Potential/Voltage Transformer (PT) tester UHV-107

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The UHV-107 is a volt-ampere characteristic tester designed for automated testing of protection-class and metering-class current transformers (CTs) and potential transformers (PTs), suitable for laboratory and on-site field work.

Key features

• All-in-one operation: performs excitation curves, ratio measurement, polarity check, demagnetization, 5%/10% error curves, secondary burden and AC withstand tests without external equipment.
• Automated analysis: automatic detection of the excitation knee-point and automatic generation of 5%/10% error curves.
• Intuitive interface: smart controller with large graphical LCD for simplified operation.
• On-site reporting: integrated micro-thermal printer for immediate result printouts.
• Advanced data management: stores up to 3,000 test sets with battery-backed retention and supports USB export to generate Word reports on standard PCs.
• Field-optimized design: compact, portable construction for convenient on-site testing.

Technical specifications

• Power supply: AC 220V ±10%, 50Hz
• Device output (voltage/current): 0 ~ 2500 V (peak value, up to 20 A). Note: 0–5 A = true value; >5 A to 20 A = calculated value.
• High current output: 0 ~ 600 A
• Excitation measurement accuracy: ≤ 1.0% (0.5% × reading + 0.5% × range)
• CT ratio measurement range: ≤ 3000 A/1 A (equivalent to 15000 A/5 A)
• CT ratio accuracy: ≤ 0.5%
• PT ratio measurement range: ≤ 500 kV
• PT ratio accuracy: ≤ 0.5%
• Operating environment — Temperature: -10 ℃ to 40 ℃; Humidity: ≤ 90%; Altitude: ≤ 1000 m
• Dimensions: 410 mm × 260 mm × 340 mm
• Weight: ≤ 25 kg

Applicable scenarios

• Manufacturing process: The transformer manufacturer uses it for factory inspection to ensure that the product performance meets the standards.
• Installation and debugging: Verify the compatibility between the transformer and the system during on-site installation.
• Regular maintenance: The power company conducts preventive tests on operating equipment to extend its lifespan.
• Troubleshooting: Quickly locate the cause of transformer faults (such as insulation breakdown, secondary open circuit), and guide maintenance or replacement.

Regular maintenance

• 1. Calibration: The transformer tester should be calibrated regularly to ensure testing accuracy. Calibration should be carried out according to the requirements of the instrument manual, and the calibration results should be recorded and saved.
• 2. Battery replacement: The transformer tester is powered by batteries and should be regularly replaced to ensure normal use of the instrument. When replacing the battery, follow the instructions in the instrument manual to avoid battery short circuits or other safety issues.
• 3. Replace fuses: The transformer tester uses fuses to protect the circuit, and fuses should be replaced regularly to ensure the normal use of the instrument. When replacing fuses, follow the instructions in the instrument manual to avoid circuit short circuits or other safety issues.
• 4. Check the connecting wires: The transformer tester uses connecting wires to connect the tested equipment, and the joints of the connecting wires should be regularly checked for looseness or corrosion to ensure testing accuracy and safety.