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  1. comalcoeng

    High Power Diode Testing

    What are the failure characteristics of silicon diodes? Do they usually completely fail or deteriorate over time? I have a bank of 162 * 400Amp, 1000Vdc diodes to test for reverse leakage current and forward voltage drop versus their specs. However, I am unsure sure if the test results show a...
  2. comalcoeng

    Derive R & X of transformers from Z%?

    I may have been a bit quick off the mark there, this is assuming you are talking about a transformer???
  3. comalcoeng

    Derive R & X of transformers from Z%?

    Look up your local power transformer standard. The Australian Standard gives a range of X/R ratios for various MVA sizes of transformers. Therefore if you don't know X and/or R you can used the X/R ratio given in your standard to solve for X (or R) in the equation above from jghrist if you are...
  4. comalcoeng

    Primary vs Secondary OLTC

    What are the deciding factors or rationale between deciding on whether the On-Load Tap-Changer (OLTC) is on the primary or secondary side? As I understand there are a number of considerations:- * voltage rating - hence if on primary side OLTC is placed toward the neutral of the winding, but a...
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