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Idiomas disponibles
Idiomas disponibles
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
PRODUCT FEATURES
utilizes an advanced, low-voltage, step-down measurement
®
Model 8500
®
CHAPTER 2
automatically checks for:
®
displays:
®
5
Capítulos
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