EN
GM-J-10kV Portable Adjustable High Voltage Digital Megohmmeter
GM-J-10kV portable digital megohmmeter is an adjustable high voltage insulation resistance tester for power equipment maintenance. It supports multi-grade test voltage output up to 10kV, accurately measuring insulation resistance, polarization index and dielectric absorption ratio of transformers, cables and HV switchgears.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GM-J-10kV is a high-power, high-precision adjustable digital megohmmeter designed for heavy-duty insulation resistance testing in 500kV substations, power plants, and industrial sites with strong electromagnetic interference. It combines smooth 0–10kV continuous adjustment and 6 fixed voltage gears (0.25/0.5/1/2.5/5/10kV) in one unit, delivering a 10mA typical short-circuit current to handle large-capacitance/inductance loads like large transformers, generators, and high-voltage cables.
With an ultra-wide measurement range of 0.01MΩ–1999GΩ and ±(5%+10V) accuracy, it automatically calculates absorption ratio (R60s/R15s) and polarization index (R10min/R1min) with audible time prompts (15s/60s/10min). Built for harsh environments, it features 2mA (50Hz) electric field interference immunity, -40°C to +50°C operating temperature, and IP54 protection. The compact all-in-one chassis and lightweight design ensure easy portability for field use. Ideal for un-de-energized testing of 500kV transformers, 110–220kV cables, motors, generators, and switchgear.
Specifications
| Parameter | Specification |
| Test Voltage | 0–10kV smooth adjustable；6 fixed gears (0.25/0.5/1/2.5/5/10kV) |
| Voltage Accuracy | ±(5%+10V) |
| ShortCircuit Current | 10mA (typical) |
| Resistance Range | 0.01MΩ–1999GΩ |
| Resistance Accuracy | ±(5%+3d) ~ ±(10%+5d) (varies by range) |
| Timing Function | 15s/60s/10min；audible alarm；auto absorption ratio/polarization index |
| Interference Immunity | 2mA (50Hz) |
| Operating Temperature | 40°C ~ +50°C |
| Storage Temperature | 45°C ~ +55°C |
| Humidity | ≤90%RH (noncondensing) |
| Display | Backlit LCD (voltage/resistance/timing/status) |
| Power Supply | Rechargeable Liion battery (≥8hrs)；AC 100–240V charger |
| Safety Rating | IEC 610101 CAT IV 600V；Double insulation |
| Protection | Overvoltage/overcurrent/shortcircuit/HV discharge |
| Dimensions (mm) | 260×190×85 |
| Weight | 2.8kg (with battery) |
| Compliance | DL/T 845.12004, DL/T 474.12006, JJG 6221997, CE |
Applications
Core Test Objects
· Power transformers: 10kV–500kV insulation resistance, absorption ratio, polarization index
· Power cables: 10kV–220kV XLPE/PVC insulated cables
· Generators/motors: high-voltage winding insulation (6kV–20kV)
· Switchgear: GIS, vacuum breakers, insulators
· Capacitors: high-voltage power capacitor insulation
· Substation equipment: bushings, CT/PT, arresters
Typical Usage Scenarios
· Preventive maintenance: periodic insulation testing for power equipment
· Commissioning: new transformer/cable/generator insulation validation
· Fault diagnosis: insulation degradation, moisture ingress, or damage
· Un-de-energized testing: live substation testing without power outage
· High-altitude/extreme cold: reliable performance up to 5000m and -40°C
Advantages
0–10kV Smooth Adjust + 6 Fixed Gears
One unit for variable and fixed voltage;no need for multiple testers → maximize flexibility & cost savings
10mA High Short-Circuit Current
Drives large capacitive/inductive loads;stable in strong interference → accurate readings for heavyduty equipment
Auto Absorption Ratio & Polarization Index
One-button timing + auto-calculation → save time & reduce human error
2mA Anti-Interference + -40°C~+50°C
Works in 500kV substations & extreme climates → reliable performance anywhere
Lightweight & Portable
2.8kg + compact design → easy transport & field operation
FAQ
Q: Can it test 500kV transformers without de-energizing?
A: Yes. 2mA (50Hz) anti-interference enables live-substation testing.
Q: What’s the maximum cable length it can test?
A: Up to 20km of 110kV XLPE cable;10mA current handles large capacitance.
Q: Does it automatically calculate polarization index?
A: Yes. Times at 1min & 10min, auto-computes R10min/R1min.
Q: Can it work in high altitude or extreme cold?
A: Yes. Operates up to 5000m and -40°C;ideal for mountain/arctic regions.
Q: What’s included in the standard package?
A: Main unit, Li-ion battery, charger, HV test leads (L/E/G), ground cable, shielded probe, carry case, user manual, calibration certificate.
