Siemens Aktiengesellschaft All rights reserved. © Siemens AG • 01/2004

Surge arrester 3EP4

for systems up to ≤ 362 kV Operating instructions Order No.: 928 00014 401c

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2 © Siemens AG • 01/2004

Contents

Technical data 3 Description 4 Transportation and storage 5 Screwed joints 6 Montage 6 Maintenance 11 Disposal arrester and arrester accessories 11 Exploded view 12

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.

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The 3EP4 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 3280 ft above sea-level and for a rated frequency between 48 Hz and 62 Hz. The arrester consists of 1 or 2 modular units.

Fig. 1. Surge arrester 3EP4

The surge arrester meets the following standards as for as applicable: 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).

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1 Order number 6 Pressure relief class 2 Rated voltage 7 Year of manufacture 3 Continuous voltage 8 Works serial no.

9 Module no. of arrester and additional information

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 Module no.

Fig. 3. Module plate

Description

Design The active components of the arrester are metal oxide resistors. They are arranged in one or more parallel columns and accommodated in a hermetically sealed porcelain housing with sheds of high insulation resistance [1]. The flanges with integrated gas diversion nozzles are made of a light metal alloy suitable for outdoor use and are cemented with putty to the porcelain housing. An effective seal is assured for years thanks to weather and ozone-resistant seals and non-corroding metal diaphragms. Each module is equipped at both ends with rupturing diaphragms and gas diversion nozzles. In the rare case of an overload, these rupturing diaphragms will already open at a pressure which is 20% of the pressure resistance of the porcelain housing. In such a case the shape of the gas diversion nozzles causes the gas jets to be directed towards each other, thus allowing the arc to continue burning outside the porcelain housing until the time when the line is switched out. The arresters are, where necessary, equipped with control fittings.

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 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.

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1 Porcelain housing 4 Pressure-relief diaphragm 2 Flange with gas diverter 5 Compression spring 3 Seal 6 Non-linear metal-oxide resistor

Fig. 4. Sectional view of a modular unit

Transportation and storage

Caution The arrester components should only be transported and stored standing vertically on the lower flange.

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 requirements 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 containers will need to be opened. If the items are to be stored for extended periods, we recommend you leave the modules and accessories 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.

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1 Porcelain housing 2 Protective packing

Fig. 5. Protective packing

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: 13 ± 1.5 ft lb M 10: 25 ± 4 ft lb M 12: 43 ± 4 ft lb M 16: 65 ± 7 ft lb M 20: 75 ± 7 ft lb

Montage Important note: 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 Standard accessories for standard model: � grading ring and struts (as applicable) � isolated base plate 7.87 × 7.87 mm² with bolts M16 x 5.12 [Fig. 8.]

Possibilities for isolated installing: � base plate 12.2 × 12.2 mm² with bolts M20 x 5.51.

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Possibilities for the terminals: � terminal bolt 3EX6 116 (corrosion-resistant steel [Fig. 10.]), � flat terminal 3EX6 117 (DIN, all hot-galvanised steel, [Fig. 11.]). � flat terminal 3EX6 115 (NEMA, all hot-galvanised steel, [Fig. 11.]).

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.

Important If at all possible, the expulsion aperture should not point towards any other part of the installation, in order to prevent damage caused by hot gases blowing out.

The arresters must be installed vertically. If they need to be installed in a non-vertical position, you should first contact the manufacturer. If the arresters are installed non-vertically, make sure that water can escape from the lower flanges.

Mounting the components The individual components for mounting are shown in the drawing in [=> Exploded view].

Installing of the arrester

Attention Danger of damage to the interior of the arrester � The arrows on the top flange of the arrester must always

point upwards. � Do 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 prorated units the units must be placed one on top of the other in the sequence of their numbers [Fig. 6.]. The unit with the highest number is at the top.

Attention! Danger of damage to the interior of the arrester. The plates [Fig. 6./4] must not be removed during installation.

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1 lower unit 2 upper unit 3 Rating plate for unit 4 Plate (2x)

Fig. 6. Surge arrester units

Attention Shim plates between the individual arrester units are not allowed.

Assembling begins with the fitting the outer grading ring struts [3/Exploded view], [4/Exploded view] and the terminal plate [2/Exploded view] to the upper flange.

Fig. 7. Lifting gear

standing installation

Attention Do not remove the insulating tube from the bolts M16 x 4.33.

The arrester must be placed and mounted either insulated with four bolts M16 or directly grounded with three bolts M12 x 2.76 on the support [Fig. 8.] by means of appropriate lifting gear (crane, tackle) comprising slings and lifting lugs [Fig. 7.]. The arrester must be horizontal (check with a spirit level). If necessary use shims for adjustment.

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1 Support 2 Lower insulating socket 3 Flange 4 Upper insulating socket 5 Arrester

Fig. 8. Base plate

Put according to the drilling plan the four lower insulating sockets [2/Fig. 8.] to the holes of the support [1]. The arrester [5] must be placed and mounted with four bolts M16 × 110 on the four lower insulating sockets [2] by means of appropriate lifting gear (crane, tackle) comprising slings and lifting lugs [Fig. 7.]. The flange [3/Fig. 8.] and the upper insulating sockets [4] can be mounted with four bolts M16 x 110 on the lower insulating sockets [2].

suspended installation In other respects, the arrester must be installed at site in accordance with local conditions.

Attention It is not possible to change standing installation to suspend installation!

Grounding The protective effect of surge arresters will be negatively affected with increasing length of the ground wire, since a voltage drop occurs along the ground wire during a surge event. Thus, the ground wire should connect the ground terminal of the arrester to the substation grounding system using the shortest and most direct path. The length of the ground wire, if possible, should not exceed 3 ft for medium voltage surge arresters and 10 ft for high voltage surge arresters. Even if the arrester is monitored by devices connected in series with the ground wire, e.g. by control spark gap 3EX6 040 or surge counter 3EX5 030/050, the ground wire should be as short as possible and loops should be avoided. If monitoring devices are to be installed at a larger distance from the arrester, it is recommended to use devices with separate sensors and display units, such as the surge monitor with sensor unit 3EX5 060 and display unit 3EX5 062. If monitoring devices are connected to the ground wire, the conductor between the earth terminal of the monitoring device and the grounding system of the substation must protected against contact. For installation of ground wire and monitoring devices the requirements of the corresponding national or international standards are to be applied.

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HV-Terminal

Attention High-voltage connections with tube conductors should be flexible in order to prevent exertion of any inadmissible mechanical forces on the surge arrester. Pay attention to the electro-chemical compatibility of the materials utilised.

Terminal with cable eye: The terminal must be mounted with a cable eye according to [Fig. 9.].

Fig. 9. Terminal with cable eye

Bolt terminal 3EX6 116 or flat terminal 3EX6 117 (DIN) / 3EX6 115 (NEMA): If the terminal is mounted by means of a bolt terminal [Fig. 10.] [Fig.10] or a flat terminal [Fig. 11.], [Fig. 11.], the necessary accessories are already installed by the manufacturer.

Fig. 10. Bolt terminal

Fig. 11. Flat terminal (DIN) Fig. 11. Flat terminal (NEMA)

Maintenance

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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.

Regular maintenance of the arresters is not necessary. The only monitoring required is to: – Read the operations counter (if fitted) – Check the tell-tale spark gap (if fitted) – Check the arrester for any overloads (blackening or traces of burning at the blow-out aperture of

the flange). In such a case you will need to replace the arrester – Check the level of contamination of the porcelain. (If there is marked contamination or

contamination at one end, cleaning followed by siliconizing is recommended.)

Disposal 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 sealing, ceramics, electronic components and silicon 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 environmentally 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 applicable laws and regulations must be followed. Local customer support offices will be able to answer any questions concerning disposal.

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Exploded view Pos. Quantity Designation 1 3

5/6 2/3

Screw M10 x 1.77 Washer .41 Nut M10

2 0/3 Plate 3 0/3 Strut 4 0/1 Grading ring 5 0/3

0/6 0/3

Screw M8 x .98 Washer .33 Nut M8

6 1/2 Porcelain housing 7 0/3

0/6 0/3

Screw M10 x 2.36 Washer .41 Nut M10

8 1 Rating plate 9 0/2 Rating plate for unit 10a 1 Bolt terminal 10b 1 Flat terminal DIN / NEMA 11 1 Plate 12 4

8 4 8 4 4

Screw M16 x 4.33 Washer .67 Insulating tube B.63 x .04 Insulating socket Spring washer B.63 Nut M16

13 1 Base plate 12.2 x 12.2 mm²

14 1 1 1

Screw M12 x 1.18 Spring washer B.47 Washer .51

Fig. 12. Surge arrester 3EP4