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Characteristics of Network Isolators - DUNIA PEMBANGKIT LISTRIK

Characteristics of Network Isolators - DUNIA PEMBANGKIT LISTRIK
Characteristics of Isolators, as follows:
- Has high mechanical strength so that it can withstand the burden of conducting wire
- Has a high dielectric constant, so that it can provide high dielectric strength
- Has a high insulation resistance so that no leakage current to the ground
- Has a high ratio between breaking strength and fire stress
- Do not use porous materials and are not easily affected by temperature changes
- Dirt free from the outside and not easily cracked or scratched
- Has dielectric strength and mechanical strength
- Material that is able to withstand stress
- Not heavy


Electrical Characteristics

The insulator has 2 electrodes which are made of metal for the lid and the pins are separated by insulating material. Each insulation material has the ability to withstand stresses, often referred to as dielectric strength.

The isolator will not be ideal if there is a voltage between the two isolator electrodes which are experiencing a voltage jump.

In an electric power system, the voltage of a fire step is often called overvoltage which arises from two sources. The first source comes from the system itself which is a short circuit (short circuit) and the second source comes from outside the system which is often called a lightning strike disturbance.
The fire jump voltage in an insulator consists of a low-frequency fire jump voltage, an implant, and is translucent in oil.

Dry low-frequency fire jump voltage is the voltage that occurs when a voltage is applied between 2 clean and dry insulator electrodes on its surface, the constant value, and the basic value of the insulator characteristics. While the wet fire jump voltage is the voltage that occurs when a voltage is applied between the voltage of 2 insulator electrodes that are wet due to rain or in a wet state.

Implanted flame jump voltage is the voltage that occurs when the implant voltage with a standing wave is applied. Implant characteristics are divided into 2 parts namely positive polarity (+) and negative polarity (-).

Low-frequency breakdown voltage indicates the dielectric strength of the insulator and occurs when a low-frequency voltage occurs at 2 electrodes dipped in oil until the insulator breaks.


Mechanical Characteristics

The insulator must also have the mechanical strength to assume the mechanical load of the isolating conductor. Porcelain is the main part of an insulator which has properties as cast iron, with greater pressure and less tensile strength. The tensile strength is between 400-900 kg / cm2 and the pressure strength is 10 x greater.

Porcelain must be porous and not cracked and must be resistant to sudden changes in temperature.
The mechanical strength of a hanging and long insulator must be tested beforehand to find out its mechanical and uniform ability. The strength is determined by the strength of the pin against the bending moment by the conductor.

In the planning of air transmission lines (STU), over-voltage on the insulator is the most important factor.


Dirt On Isolators

In general, the source of pollution in insulators is divided into 2 parts, namely as follows:
- Pollution from the sea
- Industrial pollution
- Pollution from the regions
- Pollution from volcanoes


Impact of Dirt on Isolators

In general, pollutants or pollution do not have a positive impact on the performance of the insulator, but the pollutants have negative effects as follows:
- Current leakage occurred
- Sparks jump
- Degradation of isolator surface
- Energy losses occur
- Speed ​​up insulator failure
- Can affect the amount of isolator resistance

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