Insulation assembly, transformer assembly, and dry type transformer

A transformer assembly for use in a transformer, comprising:

• a core;
• an inner coil arranged around the core;
• an outer coil arranged around the inner coil;
• and
• an insulation assembly arranged between the inner and outer coils, the insulation assembly comprising a plurality of tubular insulation barriers adapted to be arranged around the inner coil to electrically isolate the inner coil from the outer coil, each pair of adjacent tubular insulation barriers being separated by a gap and an air blocking element arranged in at least one gap between the plurality of tubular insulation barriers to at least partially block an air flow from passing through the at least one gap, an innermost one of the plurality of tubular insulation barriers being spaced apart from the inner coil to form a first gas channel, and an outermost one of the plurality of tubular insulation barriers being spaced apart from the outer coil to form a second gas channel.

A dry type transformer comprising:

• a first housing provided with a first air inlet and a first air outlet;
• one or more transformer assemblies arranged in the first housing, each transformer assembly of the one or more transformer assemblies comprising:
• a core;
• an inner coil arranged around the core;
• an outer coil arranged around the inner coil;
• and
• an insulation assembly arranged between the inner and outer coils, the insulation assembly comprising a plurality of tubular insulation barriers adapted to be arranged around the inner coil to electrically isolate the inner coil from the outer coil, each pair of adjacent tubular insulation barriers being separated by a gap and an air blocking element arranged in at least one gap between the plurality of tubular insulation barriers to at least partially block an air flow from passing through the at least one gap, an innermost one of the plurality of tubular insulation barriers being spaced apart from the inner coil to form a first gas channel, and an outermost one of the plurality of tubular insulation barriers being spaced apart from the outer coil to form a second gas channel;
• and
• a cooler comprising:
• a second housing provided with a second air inlet in fluid communication with the first air outlet and a second air outlet in fluid communication with the first air inlet;
• a heat exchanger arranged in the second housing to cool the air in the second housing;
• and
• a fan arranged in the second housing to circulate the air between the first and second housings.