• Standalone or computer-controlled
• Can test CVT's rated up to 765 KV
• Displays turns-ratios from 75-15,000
• Calculates turns-ratio percentage error when nameplate voltages are provided

The Vanguard CVT-765 is a microprocessor-based, single phase, automatic, transformer turns-ratio tester. This portable test unit is specifically designed to measure the turns-ratios of Voltage Transformers (VT’s), Potential Transformers (PT’s), and Capacitor Voltage Transformers (CVT’s).

The CVT-765 determines the transformer turns-ratio using the IEEE C57.12.90 measuring method. It uses a 7500Vac excitation 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 CVT-765 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 unit’s LCD screen.

The CVT-765 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 unit’s LCD screen.

A transformer’s nameplate voltages can also be

entered, and the CVT-765 will display the turnsratio

percentage error by comparing the test

results with the nameplate voltage values. This

convenient feature eliminates any user calculation

errors when testing transformers.

User Interface

The CVT-765 features a back-lit LCD (128 x 64

pixels) screen that is viewable in bright sunlight

and low-light conditions. A rugged 16-key membrane

keypad is used to enter test information

and to operate the unit.

Test Record Storage

The CVT-765 can store 128 records of 33 readings

internally, and up to 999 test records on an

external USB Flash drive. Test records can be

recalled using the included Transformer Analysis

PC Software.

Computer Interface

Windows®-based Transformer Analysis software

is provided with each unit. Using this software,

the user can retrieve test records from the

CVT-765 via the RS-232C interface or by using a

USB Flash drive, analyze test results, and print

test results on a desktop printer. Test results are

automatically exported to PDF, EXCEL, and XML

formats

Operating Voltages

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.

Part number CVT-765 CVT-765 with test cables