Atec Megger-550503 - Manual (Page 3)

Three-Phase TTR ®
Transformer Turns Ratio Test Set
SPECIFICATIONS
Input Power
Cat. No. 550503:
120 V ac ±10%, single phase, 50 ±2 Hz or 60 ±2 Hz, 100 VA
Cat. No. 550503-47:
230 V ac ±10%, single phase, 50 ±2 Hz or 60 ±2 Hz, 100 VA
Frequency: 50/60 Hz (±2 Hz)
Battery operation
Optional inverter 12 V dc to 120 V/230 V ac for operation from
vehicle battery.
Excitation Voltage
8, 40, or 80 V rms, automatically or manually selected
Excitation Current Range
0 to 500 mA, 3 digit resolution
Turns Ratio Range
8 V ac:
0.8 to 4000, 5 digit resolution
40 V ac: 0.8 to 15,000, 5 digit resolution
80 V ac: 0.8 to 20,000, 5 digit resolution
Phase Deviation Range
±90 degrees, 1 decimal point for the minutes display, 2 decimal
points for the degree display, or for the centi-radian display
Current (rms) accuracy
±(2% of reading + 1 digit) Phase Deviation Accuracy: ±3 minutes
PC/Printer Interface
RS232C port, 9-pin 9600 baud
Display
LCD module, 256 x 128 dots
(this translates to 42 characters by 16 lines)
Turns Ratio Accuracy
8 V ac:
±0.1% (0.8 to 2000)
±0.25% (2001 to 4000)
±0.50% (4001 to 8000)
40 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.3% (4001 to 10,000)
±0.50% (10,001 to 15,000)
80 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.25% (4001 to 10,000)
±0.50% (10,001 to 20,000)
Test Result Storage
Internal, nonvolatile memory for storing up to 200 sets of three-
phase measured and calculated ratio, exciting current, phase, ratio
error, plus serial number and transformer type.
Computer Software
Included software for data storage, report printout, and download
of data to a PC. Optional software for remote control of the TTR
and database construction.
Test Leads
Supplied with one complete set of three-phase leads. A set of
single-phase leads is also available as an optional accessory.
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
Operating: 0 to 90% noncondensing
Storage: 0 to 95% noncondensing
Protective Devices
Type T fuses per IEC 127 designation, HV & LV shorting relays,
heavy-duty varistors, transient voltage suppressors, and gas surge
voltage protectors.
Measuring Time
8 to 20 seconds depending on mode of operation and type of
transformer
Measurement Method
ANSI/IEEE C57.12.90
Dimensions
10.5 H x 17.5 W x 6.9 D in.
(266.7 H x 444.5 W x 175.3 D mm)
Weight
Approx. 16.5 lbs (7.5 kg), instrument only, not including leads
Instrument Case
Light gray color ABS case with lid and carrying strap
Transit Case
Rugged case for storing/shipping the instrument, all leads and
other accessories
OPTIONAL ACCESSORIES
Power Inverter
It may be necessary to have a portable power source in
the field. Motor-generators are notorious for poor sine-
wave output, as well as frequency instability. Since a
vehicle is always available nearby, a power inverter using
the vehicle’s battery can provide the energy needed to
power up the TTR. The optional inverter can be
connected to the car’s cigarette lighter. The inverter’s
output provides a true sine wave rated to deliver 125 watts
of ac power. It is also protected with features that will
automatically shut off in case of under-voltage,
Sample TTR Test Results Report Printout.