Technical Specifications
| Parameter | Specification |
|---|---|
| Test Method | Boiling in NaCl solution + voltage withstand |
| Boiling Duration | 100 hours (per IEC 62217) |
| Applied Voltage | 12 kV AC |
| Measurement | Leakage current during voltage application |
| Tank Capacity | Up to 20 specimens simultaneously |
| Applicable Standards | IEC 61109, IEC 62217, GB/T 19519 |
Key Features
- Integrated boiling tank with NaCl solution temperature control
- Automatic 100-hour timer with unattended operation
- High-sensitivity leakage current measurement (microamp resolution)
- Multi-specimen holder for batch testing efficiency
- Pass/fail criteria automatically evaluated per standard threshold
Water Diffusion — A Critical Composite Insulator Test
The water diffusion test evaluates the FRP core rod's resistance to moisture penetration — one of the most important durability tests for composite insulators. Per IEC 62217, the core rod is boiled in deionized water with 0.1% NaCl for 100 hours, then subjected to a 12kV voltage withstand test while monitoring leakage current. Excessive leakage indicates moisture has penetrated the rod, compromising long-term performance.
Why This Test Matters
Moisture ingress into the FRP core rod is a primary failure mechanism for composite insulators. Water can travel along the glass fiber-resin interface through capillary action, causing electrical degradation and eventual brittle fracture. This test verifies that the core rod manufacturing process achieves sufficient fiber-resin bonding to prevent water migration.
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