3EQ Surge Arresters
with silicone insulation
For replacing your post insulators
Answers for energy.
The cost-saving solution for your substation
Because the 3EQ surge arrester is virtually indestructible,
even with a sudden pressure drop, you need fewer post insulators,
thereby saving you both money and space.
Diagram of substation prior to 3EQ modification
Transformer
Surge Arrester
Voltage
Transformer
Post
insulator
GIS
bushing
Post
insulator
Street
Reduce the required space
even more
It‘s no problem to install our 3EQ surge
arrester above the transformer! There’s
no danger to equipment, even in the
immediate vicinity.
Diagram of substation with integrated 3EQ modification
Transformer
3EQ as
post insulator
GIS
Voltage
Transformer bushing
Post
insulator
Street
Saved installment space
The 3EQ surge arrester – our choice for
reliability, wear resistance, and savings
Do you require high bending moments
for the support?
The stability and ruggedness of the 3EQ surge arrester is enviable.
The tubular shape provides very high resistance to mechanical
loads and allows high bending moments to be handled well, while
its silicone insulation is an ideal solution for many years of use.
Whatever the outside conditions, our 3EQ surge arresters are
100 % explosion-proof, even in the unlikely event of an overload.
They are virtually indestructible, and even after a pressure drop
they retain at least 75 % of their mechanical strength. The 3EQ
surge arrester has maximum stability under any conditions,
including in areas of elevated seismic activity.
The right 3EQ surge arrester, featuring its tubular design,
can always be found for any of your needs!
6000 Nm (for voltages of 30 kV to 362 kV)
38,000 Nm (for voltages of 110 kV to 550 kV)
72,000 Nm (for voltages of 220 kV to 800 kV)
Silicone insulation ribs
Glass-plastic rods
Metal oxide varistors
Nitrogen
FRP tube
Tubular-design surge arrester
with silicone 3EQ-type insulation,
a product of Siemens:
A glass fiber tube provides
exceptionally high mechanical
strength.
After 80 kA short-circuit-test
Surge Arrester 3EQ3
before test
Type 3EQ silicone surge arresters
in tube design by Siemens
3EQ as
post insulator
Voltage tranformer
Foundation, steel
structure, post
insulators, clamps,
rental fees for
cranes
$ 1000 US
$ 8000 US
Labor costs
Assembly of steel
structure and post
insulators
$ 1500 US
$ 12,000 US
Building site
Construction area
Depends on cost of land
Transformer
Clearance between equipment according to technical standards
Grid with
Um = 362 kV
Materials
GIS
bushing
Street
Grid with
Um = 126 kV
Minimum savings
(approximate)
$ 2500 US
$ 20,000 US
Siemens Power Transmission
and Distribution Inc.
Arrester Products
444 Highway 49 S.
Richland, MS 39218
Phone 601-932-9800
Fax
601-932-9911
Order No. E50001-U113-A291-V2-US00
Printed in Germany
TH 263-080297 103133 PA 04080.3
www.usa.siemens.com/energy
www.usa.siemens.com/arresters-download
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.