Patent · US Expired

Protective device against fault currents for protection against fire

US6614638B1 · kind B1 · utility

1Cited by

0References

8Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Manfred Kleemeier · Neutraubling, DE
Reinhard Solleder · Lappersdorf, DE
Reinhard Schmid · Regensburg, DE

Key dates

Filing date	Feb 5, 2002
Grant date	Sep 2, 2003
Priority date	—
Expiry date	Feb 5, 2022

Classification

Technology area (CPC H)Electricity
CPC primaryH02H3/33
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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: ILimit(f)/I&Dgr;n=F(f)=B=const., wherein ILimit(f)=WFire/UNetwork. In the relationships, ILimit(f) represents the limit fault current permissible for the corresponding frequency, where there is still no risk of fire; I&Dgr;n represents the nominal triggering fault current at the frequency of the network taking into consideration the protection of persons; WFire represents the power limit in watt required for protection against fire; UNetwork represents the network voltage to be protected and F(f) represents what is called the frequency factor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.