3EK7 Distribution Class Surge Arresters. Answers for energy.

Transcription

1 3EK7 Distribution Class Surge Arresters Answers for energy.

2 Siemens at Your Service As a global leader of the electronics industries, Siemens has been active in the fields of power transmission and distribution for over 125 years since Werner von Siemens discovered the dynamo-electric principle in This early involvement led to a vast range of products for medium and high voltage applications. Global player with a strong U.S. background Since 1886, Siemens has been serving customers in the United States through dedicated sales and production facilities. Today, Siemens of North America has a workforce of over 70,000 people, who in 2005 reached a turnover of approx billion US$. Our customers rely on our Global Network of Innovation and our ability to deliver perfect solutions and services for any task, from single components to turnkey systems. The better choice: Distribution class surge arresters from Siemens The 3EK7 series of surge arresters is part of our initiative to supply the American market with no less than a top quality product with outstanding technical features and very fast delivery. As a leading company in the field of silicone rubber (SR) insulation and one of the few suppliers with comprehensive in-house research and development capabilities, we have developed the 3EK7 surge arrester series to offer superior protection against power surges for equipment in electrical distribution systems with operating voltages of up to 34.5 kv. 3EK7 surge arresters have been tested per the latest IEEE standards by an independent test laboratory. Their performance in dealing with ground faults and their excellent short- circuit ratings are setting completely new standards in medium voltage applications. 3EK7 a top quality product The SR housing is molded directly onto the MOV blocks and the supporting cage structure. 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. SR 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 SR 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 independent test laboratories. 2

3 3EK7 Design ⅜ inch stainless steel stud Nut, washer Clamp End fitting Silicone housing, directly molded over MOV, fiber-glass rods and end fittings Metal oxide varistor MOV Glass coating Fiber-glass rods End fitting Nut, washer ⅜ inch stainless steel stud Horizontal cross section view of surge arrester Secure and reliable design The 3EK7 series is based on a cage of pre-stressed fiber-glass rods for high mechanical strength. 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, reducing the risk of internal components being ejected. The cage is lightweight design and yet it offers excellent torsional, tensile and cantilever strength: Maximum working cantilever strength of 2400 in-lbf. SR 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 condition of industrial areas as well as for desert or coastal regions. Temperature range 55 C to + 50 C Application altitude up to 12,000 ft. Fast delivery Flexibility in production and in our global network of service and sales facilities provide fast and prompt supply e.g. shipment ex stocks within six days after your order has been received for the surge arresters marked with asterisk (*) (Refer to table on page 4). 3

4 3EK7 Main Data and Selection Electrical and Mechanical Data Maximum continuous operating voltage MCOV Duty cycle voltage High current pressure relief Maximum design cantilever load-static (MDCL) Normal duty 29 kv 36 kv 20 ka 2400 inch-lbf Heavy duty/riser pole Coordinating current 5 ka 10 ka Low-current, long-duration 75 A 250 A High-current, short-duration 65 ka 100 ka Energy absoption capability 2.7 kj/kv MCOV 4.6 kj/kv MCOV Table 1: 3EK7 distribution arrester main data 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 3EK EK EK EK EK EK EK EK EK EK EK EK7 090 or 3EK EK EK EK EK7 100 or 3EK EK EK EK EK EK EK EK EK EK EK EK EK EK7 360 Table 2: Typical 3EK7 arresters for system voltages according to the latest IEEE Std C Duty cycle MCOV Arrester part number FOW 0.5 μs, 5 ka 1.5 ka 3 ka Maximum 5 ka EK AB EK AB * EK AB * 8.4 3EK AB EK AC EK AC * EK AD EK AD EK AE * 22 3EK AF EK AF EK AH EK AH Table 4: 3EK7 normal duty FOW 0.5 μs, 5 ka 1.5 ka 3 ka 5 ka 3 * EK AB * 5.1 3EK AB * EK AB * 8.4 3EK AB EK AC * EK AD * EK AD * 17 3EK AE EK AF * 22 3EK AF * EK AH EK AH EK AH Table 5: 3EK7 heavy duty Voltage per unit MCOV EK7 heavy duty 3EK7 riser pole Time in seconds Table 3: Temporary overvoltage preheating to 60 C, no prior duty FOW 0.5 μs, 5 ka 1.5 ka 3 ka 5 ka EK AB EK AB * EK AB * 8.4 3EK AC EK AD EK AD * EK AE EK AF EK AH * 22 3EK AH EK AH EK AK EK AK Table 6: 3EK7 riser pole 4

5 discharge voltage 10 ka 20 ka 40 ka 125 A Creepage distance Flashover distance LIWV 3) Height H 2) Net weight Packed 1) weight Standard 1) pallet weight Qty. per pallet 500 A [inch] [inch] [inch] [lbs] [lbs] [lbs] [pcs] ka 20 ka 40 ka 125 A 500 A [inch] [inch] [inch] [lbs] [lbs] [lbs] [pcs] ka 20 ka 40 ka 125 A 500 A [inch] [inch] [inch] [lbs] [lbs] [lbs] [pcs] ) Incl. insulating bracket and disconnector, other accessory weights to be added (see next page); 2) Refer to figure 1 on page 6; 3) LIWV: Lightning impulse withstand voltage of the arrester housing ; (*) Available ex stock 5

6 Accessories Outline drawings for common design options are shown in figures 2, 3 and 4 Figure 2: 3EK7 surge arrester with accessories P12 and P31 Figure 3: 3EK7 surge arrester with accessories P12, P31 and Q51 3/8 Ø 4.7 Figure 1: 3EK7 main dimensions; *see tables page 5 3/8 1.4 H* 0.95 Figure 5: Disconnector (order code P31); 0.3 lbs Figure 4: 3EK7 surge arrester with accessories P12, P31, P52 and Q Figure 6: Insulating bracket for duty cycle 3 kv to 21 kv (order code P12); 0.5 lbs Figure 7: Insulating bracket for duty cycle 24 kv and above (order code P12); 0.9 lbs 6

7 Figure 8: Transformer bracket 8.7 inches (order code Q11); 0.6 lbs Figure 9: Transformer bracket 11 inches (order code Q12); 1.8 lbs Figure 10: Transformer bracket inches (order code Q13); 2.0 lbs Figure 11: Transformer bracket 14.5 inches (order code Q14); 2.0 lbs Ø Ø Figure 12: NEMA X-arm bracket (order code Q51); 2.9 lbs Figure 13: NEMA metal bracket (order code P11); 1.3 lbs 5 x 45 5 x 45 Ø 0.4 Ø x 45 5 x Figure 14: Ground strap for duty cycle 3 kv to 21 kv (order code P52); 0.13 lbs Figure 15: Ground strap for duty cycle 24 kv and above (order code P53); 0.2 lbs Ø Ø Ø Ø 0.6 #11 AWG to #6 AWG #11 AWG to #6 AWG #6 AWG to #5 AWG #6 AWG to #5 AWG Figure 16: Insulated ground lead/insulated line lead (order code P51/M51); 0.2 lbs Figure 17: Bird protection cap (order code M81); 0.1 lbs Figure 18: Line clamp (order code M11); 0.2 lbs 7

8 Example Part number 3 E K A E 4 Internal use 3 E K 7 Duty cycle voltage in kv x Classification Distribution class, normal duty 2 Distribution class, heavy duty 3 Riser pole 4 Standard IEEE C62.11 with imperial-thread terminals 3 /8" A IEEE C62.11 with metric-thread terminals M12 B IEC-CEI with metric-thread terminals M12 C Housing size 6.7 inch B 7.9 inch C 9.4 inch D 10.6 inch E 11.8 inch F 15.7 inch H 20.1 inch K For internal administrative purpose 4 Standard equipped with high voltage terminal with 3 /8 inch stud, clamp, washer and nut ground terminal with 3 /8 inch stud, washer and nut Example Part number with mounting accessories 3 E K A E 4 Z M51 M81 P12 P31 Q11 If any accessory is required* Z High-voltage terminal equipped with Line clamp, washer, nut M11 Insulated line lead, 18 inch M51 Bird protection cap M81 Earth terminal equipped with NEMA metal bracket (hot dip galvanized steel) P11 NEMA insulating bracket P12 Disconnector P31 Insulated ground lead, 18 inch P51 Ground strap, 12 inch P52 Ground strap, 18 inch P53 Mounting auxiliaries Transformer bracket 8.7 inch Q11 Transformer bracket 11 inch Q12 Transformer bracket inch Q13 Transformer bracket 14.5 inch Q14 NEMA X-arm bracket Q51 *Other additional parts on request. Published by and copyright 2010: Siemens AG Energy Sector Freyeslebenstrasse Erlangen, Germany Siemens Energy, Inc. Power Transmission Division 444 Highway 49 South Richland, MS Toll-free: +1 (800) Phone: +1 (601) Fax: +1 (601) Power Transmission Division Order No. E50001-F630-A126-X-4AUS Printed in Germany TH PA 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.