Power conditioning device and method

  • US 5,448,443 A
  • Filed: 07/29/1992
  • Issued: 09/05/1995
  • Est. Priority Date: 07/29/1992
  • Status: Expired due to Term
First Claim
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1. A device for suppressing transient currents in a three-wire power distribution system powering a grounded electrical load, the distribution system providing alternating current power at a reference frequency and separate voltage and reference potentials, and providing a reference ground, comprising the combination of:

  • isolation transformer means having primary and secondary windings providing respective input and output terminals,said input and output terminals being magnetically coupled while being isolated from direct electrical connection to each other,said input terminals being electrically coupled to the alternating current power, the input terminals respectively being comprised as voltage and reference inputs and said output terminals respectively being comprised as voltage and reference outputs,said output terminals being electrically coupled to the electrical load, the isolation transformer then isolating the electrical load from the power distribution system, andthe electrical load around and the reference output being electrically coupled together as a safety ground; and

    electrical inductive impedance means, electrically coupled in series between the safety around and the reference around, for providing electrical isolation between said safety ground and said reference ground.

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