Product Features; Description - AEMC 8500 User Manual

Digital transformer ratiometer

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2.1

Description

The DTR

Model 8500 is a lightweight, rugged, portable digital transformer

ratiometer designed for onsite testing of power, potential and current trans-

formers. Operation of the Model 8500 is fully automatic. No user calibra-

tion, range selection, hand cranking or tedious balancing is required.

During each test cycle, the DTR

• H/X lead reversal

• Continuity of tested circuits/windings

• Short circuit conditions (high current)

Upon completion of a test cycle, the DTR

• Turns Ratio - the ratio of the primary to secondary voltage at the

transformer terminals due to test excitation

• Excitation Current - the RMS excitation current in the H winding

due to test excitation during negligible loading of the associated X

winding

• Polarity - indicates the polarity (phase) of X relative to H

Turns Ratio, Excitation Current and Polarity are useful parameters in diag-

nosing and predicting a variety of faults that occur in power, potential and

current transformers.

The Model 8500 will display the following messages:

• Incorrect Lead Connections

• H/X Reversal (accidental step-up misconnection)

• Short (excess excitation current)

• Open Circuits

• Circuit Continuity

• Low Battery

The DTR

technique in which the high voltage "H" winding is subjected to test

excitation. This results in greater operator safety and the ability to test

a much wider array of transformer types and sizes.

Digital Transformer Ratiometer DTR