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
FRA100
Sweep Frequency Response Analyzer
Portable SFRA analyzer for winding-deformation testing of power transformers (6 kV and above) — 10 Hz–10 MHz sweep, up to 50,000 points, ≤0.001 % frequency inaccuracy, and 9-curve comparison software.
Frequency range
10 Hz – 10 MHz
Frequency inaccuracy
≤0.001 %
Sweep points
600 default · max 50,000
Dynamic range
−120 … +20 dB
Sampling rate / channels
100 MS/s · 2 inputs / 1 output
Weight
2.3
Overview
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| Test method | SFRA (Sweep Frequency Response Analysis) | |
| Frequency range | 10 Hz – 10 MHz | |
| Frequency inaccuracy | ≤0.001 % | |
| Number of points | Default 600, user selectable; max. 50,000 user-defined | |
| Measurement time | 1 – 2 minutes per winding | |
| Points spacing | Logarithmic or linear | |
| Sweep settings | Individual settings per user-defined frequency band; linear or logarithmic scale | |
| Dynamic range | −120 dB … +20 dB | |
| Inaccuracy | ±0.1 dB from +10 dB down to −50 dB · ±0.5 dB down to −80 dB · ±1 dB down to −100 dB | |
| PC communication | USB | |
| Software | Windows XP / 7 / 8 / 10 | |
| Channel | 1 | |
| Compliance voltage | 0.50 – 25 Vp-p, adjusted automatically in test | |
| Measurement voltage at 50 Ω | 0.25 – 12.5 Vp-p | |
| Output impedance | 50 | Ω |
| Frequency range | 10 Hz – 10 MHz | |
| Sweep direction | Low to high | |
| Channels | 2 | |
| Sampling | Simultaneous | |
| Frequency range | 10 Hz – 10 MHz | |
| Input impedance | 1 | MΩ |
| Sampling rate | 100 | MS/s |
| Operating system | Windows XP / 7 / 8 / 10 | |
| Processor | Pentium 500 MHz or higher | |
| Memory | 256 MB RAM or more | |
| Hard drive | Minimum 30 MB free | |
| Interface | USB | |
| AC power (adapter) | 100 – 240 V AC, 50/60 Hz | |
| DC power (instrument) | 12 V DC | |
| Dimensions | 238 × 184 × 40 | mm |
| Weight | 2.3 | kg |
| Application field | Medium- and high-voltage substations and industrial environments | |
| Operating temperature | −20 … +50 | °C |
| Storage temperature | −20 … +70 | °C |
| Safety | Designed in accordance with IEC 61010-1, 2006/95/EC | |
| EMC | 2004/108/EC | |
Key Features
SFRA winding-deformation testing
Measures the amplitude-frequency response of each winding of transformers rated 6 kV and above without removing the cover or dismantling the active part.
Wide sweep with high frequency accuracy
10 Hz – 10 MHz frequency range with ≤0.001 % frequency inaccuracy and digital frequency synthesis for stability.
Up to 50,000 sweep points
600 points by default, user-definable to a maximum of 50,000, with logarithmic or linear spacing per frequency band.
Fast single-winding measurement
Approximately 1–2 minutes per winding; one-button operation completes measurements after parameters are set.
9-curve comparison & auto diagnosis
Loads up to nine response curves at once and automatically calculates curve parameters to diagnose winding deformation and provide a reference conclusion.
5000 V input isolation
Galvanic isolation protects the connected laptop during measurement.
Intelligent analysis software
Windows software fulfills IEC 60076-18:2012 analysis requirements and is highly automated for field use.
Compact, lightweight design
238 × 184 × 40 mm and 2.3 kg — easily carried to any transformer.
Applications
Post-transport verification
Confirm that transformer windings were not deformed during shipping.
Post-fault assessment
Check the core and winding assembly after through-faults or high through-currents.
Winding & core condition assessment
Detect radial or axial deformation, loosened clamping, core movement and displaced turns.
Factory reference fingerprinting
Record baseline frequency-response fingerprints for later comparison.
Commissioning & routine maintenance
Substation commissioning checks and scheduled diagnostic testing of power transformers.
Frequently Asked Questions
What does an SFRA test detect on a power transformer?
SFRA detects mechanical and electrical changes in the core and winding assembly — radial or axial winding deformation, loosened clamping, core movement and displaced or shorted turns. It works by comparing the winding's frequency-response fingerprint against its own baseline, a sister unit or a reference measurement.
Do I need to remove the transformer cover to test it?
No. The FRA100 tests transformers rated 6 kV and above without removing the cover or dismantling the active part.
How long does a measurement take?
About 1–2 minutes per winding. With the software's one-button operation, all measurements for a three-phase transformer can be completed quickly after the parameters are set.
Which standards does the FRA100 meet?
IEC 60076-18:2012 and CIGRE Brochure 342 (2008). The manufacturer also references Chinese standard DL/T 911 for FRA on winding deformation — note that both the 2004 and 2016 editions appear in the source material, so confirm the edition applicable to your market.
Downloads
Related Products
TTR-400
The TTR-400 is a portable transformer turns ratio meter that measures turns ratio, voltage ratio and phase displacement…
- Ratio range 0.9 – 10000
- Accuracy (by ratio range) ±0.1 % / ±0.2 % / ±0.5 %
- Test voltage 0 – 160
TDC-3100
The TDC-3100 is a fully automatic 12 kV insulation power-factor / dissipation-factor (tan δ) and capacitance test set…
- Internal HV output 0.5 – 12 kV · 2000 VA
- Dissipation factor (tan δ) ±(rdg ×1 % + 0.040 %)
- Capacitance (Cx) 15 pF – 60 nF @ 12 kV