Abb Power Td & Company

Abb Inc.

Mitsubishi Hitec Paper Europe Gmbh

Bernhard Bachmann

David G Hart

Damir Novosel

Murari M Saha

Yi Hu

Dieter Becker

Rainer Ueckerdt

Hermann Penner

Stefan Rodewald

Christian Elsner

A method for the production and/or processing of a web-shaped material, particularly paper, with at least one measuring system which records m measurement values yper measurement position over at least a portion of the width s of the web-shaped material at n different measurement positions within a fixed time interval &#x394;t. The method is characterized in that the method includes determining a rational quality number Q, the value of which for a quality of the web-shaped material that is considered acceptable lies within an acceptance range which is to be empirically determined for the production process and which has a lower limit U and an upper limit O, where U and O are in each case rational numbers.

Method for producing web-like material

An accurate impedance measurement method for a power system transmission line is disclosed for improving various protection functions, i.e., distance protection and/or fault location estimation. The method is less sensitive to harmonics and other transient problems introduced to power systems by series capacitance and the like, and is easily incorporated into existing protective relays. In the method, a number (n) of current and voltage samples (I , V ) representative of values of current and voltage waveforms are measured, respectively, at successive instants of time on a conductor in a power system. The number n is an integer greater than I and the index k takes on values of 1 to n. Resistance (R) and inductance (L) values are computed in accordance with an equation in which R and L are related to sums of differences in values of successive current and voltage samples. A prescribed power system function is then performed based on the computed R and L values.

Impedance measurement system for power system transmission lines

A reach-measurement method is used in connection with a series-compensated line of a power system. The series-compensated line includes an installed series capacitance having a bus side and a line side, and a non-linear protection device parallel to the installed series capacitance. The series-compensated line has a line current, a bus side voltage, and a line side voltage. The series capacitance and the non-linear protection device have a capacitance voltage thereacross equal to the bus side voltage minus the line side voltage. In the method, a number (n) of line current samples are measured, where such samples are representative of values of a line current waveform at successive instants of time on the series-compensated line. Capacitance voltage values are computed based on the measured line current samples in accordance with an equation which takes into account the non-linear protection device parallel to the installed series capacitance. A prescribed power system function is then performed based on the computed capacitance voltage values.

Reach-measurement method for distance relays and fault locators on series-compensated transmission lines using local information

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Bielefeld, Germany

Bernhard Bachmann