Siemens 3EL2 Manuale utente

Siemens Aktiengesellschaft

Surge Arrester Type 3EL2

Operating instructions Order-No.: 928 00047 176

The copying, distribution and utilization of this document as well as the communication of its

contents to others without expressed authorization is prohibited. Offenders will be held liable

model or ornamental design registration.

2© 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

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:[email protected]

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 condi-

tion 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 • 07/2003

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]:

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 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 MO resistors are tightly enclosed by the GRP rods (as if in a cage). In the event of resistor over-

load – 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 consider-

able 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 current-

voltage characteristic, which means that with the continuous voltage obtaining under normal circum-

stances 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.

6© Siemens AG • 07/2003

1 Polymeric composite housing

2 Non-linear metal-oxide resistor

3 Insulating rods

4 Flange

Fig. 4 Sectional view of a modular unit

Transportation and storage

The modules of the surge arrester are packed in boxes or crates in the factory in accordance not only

with the stresses and climatic conditions they will encounter during shipping. but also with the require-

ments of the customer.

The packaging will have the appropriate transportation and storage labelling as well as instructions on

proper handling.

The consignment should be inspected immediately after receipt for signs of damage. If damage is

found the carrier should be informed without delay. Loose parts packed with the consignment should

be checked against the dispatch note to make sure none is missing. This means that all shipping con-

tainers will need to be opened.

If the items are to be stored for extended periods, we recommend you leave the modules and accesso-

ries in their shipping containers.

All of the screws, terminals and supplementary equipment (tell-tale spark gap, surge counter) required

for assembly and installation are supplied in an accessory pack.

Note:

To avoid damaging the insulators, do not remove the assembly and shipping protector

until assembly and installation has been completed.

1 Polymeric composite housing

2 Protective packing for installation/transport

Fig. 5 Protective packing for installation/transport

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 to or loosing of bolt

joints

Use torque wrench for assembly.

Necessary torque for screwed joints:

M 8: 18 ± 2 Nm 13 ± 1.5 ft lb

M 10: 35 ± 5 Nm 25 ± 4 ft lb

M 12: 60 ± 5 Nm 43 ± 4 ft lb

M 16: 90 ± 10 Nm 65 ± 7 ft lb

M 20: 105 ± 10 Nm 75 ± 7 ft lb

8© Siemens AG • 07/2003

Installation

Important note: Note the following before installing:

Warning

Before any work starts:

Øswitch off and isolate

Øsecure against reclosing

Øverity that equipment is dead

Øearth and short circuit the equipment

Øcover 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.

ØConfirm that these safety measures have been carried out.

Accessories

With the standard model, the following accessories are included in the scope of supply:

ØGrading ring and struts (as applicable)

Possibilities for isolated installing:

Ø3-hole mounting insulated Ø200 … 276 mm [Fig. 10]

Ø4-hole mounting insulated 200 × 200 mm² with screws M16 x 130 [Fig. 11]

Ø4-hole mounting insulated 310 × 310 mm² with screws M20 x 140 [Fig. 12].

Possibilities for the terminals:

Øterminal bolt, corrosion-resistant steel [Fig. 14],

Øflat terminal, DIN, all hot-galvanised steel, [Fig. 15],

Øflat terminal, NEMA, all hot-galvanised steel, [Fig. 16].

Place of installation

The range of protection offered by the arresters is restricted, which is why the surge arrester should be

installed as close as possible to that part of the system being protected. The distance between

grounded or live components and adjacent arresters or their control components should be selected on

the basis of the relevant regulations.

Note

The arresters must be installed or suspended vertically. If they need to be installed in a

non-vertical position, you should first contact the manufacturer.

Mounting the components

The individual components for mounting are shown in the drawing in [=> on page 15].

Installing of the arrester

Attention

Danger of damage to the interior of the arrester

ØDo not lean a ladder against the surge arrester.

The contact faces of the flanges of the arresters must be cleaned with a steel brush, if necessary.

With arresters consisting of several units the units must be placed one on top of the other in the se-

quence of their numbers marked on the rating plate [Fig. 2, Fig. 3, Fig. 6].

Attention

Danger of damage to the interior of the arrester

The contact faces [4/Fig. 6] shall be cleaned before installation.

1 lower unit

2 upper unit

3 Rating plate for unit

4 contact faces

Fig. 6 Surge arrester units

Attention

Shim plates between the individual arrester units are not allowed.

Before the top unit is located in place, it is advisable to fit the outer grading ring struts [3/Fig. 17],

[4/Fig. 17] and the terminal plate [10/Fig. 17] to the upper flange.

10 © Siemens AG • 07/2003

Fig. 7 Lifting gear

Fig. 8 Drilling plan / direct mounting

standing installation

The arrester must be placed and mounted with four rag bolts M10 on a concrete foundation or with four

bolts M10 on the support [Fig. 9] by means of appropriate lifting gear (crane, tackle) comprising slings

and lifting lugs [Fig. 7].

Fig. 9 unisolated 4-hole mounting

Basic plate for isolated installation, 3 hole mounting ø200 … ø 276 mm 3× M12 (standing installation)

Attention

Do not remove the insulating tube from the bolts M12 × 140.

Put according to the drilling plan the three lower insulating sockets [Fig. 10] to the holes of the support.

The base plate and the upper insulating sockets can be mounted with three bolts M12 × 140 on the

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