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  • Users: ZapSib
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  1. ZapSib

    Current transformers transient behaviour

    Hello, I am looking for the following article but was not able to locate it. Does anyone knows where can I get it ? Author is N.E. Korponay and title is " the transient behaviour and use of current transformers". It comes from brown bovery review, 1975. Thanks in advance.
  2. ZapSib

    Generator protection : Loss Of Field

    G'Day, I am dealing with setting schedule for generator protection. For LOF (ANSI 40) one customer request to get the protection locus among the P/Q capability diagram. What I get used to is to compute and draw the characteristic within the R/X diagram. Do you have experience with the P/Q...
  3. ZapSib

    CT class X

    This is a IEC world background question. Class X CT were firstly define in British Standard 3938 now obsolete. High Z scheme ( such as REF) are still use, therefore the need for such CT. Such CT call for Vk, Rct and Imag requirements. IEC 60044-1 define class PX with the same requirements...
  4. ZapSib

    CT specification.

    Hello, I am dealing with specification of CT cores in order to ensure the correct operation of protective relays. The specification is mainly done in accordance with IEC 44-1 (formerly IEC185) and also IEC 44-6. A required data is Rct (internal secondary resistance of the CT). Estimation of...
  5. ZapSib

    voltage vs. frequency operating limits for sync. generator

    I went acrros several generator data sheets. A standard capability curve is "voltage vs. frequency operating limits". I do understand there is a min. and a max. values for both frequency and voltage. I also understand there is 2 limits zones : one for permanent operation whithin the second one...
  6. ZapSib

    ethernet to RS 485 interface

    Hi, I am trying to source such interface for HV (330 kV) control room. any references you will recommand ? thanks.

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