Power Infrastructure
Composite Insulators
ZTT composite insulators combine a high-strength epoxy resin glass fiber core rod, an advanced silicone rubber housing formula and a labyrinth waterproof end-fitting interface, protected by 100% ultrasonic testing on the core rod. The composite insulator developed by Jiangdong Group is the only insulator in China that has passed the IEC/TR 62730:2012 tracking and erosion test (5000 h multiple stress) at the Hungarian VEIKI-VNL / DEKRA electric large laboratories.
Features & Characteristics
- ▪High-strength epoxy resin glass fiber core rod for mechanical reliability.
- ▪Advanced silicone rubber housing formula with proven hydrophobicity.
- ▪Labyrinth waterproof design at the end-fitting / housing interface.
- ▪Ultrasonic testing of every core rod before assembly.
- ▪Tracking and erosion test (5000 h multiple stress) per IEC/TR 62730:2012 passed at VEIKI-VNL (DEKRA), Hungary — the only Chinese-developed composite insulator to have done so.
Applications
- ▪AC and DC overhead transmission lines from distribution up to UHV (typical ZTT delivery references include 132 kV and 400 kV type-tested designs).
- ▪Substation and switchyard string / post insulation.
- ▪Heavily polluted, coastal, high-altitude and desert environments where hydrophobic silicone rubber is required.
Technical specifications
- Housing material
- HTV silicone rubber (advanced ZTT formula)
- Core rod
- High-strength epoxy resin glass fiber (ECR)
- End fittings
- Forged / cast, hot-dip galvanised steel
- Silicone rubber hardness
- 65 ± 5 Shore A
- Silicone rubber tensile strength
- ≥ 4.0 MPa
- Silicone rubber elongation at break
- ≥ 200%
- Silicone rubber relative density
- 1.5 ± 0.1 g/cm³
- Hydrophobicity
- HC1 – HC2
- Tracking & erosion test
- IEC/TR 62730:2012, 5000 h multiple stress — passed at VEIKI-VNL (DEKRA)
- Type-tested voltage classes (reference)
- 132 kV, 400 kV (CEPRI reports)
- Applicable standards
- IEC 61109-2008, IEC 62217-2012, IEC 60383, IEC 61952-2008, IEC 60060
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