6
Digital Transformer Ratiometer DTR
®
Model 8510
CHAPTER 2
PRODUCT FEATURES
2.1 Description
The Digital Transformer Ratiometer DTR
®
Model 8510 is a lightweight,
rugged, portable instrument designed for onsite testing of power, potential
and current transformers.
Operation of the DTR
®
8510 is fully automatic. No user calibration, range
selection, hand cranking or tedious balancing is required.
During each test cycle, the DTR
®
8510 automatically checks for:
• H/X lead reversal
• Continuity of tested circuits/windings (if configured)
• Short circuit conditions (high current)
Upon completion of a test cycle, the DTR
®
8510 displays:
•
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
•
Deviation:
Indicates the deviation from nameplate ratio in %
Turns Ratio, Excitation Current, Polarity and Deviation are useful param
-
eters in diagnosing and predicting a variety of faults that occur in power,
potential and current transformers.
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