These automatic microprocessor based transformer ratio meter is the on the first automatic ratio meter in the country giving digital display of ratio directly. Our transformer ratio meter requires no balancing while working and also provides with accurate measuring of the voltage transformation ratio of single phase/3-phase delta or star connected transformers, CTs & PTs, power transformers.

• Test voltage: The Instrument provides 3 isolated test voltages of 48V & 4.8V, which enable the testing of both power transformers & Cts
• Display: 4½ digit LCD displays the ratio i.e. ratio of high voltage winding to low voltage winding at low flux in the core displayed in three ranges i.e.1-10,10-100,100 1000,1000-10000 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: The instrument is protected against any wrong connection across the transformer and Fast acting VBO trips in case of stepping up of test voltage
• Keypad & LCD Display: Provided for displaying keyboard selected parameter, error/warning messages like incorrect connection, accidental step up mis connection, low battery for user friendly functioning, etc.
• Fully auto operation
• No balancing is required
• Measures and displays transformer ratio, excitation current, Phase Angle polarity
• Primary Secondary, Continuity or any short circuit
• LCD display
• 4½ digit LED/LCD display of ratio.
• True 4 terminal measurement.
• Resolution of 0.001 in the range 10.
• Can be used to measure 3,1 phase delta, star connected transformer.
• Fully protected against any wrong connections.
• Built in printer (24 column) for on- site printouts

Transformer Winding Resistance Meter is designed to measure the winding resistance of transformers, Inductors, generators and motor windings and Tap Changers. It is specially designed for highly inductive objects like 400KV/220KV. We take care in measuring 3 phase transformers by using band switch matrix, to avoid climbing on transformers for safe & measurements. This is only indigenous TWRM which gives very fast readings for 3Phase Star-Delta any combination Transformers. It is equipped in open circuit Voltage of DC Supply which ensures that core of the transformer is saturated for fast measurements to be taken.

Moreover, utmost care is taken to absorb the Back emf of such transformers and the Indication for discharges is provided on front panel for user safety, if the current through winding under measurement is disturbed/ discontinued. It has a built in 10A regulated and highly stable current source with current election of 10Amp, 1Amp, 0.1Amp & 0.01Amp. Moreover, it uses ratio-metric circuit where the resistance of specimen is compared with known internal standard and 4 ½ digit LED/ LCD display is provided for resistance measurement in milliohms and in ohms. The salient features are of transformer winding resistance meters are as follows:

• Easy & Fast switching for 3 phase to avoid changing Primary-Secondary, Band switch is provided on front panel.
• Regulated and highly stable 10 Amp, 1Amp,0.1Amp & 0.01Amp current source.
• 4½ digit LED/LCD display
• Simultaneous measurements of voltage & current.
• True four terminal measurement
• Resolution of 0.1 micro ohm
• Protection against inductive kickback and discharge.
• Visual indication for discharge
• Line voltage interference suppression, making instrument most suitable for field applications
• Light weight with carrying case & with 10 meter leads.
• Inbuilt Printer, RS232 port.