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CAT NO: DIDACTICNLE-Export-420014
Tracking Index Apparatus For Electrical Lab Training.
Tracking Index Apparatus - For Electrical Lab Training
Breakdown of any insulating material generally occurs either through
its volume or over its surface, or in both ways. Surface failures may
arise from flash over, or from progressive degradation of the insulation
surfaces by small localized sparks. Such sparks are the result of
breaking up of a surface film of conducting contaminant on the
insulation by the heat of a leakage current passing through it. Rapid
breaks in the leakage current produce an over-voltage at the site of the
discontinuity and an electric spark is caused. Repeated sparks at any
one point may lead to setting up of a carbon track between points at
different potentials. This process is known as Tracking.
Insulating parts retaining live parts in position shall have adequate
resistance to tracking if they are exposed to excessive deposition of
moisture or dirt in normal use.
The test chamber is placed on the
side of a sheet metal control panel which houses various voltage and
current controlling elements, besides switches, indicators, drop
counter, etc. The control panel is fitted with an auto transformer
(variac) to vary the voltage across the electrode and a rheostat to
adjust the resistance in the circuit to limit the current to 1 ampere
with the electrodes short circuited, and a drop counting circuit with an
electronic digital counter to count the number of drops. It is also
fitted with a digital voltmeter, a digital ammeter, and various switches
and indicators. A thermal relay is provided to trip off the supply to
the electrodes and to activate an audio-visual alarm as soon as the
breakdown of the insulation occurs.
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