High Voltage
2013
ELE 402 HIGH VOLTAGE TECHNIQUESAPPLICATIONS OF INSULATING MATERIAL IN POWER TRANSFORMER
APPLICATIONS OF INSULATING MATERIAL IN POWER TRANSFORMER
Insulating fluids (gases and liquids) provide insulation between phases and grounded parts of electrical equipments. These also carry out heat from the windings of the electrical equipments However, solid insulating materials are used only to provide insulation only. Why insulation is important . Because human safe is important. Power transformer inside is very big current and voltage to moving if don’t take a protection or neglect transformet can be burn or controlling attendant can be exposed very huge voltage.
All electrical systems require some kind of insulation to prevent short circuits and leaking currents.
3 forms of insulators: Solid, liquid and gaseous Performance of these insulators depend on the temperature.
Classification according to their temperature rating:
International Electrotechincal Commission has categories various insulating materials depending upon the temperature of operations of the equipments under the following categories. What insulating materials are used for a particular apparatus depending upon it’s ratings and environmental condition where the apparatus is required to operate.
Power Transformers
For small rating, the coils are made of super-enamelled copper wire. For layer to layer, coil to coil and coil to ground (iron core) craft paper is used. However, for large size transformers paper or glass tape is rapped on the rectangular conductors whereas for coil to coil or coil to ground, insulation is provided using thick radial spacers made of pres board or glas fibre.
Low power transformer High power transformer In oil-filled transformers, the transformer oil is the main insulation.
ELE 402 HIGH VOLTAGE TECHNIQUESAPPLICATIONS OF INSULATING MATERIAL IN POWER TRANSFORMER
APPLICATIONS OF INSULATING MATERIAL IN POWER TRANSFORMER
Insulating fluids (gases and liquids) provide insulation between phases and grounded parts of electrical equipments. These also carry out heat from the windings of the electrical equipments However, solid insulating materials are used only to provide insulation only. Why insulation is important . Because human safe is important. Power transformer inside is very big current and voltage to moving if don’t take a protection or neglect transformet can be burn or controlling attendant can be exposed very huge voltage.
All electrical systems require some kind of insulation to prevent short circuits and leaking currents.
3 forms of insulators: Solid, liquid and gaseous Performance of these insulators depend on the temperature.
Classification according to their temperature rating:
International Electrotechincal Commission has categories various insulating materials depending upon the temperature of operations of the equipments under the following categories. What insulating materials are used for a particular apparatus depending upon it’s ratings and environmental condition where the apparatus is required to operate.
Power Transformers
For small rating, the coils are made of super-enamelled copper wire. For layer to layer, coil to coil and coil to ground (iron core) craft paper is used. However, for large size transformers paper or glass tape is rapped on the rectangular conductors whereas for coil to coil or coil to ground, insulation is provided using thick radial spacers made of pres board or glas fibre.
Low power transformer High power transformer In oil-filled transformers, the transformer oil is the main insulation.