FI module |
NI module
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Ratings for FI available through 25kV, with
12.5kA symmetric interrupting. Ratings for NI available through
35kV, with 12.5, 16 and 20kA symmetric interrupting.
The model FI and NI vacuum interrupters
consist of three vacuum bottles mechanically linked to a single
spring-assisted operating mechanism. Once initiated, the interrupting
time of the vacuum bottles is approximately 3 cycles (50 mseconds).
A position indicator (open-green, closed-red) driven by the
operating mechanism and is visible through a viewing window
for positive contact position. The mechanical linkage assembly
provides a "trip-free" operation permitting the
vacuum interrupter to interrupt independent of the operating
handle if closing into a faulted circuit.
The trip module monitors the current on
each phase and activates a trip solenoid to open the three
vacuum bottles if an overcurrent on any phase is sensed. The
trip modulel is self-powered by current transformers mounted
inside the sealed switch tank. No external power source is
required. Load current is required for the electronics to
be activated unless the optional emote power feature is specified.
The trip selector is used to select the time-current response
curve for the tap circuits. The time-current response curves
are chosen with the phase selector switches on the face plate
of the trip module. Selection of time-current characteristics
may be made under load or no-load conditions with continuous
current ranges in twelve selectable levels.
The manual trip and reset of the vacuum
interrupter is accomplished through a single handle operating
all three phases simultaneously. Motor actuators can be provided.
Optional pushbutton on certain electronics also permits manual
tripping.
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