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INTRODUCTION
Pentagon switchgear manufactures Outdoor type double break centre rotated Air break isolators which are structure mounted, Easy
to install from 11KV to 245KV systems.
The Isolator Consists of Three Phases and each phase has Three insulator posts. The fixed contacts are mounted on to the end
insulator posts and tube (Moving contact) on to the centre rotating stack. All the three phases are ganged on a common operating
mechanism for simultaneous closing and opening operation.It is suitable for direct connection to over head supply lines.
TYPE OF ISOLATORS
MOVING AND FIXED CONTACTS:
The fixed contacts are made up of hard drawn electrolytic high conductivity copper strips and silver plated. The contacts are designed
with “Reverse Loop” jaw controlled by powerful springs for achieving high contact pressure after the moving contacts are fully closed.
The reverse loop is adopted to ensure maximum dependability under short circuit condition.
The moving contacts are made up of hard drawn electrolytic high conductivity copper tubes with the ends are silver plated. The tube
rotates freely on the insulator posts and the contact pressure is developed by its axial rotation and this is achieved directly from the
rotating insulator posts through a lever and thus making the construction very simple.
EARTHING SWITCHES:
Earthing switch can be supplied for mounting as an integral part of the isolator and these earth switches are mechanically interlocked
with the main Isolator.
BASE:
The mounting base for each phase is robust in construction and are Hot-Dip galvanized. The outer insulator stacks and the rotating
Insulator stacks are mounted on this base structure.
TERMINAL PADS / INSULATORS:
Terminal pads of the isolator are made out of Copper / Aluminum flat projects out in the centre of the fixed contact acts to keep the insulator
stacks of the isolator in line with the bus bar support.
Porcelain Insulators used are of reputed makes only, meeting the requirement of cantilever strength, creepage distance and insulation
levels.
ARCING HORNS:
OUTDOOR DOUBLE BREAK ISOLATORS
33KV OUTDOOR ISOLATOR 11KV OUTDOOR ISOLATOR
Range : 11KV to 245KV
Installation : Outdoor
Model : Double Break Centre rotated Air Break Isolator
Mechanism : Banging / Turn & Twist
Mounting : Horizontal
Isolators are equipped with Arcing horns for breaking the magnetism current of transformers. They are of “make before” and “Break After”
type and these are capable of breaking the magnetizing current of transformer up to 7 Amps.
TM
SALIENT FEATURES
Fully type Tested as per IS-9921-1985 and IEC 60129.
High contact pressure
Strong wiping action of the fixed contacts jaws during closing
operation to clear dirt and oxides at every operation
Negligible maintenance
High electrical and mechanical life
More reliable
Robust in construction and easy to operate
TESTS :
Isolators are Type tested as is 9922 in recocoginised aborories such as CPRI, ERDA, etc. Routine test are Conducted in our factory as per is 9921
ISOLATOR TECHNICAL SPECIFICATION (WITH AND WITHOUT EARTH)
Rated Voltage (KV) 11 22 33
Maximum Operating Voltage (KV) 12 24 36
Continuous Current (Amps) 200/400/800/1250 200/400/800/1250 400/800/1250
Dynamic Current (KA) 20/62.5/62.5/62.5 20/62.5/62.5/62.5 62.5/62.5/62.5
Short Time Withsand Current (KA) 8/25/25/25 8/25/25/25 25/25/25
Magnetizing Current (KA) 7 7 7
Line Charging Current (Amps) 6.3 6.3 6.3
Operation Manual/Motor Manual/Motor Manual/Motor
Type Banging/Turn & Twist Banging/Turn & Twist Manual/Motor
Rated Voltage (KV) 110 230
Mazimum OperatingVoltage (KV) 123 245
Continuous Current(Amps) 800/1250 800/1250
DynamicCurrent(KA) 62.5/79 62.5/100
Short time Withstand Current(KA) 25/31.5 25/40
Magnetizing Current(KA) 7 7
Line Charging Current(KA) 6.3 6.3
Operation Manual/Motor Manual/Motor
Type Banging/Turn & Twist Banging/Turn & Twist
NOTES :
Manual Operating mechanism
Hand lever operated
Electro-Mechanical Interlock
> B.O.M / M.O.M. Boxes will be Supplied on specific reqirement
> We Manufacture other rating of isolators based on customer needs.
> Insulators made by the reputed firms will be used
Types of Mechanism
Isolators can be supplied with the two types of mechanism.
Provision for pad Locking
Snap action Aux. Contacts for customers use.
Motor Operating Mechanism
Motor Coupled with a reduction worm gear to increase the output torque
Electrical interlock between breaker and isolator
Fool proof mechanical interlock between isolator and earth switch.
Local / Remote control facility
Manual operation in emergency
Provision for pad locking
Snap action Aux. Contacts for customers use
DUE TO CONTINUOUS IMPROVEMENT IN DESIGN CHANGE OF PRODUCTS AND DIMENSIONS ARE INEVITABLE