High-voltage surge arresters Product guide

Definition of surge arresters Surge arresters are used to protect high-voltage equipment in substations, such as transformers, circuit breakers, and bushings, against the effects of overvoltages caused by incoming surges. Such overvoltages can be caused by a direct or nearby lightning strike, an electromagnetic pulse, electrostatic discharge, or switching operations in the power supply system as well as in devices. Some overvoltages are very high in energy. The current from the surge is diverted through the arrester, in most cases to earth. Effective overvoltage protection requires different...

High-voltage surge arresters I Contents Definition of surge arresters Siemens Energy surge arresters for any requirement Always the best solution MOVs: the core of Siemens Energy surge arresters Silicone rubber High-voltage station class surge arresters 3EL silicone rubber surge arresters with Cage Design™ 3EQ silicone rubber surge arresters with composite hollow core design 3EP porcelain surge arresters Standards and testing - reliability you can count on Selection table and how to select a suitable surge arrester Applications as line surge arresters Early detection of relevant changes through...

High-voltage surge arresters I Introduction Substation Bidingen 400 kV Protection of transformer solution with 3EQ4 Siemens Energy surge arresters for any requirement

Experience is most essential when it comes to reliability in medium- and high-voltage applications. Siemens Energy has been designing and manufacturing medium- and high-voltage surge arresters for standard and special applications since 1925. Continuous research and development, the wealth of Siemens Energy know-how, and comprehensive worldwide experience give Siemens Energy surge arresters a leading edge in overvoltage protection. Their uncompromising quality ensures a long service life and reliability in any application. Siemens Energy surge arresters have been designed to meet the requirements...

Substation Bidingen 400 kV Protection of switchgear solution with 3EQ4

High-voltage surge arresters I Introduction Always thebest solution ■ Developments in technology and practical experience have led to three different surge arrester designs: • Surge arresters with porcelain housings • Surge arresters with silicone housings • Surge arresters with metal enclosures Siemens Energy provides each of these types in several versions, making it possible to find the optimal surge arrester for every conceivable application and meet even specific demands, such as High mechanical stability for outstanding seismic safety • Extremely reliable pressure relief behavior for use...

High-voltage surge arresters I MOVs MOVs: the core of Siemens Energy surge arresters p.u. Ur IEC power-frequency voltage vs. time (U-t) characteristic (TOV) Preheating to 60°C prior duty The main task of an arrester is to protect equipment from the effects of overvoltages. During normal operation, an arrester should have no negative effect on the power system. Moreover, the arrester must be able to withstand typical surges without incurring any damage. Nonlinear resistors fulfill these requirements thanks to the following properties: Nonlinear resistors made of metal oxide (MO) have proven especially...

High-voltage surge arresters I Silicone rubber Characteristic damage on EPDM insulators due to natural UV radiation As a pioneer in the field of silicone rubber insulation and one of the few suppliers with comprehensive in-house research and development capabilities in this technology, Siemens Energy has been providing surge arresters with silicone rubber housing for more than 25 years and has gathered excellent service experience from even the most severe climatic and environmental conditions. Today, silicone rubber is among the most widely used materials for high-voltage outdoor equipment....

High-voltage surge arresters I Porcelain Siemens Energy porcelain surge arresters feature a directional pressure relief device that ensures maximum protection in the case of an overload. Thanks to the excellent sealing of its surge arresters, Siemens Energy has recorded decades of trouble-free service life without failures or moisture ingress. Both ends of a porcelain surge arrester housing are equipped with aluminum flanges that are cemented to the housing. Sulfur cement is the first choice for this purpose. It has favorable mechanical properties and also proves advantageous over Portland cement,...

High-voltage surge arresters I Station class surge arresters Siemens Energy provides three surge arrester product families for standard and special AC applications from 3 kV up to 800 kV, which are described in this brochure: • 3EL surge arresters with silicone housing, Cage Design™ • 3EQ surge arresters with silicone housing, composite hollow core design • 3EP surge arresters with porcelain housing

High-voltage surge arresters I 3EL 3EL silicone rubber surge arresters with Cage DesignTM Metal oxide blocks Silicone rubber sheds directly molded on metal oxide blocks and on end fittings Siemens Energy’s cage design ensures high mechanical strength and safe overload performance. It is characterized by the use of silicone and fiberglass-reinforced plastic (FRP) rods as housing materials. Reliability is guaranteed by the direct molding of the silicone rubber onto the MO blocks and the FRP rods. This ensures the total embedding of all components free of bubbles and gaps, thus preventing any partial...

High-voltage surge arresters I 3EL Low weight: flexible and easy installation The use of FRP and silicone as housing materials also makes Siemens Energy 3EL arresters extremely lightweight, allowing easy transport and flexible installation. The use of 3EL surge arresters helps reduce the required strength and weight of arrester supports and the need for heavy installation equipment. up to 550 kV. 3EL surge arresters can be installed at all mounting angles (e.g. horizontally, vertically, or suspended from the transmission line as line surge arrester). Mechanically strong enough to meet common...