Substation

Insulator

 
 
 

Introduction

Porcelain insulators are used for supplying electricity. The lines of high voltage Overhead transmission or distribution lines systems are usually composed of wires mainly of copper, all aluminum conductors both bare and cover conductor cable, which are suspended from tall lattice work towers of steel by strings of porcelain insulators. There are the super high tension and high tension insulators used for transmitting electricity along a transmission line from the power station to the substation. There are the high, middle, and low-tension insulators used for transmitting electricity from a substation to the consumers.


Their proper function depends on the insulation system with the supporting structures largely. The performance of outdoor insulators, as main insulating material, is influenced by some parameters. Two of these parameters are environmental pollution and humidity. Those lines sometimes traverse on many polluted or emitted areas, such as coastal, industrial areas, transmission lines are used to transmit electric energy from a power plant to a substation and to distribution line at the end.


An insulator, also called a dielectric, is a material that resists the flow of electric current. An insulating material has atoms with tightly bonded valence electrons. These materials are used in parts of electrical equipment, also called insulators or insulation, intended to support or separate electrical conductors without passing current through themselves. Most high voltage insulators are designed with a lower flashover voltage than puncture voltage, so they will flashover before they puncture, to avoid damage.


Dirt, pollution, salt, and particularly water on the surface of a high voltage insulator can create a conductive path across it, causing leakage currents and flashovers. To accomplish this, the surface is molded into a series of corrugations or concentric disk shapes. These usually include one or more sheds; downward facing cup-shaped surfaces that act as umbrellas to ensure that the part of the surface leakage path under the 'cup' stays dry in wet weather. Minimum creepage distances are 20–25 mm/kV, but must be increased in high pollution or airborne sea-salt areas.


Our products shall cover a wide range of insulators required by the customers such as Pin type, Pin Post type, post type, suspension type, bus bar support insulator, strain type and spool type, etc.

Features

The equipment shall have successfully passed all the type tests or design tests in accordance with the Thai Industry Standards and the following international standards:

  • ANSI Publication C29.1-1982: Tests Methods for Electrical Power Insulator.
  • ANSI Publication C29.2-1992: Wet-process Porcelain and Toughened Glass Insulators (Suspension Type).
  • ANSI Publication C29.3-1980: Wet-process Porcelain Insulators (Spool Type)
  • ANSI Publication C29.4-1977: Wet-process Porcelain Insulators (Strain Type)
  • ANSI Publication C29.6-1984: Wet-process Porcelain Insulators (High-voltage Pin Type)
  • ANSI Publication C29.7-1983: Wet-process Porcelain Insulators (High-voltage Line-post Type).
  • ANSI Publication C29.8-1985: Wet-process Porcelain Insulators (Apparatus, Cap and Pin Type).
  • ANSI Publication C29.9-1971: Wet-process Porcelain Insulators (Apparatus, Post Type).
  • NEMA Publication HV 1-1978 : High-voltage Insulators
  • ASTM Designation A 153-73 : Standard Specification for Zinc Coating (Hot-dip) on Iron and Steel Hardware.
  • IEC Publication 575-1977 : Thermal-mechanical Performance Test and Mechanical Performance Test on String Insulator Units
  • TISI. Publication No. 227-2525: Standard for Spool-type Porcelain Insulators.
  • TISI. Publication No. 279-2525: Standard for Pin-type Porcelain Insulators.
  • TISI. Publication No. 280-2529: Standard for Strain-type Porcelain Insulators.
  • TISI. Publication No. 354-2528: Standard for Suspension-type Porcelain Insulators.
  • TISI. Publication No. 1251-2537: Pin-Post Type Porcelain Insulators.

All the products shall be completely passed the routine test before delivery to the local and oversea customers.

Type

  • Busbar Insulator
  • High Voltage Insulator (Line Post Insulator, Pin Insulator, Pin Post Insulator, Station Post Insulator, Suspension Insulator)
  • Low Voltage Insulator (Strain Insulator, Spool)

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The equipment shall have successfully passed all the type tests or design tests in accordance with the Thai Industry Standards and the following international standards:

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