Silicone Polymer Suspension Insulator
- Weathersheds:
- These Insulators are manufactured with silicone rubber with proprietary compound, the same proven material used in transmission insulators.
Insulators are available with other ANSI and IEC end fittings. Please refer to the catalog for the configurable options available.
One example of many models
General
| Application | Suspension |
| Fitting – Ground/Base | Socket |
| Fitting – Live Line End | Ball |
| Material | ESP |
| Material – End Fitting | Socket – Duct. Iron / Ball – Steel |
| Material – Pin (Cotter) | Stainless Steel |
| Number of Sheds | 12 |
| Shed Style | Uniform |
| Strength Rating – Ultimate | 15000 lb |
| Tensile Strength | 70 kN |
| Tensile Strength – Routine | 7500 |
Dimensions
| Diameter – Shed(s) | 150 mm |
| Length – Effective | 876 mm |
| Rod Diameter | 0.625 |
| Thickness – Housing | 0.150 |
| Weight | 3.17 kg |
Electrical Ratings
| Arc Distance – Dry | 889 mm |
| Creep and Leakage Distance | 2133 mm |
| Critical Impulse Flashover (CIFO) – Negative | 580 |
| Critical Impulse Flashover (CIFO) – Positive | 610 |
| Flashover Voltage – 60 Hz Dry | 370 |
| Flashover Voltage – 60 Hz Wet | 305 |
| Voltage – Line | 69000 V |
Certifications and Compliance
| Industry Standard(s) | IEC |
Logistics
| Pallet Quantity | 150 |
| Standard Package | 12 |
The suspension insulator separates the line conductors and carries them electrically. It consists of the number of porcelain insulation units connected by metal links to form a flexible cord. The conductor is connected to the lower end of the string.
Advantages of the suspension isolator
The suspension isolator has the following advantages.
Each unit operates at a voltage of approximately 11 kV and therefore, depending on the voltage, the corresponding number of disks is connected in series with the chain.
If one of the units is damaged, it is replaced with the new one, so that the entire string does not have to be replaced.
The string can swing freely in any direction and therefore offers great flexibility for the transmission line.
The conductors are located under the suspension insulators and therefore partially protect the conductor from lightning.
Types of suspension isolators
The suspension isolator is mainly divided into two types.
Cap and pen type
Hewlett or Interlink type
The detailed explanation of the cap and pin, as well as the Hewlett insulator, is explained below.
1.Cap-and-pin isolator
A galvanized cast iron or forged steel cap and a galvanized forged steel pin are connected to porcelain in the cap and pin construction. The unit is connected by either ball joint or clevis pin connections.
2. Interlink Type Insulator
The connection type unit uses porcelain with two curved channels with planes at right angles to each other. U-shaped, flat, covered steel links led through these channels and served to connect the unit.
The interlink isolators are mechanically stronger than the cad and pin unit. The metallic link continues to support the line when the porcelain breaks between the link. This means that the supply is not interrupted.
The only disadvantage of the Hewlett-type insulator is that it suffers from the disadvantages that the porcelain between the members is subjected to high electrical stresses and therefore its breakdown voltage is lower compared to other types.