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Pantograph Disconnector for a Vertical Current Path Contact System

IP.com Disclosure Number: IPCOM000204170D
Publication Date: 2011-Feb-17
Document File: 2 page(s) / 86K

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Abstract

Disconnect switches are important components of high-voltage technologies. Their main task is to guarantee a galvanic isolation in the electrical circuit. A typical disconnect switch, which is mainly used in air-insulated high-voltage installations, is the pantograph disconnector. It produces a vertical isolation distance and is often used because of its space-saving construction and its clear design. The shears of a pantograph disconnector can be retracted and extended by an integrated drive for opening or closing a high voltage circuit. For future development, it is important to develop a design of a pantograph disconnector which leads to a low cost product. This involves reduction of material and process cost as well as standardization of parts in order to improve in quality.
At present, design solutions for vertical pantograph disconnectors are used, which involve a complicated and delicate assembly process. This is due to special profiles like multi-contact electrical connectors and special processes like copper coating on aluminum, followed by a silver coating. A state of the art pantograph disconnector consists of a large number of components. Many of them are current link members like the moving arms and are needed for current transfer. Thus, the higher the amount of link members, the more transfer contacts are required. The current transfer is realized through conical roll-contacts which channel the current and allow for arm movement. Moreover, the air clearance between the phases in an open circuit condition is a critical aspect of a pantograph disconnector which can lead to dangerous flashovers. Additionally, the state of the art design requires a base frame, which accommodates the TOM (Top Operating Mechanism) and insulator base mounting plate. The state of the art pantograph design is depicted in principle in figure 1.

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Pantograph Disconnector for a Vertical Current Path Contact System

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smit rotary motion from the nsulator while opening and mmon disconnect switches. Moreover, other components for the proposed pantograph disconnector design can also be standardized for both 245kV and 420kV, The new design of the pantograph is depicted in principle in figure 2.

The advantages of the proposed solution are among others that because of the braided flexible connectors, the contact security for a pantograph disconnector is increased. Additionally, the manufacturing process of copper coating of aluminum is eliminated which reduces production cost and time. The reduction of transfer contacts also reduces costs and increases productivity of the manufacturing process. Moreover, standardizing components for the proposed pantograph disconnector leads to less inventory and improved quality.

© SIEMENS AG 2010 file: 2010J23808.doc page: 1

Idea: Ramamurthy Palakurthy; IN-Hyderabad, Syed Jaweed Ikram; IN-Hydera

Disconnect switches are important components of high-voltage technologies. Their guarantee a galvanic isolation in the electrical circuit. A typical disconnect switch, wh
in air-insulated high-voltage installations, is the pantograph disconnector. It produce isolation distance and is often used because of its space-saving construction and its clea shears of a pantograph disconnector can be retracted and exte
or closing a high voltage circuit. For future development, it is important to d
pantograph disconnector which leads to a low cost product. This involves reduction process cost as well as standardization of parts in order to improve in quality.

At present, design solutions for vertical pantograph disconnectors are used, which involve a complicated and delicate assembly process. This is due to special profiles like multi-conta connectors and special processes like copper coating on aluminum, followed by a s
state of the art pantograph disconnector consists of a large number of components.
current link members like the moving arms and are needed for current transf
amount of link members, the more transfer contacts are required. The cu
through conical roll-contacts which channel the current and allow for arm moveme clearance between the phases in an open circuit condition is a critical aspect of a disconnector which can lea...