Current Transformer (CT) analyzer UHV-300 CT PT

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UHV-300 CT PT Volt-ampere Characteristic Analyzer is a professional test instrument for CT (current transformer) and PT (potential transformer) testing in the power industry, based on high-performance DSP and ARM platforms and advanced manufacturing processes. It is designed to measure excitation (volt-ampere) characteristics, ratio, polarity, secondary winding resistance, secondary load, ratio error and phase angle error, and to provide automated analysis of CT/PT parameters.

Main features

• Comprehensive testing for CT types (protection, metering, TP): excitation characteristics, ratio, polarity, secondary winding resistance, secondary load, ratio error and phase angle error; also applicable to PT excitation and related tests.
• Automatic calculation and display of CT/PT parameters: knee voltage/current, 10% (5%) error curve, accuracy limit factor (ALF), instrument security factor (FS), secondary time constant (Ts), remanence coefficient (Kr), and saturated/unsaturated inductance identification.
• Compliant with IEC60044-1 and IEC60044-6 CT/PT standards.
• Advanced low-frequency test theory enabling CT knee point testing up to 30 kV (depending on configuration).
• Data storage: non-volatile memory for up to 2000 test records; export via USB/U-disk to PC; analysis software can generate Word reports.
• Simple operation: one-button execution of common CT tests (resistance, excitation, ratio, polarity); uniform wiring for most tests.
• Portable design: instrument weight ≤ 9 kg for field use.

Aliases / alternative names

• CT/PT tester
• CT volt-ampere tester
• CT characteristic tester
• CT analyzer

Characteristics / technical specifications

• Testing purpose: Protective CT
• Output: 0–180 Vrms, 12 Arms, 36 A (peak)
• Voltage measurement accuracy: ±0.2%
• CT ratio measurement — Range: 1–30000; Accuracy: ±0.2%
• PT ratio measurement — Range: 1–10000; Accuracy: ±0.2%
• Phase measurement — Resolution: 0.5 min; Accuracy: ±5 min
• Secondary winding resistance measurement — Range: 0–300 Ω; Accuracy: 2% ± 2 mΩ
• AC load measurement — Range: 0–300 VA; Accuracy: 2% ± 0.2 VA
• Input supply voltage: AC 220 V ±10%, 50 Hz
• Operating environment: Temperature -10 ℃ to 50 ℃, humidity ≤ 90%
• Dimensions & weight: 340 × 300 × 150 mm; weight ≤ 9 kg

Safety precautions

• 1. To protect equipment and personal safety, please read the user manual carefully and strictly follow the instructions before conducting the experiment.
• 2. Do not place this instrument on an unstable platform or desktop to prevent it from falling and being damaged.
• 3. The fan and ventilation holes on the side of the instrument are designed for ventilation and heat dissipation. To ensure the normal operation of the instrument, please do not block them.
• 4. This instrument is a precision electronic instrument. Please be careful to avoid high temperature environments such as direct sunlight when using it outdoors. Pay attention to covering the sun and ventilation to prevent the instrument from overheating or causing a decrease in measurement accuracy.
• 5. As a safety measure, the instrument is equipped with a protective grounding terminal, and the grounding terminal on the side of the device should be reliably grounded before testing.
• 6. The working power supply of the device is 220V (50/60Hz) AC power supply, and a power cord of 10A or above should be selected.
• 7. Do not let any foreign objects fall into the chassis to avoid short circuits.
• 8. During transportation, please lay a sponge or other cushioning protective material outside the instrument to prevent vibration and bumps from damaging the instrument or reducing its accuracy.
• 9. Please do not delete the historical test records saved by the host at will to avoid loss of test data.

Main applicable scenarios

• Power system operation and maintenance: suitable for power plants, substations, power supply companies and other units, used for CT pre operation inspection, operation cycle preventive testing and fault diagnosis, covering 10kV-500kV levels, suitable for common CT types such as indoor, outdoor, oil immersed, dry-type, etc., to ensure the safe and stable operation of the power grid.
• Electrical equipment manufacturing and maintenance: used for factory testing of current transformer manufacturers, enabling efficient batch CT testing to ensure product compliance with design standards; It is also suitable for electrical equipment maintenance units to perform parameter detection and fault location on fault CT, assisting in the completion of maintenance work.
• In the field of scientific research and metrology: suitable for power research institutions and metrology testing departments, it can manually adjust test parameters, open data acquisition interfaces, connect to computers to record detailed test data, and meet scientific research and metrology needs such as CT performance deep analysis and standard calibration.
• Industrial power system: used for electrical systems in large industrial enterprises, conducting regular inspections of CT in the factory to ensure accurate measurement of industrial electricity and reliable relay protection, avoiding production safety hazards and economic losses caused by CT failures.