Significance of the GM-5kV Adjustable High Voltage Digital Megohmmeter

The GM-5kV Adjustable High-Voltage Digital Megohmmeter, developed by Guodian Zhongxing, is a cutting-edge instrument designed for precision insulation resistance testing in high-voltage power systems. Tailored for challenging environments such as substations, power plants, and remote cable networks, this device ensures reliable performance under strong electromagnetic interference (EMI) and high-voltage leakage conditions. Its advanced features and robust design make it indispensable for evaluating the insulation integrity of transformers, motors, generators, and long-distance power cables.

Key Performance Features

Intelligent Control & User Interface

Microprocessor-controlled operation with menu-driven navigation.

Large LCD dot-matrix display for real-time data visualization.

Combined analog bar graph and digital readout for dynamic trend analysis.

High-Voltage Output Flexibility

Seven preset voltage levels: 50V, 100V, 250V, 500V, 1.0kV, 2.5kV, and 5.0kV.

Continuously adjustable output from 0V to 5kV for customized testing requirements.

Advanced Measurement Capabilities

Insulation Resistance (IR): Measures 0–10 TΩ with auto-ranging.

Time-Stamped Metrics: Automatically calculates R15, R60, R600, absorption ratio (DAR), and polarization index (PI).

Multi-Parameter Detection: Simultaneously displays leakage current (0.1nA–9.9mA) and absorption capacitance (0.1pF–99μF).

Enhanced Safety & Reliability

Pre-test live circuit detection with voltage alerts.

Auto-discharge function (<30s post-test) and mandatory safety grounding.

Withstands 10kV AC withstand voltage (test lead-to-chassis).

Data Management & Connectivity

Stores 60 test records with 20-year non-volatile retention.

RS232 interface for PC communication and optional built-in micro-printer.

Environmental Adaptability

Integrated temperature (-0.5℃ accuracy) and humidity (±2% RH accuracy) sensors.

Operates in 0–40℃/85% RH conditions; ruggedized for storage at -20–50℃/90% RH.

Power Efficiency

14.8V lithium battery supports 30 days of operation (10 DAR + 5 PI tests daily).

Auto-shutdown after 5 minutes of inactivity.

Technical Specifications

Applications in Power Systems

High-Voltage Equipment: Diagnose insulation degradation in transformers, generators, and switchgear.

Long-Distance Cables: Assess insulation quality of underground or overhead cables.

Preventive Maintenance: Track polarization index trends to predict insulation aging.

Field Testing: Ideal for EMI-heavy environments due to anti-interference design.

Operational Advantages

Time-Saving Automation: Programmable test duration (up to 600s) with 15s audible prompts.

Safety Compliance: Meets IEC 61010 standards for high-voltage insulation testers.

User-Centric Design: Ergonomic interface, lightweight construction, and IP-rated casing.

Conclusion

The GM-5kV Digital Megohmmeter sets a benchmark for insulation resistance testing in high-risk electrical environments. Its fusion of precision, safety, and adaptability empowers technicians to perform critical diagnostics efficiently while adhering to stringent operational standards. By integrating advanced measurement algorithms, robust data logging, and user-centric features, this instrument is a vital tool for ensuring the reliability and longevity of power infrastructure.

GDZX is a manufacturer of power testing equipment, offering a wide range of product categories with comprehensive models and providing professional technical support. Contact: +86-17396104357. Website:https://www.highvoltage-testequipment.com/