GM-10kV Megohmmeter: A Technical Overview

For technicians working in high-voltage environments like substations and power plants, accurately measuring insulation resistance is a critical but challenging task. Traditional megohmmeters often fall short in the face of strong electromagnetic interference (EMI) or when testing modern, high-capacity assets like power transformers and long-distance cables. The GM-10kV High Voltage Digital Megohmmeter is engineered specifically to address these field challenges, offering a robust set of features that set a new benchmark for insulation diagnostic equipment.

Key Advantages Over Conventional Instruments

1.Superior Performance in Noisy Environments: Unlike many standard megohmmeters whose readings can be skewed by EMI, the GM-10kV is explicitly designed for stable operation in strong electromagnetic interference environments. This ensures reliable data is collected directly on-site, eliminating doubts about measurement integrity.

2.Unmatched Range and Precision: With a staggering measurement range up to 10 TΩ and multiple output voltage gears from 50V to 10kV, the GM-10kV covers virtually all HV insulation testing scenarios. This is a significant step up from lower-range instruments, which might require multiple devices for different equipment classes. Its basic error of ±(5%·Rx +1d) in the first half of its range provides high accuracy for critical assessments.

3.Advanced Automated Diagnostics: While basic megohmmeters only measure resistance at a single point in time, the GM-10kV automates the entire diagnostic process. It automatically measures and records R15, R60, and R600, and calculates key insulation health indices like the Dielectric Absorption Ratio (DAR) and Polarization Index (PI). This automation not only saves time but also reduces the potential for operator error in manual calculations and timing.

4.Enhanced Safety and Usability: The instrument incorporates critical safety features that are often add-ons or manual procedures with other testers. It features an automatic discharge function post-test, a strong 5mA short-circuit current for clear charging of capacitive loads, and a mandatory safety reminder for grounding. Furthermore, features like the auto power-off reminder and a clear analog/digital dual display enhance both safety and operational efficiency.

Technical Specifications at a Glance

1.Test Voltages: 50V, 100V, 250V, 500V, 1.0kV, 2.5kV, 5.0kV, 10.0kV

2.Measurement Range: 0 ~ 10 TΩ (Auto-ranging)

3.Short Circuit Current: ~5mA

4.Accuracy: ±5% in primary range

5.Data Management: Stores 60 records with 20-year retention; features RS232 interface and a built-in micro-printer.

6.Environmental: Operates at 0℃~+40℃, <85%RH.

Conclusion：

For the technical professional, the GM-10kV represents a significant evolution from basic insulation testers. It is not merely a measurement tool but a comprehensive diagnostic system. Its ability to deliver precise, automated insulation characterization in the toughest EMI conditions, combined with its robust safety features and data management capabilities, makes it an indispensable instrument for ensuring the reliability and safety of high-voltage electrical infrastructure. It effectively solves the persistent problem of field interference, providing confidence in the data that informs critical maintenance decisions.

GDZX is a manufacturer of power detection equipment, offering a diverse range of products with comprehensive models and providing professional technical support. Contact us at +86-27-6552607 or +86-17396104357.Website: http://en.gdzxdl.com/