Current Transformer (CT) analyzer UHV-109

Potential/Voltage Transformer (PT)for electrical networkslaboratory

The UHV-109 CT/PT Polarity Tester is a portable automated instrument for verification of protection-class (P-class) and metering-class current transformers (CTs) and potential transformers (PTs) in laboratory and field environments.

Key features

• Automated polarity and characteristic testing for CTs and PTs (single‑unit operation without external auxiliary equipment).
• Compliant with GB 20840.3-2013, GB 20840.2-2014 and related IEC/GB regulations.
• Automatic detection of CT/PT excitation inflection (knee) point and automatic generation of 5% and 10% error curves.
• Integrated fast thermal printer for immediate on-site printouts.
• Intelligent controller and large graphical LCD for simplified field operation.
• Internal battery-backed memory storing up to 3,000 test records; data retained after power loss.
• USB export and one-click Word report generation on a standard PC for documentation and certification.
• Compact, lightweight design suitable for laboratory and on-site commissioning (portable).

Technical specifications

• Operating power: AC 220V ±10%, 50 Hz.
• Device output (voltage): 0 ~ 2500 V (current limit adjustable, max 20 A).
• High-current output: 0 ~ 1000 A.
• Excitation (magnetization) measurement accuracy: ≤ 0.5% (0.3% × reading + 0.2% × range).
• CT ratio measurement range: ≤ 5000 A/1 A (25,000 A/5 A); CT ratio accuracy: ≤ 0.5%.
• PT ratio measurement range: 5 ~ 220 kV; PT ratio accuracy: ≤ 0.5%.
• Working environment: temperature −10 ℃ to 40 ℃; humidity ≤ 90%; altitude ≤ 1000 m.
• Dimensions (W×D×H): 410 mm × 260 mm × 340 mm.
• Weight: ≤ 25 kg (functional/portable weight indicated as ≤ 22 kg in operational description).

Routine maintenance

• 1. Cleaning: The transformer tester should be regularly cleaned to keep the surface of the instrument clean and tidy. When cleaning, a clean soft cloth or cotton cloth should be used, and cleaning agents containing acid, alkali, or other corrosive substances should be avoided.
• 2. Dust prevention: The transformer tester should be placed in a dry, ventilated, and dust-free environment to prevent dust and debris from entering the instrument and affecting the testing accuracy.
• 3. Moisture proof: The transformer tester should be avoided from being placed in a damp environment for a long time to avoid affecting the normal use of the instrument. If the instrument is damp, it should be dried in a timely manner.
• 4. Shock resistance: The transformer tester should avoid severe vibrations and collisions during use to avoid affecting testing accuracy and instrument lifespan.