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LIMITS OF TRANSFORMER TEMP. RISE

발전플랜트/변압기(Transformer)

by ElecMania 2015. 1. 7. 10:50

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LIMITS OF TRANSFORMER TEMP. RISE
               
No. Description IEC60076-1, 2000
IEC60076-2, 1993
IEC60354, 1991
IEEE C57.91-1995
IEEE C57.12.00-2000
Conclusion Remarks
1 Reference Temperature -25 +40 clause 1.2.1 of IEC60076-1 -30℃∼ +40 clause 4.1.2.1 of IEEE C57.12.00
clause 6.4 of IEEE C57.91
Design temp is 40  
2 Temperature Rise at Top-Oil 60K clause 4.2 of IEC60076-2 65 clause 9.2.1 Table 8 of IEEE C57.91 Different  
3 Temperature Rise at Winding 65K For transformers identified as ON.. or OF..
clause 4.2 of IEC60076-2
65 clause 5.11.1.1 of IEEE C57.12.00 65 rise @40
(But 70
rise @OD.. cooling as per IEC)
 
    70K For transformers identified as OD..
clause 4.2 of IEC60076-2
     
4 Winding Hot Spot Temperature up to 110 clause 2.6.1 of IEC60354
Reference value is 98
. But transformer with thermally upgraded insulation, the normal life expectancy is based on Hot Spot Temperature 110.
80 rise clause 5.11.1.1 of IEEE C57.12.00
clause 9.2.1 Table 8 of IEEE C57.91
80 rise @40  
5 Core, of electrical connections outside the windings or of structural parts in the tank No numerical limit clause 4.2 of IEC60076-2 Not excess of the winding hottest-spot temp. rise clause 5.11.1.3 of IEEE C57.12.00 No limits  

 

 

 

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