy absorption capability (thermal) 3.5 kJ/kVr Table 1: 3EK4 surge arrester general technical data Highest voltage for equipment Um Rated lightning impulse withstand voltage Solidly earthed neutral system Isolated neutral system Impedance earthed neutral system Resonant earthed neutral system [kV] [kV] 2.75 30; 45; 60 3EK4 030-.C.. 3EK4 050-.C.. 3EK4 030-.C.. 3EK4 050-.C.. 3.6 20; 40 3EK4 030-.C.. 3EK4 050-.C.. 3EK4 030-.C.. 3EK4 050-.C.. 5.5 45; 60; 75 3EK4 050-.C.. 3EK4 090-.C.. 3EK4 050-.C.. 3EK4 090-.C.. 7.2 40; 60 3EK4 060-.C.. 3EK4 090-.C.. 3EK4 090-.C.. 3EK4 090-.C.. 8.25 60; 75; 95 3EK4 090-.C.. 3EK4 120-.C.. 3EK4 090-.C.. 3EK4 120-.C.. 12 60; 75; 95 3EK4 090-.C.. 3EK4 150-.C.. 3EK4 120-.C.. 3EK4 150-.C.. 15.5 85; 110 3EK4 120-.C.. 3EK4 210-.C.. 3EK4 150-.C.. 3EK4 210-.C.. 17.5 95 3EK4 150-.C.. 3EK4 220-.C.. 3EK4 150-.C.. 3EK4 220-.C.. 24 125; 145 3EK4 180-.C.. 3EK4 300-.C.. 3EK4 210-.C.. 3EK4 300-.C.. 25 125; 145 3EK4 210-.C.. 3EK4 330-.C.. 3EK4 220-.C.. 3EK4 330-.C.. 27 150 3EK4 210-.C.. 3EK4 360-.C.. 3EK4 240-.C.. 3EK4 360-.C.. 30 160 3EK4 240-.C.. – 3EK4 270-.C.. – 36 170 3EK4 270-.C.. – 3EK4 330-.C.. – 38 125; 150; 200 3EK4 300-.C.. – 3EK4 330-.C.. – 190 3EK4 330-.C.. – 3EK4 360-.C.. – 40.5 Table 2: Typical 3EK4 surge arresters for system voltages according to IEC 60099-4 4 Voltage per Unit [V/Ur] 1.25 Preheating to 40 °C Preheating to 60 °C and stressed with energy acc. to line discharge class 1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.1 1 10 100 1000 Time in seconds 10000 Table 3: IEC power-frequency voltage vs. time (U-t) characteristic Rated Continuous voltage operating Ur voltage Uc Maximum values of the residual voltages at discharge currents of the following impulses Part number 8/20 µs 1 kA [kV] 8/20 µs 3 kA [kV] 8/20 µs 5 kA [kV] 8/20 µs 10 kA [kV] Housing insulation Lightning Power impulse frequency withstand withstand 8/20 µs 30/60 µs 30/60 µs voltage voltage 20 kA 125 kA 500 A 1.2/50 µs 1 min., wet [kV] [kV] [kV] [kV] [kV] [kV] [kV] 3 2.4 3EK4 030-1CB4 6.4 7.1 7.4 8.0 9.1 5.8 6.1 65 6 4.8 3EK4 060-1CB4 12.7 14.2 14.8 15.9 18.3 11.6 12.2 9 7.2 3EK4 090-1CC4 19.1 21.2 22.2 23.9 27.4 17.4 12 9.6 3EK4 120-1CC4 25.4 28.3 29.6 31.8 36.6 15 12.0 3EK4 150-1CF4 31.8 35.4 37.0 39.8 18 14.4 3EK4 180-1CJ4 38.2 42.5 44.4 21 16.8 3EK4 210-1CJ4 44.5 49.5 24 19.2 3EK4 240-1CK4 50.9 27 21.6 3EK4 270-1CM4 30 24.0 33 36 Height FlashH Creepage over Net (see fig. 1) distance distance weight [mm] [mm] [mm] [kg] 27 96 280 112 0.8 65 27 96 280 112 0.9 18.4 87 36 137 420 150 1.2 23.2 24.5 87 36 137 420 150 1.3 45.7 29.0 30.6 99 41 160 550 170 1.6 47.7 54.9 34.8 36.7 123 51 204 690 212 2.0 51.8 55.7 64.0 40.6 42.9 123 51 204 690 212 2.1 56.6 59.1 63.6 73.1 46.4 49.0 140 58 234 820 242 2.3 57.2 63.7 66.5 71.6 82.3 52.2 55.1 161 67 270 960 278 2.7 3EK4 300-1CM4 63.6 70.8 73.9 79.5 91.4 58.0 61.2 161 67 270 960 278 2.8 26.4 3EK4 330-1CR4 70.0 77.8 81.3 87.5 101 63.8 67.3 191 79 320 1200 330 3.2 28.8 3EK4 360-1CR4 76.3 84.9 88.7 95.4 110 69.6 73.5 191 79 320 1200 330 3.3 Table 4: 3EK4 part numbers and technical data (other voltages available on request) 5 3EK4 Accessories 3-D views for common design options 36 H* 36 M12 M12 Figure 2: 3EK4 surge arrester with accessories P12, P31 and M81 111 Figure 1: 3EK4 surge arrester overall dimensions * please refer to table 4 6 Figure 3: 3EK4 surge arrester with accessory P21 14.2 14.2 69.6 27 69.6 27 202 158.7 14 41 5 12. 5 12. 152 Figure 4: NEMA insulating bracket for Ur ≤ 15 kV Figure 5: NEMA insulating bracket for Ur > 15 kV Order code P12; 0.25 kg Order code P12; 0.35 kg 17 26 50 50 17 26 14.5 12 156 14.5 91 91 20 20 108 12 14 44 41 44 200 Figure 6: DIN insulating bracket for Ur ≤ 15 kV Figure 7: DIN insulating bracket for Ur > 15 kV Order code P22; 0.85 kg Order code P22; 1 kg 7 3EK4 Accessories 8 14.5 12 14 50 26 60 14 15 197 152 202 20 30 14 152 Figure 8: DIN metal bracket (hot dip galvanized steel) Order code P21; 0.6 kg Figure 9: NEMA metal bracket (hot dip galvanized steel), thickness 8 mm Order code P11; 0.6 kg 75 37 16 13 25 4 14 0 5 33 13 20 12. 227 20 40 254 8 Figure 10: Mounting plate Figure 11: L-bracket Order code Q81; 1.6 kg Order code M12; 0.1 kg 106 61 max. 57 15 36 Figure 12: Bird protection cap Order code M81; 42 g cable 14 … 8 …18 14 8 …18 92 8… 86 cable 18 Figure 13: Line clamp M11 Figure 14: Line clamp M13 Order code M11; 0.1 kg Order code M13; 0.1 kg 13.1 13.1 455 M12 Figure 15: Disconnector Figure 16: Insulated line/ground lead Order code P31; 0.1 kg Order code R51; 0.1 kg, conductor cross-section 16 mm2 9 Clearances a a b Figure 17: Clearances between surge arrester and earth Ur kV a (center-center) mm b (center-ground) mm 3 140 90 6 140 90 9 170 120 12 170 120 15 210 130 18 220 145 21 240 165 22 250 175 24 270 185 25 280 190 27 290 205 30 320 225 31.5 330 235 33 340 245 36 370 265 Table 5: Minimum recommended clearances 10 Ordering information Part number with accessories 3 E K 4 Medium voltage arresters 3 E K 4 Rated voltage in kV x 10 – 120 – 1 C C 4 –Z M81 P12 P31 120 – Classification, Nominal discharge current 10 kA 1 Standard IEC 60099-4 with metric-thread M12 terminals C Creepage distance 280 mm B 420 mm C 550 mm F 690 mm J 820 mm K 960 mm M 1200 mm R Form of sheds Alternating sheds Accessories* 4 Z Line terminal Line clamp M11 M11 L-bracket M12 Line clamp M13 M13 Line lead, insulated l = 455 mm R51 M81 Bird protection cap Ground terminal NEMA metal bracket (hot dip galvanized steel) P11 NEMA insulating bracket P12 DIN metal bracket (hot dip galvanized steel) P21 DIN insulating bracket P22 Disconnector P31 Ground lead, insulated l = 455 mm R51 Mounting plate for 200 – 254 mm bolt circle Q81 *Other additional parts on request, not all combinations are possible Standard accessories at ■ ■ Line terminal: M12 stud, standard clamp, washer and nut Ground terminal: M12 stud, washer and nut 11 Published by and copyright © 2011: Siemens AG Energy Sector Freyeslebenstraße 1 91058 Erlangen, Germany Siemens AG Energy Sector Power Transmission Division High Voltage Products Nonnendammallee 104 13629 Berlin, Germany www.siemens.com/energy/arrester 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-A135-V1-4A00 | Printed in Germany Dispo 30002 | c4bs No. 7457 TH 263-101197 | BR | 472200 | PA | 03111.5 All rights reserved. Trademarks mentioned in this document are the property of Siemens AG, its affiliates, or their respective owners. Subject to change without prior notice. The information in this document contains general descriptions of the technical options available, which may not apply in all cases. The required technical options should therefore be specified in the contract.