Technical Specifications
| Parameter | Specification |
|---|---|
| Test Medium | 0.1% NaCl solution in deionized water |
| Boiling Duration | 96 hours |
| Tank Size | Custom to insulator length (up to 6m) |
| Temperature Control | PID, maintain boiling state |
| Water Level | Automatic replenishment system |
| Applicable Standards | IEC 61109, IEC 62217 |
Key Features
- Custom-sized boiling tanks for long rod insulators
- Automatic water level maintenance for 96-hour unattended operation
- NaCl concentration monitoring and adjustment
- Integrated cooling system for safe specimen handling post-test
- Multi-tank configuration for batch processing
The 96-Hour Boiling Test
Per IEC 61109, composite insulators must undergo a water immersion pre-stressing procedure before certain electrical tests. The insulator is immersed in boiling 0.1% NaCl solution for 96 hours. This thermal and chemical stress tests the integrity of the housing-to-core-rod interface — any seal failure allows water penetration that will be revealed in subsequent electrical tests.
Seal Integrity — The First Line of Defense
The polymer housing's seal around the FRP core rod is the insulator's primary defense against environmental degradation. If this seal fails, moisture reaches the core rod and can cause brittle fracture failure. The 96-hour boiling test is designed to aggressively stress this seal and detect manufacturing defects before insulators enter service.
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