Surge arresters

Overview

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 aid to insulation coordination in electrical power supply systems. Valuable equipment such as transformers, circuit breakers, generators, motors, capacitors, traction vehicles, and bushings, as well as complete switchgear, is ideally protected against lightning and switching overvoltages.Siemens provides a wide range of surge arrester product families for the protection of medium-voltage systems and components up to 72.5 kV. The selection of the surge arrester depends on the application to be protected:

Distribution systems

Siemens 3EK Cage Design™ distribution class surge arresters are ideally suited for the reliable protection of transformers, circuit breakers, medium-voltage switchgear / panels and distribution lines.

Surge arresters with high energy discharge capability

Next to the typical distribution class surge arresters, Siemens offers the 3EJ Cage Design™ surge arrester product family with higher energy discharge capabilities, providing a low protection level. The 3EJ surge arresters protect rotating devices, like generators and motors, arc furnaces, arc furnace transformers, industrial transformers, airfield-lighting systems, cable sheath, capacitors and capacitor banks and converters for drives.

Special applications

For applications requiring a surge arrester with silicone rubber housing in combination with a directional pressure relief device, Siemens offers the 3EQ0 product line.For the overvoltage protection of generators and motors, which require a very high short-circuit current capability, Siemens offers the 3EP-G porcelain housed surge arresters with short-circuit current capability up to 300 kA.

Internet homepage:

http://www.energy.siemens.com/hq/en/power-transmission/high-voltage-products/surge-arresters-limiters/medium-voltage-arresters.htm

Конфигурация

Surge arrester selection according to IEC 60099-4

The table below shows an overview of the typical minimum rated voltage U_r for the surge arrester, depending on the highest voltage U_s and grounding of the system according to IEC 60099-4.

Highest voltage of system	Solidly earthed neutral system	Isolated neutral system or delta winding	Impedance earthed neutral system	Resonant earthed neutral system
U_s [kV]	U_r [kV]	U_r [kV]	U_r [kV]	U_r [kV]
3.6	3	6	3	6
7.2	6	9	9	9
12	9	15	12	15
17.5	15	24	15	24
24	18	30	21	30
36	27	45	33	45
52	39	66¹⁾	45	66¹⁾
72.5	54	96¹⁾	66¹⁾	96¹⁾

¹⁾ High-voltage surge arrester

Surge arrester selection according to IEEE C62.11

The table below shows an overview of the typical minimum duty cycle voltage U_r for the surge arrester, depending on the highest line to line voltage U_s and grounding of the system according to IEEE C62.11.

System L-L voltage	Four-wire multi-grounded neutral wye	Three-wire low impedance neutral circuit	Three-wire high impedance neutral circuit
U_s [kV]	U_r [kV]	U_r [kV]	U_r [kV]
4.16	3	6	6
6.9	-	-	9
8.3	6	9	-
12	9	12	-
12.47	9 or 10	15	-
13.8	10 or 12	15	18
22.86	15	21	-
23	-	-	30
34.5	27	36	-

Дальнейшая информация

Standards and testing

Tests

Siemens surge arresters have been designed and tested in compliance with the latest IEC 60099-4, IEEE C62.11, and GB 11032 standards. All type tests are performed by independent, PEHLA- certified laboratories; reports are avail- able on request. Please contact your Siemens representative for details.Moreover, every single surge arrester that leaves the Siemens factory undergoes a routine test and is delivered with a routine test certificate.

Quality assurance

Siemens meets all requirements of ISO 9001:2008, ISO 14002:2004, and BS OHSAS 18001:2007. All Siemens suppliers need to be certified according to ISO standards or will be audited by Siemens.To maintain sustainable quality improvement, Siemens introduced corporate quality guidelines that contribute to each step of the quality process.

Standardization

The aim of the IEC’s Technical Committee 37 (TC 37) as well as the IEEE’s Surge Protective Device Committee (SPDC) is the standardization of surge arrester testing and application. The TC 37 develops the standards IEC 60099-4, IEC 60099-8 (EGLA), IEC 60099-9 (HVDC), and the application guide IEC 60099-5, while the SPDC develops the standard IEEE C62.11 and the application guide IEEE C62.22. Both committees include representatives of manufacturers, utilities, test field labs, and universities.Siemens R&D experts are members of both bodies, thus playing an important role in the definition of the standards. They also share their expert knowledge in electrical power systems in CIGRE, the international council on large electric systems, which participates in the development of international standards.