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Set the ammeter range switch to one of the main output ranges (10%, 50% or 100%). Connect
the output cables to the desired output on the loading unit and to the test object.
Connect the supply lead to the mains and switch the main supply switch on. The display will
come on, showing the unit type and loading unit type whilst starting up.
2.3.2.2 Testing
It is advisable to make a preliminary test on the test object, starting at zero voltage, in order to
test the load impedance, before performing the test with output control set at higher values.
Therefore, ensure the output control knob is fully anti-clockwise before switching on.
Ensure the timer mode switch is in the off position and depress the ON push-button. Increase
the current by rotating the output control knob in a clockwise direction until the desired current
is indicated on the ammeter. Press the output OFF push-button.
Connect the test object contacts to the contact terminals on the test set, select the internal
start timer mode. If the test object has no auxiliary contacts (e.g. thermal breakers), it will be
necessary to use the current operated timer mode.
When the output ON push-button is pressed, the following will occur:
a.
The timer will start and current will flow through the test object.
b.
When the test object's contacts change state, the timer will stop, and the test current
will be automatically switched off.
2.3.2.3 After Testing
On completion of the test, return the output control to zero and switch off the supply. Before
disconnecting the test-object, ensure the mains supply switch is in the OFF position.
2.4 Storage of results
The CU-Ps can store all displayed values to a CSV spreadsheet file whenever the timer stops,
or the output is switched off. This is useful for recording all results, plotting relay curves and
plotting transformer magnetisation curves.
Files are stored on the USB key in the folder \TRTEST. A folder is then created in this using
the day’s date, and results files are named with the time of the test.
A comment can be entered to be stored with the results using a USB keyboard.
The following values are stored:
Time
Date
Main output current
Timer result
Auxiliary current/voltage input value
Auxiliary current/voltage input phase angle
Auxiliary current/voltage input frequency
Comment