Name: Megger TTR310 Three Phase Transformer Turn Ratio
Brand: Megger
SKU: 1483
Availability: InStock

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Megger TTR310 Three Phase Transformer Turn Ratio

Original price was: $4,860.00.Current price is: $2,430.00.

Store and download test results in XML format, via RS-232, Ethernet or USB ports (depending on model)
Works in the presence of high interference/ high voltage
Capable of measuring phase-shifting transformers
Highest ratio measurement (45,000:1)
Displays % error vs. name plate with pass/fail limits
Capability for automatic vector detection when testing via PowerDB

Categories: Surveying Equipment, Tester Tag: Megger Brand: Megger

Description

Megger TTR310 Three Phase Transformer Turn Ratio

Applications
The TTR300 Series applies voltage to the high-voltage winding of a transformer and accurately measures the resulting voltage from the low voltage winding. In addition to turns ratio, the units measure excitation current, phase angle deviation between the high- and low-voltage windings and percent ratio error.

Transformer Turns Ratio
Transformer turns ratio is the ratio of the number of turns in the high-voltage winding to that in the lowvoltage winding. Complexity in the measured ratio versus nameplate ratio occurs with most three-phase power transformers because multipliers such as √3 are required to match the measured ratio to the nameplate ratio. The TTR300 Series automatically applies the multiplier in a form which allows the operator a direct comparison to the nameplate (or expected) ratio. The built-in calculator displays the % error versus nameplate for each tap and each winding, without the need for a computer.

Exciting Current
The TTR provides accurate measurement of exciting current (to 0.1 mA) which can help provide information about the condition of a transformer’s core. Unwanted circulating currents or unintentional core grounds can increase the exciting current and indicate a problem.

Phase Angle Deviation and its Application
The phase angle deviation, displayed in either degrees (minutes) or radians, is the phase relationship between the voltage signal applied to the high-voltage winding and the voltage signal extracted from the low-voltage winding. The phase deviation, together with ratio error, can be used as a low-cost method of verifying accuracy class of all types of PTs and CTs at “zero burden.”

The phase deviation between the high and low side of a transformer is generally very small. If there is deterioration or damage in the transformer core, however, the phase deviation can change significantly. The three-phase TTR can measure this phase relationship with the resolution of 0.1 minutes (equal to 1/600 of a degree), which is necessary to detect problems.

Specifications:

Input Power	120/230 V ac ±10%, single phase, 50/60 ±2 Hz 100 VA
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 and accuracy	0 to 500 mA, 3 digit resolution, ±(2% of reading + 1 digit)
Phase deviation range and accuracy	±90 degrees, 1 decimal point for the minutes display, 2 decimal 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	RS-232 port
Computer interface	RS-232 port
User interface	5.7 in., B&W display, text on-screen view, numeric keypad
Internal data storage	up to 200 data sets
Communication / Control software	PowerDB LITE and PowerDB (full version, optional)
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	23 lbs (10.4 kg)