Recent content by iskar2000

Thank you for reply But my problem is that I have not these standards and cannot get them. If somebody know exact request of the ANSI standards about thermal short-circuit current of bushings and How to choice the rated current of the bushings according request above and What is relation...

Thermal Short Circuit withstand of the Transformer Bushings Hi all, Please somebody to say me what is required by ANSY for choosing of the transformer bushings analogy to request in IEC137 the thermal current of the transformer bushing to be equal to rated current of the transformer bushing...

Winding Temperature Rise by ANSI Hi all, Please somebody to say me what is different between 55 and 65 C temperature rise when design a transformer. How to decide what of the two values to use.

YNao,yno+d?

Hi all, Please somebody to say me, Is it posible Autotransformer with 3 work voltage + compensation winding (6kV)? If it is posible, please say me What will be vector group of such autotr-r....YNynaO+d may be?

I'm find in internet a table with relations of kVA ratings between different type of cooling and between different temperature rise 55oC and 65oC http://www.pti.sk.ca/table2.htm but my problem is that I receive specifications where it are given two ratings example: 2.25MVA at 55oC and...

Thank to all for your answer to now I woul like to make more precise I speak about design of new transformer (not about exist)with requiremens about sond level no more than 60dB

Please tel me what is the difference between OA\FA and ONAN\ONAF? What mean when it is said that power ratings are given at OA ta 55oC and FA at 56oC temperature rise? Where I can read something more about it except ANSI?

Please, would you let me know any method of decreasing noise level of power transformer 40MVA ONAN 123kV to 60dB (A)

Hi! I have find old NEMA standard (1970) : System voltage RIV level 23.0-34.5 650 46.0-69.0 1250 115.0-138.0 2500 161.0-345.0 5000 but I thing this level now are 10 time lower. Can some body give me right...

HI! Please somebody to say me which standard determines the value of Radio Interference voltage for power transformers with diferent capacity. Particulary for power transformer 220kV what standart I can get RIV value from? What is WAPDA requirements?

I'm looking for construction of oil filled cable box 132kV with disconnecting chamber