Transformer Turns Ratio Meter – TTRM-1000 / TTRM3-1000 (Single & Three Phase)

The PRAM Electec TTRM-1000 (Single Phase) and TTRM3-1000 (Three Phase) Transformer Turns Ratio Meters are high-precision instruments engineered for accurate, safe, and fast measurement of transformer winding ratios and polarity. Designed using in-house patented technology, these meters offer a new approach in transformer testing with advanced safety features like HT/LT misconnection detection and low-voltage excitation.

Built for reliability in the field and test labs, these compact, portable instruments feature a robust 250mA excitation source and deliver results within 2 seconds in fast mode or use advanced filtering in accurate mode for enhanced precision. Ideal for transformer manufacturers, utilities, and maintenance professionals.

Key Features

• Automatic Turns Ratio & Polarity Measurement
  Fully automatic operation ensures quick and repeatable testing.

• Wide Measuring Range
  Up to 1000:1 turns ratio with 5-digit resolution.

• Dual Testing Modes
  Fast mode for rapid checks (2 sec) and Accurate mode with mathematical filters.

• HT/LT Connection Safety
  Built-in detection prevents damage from reverse connections.

• Low Voltage Operation
  Uses only 37V on HT side for enhanced safety.

• Smart Display & Controls
  16x2 jumbo LCD with four-switch operation for ease of use.

• Inbuilt Protection
  Overcurrent protection for shorted windings.

• Phase Selection Switch (3-Phase Model)
  R, Y, B test selection for easy phase-wise analysis.

• PC Connectivity & Reporting
  Includes user-friendly software for creating PDF reports with your company logo and Excel data export.

Specifications

• Measured Parameters: Turns Ratio, Polarity, % Deviation, LT Voltage, Current

• Ratio Range & Resolution: Up to 1000:1, 5-digit resolution

• Excitation Current: 250 mA

• Accuracy:

  • ±0.1% (Up to 200:1)

  • ±0.5% (201:1 to 500:1)

  • ±1% (501:1 to 1200:1)

• Power Supply: AC 230V ±10%

• Instrument Weight: Approx. 4.5 kg

• Warranty: 1-year carry-in warranty against manufacturing defects

Standard Accessories

• 5-meter test lead with crocodile clamps

• Power cord

• Instruction manual

Ideal For

• Transformer Manufacturers & Repair Facilities

• Electrical Test Labs

• Utility Substation Maintenance

• Panel & Equipment Testing Teams

This Transformer Turns Ratio Meter delivers unmatched reliability, intuitive operation, and high-accuracy testing—making it an essential tool for modern transformer diagnostics.