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EuroSMC Model ETP-1 Transformer Turn Ratio Measurement Unit


The ETP-1 module determines the turn ratio on the three phases of power and distribution transformers and auto-transformers of any type applying a test voltage on the high-voltage winding and measuring the resulting voltage on the low-voltage winding. This method also provides the evaluation of other parameters.

  • Excitation current I1.
  • Phase angle between the test voltage V1 and the excitation current I1.
  • Phase angle between the test voltage V1 and the measured V2.

The test is performed at low voltage and at the supply’s frequency, which makes the ETP-1 adequate for field testing and for quality assessment in production lines. The following problems can be detected with the ETP-1:

  • Shorted turns.
  • Interrupted windings.
  • Magnetic core problems.
  • Dirty or damaged tap changer.

Database storage of results enables individual tracking of each transformer


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SKU: EuroSMC Model ETP-1 Category: Tag:

EuroSMC Model ETP-1 Characteristics

  • The connection to the transformer taps is guided from the computer to avoid connection errors.
  • Enables to select the number of the tap changer positions to be measured, as the software informs the position that should be measured each time.
  • For each tap changer position, a three phase automatic measurement is performed. It is not necessary to change the connection to the transformer taps.
  • The no load test current waveform is presented on the computer screen. It detects possible problems in the iron core.
  • The test time for each three phase test position is less than 10 seconds.
  • The measuring range has a ratio between 1:1 to 3000:1.


  • Measures the trip time in protective relays.
  • Measures the time of contact operation.
  • Measures the duration of a single pulse.
Item Measurement Resolution Accuracy
Measurement Ranges Turn Ratio: 0.9:3000, 7 scales 4-1/2 digits ±0.3% of reading ±2 digits
Current: 3.1:2000mA Rms, 6 scales 3 digits ±1% of reading ±2 digits
Phase Angle: -180° +180° 3 digits ±0.15°
Test Signal Voltage: 115 Volts Rms
Current: less than 2 Amps Rms
Measurement Time Single-Phase: 20 to 35 sec. depending on mode
Three-Phase: 60 to 90 sec. depending on mode
Measurement Modes High to Low ratio
High to Tertiary ratio
General Specifications
Power Supply 115V ±10% 50/60Hz (specify); 230V ±10% 50/60Hz (specify)
Working Temperature 5°C to 35°C; 10 to 80% R.H. non-condensing
Storage Temperature 5°C to 75°C; 10 to 80% R.H. non-condensing
Dimensions 40cm (D) x 45cm (W) x 13.5cm (H)
Weight 13kg
Standard Accessories
Leads Test Leads
Cables Communication cable
Bags Transportation bags
Certificates Calibration certificates
Manual User’s manual
Ordering Information
Model Name Description
EuroSMC ETP-1 Transformer Turn Ratio Measurement Unit


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