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Apparatus for rapid recognition of short-circuits

  • US 4,811,154 A
  • Filed: 07/30/1987
  • Issued: 03/07/1989
  • Est. Priority Date: 08/04/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for rapid detection of short-circuits in an electrical installation comprising means generating an electrical trigger command operating a circuit breaker of the electrical installation in the event of a short circuit comprising an electronic measuring and processing arrangement receiving instantaneous current and voltage values from the electrical installation, said measuring and processing arrangement comprising a digital comparison circuit comparing the current values to pre-settable limit values and transmitting the trigger command in the event the instantaneous current values exceed at least one of the limit values, the measuring and processing arrangement further comprising means for determining from measured variations of the current and the voltage of a power source of the electrical installation the complex impedances and power, said means for determining from the measured variations being coupled to said digital comparison circuit, whereby the detected complex impedances and power and compared to preset limit values of complex power and impedance and said trigger command is generated when at least one of said preset limit values is exceeded.

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