TWO-1100S
The TWO-1100S is a transformer winding ohmmeter that measures DC resistance of power and distribution transformer windings, rotating-machine…
- Max. test current 100
- Resistance range 30 µΩ – 4 Ω
- Accuracy ±0.2 % rdg ± 2 µΩ
TTR-400
Transformer Turns Ratio Meter
Portable turns-ratio and voltage-ratio meter with 7-inch touch screen for single-phase and three-phase distribution and power transformers — 0.9–10000 ratio range, 0–160 V test voltage and tiered ±0.1 % / ±0.2 % / ±0.5 % accuracy.
Ratio range
0.9 – 10000
Accuracy (by ratio range)
±0.1 % / ±0.2 % / ±0.5 %
Test voltage
0 – 160
Phase accuracy
±0.1
Data storage
Up to 1000 data sets
Weight
5.9
Overview
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| Measuring range | 0.9 – 10000 | |
| Accuracy @ 0.9 – 500 | ±0.1 | % |
| Accuracy @ 501 – 2000 | ±0.2 | % |
| Accuracy @ 2001 – 10000 | ±0.5 | % |
| Measuring range | ±180 | ° |
| Accuracy | ±0.1 | ° |
| Resolution | 0.01 | ° |
| Test standard | IEC 60076 · IEEE C57.12.90 | |
| Test voltage | 0 – 160 | V |
| Excitation | Three-phase precision inverter power supply | |
| Winding connection | Automatic identification · vector-group test | |
| Display | 7-inch touch screen | |
| Internal data storage | Up to 1000 data sets | |
| Data download | USB interface | |
| Printing | Built-in printer | |
| Power supply | Customized AC 230 V / 120 V ±10 %, 50/60 Hz | |
| Operating temperature | −10 … +50 | °C |
| Storage temperature | −20 … +60 | °C |
| Dimensions | 360 × 290 × 170 | mm |
| Weight | 5.9 | kg |
| Safety | Designed in accordance with IEC 61010-1 | |
| EMC | Light industrial IEC 61326 | |
Key Features
Wide ratio range with tiered accuracy
Measures turns ratio and voltage ratio from 0.9 to 10000 with ±0.1 % accuracy at 0.9–500, ±0.2 % at 501–2000 and ±0.5 % at 2001–10000.
Variable test voltage 0–160 V
Excitation level can be adjusted to suit the transformer under test for stable, repeatable results.
Automatic connection & vector-group test
Automatically identifies the winding connection and tests the vector group of three-phase transformers — no manual connection setup.
Three-phase precision inverter power supply
Clean, precise excitation for more accurate ratio measurement.
7-inch touch-screen operation
A simple user interface provides quick test setup and immediate results.
On-board storage, USB download & built-in printer
Up to 1000 data sets stored on board; results can be printed directly or transferred via USB.
Integrated protection
High/low-voltage reverse-connection protection and transformer inter-turn short-circuit protection for safe field use.
Portable rugged enclosure
Compact case at 5.9 kg with a 360 × 290 × 170 mm footprint for easy transport.
Applications
Factory acceptance & commissioning
Ratio verification of single- and three-phase distribution and power transformers per IEC 60076 / IEEE C57.12.90.
Routine maintenance
Detection of wrong taps, shorted turns, open windings and connection errors during scheduled testing.
OLTC ratio verification
Voltage-ratio checks across on-load tap-changer positions.
Vector-group & connection checks
Winding-connection identification and vector-group testing of three-phase transformers.
Post-repair & post-transport testing
Verification after overhaul, repair or relocation.
Frequently Asked Questions
What does a transformer turns-ratio (TTR) test tell you?
It measures the ratio of the number of turns (and therefore the voltage ratio) between the high-voltage and low-voltage windings and compares it with the nameplate ratio at each tap position. A deviation indicates a wrong tap connection, shorted or open turns, incorrect winding connections or an OLTC fault.
Which test standards does the TTR-400 follow?
The TTR-400 follows IEC 60076 and IEEE C57.12.90 for power-transformer ratio testing.
Can the TTR-400 test three-phase transformers?
Yes. It tests both single-phase and three-phase distribution and power transformers, with automatic winding-connection identification and vector-group testing.
How are test results managed?
Up to 1000 data sets are stored on board. Results can be printed directly with the built-in printer or downloaded to a PC via the USB interface.
Downloads
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