Megger 550005B Transformer Turns Ratio Test Set



Usually ships in 3-4 weeks [?]


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  • Single-phase, Hand-cranked TTR
  • Precision bridge measuring technique
  • Range: 0.001 to 129.999
  • Four decade dials
  • Output: 8V, 50/60 Hz
  • Accuracy: ±0.1%
  • Portable design
  • Exciting current: 0 to 1A
    • Divide by 5 switch for increased resolution

The Megger 550005B Transformer Turns Ratio Test Set measures the turns ratio and exciting current of windings in power, potential and current transformers. Deviations in turns ratio readings indicate problems in one or both windings or the magnetic core circuit.

The single-phase, hand-cranked model measures highly sensitive turns ratios of up to 129.99:1 with accuracy of ±0.1%. An optional auxilary transformer extends the ratio range to 329.99:1. The TTR set operates on the principle that the voltage ratio of the transformer at no load is practically equal to the true turns ratio.

The single phase model is primarily used for testing singlephase power and distribution transformers, for low-ratio readings up to 129.99:1, or up to 329.99:1 with an auxiliary transformer. It can be used to test three-phase transformers by connecting and testing each phase separately.

Megger 550030 Auxiliary Transformer
Auxiliary Transformer, extends ratio range to 329.99 for 550005
Megger 550050 Calibration Reference Transformer
Calibration Reference Transformer for 550005
Megger 26999 Printer Paper
1 roll of printer paper for turns ratio tester
Megger 35788 Transport Case
Semi-hard fabric case for TTR20 & 550005B transformer turns ratio testers
Megger 35755-1 Printer Kit
Battery and line powered serial thermal printer for printing tests results for TTR20-1 & 550005B transformer turns ratio testers