Refine On (Hebei) Electric Power Technology Co., Ltd. is one of the leading manufacturers and suppliers of insulation and resistance tester in China. If you're going to wholesale durable insulation and resistance tester, welcome to get quotation from our factory. All customized products are with high quality and competitive price.
Insulation and Resistance Tester features a large backlit LCD that displays resistance, test voltage, leakage current, and test duration simultaneously. The instrument automatically calculates PI and DAR. Insulation and Resistance Tester includes a built‑in rechargeable battery (AC220V charging) and a protective case for field use. The insulation and Resistance Tester has a safety interlock that prevents live‑line testing. Operating temperature: 0°C to 40°C, humidity <90% RH, altitude <3000 m.
Product Parameters
|
Parameter |
Value / Specification |
|
Model |
NRG2705 (10 kV version) |
|
Test voltages |
500 V, 1000 V, 2500 V, 5000 V, 10000 V |
|
Resistance range |
0.01 MΩ – 20 TΩ |
|
Accuracy |
±5% reading (0.1 MΩ – 1 TΩ); ±20% (1 TΩ – 20 TΩ) |
|
Resolution |
0.01 MΩ (low range) to 0.1 GΩ (high range) |
|
Short‑circuit current |
≥5 mA |
|
PI / DAR calculation |
Automatic (up to 30 minutes) |
|
Leakage current range |
0.001 µA – 5 mA |
|
Display |
LCD with backlight, 5‑digit |
|
Data storage |
100 records |
|
Power supply |
Rechargeable Li‑ion battery (AC220V charger) |
|
Battery life |
~8 hours continuous test at 10 kV |
|
Dimensions (W×D×H) |
480 × 405 × 230 mm |
|
Gross weight |
7 kg |
|
Operating temperature |
0°C – 40°C |
|
Operating humidity |
<90% RH |
Key Advantages
- Wide resistance range: Up to 20 TΩ, suitable for large power equipment.
- Automatic PI/DAR: Instant assessment of insulation quality without manual calculation.
- High short‑circuit current (≥5 mA): Charges capacitive loads quickly for stable readings.
- Safety features: Live‑line detection, automatic discharge of capacitive charge after test.
- Rechargeable battery: No need to replace batteries in the field.
Applications
- Insulation resistance testing of power transformers (winding‑to‑ground and inter‑winding)
- Cable insulation testing for medium‑voltage distribution networks
- Motor and generator insulation condition assessment
- Switchgear and busbar insulation testing in substations
- Predictive maintenance in industrial plants
Related Products
Factory Show
FAQ
Q1: What is the maximum capacitance load the NRG2705 can handle?
A: The tester can charge capacitive loads up to 10 µF at 10 kV without damage. Charge time depends on the capacitance.
Q2: How is the polarization index (PI) calculated?
A: PI = 10‑minute insulation resistance ÷ 1‑minute insulation resistance. The tester automatically performs this calculation and displays the result.
Q3: Does the instrument discharge the device under test after completion?
A: Yes, an automatic discharge circuit safely discharges any capacitive charge to below 50 V within 10 seconds.
Q4: Can it measure at lower voltages (e.g., 500 V)?
A: Yes, you can select 500 V, 1000 V, 2500 V, 5000 V, or 10000 V manually.
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