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CTPT.405 Current & Protection Transformer Analyser

The CTPT.405 is a comprehensive CT/PT analyser designed for complete diagnostic testing of current transformers and potential transformers in substations, industrial plants, and utility environments.
It performs excitation, turns ratio, error testing, polarity checks, winding resistance, burden measurement, transient testing, knee-point analysis, and hysteresis loop capture — all in one instrument.

With automated testing sequences, high-accuracy DSP sampling, advanced IEC-compliant evaluation, multi-record reporting, and large internal storage, the CTPT.405 is engineered for fast, reliable field diagnostics and calibration work.

Key Features

CT Testing Capabilities

  • Excitation curve & knee-point parameter test

  • Turns ratio test

  • Ratio error & phase error test

  • Polarity mark check

  • Winding resistance measurement

  • Secondary loop burden measurement

  • Protection CT error-line curve test

  • Transient CT parameter testing

  • CT nameplate guess / parameter identification

  • Saturation hysteresis loop curve measurement

PT Testing Capabilities

  • Turns ratio test

  • Ratio & phase angle error test

  • Polarity test

  • Secondary burden test

  • Winding resistance test

General Features

  • Evaluates CT/PT according to IEC rules

  • Automatic generation of Word test reports

  • Batch report creation for multi-group records

  • Compare excitation curves in a single window

  • Calculates ratio & phase errors at rated burden and working burden simultaneously

  • Memory capacity >1000 test groups

  • Rugged, field-portable design

Technical Specifications

Standards

  • IEC60044-1

  • IEC60044-6

  • IEC60044-2

  • IEC60044-5

  • IEEE C57.13

Power & Output

  • Power Supply: AC 220 V ±10%, 50/60 Hz ±10%

  • Voltage Output: 0.1–180 V (AC)

  • Current Output: 0.001–5 A (RMS)

  • Power Output: 500 VA

  • Max Knee-Voltage Measurement: 45 kV

Measurement Functions

Current Measurement

  • Range: 0–10 A

  • Auto-ranges: 0.1 / 0.4 / 2 / 10 A

  • Accuracy: < ±0.1% + 0.01% FS

Voltage Measurement

  • Range: 0–200 V

  • Auto-ranges: 1 / 10 / 70 / 200 V

  • Accuracy: < ±0.1% + 0.01% FS

Turns Ratio Measurement

  • Range:

    • 1–5000 → error < 0.05%

    • 5000–35000 → error < 0.1%

Phase Measurement

  • Error: ±2 minutes

  • Resolution: 0.01 minutes

Winding Resistance

  • Range: 0–8 kΩ

  • Auto-ranges: 2 Ω / 20 Ω / 80 Ω / 800 Ω / 8 kΩ

  • Accuracy: <0.2% RDG + 0.02% FS

  • Resolution: 0.1 mΩ

Temperature Measurement

  • Range: –50 °C to +100 °C

  • Accuracy: <3 °C

CT Secondary Burden

  • Range: 0–160 Ω

  • Auto-ranges: 2 Ω / 20 Ω / 80 Ω / 160 Ω

  • Accuracy: <0.2% RDG + 0.02% FS

  • Resolution: 0.001 Ω

PT Secondary Burden

  • Range: 0–80 kΩ

  • Auto-ranges: 800 Ω / 8 kΩ / 80 kΩ

  • Accuracy: <0.2% RDG + 0.02% FS

  • Resolution: 0.1 Ω

PT Ratio

  • Range:

    • 1–10000 → error < 0.1%

    • 10000–35000 → error < 0.2%

PT Phase Angle

  • Max Error: <3 minutes

Evaluation & Reporting

  • Automatic IEC evaluation

  • Auto Word report generator

  • Multi-group reporting in one operation

  • Curve comparison (excitation, saturation)

  • Calculates ratio & phase errors at rated and actual burden

General

  • Memory: >1000 test groups

  • Operating Temperature: –10 °C to +50 °C

  • Humidity: ≤90%

  • Size: 485 × 356 × 183 mm

  • Weight: <15 kg

Standard Accessories

  • Complete CT/PT test lead set

  • Power cable

  • Ground cable

  • USB data cable

  • Thermal printer paper

  • Protective carry case

  • Calibration certificate

  • User manual

Applications

  • CT nameplate verification

  • CT/PT parameter inspection under working burden

  • CT transient parameter analysis

  • Calibration of CT ratio & phase displacement

  • Full routine PT testing

 

Optional Accessories

  • Extended 10 m / 20 m / 30 m leads

  • External burden box

  • Rugged trolley case

  • PC reporting / data management software

  • HV cable upgrade package

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