Introduction
VISIBLE ISOLATOR OPEN POSITION
VISIBLE ISOLATOR PULLS BACK INTO
OPEN POSITION
VISIBLE ISOLATOR CLOSED POSITION
1.
2.
Product Guide
VISI-SWITCH
®
dictated by the drive mechanism which rapidly opens the
vacuum interrupters to break the current and then, after
a short delay, opens the isolators. The viewing window
embedded in the isolator bushings can be seen from
the ground allowing maintenance staff to confirm that
the switch has been isolated prior to commencing work.
The product has been extensively type tested by
independent laboratories to ensure long life and reliability
under the harshest environmental conditions. The VISI-
SWITCH
®
can operate in extreme temperatures, over
a -40 to 55
o
C temperature range, 0 to 100 percent
humidity, and meets specified ratings up to a height of
1000 m (functional up to 3000 m with derating). The unit
is designed to cope with exposure to salt spray, dust,
smoke and corrosive gases, vapours and liquids. The
viewing window is scratch resistant and can withstand
impact such as hail according to IK08.
Utilities employ three-phase load break switches to
isolate sections of feeders for maintenance work. In
recent years, older air break switches, which could not
be operated while the feeder was under load have been
replaced by gas switches. While enclosed gas switches
address the reliability deficiencies of air break switches,
it comes at a cost of compromised safety because
maintenance staff can no longer visually check that
all three phases are isolated before starting work on
the feeder. SF6 has also been identified as the most
potent greenhouse gas and utilities will most likely incur
the cost of disposing the SF6 gas at the end of life of
the switch.
NOJA Power’s engineers have designed the
VISI-SWITCH
®
to overcome the drawbacks of gas
load break switches providing the linesmen with visible
break confirmation that the switchgear has isolated the
line before commencing work. Furthermore, the units
are far more environmentally friendly than existing
solutions because the solid dielectric eliminates the use
of a potent greenhouse gas. Like all other switchgear
products designed and manufactured by NOJA Power it
also features controlled arc fault venting.
The VISI-SWITCH
®
demonstrates NOJA Power’s
ongoing commitment to the environment, quality and
safety making the VISI-SWITCH
®
OLB15-16-800 the
ideal choice for today’s smart grids.
