Megger TTR330 Three-Phase Transformer Turn Ratio Test Set

- Stand-alone or remote-control operation
- Displays % error vs. name plate with pass/fail limits
- Field upgradeable without compromise to calibration
- Built-in capability for storing and downloading test results in an XML format, via RS-232, Ethernet or USB ports (depending on model)
- Works in the presence of high interference/high voltage
- Highest ratio measurement (45,000:1);highest accuracy (0.1%)
- Displays % error vs. name plate with pass/fail limits​

The TTR330 offers a new user interface which allows the operator to interact with the PowerDB ONBOARD software system via full QWERTY and navigation keypads as displayed on an 8.4" VGA bright-color screen. One of the primary benefits of this interface is that it displays the actual test form on the screen. An advanced feature of the TTR330 allows the user to customize these test forms via optional full-version PowerDB.
 

Other primary features of the TTR330 include three communications ports (two USB, one Ethernet). The USB "host" ports can be used for connecting directly to an optional printer (to print full size 8.5" x 11" completed test forms) and for data storage to a USB memory device (for later printing, analysis, archiving, and/or trending). The Ethernet port allows the TTR330 to interface (on a bidirectional basis) directly to a PC.
 

Features:

• Fully automatic operation (stand-alone or remote-control) with user interface via on-screen customizable test forms
• Integrated PowerDB ONBOARD allows for data analysis and trending while in the field without the use of an external computer
• Built-in USB port and optional USB printer allows for 8.5"x 11" test forms printing without the use of a laptop
• Built-in capability for storing test results, in an open XML format, to either internal memory or to an external USB storage device
• Full 8.4" VGA color display

Specifications:​

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Input Power
120/230 V ac ±10%, single phase, 50/60 ±2 Hz 100 VA

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Battery Operation (Optional)
Inverter 12 V dc to 120 V/230 V ac for operation from vehicle battery
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Excitation Voltage
8, 40, or 80 V rms, automatically or manually selected
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Excitation Current Range and Accuracy
​0 to 500 mA, 3 digit resolution, ±(2% of reading + 1 digit)
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Phase Deviation Range and Accuracy
±90 degrees, 1 decimal point for the minutes display, 2 decimal
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points for the degree display, or for the centi-radian display
Accuracy: ±3 minutes
​

Turns Ratio Range and Accuracy
8 V ac: ±0.1% (0.8 to 2000)
±0.25% (2001 to 4000)
±0.35% (4001 to 8000)
40 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.3% (4001 to 10,000)
±0.35% (10,001 to 25,000)
80 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.25% (4001 to 10,000)
±0.30% (10,001 to 45,000)
​

​Resolution: 5 digit for all ratios
Printer Interface
TTR300: Not applicable
TTR310: RS-232 port
TTR320: RS-232 port
TTR330: USB
Computer Interface
TTR300 and TTR310: RS-232 port
TTR320 and TTR330: Ethernet
User Interface
TTR300: Not applicable
TTR310: 5.7 in., B&W display, text on-screen view,
numeric keypad
TTR320: 5.7 in., full-color VGA, graphical icon on-screen view,
full QWERTY keypad and navigational pushbuttons
TTR330: 8.4 in., full-color VGA, test forms on-screen view,
full QWERTY keypad and navigational pushbuttons
Internal Data Storage
TTR310: up to 200 data sets
TTR320 and TTR330: up to 100,000 data sets
Communication/Control Software
PowerDB LITE and PowerDB (full version, optional)
TTR330: PowerDB ONBOARD
Transformer Winding Phase Relationship
ANSI C57.12.70-1978
CEI/IEC 76-1:1993 and Publication 616:1978
AS-2374, Part 4-1982 (Australian Standard)
Safety/EMC/Vibration
Meets the requirements of IEC-1010-1, CE and ASTM D999.75
Temperature Range
Operating: 23° F to 122° F (-5° C to 50° C)
Storage: -58° F to 140° F (-50° C to 60° C)
Relative Humidity
0 to 90% noncondensing
Measuring Time
8 to 20 seconds depending on mode of operation and
type of transformer
Measurement Method
ANSI/IEEE C57.12.90
Dimensions
8.5 H x 21.5 W x 13 D in.
(216 H x 546.1 W x 330.2 D mm)
Weight
Instrument only, not including leads
TTR300: 20 lbs (9.1 kg)
TTR310: 23 lbs (10.4 kg)
TTR320: 25 lbs (11.3 kg)
TTR330: 25 lbs (11.3 kg)​