Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2005-06-21
2009-11-24
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C363S034000, C363S037000, C307S125000, C307S126000, C307S129000, C307S130000, C307S131000, C700S294000, C700S293000, C700S297000
Reexamination Certificate
active
07622886
ABSTRACT:
The invention relates to a method for determining the chance of a disturbance-free operation of a frequency converter (2) connected to a feeding network (18). According to the invention, during the operation of said frequency converter (2), an intermediate circuit voltage (UZK) is continuously measured and a network-side intermediate circuit current (iZKmains) is continuously determined; these measuring quantities are compared with pre-determined operating values of the frequency converter (2), and quantities which are higher or lower than said values are respectively stored; and the frequency (Hij) of said higher and lower measuring quantities is determined and converted into a characteristic number for the quality of the feeding network (18). As said characteristic number decreases, the chance of a disturbance-free operation of the frequency converter (2) increases. In this way, a frequency converter (2) is able to detect the risk of appliance disturbance or failure as a result of network disturbances before the operation is interrupted.
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Day Ursula B.
Feiereisen Henry M.
Leykin Rita
Siemens Aktiengesellschaft
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