Siemens 3EQ User Manual
3EQ Composite Housed
Surge Arresters
Saving Money and Space, Gaining Reliability
Power Transmission and Distribution
1
A perfect Combination of
Cost-Savings, Safety and Reliability
3EQ Surge Arresters:
Your Reliable, Sturdy and Economic Choice
3EQ surge arresters are virtually indestructible. While their tube
design provides the highest possible mechanical strength and
enables them to support high bending moments, the silicone
rubber insulation is ideal for outdoor applications in severe
environmental conditions. No matter how tough the environmental or operating conditions may be, our 3EQ arresters
assures a 100 % reliable pressure relief performance, they provide the ultimate in protection. They are break-proof and retain
at least 75 % of their mechanical strength even after pressure
relief. They provide the greatest stability, even in earthquakes.
Reduced Space Requirements
Their advantages are more than convincing, a perfect combination of cost-savings and safety for your substations. The
combination of silicone rubber and fiber-glass-reinforced tube
imparts enormous load carrying capacity to the structure. Thus,
our 3EQ surge arresters are the perfect choice to replace existing post insulators in your substations up to voltages of 800 kV.
Where space is most essential, 3EQ surge arresters can even be
mounted over the transformer to support connectors without
any danger to neighboring equipment. This assures maximum
stability, even if the arresters should “blow out” after overloading. Pressure relief is absolutely reliable – there is no danger
to equipments in the direct vicinity. Due to their unique tube
design, no parts will be expelled, and the emerging arc will
burn between the ends of the pressure relief device.
Longevity and Reliability
The 3EQ’s Silicone Rubber housings provide the best possible
long-life-performance for high-voltage surge arresters. They
make use of all the advantages of bonding vulcanized-on
silicone rubber sheds to a fiberglass-reinforced plastic tube,
providing enhanced safety and meeting every requirement.
And, with their silicone rubber housings, the arresters enjoy
all-round protection. The silicone rubber shield provides a reliable defense against snow, sandstorms, ozone, high-level UV
radiation, sea salt, soot and acid rain in industrial regions. Only
genuine silicone rubber is capable of maintaining its hydrophobic properties throughout its entire service life – and is resistant
to UV radiation. The silicone rubber of the 3EQ surge arresters
reliably prevents the formation of films of water or dirt. Surface
currents resulting from conductive layers of accumulated dirt
are eliminated.
The cost-saving solution for your substation
You require fewer post insulators for your installation,
thereby saving you both money and space.
Transformer
Surge
Support Support
arreser
Street
Voltage
transformer
GIS bushing
Saved installment space
Transformer 3EQ as support
Street
Support
Voltage
transformer
GIS bushing
Diagram of substation prior to 3EQ modification
2
Diagram of substation with integrated 3EQ modification
A lot more speaks for the efficiency of 3EQ
Their dramatically reduced weight means savings right
from the start – in transportation, in support structures
and in installation. The weight reduction in our polymeric
arresters compared with porcelain types is amazing.
In fact, highvoltage arresters with composite housings are
about 50 % lighter than their porcelain counterparts. This
makes all the difference: Initially in terms of transportation
costs. Then there is installation and commissioning –
involving reduced labor costs, less complex support structures and simple hoisting gear. The cranes required can be
significantly smaller – and the cost using them correspondingly lower. And there‘s another way in which they save
costs – polymeric arresters don‘t need cleaning. By virtue
of its hydrophobic properties, everything is so much simpler with silicone rubber throughout its entire service life.
They provide numerous advantages – a gain for everyone,
thanks to Siemens know-how for innovations and unsurpassed quality of manufacture.
All 3EQ advantages at a glance are
Maximized service life
100 % break-proof – reliable overload performance,
no hazardous splinters even under maximum pressure:
these arresters can even be installed in close proximity
to costly system components
Safe from damage – unbreakable during transportation,
installation, storms, earthquakes and immune to vandalism
Outstanding stability in earthquake and storm:
these arresters can be used to replace post insulators
Use of silicone rubber – hydrophobic, resistant to pollution
and to UV radiation
Extremely rugged – reliable in any climate and
polluted environment
Substantially reduced weight – ease of installation with
simple lifting gear
Complete and wide product range, special versions to order
Cost-effective in all respects – maximum availability –
for many special application and installation needs
Reduce the required space even more
It‘s no problem to install our 3EQ surge arrester on top
of the transformer! There is no danger to equipment,
even in the direct vicinity.
3EQ as support Voltage
Transformer
Street
transformer
GIS bushing
Sealing
system
Directional pressure
relief device
Nitrogen
FRP rods
Metal oxide
blocks
Glass fibre
reinforced tube
Silicone
rubber housing
Clearance between equipment according to technical standards
3
Diagram 1
Choose the Appropriate Arrester
In just four steps you can choose the right surge arrester:
1. First step choose the type 3EQ1, 3EQ4 or 3EQ3
from diagram 1.
2. Second step verify the maximum technical data
with table 1.
3. Third step choose the surge arrester with table 2.
4. Fourth step select the suitable installation and
grounding and complete the order number with table 3.
Table 2
Highest voltage
for equipment
U
m
[kV]
72.5 325 54 43 2 500 133 143 160 110 114 120 3EQ1 054 – 1 P B 2 1 –
Neutral-ground arresters
Um [kV]
72.5
123 450 96 77 2 500 237 254 285 196 204 214 3EQ1 096 – 1 P J 2 1 –
Neutral-ground arresters
Um [kV]
123
Resonant earthed
145 550 111 89 2 500 274 294 329 227 235 247 3EQ1 111 – 1 P J 2 1 –
Neutral-ground arresters
Um [kV]
145
170 650 138 110 2 500 340 366 410 282 293 307 3EQ1 138 – 1 P P 2 1 –
Neutral-ground arresters
Um [kV]
170
1) According to IEC 60099-4 these values are measured on individual housing units
4
Standard
lightning
impulse
withstand
voltage
Rated
voltage
Continuous
operating
voltage
Line
discharge
class
Long
duration
current
2 ms
BIL min
[kV]
[kV]
U
r
U
c
[kV] LD-Cl [A]
325 54 43 3 850 122 130 144 104 106 111 3EQ1 054 – 2 P B 3 1 –
325 60 48 2 500 148 159 178 122 127 134 3EQ1 055 – 1 P B 2 1 –
325 60 48 2 850 130 138 153 110 113 119 3EQ1 056 – 2 P B 2 1 –
325 60 48 3 850 135 144 160 115 118 124 3EQ1 060 – 2 P B 3 1 –
325 66 53 2 500 163 175 196 135 140 147 3EQ1 066 – 1 P B 2 1 –
325 66 53 2 850 143 152 168 121 124 131 3EQ1 066 – 2 P B 2 1 –
325 66 53 3 850 149 158 176 127 130 136 3EQ1 066 – 2 P B 3 1 –
325 72 58 2 500 177 191 214 147 153 160 3EQ1 072 – 1 P B 2 1 –
325 72 58 3 850 162 173 192 138 142 149 3EQ1 072 – 2 P B 3 1 –
325
325
30 24 2 500 74.0 79.5 89.0 61.2 63.6 66.8 3EQ1 030 – 1 S B 2 1 –
30 24 3 850 67.7 72.0 79.9 57.6 59.0 61.9 3EQ1 030 – 2 S B 3 1 –
450 96 77 2 850 208 221 245 177 181 190 3EQ1 096 – 2 P J 2 1 –
450 96 77 3 850 217 230 256 184 189 198 3EQ1 096 – 2 P J 3 1 –
450 102 82 2 500 251 270 303 208 216 227 3EQ1 102 – 1 P J 2 1 –
450 102 82 3 850 230 245 272 196 201 211 3EQ1 102 – 2 P J 3 1 –
450 108 86 2 500 266 286 321 220 229 240 3EQ1 108 – 1 P J 2 1 –
450 108 86 3 850 244 259 288 207 213 223 3EQ1 108 – 2 P P 3 1 –
450 111 89 3 850 250 266 296 213 218 229 3EQ1 111 – 2 P P 3 1 –
450 51 41 2 500 126 135 151 104 108 114 3EQ1 051 – 1 S B 2 1 –
550
550
90 72 2 850 195 207 230 166 170 178 3EQ1 090 – 2 S E 2 1 –
96 77 2 850 208 221 245 177 181 190 3EQ1 096 – 2 S J 2 1 –
550 111 89 2 850 240 255 283 204 209 220 3EQ1 111 – 2 P J 2 1 –
550 120 96 2 500 296 318 356 245 254 267 3EQ1 120 – 1 P P 2 1 –
550 120 96 3 850 271 288 320 230 236 248 3EQ1 120 – 2 P P 3 1 –
550 126 101 3 850 284 302 336 242 248 260 3EQ1 126 – 2 P P 3 1 –
550 132 106 3 850 298 317 352 253 260 272 3EQ1 132 – 2 P P 3 1 –
550 144 115 2 850 311 331 368 265 272 285 3EQ1 144 – 2 P P 2 1 –
550 144 115 3 850 325 346 384 276 283 297 3EQ1 144 – 2 P P 3 1 –
550
60 48 2 500 148 159 178 122 127 134 3EQ1 060 – 1 S B 2 1 –
650 138 110 2 850 298 317 352 254 260 273 3EQ1 138 – 2 P P 2 1 –
650 138 110 3 850 311 331 368 265 272 285 3EQ1 138 – 2 P P 3 1 –
650 144 115 2 500 355 382 427 294 305 321 3EQ1 144 – 1 P P 2 1 –
650 144 115 3 850 325 346 384 276 283 297 3EQ1 144 – 2 P P 3 1 –
650 144 115 3 850 325 346 384 276 283 297 3EQ1 144 – 2 P P 3 1 –
650 150 120 3 850 338 360 400 288 295 310 3EQ1 150 – 2 P P 3 1 –
650 69 55 2 500 170 183 205 141 146 154 3EQ1 069 – 1 S B 2 1 –
LD-class
Long duration current impulse Max. value/A
Bending Moment/kNm
72
42
Special
application
38
Special
21
application
6
Special
application
12 36 52 72 123 145 170 245 300 362 420 550
3 and 4
2 and 3
5000
4125
5
2750
2100
1600
1200
850
2
500
Maximum values of the residual voltages at
discharge currents of the following impulses
8/20 µs
5 kA
[kV]
8/20 µs
10 kA
[kV]
8/20 µs
20 kA
[kV]
30/60 µs
0.5 kA
[kV]
30/60 µs
1 kA
[kV]
30/60 µs
2 kA
[kV]
3EQ1
3EQ4
3EQ3
800
Arrester type
U
m
kV
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