Description
For more than 30 years, Powercap Electric have provided exemplary service to our valued customers in the Electrical and Electronics industry. Throughout the years, we have supported customers across the globe and presently focus more on the regions of Asia and Oceania. Furthermore, we deliver solutions and services for the products as the exclusive agent working with the auspices of the Siemens Group which has been the centre of excellence force with a ca. 170 years of foundational growth since 1847.
Surge arresters protect electrical equipment from overvoltages caused by incoming surges. Overvoltages can be caused by direct or indirect lightning strikes, electromagnetic pulses, electrostatic discharges, or device switching. Some overvoltages are very powerful. The surge current is diverted through the arrester, usually to earth. Depending on the application, different surge arrester types are needed for effective overvoltage protection.
Medium-Voltage Surge Arrester
Distribution systems
Siemens Energy’s 3EK distribution class surge arrester product family is ideally suited for the reliable protection of transformers, circuit breakers, medium-voltage switchgear/panels and distribution lines.
Surge arresters with high energy discharge capability
Siemens Energy offers the 3EJ Cage Design™ surge arrester product family with higher energy discharge capabilities and a low protection level. Surge arresters protect rotating devices, like generators and motors, arc furnaces, arc furnace transformers and airfield-lighting systems.
Special applications
For the overvoltage protection of generators and motors, which require a very high short-circuit current capability, Siemens Energy offers the 3EP-G porcelain housed surge arresters with short-circuit current capability up to 300 kA.
3EK Distribution class surge arresters with silicone rubber housing
A disconnector is a device that separates the arrester from the system after an overloading. Siemens Energy’s innovative cage design ensures outstanding performance in safety issues. Metal oxide resistors are enclosed by a cage made of fibre-reinforced plastic (FRP) rods for high mechanical strength.
Siemens Energy offers two product lines for the application in distribution networks:
• 3EK7 – for rated voltages up to 60 kV, very high mechanical performance.
• 3EK8 – for rated voltages up to 36 kV
3EK8 silicone surge arresters with wrap design
Siemens Energy 3EK8 silicone rubber surge arresters with wrap design effectively protect medium-voltage distribution networks from overvoltage.
Siemens Energy 3EK8 wrap design surge arresters are ideally suited to provide reliable protection for:
- Transformers
- Circuit breakers
- Medium-voltage switchgear
- Medium-voltage distribution networks
Silicone is highly fire-retardant and self-extinguishing in the event of a fire. These properties ensure the reliable, maintenance-free operation of 3EK8 surge arresters. High-temperature vulcanized (HTV) silicone rubber is highly hydrophobic.
3EK8 surge arresters can be delivered with the same accessories as 3EK7 surge arresters.
3EK7 silicone rubber surge arresters with Cage Design™
Siemens Energy 3EK7 silicone rubber surge arresters with cage design effectively protect medium-voltage distribution networks from overvoltage.
They are ideally suited to provide reliable protection for:
- Transformers
- Circuit breakers
- Medium-voltage switchgear
- Medium-voltage distribution networks
Siemens Energy offers 3EK7 surge arresters for use in distribution networks for rated voltages up to 60 kV. Surge arresters are also available for indoor use. The cage, made of fibreglass-reinforced plastic (FRP) rods, provides a rigid, reinforced structure.
3EH4 medium-voltage surge arresters for distribution networks
Rugged design for high power and a long life
The 3EH4 medium-voltage surge arrester protects personnel by means of a grounded, corrosion-resistant aluminium housing. It is available in connector sizes 2 and 3 and is dimensioned to EN 50180 / EN 50181 for the inner cone system.
Development according to standards
The 3EH4 surge arrester complies with the IEC 60099-4 standard. The connector system was dimensioned according to the EN 50180 and EN 50181 standards. Type tests were performed in independent, PEHLA-accredited laboratories; the reports are available on request from your Siemens Energy contact.
3EJ Surge arresters with high energy discharge capabilities
Silicone rubber is highly hydrophobic and maintains its ability to repel water and any deposits of pollution throughout its entire service life. The silicone rubber housing is self-extinguishing and flame-retardant. Siemens Energy’s innovative cage design ensures outstanding performance in safety issues.
Siemens Energy offers five product lines for the application with high energy discharge, which differentiate in the protection level:
• 3EJ2 – for rated voltages up to 54 kV, medium energy discharge capability.
• 3EJ3 – for rated voltages up to 54 kV, high energy discharge capability.
• 3EJ4 – for rated voltages up to 54 kV, very high energy discharge capability.
• 3EJ0 – for rated voltages up to 15 kV, very low protection levels for protection against switching overvoltages.
• 3EJ9 – for rated voltages up to 12 kV, very low protection levels for protection against switching overvoltages.
3EP-G Porcelain surge arresters
The Siemens Energy 3EP porcelain surge arresters feature a specially developed directional pressure relief system. The metal oxide blocks are enclosed in a rigid, reinforced structure made of fibreglass-reinforced plastic rods. The excellent sealing system on the 3EP-G surge arrester effectively prevents moisture ingress and partial discharges.
Siemens Energy type 3EP-G porcelain surge arresters are ideally suited for the reliable protection of:
- Generators
- Motors
- Arc furnaces
- Dry-type transformers
- Airfield lighting systems
- Cable sheathing
- Capacitors and capacitor banks
- Converters for drives
More Detailed Information: Medium-Voltage Surge Arrester
