Surge arrester 3EB1. with polymeric composite housing for operating aboard traction units

Transcription

1 Transmittal, reproduction, dissemination and/or editing of this document as well as utilization of its contents and communication thereof to others without express authorization are prohibited. Offenders will be held liable for payment of damages. All rights created by patent grant or registration of a utility model or design patent are reserved. Surge arrester 3EB1 with polymeric composite housing for operating aboard traction units Operating instructions Siemens Aktiengesellschaft All rights reserved. Siemens AG 10/2006 Order No.: a

2 Contents Description 3 Structure of order No. 3 Technical data 3 Design 4 Mode of operation 5 Transport and storage 5 Screwed joints 5 Installation 6 Place of installation 6 Disposal arrester and arrester accessories 8 Maintenance 8 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 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 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 / PTD H 51 Sales department: +49 / 30 / D Berlin Fax: +49 / 30 / 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. 2 Siemens AG 10/2006

3 Description The 3EB1 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 encountered aboard traction units. Structure of order No. 3 E B fixed position Arrester type Rated voltage 10 Ur Long duration discharge current 500 A for AC only A for AC only A for DC only 7 Standard IEC99-4 (AC) EN (AC) A D Housing size 1 shed S 2 sheds M 4 sheds 7 sheds L X High voltage terminal centre thread for M12 1 Flat connection (standard) 2 hole-circle diameter ø140 (3 ø12) ø162 (3 ø12) ø162 (3 M10) A B C Fig. 1. Order No. Technical data The standard model is suitable for the operation of up to 1800 m above sea-level and for a rated frequency between 16 2/3 Hz and 62 Hz AC (3EB1 xxx-xaxxx-xx) and DC (3EB1 xxx-xdxxx-xx) respectively. The surge arrester meets the following standards as for as applicable: Standard Classification VDE : ka IEC , Ed. 2, ka IEEE Std C EN /A1: (if applicable) VDE 0115 part 1 und part 2 Siemens AG 10/2006 3

4 3EB1 xxx-xxsxx-xx 3EB1 xxx-xxmxx-xx 3EB1 xxx-xxlxx-xx 3EB1 xxx-xxxxx-xx Fig. 2. Surge arrester type 3EB1 The rating plate [Fig. 3.] is attached to the bottom flange. s Gapless MO-Surge Arrester Type (1) Ur (2) kv Uc (3) kv f (9) Hz In (4) ka LD-CL (5) PR-CL (6) ka Dat. (7)/(8)B IEC MADE IN GERMANY AC surge arrester 3EB1 xxx-xaxxx-xx 1 Order No. 2 Rated voltage 3 Continuos operating voltage 4 Nominal discharge current 5 Long-duration discharge class Fig. 3. Rating plate s Gapless MO-Surge Arrester Type (1) Ur (2) kv DC Uc (3) kv DC Up (10) kv In (4) ka PR-CL (6) ka Dat. (7)/(8)B EN MADE IN GERMANY DC surge arrester 3EB1 xxx-xdxxx-xx 6 Pressure-relief class 7 Year of manufacture 8 Serial No. 9 Frequency (only 3EB1 xxx-xaxxx-xx) 10 Residual voltage at I n (only 3EB1 xxx-xdxxx-xx) Design The active components of the arrester are metal-oxide resistors. They are installed in an airtight sealed polymeric composite housing 1 (tube of fibre-rein-forced plastic with silicone rubber coatings [Fig. 4.]. The housing consists of 2 major components: A fibre-reinforced plastic tube to ensure high mechanical strength. If the arrester is overloaded the tube does not break. This ensures that no parts are thrown off if the arrester fails. The hydrophobic properties of the high-temperature cross-linked silicon rubber coating ensure that electrical discharges on the housing surface are kept to a minimum; particularly good operating characteristics are therefore assured even under conditions of pollution. The flanges (provided in some cases with integral gas diverter) are made of a weather-resistant light alloy and are bonded to the polymeric composite housing. UV and ozone resistant sealing rings and corrosion-resistant metal diaphragms ensure perfect sealing for years. The arrester is fitted with a pressure relief diaphragm and a gas diverter at the lower end [Fig. 4.]. In the case of an arrester being overloaded, this pressure relief diaphragm will open at a pressure amounting to a fraction of the polymeric composite housing pressure resistance. Under these circumstances the gas flow is directed onto the arcing horn attached to the upper arrester flange, and so arcing can continue outside the housing until the feeder is switched off. Due to the high permissible bending moment and the excellent mechanical strength of the housing, the arrester type 3EB1 can be simultaneously used as a post insulator in addition to its actual arrester function. The function as a post insulator is not affected by an overload of the arrester. Before it is used as a post insulator, the manufacturer must be consulted to clarify the occurring loads. 4 Siemens AG 10/2006

5 Mode of operation Metal-oxide resistors are highly non-linear, i.e. they have a sharply kinked voltage-current characteristic, with the result that below a certain voltage value only a small leakage current flows through the arrester. The arresters are so designed that under normal continuous voltage conditions only leakage current of approx. < 1mA flows. With lightning or switching overvoltages, the resistors become conductive (ohm range) so that a surge current can flow to earth and the overvoltage is reduced to the value of the voltage drop across the arrester (residual voltage). The surge currents have values of up to 500 A with switching overvoltages, and of ka with lightning overvoltages. 1 Polymeric composite housing 2 Flange with gas diverter 3 Compressing spring 4 Non-linear metal-oxide resistor 5 Intermediate plate 6 Drain hole Fig. 4. Sectional view Transport and storage Attention The surge arrester units may only be handled vertically, standing on the bottom flange. 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 handling. As soon as the shipment arrives examine it for signs of damage. If such damage is found, immediately 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. Screwed joints Grease the bolt threads with Molykote Longterm 2 plus. Siemens AG 10/2006 5

6 Attention Unchecked tightening can result in damage to or loosing of bolt joints. Use torque wrench for assembly. Necessary torque for screwed joints: M 10: M 12: 35 ± 4 Nm 45 ± 6 Nm Installation 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 With the standard model, the following accessories are included in the scope of supply: Connecting lug for earth connection 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. Attention The gas diverter should not point in the direction of another system component, so that the hot gases do not cause any damage during blow-out. Do not mount the arrester without intermediate plate [6 / Fig. 4.]. The arresters must be fitted vertically or suspended. If non-vertical installation is desired, confer with the manufacturer. 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 M10 [Fig. 5. / Fig. 6.]. 6 Siemens AG 10/2006

7 hole-circle diameter D 3EB1 xxx-xxxxx-xa: ø140 (3xø12) 3EB1 xxx-xxxxx-xb: ø162 (3xø12) Fig. 5. Mounting 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). Fig. 6. Connecting lug for earth connection Terminal For the connection between phase and surge arrester there are the following possibilities: Flat connection, aluminium [Fig. 7.] (Standard) Centre thread [Fig. 8.]. Fig. 7. Connection tag 3EB1 xxx-xxxx2-xx Fig. 8. Centre thread M12 3EB1 xxx-xxxx1-xx Pay attention to the electrochemical compatibility of the materials utilised. Siemens AG 10/2006 7

8 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. 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. Regular maintenance of the surge arrester is not required. Inspections are limited to the checking the arrester for signs of overloading (black or burned spots at the blow-out hole in the flange). In this case the arrester must be replaced. Cleaning of the silicon sheds is recommended annually or after km travelled. The arrester is resistant to the usual cleansing agents and methods used in the rail area. If it is cleaned by hand, only use clear water or soap water, and only soft cloths or sponges. Use other cleaning liquids only after consulting the manufacturer. Attention Do not use solvents or abrasive substances. 8 Siemens AG 10/2006