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Answers for energy.

www.siemens.com/energy/arrester

3EK7 Medium Voltage

Silicone Insulated Surge Arresters


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The 3EK7 surge arrester from Siemens offers since 1999

superior protection against power surges for the equip-

ment 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.

Setting Standards

The 3EK7s 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 arrestersaccording to IEC 60099-4with metric thread,

3EK7...-. A.. surge arrestersaccording to IEEE Std C 62.11with imperial thread.

For special applications:

3EK7...-. B.. surge arrestersaccording to IEEE Std C 62.11with metric thread.


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3EK7 Design

3EK7 a top quality product

The silicone rubber housing is molded directly onto

the MOV blocks and the protection cage. It providesan excellent sealing system against moisture ingressand partial discharges. In addition, the MOV blocksare glass-collared to prevent aging.

Highest quality materials. Silicone rubber is highlyhydrophobic and maintains this ability to repel waterand any deposits of pollution throughout its entireservice life. This results in high tracking and erosionresistance. Furthermore, the silicone rubber housingis self-extinguishing and flame-retardant. These advan-tages provide maintenance free and reliable servicelife for 3EK7 arresters.

Manufacturing plants are certified under ISO 9001and ISO 14001.

3EK7 arresters have been type tested by an indepen-dent test laboratory.

Secure and reliable design

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 over-loaded, arcing cannot result in a build-up of critical

internal pressure, since the resistors are not enclosedin a sealed mechanical shell. Thus, the arc can escape

through the silicone sheath, leaving the mechanicalsupport structure of the enclosure unharmed.

The cage is lightweight design and yet it offers excel-lent torsional, tensile and cantilever strength: Maximumworking cantilever strength of 350 Nm.

Silicone rubber is resistant to UV and ozone exposure aswell as to all common organic and non-organic solventsand cleaning agents. Therefore, the 3EK7 is suitable forany environmental conditions of industrial areas as wellas in desert or coastal regions.

3EK7 arresters are suitable for a temperature rangefrom 55 C to +60 C.

Application altitude up to 3600 m a.s.l.

Fast delivery

Flexibility in production and in our global networkof service and sales facilities provide fast and promptsupply.

M12 or 3/8 inch stainless steel stud

End fitting

Silicone housing,

directly molded

Metal oxide varistor MOV

FRP rods

End fitting

M12 or 3/8 inch stainless steel stud

ClampNut, washer

Nut, washer

Glass coating


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4

Selection and Main Data

3EK7 Arresters According to IEC 60099-4

Table 1: IEC power-frequency voltage versus time characteristic

Nominal dischargecurrent In

10 kA

Maximum continuousoperating voltage Uc

48 kV

Rated voltage Ur 60 kV

Long-durationcurrent impulse

325 A

Rated short-circuit current 20 kA

Low shor t-circuit current 600 A

High-current impulse 100 kA

Specified long-term loadSLL (Fstat)

3 50 Nm

Specified short-term load

SSL (Fdyn)5 00 Nm

Energy absorptioncapability (thermal)

3.5 kJ/kV Ur

Rated

voltage

Continuous

operating

voltage

Arrester type Maximum values of the residual voltages

at discharge currents of the following impulses

Creep

dista

Ur[kV]

Uc[kV]

8/20 s1 kA[kV]

8/20 s3 kA[kV]

8/20 s5 kA[kV]

8/20 s10 kA[kV]

8/20 s20 kA[kV]

30/60 s125 A[kV]

30/60 s500 A[kV] [mm

3 2.4 3EK7 030 - 4 C B 4 6.5 7.1 7.4 8.0 9.1 5.8 6.1 37

5 4.0 3EK7 050 - 4 C B 4 10.9 11.8 12.3 13.3 15.2 9.7 10.2 37

6 4.8 3EK7 060 - 4 C B 4 13.0 14.2 14.8 15.9 18.3 11.6 12.2 37

9 7.2 3EK7 090 - 4 C B 4 19.6 21.2 22.2 23.9 27.4 17.4 18.4 37

12 9.6 3EK7 120 - 4 C C 4 26.1 28.3 29.6 31.8 36.6 23.2 24.5 48

15 12.0 3EK7 150 - 4 C C 4 32.6 35.4 37.0 39.8 45.7 29.0 30.6 48

18 14.4 3EK7 180 - 4 C D 4 39.1 42.5 44.4 47.7 54.9 34.8 36.7 60

21 16.8 3EK7 210 - 4 C D 4 45.6 49.5 51.8 55.7 64.0 40.6 42.9 60

24 19.2 3EK7 240 - 4 C E 4 52.2 56.6 59.1 63.6 73.1 46.4 49.0 77

27 21.6 3EK7 270 - 4 C E 4 58.7 63.7 66.5 71.6 82.3 52.2 55.1 77

30 24.0 3EK7 300 - 4 C F 4 65.2 70.8 73.9 79.5 91.4 58.0 61.2 90

33 26.4 3EK7 330 - 4 C H 4 71.7 77.8 81.3 87.5 101 63.8 67.3 123

36 28.8 3EK7 360 - 4 C H 4 78.2 84.9 88.7 95.4 110 69.6 73.5 12339 31.2 3EK7 390 - 4 C H 4 84.7 92.0 96.1 103 119 75.4 79.6 123

42 33.6 3EK7 420 - 4 C H 4 91.3 99.1 104 111 128 81.2 85.7 123

45 36.0 3EK7 450 - 4 C H 4 97.8 106 111 119 137 87.1 91.8 123

48 38.4 3EK7 480 - 4 C H 4 104 113 118 127 146 92.9 97.9 123

51 40.8 3EK7 510 - 4 C J 4 111 120 126 135 155 98.7 104 142

54 43.2 3EK7 540 - 4 C J 4 117 127 133 143 165 104 110 142

57 45.6 3EK7 570 - 4 C J 4 124 134 140 151 174 110 116 142

60 48.0 3EK7 600 - 4 C J 4 130 142 148 159 183 116 122 142

60 48.0 3EK7 600 - 4 C K 4 130 142 148 159 183 116 122 159

Table 2: 3EK7 arrester main data

Table 4: 3EK7 nominal discharge current 10 kA

Voltage per unit Ur

1.15

1.1

1.05

1.0

0.95

0.9

0.85

0.1 1 10

1.2

0.8

Time inseconds

Preheating to 60C and stressed with

one high current impulse prior to TOV

100 1000


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Highest voltage

for equipment

Um

[kV]

Rated lightning

impulse withstand

voltage

[kV]

Solidly earthed

neutral system

Isolated

neutral system

Impedance earthed

neutral system

Resonant earthed

neutral system

2.75 30; 45; 60 3EK7 030-.C.. 3EK7 050-.C.. 3EK7 030-.C.. 3EK7 050-.C..

3.6 20; 40 3EK7 030-.C.. 3EK7 050-.C.. 3EK7 030-.C.. 3EK7 050-.C..

5.5 45; 60; 75 3EK7 050-.C.. 3EK7 090-.C.. 3EK7 050-.C.. 3EK7 090-.C..

7.2 40; 60 3EK7 060-.C.. 3EK7 090-.C.. 3EK7 090-.C.. 3EK7 090-.C..

8.25 60; 75; 95 3EK7 090-.C.. 3EK7 105-.C.. 3EK7 090-.C.. 3EK7 105-.C..

12 60; 75; 95 3EK7 090-.C.. 3EK7 150-.C.. 3EK7 105-.C.. 3EK7 150-.C..

15.5 85; 110 3EK7 120-.C.. 3EK7 210-.C.. 3EK7 150-.C.. 3EK7 210-.C..

17.5 95 3EK7 150-.C.. 3EK7 220-.C.. 3EK7 150-.C.. 3EK7 220-.C..

24 125; 145 3EK7 180-.C.. 3EK7 300-.C.. 3EK7 210-.C.. 3EK7 300-.C..

25 125; 145 3EK7 210-.C.. 3EK7 330-.C.. 3EK7 220-.C.. 3EK7 330-.C..

27 150 3EK7 210-.C.. 3EK7 360-.C.. 3EK7 240-.C.. 3EK7 360-.C..

30 160 3EK7 240-.C.. 3EK7 390-.C.. 3EK7 270-.C.. 3EK7 390-.C..

36 170 3EK7 270-.C.. 3EK7 450-.C.. 3EK7 330-.C.. 3EK7 450-.C..

38 200 3EK7 300-.C.. 3EK7 480-.C.. 3EK7 330-.C.. 3EK7 480-.C..

40.5 190 3EK7 330-.C.. 3EK7 510-.C.. 3EK7 360-.C.. 3EK7 510-.C..48.3 250 3EK7 390-.C.. 3EK7 600-.C.. 3EK7 420-.C.. 3EK7 600-.C..

52 250 3EK7 420-.C.. 3EK7 450-.C..

72.5 325 3EK7 570-.C..

over

ance

Housing

insulation

Specified

short-term

load SSL (Fdyn)

Specified

long-term

load SLL (Fstat)

Height

H 1)Weight

m]

Lightning impulse

withstand voltage1.2/50 s

[kV]

Power frequency

withstand voltage1 min., wet

[kV] [N] [N] [mm] [kg]

80 104 49 2940 2050 170 1.5

80 104 49 2940 2050 170 1.5

80 104 49 2940 2050 170 1.6

80 104 49 2940 2050 170 1.6

0 122 57 2500 1750 200 1.9

0 122 57 2500 1750 200 2.0

48 144 67 2080 1450 240 2.3

48 144 67 2080 1450 240 2.4

86 166 77 1850 1290 270 2.7

86 166 77 1850 1290 270 2.8

8 184 86 1660 1160 300 3.1

8 242 113 1250 870 400 3.9

8 242 113 1250 870 400 4.08 242 113 1250 870 400 4.1

8 242 113 1250 870 400 4.1

8 242 113 1250 870 400 4.2

8 242 113 1250 870 400 4.3

84 281 131 1060 740 470 4.9

84 281 131 1060 740 470 5.0

84 281 131 1060 740 470 5.0

84 281 131 1060 740 470 5.1

20 302 140 980 680 510 5.3

Table 3: Typical 3EK7 arresters for system voltages according to IEC 60099-4

1) Refer to figure 1 on page 8


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Selection and Main Data

3EK7 Arresters According to IEEE Std C 62.11

Table 5: ANSI temporary overvoltage

H eavy duty Riser pole

Maximum continuousoperating voltage

MCOV

29 kV 29 kV

Duty-cycle voltage 36 kV 36 kV

Short-circuit current0.2 s

20 kA 20 kA

Low-current,long-duration

250 A 250 A

Low-currentpressure relief

600 A 600 A

High-current,short-duration

100 kA 100 kA

Lightning impulseclassifying current

10 kA 10 kA

Energy absorptioncapability (thermal)

4.6 kJ/kVMCOV 4.6 kJ/kVMCOV

Maximum design

cantilever load-static(MDCL)2478 inch-lbf 2478 inch-lbf

Table 6: 3EK7 distribution arrester main data

3EK7 heavy duty

Duty-cycle

voltageMCOV

TOV Capability

w/o dutyArrester part number Protective Level Maximum discharge voltage

[kV] [kV]for 0.1s

[kV]FOW

[kV] cr

8/20 s1.5 kA[kV] cr

8/20 s3 kA

[kV] cr

8/20 s5 kA

[kV] cr

8/20 s10 kA[kV] cr

8/20 s20 kA[kV] cr

8/20 s40 kA[kV] cr

45/912[kV

3 2.55 4.3 3EK7 030 - 3 A B 4 10.5 8.1 8.5 8.8 9.5 10.9 12.6 6

6 5.10 8.5 3EK7 060 - 3 A B 4 21.6 16.7 17.4 18.2 19.6 22.5 26.1 149 7.65 12.8 3EK7 090 - 3 A B 4 30.9 23.9 25.0 26.1 28.1 32.3 37.4 20

10 8.40 14.0 3EK7 100 - 3 A B 4 32.3 25.0 26.2 27.3 29.4 33.8 39.1 21

12 10.2 17.0 3EK7 120 - 3 A C 4 41.0 31.7 33.2 34.7 37.3 42.9 49.6 27

15 12.7 21.2 3EK7 150 - 3 A D 4 51.3 39.6 41.5 43.3 46.6 53.6 62.0 34

18 15.3 25.6 3EK7 180 - 3 A D 4 61.5 47.5 49.8 52.0 55.9 64.3 74.3 40

21 17.0 28.4 3EK7 210 - 3 A E 4 67.3 52.0 54.5 56.9 61.2 70.4 81.4 44

24 19.5 32.6 3EK7 240 - 3 A F 4 77.6 59.9 62.7 65.6 70.5 81.1 93.8 51

27 22.0 36.7 3EK7 270 - 3 A F 4 87.7 67.7 70.9 74.1 79.7 91.7 106 58

30 24.4 40.7 3EK7 300 - 3 A H 4 96.6 74.6 78.1 81.7 87.8 101 117 64

33 27.5 45.9 3EK7 330 - 3 A H 4 108 83.6 87.6 91.5 98.4 113 131 71

36 29.0 48.4 3EK7 360 - 3 A H 4 119 92 96 100 108 124 144 78

3EK7 riser pole

Duty-cycle

voltageMCOV

TOV Capability

w/o dutyArrester part number Protective Level Maximum discharge voltage

[kV] [kV]for 0.1s

[kV]FOW

[kV] cr

8/20 s1.5 kA[kV] cr

8/20 s3 kA

[kV] cr

8/20 s5 kA

[kV] cr

8/20 s10 kA[kV] cr

8/20 s20 kA[kV] cr

8/20 s40 kA[kV] cr

45/912[kV

3 2.55 3.8 3EK7 030 - 4 A B 4 8.9 6.8 7.1 7.4 8.0 9.2 10.6 5

6 5.10 7.6 3EK7 060 - 4 A B 4 17.7 13.6 14.2 14.8 15.9 18.3 21.2 11

9 7.65 11.4 3EK7 090 - 4 A B 4 26.4 20.3 21.3 22.2 23.9 27.5 31.8 17

10 8.40 12.5 3EK7 100 - 4 A C 4 29.3 22.6 23.7 24.7 26.6 30.6 35.4 19

12 10.2 15.1 3EK7 120 - 4 A D 4 35.2 27.1 28.4 29.7 31.9 36.7 42.4 23

15 12.7 18.9 3EK7 150 - 4 A D 4 43.9 33.9 35.5 37.1 39.9 45.9 53.0 29

18 15.3 22.7 3EK7 180 - 4 A E 4 52.7 40.7 42.6 44.5 47.8 55.0 63.6 34

21 17.0 25.2 3EK7 210 - 4 A F 4 61.5 47.4 49.7 51.9 55.8 64.2 74.2 40

24 19.5 29.0 3EK7 240 - 4 A H 4 70.2 54.2 56.8 59.3 63.8 73.4 84.8 46

27 22.0 32.7 3EK7 270 - 4 A H 4 79.1 61.0 63.9 66.7 71.8 82.5 95.4 52

30 24.4 36.2 3EK7 300 - 4 A H 4 87.7 67.8 71.0 74.2 79.7 91.7 106 58

33 27.5 40.8 3EK7 330 - 4 A J 4 96.6 74.6 78.1 81.6 87.7 101 117 64

36 29.0 43.1 3EK7 360 - 4 A K 4 105 81.3 85.2 89.0 95.7 110 127 69

Voltage per unit MCOV

1.7

1.6

1.5

1.4

1.3

1.2

1.1

0.01 0.1 1 10

1.8

1.0

Time inseconds

Preheating to 140F/60C

no prior duty heavy duty riser pole

100 1000 10000


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Drawings and Accessories

Figure 4: DIN insulating bracket for Ur 15 kVOrder code P22; 0.85 kg

Figure 5: DIN insulating bracket for Ur 36 kVOrder code P22; 1.0 kg

Figure 2: NEMA insulating bracket for Ur 15 kVOrder code P12; 0.35 kg

Figure 3: NEMA insulating bracket for Ur 36 kVOrder code P12; 0.5 kg

Figure 1: 3EK7 surge arrester main dimensions* please see tables on page 5 or 7

104

104

156

197

12 12

15

17

26

60

54

8 8

200

15

14

.5

14

.5

17

26

60

54

241

M12

M12

36

36

H

*

64

41

38.5

108

154

20

104

31

.5

94

14

.2

18

.2

74

12.5

14

64

41

38.5

152

198

20

104

31

.5 1

4.2

74

18

.2

94

12.5

14


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Figure 8: L-bracketOrder code M12; 0.1 kg

Figure 9: DIN metal bracket (hot dip galvanised)Order code P21; 0.6 kg

Figure 10: Insulated ground lead/Insulated line leadOrder code R51; 0.09 kg, 16 mm2

Figure 11: NEMA metal bracket (hot dip galvanized)Order code P11; 0.6 kg

Figure 12: Transformer bracket 8.7"Order code Q11; 0.6 kg

Figure 13:Transformer bracket 11"Order code Q12; 0.7 kg

Figure 7: Bird protection capOrder code M81; 50 g

Figure 6: DisconnectorOrder code P31; 0.1 kg

SW14(width across flats 9/16")

M12 or 3/8"

21

.5

14 or 10.2 14

25

50

152202

14

18

78

25

178280 (11")

41 64

57

14

.3

20

434320 40

13 1

3

450

145 14

221 (8.7")

18

78

2541 64

57

14

.3

20

434320

40

13

16

75

20

40

13

13

33

14

8

14

.512

26

30

60

15197

152

30

15

24

.5

75

57


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Drawings and Accessories

Figure 14: Transformer bracket 12.25"Order code Q13; 0.8 kg

Figure 15:Transformer bracket 14.5"Order code Q14; 0.8 kg

Figure 16: NEMA X-arm bracketOrder code Q51; 1.3 kg

Figure 18: Line clampOrder code M11 or M13; 0.1 kg

Figure 19: Stainless steel capOrder code M71; 5 g

Figure 17: Mounting plate, 37 mm heightOrder code Q81; 1.6 kg

220

198

10

.5

150

730120

178

310 (12.25")

18

78

25

14

41 63

57

14

.3

434320

40

327368 (14.5")

18

76

35

14

46

69

14

.3

19

40

86 64 86

54

55 40 40 55

254

14

227

200

142

253.5

3x1

20

cable 8 14

cable 14 18

66

71

18

1815

.2

12

.5

4

45

M13M11

8 18

86

8 18

92


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Order information

Figure 22: 3EK7 surge arresterwith accessories P12, P31, P52 and Q11

Figure 20: 3EK7 surge arrester withaccessories P12 and P31

Figure 21: 3EK7 surge arrester withaccessories P12, P31 and Q51

Part number 3 E K 7 300 4 C F 4 Z R51 M81 P12 P31

Medium voltage surge arrester 3 E K 7

Rated voltage in kV x 10 300

Classification

Distribution class, heavy duty (IEEE) 3

Nominal discharge current In= 10 kA (IEC)

or distribution class, riser pole (IEEE)4

Standard

IEEE Std C 62.11 with imperial-thread terminals A

IEEE Std C 62.11 with metric-thread terminals B

IEC - 60099-4 with metric-thread terminals C

Housing size, creepage distance

170 mm B

200 mm C

240 mm D

270 mm E300 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 M12

Line clamp M13 M13

Line lead, insulated, 455 mm/18 inch, 16 mm2 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 mm2 R51

Mounting auxiliaries

Transformer bracket (8.7 inch) Q11

Transformer bracket (11 inch) Q12



X-arm bracket Q51

Mounting plate for 200 mm and 10 inch bolt circle Q81

*Other additional parts on request, not all combinations are possible

Standard accessories at

high-voltage terminal: M12 or 3/8 inch stud, standard clamp,washer and nut

earthing terminal: M12 or 3/8 inch stud, washer and nut

Outline drawings for common design

options are shown in figure 20, 21 and 22


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Published by and copyright 2011:

Siemens AGEnergy SectorFreyeslebenstrasse 191058 Erlangen, Germany

Siemens AG

Energy SectorPower Transmission DivisionHigh Voltage ProductsNonnendammallee 10413629 Berlin, Germany

www.siemens.com/energy/arrester

Please contact us at:Phone: +49 30 386 33 222Fax: +49 30 386 26 721E-mail: [email protected]

Power Transmission DivisionOrder No. E50001-G630-A110-V2-4A00 | Printed in Germany |Dispo 30002 | c4bs No. 7457 |TH 263-110140 | W | 472573 | WS | 11111.0

Printed on elementary chlorine-free bleached paper.

All rights reserved.

Trademarks mentioned in this documentare the property of Siemens AG, its affiliates,or their respective owners.

Subject to change without prior notice.The information in this document contains generaldescriptions of the technical options available, whichmay not apply in all cases. The required technicaloptions should therefore be specified in the contract.

3ek7 iec ansi en

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