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Digital filtering of EL CID data

  • US 5,321,362 A
  • Filed: 09/15/1992
  • Issued: 06/14/1994
  • Est. Priority Date: 09/15/1992
  • Status: Expired due to Term
First Claim
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1. An electrical generator inspection system for detecting insulation breakdown between two or more adjacent laminates of a generator stator, and operable to provide enhanced digital signals while maintaining signal integrity, comprising:

  • an electro-magnetic core imperfection detector for providing an analog signal representative of fault currents detected due to defects in the insulation between laminates along the stator core, said analog signal comprising the amplitude of the fault current versus the distance traversed along the length of the stator core;

    an analog-to-digital convertor coupled to said detector for converting the analog signal to a digital signal; and

    a low-pass digital elliptic filter of at least the third order coupled to said converter to substantially remove noise from said digital signal while simultaneously maintaining signal integrity.

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