Disconnectors and Earthing Switches 36 kv up to 800 kv

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1 Power Transmission and Distribution Disconnectors and Earthing Switches 36 kv up to 800 kv

2 Ruhrtal & Siemens: A strong and successful team We manufacture high quality high-voltage disconnectors and earthing switches for outdoor and indoor substations. We provide our customers with technically and economically optimised solutions with our extensive product range of high-voltage switchgear and associated service performance. The reliability of our disconnectors and earthing switches over many decades is ensured by the comprehensive testing system and a quality control system certified according to DIN EN ISO Our experience and performance Most modern production technologies and investments in our production sites world wide ensure sustained product and process quality in accordance to the world renowned high standards of Siemens. Our products are based on the highest standard, even during the development stages. All switchgear are designed for high mechanical loads. Static terminal loads of at least 1500 N are our standard. 10,000 switching cycles, i.e. 20,000 switching operations have been verified in mechanical endurance tests. High-voltage switchgear from Ruhrtal is operating satisfactionelly and proven again and again in more than 50 countries world wide, in all geographic climatic zones. Your advantage Ruhrtal disconnectors fulfill the customer s requirements for low life cycle costs at the highest availability and continuous economic service by: delivery of completely routine tested and pre-adjusted assembly groups, easy erection and commissioning, maintenance free bearings and contact systems, comprehensive service available at short notice and life-time technical support. With over 80 years of experience in high-voltage engineering, Ruhrtal is one of the worldwide leading manufacturers of high-voltage disconnectors and earthing switches. The technology of our products set an international trend. Our extensive product range fulfils the demands of our customers` needs for highest product quality and reliability at competitive prices. Since 2001 the Ruhrtal GmbH & Co. OHG belongs to the Siemens group. High-voltage disconnectors and circuitbreakers from a common source provide our customers throughout the world with competitive advantages which equates to greater success for their own business. Disconnectors from Ruhrtal are successfully in operation throughout the world under the most severe environmental conditions and special technical requirements. 2

3 Ruhrtal Product Range U r I r I k Centre Break Disconnectors D BF 72,5 kv kv 1250 A A 31,5 ka...63 ka U r I r I k U r I r I k Pantograph Disconnectors P RF 123 kv kv 3150 A 50 ka P RL 245 kv kv 3150 A A 63 ka...80 ka U r I r I k Vertical Break Disconnectors H BF 123 kv kv 1250 A A 31,5 ka...63 ka Double Side Break Disconnectors Z BF U r I r I k 36 kv kv 1250 A A 31,5 ka...63 ka U r I r I k Knee-type Disconnectors G BF 123 kv, 550 kv 1250 A A 31,5 ka...63 ka Earthing Switches AE / BE / ME Built-on earthing switches Free-standing earthing switches Neutral point earthing switches All types of disconnectors and earthing switches are available for a temperature range from -50 C up to +50 C and for ice loads up to 20 mm. They also ensure reliable operation in areas subject to earthquake hazards. Special types of disconnectors can be provided for direct current transmission systems with rated voltages up to 800 kv. 3

4 Ruhrtal Centre Break Disconnectors The centre break disconnector is the most frequently used disconnector type. The switch base (1) carries the operating mechanism (2) and two rotatable seated supporting insulators (3). The current path arms (4) which are fixed to the insulators open in the centre. Each rotating unit (5) comprises two high-quality ball bearings and is designed for high mechanical loads. They are lubricated and maintenance-free for the entire service life. The current path of the centre break disconnectors from Ruhrtal consists of few components, thus the number of contact resistances is reduced to a minimum. In the contact head (6) the current is transferred from the terminal palm (8) to the current path tube (9) by high-flexible copper leads (7). The bearings are not loaded by current flow. The copper leads guarantee the smooth running of the bearings at the high-voltage terminal palms. The high voltage conductors remain in their position during the switching operation. The main contact system consists of block contacts and spread contact fingers. Ruhrtal contact systems guarantee a steady contact force even after years of operation. The modular design of the Ruhrtal centre break disconnectors offers various possibilities to adapt the switchgear to changed requirements in substations, even while the units are in service: Modification from side-by-side into in-line arrangement or vice versa Upgrading for higher rated continuous currents and short-circuit ratings Later installation of earthing switches Modification from earthing switch 1 to earthing switch 2 or vice versa Centre break disconnector Current path for 2500 A with copper leads in the contact head 4

5 Ruhrtal Pantograph Disconnectors The illustration on the right shows the main components of the pantograph disconnector: Scissors arms (1) Bearing frame (2) Support insulator (3) Rotating insulator (4) Motor operating mechanism (5) Rotary contact systems inside the joints, which have thermal and dynamic current carrying capacity, are used for current transfer. The geometry of the pantograph ensures optimum operational behaviour. The smooth movement during the switching operation is characteristic for Ruhrtal pantograph disconnectors. The specific contact force is already adjusted in the factory and remains unchanged during the entire lifetime. Ice loads up to 20 mm can be broken without difficulties. In both end positions of the disconnector the rotary arm in the bearing frame is switched beyond the dead centre point. The switch position cannot be changed by external forces. The rigidity of the scissors arms prevents opening during a short circuit. Ruhrtal pantograph disconnectors with rated voltages from 123 kv up to 362 kv can be equipped optionally with group operating mechanism or single pole operating mechanisms. For higher rated voltages all pantograph disconnectors are equipped with single pole operating mechanisms Components of the pantograph disconnector 5

6 Ruhrtal Vertical Break Disconnectors The current path of the vertical break disconnector opens vertically and thus makes small phase distances possible. The current path performs two movements: a vertical swinging movement a rotary movement around its own longitudinal axis. The rotary movement generates the contact force and breaks possible ice coatings. In both end positions the rotary arm is switched beyond the dead centre point. This locks the current path short circuit proof in the CLOSED position and prevents the current path from getting out of the OPEN position under external forces. The huge distance between supporting insulator and rotating insulator ensures dielectric strength of the parallel insulation even under severe salt fog conditions. The movable part of the current path is one single subassembly which is pre-adjusted and individually tested in the factory. This allows easy and quick installation and commissioning on site. Vertical break disconnector 6

7 Ruhrtal Double Side Break Disconnectors Double side break disconnector - swinging and rotary function The double side break disconnector has 3 supporting insulators. The centre supporting insulator is seated on a rotating unit and carries the current path. The two outer supporting insulators carry the fixed contacts. The main application of the double side break disconnectors is in substations with limited phase space and where vertical opening of the current path is not possible. For voltage levels up to 245 kv the contact fingers of the double side break disconnectors are attached to the current path tube, and the fixed contacts consist of contact blocks. The current path performs a swinging movement, and the contact force is generated by spreading apart the fingers when sliding on the contact block. For voltage levels higher than 245 kv contact strips are attached to the ends of the current path tubes. The contact fingers are part of the fixed contacts. In this design the current path performs a combined swinging and rotary movement. Only after completion of the swinging movement the contact force is generated by rotation of the current path round its own axis. The Ruhrtal product range also comprises of load break disconnectors for the voltage levels from 72.5 kv up to 245 kv. They are suitable for switching low currents, for instance magnetising currents of unloaded transformers. Double side load break disconnector 7

8 Ruhrtal Knee-Type Disconnectors This disconnector type has the smallest space requirements in horizontal as well as in vertical direction. Ruhrtal 123 kv knee-type disconnectors are mainly used for indoor substations. Typical arrangements are wall or ceiling mounting. In 550 kv outdoor substations Ruhrtal knee-type disconnectors are in most cases utilised as overhead line disconnectors. The knee joint in the main current path reduces the space for vertical opening and increases the distance of the opened disconnector to adjacent substation equipment. Knee-type disconnector Knee-type disconnector (wall mounted), CLOSED position 8

9 Ruhrtal Earthing Switches The use of Ruhrtal earthing switches ensure absolute de-energisation of high-voltage components in a circuit or switchgear. Ruhrtal free-standing earthing switches are available for all voltage levels up to 800 kv. Suitable built-on earthing switches are available for all disconnector types of the Ruhrtal scope of supply. According to the requirements Ruhrtal built-on earthing switches can be arranged laterally or in inboard arrangement with respect to the position of the main current path of the disconnector as needed. Optionally, all earthing switches can be designed for switching induced inductive and capacitive currents according to IEC , Class A or Class B. Three-pole centre break disconnector with two earthing switches in inboard design Red coloured: Earthing switch 1 Blue coloured: Earthing switch 2 Free-standing earthing switch 9

10 Ruhrtal Contact Systems The Ruhrtal contact systems have proved their reliability in decades of service. Following a summary of the most important features of the Ruhrtal contact systems: They consist of only a few parts The contact fingers are self-resilient, requiring no spring elements to generate the contact force The contact force is set in the factory and remains stable throughout the lifetime The contact force increases in case of a short circuit No re-adjustment is required during the service life Ice layers up to 20 mm can be broken without difficulties The AgC contact surface provides highest conductivity and at the same time serves as dry lubrication, requiring no regular grease lubrication The contacts are maintenance-free for 20 years Contact system of a centre break disconnector Ruhrtal Commutating Contacts Ruhrtal commutating contacts can be delivered for all types of disconnectors. Such busbar disconnectors are capable of switching commutating currents when changing busbars. During the switching operation from busbar 1 to busbar 2 a potential difference appears which causes a switching arc between the contacts of the disconnector. Annex B of IEC describes the switching loads appearing during non-interrupting bus transfer. Ruhrtal commutating contact systems have been type-tested with 100 C-O cycles. Commutating contact of a centre-break disconnector 10

11 Technical Data of Ruhrtal Commutating Contacts Commutating Contacts according to IEC Annex B (former IEC 1128) for Ruhrtal disconnectors Disconnector Pantograph Centre Break Double Side Break Vertical Break Ruhrtal type P RF / P RL D BF Z BF H BF Commutating contact type KK DKK ZKK HKK Commutating current (A) Recovery voltage (V) V (U r <245 kv) 300V (U r 245 kv) Number of operating cycles Rated voltage of disconnector (kv) Commutating contact of a pantograph disconnector Commutating contact of a double side break disconnector 11

12 Ruhrtal Motor Operating Mechanisms More than 50,000 Ruhrtal motor operating mechanisms in world wide operation prove their reliability around the clock. Our customers appreciate their high quality for decades. The Ruhrtal motor operating mechanisms consist of three main subassemblies: Aluminium casted housing with door (1) (protection degree IP55) Gear unit (2) with motor Electrical equipment with auxiliary switch (3). The motor operating mechanism can also be operated manually. For this purpose a hand crank is inserted into an opening easily accessible from the ground. The opening is secured by a swivel-mounted shutter. Opening the shutter automatically interrupts the motor and control circuit, protecting the site personnel against inadvertent operation of the high-voltage switchgear by remote control. The electric motor brake makes manual operation by hand crank easier. For maintenance work the operating mechanism can be blocked additionally by a mechanical interlocking device. The Ruhrtal motor operating mechanism is protected against condensation water by a heating resistor and the air circulation inside the housing Motor operating mechanism Auxiliary switch The Ruhrtal auxiliary switches consist of creepage proof and arc-resistant moulded plastic discs. Putting one on the other they build closed interrupting chambers. The self-cleaning contacts consist of silver-plated contact knives and contactbridges fitted with solid silver elements. They are able to carry and switch very small signalling currents as well as higher inductive direct currents. The Ruhrtal auxiliary switch is form-fit connected to the gear unit and signals the switching position with absolute reliability. This ensures safe substation operation. After motor starts the auxiliary switch moves and the switching position signal is cancelled. The disconnector operates thereafter until the end position is reached. Only then the auxiliary switch moves again and issues the switching position signal. This sequence ensures that the CLOSED position is indicated only after the disconnector is locked short-circuit proof and the rated current can be carried. The OPEN position is indicated only after the opened current path has reached the nominal dielectric strength. Ruhrtal s auxiliary switches are also testifying their reliability in operating mechanisms of circuit breakers and disconnectors from other manufacturers. Further quality advantages of the Ruhrtal motor operating mechanisms are: Generously dimensioned housing with large cable connecting space The Ruhrtal motor operating mechanisms are particularly easy to install and maintain The door hinge side can be changed The operating mechanism can be mounted with the door closed The first maintenance overhaul is required after 1,000 switching operations 12

13 Ruhrtal disconnectors and earthing switches for most precise technical requirements Ruhrtal 245 kv high-voltage disconnectors are in operation at the KEMA test laboratories with ratings of 400 ka peak current and 160 ka-1 s short time current. Ruhrtal 150 kv disconnectors and earthing switches are in operation at the independent PEHLA high power testing station of Siemens AG in Berlin. They have ratings of 400 ka peak current and 160 ka-1 s short time current. High voltage direct current transmission systems with rated voltages of 412 kv and 550 kv utilise Ruhrtal double side break disconnectors with the verified switch-on current of 100 A rms. Ruhrtal earthing switches with making capability can discharge unloaded high voltage cables for 420 and 550 kv with cable lengths of up to 300 km. Simover compact switch bay Innovative technology of Ruhrtal Ruhrtal double side break disconnectors with integrated surge arrester of Siemens AG; suitable are both arresters optionally with porcelain or composite insulators Ruhrtal earthing switches with rated voltages up to 550 kv for the extinction of ferro-resonance currents Ruhrtal double side load break disconnectors with capacitive and inductive breaking capability of 10 A at 145 kv rated voltage for the Chinese State Railways Ruhrtal earthing switches with vacuum arcing chamber for switching induced currents up to 400 A Ruhrtal earthing switches mounted on Siemens dead-tank circuit-breakers Simobreak compact switch bay 13

14 For further information Please send this page by fax to the following number: Fax or send us an to: Name Position Company Street Postal code/city/country Telephone/Fax Subject RUHRTAL GmbH & Co. OHG Hohensteinstraße 16 D Bochum-Wattenscheid Germany Tel Internet: The information in this document contains general descriptions of the technical options available, which do not always have to be present in individual cases. The required features should therefore be specifi ed in each individual case at the time of closing the contract. Subject to change without prior notice Order No C Printed in Germany

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