Intergrating reset overcurrent relay
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United States of America Patent
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May 12, 1998
Grant Date -
N/A
app pub date -
Feb 28, 1996
filing date -
Feb 28, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A relay for monitoring an electrical system to protect the electrical system from an overcurrent condition as a time dependent function of an electrical current level in the electrical system is disclosed. The relay includes a memory which stores a current level count and a current level detector coupled to the electrical system which detects the electrical current level in the electrical system over time. A microprocessor responds to the current level detector by varying the current level count in the memory as a function of the electrical current level over time. The microprocessor also detects an occurrence of the electrical current level falling below a minimum current level. A timer responds to the microprocessor by measuring a period of time during which the electrical current level is less than the minimum current level. The microprocessor responds to the timer by varying the current level count in the memory as a function of the measured period of time during which the electrical current level is below the minimum current level. A method of monitoring an electrical system to protect the electrical system from an overcurrent condition as a time dependent function of an electrical current level in the electrical system is also disclosed. Other apparatus and methods are also disclosed.
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