AEMC DTR 8510 User Manual page 36

1. Connect the Primary (H) cable to the appropriate connectors on
the DTR Model 8510 and the transformer under test. Connect the
®
Secondary (X) cable as a loop through the current transformer hole as
shown in the figure.
2. Press the TEST button. During the Ratio test, the instrument will
check for H/X reverse polarity, short (excessive current) etc. before
conducting Ratio test.
NOTE:
• If the H/X is reversed, the instrument will display the error
message (see Fig. 5-5) as in VT/PT test and terminate the test.
• If there were a polarity reversal, the Ratio would be blinking with
a negative sign. This means either the connections are reversed
on a given side or the transformer is wound backwards relative
to the marking.
• The test can be cancelled at any time by pressing the TEST
button during the operation.
• The CT test ramps up the voltage in steps. At the end of the test,
it ramps down the voltage.
• There are certain low mass, low ratio CT's for which the DTR
8510 may not be able to provide correct ratio. The error message
will be "High Excitation Current".
34
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BLACK
Figure 5-7
Digital Transformer Ratiometer DTR
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www.
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BLACK
H
RED
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.com
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Model 8510
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1.877.766.5412