High-voltage surge arresters
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High-voltage surge arresters Product guide siemens.com/energy/arrester

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...

Contents Definition of surge arresters

Siemens surge arresters for any requirement Experience is most essential when it comes to reliability in medium- and high-voltage applications. Siemens 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 know-how, and comprehensive worldwide experience give Siemens surge arresters a leading edge in overvoltage protection. Their uncompromising quality ensures a long service life and reliability in any application. Siemens surge arresters are an indispensable...

Always the best solution Developments in technology and practical experience have led to three different surge arrester designs: ◾◾ urge arresters with porcelain housings S ◾◾ urge arresters with silicone housings S ◾◾ urge arresters with metal enclosures S Siemens 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 ◾◾ igh mechanical stability for outstanding seismic safety H ◾◾ xtremely reliable pressure relief behavior for use in E areas requiring special...

1925 Siemens begins developing surge arresters. The first devices are of the so-called cathode drop type. 1847 The ten-employee company Telegraphen-Bauanstalt von Siemens & Halske (Telegraph Construction Company of Siemens & Halske) begins operation on October 12, 1847, in a back building in Berlin. 1971 Development of the first gas-insulated and metal-encapsulated surge arrester for gas-insulated switch-geai "SIS'. 1989 The 3EQ2 surge arrester for systems of up to 550 kV is one of the first high-voltage surge arresters with composite polymer hollow core housing. 1982 Siemens' first gapless...

1998 The polymer-housed medium-voltage/distribution class arresters of the 3EK family, which features Cage Design™, a unique solution with direct silicone molding on the metal oxide varistors, is introduced. 2003 Completion of the first line arrester project, an order from KELAG, one of the leading energy service providers in Austria. 2007 3EL2, the first line arrester for 550 kV applications, is delivered to Sochi, a city in Russia. 2011 Siemens introduces its new range of long rod insulators. 2006 Development of the 3EQ5, a new surge arrester concept with composite housing (type A) for...

MOVs: the core of Siemens surge arresters 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 suitable for this use. The nonlinearity of MO resistors is considerably high, which is why MO arresters do not need series gaps....

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 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. Siemens silicone rubber-housed surge arresters are polymer-housed arresters that use silicone rubber as the only...

Siemens 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 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, which is quite common in the insulator...

Siemens 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

Design features Silicone rubber sheds directly molded on metal oxide blocks and on end fittings Siemens' 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 discharge or moisture ingress. The MO blocks of 3EL surge arresters are enclosed by a cage...

Low weight: flexible and easy installation The use of FRP and silicone as housing materials also makes Siemens 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. Applications The 3EL series of surge arresters covers a wide range of common installation requirements including station and line surge arresters for the protection of switchgear, transformers, and other equipment in high-voltage systems of up to 550...