Which insulator is used in overhead transmission line?
Most commonly used material for overhead line insulators is porcelain. But glass, steatite and some other special composite material may also be used sometimes.
How do you clean electrical insulators?
Use white vinegar to remove water residue and accumulation from years of the insulator weathering on the pole or lying in a field. Pour white vinegar in a deep bowl, and let the insulator soak overnight. Brush its teeth and threads the next morning. Rinse with clear water to remove the vinegar.
How do you clean ceramic insulators?
Place ceramics in various acid baths (located in a fume cupboard).
- Set ceramics in a concentrated nitric/hydrochloric acid mixture in 1:3 volume (“aqua regia” or “Kings water”) for 15 minutes.
- Set ceramics in concentrated sulfuric acid for 15 minutes.
What is insulator washing?
Hot Line Washing is basically a procedure where insulators on electrical lines are cleaned with water while the electricity is energized (on). If the insulators are not cleaned, a flashover may occur causing brownouts, blackouts and damaged equipment.
How much are insulators worth?
Old glass insulators can range in value from $2 up to over $400. Like other antiques, glass insulators are evaluated on several criteria: Age. Rarity.
Is porcelain a conductor of electricity?
Most ceramics resist the flow of electric current, and for this reason ceramic materials such as porcelain have traditionally been made into electric insulators. Some ceramics, however, are excellent conductors of electricity.
How do you clean porcelain insulators?
There are two basic cleaning choices for train smoke, soot, tar, paint and the like: acid or base. Either can be used to effectively clean glass and porcelain insulators. The most popular cleaner is oxalic acid due to its availability, cheapness, safeness and excellent cleaning ability.
What is the main result of insulator failure?
If the surface of porcelain insulator is not properly glazed, moisture can stick over it. This moisture along with deposited dust on the insulator surface, produces a conducting path. As a result the flash over distance of the insulator is reduced.
Which is the best way to clean transmission lines?
The contaminated insulators are susceptible for flashover during humid atmosphere, Drizzling, dew or foggy weather etc. hence need to be cleaned. The contaminated insulators can be cleaned by hot line washing method for lines including 400 Kv level.
What’s the best way to wash an insulator?
Periodic washing of the insulators with high-pressure water. The transmission lines are washed by a large truck carrying water and pumping equipment. Trained personnel wash the insulators by aiming the water spray toward the strings. Substations are equipped with permanent washing systems.
How are transmission lines washed at a substation?
The transmission lines are washed by a large truck carrying water and pumping equipment. Trained personnel wash the insulators by aiming the water spray toward the strings. Substations are equipped with permanent washing systems.
When to use live line insulator washing system?
TERGISOL® – ASCOTECH Live Line Insulator Washing System have been specifically designed to significantly reducer the risk of flashover by efficiently cleaning the polluted insulators when they are still live. The system is proven for use on electricity lines carrying up to 500.000 volts of current.