Electrical installation design guide - Table F5

I can't find where they got the infomation in this table from. 

I have checked ENA engineering recommendation P29 but there does not seem to be any tables. 

I would like to find out the resistance and reactance of a 2500kva transformer.

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  • I can't find where they got the infomation in this table from.

    Thank you for highlighting this  .

    The reference in the Note is specifically to Table D6 of ENA Engineering Recommendation P29 Issue 1 is clearly not correct, probably a typo at some stage in development of the 4th Edition. (P29 Issue 1 is still available on-line here: https://www.nienetworks.co.uk/documents/d-code/distribution-system-security-and-planning-standard/ena_er_p29.aspx. Definitely no Table D6!)

    The correct reference is Table D6 of ENA ER P28 Issue 1 (1989) - but that has been superseded now and updated distribution transformer data is not provided in the latest version.

    For a new design, it would be more correct, I guess, to use manufacturer data for the new energy-efficient transformers, to meet current legislation, in any case. (The data in this particular case is used in EIDG for example calculations only, to illustrate principles, and perhaps both of these should also be highlighted in the Note to Table F.5.)

    I will flag this to the IET for correction at the next opportunity.

Reply
  • I can't find where they got the infomation in this table from.

    Thank you for highlighting this  .

    The reference in the Note is specifically to Table D6 of ENA Engineering Recommendation P29 Issue 1 is clearly not correct, probably a typo at some stage in development of the 4th Edition. (P29 Issue 1 is still available on-line here: https://www.nienetworks.co.uk/documents/d-code/distribution-system-security-and-planning-standard/ena_er_p29.aspx. Definitely no Table D6!)

    The correct reference is Table D6 of ENA ER P28 Issue 1 (1989) - but that has been superseded now and updated distribution transformer data is not provided in the latest version.

    For a new design, it would be more correct, I guess, to use manufacturer data for the new energy-efficient transformers, to meet current legislation, in any case. (The data in this particular case is used in EIDG for example calculations only, to illustrate principles, and perhaps both of these should also be highlighted in the Note to Table F.5.)

    I will flag this to the IET for correction at the next opportunity.

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