3EK7 Medium Voltage Silicone Insulated Surge Arresters. Answers for energy.

Transcription

1 3EK7 Medium Voltage Silicone Insulated Surge Arresters Answers for energy.

2 Setting Standards The 3EK7 surge arrester from Siemens offers since 1999 superior protection against power surges for the equipment in electrical distribution systems with operating voltages of up to 72.5 kv. Besides being highly resistant to environmental pollution of all kinds, its performance in dealing with earth faults and its excellent short-circuit ratings are setting entirely new standards. The silicone on the 3EK7 surge arrester refuses to allow any deposits of pollution or films of moisture to form on it. Thus, surface currents caused by pollution will virtually not occur. The 3EK7 arrester is also very lightweight, robust and durable, due to its special Cage Design. The 3EK7 s mechanical features: Glass-collared MOV, Silicone rubber housing, FRP rods and Aluminium end fittings. Three types of 3EK7 surge arresters are available: 3EK7 -. C.. surge arresters according to IEC with metric thread, 3EK A.. surge arresters according to IEEE Std C with imperial thread. For special applications: 3EK B.. surge arresters according to IEEE Std C with metric thread. 2

3 3EK7 Design 3EK7 a top quality product The silicone rubber housing is molded directly onto the MOV blocks and the protection cage. It provides an excellent sealing system against moisture ingress and partial discharges. In addition, the MOV blocks are glass-collared to prevent aging. Highest quality materials. Silicone rubber is highly hydrophobic and maintains this ability to repel water and any deposits of pollution throughout its entire service life. This results in high tracking and erosion resistance. Furthermore, the silicone rubber housing is self-extinguishing and flame-retardant. These advantages provide maintenance free and reliable service life for 3EK7 arresters. Manufacturing plants are certified under ISO 9001 and ISO EK7 arresters have been type tested by an independent test laboratory. Secure and reliable design The 3EK7 series is based on a cage of pre-stressed fiberreinforced plastic rods for high mechanical strength, reducing the risk of internal components being ejected. In the extremely rare event of the resistors being overloaded, arcing cannot result in a build-up of critical internal pressure, since the resistors are not enclosed in a sealed mechanical shell. Thus, the arc can escape through the silicone sheath, leaving the mechanical support structure of the enclosure unharmed. The cage is lightweight design and yet it offers excellent torsional, tensile and cantilever strength: Maximum working cantilever strength of 350 Nm. Silicone rubber is resistant to UV and ozone exposure as well as to all common organic and non-organic solvents and cleaning agents. Therefore, the 3EK7 is suitable for any environmental conditions of industrial areas as well as in desert or coastal regions. 3EK7 arresters are suitable for a temperature range from 55 C to + C. Application altitude up to 30 m a.s.l. Fast delivery Flexibility in production and in our global network of service and sales facilities provide fast and prompt supply. or 3/8 inch stainless steel stud Nut, washer Clamp End fitting Silicone housing, directly molded Metal oxide varistor MOV Glass coating FRP rods End fitting Nut, washer or 3/8 inch stainless steel stud 3

4 Selection and Main Data 3EK7 Arresters According to IEC Voltage per unit U r Preheating to C and stressed with one high current impulse prior to TOV Nominal discharge current I n Maximum continuous operating voltage U c Rated voltage U r 10 ka 48 kv kv 1.05 Long-duration current impulse 325 A 1.0 Rated short-circuit current ka 0.95 Low short-circuit current High-current impulse 0 A 100 ka 0.9 Specified long-term load SLL (F stat ) 350 Nm Time in seconds Specified short-term load SSL (F dyn ) Energy absorption capability (thermal) 500 Nm 3.5 kj/kv U r Table 1: IEC power-frequency voltage versus time characteristic Table 2: 3EK7 arrester main data Rated voltage Continuous operating voltage Arrester type Maximum values of the residual voltages at discharge currents of the following impulses Creepage distance U r U c 1 ka 3 ka 5 ka 10 ka ka / µs 125 A / µs 500 A [mm] EK7 0-4 C B EK C B EK7 0-4 C B EK C B EK7 1-4 C C EK C C EK C D EK C D EK C E EK C E EK7 0-4 C F EK7 3-4 C H EK7 3-4 C H EK C H EK7 4-4 C H EK C H EK C H EK C J EK C J EK C J EK7 0-4 C J EK7 0-4 C K Table 4: 3EK7 nominal discharge current 10 ka 4

5 Highest voltage for equipment U m Rated lightning impulse withstand voltage Solidly earthed neutral system Isolated neutral system Impedance earthed neutral system Resonant earthed neutral system 2.75 ; 45; 3EK7 0-.C.. 3EK C.. 3EK7 0-.C.. 3EK C ; 40 3EK7 0-.C.. 3EK C.. 3EK7 0-.C.. 3EK C ; ; 75 3EK C.. 3EK C.. 3EK C.. 3EK C ; 3EK7 0-.C.. 3EK C.. 3EK C.. 3EK C ; 75; 95 3EK C.. 3EK C.. 3EK C.. 3EK C.. 12 ; 75; 95 3EK C.. 3EK C.. 3EK C.. 3EK C ; 110 3EK7 1-.C.. 3EK C.. 3EK C.. 3EK C EK C.. 3EK7 2-.C.. 3EK C.. 3EK7 2-.C ; 145 3EK C.. 3EK7 0-.C.. 3EK C.. 3EK7 0-.C ; 145 3EK C.. 3EK7 3-.C.. 3EK7 2-.C.. 3EK7 3-.C EK C.. 3EK7 3-.C.. 3EK C.. 3EK7 3-.C.. 1 3EK C.. 3EK C.. 3EK C.. 3EK C EK C.. 3EK C.. 3EK7 3-.C.. 3EK C EK7 0-.C.. 3EK C.. 3EK7 3-.C.. 3EK C EK7 3-.C.. 3EK C.. 3EK7 3-.C.. 3EK C EK C.. 3EK7 0-.C.. 3EK7 4-.C.. 3EK7 0-.C EK7 4-.C.. 3EK C EK C.. Table 3: Typical 3EK7 arresters for system voltages according to IEC Flashover distance Housing insulation Specified short-term load SSL (F dyn ) Specified long-term load SLL (F stat ) Height H 1) Weight [mm] Lightning impulse withstand voltage 1.2/50 µs Power frequency withstand voltage 1 min., wet [N] [N] [mm] [kg] ) Refer to figure 1 on page 8 5

6 Selection and Main Data 3EK7 Arresters According to IEEE Std C Voltage per unit MCOV Table 5: ANSI temporary overvoltage Preheating to 140 F/ C no prior duty heavy duty riser pole Time in seconds Heavy duty Riser pole Maximum continuous operating voltage 29 kv 29 kv MCOV Duty-cycle voltage 36 kv 36 kv Short-circuit current 0.2 s ka ka Low-current, long-duration 250 A 250 A Low-current pressure relief 0 A 0 A High-current, short-duration 100 ka 100 ka Lightning impulse classifying current 10 ka 10 ka Energy absorption capability (thermal) 4.6 kj/kv MCOV 4.6 kj/kv MCOV Maximum design cantilever load-static (MDCL) 2478 inch-lbf 2478 inch-lbf Table 6: 3EK7 distribution arrester main data Duty-cycle voltage MCOV TOV Capability w/o duty for 0.1s Arrester part number FOW cr 3EK7 heavy duty 1.5 ka cr 3 ka cr 5 ka cr Protective Level Maximum discharge voltage EK7 0-3 A B EK7 0-3 A B EK A B EK A B EK7 1-3 A C EK A D EK A D EK A E EK A F EK A F EK7 0-3 A H EK7 3-3 A H EK7 3-3 A H ka cr ka cr 40 ka cr 45/90 µs 125 A cr 6 Duty-cycle voltage MCOV TOV Capability w/o duty for 0.1s Arrester part number FOW cr 3EK7 riser pole 1.5 ka cr 3 ka cr 5 ka cr Protective Level Maximum discharge voltage EK7 0-4 A B EK7 0-4 A B EK A B EK A C EK7 1-4 A D EK A D EK A E EK A F EK A H EK A H EK7 0-4 A H EK7 3-4 A J EK7 3-4 A K ka cr ka cr 40 ka cr 45/90 µs 125 A cr

7 System L-L Voltage Four-wire multigrounded neutral wye Three-wire low impedance grounded neutral circuit Three-wire high impedance grounded neutral circuit 2.4 3EK7 0-.A EK7 0-.A.. 3EK7 0-.A.. 3EK7 0-.A EK7 0-.A EK7 0-.A EK A EK7 0-.A.. 3EK A EK A.. 3EK7 1-.A EK A.. or 3EK A.. 3EK A EK A.. 3EK A EK A.. or 3EK7 1-.A.. 3EK A EK A.. 3EK A EK A.. 3EK A.. Table 7: Typical 3EK7 arresters for system voltages according to the latest IEEE Std C EK A EK7 0-.A EK A.. 3EK A EK A.. 3EK7 0-.A EK A.. 3EK7 3-.A.. Creepage distance Flashover distance Power frequency withstand voltage 1 min., wet Lightning impulse withstand voltage 1.2/50 µs Height H 1) Weight 45/90 µs 500 A cr [inch] [inch] [inch] [lbs] Table 8: 3EK7 heavy duty Creepage distance Flashover distance Power frequency withstand voltage 1 min., wet Lightning impulse withstand voltage 1.2/50 µs Height H 1) Weight 45/90 µs 500 A cr [inch] [inch] [inch] [lbs] ) Refer to figure 1 on page 8 Table 9: 3EK7 riser pole 7

8 Drawings and Accessories Figure 2: NEMA insulating bracket for U r 15 kv Order code P12; 0.35 kg Figure 1: 3EK7 surge arrester main dimensions * please see tables on page 5 or 7 Figure 3: NEMA insulating bracket for U r 36 kv Order code P12; 0.5 kg Ø 12.5 Ø H* Ø Ø Figure 4: DIN insulating bracket for U r 15 kv Order code P22; 0.85 kg Figure 5: DIN insulating bracket for U r 36 kv Order code P22; 1.0 kg 8

9 SW14 (width across flats 9/16") (214) (173) Ø or 3/8" Figure 6: Disconnector Order code P31; 0.1 kg Figure 7: Bird protection cap Order code M81; 50 g Ø Figure 8: L-bracket Order code ; 0.1 kg Figure 9: DIN metal bracket (hot dip galvanised) Order code P21; 0.6 kg (15) (87) Ø 13 Ø 13 Ø 14 or 10.2 Ø 14 (17) Figure 10: Insulated ground lead/insulated line lead Order code R51; 0.09 kg, 16 mm 2 Figure 11: NEMA metal bracket (hot dip galvanized) Order code P11; 0.6 kg (8.7") (11") (26) () Ø 75 (15) Ø 13 Ø Ø ø Figure 12: Transformer bracket 8.7" Order code Q11; 0.6 kg Figure 13: Transformer bracket 11" Order code Q12; 0.7 kg Ø ø0 9

10 Drawings and Accessories (12.25") (14.5") Figure 14: Transformer bracket 12.25" Order code Q13; 0.8 kg Figure 15: Transformer bracket 14.5" Order code Q14; 0.8 kg Ø 0 Ø ø Ø 18 3 x Figure 16: NEMA X-arm bracket Order code Q51; 1.3 kg Figure 17: Mounting plate, 37 mm height Order code Q81; 1.6 kg M M13 86 (8) cable Ø 8 Ø 14 78,5 Ø 12.5 ø (8) 25, ,5 0 3 (15) (87) , (15) (87) 24 cable Ø 14 Ø 18 Ø ø0 Figure 18: Line clamp Order code M11 or M13; 0.1 kg Figure 19: Stainless steel cap Order code M71; 5 g Ø ø0 10

11 Order information Outline drawings for common design options are shown in figure, 21 and 22 Figure : 3EK7 surge arrester with accessories P12 and P31 Figure 21: 3EK7 surge arrester with accessories P12, P31 and Q51 Part number 3 E K C F 4 Z R51 M81 P12 P31 Medium voltage surge arrester 3 E K 7 Rated voltage in kv x 10 0 Classification Distribution class, heavy duty (IEEE) 3 Nominal discharge current I n = 10 ka (IEC) or distribution class, riser pole (IEEE) 4 Standard IEEE Std C with imperial-thread terminals A IEEE Std C with metric-thread terminals B IEC with metric-thread terminals C Housing size, creepage distance 170 mm B 0 mm C 240 mm D 270 mm E 0 mm F 400 mm H 470 mm J 510 mm K Form of sheds Alternating sheds 4 Accessories* Z High-voltage terminal equipped with Line clamp M11 M11 L-bracket Line clamp M13 M13 Line lead, insulated, 455 mm/18 inch, 16 mm 2 R51 Stainless steel cap M71 Bird protection cap M81 Earth terminal equipped with 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 strap, 245 mm P52 Ground lead, insulated, 455 mm/18 inch, 16 mm 2 R51 Mounting auxiliaries Transformer bracket (8.7 inch) Q11 Transformer bracket (11 inch) Q12 Transformer bracket (12.25 inch) Q13 Transformer bracket (14.5 inch) Q14 X-arm bracket Q51 Mounting plate for 0 mm and 10 inch bolt circle Q81 *Other additional parts on request, not all combinations are possible Standard accessories at Figure 22: 3EK7 surge arrester with accessories P12, P31, P52 and Q11 high-voltage terminal: or 3/8 inch stud, standard clamp, washer and nut earthing terminal: or 3/8 inch stud, washer and nut 11

12 Published by and copyright 11: Siemens AG Energy Sector Freyeslebenstrasse Erlangen, Germany Siemens AG Energy Sector Power Transmission Division High Voltage Products Nonnendammallee Berlin, Germany Please contact us at: Phone: Fax: arrester.energy@siemens.com Power Transmission Division Order No. E50001-G6-A110-V2-4A00 Printed in Germany Dispo 002 c4bs No TH WÜ WS Printed on elementary chlorine-free bleached paper. 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.