3 Introduction
3.1 History
Raytech
first developed the Transformer
T
urns
R
atio
Spy
(
TR-Spy
) for high degree of
accuracy for the research and development of transformers. This technology was then
packaged into a portable test system for use by transformer manufacturers, rebuild shops,
and electrical maintenance crews. This first system had become the most widely respected
precision instrument for the ease of use, design, and operation. It was developed with the
assistance of transformer manufacturer’s and utility test crews.
The
TR-Spy MARK II
took this initial development and added many new features to the
system including a large memory base, external control for tap changer testing, and
automatic voltage level detection test. The TR-Spy MARK II was a completely new approach
in technology and has become the standard for ratio testing.
Now
the TR-MARK III
offers new features and increased accuracy to make it a perfect
system. A color LCD with back lighting and touch screen increases handling and user
comfort. Two USB interfaces make it easy to store measurements on external storage
devices and transfer easily to a personal computer. Test Reports; just print them on the
internal printer or from your computer.
3.2 General
Ease of use:
This system is designed to be easily used and understood. Once the buttons
and few menus are learned the system is very simple to understand and operate.
This intelligent system analyzes the configuration of a transformer and performs all required
measurements automatically for Voltage Ratio, Turns Ratio, Current, and Phase
Displacement. The system can operate a full 3 phase testing sequence with a single push
button operation. Connect the leads, Select the transformer configuration then press GO to
test.
Impressive Accuracy:
The TR-MARK III is a high precision, fully automatic, microprocessor
based, Single and Three Phase Transformer Turns Ratio Test system. This system is
designed for highly accurate readings on-site with laboratory precision. It is the most
accurate system available.
Unique Measuring Technique:
This newly designed technique of measurement
incorporates a high precision dual-vector voltage meter for ratio readings and a rectification
resolution circuit for phase displacement (vector group). The phase displacement (vector
group) can be automatically detected and displayed without operator intervention.
Operation:
The TR-MARK III first applies a small voltage on the HIGH winding side of the
transformer and measures back through the LOW side of the transformer. Analysis is made
and the system determines whether a test can be conducted. Then the system applies the
test voltage on the HIGH winding side of the transformer and measures the voltage back
through the LOW side of the transformer. This technique has been determined to be the
safest possible method of ratio testing. The results are reported on the easy to read touch
screen display.
Compact Design:
The TR-MARK III is a lightweight system designed with its own rugged
waterproof field case.
90100-2.20 Instruction Manual TR-MARK III 250V
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