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
TDC-3100
Tan Delta and Capacitance Tester
Fully automatic 12 kV insulation power-factor / dissipation-factor (tan δ) and capacitance test set with UST / GST / GSTg modes, CVT ratio testing and interference suppression — for transformers, bushings, breakers, cables, rotating machines and CVTs.
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
CVT ratio range
10 – 10000
Test modes
UST / GST / GSTg
Weight
22.8
Overview
Technical Specifications
| Specification | Value | Unit |
|---|---|---|
| Test standard | IEC 60247 | |
| Output range | 0.5 – 12 | kV |
| Output accuracy | ±(reading × 1 %) | |
| Resolution | 100 | V |
| Maximum output current | 200 | mA |
| Capacity | 2000 | VA |
| Output | AC 0 – 50 V / 15 A | |
| Measuring range | No limit | |
| Accuracy | ±(reading × 1 % + 0.040 %) | |
| Resolution | 0.001 | % |
| Measuring range | 15 pF – 60 nF (at 12 kV) | |
| Accuracy | ±(reading × 1 % + 1.00 pF) | |
| Resolution | 0.001 pF (4 valid digits) | |
| Measuring range | 10 – 10000 | |
| Accuracy | 1 % | |
| Suitability | CVT with accuracy class 1.0 or 3.0 | |
| Test modes | UST · GST · GSTg (selectable) | |
| Single frequency | 50 Hz or 60 Hz | |
| Variable frequency | 45/55 Hz · 47.5/52.5 Hz · 55/65 Hz · 57.5/62.5 Hz | |
| Data storage | 200 test records on board | |
| Printing | Built-in thermal printer | |
| Data download | USB interface | |
| Power supply | Customized AC 220 V / 230 V / 120 V / 127 V ±10 %, 1-phase, 50/60 Hz | |
| Operating temperature | −10 … +50 | °C |
| Storage temperature | −20 … +60 | °C |
| Dimensions (host) | 350 × 270 × 270 | mm |
| Weight (host) | 22.8 | kg |
| Safety | Designed in accordance with IEC 61010-1 | |
| EMC | Light industrial IEC 61326 | |
Key Features
Fully automatic 12 kV insulation test set
Measures dissipation factor (tan δ), power factor, capacitance (Cx) and CVT ratio on transformers, bushings, circuit breakers, cables, rotating-machine windings and CVTs.
UST / GST / GSTg test modes
Selectable connection modes confine the measurement to the specific insulation under test, e.g. isolating a bushing from the winding.
High-voltage internal source
0.5–12 kV output with ±(reading × 1 %) accuracy, 100 V resolution, up to 200 mA / 2000 VA.
Self-excitation power source
AC 0–50 V / 15 A output extends test coverage without additional equipment.
Capacitance measurement to 60 nF at 12 kV
15 pF – 60 nF range with ±(reading × 1 % + 1.00 pF) accuracy and 0.001 pF resolution.
Automatic dissipation-factor balancing
Reduces test time while providing high-resolution, stable results.
CVT ratio test
Measures ratio of CVTs with accuracy class 1.0 or 3.0 across a 10–10000 range.
Interference suppression & portable design
Suppression circuits keep results stable in noisy substation environments; 22.8 kg with touch-screen operation, thermal printer and USB download.
Applications
Transformer & bushing insulation testing
Dissipation-factor / power-factor and capacitance measurement to detect moisture, contamination and ageing.
UST / GST / GSTg isolation testing
Isolate bushing C1/C2 or winding-to-ground insulation for a targeted assessment of each insulation element.
CVT ratio verification
Check the ratio of capacitive voltage transformers to detect failed or drifting capacitor elements.
Cables, breakers & rotating machines
Insulation condition assessment on cables, circuit breakers and machine windings.
Predictive maintenance
Routine condition assessment and trending of high-voltage insulation health.
Frequently Asked Questions
What is the difference between tan delta (dissipation factor) and power factor?
Dissipation factor (tan δ) is the ratio of the resistive (loss) current to the capacitive current of the insulation. Power factor (PF) is the cosine of the phase angle between the applied voltage and total current. For good insulation the two values are very close; the TDC-3100 reports both so results can be compared with either nameplate or historical convention.
What do the UST, GST and GSTg test modes mean?
UST (ungrounded specimen test) measures a specimen that is isolated from ground, GST (grounded specimen test) measures a grounded specimen, and GSTg (grounded specimen test with guard) adds a guard connection. They select how the high-voltage and measuring leads are connected so the measurement is confined to the insulation under test — for example isolating the bushing from the transformer winding.
Why is a 12 kV test voltage used?
Up to 12 kV is a common field test level for bushings, CVTs and other insulation. The output is adjustable from 0.5 kV in 100 V steps so the operator can match the test voltage to the component and site requirements.
What is the CVT ratio test used for?
A capacitive voltage transformer (CVT) divides voltage with a capacitive stack. Measuring its ratio checks the condition of the capacitor elements — a ratio change indicates failed or drifting elements. The TDC-3100 supports CVTs with accuracy class 1.0 or 3.0.
Downloads
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