Megger 550005B Transformer Turns Ratio Test Set
Single-phase, Hand-cranked TTR, 0.001 to 129.999 range, precision bridge measuring technique
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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.