Current Transformer (CT) tester UHV-105

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UHV-105 CT PT Comprehensive Tester is a portable on-site tester for P-class current transformers (CT) and potential/voltage transformers (PT), designed to perform a complete set of verification tests with integrated data recording and printing. It features an LCD display, a built-in mini printer for field printing, USB data export and simple operation.

Product Features & Advantages

• Standards compliance: meets GB 20840.3-2013 and GB 20840.2-2014 requirements for CT/PT verification.
• Complete testing solution: performs all listed test items independently without external devices.
• On-site printing: integrated high-speed micro printer for immediate hardcopy results.
• Intuitive control: smart controller with graphical interface for straightforward operation.
• Clear display: large LCD presenting test data and graphical results.
• Automatic calculations: automatic determination of excitation knee point values in accordance with standards.
• Error curve generation: automatic plotting of 5% and 10% error curves for compliance analysis.
• Data retention: stores up to 3,000 test records with power-loss protection.
• Data export: USB interface for data dump and report generation (Word).
• Field-ready design: compact form factor optimized for mobile operation; nominal weight ≤ 30 kg.
• Protections: multiple safeguards for equipment and operator safety.

Function Table (CT / PT)

• CT (Current Transformer):
• Magnetization curve (excitation characteristic)
• Transformation ratio test
• Polarity check
• 5% and 10% error curve generation
• Current injection
• Degauss (demagnetization)
• Withstand test at power frequency (AC)
• Automatic calculation of excitation knee point value
• PT (Voltage/Potential Transformer):
• Excitation characteristic test
• Transformation ratio test
• Polarity check
• Withstand test at power frequency
• Degauss (demagnetization)
• Calculation of knee point value

Specifications

• Operational power supply: AC 220V ±20V, 50–60Hz
• Equipment output waveform: sine wave
• Output voltage for excitation characteristic: 0–1200 V
• Excitation output current range: 0–20 A
• Output current for transformation ratio test: 0–1000 A
• CT ratio measurement range: 5–25000 A/5 A (5000 A/1 A)
• PT ratio measurement range: 1–500 kV
• Measurement error: ≤ 0.5% (0.2% * reading + 0.3% * range)
• Operating temperature: -10 ℃ to +40 ℃
• Relative humidity: < 90% RH
• Altitude: ≤ 1000 m
• Dimensions (L×W×H): 450 × 280 × 260 mm
• Weight: ≤ 30 kg
• Data storage: up to 3,000 test records with power-loss protection
• Interfaces: built-in mini printer; USB flash drive support for data export and report generation

Core detection function

• Variable ratio test: Accurately measure the current ratio or voltage ratio of the transformer, verify whether it meets the design parameters (such as 50/5A, 10000/100V, etc.), and ensure the accuracy of the metering or protection system.
• Polarity judgment: Detect the phase relationship (same polarity or opposite polarity) between the primary and secondary sides of the transformer to avoid misoperation of the protection device or measurement errors caused by polarity errors.
• Excitation characteristic test: By applying different voltages/currents, draw the excitation curve of the transformer, analyze its core saturation characteristics, and evaluate whether the magnetic circuit design is reasonable.
• Error measurement: Measure the ratio difference (deviation between actual ratio and nominal ratio) and angle difference (phase deviation) to ensure that the accuracy of the transformer under rated load meets the standards (such as 0.2 level, 0.5 level).