Speed Up Transformer Diagnostics with a Sweep Frequency Response Analyzer

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n the past, transformer diagnostics required a lot of manpower, time and complicated machinery. Most transformers are inside a tank filled with insulation oil. You have to remove the transformer from the tank in order to effectively test and inspect the transformer. This means you have to use a machine to lift the core and several men assisting. This translates to higher labor costs and wasted time. With the advancement of technology, you can now test transformers in a matter of minutes without untanking. 

Sweep Frequency Response Analysis is a method of diagnosing problems in transformers without untanking. It detects internal problems by injecting a test signal to the windings of the transformer. The resistive-inductive-capacitive characteristics of different parts of the transformer components then resonates and gives out a distinctive band of frequencies. The tester captures these frequencies for the technician to compare to the transformer nameplate values. Even the smallest changes in geometry of the transformer components will cause a significant deviation from the baseline data.

If you need an SFRA, you might be interested in some of these Sweep Frequency Response Analyzers. These devices are some of the best on the market today and offer excellent reliability and measurement accuracy. 

Doble M5200

The M5200 can help you diagnose problems early and prevent premature failure of equipment. It can detect problems such as shorted or open windings, faulty core grounds, partial collapse of windings, movement of the core and hoop buckling,

Technical Details

  •        1 channel for excitation source and 2 channels  for measurement
  •        Has a frequency range of 10 Hz up to 25 Mhz
  •        Excitation source can out out 20 Volts peak-to-peak at 50 Ω impedance
  •        Short circuit protection on the excitation output
  •        100 MS/s sampling rate for the measurement channel
  •        LAN and USB port for PC communications
  •        1000 points at 1.2 % Logarithmic point spacing
  •        ±1 dB to -80 dB repeatability
  •        Has an IF bandwidth of <10% of the active frequency
  •        Displays measurements on Linear or Logarithmic
  •        Frequency vs Magnitude or phase plotting
  •        Sub band, difference and cross-correlation analysis
  •        Will require calibration every 2 years
  •        Comes with the following:

o   LAN crossover cable

o   User manual

o   Software

o   Lead bag

o   Power and ground cord

o   Lead set

Doble M5400 SFRA

The M5400 is similar to the M5200 but requires less maintenance. The calibration interval for the M5400 is every 3 years compared to the M5200 which is 2 years.

Technical Details

  •        1 channel for excitation source and 2 channels  for measurement
  •        Has a frequency range of 10 Hz up to 25 Mhz
  •        Excitation source can out out 20 Volts peak-to-peak at 50 Ω impedance
  •        Short circuit protection on the excitation output
  •        100 MS/s sampling rate for the measurement channel
  •        LAN, serial and USB port for PC communications
  •        1000 points at 1.2 % Logarithmic point spacing
  •        ±1 dB to -80 dB repeatability
  •        Has an IF bandwidth of <10% of the active frequency
  •        Displays measurements on Linear or Logarithmic
  •        Frequency vs Magnitude or phase plotting
  •        Sub band, difference and cross-correlation analysis
  •        Will require calibration every 3 years
  •        Comes with the following:

o   LAN crossover cable

o   User manual

o   Software

o   USB cable

o   Power and ground cord

o   Lead set

Megger FRAX 101

The FRAX 101 offers excellent accuracy in measuring a wide range of frequencies with high dynamics. It is designed to be rugged, reject interference and has one of the highest dynamic range in the industry.

Technical Details

  •        1-10MHz frequency range up to 25MHz for extended range
  •        32,000 points with logarithmic, linear or both points spacing
  •        >125dB dynamic range
  •        Bluetooth and USB PC connections
  •        Requires calibration every 3 years
  •        100 MS/s sampling rate
  •        50 Ω input and output impedance
  •        0.2-20 Volts peak-to-peak compliance voltage

Protec can supply you with a wide range of transformer testers and other electrical test equipment. We offer equipment sales, test equipment rental and leasing services. Contact a Protec representative today at 1-866-352-5550 for more details.