The PDIC CTR 700 is a microprocessor-based, single phase, automatic, transformer turns-ratio tester. This portable test unit is spe- cifically designed to work with PDIC’s single phase Transformer turns ratio instrument TR100 or three phase Transformer Turns Ratio tester TR300. It measures the turns-ratios of Capacitor Voltage Transformers (CVT’s) up to ratings of 765 KV with 0.15% accu- racy. The CTR 700 determines the transformer turns-ratio using the IEEE C57.12.90 measuring method. It uses a 7500 VAC excita- tion voltage source to accurately measure the turns-ratio of Capacitor Voltage Transformers with a rating of up to 765KV. The transformer turns-ratio is determined by precisely measuring the voltages across the unloaded transformer windings. 

The CTR 700 can measure the turns-ratios of Capacitor Voltage Transformers ranging from 75 to 15,000. The measured turns-ratio, winding polarity, and winding phase angle are displayed on the TR100 or TR300 connected to CTR 700 unit. A transformer’s name- plate voltages can be entered on TR100 or TR300 user interface and the CTR 700 will measure the turns ratio accurately indicating percentage error by comparing the test results with the nameplate voltage values. This convenient feature eliminates any user calculation errors when testing CVT. The CVT-765 can be operated from 100 – 120 Vac or 220 – 240 Vac. The proper voltage can be set using the voltage selection switch on the front panel. CTR 700 is housed in strong field portable ABS plastic case with handle and wheels for easy transportation.

Safety switch with 10’ cable is provided with CTR700 will start the test for the operator safety and also provides the visual indica- tion of the high voltage present on front panel of CTR 700.