Production Introduction
Polymer Electrical Insulators
| Rated Voltage | Height | Dry Arcing Distance | Creepage Distance | Specified Cantilever Load (SCL) |
Rod | No. od sheds | Wet Power Frequency Withstand Voltage (kV) |
Lightning Impulse Withstand Voltage (kV) |
| 126kV | 1220±2.7mm | 1084mm | 3150mm | 20kN | 50mm | - | - | 450 |
Parameters
| Item | Requirement | Measured Valued |
| Visual examination | Fuchsine, grey or white, no obvious mechanical admixture. Vulcanized silicon rubber with dense and smooth cutting surface. | Ok |
| Hardness (shore A) | ≮50 | 65~70 |
| Tensile strength (Map) | ≮4 | 4~6 |
| Failure elongation (%) | ≮150 | ≮180 |
| Tearing strength (kN/m) | ≮10 (right angle sample) | 12~15 |
| Volume resistivity (Ω.m) | 1X1012 | 3~8X1012 |
| Puncture strength (kV/mm) | Alternating current ≮22 | ≮30 |
| Tracking and erosion | TMA4.5,erosion depth≯2.5mm | TMA4.5, erosion depth <0.8mm |
| Flammability (Grade) | FV-0 | FV-0 |
Polymer Electrical Insulators
Composite post insulators
In contrast to composite long rods, composite post insulators are subjected mainly to loads which act perpendicular to the longitudinal axis of the insulator and thus produce bending stresses over the cross-section of the insulator. As a result of this bending load, composite post insulators use FRP rods of substantially greater diameter compared to composite long rods. Typical applications of composite post insulators include distribution insulators, vertical and horizontal line posts, busbar support insulators and railway catenary insulators.
Composite long rod insulators
Composite long rod insulators are primarily used in suspension strings in straight-line supports and as tension strings in anchor towers and dead-end towers. They are also used in the jumpers or portals of outdoor substations. In some cases, composite long rods are used in the guys of wooden poles, and more rarely in the guys of steel towers.
Interphase spacers
Line compaction is primarily based on the principle of minimising interphase spacing. As a result of this, and also since the interphase spacings are somewhat smaller than those encountered in the case of normal overhead transmission lines, there is greater risk of interphase flashover with a compact design when two conductors are moved close to one another, for example as a result of wind, ice shedding or short circuit; this may lead to an interruption in service. Interphase spacers (IPS) are used to avoid this.
Advantage
| Item | Composite Insulators |
| Hydrophobicity | The hydrophobic property of silicone rubber offers excellent insulation and resistance to wetting, forming water beads without requiring washing or greasing, even in humid or polluted climates. |
| Contamination & Pollution Performance | Excellent |
| Maintenance | It can significantly reduce the operational maintenance costs of the line, power outage losses, and manual labor intensity. |
| Size and Weight | Small in size and lightweight (approximately 1/7 to 1/10 the size of equivalent porcelain insulator strings), the umbrella skirt exhibits excellent elasticity, is resistant to breakage, facilitates easy transportation and installation, and is cost-effective. |
| Mechanical Load | The fiberglass core rod has high tensile strength, which is 5 to 10 times that of ceramic materials. Due to the small cross-section of the core rod, the product has small dimensions and lightweight, high bending strength, and is easy to manufacture large tonnage products exceeding 300kN. |
| Delivery time | The manufacturing process is simple, and the delivery time is short. |
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