The Artificial Neutral Model AN-1 generates
a momentary grounded artificial neutral to allow the measurement
of fault currents on ungrounded three-phase systems.
The Artificial Neutral is grounded intermittently
through a relay driven by an internal electronic timer. This
periodic grounding technique performs three functions – limits
the possibility of insulation faults within the instrument,
allows for better discrimination of actual fault current and
limits instrument overheating.
Relay closure time is switch selectable, Fast
(0.5 seconds) or Slow (2.3 seconds), so that the ground fault
clamp can be used on a meter with either an analog or digital
display. An internal buzzer, also driven by the relay, is
activated each time the neutral connection is grounded. Three
LEDs, one for each phase, show the presence of each of the
three phases prior to measurement. A fourth green LED indicates
that the instrument is operatings.
Features
Designed for ungrounded networks — provides intermittent
path to ground for leakage current measurements
Works from 30 to 600VAC
Red LED phase fault indicator
Switch selectable ground fault cycling of 500mS or 2.3
seconds
Buzzer alerts each momentary fault
Battery operated
Double insulated, fire retardant case
Four color-coded 5 ft 1000V rated leads supplied with
alligator clips
Works with Model 2620 and other leakage current probes
