Significance of transformer drying oven in removing moisture
Transformer drying process removes traces of moisture in the transformer oil, besides enhancing insulation resistance and flashover voltage of transformers. The drying process is almost a part of production and is done regularly. Moisture management is an important aspect of transformer maintenance because moisture is connected to ageing and deterioration of the equipment.
When the insulation gets damp and accumulates moisture, its
functionality and heat transfer are affected. Insulation between various phases
of the transformer is important attribute because it decides the lifespan of
the transformer.
Paper and insulating oils are insulation medium and
insulation is affected when such paper absorbs water which in turn conducts
electricity. If insulation of the transformer is not in prescribed levels, it
results in surge of electricity which the transformer might not withstand and
ultimately breakdown or collapse in failure.
The transformer
drying oven distinguishes pressure difference between water vapour in the
insulation and that around the insulation. The drying time is directly
proportional with the operating voltage and transformer size.
The
transformer drying oven is kept in supervision and must never be left
unattended since it might lead to damage of insulating material. They must also
be in the absence of smoke or sparks.
The windings in the transformer play a crucial role in the
lifespan and activities of the equipment. The windings remove the moisture
which in turn damages the dielectric strength of the transformer and increases
ageing of the apparatus.
While employing a drying
oven, two parameters namely control over drying temperature and enhancement
of vacuum degree of the equipment, are emphasized.
Drying
ovens are popular for their simple operations and uniform removal of
moisture. The insulation is heated which releases the water content in the
inner layers as vapour which is transported to the outer layers.
Conventional methods are tricky in assuring the removal of
moisture content and hot
air circulation system is preferred owing to use of vacuum which ensures
the efficiency of moisture removal.
Drying
oven is customized based on their oven size, type of air circulation and
applications.
Hot
air circulation system plays a vital role in drying out the core coil of
the transformer which effectually removes moisture. 112 degree Celsius and 120
degree Celsius is set as temperature range in the core coil and definite
temperature inside the oven is 125 degree Celsius, which is apt setting for drying
oven in distribution transformer.
The dielectric power loss is measured as loss factor and
this loss is decreased as moisture decreases. However, the loss factor is not
related to the insulation area or thickness or physical parameters.
The prescribed oven temperature at 120 degree Celsius is
based on maintaining safety attributes between conductor and insulation layers.
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