• ① Less leakage current generation

  The deep-grooved, double-layered structure of the insulator prevents staining and wetting of the inner part of the insulator, resulting in less leakage current. Its deep-groove, double-layered structure produces a minimal potential gradient, which helps reduce leakage current.
  The insulator maintains its insulating capability against sudden environmental changes (rapid staining) such as typhoons.

• ② Minimal drop in insulation resistance

  Because the creepage distance of insulation is long, the surface insulation resistance is high even if it gets wet, and little decrease in insulation resistance. Unlike the multi-fold type, there is no need to use a large insulator with a working voltage one rank higher.

• ③ Excellent high salt resistance and dust resistance

  Because ceramics have a self-cleaning power, they are hard to get dirty. And because of the long creepage distance, our double-grooved insulators are highly resistant to salt damage and dust. Please check the test results below.

• ④ Reduced maintenance and inspection costs

  Due to the features of our insulators, the cost of maintenance and management of the device is reduced because the ceramic part of the insulator does not need to be cleaned to restore insulation performance. Normally, the metal fittings deteriorate, but the ceramic part does not. It has a longer life than resin insulators.

Examples of measurement of leakage current by artificial contamination tests.

* The formula of the solution for the test is:
An aqueous solution containing 3% salt (salt concentration of seawater) and 4% dust (used to make salt adhere to the insulator surface)
The amount of spray is 1mm/cm² per minute (equivalent to the amount of rainfall during a typhoon).

We will select a double-grooved insulator suitable for your crane equipment and design a structure and dimensions that can be installed.

• 
  Upward insulators
• 
  Downward insulators
• 
  Horizontal L-shaped insulators
  (with flange)
• 
  Upward L-shaped insulators
  (with flange)

Ceramics has the characteristic of being weak against pulling force and strong against compressing force.
In addition, our cap is hot-dip galvanized and has excellent strength and corrosion resistance.
Therefore, the metal fitting for supporting the trolley is cap type that it can be used for a long time even in a special environment (temperature fluctuation, corrosive gas, dirt is generated).

Structure that takes advantage of the strong features of compression