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Found 2 results

  1. Hello, I am trying to determine the settings on an old GE electromechanical relay. There are three settings, pickup, time dial, INST. The time dial and INST values seem fairly straight forward. The pickup values howver show a plate with screws (see attached picture). How are you to determine the settings? Is it based on the placement of screws or is there a plate behind the cover that needs to be seen? Thanks in advance for any help or advice.
  2. Hi all, I know what relays are, but am not familiar with the different types or their common uses. This was brought to light in a Complex Imaginary question (variation 1, question #68) that mentions the following types: impedance, differential, overcurrent, and voltage. It says that impedance relays are useful in setting up zones of protection in transmission applications. I had incorrectly guessed that overcurrent relays were the correct device to use in this setting. I searched online but couldn't find a good summary of these types of relays and their common uses. Wikipedia doesn't have good info and Blackburn is way too detailed. Any help is very appreciated. Thanks!
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