3EK7 Medium Voltage Silicone Insulated Surge Arresters

Transcription

1 3EK7 Medium Voltage Silicone Insulated Surge Arresters Power Transmission and Distribution

2 Setting new Standards 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. The new 3EK7 surge arrester from Siemens offers superior protection against power surges for the equipment in electrical distribution systems with operating s 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 new 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 light, robust and durable, due to its special cage design. 2

3 3EK7 Design M12 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 M12 or 3 /8 inch stainless steel stud 3EK7 a top quality product Secure and reliable design Fast delivery The silicone rubber (SR) 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 glasscollared 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 an independent test laboratory. The 3EK7 series is based on a cage of pre-stressed fiber-reinforced 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 light design and yet it offers excellent torsional, tensile and cantilever strength: Maximum working cantilever strength of 350 Nm. 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 conditions of industrial areas as well as in desert or coastal regions. 3EK7 arresters are suitable for a temperature range from 55 C to +50 C. Application altitude up to 3600 m a.s.l. 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 and 6). 3

4 3EK7 Arresters According to IEC Selection and Main Data 4 Voltage per unit U r Table 1: IEC power-frequency versus time characteristic Highest for equipment U m [kv] Rated lightning impulse withstand [kv] Solidly earthed neutral system Isolated neutral system Impedance earthed neutral system Time in seconds Nominal discharge current I n 5 ka 10 ka Maximum continous operating U c 48 kv 48 kv Rated U r 60 kv 60 kv Long duration current impulse 150 A 325 A High current pressure relief 20 ka 20 ka Low current pressure relief 600 A 600 A High-current impulse 65 ka 100 ka Maximum permisible static service load 280 Nm 350 Nm Maximum permisible service load (MPSL) 400 Nm 500 Nm Energy absorption capability 2.2 kj/kv U r 3.5 kj/kv U r Table 2: 3EK7 arrester main data Preheating to 40 C Preheating to 60 C and stressing with rated energy Resonant earthed neutral system ; 45; 60 3EK C.. 3EK C.. 3EK C.. 3EK C ; 40 3EK C.. 3EK C.. 3EK C.. 3EK C ; 60; 75 3EK C.. 3EK C.. 3EK C.. 3EK C ; 60 3EK C.. 3EK C.. 3EK C.. 3EK C ; 75; 95 3EK C.. 3EK C.. 3EK C.. 3EK C ; 75; 95 3EK C.. or 3EK C.. 3EK C.. 3EK C.. 3EK C EK C.. - 3EK C ; 110 3EK C.. 3EK C.. 3EK C.. 3EK C EK C.. - 3EK C EK C.. 3EK C.. 3EK C.. 3EK C EK C.. - 3EK C ; 5 3EK C.. 3EK C.. 3EK C.. 3EK C ; 5 3EK C.. 3EK C.. 3EK C.. 3EK C EK C EK C.. - 3EK C EK C.. 3EK C.. 3EK C.. 3EK C EK C.. 3EK C.. 3EK C.. 3EK C EK C.. - 3EK C EK C.. 3EK C.. 3EK C.. 3EK C EK C EK C.. - 3EK C EK C.. 3EK C.. 3EK C.. 3EK C EK C.. 3EK C.. 3EK C.. 3EK C EK C EK C.. - 3EK C EK C.. 3EK C.. 3EK C.. 3EK C EK C.. - 3EK C EK C Table 3: Typical 3EK7 arresters for system s according to IEC Rated U r Continuous operating U c Arrester part number [kv] [kv] 1 ka EK CB EK CB4.0 9* 7.2 3EK CB * 8.4 3EK CB * 9.6 3EK CC * 12 3EK CC EK CD * EK CD EK CE EK CF EK CF EK CH EK CH EK CH EK CH EK CH EK CH EK CK EK CK EK CK EK CK EK CK4 139 Table 4: 3EK7 nominal discharge current 5 ka Rated U r Continuous operating U c Arrester part number [kv] [kv] 1 ka EK CB EK CB EK CB * 7.2 3EK CB * 8.4 3EK CB * 9.6 3EK CC * 12 3EK CC *.4 3EK CD * EK CD * EK CE * EK CE EK CE EK CF * 24 3EK CF EK CH EK CH * EK CH EK CH EK CH EK CH EK CK * EK CK EK CK EK CK EK CK EK CK4 130 Table 5: 3EK7 nominal discharge current 10 ka

5 3 ka 5 ka Maximum discharge 10 ka 15 ka 20 ka 125 A 30/60 µs Creepage Flashover Lightning impulse withstand Height H 1) Net Packed Pallet Qty. per pallet 500 A 30/60 µs [mm] [mm] [kv] [mm] [kg] [kg] [kg] [pcs] ka 5 ka Maximum discharge 10 ka 15 ka 20 ka 125 A 30/60 µs Creepage Flashover Lightning impulse withstand Height H 1) Net Packed Pallet Qty. per pallet 500 A 30/60 µs [mm] [mm] [kv] [mm] [kg] [kg] [kg] [pcs] ) Refer to figure 1 on page 8 (*) Available ex stock 5

6 3EK7 Arresters According to IEEE Std C Selection and Main Data Duty cycle MCOV Arrester part number Voltage per unit MCOV EK7 heavy duty 1.7 3EK7 riser pole Table 6: ANSI temporary over, preheating 60 C, no prior duty Time in seconds FOW 1.5 ka [kv] [kv] 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 9: 3EK7 normal duty Normal duty Heavy duty Riser pole Maximum continous operating MCOV 29 kv 29 kv 29 kv Duty cycle 36 kv 36 kv 36 kv Low-current, long-duration 75 A 250 A 250 A High current pressure relief 20 ka 20 ka 20 ka Low current pressure relief 600 A 600 A 600 A High-current, short-duration 65 ka 100 ka 100 ka Coordinating current 5 ka 10 ka 10 ka Maximum design cantilever load-static (MDCL) 280 Nm 280 Nm 280 Nm Energy absorption capability 2.7 kj/kv MCOV 4.6 kj/kv MCOV 4.6 kj/kv MCOV Table 7: 3EK7 distribution arrester main data System L-L Voltage [kv] Four-wire multigrounded neutral wye Table 8: Typical 3EK7 arresters for system s according to the latest IEEE Std C Three-wire low impedance grounded neutral circuit Three-wire high impedance grounded neutral circuit 2.4 3EK A EK A.. 3EK A.. 3EK A EK A EK A EK A EK A.. 3EK A EK A.. 3EK A EK A.. or 3EK A.. 3EK A EK A.. 3EK A EK A.. or 3EK A.. 3EK A.. 3EK A EK A.. 3EK A EK A.. 3EK A EK A EK A.. 3EK A EK A.. 3EK A EK A.. 3EK A.. Duty cycle MCOV Arrester part number FOW 1.5 ka [kv] [kv] 3* EK AB * 5.1 3EK AB * EK AB * 8.4 3EK7100-3AB EK7120-3AC * EK AD * EK AD * 17 3EK AE EK AF * 22 3EK AF * EK AH EK AH EK AH Table 10: 3EK7 heavy duty Duty cycle MCOV Arrester part number FOW 1.5 ka [kv] [kv] 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 11: 3EK7 riser pole 6

7 3 ka Maximum discharge 5 ka 10 ka 20 ka 40 ka 125 A 45/90 µs Creepage Flashover Lightning impulse withstand Height H 1) Net Packed Pallet Qty. per pallet 500 A 45/90 µs [mm] [mm] [kv] [mm] [kg] [kg] [kg] [pcs] ka Maximum discharge 5 ka 10 ka 20 ka 40 ka 125 A 45/90 µs Creepage Flashover Lightning impulse withstand Height H 1) Net Packed Pallet Qty. per pallet 500 A 45/90 µs [mm] [mm] [kv] [mm] [kg] [kg] [kg] [pcs] ka Maximum discharge 5 ka 10 ka 20 ka 40 ka 125 A 45/90 µs Creepage Flashover Lightning impulse withstand Height H 1) Net Packed Pallet Qty. per pallet 500 A 45/90 µs [mm] [mm] [kv] [mm] [kg] [kg] [kg] [pcs] ) Refer to figure 1 on page 8; (*) Available ex stock 7

8 Drawings and Accessories H* Figure 2: NEMA insulating bracket for U r 21 kv Order code P12; 0.25 kg M12 or 3/ Figure 1: 3EK7 surge arrester main dimensions * please see tables on page 5 or 7 Figure 3: NEMA insulating bracket for U r > 21 kv Order code P12; 0.4 kg Figure 4: DIN insulating bracket for U r 21 kv Order code P22; 0.85 kg Figure 5: DIN insulating bracket for U r > 21 kv Order code P22; 1 kg

9 Figure 6: L-bracket Order code M12; 0.1 kg Figure 7: DIN metal bracket (stainless), Order code P23; 0.6 kg and DIN metal bracket (hot dip galvanised), Order code P21; 0.6 kg 8 or Figure 8: Insulated ground lead/insulated line lead Order code P51/M51; 0.09 kg, 16 mm 2 Figure 9: NEMA metal bracket (hot dip galvanized) Order code P11; 0.6 kg (11 ) (8.7 ) Figure 10: Transformer bracket 8.7 Order code Q11; 0.6 kg Figure 11: Transformer bracket 11 Order code Q12; 0.7 kg 9

10 Drawings and Accessories 310 (12.25 ) (.5 ) Figure 12: Transformer bracket Order code Q13; 0.8 kg Figure 13: Transformer bracket.5 Order code Q; 0.8 kg x Figure : NEMA X-arm bracket Order code Q51; 1.3 kg Figure 15: Mounting plate, 37 mm height Order code Q81; 1.6 kg cable cable Figure 16: Line clamp Order code M11; 0.1 kg Figure 17: Bird protection cap Order code M81; 50 g 10

11 M12 or 3/8 Figure 18: Stainless steel cap Order code M71; 5 g Figure 19: Disconnector Order code P31; 0.1 kg Outline drawings for common design options are shown in figure 20, 21 and 22 Figure 20: 3EK7 surge arrester with accessories P12 and P31 Figure 21: 3EK7 surge arrester with accessories P12, P31 and Q51 Figure 22: 3EK7 surge arrester with accessories P12, P31, P52 and Q11 11

12 Example Part number 3 E K C F 4 Internal use 3 E K 7 Rated in kv x Classification Nominal discharge current I n = 5 ka or distribution class, normal duty 2 Distribution class, heavy duty 3 Nominal discharge current I n = 10 ka or riser pole 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 170 mm B 200 mm C 240 mm D 270 mm E 300 mm F 400 mm H 510 mm K Internal use 4 Standard equipped at high terminal M12 or 3 /8 inch stud with clamp, washer and nut earthing terminal M12 or 3 /8 inch stud with washer and nut Example Part number with mounting accessories 3 E K C F 4 Z M51 M81 P12 P31 For additional parts only* High- terminal equipped with Line clamp, washer, nut L-bracket, washer, nut Line lead, insulated, 450 mm/18 inch, 16 mm 2 Stainless steel cap Bird-protection cap Earth terminal equipped with NEMA metal bracket (hot dip galvanized steel) NEMA insulating bracket DIN metal bracket (hot dip galvanized steel) DIN insulating bracket DIN metal bracket (stainless steel) Disconnector Ground lead, insulated, 450 mm/18 inch, 16 mm 2 Mounting auxiliaries Transformer bracket 8.7 inch Transformer bracket 11 inch Transformer bracket inch Transformer bracket.5 inch X-arm bracket Mounting plate for 200 mm and 10 inch bolt circle *Other additional parts on request Not all combinations are possible Z M11 M12 M51 M71 M81 P11 P21 P22 P23 P51 Q11 Q12 Q13 Q Q51 Q81 P12 P31 Siemens AG Power Transmission and Distribution High Voltage Division (PTD H51) Nonnendammallee Berlin Germany Please contact us at: Phone: +49 (30) arrester@siemens.de Order No. E50001-U113-A306-V Printed in Germany Dispo TH PA The information in this document contains general descriptions of the technical options available, which do not always have to be present in individual cases. The required features should therefore be specified in each individual case at the time of closing the contract.