Ageing insulating material Experiment


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Ageing insulating material Experiment

  1. 1. 2010 SPARK-KING Knowledge is NO-WHERE ….. (Engineering Lectures and Engineering Solutions) 09833066325 / 08796149007 VIJAY BALU RASKAR BE-Electrical / MBA - Operation [Engineering Assignments]
  2. 2. SPARK-KING ….. Unique solution for Learning. VBR Experiment No: Title: Observe development of tracks due to ageing on different Insulating Materials Roll No: Batch: Date: ___________________________________________________ DESIGNED BY, PROF. VIJAY BALU RASKAR
  3. 3. SPARK-KING ….. Unique solution for Learning. VBR EXPERIMENT NO: OBSERVE DEVELOPMENT OF TRACKS DUE TO AGEING ON DIFFERENT INSULATING MATERIALS TITLE: Study of insulating materials like mica, Bakelite, etc AIM: To study different types and properties of insulating materials with observation development of tracks due to ageing on different insulating materials. THEORY: Requirements of good insulating materials: Before selecting an insulating material for a particular application the following properties need to be considered. A] Mechanical Properties B] Thermal Properties C] Environmental including chemical Properties D] Electric Properties E] Economic Consideration A] Mechanical Properties: The mechanical properties which are considered are tensile strength, elongation, tensile modulus, compressive modulus, impact strength, etc. Best of one property does not mean that material chosen will be the best. Mechanability niches are important. Low viscosity liquids are used for X’mer and switchgear. Porosity is another factor for consideration. High porosity materials will absorb moisture. B] Thermal Properties: thermal properties include temperature and time of exposure. In this, what is important is at what temperature one can operate this device for the required lifetime. Properties of materials change at lower temperatures. In general, tensile strength, greater elongation, smaller elongation makes material brittle. Fire is another aspect of thermal problem. The insulating materials used must be stable within the allowed temperatures. The ability of temperature to affect important properties like electrical, mechanical etc. has made thermal properties all the more important. Some of the thermal properties checked for certain insulating materials are melting point, flash point, volatility, thermal conductivity, thermal expansion and heat resistance. C] Environmental Properties including Chemical: Environmental properties including chemical come in picture as to under what kind of operation must the device operate in. Environment includes the effect of air, light, U.V rays, acid, alkalis fumes and humidity. ___________________________________________________ DESIGNED BY, PROF. VIJAY BALU RASKAR
  4. 4. SPARK-KING ….. Unique solution for Learning. VBR - Hydrolysis and oxidation should not occur in the insulating material. They should be chemically stable and offer resistance to oils, solvents, acids and alkalis. - While in use of a material certain chemical changes take place, but its properties should not change. -Some insulating materials absorb moisture and this property is called hygroscopicity. - Ageing of a material occurs due to the effects of heat and chemical action and voltage application. E] Electrical Properties: The actual performance of an electrical circuit is a function not only of the properties of materials but of geometry also. There is an exact analogy with the mechanical properties. From the electric function point of view the most important property is the dielectric strength of the insulation. It is that value of voltage which causes the rupture of the insulating material in practical use. Another important property is the dielectric constant which determines the share of electric stress which is absorbed by the material. Economic may or may not be an important factor for a given application. A good insulating material should have a low dissipation factor, high insulation resistance and good dielectric strength and high mechanical strength. They should have high thermal strength. A good insulating material should have a low permittivity and giving high discharge stress, free from gaseous insulation to avoid discharges. NOTE:- Stick color pictures of the following insulating materials and write it’s Application and Properties. 1. Bakelite 2. Perspex 3. Mica 4. Micanite 5. Fiberglass Also, add few points based on old insulating material problems and disadvantages. Stick insulating material picture from life (Home, Industry etc) ___________________________________________________ DESIGNED BY, PROF. VIJAY BALU RASKAR
  5. 5. SPARK-KING ….. Unique solution for Learning. VBR RESULT:- We understand the different insulating material and observed development of tracks due to ageing on different insulating materials. CONCLUSION:- Thus, we studied different insulating materials properties and its application. ___________________________________________________ DESIGNED BY, PROF. VIJAY BALU RASKAR