Reference Standards - ABB OHB Installation, Service And Maintenance

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Outdoor SF6 Circuit Breaker - Type
OHB: Instruction for Storage,
Installation, Service and
Maintenance
Original Title: ABB Breaker
Uploaded by Sampath Kumar
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5. Description:
The OHB medium voltage circuit-breakers
for outdoor installation use sulphur
hexafluoride gas as insulating and arc
quenching medium. The mechanical
operating mechanism used is ESH type
with stored energy and free release which
allows opening and closing operations
from local and remote positions. The
operating mechanism, the activating
kinematics of the moving contact , all the
control and operating circuits and the
anti-condensation heater are located
inside the tight metal cabinet which also
acts as the support for the poles and Duct.
The above-mentioned structure is
supported by a frame made of telescopic
metal sections, which provides the
flexibility to adjust the height of the
circuit breaker from 3090 to 3990 mm.
The Cabinet has IP 54 degree of
protection (if provided with filters
over the ventilation holes on the
bottom of the box - optional) and is fitted
with a tight door with inspection window.
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The door has a pad-locking arr
Legend [Refer Fig.3]
1. Upper Terminals
2. Porcelain Insulators
3. Lower Terminals
4. Lifting Hooks
5. Supporting Structure
6. Cabinet
7. Inspection window
8. Cross-Angles

5.1. Reference Standards

OHB circuit-breakers comply w
IEC 62271-100, as well as the
of the standards of other major
countries.
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ABB Protection Transform
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