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  • Users: PERRO
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  1. PERRO

    transformer impedence testing

    You can do the test with low voltage, you need a three-phase low voltage source to aplly excitation voltage for possitive sequence test and one-phase for cero sequense test. You can find the procedure for this test in the IEEE Std. C57.12.90-1999.
  2. PERRO

    Transformer differential protection

    What about the fault record, what you see?
  3. PERRO

    Operating Frequency of Transformers

    Look the IEEE Std C37.91-2000 Item 8.2.4 "Overexitation protection" This is a good explication about the peterb comment.
  4. PERRO

    CT saturation with differential protection

    You can read the IEEE Std C37.110-1996: IEEE Guide for the aplycation of current transformer used for protective relaying purposes. Chapter 4.5 : Dynamic characteristic.
  5. PERRO

    Dry type Power/distribution transformer zero sequence measurement meth

    You can find the procedure of how to measure the Zo for Dry type transformer in the IEEE C57.12.91-2001 standard. If you hahe a transformer whit only une neutral point externaly: Basically you need a AC monophasic source to excit the windings, cables and another hardware to connect and of...
  6. PERRO

    GEC CDG14 Overcurrent relay curves

    Do you know where I can find the curves of a GEC CDG14 overcurrent relays, or where I can find the B.S. 142:1966 standar?
  7. PERRO

    Transformer differential protection

    What you see in the oscilographic register next to trip? If you see only load curren the problem is in the relay set or wiring.
  8. PERRO

    Transformer differential protection

    The 7UT513 relay have a tool for comisiioning, if you are sure about the transformer is OK, try this. 1. Change the setting 1601 to "Trip bloked". 2. Put the transformer on load. 3. Whit the transformer in service, verify Idiff and Ibias. Many problems in this relay in my company...
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