High Voltage Products
Our high voltage products have short commissioning times. They are reliable, have a long service life and are also extremely earthquake resistant and weatherproof. We focus on our customers' desire for economy, safety, reliability and availability and we provide you with a global service.
The technology in our products sets international standards. We constantly ensure the high quality of our products through optimized production processes, constant product development and a certified quality management system.
- Circuit-Breaker:
Siemens manufactures EHV SF6 Outdoor Breakers at their modern factory in Aurangabad (Maharashtra). The design of these Breakers is exactly same as the design of the Circuit Breakers currently being manufactured at Siemens AG’s factory in Germany for the global market. We also confirm that our manufacturing processes and setup is in line with Siemens AG’s recommendations.
Siemens has one of the largest research and development facilities in the world. Their expertise and technical know-how is now available to Indian customers through the Aurangabad works of Siemens Ltd.
The Breaker types 3AP are available up to 800 kV and they have an extremely simple and totally maintenance free spring energy stored mechanism.
This Circuit Breaker utilizes interrupters based on self-compression principle, requiring extremely small drive energy. Siemens patented the interrupters based on self-compression principle in 1970’s. The benefit of these interrupters gets translated into a reliable and simple drive mechanism and substantially reduced stress on links and other mechanical parts of the Breaker.
These Breakers therefore are many times more reliable as the forces developed during operation (Closing / Tripping) are far less adding to the reliability and simplicity.
The advantages of 3AP SF6 breaker can be summarized as follows: o Spring energy stored mechanism: Simple, reliable and maintenance free. No need of maintenance of compressors, filters, air / hydraulic system and associated auxiliary equipment and piping.
• No expenses on installation and maintenance of compressor, air reservoirs and no recurring expenses on the power consumption on these devices. The Circuit Breakers offered by some of the other manufacturers which have a pneumatic operating mechanism are outdated worldwide.
• Convenient positioning of devices like spring charging handle, push buttons, and pressure gauge etc. The operating mechanism/control cubicle is mounted at a convenient location; access to the Breaker mechanism is easier.
• Aluminum alloy mechanism housing is not only light in weight but extremely strong ensuring a long corrosion free life. At the same time no alignment or adjustments are required at site or after many years of operation.
• Special gas sealing: Siemens Breaker has provision of very special sealing at the bottom corner gear of the interrupters. This eliminates accidental gas leakage. Use of superior manufacturing techniques, material & assembly in a dust free atmosphere ensures that there is no accidental gas leakage from the Breaker.
• The Breakers are successfully type tested as per IEC 62271-100 (2001-05) with adverse duties C2, M2
• The Breaker utilizes advanced manufacturing techniques and features such as anti-vibration latches and load-free decoupling which guarantee a very long, trouble free and reliable operational life.
• The SF6 Density monitor is ambient temperature compensated. This feature is missing in many other local suppliers.
• This breaker is easy for installation. The operational and maintenance manual is self-explanatory.
more - Disconnector & Earthing Switches:
Siemens- Elpro disconnectors are based on proven designs and know-how backed by over three decades of experience gained in this field. The integrated facility for design, manufacture and testing of Isolators at Hyderabad, the largest of its kind in India produces double break, centre break and pantograph isolators and maintenance earth switches upto 420KV/3150A. Siemens combines its vast experience and elpro’s acquired expertise to manufacture earthing switches and drive mechanism boxes.
Siemens/Elpro disconnectors can be provided with motor or manual operating mechanism depending on the customer requirement and have been type tested at Central Power Research Institute (CPRI) - the largest independent test house in the country having a tie up with CESI Italy.
Benefit of Siemens Disconnector:
• Reliable for SCADA System
• Qualified, trained Service team for site supervision of erection, testing & commissioning
• Quick installation in the field with minimum on-site assembly work.
• Easy alignment & prevention of misalignment
• Built in over centre device to prevent accidental opening while in service
• Spring less contact & sliding contact design in double break Isolator for elimination of contact erosion
•o Minimal wear & tear of the components due to less friction by providing friction free pivot points and thus increased operating efficiency and life of the equipment.
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- Instrument Transformers:
SIEMENS offers most reliable, maintenance free Instrument Transformers with unmatched safety for Extra High Voltage in India ranging from 72.5 V to 800 kV, based on the technology of Trench – a world renowned Instrument Transformer manufacturer; now an integral part of Siemens globally.
The CT, EMVT and the Combi units are based on the state of art SF6 gas technology for Internal Insulation and Shatter proof Silicone composite Insulator for external insulation.
Some of the benefits offered by them are:
• Explosion Proof design & No risk of fire – Unmatched safety
• Completely maintenance free – Freedom from capacitance & tan delta measurements and routine cleaning of Insulators
• Insulators with Hydrophobic properties – suitable for highly polluted atmosphere with lower Creepage distance requirement.
• Superior Seismic Performance
• Single Stage EMVT assuring better accuracy.
The range of instrument transformers offered by us covers:
• SF6 insulated Current Transformer (CT) with Silicone Composite Insulator
• SF6 Electro-Magnetic Voltage Transformer (EMVT) with Silicone Composite Insulator
• Combined Current and Potential Transformer (Combi Unit)
• Capacitor Voltage Transformer (CVT)
• Capacitor Voltage Transformer
The CVTs are of compact design with Oil Insulated Paper technology and porcelain insulator. The base tank and all metal flanges are made of leak-proof Aluminium alloy casting. The special Synthetic Oil used in Capacitor Stack enhances the electric stress handling capacity of the CVT enhancing the life of elements and reliability.
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