IEC Portable Transformer SFRA Analyzer Frequency Response Analysis Instrument

Why are traditional testing methods insufficient?

Conventional insulation resistance and DC resistance tests, although basic, are difficult to identify small displacements or distortions inside the winding. 

They can only provide information on "on/off" or "resistance", and cannot present structural features such as frequency response curves. This is like relying solely on measuring body temperature to determine whether internal organs are damaged - it is not direct or comprehensive enough.

What have we solved?

This device adopts the sweep frequency response analysis method, which measures the amplitude frequency and phase frequency response curves by injecting signals of different frequencies into the winding. Once the structure changes, there will be differences in the shape of the curve. We use data to 'draw' these differences, making the hidden deformation issues clear at a glance.

Why choose this instrument?

1. Support multi standard testing: Simultaneously compatible with mainstream standards such as DL/T911-2016 and GB/T 1094.18 (IEC60076-18:2012), without the need to repeatedly switch devices on site.

   
   

2. Wide high-frequency coverage: The frequency range is from 10Hz to 10MHz, especially suitable for detecting slight deformations and mid to high frequency anomalies.

   
   

3. Easy on-site operation: equipped with a color touch screen, Chinese/English interface switching, and real-time printing function, making it easy for testers to get started.

   
   

4. Data traceability: can save up to 40 sets of winding deformation data, supports USB export, and works with PC software for horizontal comparative analysis.

   
   

5. Suitable for multiple wiring methods: Supports common transformer wiring methods such as Yn, Y, Δ, III, etc., suitable for high voltage, medium voltage, and low voltage side windings.

Technical Specifications

Features

• Two excitation modes: Internal (signal generated by the instrument) and external (external signal generator), adapting to different site conditions.

• Corfficient coefficient analysis: Calculates R values for low, mid, and high frequency bands, automatically indicating deformation level (normal / mild / significant / severe).

• Phase difference measurement: Measures both amplitude and phase difference (-180°～+180°), offering a fuller picture of winding characteristics.

• High repeatability: 99.5% repeatability rate for same-phase tests, ensuring stable and reliable data.

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