3ek7 iec ansi en
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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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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
Transformer bracket (12.25 inch) Q13
Transformer bracket (14.5 inch) Q14
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: arrester.energy@siemens.com
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.
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