snubber design guide for 36kv transformers
snubber design guide for 36kv transformers
(OP)
I am looking for a procedure to calculate the values of R and C in a RC snubber circuit for 38kV transformer. I don't have the appropriate textbooks to refer to at the moment and would highly appreciate any help/suggestion regarding the design procedure.






RE: snubber design guide for 36kv transformers
short-cicuit impedance[%]?
RE: snubber design guide for 36kv transformers
The transformer ratings are:
38kV insulation/26.4kV-587V/150kV BIL
Impedance: 7.2% on 1/2 KVA base
It has been provided with a station class Surge arrestor rated for 36kV.
I am looking to calculate the values of R and C for the snubber.
Thanks.
RE: snubber design guide for 36kv transformers
The problem is not only the snubber but also the measurement of PD.
You may follow IEC 60270 proceeding .See: htt
or "Snubber circuit calculation" http://www.hagtech.com/pdf/snubber.pdf
or "DESIGN OF SNUBBERS FOR POWER CIRCUITS" http://www.cde.com/tech/design.pdf
But I think what do you need it is a PD detector like this [for instance] http://www.cde.com/tech/design.pdf
RE: snubber design guide for 36kv transformers
I am actually looking to design a RC snubber circuit as shown in figure 2 of the attachment file here. The transformer in my case is rated for 2MW.
I am really uncertain about the design criteria as to the variables I should consider for the design.
Thanks
RE: snubber design guide for 36kv transformers
RE: snubber design guide for 36kv transformers
RE: snubber design guide for 36kv transformers
See, for instance, Toshiba recommendations for Vacuum Circuit Breaker (VCB) Application for Surge.
htt
or Cutler-Hammer:
http://www.farah.com.jo/up_to_date_files/2.PDF
A combination of arrester and RC circuit named ZORC is recommended for dry transformer[less then 2 MVA] at voltage of 36 kV. [See TABLE VII: Transformer Protection on page 23]
Also this link may be useful:
h
RE: snubber design guide for 36kv transformers
But my position in this snubber circuit is such that I need to find some documents which explicitly states some design techniques, some formula, expression etc for calculating the resistor and capacitor values of a RC snubber which my boss can point out in the bidding document for contractors.
I went through with the documentation in abb website but havenot been able to find out something discrete as my boss desires.
Thank you prc and thank you 7anoter4.