High-Voltage Diagnostic Tool 12kV – UNI-T UT516B

The UNI-T UT516B represents a critical advancement in high-voltage insulation testing, providing the necessary power and precision to evaluate the health of massive industrial electrical assets. In power generation and heavy industry, identifying minute insulation degradation before it leads to catastrophic failure is essential for grid stability and safety. The UT516B provides six standard voltage ranges ($500\text{V},1000\text{V},2500\text{V},5000\text{V},10000\text{V},12000\text{V}$), with the added ability for fine-tuning in 10% increments to meet specific testing standards.

Comprehensive Insulation Diagnostic Suite

Beyond simple resistance measurements, the UT516B is a complete diagnostic station for high-voltage systems.

• Automatic DAR and PI Calculation: The device automatically calculates and displays Dielectric Absorption Ratio and Polarization Index, providing an immediate health report on the state of motor and transformer insulation without manual calculation.

• Simultaneous Leakage Current Monitoring: The large industrial display shows both the insulation resistance value and the measured leakage current simultaneously, allowing for a deeper understanding of the insulation’s performance under stress.

• High Resistance Capacity: Capable of reading up to 10 Tera-Ohms ($10\text{T}\Omega$), making it suitable for even the highest-grade insulation materials used in modern power grids.

Data Management and PC Integration

The UT516B is designed for modern, data-driven maintenance workflows. It features a large internal memory capable of archiving up to 999 sets of test data. This historical data can be transferred to a PC via the dedicated USB interface, or monitored in real-time using the included analysis software. This allows engineers to track insulation degradation over time (longitudinal tracking) and generate professional compliance reports for safety audits and preventative maintenance programs.

Rugged Industrial Safety and Power Versatility

Built to meet IEC61010-1 and CAT IV 600V safety standards, the UT516B ensures maximum operator protection during high-energy testing. The unit features an auto-discharge function that automatically releases stored energy from capacitive loads (like long cables or large motor windings) after testing is complete, displaying the discharge progress on-screen. For maximum field flexibility, the device supports a dual power supply system, operating on ten standard 1.5V alkaline batteries or a dedicated DC15V power adapter.

Key Features & Technical Advantages:

• Max Test Voltage 12kV: Specialized range for the most demanding high-voltage electrical equipment.

• 10TΩ Resistance Range: High-sensitivity measurement for modern insulation auditing.

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

• 999-Set Data Memory: Large internal storage for efficient site audits without paper logs.

• Real-Time PC Monitoring: USB interface for live data streaming and professional software analysis.

• Safety First Design: CAT IV 600V rated with auto-discharge and high-voltage alarm indication.

Professional Application Scenarios

• High-Voltage Transformer Maintenance: Testing the insulation integrity between primary and secondary windings.

• Large Motor and Generator Auditing: Assessing the polarization index of stator windings in power plants and mines.

• Underground Cable Testing: Measuring the resistance of high-tension cables over long distances to identify moisture ingress.

• Substation Commissioning: Validating new high-voltage infrastructure before it is energized for the first time.

• Railways and Infrastructure: Ensuring the safety of high-voltage traction systems and telecommunications power lines.

Maintenance and Best Practices

To maintain the 12kV accuracy and safety of your UNI-T UT516B, follow these professional protocols:

• Isolation Verification: Before beginning any test, ensure the equipment under test is fully isolated from all power sources and that no “charged bodies” are present.

• Terminal Cleaning: Periodically clean the high-voltage test terminals and leads to prevent surface leakage that could skew high-resistance TΩ readings.

• Battery Replacement: Replace the 10 x LR14 alkaline batteries when the battery icon indicates low voltage to ensure stable output at high-voltage settings.

• Standard Calibration: It is recommended to have the unit professionally calibrated annually to maintain its high-precision diagnostic rating.