Microprocessor based Automatic Ratio Meter is the first automatic ratio meter in the country giving digital display of ratio directly.The instrument without any need of balancing precisely & accurately measures the voltage transformation ratio of single phase/3-phase delta or star, without neutral, Zig zag connected transformers, CTs & PTs, Power Transformers.

Test Voltage

The Instrument provides isolated test AC voltages of 8V,40V,80V, which enable the testing of both power transformers & Cts..

Display

LCD displays the ratio i.e. ratio of high voltage winding to low voltage winding at low ux in the core. Ratio is displayed in 0.8 – 12000 ** by auto ranging.

Principle of Operation

This micro-processor based Instrument uses ratio-metric circuit in which the ratio of test specimen is compared with known internal standard.

Protection

Instrument is protected against any wrong connection across the transformer. Fast acting VBO trips in case of stepping up of test voltage.

Keypad & LCD Display

This is provided for displaying keyboard selected parameter,error/warning messages like incorrect connection, accidental step up misconnection,for user friendly functioning etc.

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• 1. Fully auto operation, No balancing is required. Suitable for 765 kV yards.


• 2. Measures and displays turn ratio Phase angle, Vector group, Excitation current,Polarity & Pass / Fail for Ratio reading with Calculated ratio.


• 3. LCD Display, automatic Vector Group Detection.


• 4. RS232 Port to down load data and remote operation through PC.


• 5. Inbuilt Memory for 100 test results.


• 6. Resolution of 0.001 in the range 10


• 7. Can be used to measure 3,1 phase delta,star connected transformer.


• 8. Can be used for Without neutral and Zigzag Transformer.


• 9. Polarity Detection.


• 10. Fully protected against any wrong connections.


• 11. Built in Thermal printer for on-site printouts.


• 12. Temperature Range -10°C to 55°C


• 13. Storage Temp Range -20°C to 70°C


• 14. Humidity 5% to 95% RH, non condensing.

• 1. POWER SUPPLY : 230V AC ±10%,50Hz ±5%


• 2. Voltage : 8V, 40V, 80V AC Selectable **


• 3. Ratio Range : 0.8 to 12000**


• 4. Ratio Accuracy: ± 0.1% ± 2digits


• 5. Indication : LCD display of ratio


• 6. Phase Angle : ± 90°


• 7. Resolution : 0.01°


• 8. Accuracy : ± 0.5°


• 9. Ex. Current : 500mA @ 8V


• 10. Accuracy : ± 1mA


• 11. Resolution : 0.1mA


• 12. Storage Memory: Built in upto 100 test results.


• 13. Port : RS232C POR


• 14. Software : Windows Based


• 15. Three Phase Test Cables: 15 meter long


• 16. Power Supply Cord : 10 meter


• 17. Ground Cable : 10 meter


• 18. Instruction Manual : English 2 No.


• 19. Calibration Certicate: Traceable to STQC Lab.


• 20. Safety Specications: IEC 61010 COMPLIED.


• 21. EMI/EMC Specications: IEC/EN 61326 COMPLIED.


• 22. Vibration Test : IEC60068-2-6 COMPLIED


• 23. Shock Test : IEC60068-2-27 COMPLIED


• 24. Bump Test : IEC60068-2-29 COMPLIED


• 25. Damp Heat Test : IEC60068-2-78 COMPLIED


• 26. Weight : < 10Kg