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PANTOGRAPH DISCONNECTOR COMPRISES

Products

a. Trapeze contact	e. Operating Rod Insulator
b. Scissor Assembly	f. Support Structure
c. Main Frame Assembly	g. Operating Mechanism
d. Support Insulators	h. Interlocks

A. TRAPEZE CONTACT

The trapeze contact consists of a silver plated copper tube suspended by adjustable dropper rods, quadruple or twin spacers, which are connected to upper quadruple or twin ACSR conductor bus. The complete assembly of sets of spacers, two Aluminium dropper rods and one silver plated copper tube totally form the Trapeze contact of Pantograph Disconnector.

B. SCISSOR ASSEMBL

The scissor assembly contains the four point contacts of silver plated copper which makes contact with the suspended copper tube of this trapeze assembly. The copper contacts are mounted on the Aluminium alloy extrusions assembled in the form of a scissor. Current transfer contacts are provided at the joints to ensure smooth transfer of current from one moving part to the adjacent part. The scissor arms on one side has counter balance springs to ensure smooth operations. Current transfer contact consists of a male copper contact on one side and female contact finger assembly on the opposite side. Corona rings are provided on the scissor assembly at the upper contact point and also at the joints in the scissor assembly.

C. MAIN FRAME ASSEMBLY

Main Frame assembly consists of the main frame of the Pantograph Disconnector on which the pantograph scissor are mounted. This assembly also has the terminal pad at either end for connecting the terminal connectors. The terminal pad is a plate of aluminium alloy with four holes drilled on it for fixing the terminal connector.

The main frame assembly also has the base plate for mounting it on top of the solidcore support insulator. It also houses the bell Crank and levers connected to the down operating rod insulator for the operation of the Disconnector.

D. SUPPORT INSULATOR

The support insulator is a soildcore insulator which is primarily used to support the metallic pole of the Pantograph Disconnector and also to provide the required insulation between the live parts and ground. An insulator corona ring is provided on top of the insulator. The lower portion of the support Insulator is mounted on to the support structure column.

E. OPERATING ROD INSULATOR

While the support insulator explained earlier gives the necessary rigid support for the metallic part (main frame assembly and scissors), the operating rod insulator is used primarily for operating the pantograph scissors and for providing insulation for the person operating the Pantograph. This Insulator is also normally a solidcore insulator of lesser diameter and cantilever strength when compared to the support insulator. The upper end of the insulator is connected to a bell crank for operating the disconnector and the lower end is connected to the operating mechanism through a down operating pipe.

F. SUPPORT STRUCTURE

Wherever specified, support structure of tubular types with necessary foundation bolts can be supplied. Plates are welded on to this tubular support structure fabricated out of welded sheet steel for mounting the operating mechanism boxes. Operating mechanism is mounted on to the structure on three plates being bolted with three angles provided on the mechanism box. The height of this support structure can be varied to accommodate the height of Upper and Lower bus heights as required by the purchaser's layout and system.

G. OPERATING MECHANISM

Normal Drive for Pantograph Disconnector are Motorised Operating mechanism, with Manual operating provision for Emergency.

H. INTERLOCKS

The following interlocks are provided for the Horizontal centre break disconnectors.

A Mechanical constructional interlock between the Main and earth switch.

An electro-mechanical castell key type interlock between Disconnector and earth switch where earth switch is specified.

Electro mechanical castell Key Interlock between electrical and manual operation in motor operating mechanism.

Further Terminal are Provided in the electrical control circuit of the motor operating mechanism for customer to wire in external interlocks.

NOTE :

Pantograph disconnector can be supplied by us with or without Earth switches. Earth switches where supplied are mounted an adaptor fixed to the support structure.

In case Pantograph Disconnector with double earth switch are required, we can offer pantograph disconnector with single earth switch additional separately mounted busbar earth switch.

Pantograph type disconnectors are generally single pole operated disconnectors and can be electrically ganged to ensure three pole operation of the disconnector.

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