×

Fault indicator having auxiliary fault sensing winding

  • US 5,677,678 A
  • Filed: 04/08/1996
  • Issued: 10/14/1997
  • Est. Priority Date: 04/08/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. A fault indicator for indicating an occurrence of a fault current in an electrical conductor of a monitored cable comprising:

  • a housing;

    status indicating means within said housing, said status indicating means having a reset indicating state and a fault indicating state;

    a magnetic pole assembly mounting said housing to said monitored cable;

    a first magnetic core within said magnetic pole assembly, said first magnetic core being responsive to a current in said electrical conductor;

    a second magnetic core within said magnetic pole assembly, said second magnetic core being responsive to said occurrence of said fault current in said electrical conductor;

    reset circuit means for conditioning said status indicating means to said reset indicating state, said reset circuit means including a reset power winding wound on said first magnetic core, said reset power winding being energized by said current in said electrical conductor; and

    trip circuit means for conditioning said status indicating means to said fault indicating state in response to said occurrence of said fault current in said electrical conductor, said trip circuit means including an auxiliary fault sensing winding independent of said reset power winding and wound on said second magnetic core, said auxiliary fault sensing winding and said second magnetic core being disposed within a perimeter of said first magnetic core, said auxiliary fault sensing winding being energized by said fault current in said electrical conductor.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×