The Doble M5200 Sweep Frequency Response Analyzer (SFRA) detects mechanical failure or movement of windings due to short circuits, mechanical stresses or transportation
The M5200 uses Sweep Frequency Response Analysis, a proven technique for making accurate and repeatable measurements. Pioneered by Doble the sweep approach has become the industry standard and is the preferred method for making frequency domain measurements. Use the SFRA to ensure transformer performance, reduce maintenance cost, and increase the service life of transformers.
Here’s how SFRA works: The M5200 sends an excitation signal into the transformer and measures the returning signals across a broad frequency range. By comparing this response to baseline and other results (such as from similar units), you can identify deviations and confi rm internal mechanical problems.
DIAGNOSE problems early. PREVENT expensive equipment failures. Take CONTROL.
Why wait for problems to develop? With the M5200’s non-intrusive test technique, you can test your power apparatus any time you suspect a problem. Or just use it as part of your regular maintenance program.
Either way, you identify problems before they lead to failure, such as:
- Core movement
- Winding deformation and displacement
- Faulty core grounds
- Partial winding collapse
- Hoop buckling
- Broken or loosened clamping structures
- Shorted turns and open windings
Range – The M5200 provides a frequency response measurement from 10 Hz to 25 MHz. Doble recommends the default setting of 20 Hz – 2 MHz for transformers as there is limited diagnostic value in measurements outside of this range. The diagnostic frequency range of 20 Hz to 2 MHz covers the most important diagnostic areas:
- Core and Magnetic Properties
- Winding Movement and Deformation
- Interconnections – Leads and Tap Changers
Resolution – The M5200 measures the frequency response at logarithmically spaced frequency intervals of 1.2%. A constant excitation level is maintained for each frequency measurement. The M5200 has the ability to auto-scale each frequency measurement providing an overall dynamic range of 80 dB with a ±1 dB accuracy. This gives the highest combination of dynamic range and accuracy available.
Repeatability – The M5200 is a fi eld-ready instrument for high quality measurements. The sweep frequency approach combined with Doble’s world class engineering means that frequency response mea-surements are highly repeatable and even subtle changes can be used for diagnostic purposes.
Test Leads – We provide simple, robust test leads to handle the rigors of site testing. International tests have proven repeatedly that we have the most reliable and repeatable test leads available.
Practicality – The M5200 is supported by Doble’s world class Client Service Engineers and decades of fi eld experience. We have learned through practice and experimentation what constitutes good fi eld technique and know how to gain value and benefi t from the SFRA measurement. Let us work with you to bring that value and benefi t to your company!
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