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Method and apparatus for monitoring an electrical drive

  • US 5,638,051 A
  • Filed: 01/11/1996
  • Issued: 06/10/1997
  • Est. Priority Date: 10/25/1991
  • Status: Expired due to Term
First Claim
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1. An apparatus for monitoring an electrical drive having electric supply lines, the apparatus comprising:

  • a switchgear plug-in unit associated with a direct-current electrical drive and connected into supply lines of the electrical drive;

    voltage pickups and current pickups disposed at said plug-in unit;

    voltage measuring lines in said plug-in unit beginning at said supply lines and ending at said voltage pickups;

    direct current transformers in said plug-in unit being associated with said supply lines without interrupting said supply lines;

    current measuring lines connecting said current transformers to said current pickups;

    a measurement and evaluation unit connected to said voltage pickups and to said current pickups for monitoring said electrical drive; and

    shunts being connected to said supply lines and having two sides and an electrical resistance, and shunt voltage measuring lines each beginning from said supply line at one of said sides of a respective one of said shunts and ending at a respective one of said current pickups, said measurement and evaluation unit determining current intensity from a shunt voltage and said electrical resistance of said shunt.

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