High-Voltage Diagnostic Meter 5kV – UNI-T UT513A

High-Voltage Precision for Industrial Power

The UNI-T UT513A represents a critical component in any preventative maintenance program for high-voltage infrastructure. In industrial plants and power utilities, the integrity of insulation is the first line of defense against catastrophic system failure. The UT513A provides a stable, high-energy output that allows technicians to penetrate the capacitive reactance of large-scale equipment, delivering precise resistance data that standard multimeters simply cannot capture.

Advanced Insulation Diagnostic Suite

The UT513A goes beyond simple resistance measurements to provide a multi-dimensional view of insulation quality:

• Selectable Test Voltages: Offers four fixed voltage ranges—500V, 1000V, 2500V, and 5000V—allowing for tailored testing according to the specific rating of the equipment under audit.

• Automated PI and DAR: The meter automatically performs the timed ratio tests required for Polarization Index (10 min/1 min) and Dielectric Absorption Ratio (60s/30s), presenting the final calculation on the display to identify aging or contaminated insulation.

• Large Logarithmic Display: Featuring a high-contrast LCD with a 9999-count resolution and an analog bar graph, it allows technicians to visualize the stabilization of resistance over time, which is vital for assessing the absorption characteristics of the material.

Industrial Safety and Data Connectivity

Safety is paramount when working with 5000V output. The UT513A is built with an automatic discharge function that safely releases any stored energy from the circuit under test once the measurement is complete.

• Real-Time USB Interface: The unit includes a dedicated USB port for PC communication. Using the included software, engineers can stream measurement data in real-time, allowing for the creation of professional “charging curve” graphs and long-term diagnostic reports.

• Internal Data Logging: The device can store up to 18 groups of measurements in its internal memory, making it easy to perform multiple site audits before returning to the office for data analysis.

• Overload and High-Voltage Warnings: Visual and audible alerts notify the operator when high voltage is present at the terminals, ensuring a safe working environment at all times.

Ruggedized Field Build

Housed in a heavy-duty, impact-resistant carrying case, the UT513A is designed to survive the vibration and dust of a professional work truck. The unit can be powered by standard batteries for ultimate portability or via a power adapter for extended bench-top testing. With its massive jaw-style high-voltage clips and shielded test leads, it provides the secure connections required for high-energy electrical environments.

Key Features & Technical Advantages:

• 5000V Maximum Output: High-voltage capacity for professional industrial and utility-grade testing.

• 1000GΩ Resistance Range: Capable of measuring even the highest-grade insulation materials.

• DAR and PI Calculations: Automated diagnostic ratios for rapid insulation health assessment.

• USB PC Connectivity: Seamless data export and real-time monitoring for professional reporting.

• Auto-Discharge Safety: Automatically clears remaining voltage from the circuit post-test.

• Safety Rated (CAT III 600V): Robust protection for work on primary power distribution systems.

Professional Application Scenarios

• Transformer Core Testing: Verifying the insulation between windings and the ground frame in distribution transformers.

• High-Voltage Motor Maintenance: Periodic PI testing of stator windings to identify moisture or thermal degradation.

• Underground Cable Auditing: Testing the insulation jacket of high-tension cables for leaks or physical damage.

• Substation Commissioning: Ensuring all new switchgear and busbars meet insulation standards before being energized.

• Renewable Energy Plants: Auditing the electrical integrity of wind turbine generators and solar farm inverters.

Maintenance and Best Practices

To maintain the 5kV accuracy and safety of your UNI-T UT513A, follow these protocols:

• Shielded Lead Usage: Always use the provided shielded test leads to prevent electromagnetic interference from skewing high-resistance GΩ readings.

• Environmental Considerations: High humidity can create surface leakage paths; always perform a “Guard” terminal connection when testing in damp environments to bypass surface current.

• Battery Replacement: Replace the 8 x 1.5V (LR14) batteries promptly to ensure the internal DC-to-DC converter can maintain the full 5000V output under load.

• Lead Inspection: Before every test, visually inspect the high-voltage clips and leads for any signs of cracking or arcing paths that could compromise safety.