The TR 300 is a true three-phase transformer turns ratio test instrument designed to test any type of transformer. It performs turns ratio tests per the IEEE C57.12.90 & IEC 60076-1 measurement standard for three phase or single phase oil filled transformers. TR300 is also suitable for testing dry type transformers single or three phase transformers per Standards IEEE C57.12.91 and IEC 60076-1 for Measuring ratios, polarity, phase angle and vector group of  Single phase and Three-phase  The TR 300 generates its own three-phase excitation test voltage which is applied to the three phases of the transformer’s primary windings. The three-phase secondary voltages are measured to calculate the turns ratio. The TR 300’s measuring range is 0.75-50,000. In addition to measuring turns ratio, the TR 300 can also measure excitation current, winding polarity and phase angle difference between the primary and secondary voltages. The test results can be displayed on the unit’s built in touch color display.

Features : 

• Selectable test voltages: 4, 12, 40, 100 & 250 VAC & user defined (optional)
• Measurement range 0.75 – 50 000 with 0.1% accuracy
• Built in 3.5” thermal printer
• True three-phase voltage measurement
• Stores up to 128 test results with up to 99 readings for each test
• Magnetic Balance Test (optional)
• Automatic vector group detection
• Built-in tap changer control
• Battery backup for up to 3 hours of operation (optional)
• Records excitation current, phase angle & Polarity
• IP-67 Enclosure