Process for determining the loading condition of a diode...

Details Process for determining the loading condition of a diode... Process for determining the loading condition of a diode...

2005-06-21

2009-02-10

Patel, Paresh (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

Reexamination Certificate

active

07489124

ABSTRACT:
A process is disclosed for determining the charging state of a diode rectifier (4) of a frequency converter (2) connected to a supply grid (18). According to the invention, a rectifier current (iZKnetz) is determined on the basis of a measured intermediate circuit voltage (UZK) and of measured motor currents (i1, i2, i3), and the rectifier current (iZKnetz) is compared with a predetermined threshold value, any upper deviations are stored and the frequency of the deviations within a predetermined time period, which represents a measure of the charging state, is determined. This permits a frequency converter (2), which is connected to a supply grid (18) and has a diode converter (4) on the side of the grid, to determine without difficulty the charging state of its diode rectifier (4) after temporary grid voltage breakdowns, so that the diodes of the diode rectifier (4) need no longer be oversized.

REFERENCES:
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“Mehr Qualität für ihr Netz: dank ewz und Siemens”, Firmenzeitschrift ewz und Siemens, anlässlich einer Tagung am 4-6 Mai 2004 erstellt.
Netzqualitätsregistrierer SIMEAS Q, Siemens-Produktkatalog SR 10.2.5, Ausgabe 2003.
Auszug aus der Siemens-Firmenschrift “Slcaro PQ Software zur Diagnose der Netzqualität”, Ausgabe 01.02.00, S. 1-1 sowie 5. 4-41 bis 4-44.

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