A transformer turns ratio test set such as the TTR20-1 can directly measure the turns ratio of single-phase transformers as well as three-phase transformers. Deviations in these measurements will quickly indicate problems in transformer windings and in the magnetic core circuits. Transformer ratio can change due to several factors, including physical damage from faults, deteriorated insulation, contamination and shipping damage. If a transformer ratio deviates more than 0.5 percent from the rated nameplate ratio, it may have a fault, which reflects in inefficient or improper operation. To measure small ratio changes such as this, the accuracy of a Megger TTR20-1 is needed. Please check our Huge Inventory with savings of up to 80% off of retail on Cat5/5e/6 LAN Cable Certifiers and Fiber Op.
eBay