High-voltage station arresters

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We offer an extensive portfolio of high-voltage station arresters in several versions for every conceivable application and even specific demands. Our surge arresters protect devices in equipment for applications up to 1200 kV.

 

 

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Product overview

Overview of our high-voltage station arresters

Our portfolio consists of three types of surge arresters for specific applications:
 

3EL product family – Surge arresters with directly molded silicone rubber housing, Cage Design®
3EQ product family –
Surge arresters with silicone housing, composite hollow core design
3EP product family 
– Surge arresters with porcelain housing

Main features:

  • High mechanical stability for support applications and for use in regions with high seismic activity
  • Extremely reliable pressure relief for use in areas requiring special protection
  • Excellent pollution layer characteristics for use in coastal and desert regions or in areas with extreme air pollution
  • All three surge arrester product families feature a superior sealing system that reliably prevents moisture ingress
  • Decades of trouble-free service
  • Manufactured using only environmentally compatible materials
 

 

Our product families

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3EL – Surge arresters with directly molded silicone rubber housing, Cage Design®

Siemens 3EL silicone rubber surge arresters with Cage Design® provide outstanding protection against overvoltages in networks up to 800 kV.

 

Siemens 3 EL Cage Design® surge arresters are ideally suited for the reliable protection of:
- Transformers
- Circuit breakers
- Generators
- Motors
- Capacitors
- Traction vehicles
- Bushings
- Switchgear
- Transmission lines

The cage, made of fiberglass-reinforced plastic (FRP) rods, provides a rigid, reinforced structure ensuring high mechanical strength. The silicone rubber housing is directly molded onto the metal oxide (MO) blocks and the surrounding cage made of FRP rods. This creates a reliable seal that prevents moisture ingress and partial discharges.

 

The MO resistors are not surrounded by a rigid mechanical coating, which is why no critical increases in pressure can occur in the surge arrester in the extremely rare event of an overload. The arc can escape directly through the soft silicone housing without damaging the mechanical structure. No internal parts are ejected in the process. The innovative Siemens Cage Design® is very secure.
 

The silicone rubber is highly hydrophobic and UV-resistant. This keeps any conductive moisture from forming on the surface, and dirt deposits are rendered harmless as a result of the hydrophobic transfer. Silicone is highly fire-retardant and self-extinguishing in the event of fire. These properties ensure the reliable, maintenance-free operation of 3EL surge arresters. They are also lightweight, allowing for easy transport and a variety of installation options. 3EL surge arresters are suitable for use as station or line surge arresters.

 
 

Technical data

Maximum values
 
3EL5
3EL1
3EL2
3EL3
Highest voltage of the system (kV)
  72.5 252 420 550
Maximum rated voltage (kV)
  60 198 360 444
Nominal discharge current (kA)
Thermal energy rating (kJ) / (kV) Charge transfer rating (C)        
10 4.5 1.0 X      
10 5.0 1.2   X    
10 6.0 1.6   X    
10 7.0 2.0     X  
20 9.0 2.4     X  
20 10.0 2.8       X
20 14.0 3.6       X
Rated short-circuit current (kA)
  20 65 65 65
High current impulse (kA)
  100 100 100 100
Specified short-term load SSL (kNm)
  0.5 1.2 4.0 10.0
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3EQ product family – surge arresters with silicone housing, composite hollow core design

Siemens 3EQ surge arresters with silicone housing and a composite hollow core design are ideally suited for the reliable protection of:

- Transformers
-
Circuit breakers
- Generators
- Motors
- Capacitors
- Bushings
- Switchgear


The surge arrester with the composite hollow core design uses silicone and fiberglass-reinforced plastic (FRP) as housing materials. The direct molding of the silicone onto the FRP hollow core ensures reliability, while an excellent special sealing of the flanges at both ends of the surge arrester effectively prevents partial discharges and moisture ingress. This guarantees decades of trouble-free operation.


The combination of silicone rubber and the fiberglass-reinforced hollow core also allows for outstanding mechanical stability.

The surge arrester with the composite hollow core design provides a very high degree of safety: In the event of an overload or the extremely rare case of an arrester short circuit, the arc escapes directly through directional pressure relief devices.

 

The surge arrester can be oriented to minimize the risk of damage to facilities and injuries to people nearby. Internal parts are not ejected, and the housing does not break.

 

3EQ surge arresters can be used as station or support insulators. They are ideally suited for areas with the heaviest seismic activity, extremely strong winds and in support functions.

 

Technical data

Maximum values
 
3EQ1
3EQ4
3EQ3
Highest voltage of the system (kV)   362 800 800
Maximum rated voltage (kV)   288 588 624
Nominal discharge current (kA)
Thermal energy rating (kJ) / (kV) Charge transfer rating(C)      
10 5.0 1.2 X    
10 7.0 2.0 X X  
20 10.0 2.8   X X
20 14.0 3.6   X X
20 18.0 6.0   X X
Rated short-circuit current (kA)
  40 65 1 80
High current impulse (kA)
  100 100 100
Specified short-term load SSL (kNm)
  6.0 21 / 38 2 42 / 72 2

1) Increased rated short-circuit current of 80 kA on request 2) Increased SSL available on request

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3EP – surge arresters with porcelain housing

Siemens 3EP porcelain surge arresters offer outstanding protection against overvoltages in networks of up to 800 kV.

 

3EP porcelain surge arresters are ideally suited for the reliable protection of:

- Transformers
- Circuit breakers
- Generators
- Motors
- Capacitors
- Bushings
- Switchgear


The cage, made of fiberglass-reinforced plastic (FRP) rods, provides a rigid, reinforced structure ensuring high mechanical strength.
 

The excellent sealing system prevents moisture ingress and partial discharges.
 

In the extremely rare event of an overload, the arc can escape directly through the directional pressure relief devices. Strong, high-quality porcelain prevents the ejection of internal parts. The Siemens porcelain design offers extremely safe overload performance.
 

3EP porcelain surge arresters are ideal for areas with heavy seismic activity and extremely strong winds.

 
 

Technical data

Maximum values
 
3EP5
3EP4
3EP6
3EP3
Highest voltage of the system (kV)   123 362 800 800
Maximum rated voltage (kV)   96 288 588 624
Nominal discharge current (kA)
Thermal energy rating (kJ) / (kV) Charge transfer rating (C)        
10 5.0 1.2 X X    
10 2.0 2.0 X X X  
20 2.8 2.8     X X
20 3.6 3.6     X X
20 6.0 6.0       X
Rated short-circuit current (kA)
  40 65 65 80
High current impulse (kA)
  100 100 100 100
Specified short-term load SSL (kNm)
  2.0 4.5 18 / 30 2 34 / 90 2

2. Increased SSL available on request

Downloads, support and services

Our services for you

You can find details on our high-voltage station arresters and information about our services here.

Please contact us if you have any questions or need assistance

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Testing laboratories at Schaltwerk Berlin

We test components at our accredited testing laboratories.

Testing laboratories at Schaltwerk Berlin
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Technical simulations

Numerical simulation and analytical calculation methods for efficient product development.

Technical simulations

Contact

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Do you have any questions about our high-voltage station arresters? Contact us. We are pleased to offer you individual advice.