Megger TTR310 Three Phase Transformer Turns Ratio Tester
$11,059.00
Availability:
In stock
SKU
MG20
Condition: Refurbished / Calibrated
Warranty: 1 Year Warranty
Shipping: USA & Worldwide
- Megger TTR310 Three Phase Transformer Turns Ratio Tester (BC# -L/T*)
- Ethernet Cable
- RS232 PC Interface Cable
- Power Cord
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Megger TTR310 Transformer Turns Ratio
Test Set
The TTR300 Series of three-phase transformer turns ratio test sets are designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. A rugged and robust design makes these instruments well suited for use in a variety of harsh environments. Our leads are specially designed to provide the necessary flexibility needed in cold weather.
The TTR300 Series are ideal for use by power transformer manufacturers. Their unique testing procedures and storage capability allows an operator to set up and test difficult three-phase transformers (with multiple tap changers and bushing CTs) in a fraction of the time than it used to take with other TTRs. This test also includes a pass/fail limit of individual ratios.
The TTR300 Series also measure the phase deviation of the transformer primary versus secondary. This quickly indicates problems in the transformer such as partial shorted turns and core faults. This measurement is also useful in verifying phase errors in all types of PTs and CTs.
Each unit comes equipped with a remote-control switch for single person testing. This allows the operator to test transformers with LTCs very quickly.
The Series consists of four instruments:
TTR310
This unit features an easy-to-read, high-contrast LCD which can be seen in bright sunlight and provides the user interface for instrument set-up and test operation. The unit comes complete with the software application, PowerDB LITE.
The TTR310 has the ability to store test results, upload results to a PC (via RS232 serial port), and/or print them in the field via optional thermal paper printer, without the use of an external computer.
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:
For full Megger TTR310 Transformer Turns Ratio Tester product specifications, please click here: Megger TTR310
The TTR300 Series of three-phase transformer turns ratio test sets are designed to measure the turns ratio of power, instrument, and distribution transformers in a substation or manufacturing environment. A rugged and robust design makes these instruments well suited for use in a variety of harsh environments. Our leads are specially designed to provide the necessary flexibility needed in cold weather.
The TTR300 Series are ideal for use by power transformer manufacturers. Their unique testing procedures and storage capability allows an operator to set up and test difficult three-phase transformers (with multiple tap changers and bushing CTs) in a fraction of the time than it used to take with other TTRs. This test also includes a pass/fail limit of individual ratios.
The TTR300 Series also measure the phase deviation of the transformer primary versus secondary. This quickly indicates problems in the transformer such as partial shorted turns and core faults. This measurement is also useful in verifying phase errors in all types of PTs and CTs.
Each unit comes equipped with a remote-control switch for single person testing. This allows the operator to test transformers with LTCs very quickly.
The Series consists of four instruments:
TTR310
This unit features an easy-to-read, high-contrast LCD which can be seen in bright sunlight and provides the user interface for instrument set-up and test operation. The unit comes complete with the software application, PowerDB LITE.
The TTR310 has the ability to store test results, upload results to a PC (via RS232 serial port), and/or print them in the field via optional thermal paper printer, without the use of an external computer.
- Fully automatic operation (either stand-alone or remote-control)
- Field upgradeable to a TTR330 or TTR320 without compromise to calibration
- Built-in RS-232 port and optional thermal spool-paper printer allows for printing of test results, while in the field, and without the use of an external computer
- Built-in capability for storing test results into internal memory in an open data format for direct input into Excel® or XML format via PowerDB LITE
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) |
For full Megger TTR310 Transformer Turns Ratio Tester product specifications, please click here: Megger TTR310