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Recent content by keyrose

  1. keyrose

    Interposing PT open delta to star/star connection.

    Hi everyone, I did mistake in choosing interposing PT. Now I want to use it by changing PT connection. I have 12kV/120V main PT open delta to open deta connection and interposing PT is 120V/120V delta/star connection. Secondary of interposing PT is connected to distance relay. I need 120V...
  2. keyrose

    pt connection

    I have seen pt connection Delta/Delta and one leg of secondary is grounded. What is the purpose of grounding one leg of secondary delta? Can we ground one leg of primary too? I don't think so. I have seen a lot of Delta/Delta power transformer and never seen secondary grounded. Can we ground...
  3. keyrose

    Pts for Metering

    I have seen 2Pts with open delta used for metering as well 3 pts with star or delta connection used for metering. What is difference using 2 pts for metering and 3 pts for metering. When 2 pts are able to measure circuit power why we are using 3 pts for metering? Kiroj
  4. keyrose

    Star-Broken Delta PT rating

    I have circuit of Primary Star secondary broken delta connection connected to 12kv system. Each individual PT ratios are 14400/120 As in star, each PTs are sublected to phase voltage only. Can I select the PT of ratios (14400/1.732)/120 for this connection? Keyrose
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