Medium-voltage surge arresters. Product guide. Version Catalogue HG siemens.com/energy/arrester

Transcription

1 Medium- surge arresters Product guide Catalogue HG 31.1 Version 2017 siemens.com/energy/arrester

2 Medium- surge arresters Product guide Definition of surge arresters Surge arresters are used to protect electrical equipment, such as transformers, circuitbreakers, and bushings, against the effects of overs caused by incoming surges. Such overs 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 overs are very high in energy. The from the surge is diverted through the arrester, in most cases to earth. Effective over protection requires different surge arrester types to be used according to the particular application. 2

3 Contents Contents Definition of surge arresters 02 Portfolio Overview 04 History timeline 06 MOVs: the core of Siemens surge arresters 08 Standards and testing 09 How to select a suitable surge arrester 10 Typical s and selection data 14 3EK Distribution class surge arresters 3EJ Surge arresters with high energy discharge capabilities EQ0 Silicone rubber surge arresters with composite hollow core design 61 3EP-G Porcelain surge arresters for generator and motor protection 73 Glossary 78 3

4 Medium- surge arresters Product guide Siemens surge arresters for any requirement Experience is most essential when it comes to reliability in medium- and high- applications. Siemens has been designing and manufacturing medium- and high- surge arresters for standard and special applications since Continuous research and development, the wealth of Siemens know-how, and comprehensive worldwide experience give Siemens surge arresters a leading edge in over 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 optimally protected against lightning and switching overs. Siemens surge arresters have been designed to meet the requirements of a wide range of common installation conditions, from arctic cold to the heat of the desert and the dampness of tropical climates. They are available for any application from 3 up to 1,200 including special applications such as high- direct (HVDC) and FACTS systems as well as all kinds of compensation systems for electric power networks. High- surge arresters Siemens offers three different designs for high- station surge arresters for the protection of substation equipment for applications up to 1200 : 3EL product family - Surge arresters with directly moulded 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 Siemens provides each of these types in several versions, making it possible to find the optimal surge arrester for every conceivable application. For more information, refer to the product guide High surge arresters (IEC) resp. Station and intermediate class surge arresters (IEEE). SF 6 -insulated, metal-enclosed surge arresters Siemens provides gas-insulated, metal-enclosed surge arresters for standard and special AC and DC applications from 72.5 to 800. Siemens 3ES surge arresters are ideally suited for the reliable protection of gas-insulated switchgear (GIS), gas-insulated transmission lines (GIL), gas-insulated bus (GIB), and transformers in substations, power plants, and offshore wind power plants. For more information, refer to the product guide SF 6 -insulated, metal-enclosed surge arresters. Line surge arresters The use of surge arresters on hazardous stretches of a power line helps improve network protection and increases the reliability of the entire transmission system. Offering a highly efficient combination of low weight, outstanding strength, and safety features, Siemens surge arresters are idealy suited for this purpose. Siemens provides two solutions for line surge arresters: Non-gapped line arresters (NGLA) can either be installed directly on the insulators or on the tower, depending on the tower design and the arrangement of insulators and lines. Siemens 3EL surge arresters are ideally suited for this purpose. Externally gapped line arresters (EGLA) have an external spark gap placed in series that galvanically isolates the active part of the line surge arrester from the line under normal conditions. The series varistor units (SVU) of the EGLA 3EV product lines are based on the respective 3EL product lines. For more information, refer to the brochure Line surge arresters for increased system reliability. 4

5 Portfolio overview Surge arresters for railway applications Siemens surge arresters for railway application protect every part of a railway system from traction substations, transmission lines, cables, and catenary systems to rail vehicles for local, long distance, and high speed services up to 420 km/h. Siemens provides several surge arrester product families for AC and DC rail applications up to 45. For more information, refer to the product guide Surge arresters for railway applications. Medium- surge arresters Siemens provides a wide range of surge arrester product families for the protection of medium systems and components up to The selection of the surge arrester depends on the application to be protected: Distribution systems Siemens 3EK Cage Design distribution class surge arrester product family is ideally suited for the reliable protection of transformers, circuit breakers, medium- 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 in combination with 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 over protection of generators and motors, which require a very high short-circuit capability, Siemens offers the 3EP-G porcelain housed surge arresters with short-circuit capability up to 300 ka. The medium- surge arresters are described in more detail in the next sections of this product guide. Siemens offers a complete portfolio of surge arresters for all application areas and levels 5

6 Medium- surge arresters Product guide Siemens begins developing surge arresters. The first devices are of the so-called cathode drop type. The 3EQ2 surge arrester for systems of up to 550 is one of the first high- surge arresters with composite polymer hollow core housing 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. Development of the first gas-insulated and metalencapsulated surge arrester for gas-insulated switchgear (GIS) Werner von Siemens discovers the dynamo-electric principle, which enables electricity to be put to practical use. The dynamo can convert mechanical energy into electrical energy in an economical way. Its invention lays the foundation for today s world of electrical engineering The first surge arrester for systems of up to 550 is launched. The pulley wheel electrodes are replaced by ceramic-bonded shunt resistors and a series spark gap. The surge arrester comprises three columns in parallel and has a resistivecapacitive control. Continually pushing the envelope, Siemens develops a high- surge arrester with a composite polymer housing for systems of up to 800. It was originally developed as a suspended mounted HVDC valve arrester with several parallel metal oxide columns in a common housing Siemens first gapless metal oxide arrester, a GIS surge arrester, is delivered for the 123 grid in Inchicore, a suburb of Dublin. History timeline Siemens is a pioneer in many fields of the electricity and digitization markets. Experience is most essential when it comes to reliability in medium- and high- applications. Since 1925 Siemens has been manufacturing high- and medium- surge arresters up to rated s of for standard and specialized applications. Our permanent research and development and the concerted know-how in our factories give our surge arresters a leading edge in over protection. Our uncompromising quality ensures the long service life and reliability of each application. 6

7 History timeline 1998 The polymer-housed medium-/distribution class arresters of the 3EK family, which features Cage Design, a unique solution with direct silicone molding on the metal oxide resistors, is introduced Siemens launches the 3EL3, the strongest silicone housed cage design surge arrester available in the market EL2, the first line arrester for 550 applications, is delivered to Sochi, a city in Russia Completion of the first line arrester project, an order from KELAG, one of the leading energy service providers in Austria. Siemens introduces its new range of long rod insulators 3FL. First 3EK4 with Arc Protection System (APS) have been delivered to customers in the USA Development of the 3EQ5, a new surge arrester concept with composite housing (type A) for extra high applications in 800 DC and 1,200 AC transmission systems. The world s first 1,200 substation arrester with composite polymer hollow core technology is delivered to Power Grid Corporation of India. Launch of silicone rubber housed cage design medium- surge arresters of the 3EJ product family with high energy discharge capabilities 2000 Development of the first GIS arrester for systems of up to The first externally gapped line arrester (EGLA), which increases the reliability of a 144 overhead line, is supplied to the South Korean power provider KEPCO Siemens launches the arrester condition monitor, an innovative monitoring solution with unique features The medium- portfolio is completed with the 3EQ0, a medium- surge arrester with directional pressure relief device 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 30 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- outdoor equipment. 7

8 Medium- surge arresters Product guide MOVs: the core of Siemens surge arresters The main task of an arrester is to protect equipment from the effects of overs. 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: Low resistance during surges, so that overs are limited High resistance during normal operation to avoid negative effects on the power system Sufficient energy discharge capability for stable operation With this kind of nonlinear resistor, there is only a small flow of when continuous ope is being applied. When there are surges, however, excess energy can quickly be removed from the power system by a high discharge. 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. Siemens has many years of experience with gapless MO arresters in low- systems, distribution systems, and transmission systems. Siemens metal oxide resistors (MOVs) provide a high energy discharge capability providing a very low protection level. This means they absorb a high amount of energy while avoiding thermal runaways. The MOVs are characterized by their high long-duration impulse withstand capability an indirect measure of their single impulse energy discharge capability. Siemens surge arresters are less prone to self-heating and consequent selfdestruction, and they maintain their characteristics throughout their lifetime. IEC power-frequency vs. time (U-t) characteristic (TOV) p.u. U r Preheating to 60 C prior duty ,000 10,000 t/s 8

9 MOVs / Standards and testing Standards and testing reliability you can count on Tests Siemens surge arresters have been designed and tested in compliance with the latest IEC , IEEE C62.11, and GB standards. All type tests are performed by independent, PEHLA- certified laboratories; reports are available 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 , IEC (EGLA), IEC (HVDC), and the application guide IEC , while the SPDC develops the standard IEEE C62.11 and the application guide IEEE C 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. Innovations in terms of arrester design and manufacturing processes are protected by a wide portfolio of Intellectual Property (IP) rights. The test field is certified by the»deutsche Akkreditierungsstelle«(Germany s national accreditation body) according to DIN EN ISO/IEC Test generator supplying both impulse s (1.2/50 μs and 250/250 μs) and impulse s (8/20 μs and 30/60 μs) UHV arrester prepared for testing in the HV test laboratory 9

10 Medium- surge arresters Product guide How to select a suitable surge arrester This section describes the general approach to selecting typical arresters for over protection in medium- systems. For a detailed description of how to configure a surge arrester, please refer to the handbook Metal-Oxide Surge Arresters in High-Voltage Power Systems Fundamentals. 1 The requirements for a surge arrester emerge from two basic requirements: It should provide adequate protection with a sufficient safety margin, which means that overs at the device to be protected must always remain below its withstand. Furthermore, the surge arrester should be dimensioned for stable continuous operation, which means that the arrester must remain electrically and thermally stable under all conditions while handling all long-term, temporary, and transient stress resulting from network operation. These two requirements cannot be fulfilled independently. A reduction of the protective level automatically means a higher degree of specific electrical stress during continuous operation, and conversely, the continuous ope of an arrester cannot be increased arbitrarily without raising its protective level as well. Both ope points are for a given type of MOV strictly associated with each other through the - (U-I-) characteristic curve. Step 1: Selection of the continuous ope and the rated The first step is to define the minimally required continuous ope U c,min. This must be as high as the continuous phase-to-earth of the system. Here,»continuously«applied means every that occurs within an uninterrupted period of more than 30 minutes. The type of neutral earthing of the system is decisive in determining the continuous ope. In isolated or resonant earthed neutral systems, the of a healthy phase against ground takes on the value of the phase-to-phase in the case of a one-phase earth fault (earth fault factor k = 1.73). Since resonant earthed neutral systems are operated quite commonly for time periods of more than 30 minutes in this condition, the continuous ope of the arrester must, in this case, have the value of the highest of the system, U s. Solidly earthed neutral system: U c,min U s / 3 Isolated or resonant earthed neutral system: U c,min U s Example for a 24 system, solid earthing: U s = 24 U c,min = 13.9 U r,min = 17.3 Typical U r = 18 Example for a 24 system, isolated neutral: U s = 24 U c,min = 24 U r,min = 30 Typical U r = 30 The definition of the minimally required continuous ope, a factor which usually has a value of 1.25, helps achieve a rated U r = 1.25 U c,min. This is the lowest necessary rated of the arrester. Table»Typical rated s U r for highest s of the system U s «on page 14 and 15 lists typically applied rated s Volker Hinrichsen: Metal-Oxide Surge Arresters in High-Voltage Power Systems, 3 rd edition, September 2012, Order No. E50001-G630-H197-X-4A00

11 How to select a suitable surge arrester Step 2: Selection of the nominal discharge I n The nominal discharge I n serves to classify a surge arrester. From a technical point of view, it is calculated from a typical maximum lightning amplitude that can be expected in the substation, for which the insulation coordination is performed via the arrester s lightning protection level. This amplitude is calculated from the flashover U fo of the line insulators, the lightning protection level U pl of the arresters, and the surge impedance Z of the line for I max : Step 3: Selection of protective levels The protective characteristics of an arrester are most frequently assessed by means of its lightning impulse protective level: It is assessed according to its residual while the nominal discharge is flowing. This usually means that a protective level equaling the standard lightning impulse withstand of the device to be protected and divided by a factor of 1.4 is adequate for protection against lightning overs. I max = (2 U fo U pl )/Z U pl, 10 ka, < BIL / 1.4 Example for a 24 system: U fo = 250 U pl = 80 Z = 450 Ohm I max = 0.9 ka The selection of the electrical characteristics of the arrester is finished when the requirements regarding the protective levels of all mentioned impulse stresses are fulfilled. Example U-I-curve 30 arrester A 10 ka arrester, for instance, can readily withstand lightning impulses of higher amplitudes without severe damage. u peak / /2 µs 60 8/20 µs /60 Hz 30/60 µs ,000 10, ,000 I / A 11

12 Medium- surge arresters Product guide How to select a suitable surge arrester Step 4: Selection of the energy class The application guide IEC to the standard IEC describes how the charge transfer and energy handling capability of a surge arrester can be determined. Surge arresters dissipate switching surges by absorbing energy. The charge transfer and amount of energy is related to the switching surge magnitude and wave shape, the system impedance, the arrester protective characteristics, and the number of switching operations. The selected arrester should have charge and energy capability greater than the accumulated charge transferred and energy associated with the expected highest surges on the system. The application guide IEC offers equations to estimate charge transfer and the energy handling capability requirements of surge arresters. Q s = (U rp U ps ) x 2 x L / c Z s W s = U ps x Q s Where: U rp is the representative maximum switching (in ) U ps is the arrester residual during the line discharge (in ) L is the line length with surge travel at light speed c c is the speed of light (300,000 km/s) Q s is the cumulative charges transferred during single line switching (in Coulombs) W s is the cumulative energy absorbed by the arrester during single line switching (in kj/) The application guide IEEE C62.22 offers equations to estimate the energy handling capability requirements of surge arresters. The energy discharged by an arrester J in kj may be estimated by the equation: J = 2D L E A I A / v Where: D L E A I A v is the line length (in kilometers) is the arrester switching impulse discharge (in ) for I A is the switching impulse (in ka) is the speed of light, 300,000 km/s 12

13 How to select a suitable surge arrester The equations assume that the entire line is charged to a prospective switching surge (which exists at the arrester location) and is discharged through the arrester at its protective level during twice the travel time of the line. The single discharge and are related by the equation: I A = (E S E A ) / Z Step 5: Protective zone The protection of the equipment by an arrester can be guaranteed only for short distances between arrester and equipment, due to travelling wave effects on the line. Rapidly increasing overs spread in the form of traveling waves on the line. Refraction and reflection occur in places where the surge impedance of the line changes. The maximum distance between surge arrester and equipment to be protected is described with following formula: Where: E S is the prospective switching surge (in ) Z is the single-phase surge impedance of line (in ohms) The table below shows the definition of the energy class according to standard IEEE C This energy is not a fixed value, but instead depends on the arrester s protective level. The higher the discharge, the less energy the arrester absorbs during the line discharge, since the line will discharge less intensely when the discharge is higher. Energy Class A B C D E F G H J K L M N Energy Rating (Two Shot) kj/ MCOV x s = (BIL / 1.15 U pl ) v tw / 2s Example for a 24 system, solid earthing: U s = 24 BIL = 125 U pl = 47.7 x s = 9.1 m Example for a 24 system, isolated neutral: U s = 24 BIL = 125 U pl = 79.5 x s = 4.4 m Where: x s protective zone (in m) BIL basic insulation level of equipment (in ) U pl protection level of the arrester (in ) s front steepness of incoming surge (in /µs) (in the range of 1000 /µs) v tw propagation speed of travelling wave: 300 m/µs (overhead line) (equals c ) 13

14 Medium- surge arresters Product guide Typical rated s Ur for highest s of the system Us according to IEC Highest of system Isolated neutral system; Delta winding Ur Us 1) Solidly earthed neutral system Impedance earthed neutral system Ur Resonant earthed neutral system Ur Ur ) ) ) 661) 961) High- surge arrester Typical duty cycle s Ur for highest s of the system Us according to IEEE C System L-L Us Four-wire multi-grounded neutral wye Ur Three-wire low impedance neutral circuit Ur Ur or or Three-wire high impedance neutral circuit 18 30

15 Product range and selection data Siemens offers multiple models of each surge arrester product family. The following selection tables show the main technical data according to IEC resp. IEEE C62.11 of the different product lines. Detailed technical data is listed in the sections for each dedicated product line. For additional specifications, please contact your local Siemens representative. Main technical data according to IEC Designation Distribution applications High energy applications & Protection of rotating devices High energy applications & Protection of rotating devices Maximum values 3EK4 3EK7 3EJ2 3EJ3 3EJ4 3EJ0 3EJ9 3EQ0 3EP-G Maximum rated Nominal discharge Thermal energy Repetitive charge transfer ka kj/ r C DH ) 0.4 x x DM x SM x SH x SL x SM x x x SH x x x SH x SH x Rated short-circuit ka High impulse ka Indoor version available x x x 1) Thermal charge transfer Main technical data according to IEEE C62.11 Energy class Distribution applications High energy applications & Protection of rotating devices High energy applications & Protection of rotating devices Maximum values 3EK4 3EK7 3EJ2 3EJ3 3EJ4 3EQ0 3EP-G Maximum duty cycle Lightning impulse classifying Switching surge energy Single impulse withstand ka kj/ MCOV C B x x C x E x x x G x x x J x K x Rated short-circuit ka High short duration ka Indoor version available x x Selection data 15

16 Medium- surge arresters Product guide 16

17 3EK Distribution class surge arresters with silicone rubber housing and Cage Design Introduction 3EK Siemens cage design 3EK distribution class surge arresters offer superior protection against overs in medium systems. Siemens 3EK cage design surge arresters are ideally suited for the reliable protection of: Transformers Circuit breakers Medium- switchgear / panels Distribution lines The metal oxide resistors (MOV) are enclosed by a cage made of fiber-reinforced plastic (FRP) rods, providing a rigid, reinforced structure ensuring high mechanical strength. Reliability is guaranteed by the direct molding of the silicone rubber onto the MOVs and the FRP rods. This ensures the total embedding of all components free of inclusions and gaps, thus providing an excellent sealing system against moisture ingress, which avoids partial discharges. In the extremely rare event of the MOVs being overloaded, arcing cannot result in a buildup of critical internal pressure, since the MOVs are not enclosed in a sealed mechanical shell. The arc can escape directly through the soft silicone housing, leaving the mechanical support structure of the enclosure unharmed. The ejection of internal parts that could damage other equipment nearby is prevented almost completely. Siemens innovative cage design ensures outstanding performance in safety issues. Silicone rubber is highly hydrophobic and maintains its ability to repel water and any deposits of pollution throughout its entire service life. This results in high tracking and erosion resistance. The silicone rubber housing is self-extinguishing and flameretardant. These advantages provide maintenance-free and reliable service life for 3EK surge arresters. Siemens offers two product lines for the application in distribution networks, which differentiate in the mechanical strength: 3EK4 for rated s up to 36, high mechanical performance. 3EK7 for rated s up to 60, very high mechanical performance. The proven 3EK7 is also available in a version for indoor application, which is a cage design surge arrester offering the same benefits as the version for outdoor application. 17

18 Medium- surge arresters Product guide 3EK4 specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal charge transfer Q th C Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EK C B 4 DH EK C B 4 DH EK C C 4 DH EK C C 4 DH EK C F 4 DH EK C J 4 DH EK C J 4 DH EK C K 4 DH EK C K 4 DH EK C M 4 DH EK C R 4 DH EK C R 4 DH ka 3 ka 5 ka 10 ka 20 ka 3EK4 specifications according to IEEE C62.11 standard D uty cycle MCOV Arrester order number Energy class Lightning impulse classifying Electrical Characteristics Single impulse withstand Switching surge energy I n ka C kj/mcov 45/90µs 125 A cr 45/90µs 500 A cr Protective Level Maximum discharge 1.5 ka cr EK A B 4 B EK A B 4 B EK A B 4 B EK A D 4 B EK A D 4 B EK A D 4 B EK A D 4 B EK A F 4 B EK A D 4 B EK A F 4 B EK A F 4 B EK A J 4 B EK A J 4 B EK A K 4 B EK A K 4 B EK A M 4 B EK A K 4 B EK A R 4 B EK A M 4 B EK A R 4 B EK A R 4 B EK A R 4 B EK A R 4 B ka cr 5 ka cr 10 ka cr 20 ka cr 18

19 3EK4 specifications 3EK Height [H] Creepage distance Rated short-circuit Lightning impulse withstand 1.2/50µs Mechanical Characteristics Housing insulation Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance Power frequency withstand 1 min., wet N N kg mm mm mm I s ka Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs inch inch Is ka

20 Medium- surge arresters Product guide 3EK7 specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal charge transfer Q th C Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EK C B 4 DH EK C B 4 DH EK C B 4 DH EK C C 4 DH EK C C 4 DH EK C D 4 DH EK C D 4 DH EK C E 4 DH EK C E 4 DH EK C F 4 DH EK C H 4 DH EK C H 4 DH EK C H 4 DH EK C H 4 DH EK C H 4 DH EK C H 4 DH EK C J 4 DH EK C J 4 DH EK C J 4 DH ka 3 ka 5 ka 10 ka 20 ka 3EK7 indoor version specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal charge transfer Q th C Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EK C B 0 DH EK C B 0 DH EK C B 0 DH EK C C 0 DH EK C C 0 DH EK C D 0 DH EK C D 0 DH EK C E 0 DH EK C E 0 DH EK C F 0 DH EK C G 0 DH EK C H 0 DH EK C H 0 DH EK C H 0 DH EK C H 0 DH EK C H 0 DH EK C J 0 DH EK C J 0 DH EK C J 0 DH ka 3 ka 5 ka 10 ka 20 ka 20

21 3EK7 specifications 3EK Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm Mechanical Characteristics Height Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, dry Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance [H] mm mm I s ka 1.2/50µs 1 min. N N kg mm

22 Medium- surge arresters Product guide 3EK7 specifications according to IEEE C62.11 standard Duty cycle MCOV Arrester order number Energy class Lightning impulse classifying Electrical Characteristics Single impulse withstand Switching surge energy I n ka C kj/mcov 45/90µs 125 A cr Protective Level Maximum discharge 45/90µs 500 A cr 1.5 ka cr EK A B 4 B EK A B 4 B EK A B 4 B EK A B 4 B EK A B 4 B EK A C 4 B EK A B 4 B EK A C 4 B EK A C 4 B EK A D 4 B EK A D 4 B EK A D 4 B EK A D 4 B EK A E 4 B EK A E 4 B EK A F 4 B EK A F 4 B EK A H 4 B EK A F 4 B EK A H 4 B EK A H 4 B EK A H 4 B EK A H 4 B EK A J 4 B EK A H 4 B EK A K 4 B ka cr 5 ka cr 10 ka cr 20 ka cr 22

23 3EK7 specifications 3EK Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight inch inch Is ka To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs

24 Medium- surge arresters Product guide 3EK7 indoor version specifications according to IEEE C62.11 standard Duty cycle MCOV Arrester order number Energy class Lightning impulse classifying Electrical Characteristics Single impulse withstand Switching surge energy I n ka C kj/mcov 45/90µs 125 A cr Protective Level Maximum discharge 45/90µs 500 A cr 1.5 ka cr EK A B 0 B EK A B 0 B EK A B 0 B EK A B 0 B EK A B 0 B EK A B 0 B EK A B 0 B EK A C 0 B EK A C 0 B EK A D 0 B EK A D 0 B EK A D 0 B EK A D 0 B EK A E 0 B EK A E 0 B EK A F 0 B EK A F 0 B EK A H 0 B EK A G 0 B EK A H 0 B EK A H 0 B EK A H 0 B EK A H 0 B EK A J 0 B EK A H 0 B EK A K 0 B ka cr 5 ka cr 10 ka cr 20 ka cr 24

25 3EK7 indoor specifications 3EK Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight inch inch Is ka To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs

26 Medium- surge arresters Product guide 3EK Drawings Dimensions 3EK4 IEC Dimensions 3EK4 IEEE Dimensions 3EK7 IEC Dimensions 3EK7 IEEE 26

27 Drawings 3EK Dimensions 3EK7 indoor IEC Dimensions 3EK7 indoor IEEE 27

28 Medium- surge arresters Product guide 3EK Accessories Line terminal options Line clamp For surge arrester 3EK4 and 3EK7 Order extension code: M11 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C L-bracket For surge arrester 3EK4 and 3EK7 Order extension code: M12 Order number spare part: 3EX4 071 Line clamp For surge arrester 3EK7 Order extension code: M13 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C 28

29 Accessories 3EK Bird protection cap options Bird protection cap For surge arrester 3EK4 Order extension code: M81 Order number spare part: 3EX4 102 Bird protection cap For surge arrester 3EK7 Order extension code: M81 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C Bird protection cap XL For surge arrester 3EK7 Order extension code: M84 Order number spare part: 3EX

30 Medium- surge arresters Product guide Metal bracket options NEMA metal bracket For surge arrester 3EK4 and 3EK7 Order extension code: P11 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C DIN metal bracket For surge arrester 3EK4 and 3EK7 Order extension code: P21 Order number spare part: 3EX

31 Accessories 3EK Insulating bracket options NEMA insulating bracket for Ur 15 For surge arrester 3EK4 Order extension code: P12 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C NEMA insulating bracket for Ur > 15 For surge arrester 3EK4 Order extension code: P12 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C 31

32 Medium- surge arresters Product guide Insulating bracket options NEMA insulating bracket for Ur 15 For surge arrester 3EK7 Order extension code: P12 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C NEMA insulating bracket for Ur > 15 For surge arrester 3EK7 Order extension code: P12 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C 32

33 Accessories 3EK DIN insulating bracket for Ur 15 For surge arrester 3EK4 Order extension code: P22 Order number spare part: for thread M12: 3EX C DIN insulating bracket for Ur > 15 For surge arrester 3EK4 Order extension code: P22 Order number spare part: for thread M12: 3EX C 33

34 Medium- surge arresters Product guide Insulating bracket options DIN insulating bracket for Ur 15 For surge arrester 3EK7 Order extension code: P22 Order number spare part: for thread M12: 3EX C DIN insulating bracket for Ur > 15 For surge arrester 3EK7 Order extension code: P22 Order number spare part: for thread M12: 3EX C 34

35 Accessories 3EK Disconnector options Disconnector For surge arrester 3EK4 and 3EK7 Order extension code: P31 Order number spare part: for thread M12: 3EX C Disconnector For surge arrester 3EK4 and 3EK7 Order extension code: P31 Order number spare part: for thread 3/8 : 3EX A 35

36 Medium- surge arresters Product guide Mounting options Transformer bracket, 8.7 inch / 221 mm For surge arrester 3EK4 and 3EK7 Order extension code: Q11 Order number spare part: 3EX A Transformer bracket, 11 inch / 279 mm For surge arrester 3EK4 and 3EK7 Order extension code: Q12 Order number spare part: 3EX C Transformer bracket, inch / 311 mm For surge arrester 3EK4 and 3EK7 Order extension code: Q13 Order number spare part: 3EX B 36

37 Accessories 3EK Transformer bracket, 14.5 inch / 368 mm For surge arrester 3EK4 and 3EK7 Order extension code: Q14 Order number spare part: 3EX D Cross-arm bracket For surge arrester 3EK4 and 3EK7 Order extension code: Q51 Order number spare part: 3EX A 37

38 Medium- surge arresters Product guide Lead options Ground strap, 305 mm / 12 inch For surge arrester 3EK4 and 3EK7 Order extension code: P52 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C Line and earth lead, insulated For surge arrester 3EK4 and 3EK7 Order extension code: R51 Order number spare part: for thread 3/8 : 3EX A for thread M12: 3EX C Line and earth lead For surge arrester 3EK4 and 3EK7 Order extension code: R61 38

39 Accessories / Disconnector / APS 3EK Disconnector A disconnector is a device at the earth terminal of the arrester, which separates the arrester from the system after an overloading. Without a disconnector at least in a solidly earthed neutral system a subsequent operation of the appropriate line section would no longer be possible. The disconnector is of great importance for a trouble-free operation of a distribution network. Disconnectors are only used in distribution systems. One of the most common working principles of disconnectors is the ignition of a small explosive device (e.g., the cartridge of a gas pistol) caused by the thermal effect of the powerfrequency earth fault, which flows after an arrester failure. The explosive device tears the surrounding polymeric housing and causes the flexible earthing lead to disconnect from the arrester. Arc Protection System When over exceeds the energy capacity of an arrester, the MO resistors become damaged, causing a permanent failure of the arrester. A fault is developed and arcing begins to occur on the two terminals of the arrester. Molten metal can fall to the ground and ignite groundcover, leading to wildfires that can harm people and wildlife, and damage trees and structures in the area. Siemens distribution arresters with APS fulfill the requirements of Cal Fire s Power Line Fire Prevention Field Guide (2008). They successfully passed all required testing with 100% compliance. As a result, Siemens surge arresters with APS record a substantially lower spark production rate than arresters without APS. Therefore, Siemens Type 3EK distribution class surge arresters can be configured with an Arc Protection System (APS) installed at both ends of the arrester. The APS unit consists of multiple metallic plates forming electrodes which are shaped and aligned in a way that the flowing through the electrodes generates a magnetic field. That magnetic force makes the arc rotate around the arrester body, controlling and containing it, mitigating the creation of molten material coming from the end fittings, and thus greatly reducing the risk of wildfires. The APS is available for Types 3EK4 and 3EK7. Especially in hot and dry regions with high risks of wildfires, such as the Western US and South Australia, surge arresters with APS are highly recommended. The surge arrester can also be equipped with a visible fault feature. In the event of an arrester failure, a red indicator will appear at the bottom of the arrester. 39

40 Medium- surge arresters Product guide Packing dimensions 3EK Arrester type Housing Length Width Height mm inch mm inch mm inch Housing B Housing C Housing F EK4 Housing J Housing K Housing M Housing R Arrester type Housing Length Width Height mm inch mm inch mm inch Housing B Housing C Housing D Housing E EK7 Housing F Housing G Housing H Housing J Housing K Arrester type Housing Length Width Height 3EK7, incl. mounted options P12 and P31 mm inch mm inch mm inch Housing B Housing C Housing D Housing E Housing F Housing G Housing H Housing J Housing K

41 Introduction 3EJ 3EJ Surge arresters with high energy discharge capabilities with silicone rubber housing and Cage Design Siemens cage design 3EJ high energy discharge surge arresters offer superior protection against overs in medium- systems. The metal oxide resistors (MOV) are enclosed by a cage made of fiber-reinforced plastic (FRP) rods, providing a rigid, reinforced structure ensuring high mechanical strength. Reliability is guaranteed by the direct molding of the silicone rubber onto the MOVs and the FRP rods. This ensures the total embedding of all components free of inclusions and gaps, thus providing an excellent sealing system, which avoids partial discharges or moisture ingress. In the extremely rare event of the MOVs being overloaded, arcing cannot result in a buildup of critical internal pressure, since the MOVs are not enclosed in a sealed mechanical shell. The arc can escape directly through the soft silicone housing, leaving the mechanical support structure of the enclosure unharmed. The ejection of internal parts that could damage other equipment nearby is prevented almost completely. Siemens innovative cage design ensures outstanding performance in safety issues. Silicone rubber is highly hydrophobic and maintains its ability to repel water and any deposits of pollution throughout its entire service life. This results in high tracking and erosion resistance. The silicone rubber housing is self-extinguishing and flameretardant. These advantages provide maintenance-free and reliable service life for 3EJ surge arresters. Siemens offers five product lines for the application with high energy discharge, which differentiate in the protection level: 3EJ2 for rated s up to 54, medium energy discharge capability. 3EJ3 for rated s up to 54, high energy discharge capability. 3EJ4 for rated s up to 54, very high energy discharge capability. 3EJ0 for rated s up to 15, very low protection levels for protection against switching over s. 3EJ9 for rated s up to 12, very low protection levels for protection against switching over s. The proven 3EJ4 is also available in a version for indoor application, which is a cage design surge arrester offering the same benefits as the version for outdoor application. The 3EJ0 and 3EJ9 surge arresters have been optimized for the protection against over s caused by switching in combination with very low protection levels. The 3EJ0 surge arresters are normally used in cable systems up to 15. For station service systems of power stations and extensive cable systems the 3EJ9 surge arresters are used having a higher energy absorption capability and improved protection level. Siemens 3EJ cage design surge arresters are ideally suited for the reliable protection of: Generators Motors Arc furnaces Arc furnace transformers Dry type transformers Airfield-lighting systems Cable sheath Capacitors and capacitor banks Converters for drives 41

42 Medium- surge arresters Product guide 3EJ2 specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal energy W th kj/ r Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EJ C B SM EJ C B SM EJ C B SM EJ C B SM EJ C C SM EJ C C SM EJ C C SM EJ C C SM EJ C D SM EJ C D SM EJ C D SM EJ C E SM EJ C E SM EJ C F SM EJ C G SM EJ C G SM EJ C H SM EJ C H SM EJ C J SM EJ C J SM ka 3 ka 5 ka 10 ka 20 ka 3EJ2 specifications according to IEEE C62.11 standard Rated Ur Continuous ope Uc Arrester type Energy class Lightning impulse classifying I n ka Electrical Characteristics Switching surge energy kj/ mcov Single impulse withstand C 45/90µs 125 A cr Protective Level maximum discharge 45/90µs 500 A cr EJ A B E EJ A B E EJ A C E EJ A C E EJ A C E EJ A D E EJ A D E EJ A D E EJ A E E EJ A E E EJ A F E EJ A G E ka cr 3 ka cr 5 ka cr 10 ka cr 20 ka cr 42

43 3EJ2 specifications 3EJ Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight inch inch Is ka To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs

44 Medium- surge arresters Product guide 3EJ3 specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal energy W th kj/ r Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C B SH EJ C C SH EJ C C SH EJ C C SH EJ C C SH EJ C C SH EJ C C SH EJ C C SH EJ C C SH EJ C C SH EJ C D SH EJ C D SH EJ C D SH EJ C D SH EJ C D SH EJ C E SH EJ C E SH EJ C E SH EJ C E SH EJ C F SH EJ C F SH EJ C F SH EJ C F SH EJ C G SH EJ C G SH EJ C H SH EJ C H SH EJ C J SH EJ C J SH EJ C J SH EJ C J SH EJ C K SH EJ C K SH EJ C K SH EJ C K SH EJ C L SH ka 3 ka 5 ka 10 ka 20 ka 44

45 3EJ3 specifications 3EJ Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm

46 Medium- surge arresters Product guide 3EJ3 specifications according to IEEE C62.11 standard Duty cycle Ur MCOV Arrester order number Energy class Uc Lightning impulse classifying I n ka Electrical Characteristics Switching surge energy kj/ mcov Single impulse withstand C 45/90µs 125 A cr 45/90µs 500 A cr Protective Level Maximum discharge EJ A B G EJ A B J EJ A B G EJ A C J EJ A C G EJ A C J EJ A C G EJ A C J EJ A C G EJ A D J EJ A D G EJ A D J EJ A D G EJ A E J EJ A E G EJ A E J EJ A E G EJ A F J EJ A F G EJ A F J EJ A F G EJ A G J EJ A G G EJ A H J ka cr 3 ka cr 5 ka cr 10 ka cr 20 ka cr 46

47 3EJ3 specifications 3EJ Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight inch inch Is ka To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs

48 Medium- surge arresters Product guide 3EJ4 specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal energy W th kj/ r Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EJ C B SH EJ C B SH EJ C C SH EJ C C SH EJ C C SH EJ C D SH EJ C D SH EJ C D SH EJ C E SH EJ C E SH EJ C F SH EJ C G SH EJ C G SH EJ C H SH EJ C H SH EJ C J SH EJ C J SH ka 3 ka 5 ka 10 ka 20 ka 3EJ4 specifications according to IEEE C62.11 standard Duty cycle Ur MCOV Arrester type Energy class Uc Lightning impulse classifying I n ka Electrical Characteristics Switching surge energy kj/ mcov Single impulse withstand C 45/90µs 125 A cr 45/90µs 500 A cr Protective Level Maximum discharge EJ A B K EJ A B K EJ A C K EJ A C K EJ A C K EJ A D K EJ A D K EJ A D K EJ A E K EJ A E K EJ A F K EJ A G K ka cr 3 ka cr 5 ka cr 10 ka cr 20 ka cr 48

49 3EJ4 specifications 3EJ Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight inch inch Is ka To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs

50 Medium- surge arresters Product guide 3EJ4 indoor version specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal energy W th kj/ r Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EJ C B SH EJ C B SH EJ C C SH EJ C C SH EJ C C SH EJ C D SH EJ C D SH EJ C D SH EJ C E SH EJ C E SH EJ C F SH ka 3 ka 5 ka 10 ka 20 ka 3EJ4 indoor version specifications according to IEEE C62.11 standard Duty cycle Ur MCOV Arrester type Energy class Uc Lightning impulse classifying I n ka Electrical Characteristics Switching surge energy kj/ mcov Single impulse withstand C 45/90µs 125 A cr 45/90µs 500 A cr Protective Level Maximum discharge EJ A B K EJ A B K EJ A C K EJ A C K EJ A C K EJ A D K EJ A D K EJ A D K EJ A E K EJ A E K EJ A F K ka cr 3 ka cr 5 ka cr 10 ka cr 20 ka cr 50

51 3EJ4 indoor specifications 3EJ Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight inch inch Is ka To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs

52 Medium- surge arresters Product guide 3EJ0 specifications Electrical Characteristics Rated Continuous ope Arrester type Nominal discharge Charge transfer Thermal energy Maximum values of the residual s at discharge s of the following impulses Ur Uc I n ka Q rs C W th kj/ r 30/60µs 125 A 30/60µs 250 A 30/60µs 500 A 30/60µs 1 ka EJ C B EJ C B EJ C B EJ C C EJ C C ka 10 ka 3EJ9 specifications Electrical Characteristics Rated Continuous ope Arrester type Nominal discharge Charge transfer Thermal energy Maximum values of the residual s at discharge s of the following impulses Ur Uc I n ka Q rs C W th kj/ r 30/60µs 125 A 30/60µs 250 A 30/60µs 500 A 30/60µs 1 ka EJ C B 3 1-4A EJ C B 3 1-4A EJ C C 3 1-4A EJ C B 7 1-4B EJ C C 3 1-4A EJ C C 7 1-4B ka 10 ka 3EJ9 indoor version specifications Electrical Characteristics Rated Continuous ope Arrester type Nominal discharge Charge transfer Thermal energy Maximum values of the residual s at discharge s of the following impulses Ur Uc I n ka Q rs C W th kj/ r 30/60µs 125 A 30/60µs 250 A 30/60µs 500 A 30/60µs 1 ka EJ CB71-0B EJ CC71-0B ka 10 ka 52

53 3EJ0, 3EJ9 specifications 3EJ Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm

54 Medium- surge arresters Product guide 3EJ Drawings Dimensions 3EJ0 Dimensions 3EJ2 Dimensions 3EJ3 54

55 Drawings 3EJ Dimensions 3EJ4 Dimensions 3EJ4 indoor Dimensions 3EJ A Dimensions 3EJ B 55

56 Medium- surge arresters Product guide 3EJ Accessories Line terminal options L-bracket Order number: 3EX L Flat DIN/NEMA terminal 40 2 x 50 2 mm Order number: 3EX X 56

57 Accessories 3EJ Mounting options Mounting, insulated Ø mm. D=10 Order number: 3EX A Mounting, insulated 170x170 mm Order number: 3EX B Mounting, insulated 200x200 mm Order number: 3EX C 57

58 Medium- surge arresters Product guide Mounting options Mounting, insulated 310x310 mm Order number: 3EX D Mounting, grounded Ø mm. D=10 Order number: 3EX A Mounting, grounded 170x170 mm Order number: 3EX B 58

59 Accessories 3EJ Mounting, grounded 200x200 mm Order number: 3EX C Mounting. grounded 310x310 mm Order number: 3EX D 59

60 Medium- surge arresters Product guide Packing dimensions 3EJ Arrester type Housing Length Width Height mm inch mm inch mm inch 3EJ0 Housing B Housing C EJ2 All housings EJ3 All housings EJ4 All housings EJ9 All housings

61 Introduction 3EQ0 3EQ0 Silicone rubber surge arresters with composite hollow core design For applications requiring a surge arrester with silicone rubber housing with a directional pressure relief device. Siemens offers the 3EQ0 for rated s up to 45. Siemens 3EQ0 composite hollow core design surge arresters are ideally suited for the reliable protection of: Generators Motors Arc furnaces Arc furnace transformers Dry type transformers Airfield-lighting systems Cable sheath Capacitors and capacitor banks Converters for drives Siemens innovative composite hollow core design uses silicone and an FRP hollow core as housing materials. The direct molding of the silicone rubber onto the FRP hollow core ensures reliability, while an excellent special sealing of the flanges at both ends of the surge arrester effectively prevents moisture ingress, which avoids partial discharges. The combination of silicone rubber and fiberglass-reinforced hollow core also allows an enormous load carrying capacity for the structure. The excellent sealing system of 3EQ0 surge arresters prevents failures or moisture ingress and guarantees decades of troublefree service. The composite hollow core design provides a very high degree of safety: In the case of an overload or the extremely rare case of an arrester short circuit, the arc escapes directly through directional pressure relief device, internal parts are not ejected, and the housing does not break. 61

62 Medium- surge arresters Product guide 3EQ0 specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Designation Nominal discharge I n ka Electrical Characteristics Charge transfer Q rs C Thermal energy W th kj/ r Maximum values of the residual s at discharge s of the following impulses 30/60µs 125 A 30/60µs 500 A EQ P B SL EQ P B SM EQ P B SH EQ P B SL EQ P B SM EQ P B SH EQ P B SL EQ P B SM EQ P C SH EQ P C SL EQ P E SM EQ P C SH EQ P E SL EQ P E SM EQ P E SH EQ P E SL EQ P E SM EQ P E SH EQ P E SL EQ P E SM EQ P E SH EQ P E SL EQ P H SM EQ P E SH EQ P E SL EQ P H SM EQ P H SH EQ P H SL EQ P H SM EQ P H SH EQ P H SL EQ P H SM EQ P H SH EQ P H SL EQ P H SM EQ P H SH EQ P H SL EQ P H SM EQ P H SH ka 3 ka 5 ka 10 ka 20 ka 62

63 Specifications 3EQ0 Mechanical Characteristics Height [H] Creepage distance Rated short-circuit Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm I s ka 1.2/50µs 1 min. N N kg mm

64 Medium- surge arresters Product guide 3EQ0 specifications according to IEEE C62.11 standard Rated Ur Continuous ope Uc Arrester type Energy class Lightning impulse classifying I n ka Electrical Characteristics Switching surge energy kj/ mcov Single impulse withstand C 30/60µs 125 A Protective Level maximum discharge 30/60µs 500 A EQ A B E EQ A B G EQ A B E EQ A B G EQ A B E EQ A C G EQ A B E EQ A C G EQ A E E EQ A C G EQ A E E EQ A E G EQ A E E EQ A E G EQ A E E EQ A E G EQ A H E EQ A E G EQ A H E EQ A H G EQ A H E EQ A H G EQ A H E EQ A H G EQ A H E EQ A H G EQ A H E EQ A H G ka 3 ka 5 ka 10 ka 20 ka 64

65 Specifications 3EQ0 Mechanical Characteristics Height [H] Leakage distance Rated short-circuit Recommended minimum clearances Cantilever strength MDCL Weight inch inch Is ka To ground (ph-gnd) inch Between phases (ph-ph) inch lbf lbs

66 Medium- surge arresters Product guide 3EQ0 Drawings Dimensions 3EQ0 66

67 3EQ0 Accessories Line terminal options Drawings / Accessories 3EQ0 L-bracket Order number: 3EQ Q.. Flat DIN/NEMA terminal 40 2 x 50 2 mm (stainless steel) Order number: 3EQ Y.. 67

68 Medium- surge arresters Product guide Mounting options Mounting, grounded 200x200 mm Order number: 3EQ Mounting, insulated 200x200 mm Order number: 3EQ

69 Accessories 3EQ0 Mounting, insulated 310x310 mm Order number: 3EQ Mounting, grounded 310x310 mm Order number: 3EQ

70 Medium- surge arresters Product guide Mounting options Mounting, grounded Ø mm. D=10 Order number: 3EQ Mounting, insulated Ø mm. D=10 Order number: 3EQ

71 Accessories / Packing 3EQ0 Packing dimensions 3EQ0 Arrester type Housing Length Width Height mm inch mm inch mm inch Housing B EQ0 Housing C Housing E Housing H

72 Medium- surge arresters Product guide 72

73 Introduction 3EP-G 3EP-G Porcelain surge arresters Siemens 3EP porcelain-housed surge arresters ensure maximum protection in an overload situation thanks to a specially designed directional pressure relief device. In the case of an overload or the extremely rare case of an arrester short circuit, the arc escapes easily through the pressure relief devices. No pressure is built up inside the arrester and no internal parts are ejected, which prevents damage to surrounding equipment. For the over protection of generators and motors, which require a very high short-circuit capability, Siemens offers the 3EP-G porcelain housed surge arresters with short-circuit capability up to 300 ka. The excellent sealing system of 3EP-G surge arresters prevents failures or moisture ingress and guarantees decades of troublefree service. The use of nonporous sulfur cement instead of corrosive Portland cement for bonding protects the MO resistors and prevents aging effects. The MO resistors of 3EP surge arresters are enclosed by a rigid, reinforced cage made of FRP rods. The high tensile strength of the FRP rods is used to hold the arrester s MO resistors in place tightly. 73

74 Medium- surge arresters Product guide 3EP-G specifications according to IEC standard Rated Ur Continuous ope Uc Arrester type Short circuit I s ka Electrical Characteristics Nominal discharge I n ka Charge transfer Q rs C Thermal energy W th kj/ r Maximum values of the residual s at discharge s of the following impulses EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G A 4 1-1ZA9-Z K81 P2E R2E EP G A 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G B 4 1-1ZA9-Z K81 P2E R2E EP G B 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G B 4 1-1ZA9-Z K81 P2E R2E EP G B 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G B 4 1-1ZA9-Z K81 P2E R2E EP G B 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G EP G B 4 1-1ZA9-Z K81 P2E R2E EP G B 4 1-1ZA9-Z K82 P2F R2F EP G A 3 1-1ZA9-Z K83 P2G R2G /60µs 125 A 30/60µs 500 A 1 ka 3 ka 5 ka 10 ka 20 ka 74

75 Specifications 3EP-G Mechanical Characteristics Height [H] Creepage distance Lightning impulse withstand Power frequency withstand, wet Specified short-term load SSL Specified long-term load SLL Maximum weight of arrester Flashover distance mm mm 1.2/50µs 1 min. N N kg mm

76 Medium- surge arresters Product guide 3EP-G Dimensional drawings Dimensions 3EP2-G Dimensions 3EP3-G 76