The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 2003
Filed:
Feb. 05, 2002
Manfred Kleemeier, Neutraubling, DE;
Reinhard Solleder, Lappersdorf, DE;
Reinhard Schmid, Regensburg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A protective device against fault currents includes a triggering arrangement for performing at least the functions of detecting a fault current and/or triggering power-down of the network to be protected. The triggering arrangement, outside the most strict quartic curve (A), corresponds to the protection of persons in case of indirect contact, and below the triggering quartic curve (B), corresponds to protection against fire. The triggering quartic curve (B) satisfies the relationship: I (f)/I =F(f)=B=const., wherein I (f)=W /U . In the relationships, I (f) represents the limit fault current permissible for the corresponding frequency, where there is still no risk of fire; I represents the nominal triggering fault current at the frequency of the network taking into consideration the protection of persons; W represents the power limit in watt required for protection against fire; U represents the network voltage to be protected and F(f) represents what is called the frequency factor.