Field measuring instrument UHV-3000

resistanceelectricindustrial

Overview
The UHV-3000 is a field tester for on-load tap-changers of power transformers. It measures transition waveform, transition time, transient (transition) resistance and checks three-phase synchronization. The unit features dual current outputs, integrated protection circuitry, automatic calculation functions, a 5.7" LCD and USB data storage for on-site diagnostics.

Application
Intended for commissioning, routine maintenance and fault diagnosis of transformer on-load tap-changers in substations and industrial facilities. Suitable for single-phase and three-phase verification and waveform analysis.

Technical parameters
Output current: 1.0 A, 0.5 A
Transition resistance measurement range: 0.5 Ω–20 Ω (at 1.0 A); 0.5 Ω–40 Ω (at 0.5 A)
Transition time range: 0–250 ms
Transition resistance accuracy: ±(5% reading + 3 digits)
Transition time accuracy: ±(0.1% reading + 3 digits)
Operating temperature: -10℃–50℃
Relative humidity: ≤85% RH
Power supply: AC 220 V ±10%, 50 ±1 Hz
Data storage: USB flash (U-disk) and local storage
Dimensions: 345 × 295 × 175 mm
Weight: 5 kg

Features

• Dual current outputs (1.0 A / 0.5 A) to extend measurement range.
• Automatic calculation of transition resistance and transition time.
• Comprehensive protection circuit for safe field operation.
• 5.7" LCD for direct viewing of waveforms and parameters on site.
• USB flash drive storage for waveform and log export.
• Independent keypad control and one-key flying-shuttle for faster operation.
• Portable, lightweight design for on-site use.

Specifications

• Model: UHV-3000
• Output current: 1.0 A, 0.5 A
• Transition resistance: 0.5 Ω–20 Ω (1.0 A); 0.5 Ω–40 Ω (0.5 A)
• Transition time: 0–250 ms
• Accuracy: see technical parameters
• Operating conditions: -10℃–50℃; ≤85% RH
• Power: AC 220 V ±10%, 50 ±1 Hz
• Storage: USB and local
• Dimensions: 345 × 295 × 175 mm
• Weight: 5 kg

Advantage

• Comprehensive functionality: This tester can measure parameters such as transition time, transition waveform, transition resistance, and three-phase synchronicity of on load tap changers, providing users with comprehensive switch performance analysis.
• Easy to operate: The instrument adopts a large screen dot matrix LCD display and a graded Chinese menu, which is intuitive and easy to operate. Users only need to press the function keys according to the prompts to perform measurements.
• High degree of intelligence: The instrument has intelligent testing and result analysis functions, which can automatically identify faults in the waveform and mark them, making it convenient for users to further analyze and compare the waveform.
• Strong anti-interference ability: The all aluminum alloy chassis and instrument are equipped with power noise filters and anti-interference circuits, which can reliably measure in sites with poor power quality and strong electromagnetic field interference.
• Data storage and printing function: The instrument is equipped with an uninterruptible power storage device, which can store multiple sets of waveforms and data, and archive, retrieve, and analyze them at any time. At the same time, the instrument is equipped with a printer that can directly print test results.

Main application scenarios:

• 1. Factory acceptance: In the transformer manufacturing process, the assembled on load tap changer is subjected to factory testing to ensure that its mechanical characteristics and electrical performance meet the design standards.
• 2. Installation and commissioning: Before putting the new transformer into operation, conduct on-site testing to verify whether the tap changer is intact after transportation and installation, and whether the action logic is correct.
• 3. Preventive testing: As a core project of regular maintenance of power equipment, it timely detects latent faults such as switch contact wear, mechanism jamming, and timing abnormalities through testing.
• 4. Fault diagnosis and maintenance: When the tap changer refuses to operate, malfunctions or the transformer chromatographic analysis is abnormal, the instrument can quickly locate the fault point, guide maintenance, and shorten the power outage time.