8BK88PLUS Air insulated Metal-clad Switchgear with Vacuum Circuit Breaker on withdrawable truck

Construction

• 1. Single busbar air insulated metal-clad switchgear.
• 2. Circuit breaker mounted on withdrawable truck.
• 3. Simple and rugged shutter mechanism.
• 4. Encapsulated feeder connections.

Standards

• 1. IS 3427 and IS 12729.
• 2. IEC 62271-100.
• 3. IEC 62271-200.

Personnel safety:

• 1. All switching operations performed with breaker compartment door closed.
• 2. Earthed metallic partitions and shutters prevent contact with live parts.
• 3. Individual high voltage compartment tested for Internal arc fault.

Tolerance to environment:

• 1.Full metallic enclosure ensures high resistance to ingress and interference under all operating conditions.

Salient features:

• 1. No separate maintenance trolley required.
• 2. Safe and easy truck movement behind closed cubicle door.
• 3. Separately padlockable shutter for bus and cable side fixed contacts.
• 4. Automatic dropping ramp for facilitating truck removal

Optional:

• 1. Wound primary/Torroidal CTs
• 2. Withdrawble/fixed type PTs in cable chamber.
• 3. Fully type tested including internal arc fault test.
• 4. Belongs to 8BK8 series with all safety features./li>

Technical Data

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8BK88PLUS Air Insulated Metal-Clad Switchgear With Vacuum Circuit Breaker On Withdrawable Truck
Rated Voltage	12kV
Rated frequency	50 Hz
Rated short-duration power-frequency withstand voltage	28 kV*
Rated lighting impulse withstand voltage	75 kV
Rated short-time withstand current,3 s	26.3 kA
Rated peak withstand current at 50 Hz	66 kAp
Rated short-circuit breaking current	26.3 kA
Rated short-circuit making current at 50 Hz	66 kAp
Rated normal current of busbar	2000 AO
Rated normal current of feeders- with circuit-breaker	1450 A

3AH0 Vacuum Circuit Breaker The right choice for varied tasks

Construction

• 1. Light weight and compact vacuum circuit breaker consisting of three encapsulated vacuum interrupter poles and a drive mechanism housing which forms a sturdy base for poles.
• 2. Operating mechanism is of stored energy type and suitable for auto reclosing duty. It can be manual/electrical as desired
• 3. Fully integrated contact arms with tulip type contacts

Standards

• 1. IS 13118.
• 2. IEC 62271-100.

Personnel safety:

• 1. All switching operations performed with breaker compartment door closed.
• 2. Earthed metallic partitions and shutters prevent contact with live parts.
• 3. Individual high voltage compartment tested for Internal arc fault.

Salient features:

• 1. Conforms to IS/IEC standards and is fully type tested.
• 2. Simple and compact design.
• 3. Suitable for rapid autoreclosing duty.
• 4. Highly reliable operation
• 5. Suitable for all environments.
• 6. High switching capability
• 7. Matching drive and interrupter characteristics.
• 8. All type tests carried out with VCB mounted inside the panel.

Advantages of vacuum over other interrupting media:

• 1. Highest dielectric strength over a small contact gap.
• 2. Constant low contact resistance.
• 3. Fastest recovery strength.
• 3. Lowest drive energy requirements.
• 3. Minimum contact erosion.
• 3. No fire hazards or explosion risk.
• 3. VCB has least number of moving parts and hence highest reliability.

Freedom from maintenance:

• 1. Maintenance free with new generation imported vacuum interrupters.
• 2. The gear box is sealed and lubricated for life.
• 3. Free from chain snapping problem of conventional operating drive mechanism.

Environmental compatibility:

• 1. The vacuum circuit breaker has no effect on the environment during and after the switching operations

Technical Data

3AH0 Vacuum Circuit Breaker. The right choice for varied tasks
Rated voltage (frequency 50Hz)	12 kV
Rated current	upto 1600 A
Rated power frequency withstand voltage (RMS) 1 min	28 kV*
Rated lighting impulse withstand voltage (peak) 1.2/50 microsec.	75 kV
Rated short circuit Breaking current (RMS)	26.3 kA
Rated short time current (RMS) withstand (3 sec.)	26.3kA
Rated short Circuit Making current (peak)	66kA