Operating the MTO210
AVTMTO210 Rev 7 Sept 2013
17
Press
to change the transition sensitivity. 0 is off and the higher the
number, the more sensitive the circuit will be for current transitions.
Press
to turn ON or OFF the OHM 2 display during testing.
7.
locally stored temperature that the unit will store with the resulting data
for all subsequent tests. Press
and
to change the transformer
winding temperature at the time of test.
8.
Press
and the unit will apply power to the transformer and attempt
too charge the transformer to the maximum current set level. Once the
current has stabilized, the unit will calibrate all inputs and take resistance
readings continuously.
9.
Press
during testing and the unit will save and/or print the
displayed data (based on the setting of the Data Output Mode Switch).
This button makes it possible to take multiple readings such as an on
load tap changer test. The unit will display the test number in the current
display and Saved in Ohm 2 display for 2 seconds to acknowledge the
data saved.
10.
Press
and the unit will turn off power to the transformer, store
and/or print the data (based on the setting of the Data Output Mode
Switch and display the data on the LCD display for review.
The data will stay on the LCD until another function or
is selected.
DISCHARGE FUNCTION
This button, when pushed will stop testing and discharge the
transformer. The
Discharge Indicator
to the left will illuminate during
the discharge cycle. No data is stored in the memory and/or output
to printer.
The discharge of a transformer after testing is critical to prevent excessive
voltage buildup across the transformer bushings upon removal of current. When
the current source is disconnected, the energy in a transformer will continue to
flow. If there is high impedance (air), the voltage across the inductor will increase
until there is a current path found for the energy. This can be either an internal
or external current path. It is possible to attach a shorting cable across the
transformer bushings before the current source is turned off. Since the short has
very little resistance, the circulating current thru the transformer and the short
may continue for a very long period of time. The MTO discharge circuitry is
Summary of Contents for MTO210
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