Siemens 3EL2 Operating Instructions Manual
Surge Arrester Type 3EL2
model or ornamental design registration.
Operating instructions Order-No.: 928 00047 176
contents to others without expressed authorization is prohibited. Offenders will be held liable
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© Siemens AG • 07/2003
Contents
Contents _________________________________________________________________________2
Technical data 4
Description 5
Design 5
Mode of operation 5
Transportation and storage 6
Screwed joints 7
Installation _______________________________________________________________________8
Accessories 8
Place of installation 8
Mounting the components 8
Installing of the arrester 9
Grounding 12
Terminal 12
Exploded view ___________________________________________________________________14
Maintenance _____________________________________________________________________16
Disposal arrester and arrester accessories 16
2 © Siemens AG • 07/2003
The manufacturer of this surge arrester
Siemens AG
Power Transmission and Distribution Group
High Voltage Division
has introduced and applies a quality system in accordance with
DIN ISO 9001 / EN 29 001
Quality systems: Model for quality assurance This system was first demonstrated in 1989 to the
DQS (German Association for the Certification of Quality Systems).
The electrical testing laboratories and the materials technology laboratories of the manufacturer
have been certified since 1992 by the German Accreditation Body in accordance with DIN EN 45 001.
If you require further copies of the operating instructions, please order them from the appropriate Siemens office,
indicating the title and order number shown on the title page.
Published by: In case of request:
Siemens AG Telephone exchange +49 / 30 / 386 1
PTD H 4 Sales department: +49 / 30 / 386 23061
D-13623 Berlin Fax: +49 / 30 / 386 26721
e-mail: mailto:Arrester@Siemens.de
Subject to change.
Note
The equipment covered by these instructions should be installed and serviced only by
competent personnel familiar with good safety practices. This instruction is written for
such personnel and is not intended as a substitute for adequate training an experience in
safe procedures.
This information is intended for the correct installation of this product. Siemens has no control over the condition of the network, which can be greatly affected by the installation of a product. It is the responsibility of the
user to chose the appropriate method of installation. Under no circumstance is Siemens liable for any direct or
indirect damage caused by the use or misuse of this product.
© Siemens AG • 07/2003 3
The 3EL2 surge arrester serves to protect the insulation of a system (or of one of its components) from
undue stresses resulting from overvoltages.
Technical data
The standard model is suitable for an installation altitude of up to 1000 m above sea-level and for a
rated frequency between 48 Hz and 62 Hz.
Fig. 1 Surge arrester type 3EL2
The surge arrester meets the following standards:
Standard Classification
VDE 0675, Teil 4/A2 : 2000-07 10 kA
IEC 60099-4, Ed. 1.2, 2001-12 10 kA, Heavy duty
ANSI C62.11-1999 Station valve arrester
The rating plate [Fig. 2] will be found on the lowest flange (in some cases this has a special design in
accordance with customer requirements).
1 Order number 6 Pressure relief class
2 Rated voltage 7 Year of manufacture
3 Continuous voltage 8 Works serial no.
4 Rated discharge current 9 Module no. of upper arrester unit
5 Line discharge class 10 Module no. of lower arrester unit
Fig. 2 Rating plate
In the case of arresters in several sections, each module will also be provided with a module plate [Fig.
3]:
4 © Siemens AG • 07/2003
1 Order number 3 Year of manufacture
2 Rated voltage 4 Unit no.
Fig. 3 Module plate
Description
Design
The active components of the arrester are metal oxide resistors. They are arranged in a stack and
hermetically protected against environmental influences by means of a directly mounted silicon enclosure. The mechanical strength is attained by glass-fibre-reinforced polymer rods which tightly enclose
and compress the resistor stack. Thanks to its hydrophobic properties, the silicon enclosure minimises
electrical discharges on the enclosure surface and thus ensures particularly good operating characteristics, even under conditions of heavy pollution.
The flanges are made of a lightweight metal alloy suitable for use outdoors and directly connected with
the silicon enclosure.
The MO resistors are tightly enclosed by the GRP rods (as if in a cage). In the event of resistor overload – an extremely unlikely case, but which cannot entirely be ruled out – the resultant arc produces
no overpressure, since the resistors are not enclosed by a sealed, mechanically rigid casing. The arc
escapes immediately through the silicon enclosure, without any abrupt rupturing of the mechanical load
bearing enclosing structure. At the same time the MO resistors are held largely in place by a considerable number of GRP rods. The risk of parts flying off is therefore minimised.
The arresters are, where necessary, equipped with control fittings and / or shields.
Mode of operation
Metal oxide resistors are markedly non-linear - in other words, they have a strongly curved currentvoltage characteristic, which means that with the continuous voltage obtaining under normal circumstances only the so-called leakage current of just a few milliamps will be flowing.
In the case of overvoltages due to lightning or to switching operations, the resistors become conductive
(ohm range) thereby allowing a discharge current to flow to ground and the overvoltage to be reduced
to the value of the voltage drop at the arrester (“discharge voltage”). Here the discharge currents may
range up to 2 kA in the case of switching surges and 1 - 10 - 20 kA in the case of lightning surges.
© Siemens AG • 07/2003 5
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