ATRT-01-7500 Transformer Turns Ratio Tester

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 from75 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 beentered, 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.

CVT-765	Technical Specifications
TYPE Portable, automatic, CVT, VT, PT turns-ratio tester PHYSICAL SPECIFICATIONS 19.5" x 12" x 17" D (49.5 cm x 30.5 cm x 43.2 cm) INPUT POWER 100 – 120 Vac or 220 – 240 Vac (selectable), 50/60 Hz MEASUREMENT METHOD ANSI/IEEE C57.12.90 RATIO-MEASURING RANGE 75 - 10,000 (5 digit resolution) TURNS-RATIO ACCURACY 75 - 4,999: ±0.25%, 5,000 – 9,999: ±0.35%, 10,000 - 15,000: ±0.5% PHASE ANGLE READING 0-360 degrees, ±0.2 degree accuracy POLARITY In-Phase or Out-of-Phase indication TEST VOLTAGE 7440Vac @ 50ma DISPLAY Back-lit LCD (128 x 64 pixels), viewable in direct sunlight and low light levels COMPUTER INTERFACE RS-232C PC SOFTWARE Windows XP/Vista/7 Transformer Analysis Software (included with purchase) INTERNAL TEST RECORD STORAGE 128 test records. Each record contains 33 readings. EXTERNAL TEST RECORD STORAGE Up to 999 test records on external USB Flash drive. SAFETY Designed to meet IEC 61010A-1 and CAN/CSA C22.2 No. 1010.1-92 Standards ENVIRONMENT Operating: -10ºC to 50ºC (15ºF to +122ºF) Storage: (-30ºC to 70ºC (-22ºF to +158ºF) HUMIDITY (MAX) 90% RH @ 40˚ C (104˚ F) non-condensing ALTITUDE (MAX) 2000m (6562 ft) to full safety specifications CABLES One 50 ft. H cable, one 15 ft. X cable, one power cable, one safety ground cable WARRANTY One year on parts and labor Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).

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