2 x Schneider Electric Limited (with Ringmaster RN2C/Ring Main Unit), 1000 kVA, 1100 HV, 433 LV, ONAN cooling class HV transformers built circa 2005


https://0201.nccdn.net/1_2/000/000/17b/c6b/1000kva-transformer-data-plate.jpg
https://0201.nccdn.net/4_2/000/000/081/4ce/ringmaster-image-1.jpg
https://0201.nccdn.net/1_2/000/000/17b/c6b/1000kva-transformer-data-plate.jpg
https://0201.nccdn.net/4_2/000/000/081/4ce/ringmaster-image-1.jpg

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Transformer cooling class letter description

Letter

Letter position

Description

O

1st letter (internal cooling medium)

Liquid with a flash point less than or equal to 300 degrees centigrade

 K

1st letter (internal cooling medium)

Liquid with a flash point greater than 300 degrees centigrade

L

1st letter (internal cooling medium)

Liquid with no measurable flash point

N

2nd letter (internal cooling mechanism)

Natural convection through cooling equipment and windings

F

2nd letter (internal cooling mechanism)

Forced circulation through cooling equipment, natural convection in windings

 D

2nd letter (internal cooling mechanism)

Forced circulation through cooling equipment, directed flow in windings

 A

3rd letter (internal cooling mechanism)

Air

 W

3rd letter (external cooling medium)

Water

 N

4th letter (external cooling medium)

Natural convection

 F

4th letter (external cooling medium)

Forced circulation