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(12) PATENT APPLICATION PUBLICATION
(19) INDIA (21) Application No.: 00087/KOL/2004 A
(22) Date of filing of Application: 03.03.2004 (43) Publication Date: 09/06/2006
(54) Title of the invention: METHOD AND ARRANGEMENT FOR ESTIMATION OF THE ARC EROSION OF SWITCHING
CONTACTS
(51) International classification : H02J 13/00; H01H
1/00
(31) Priority Document No : 10312504.3
(32) Priority Date : 14.03.2003
(33) Name of priority country : GERMANY
(86) International Application No and : NA
Filing Date
:
(87) International Publication No : NA
(61) Patent of addition to Application No : NA
Filed on : NA
(62) Divisional to Application No : NA
Filed on : NA
(57) Abstract:
In order to improve a method for estimation of the arc
erosion of switching contacts which are designed to interrupt an
electric current, in which digital sample values are formed at a
sampling clock rate by sampling a measurement variable which is
related to the current in an already known manner, and the digital
sample values are compared with at least one assessment
parameter which is stored in a protective function block (7) and are
checked for the presence of a tripping condition, so that a tripping
signal is produced in order to disconnect the switching contacts
if the tripping condition is satisfied in a tripping time t0ff such that the
arc erosion of the switching contacts can be estimated, it is proposed
that switching current values with the same mathematical sign are
formed from the sample values, that a start time tstart is defined as a
function of the tripping time toff, and that the switching current values
with the same mathematical sign which follow the start time tstart
are added up to form a switching current integral value until a
predetermined integration period has passed or an end time which is
determined from the sample values is reached, and with the switching
current integral value being added to the sum of the already
determined switching current integral values forming an integral
sum, and the integral sum being used for estimation of the wear of
the switching contacts.
(FIG.1)
(71) Name of Applicant:
SIEMENS AKTIENGESELLSCHAFT
Address of the Applicant:
WITTELSBACHERPLATZ 2, 80333
MUNCHEN, GERMANY
(72) Name of the Inventor:
EDUARD SCHNEERSON
Filed U/S 5(2) before The Patents (Amendment)
Act, 2005: NO
The Patent Office Journal 09/06/2006 10953