High voltage insulator failures precautions

Composite Insulators are made of silicone rubber compound high voltage insulator. The main products are a bar and a cross arm on 35kV, 110kV and 220kV lines as draping and Strain bearing insulation. Currently, there are insulators for 10kV lines.

Composite insulators approximate shape structure suspension insulator, there ends fittings, insulation umbrella corrugated sleeve jacket and must constitute a mandrel.

It has the following advantages:

(1) the superior mechanical properties: Because the rod is made of epoxy glass fiber, which is 1.5 times the normal expansion of the strength of steel, is 3 to 4 times of high strength porcelain, axial tension is particularly strong, and has a strong vibration absorption capability, Seismic high damping properties, porcelain insulators 1/7 to 1/10.

Good (2) anti-fouling flash performance: composite insulator is hydrophobic, the umbrella corrugated surface of the composite insulator film formed does not wet when it rains, it was like drops of water dripping, easy to constitute a conductive channel, its pollution Lightning higher pressure, for the same voltage level porcelain insulator 3 times.

(3) electrolytic corrosion resistance is excellent: the formation of the insulator surface flashover leakage irreversible deterioration of tracking the phenomenon, the general standard of not less than 4.5 (ie 4.5kV), and composite insulators 6 to 7.

(4) Anti-aging performance: After decades of practice test showed that, in addition to composite insulators slightly darker color and a slight increase in the dielectric constant and dielectric loss angle, but on the surface is not wet electrolytic corrosion resistance and tracking of no change, indicating good anti-aging properties.

(5) Structural stability: general porcelain suspension insulator assembly within the plastic structure is due to galvanic corrosion, the operation will produce a low insulation resistance value of zero, and an outer plastic composite insulator assembly structure, its heart is a solid rod of insulating material, there is no deterioration of the closing breakdown, the insulator does not appear zero value.

High (6) Line operating efficiency: Since the composite insulators storm self-cleaning, without producing zero value insulator, so cleaning and inspection work can be changed every four to five years, thereby reducing maintenance, outage time.

(7) Light weight: with a lightweight insulator itself in the transport, construction work, you can greatly reduce the labor intensity of staff.

But things are divided into two composite insulators, there are some disadvantages:

(1) composite insulators high prices.

(2) composite insulators withstand radial (perpendicular to the center line) stress is very small, so Tension rod for use in non-Insulators stampede, or any form of radial load, otherwise it will lead to breakage.

(3) composite insulators in construction or usually runs non-drop hard objects, grazing, because the umbrella of silicone rubber, texture is soft, easy to damage and destroy the seal, resulting in insulation performance.