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- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GD3126 series (GD3126A: 5kV/10TΩ; GD3126B: 10kV/20TΩ) is a portable, microprocessor-controlled high-voltage insulation resistance tester designed for precision insulation diagnostics on HV power equipment. It provides 5–6 selectable test voltages (250V–10kV) with continuous HV adjustment from zero, measures up to 10TΩ/20TΩ, and auto-calculates IR, DAR (absorption ratio), PI (polarization index).
With a large dot-matrix LCD, on-board temp/humidity measurement, 60-group data storage, RS232 communication, and a rechargeable lithium battery, it delivers stable, accurate results in strong EMI environments. Widely used for transformers, motors, generators, HV cables, switchgear, capacitors in substations, power plants, and industrial maintenance.
Specifications
| Parameter | GD3126A | GD3126B |
| Max Test Voltage | 5kV | 10kV |
| Voltage Steps | 250V/500V/1kV/2.5kV/5kV | 250V/500V/1kV/2.5kV/5kV/10kV |
| HV Adjustment | Continuously adjustable 0–5kV | Continuously adjustable 0–10kV |
| Resistance Range | 0–10TΩ | 0–20TΩ |
| Accuracy | ±(5% + 10V) | ±(5% + 10V) |
| ShortCircuit Current | ≥3mA | ≥8mA |
| Voltage Ripple | <3% | <3% |
| Display | Dotmatrix LCD (V/R/I/C/T/RH) | Same |
| Data Storage | 60 groups | 60 groups |
| Communication | RS232 | RS232 |
| Power Supply | 14.8V Liion battery | Same |
| Battery Life | 30 days (10×DAR+5×PI/day) | Same |
| Safety Rating | CAT IV 600V, IEC 610101 | Same |
| Dimensions (mm) | 325×250×130 | Same |
| Weight | ~3.7kg | ~3.7kg |
| Compliance | DL/T 845.1, IEC 610101, CE | Same |
Applications
Core Test Objects
· Power transformers: winding IR, DAR, PI (5kV/10kV)
· HV cables: XLPE/PVC cable insulation, capacitance
· Motors/generators: stator/rotor winding insulation
· Switchgear: bushings, CT/PT, circuit breakers
· Capacitors/reactors: insulation resistance, leakage current
· Substation equipment: secondary circuits, control panels
Typical Usage Scenarios
· Preventive maintenance: scheduled insulation testing
· Commissioning: new equipment insulation verification
· Fault diagnosis: moisture/aging/defect localization
· EMI environments: substations, power plants, industrial sites
· Long-term monitoring: data logging & trend analysis
Advantages
5kV/10kV + 10TΩ/20TΩ Ultra-Wide Range
Covers all common HV assets → one unit for most insulation tests
Continuous HV Adjustment (0 to Max)
Flexible voltage setting → adapt to non-standard test requirements
Full IR/DAR/PI Auto-Calculation
One-button diagnostics → fast, repeatable insulation health grading
Strong EMI Immunity
Stable readings in substations → reliable results in harsh sites
Li-ion + 30-Day Battery Life
Extended field work → less charging, higher productivity
FAQ
Q: What’s the difference between GD3126A and GD3126B?
A: A = 5kV/10TΩ; B = 10kV/20TΩ; B has higher short-circuit current (8mA).
Q: Can it auto-calculate DAR and PI?
A: Yes. Automatically measures R15/R60/R600 and computes DAR=R60/R15, PI=R600/R60.
Q: Does it work in strong electromagnetic fields?
A: Yes. Digital processing provides excellent anti-interference performance for substations.
Q: How long does the battery last?
A: 30 days of typical use (10 DAR + 5 PI tests per day) on one charge.
Q: What’s included in the standard package?
A: Main unit, Li-ion battery, charger, HV test leads, ground cable, carry case, user manual.
