Introduction - ABB OneFit Instruction Manual

O N E F I T - C A B L E T E S T A N D T E M P O R A R Y E A R T H I N G T R U C K I N S T R U C T I O N M A N U A L
4
—

Introduction

OneFit
OneFit is the latest ABB hard-bus retrofill design
concept featuring an integrally safe plug-in
technology for easy connection of new standard
apparatus to a wide range of existing panels.
Retrofill is a modernization process involving
replacement of the circuit-breaker and the main
functional components of the original switchgear.
OneFit is designed to replace apparatus while
maintaining the existing switchgear in a
serviceable condition.
OneFit comprises a frame housing the circuit-
breaker, connected to the existing switchgear
bushings by an additional power circuit that acts
as an internal interface with the new breaker.
The adaptation system (the OneFit kit) allows you
to fit completely standard ABB withdrawable
apparatus into the old panel.
OneFit units can be equipped with the following
apparatus (in the procedure named CB):
• VD4, Vmax, VM1 series vacuum circuit-breakers;
• HD4 series SF6 gas circuit-breakers;
• V-Contact VSC series vacuum contactors;
• Operational trucks.
The instructions in this manual refer to the OneFit
cable test and temporary earthing truck. For
correct use of the apparatus, please refer to the
relevant "Installation and maintenance
instructions".
OneFit solution is designed for a large number of
installation configurations.
However, it allows further technical and
constructional modifications to be made, so as to
adapt to special installation requirements.
Consequently, the information given below may
sometimes not contain certain instructions
concerning special configurations requested by
the customer.
Apart from the manual, it is therefore always
necessary to consult the latest technical
documentation (circuit and wiring diagrams,
foundation plans, any protection coordination
studies, etc.), especially regarding any
modifications requested in relation to the
standard configurations.
For maintenance, only use original spare parts.
Cable test truck
OneFit provides a service truck on demand
required to enable the service and maintenance
operations to be conducted.
The cable test truck allows the insulation tests to
be carried out on the power cables without
accessing the feeder unit or disconnecting the
cables from the switchgear.