PARK DETROIT
19197 Sherwood Ave.
Detroit, MI 48234
Tel: (313) 366-2200
Fax: (313) 366-1540

Switchgear, Links to
Pad Mounted (PM155/PM255) | Metal Enclosed (PM315) | Metal Clad (Drawout Breaker) | 
Switchgear, Metal-Clad
Type H2 Two-High and Vacuum Circuit Breakers
(5, 7.2 and 15kV)
General

Park 5, 7.2 and 15kV class medium voltage, compartmentized, compact design, one- or two-high vacuum circuit breaker switchgear is of the metal-clad type as covered by ANSI standard C37.20. All parts are completely enclosed within grounded metal barriers. Circuit breakers are the horizontal drawout type. Secondary control devices and primary circuits are isolated from each other by shutters or barriers. Primary circuits of different potential are also separated by barriers. All primary bus work and joints are completely encased with insulation material to suit the voltage class of the equipment.

Each vertical section may contain a main bus bar section and two compartments for auxiliary devices and/or circuit breakers, with primary and secondary disconnects, instrument transformers, instruments and relays, secondary wiring and other necessary components. The switchgear is designed so that additional vertical sections with circuit breakers and/or auxiliary compartments may be added in the future.

The space saving potential of the type H2 cubicle and circuit breaker designs allows up to two drawout elements to be furnished in a single vertical section. Previous designs required twice the floor space for two 15kV, 1200 ampere feeder positions, which now can be furnished in one vertical section.
• Shelter-Clad Outdoor
Switchgear consists of indoor type circuit breaker and auxiliary cubicles located in a weatherproof steel housing having an operating aisle of sufficient size to permit withdrawal of the circuit breakers for inspection, test or maintenance. An access door is located at each end of the aisle. Single and common aisle designs are available and include a 36-inch left end aisle extension where needed for full breaker door swing.

• Non-Walk-In Outdoor
Equipment consists of circuit breaker and auxiliary cubicles located in a steel housing of non-walk-in weatherproof construction. Each compartment is equipped with hinged front door for breaker drawout and for relay access with provision for padlocking. Removable rear panels are supplied for cable access.
Features

• Closed Door/Screw Racking
Features a double-drive screw operator which may also be used when the front door is open. A position indicator, visible with the front door open or closed, indicates when the breaker is in the "disconnect/test" or in the "connected" position.

• Front Accessible Stored Energy Operator
Horizontal drawout circuit breakers allow ease of maintenance and positive operator safety in the disconnect/test and operating positions. In the disconnect/test position, the operator cover can be easily removed to expose the operator for inspection and maintenance. This feature eliminates the need to tilt or turn over the circuit breaker for normal service.

• Positive Acting Grounded Metal Shutters
Automatically operated grounded steel shutters are included to allow or block access to the stationary primary disconnects. The shutters are opened by the circuit breaker as it moves toward the connected position allowing access to the primary disconnects. Access is blocked as the circuit breaker is racked away from the connect position. For safety, the two counterbalanced shutters are designed to normally remain closed unless they are forced open by insertion of the circuit breaker. This design reduces the danger to maintenance personnel as compared to a racking mechanism operated shutter which could be opened with the circuit breaker out of the cell thereby exposing personnel to high voltage components.

• Bus Bar Insulation
Bus bars are insulated by means of a molded epoxy coating applied in a fluidized bed process. This provides a track resistant, flame retardant insulation, which is bonded to the bus bars, virtually eliminating corrosion due to intrusion of gas or moisture between the insulation and the bus bars.

Typical Two-High Configuration

 
© Copyright Miller Media, Inc. 2000