PSD-70E 70KN Toughened Glass Insulators

The PSD-70E is a 70 kN suspension-type toughened glass insulator with a double-shed anti-pollution design, commonly used in medium and high-voltage overhead transmission lines.

The PSD-70E glass insulator belongs to thedisc suspension insulator, where multiple units are connected in strings to provide insulation for transmission lines. The designation typically indicates:

• PSD– Anti-pollution (double-shed or fog-type) design

• 70– Mechanical failing load of70 kN

• E– Specific structural version or design variant

Unlike traditional porcelain insulators, toughened glass insulators are made fromthermally tempered glass, which gives them high mechanical strength and excellent dielectric properties.

PSD-70E insulators typically feature70 kN mechanical strength, extended creepage distance, and a double-shed profile for pollution resistance.

The PSD-70E uses a double-shed (anti-fog) design to increase creepage distance and improve performance in polluted environments.

The insulator structure generally consists of three main components:

1. Toughened Glass Disc

The glass disc acts as the primary insulating material. Tempering processes improve itsmechanical strength and impact resistance.

2. Metal Fittings

Forged steel caps and pins are typically galvanized to providecorrosion resistance and strong mechanical connection.

3. Cement Bonding

Special cement connects the metal fittings to the glass body, ensuringstructural integrity and long-term durability.

The double-shed configurationallows contaminants to be washed away more easily by rain, helping maintain insulation performance.

PSD-70E insulators are widely used inoverhead power transmission lines, polluted environments, and coastal power grids.

Typical applications include:

• High-voltage overhead transmission lines

• Distribution networks

• Industrial areas with heavy pollution

• Coastal or salt-fog environments

• Regions with dust or chemical contamination

The anti-pollution design ensures stable operation in environments where standard disc insulators may experience flashover.

PSD-70E glass insulators requireminimal maintenance and can operate reliably for decades.

Glass suspension insulators generally offer a service life of 30–50 years or morewhen installed properly. Routine maintenance typically involves:

• Visual inspection of insulator strings

• Checking for mechanical damage

• Monitoring contamination levels

The self-cleaning property of glass reduces the need for frequent washing, which helps lower maintenance costs for utilities.

1.What does PSD-70E mean in insulator terminology?

PSD-70E refers to adouble-shed anti-pollution glass suspension insulator with a 70 kN mechanical rating.

2.What voltage levels use PSD-70E insulators?

They are commonly used inmedium and high-voltage transmission systems, often from35 kV to 220 kV or higher depending on string configuration.

3.Why choose glass insulators instead of porcelain?

Glass insulators providehigher transparency for inspection, better self-cleaning ability, and consistent dielectric performance.

4.Are PSD-70E insulators suitable for coastal environments?

Yes. The extended creepage distance and double-shed designmake them suitable forsalt fog and heavy pollution conditions.