Facility is also available for hand charging the springs in the event of supply failure. The closing spring is charged by the motor in less than 15 second. Electrical anti-pumping feature is also provided.

The mechanism is trip free and suitable for rapid re-closing. The vacuum interrupters are capable of switching capacitive currents and small magnetising current.

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Salient Features

• Conforms to IS13118: 1991/IEC62277-100 IEC-62277-200.
• Fully compartmentalized & Compliance to internal arc as per standards.
• Emergency tripping arrangement without opening the Breaker chamber front door.
• Extensible & modular construction.
• High reliability.
• Re strike free.
• Horizontal draw out type.
• Self aligning type cluster contacts for robust design.
• Stored energy type spring closing mechanism.
• Fully interlocked for operational safety.

Technical Specification

Rating	Unit	AVKVCB
Symmetrical breaking capacity	KA-rms	13.1 , 20, 26.3
Rated Current	Amp	800, 800, 1250, 800, 1250
Rated Voltage	KV	12
No. of Poles	Nos.	3
Frequency	HZ	50
DC Component	%	50
Duration of short time current	Sec.	3

Panel Specification

• Indoor metal clad panel.
• Horizontal withdrawal & isolation.
• Upto 1250A rating of buabar.
• Degree of protection IP4X.
• Current Transformers of ratio accuracy as per requirement.
• 2 Nos. Space Heaters Service & Test position of CB
• IS 3427 : 1997 IEC 60298
• Rear entry for power cable 32 way plug & socket for sec contact.

Construction

Metal clad VCB cubicles are fabricated out of high quality sheet steel by sophisticated manufacturing process, Stringent in process quality checks and in house production of all critical components. The panels are dust and vermin proof and with degree of protection IP4X as per IS2147 for indoor panel.

Electricfield Switchgear Vacuum circuit breaker panel consists of 4 chambers namely

• Breaker chamber.
• Metering & relay chamber.
• Bus bar chamber.
• CT/PT (duly type tested), cable chamber.

Breaker Chamber
This consists of VCB mounted on a trolley, horizontal draw out with self aligning type moving contacts. Fixed contacts are covered automatically by movable shutters while draw out the vcb, to ensure no direct contacts with live parts is possible, thus ensuring the safety of operator.

Metering & Relay Chamber
This consists of all meters, protective relays, switches, indicating lamps etc, and wired as per the specification of the clients.

Bus Bar Chamber
The switchgear panels are provided with single/double bus bars with high electrical grade copper/Aluminum depends on the current rating. The 3 phase bus bars are supported on strong epoxy insulation and fixed delta configuration which minimized electro mechanical stresses under short circuit conditions. Bus bars ill be provided with sleeve insulation.

CT/PT (Electricfield Make), Cable Chamber
The CT/PT (Type Tested) & Cable Chamber is located at the rear side of the panel and ready access is available by opening the rear cover with safety weld mesh. It is also possible to mount core balance CTs with in the cubicle. The panels are powder coated with epoxy base paint to give an aesthetically leasing appearance. The pre treatment process is done by seven tank method. The paint shall be as per the requirement of clients.

Outdoor VCB Kiosk

Electricfield Switchgear Offers outdoor Vacuum Circuit Breaker Kiosk can be directly installed on a plinth. The power supply can be taken either through roof bushings or cable box or a combination of roof bushing and cable box. The CT/ PTs and relays are in - built in the metal enclosure.

Earthing Options
Earthing through a draw-out earthing truck with solid links on the bus/feeder side.

Interlocks

• Interlocks are provided such that breaker closing is prevented in intermediate position between service and test/isolated positions.
• Mechanical interlocks to prevent truck racking in/out when breaker is in closed position.
• Breaker can be inserted only when control plug & socket in position.
• Control plug & socket can be removed only in isolated position.
• Mechanical castle interlock with upstream/downstream isolators can be provided on request.

Testing Facilities