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How to select bushing insulators?

Transformer end-users (used bushing insulators) normally provide strict specifications for transformers which include Regional or Industry Standards as well as the electrical requirements.

bushing insulator

bushing insulator construction

How to select bushing insulator, you can think about that bushing insulators are typically chosen using the following characteristics:
◆ Transformer type, such as Oil Filled/Cast Resin /Pole Mounted / Distribution / Power etc.
◆ Bushing type / application i.e. Outdoor or Indoor
◆ Basic Impulse insulation Level. This is the momentary fault voltage that the bushing can withstand. It is verified by Lightning Impulse Withstand Test
◆ Bushing operating Voltage – normally expressed in kV
◆ Bushing current carrying capacity
◆ Creepage / Protected creepage distance
◆ Connection type i.e. screwed/plain/palm/flag/block/flexible/plug-in
◆ Required Regional or Industry Standard.

There are also many factors influence your choices, such as the price of bushing insulator, bushing insulator quality, voltage, and other performance.

 

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