Siemens Aktiengesellschaft
All rights reserved.
© Siemens AG • 08/2016
Surge arrester 3EB5
with polymeric composite housing
for operating aboard traction units
Operating instructions Order No.: 928 00186 176 a
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2 © Siemens AG • 08/2016
Inhalt
Description _______________________________________________________________________ 4
Technical data 4
Design 5
Mode of operation 5
Transport and storage _____________________________________________________________ 7
Montage _________________________________________________________________________ 7
Screwed joints 7
Place of installation 8
Installing of the arrester 8
Earthing 8
Terminal 9
Maintenance _____________________________________________________________________10
Disposal of arrester and arrester accessories _________________________________________11
© Siemens AG • 08/2016 3
The manufacturer of this surge arrester
Siemens AG
Energy Sector · Power Transmission
High Voltage
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
E T HP AR Sales department: +49 / 30 / 386 33222
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 and 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.
4 © Siemens AG • 08/2016
Description
The 3EB5 surge arrester serves to protect the insulation of a system (or of one of its components)
from undue stresses resulting from overvoltages. It is designed for special operating conditions en-
countered aboard traction units.
Technical data
The standard model is suitable for the operation of up to 1800 m above sea-level and for a rated fre-
quency between 16 2\\3 Hz and 62 Hz AC (3EB5 …-.A-..) and DC (3EB5 …-.D-..) respectively.
The surge arrester meets the following standards when applicable:
3EB5 …-6….-..
Standard
Classification
VDE 0675-4
10 kA, Designation SM
IEC 60099-4
10 kA, Designation SM
3EB5 …-7….-.. / 3EB5 …-8….-..
Standard
Classification
VDE 0675-4
20 kA, Designation SH
IEC 60099-4
20 kA, Designation SH
3EB5 …-6….-..
3EB5 …-7….-.. / 3EB5 …-8….-..
Fig.
1
Surge arrester type 3EB5
The rating plate [Fig. 2] is attached to the top flange.
© Siemens AG • 08/2016 5
Arrester type | Designation | Rated voltage | Nominal discharge current | Repetitive charge transfer rating | Continuous operating
voltage | Rated short-circuit current | Serial number | Year of manufacture
Fig.
2
Rating plate
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 enclo-
sure. 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 character-
istics, 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 metal-oxide (MO) resistors are tightly enclosed by the fibre-reinforced plastic (FRP) 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 FRP 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 current-
voltage characteristic, which means that with the continuous voltage under normal circumstances only
the so-called leakage current of just a few milliamps will flow.
In the case of overvoltages due to lightning or to switching operations, the resistors become conduc-
tive (ohm range) thereby allowing a discharge current to flow to ground and the overvoltage to be re-
duced to the value of the voltage drop at the arrester (“discharge voltage”). Here the discharge cur-
rents may range up to 2 kA in the case of switching surges and 1 - 10 - 20 kA in the case of lightning
surges.
6 © Siemens AG • 08/2016
1 Polymeric composite housing
2 Non-linear metal-oxide resistor
3 Insulating rods
4 Flange
Fig.
3
Sectional view of a modular unit
© Siemens AG • 08/2016 7
Transport and storage
The arresters are packed according to the stresses and climatic conditions during transportation and
to the customer’s specifications.
The packing is provided with signs for transport and storage as well as directives for appropriate han-
dling. As soon as the shipment arrives examine it for signs of damage. If such damage be found im-
mediately notify the forwarding agent. Any parts packed separately should be checked against the
dispatch notes. All the boxes should be opened for this purpose.
With long storage it is recommended to leave the units and the accessories in the transport packing.
As protection against mechanical, chemical and thermal influences (e.g. direct solar radiation, etc.) the
surge arresters must be stored in a normally cool, dry and “dust-free environment.
Storage temperatures: -50°C to +60°C
Relative air humidity below 80% at 15°C as annual mean value, 100% at 25°C as maximum value.
Surge arresters which are removed from the vehicle must be thoroughly cleaned before storage.
Montage
Note the following before installing:
Warning
Before any work starts:
switch off and isolate
secure against reclosing
verify that equipment is dead
earth and short circuit the equipment
cover or fence off nearby live parts
Death, severe injury and considerable damage to
property and environmental damage may result if
the safety instructions are not followed.
Confirm that these safety measures have been carried out.
Accessories
With the standard model, the following accessories are included in the scope of supply:
Connecting lug for earth connection
Screwed joints
For mounting the arrester use only the bolts supplied.
Grease the bolt threads with Molykote Longterm 2 plus.
Attention
Unchecked tightening can result in damage or loosing of bolt
joints
Use torque wrench for assembly.
Necessary torque for screwed joints:
M 8:
18 ± 2 Nm
M 10:
35 ± 5 Nm
M 12:
60 ± 5 Nm
M 16:
90 ± 10 Nm
M 20:
105 ± 10 Nm
8 © Siemens AG • 08/2016
Place of installation
The protective range of the surge arresters is limited. The place of installation must therefore be as
close as possible to the equipment to be protected. The distance to earthed or live parts must be in
accordance with relevant standards.
The arresters must be fitted vertically. If non-vertical installation is desired, confer with the manufac-
turer.
Installing of the arrester
The contact faces of the flanges of the arresters must be bright. The arresters can be mounted with 3
head screws or stud bolts M12 [Fig. 4].
Fig.
4
Mounting: 488-04062-002 (left) and 488-04062-006 (right)
In other respects, the arrester must be installed at site in accordance with local conditions.
Earthing
To ensure safe, reliable function of the arrester and optimal protection, earthing must be effective (low
earthing resistance, short earthing connection).
For earthing purposes the bottom flange of the surge arrester is equipped with one M12 bolt. So as
not to reduce the protection level of the arresters the earthing connections should be as short and
straight as possible. (Take account of the minimum cross-section of the conductor).
© Siemens AG • 08/2016 9
Fig.
5
Earthing
Terminal
For the connection between phase and surge arrester there are the following possibilities:
1xM16 threaded hole and 2xM12 threaded holes [Fig. 6]
Flat terminal (stainless steel) [Fig. 7]
Fig.
6
Possible connections: central M16 threaded hole and 2xM12 threaded holes
Fig.
7
Flat terminals: 488-04061-001 (left) und 488-04061-002 (right)
Pay attention to the electrochemical compatibility of the materials utilised.
10 © Siemens AG • 08/2016
Maintenance
Warning
Before any work starts:
switch off and isolate
secure against reclosing
verify that equipment is dead
earth and short circuit the equipment
cover or fence off nearby live parts
Death, severe injury and considerable damage to
property and environmental damage may result if
the safety instructions are not followed.
Confirm that these safety measures have been carried out.
For technical reasons the silicone sheds do not need cleaning. Should they nonetheless be cleaned,
only use clear or soapy water and a soft cloth or sponge.
Important
Do not use solvents or abrasive or scratching materials.
Regular maintenance of the arresters is not necessary.
The only monitoring required is to:
Read the operations counter, if installed.
Check the tell-tale spark gap, if installed.
The arc effects due to overloading cause a controlled cracking or tearing open of the silicone
housing (blackening traces). In such a case you will need to replace the arrester. You may also
need to replace any monitoring accessories.
© Siemens AG • 08/2016 11
Disposal of arrester and arrester accessories
Surge arresters and the accessories are an environmentally compatible product. In disposal, priority
must be given to reuse of the materials. Environmentally acceptable disposal of the surge arresters
and the accessories is possible in line with current legislation.
The following materials have been used to make up the device: Steel, copper, aluminium, PTFE, cast
resin or cast-resin-impregnated fabric, glass-fibre-reinforced plastics, polyurethane, rubbers for seal-
ing, ceramics, electronic components and silicone rubber (VMQ), ceramics (porcelain, metal oxide).
The device can be recycled as mixed scrap, or, if it is dismantled as far as possible, in a more envi-
ronmentally acceptable way as sorted scrap with a mixed-scrap residual portion. The arrester resistors
of metal oxide (MO) should be disposed of as industrial waste similar to domestic garbage (not as
building rubble).
In as-supplied-by-Siemens state, the device incorporates no hazardous substances in the sense of the
pertinent regulations in Germany. If the device is to be operated outside Germany, the locally applica-
ble laws and regulations must be followed.
Local customer support offices will be able to answer any questions concerning disposal.