Method for monitoring the signal quality of an electrostatic precipitator and electrostatic precipitator

Patent metadata

Field	Value
Publication number	US-2016339448-A1
Application number	US-201615154005-A
Country	US
Kind code	A1
Filing date	May 13, 2016
Priority date	May 20, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

The method for monitoring the signal quality of an electrostatic precipitator comprises measuring in real time at least one feature of a primary electric power sent to a transformer of the electrostatic precipitator and/or at least one feature of a secondary electric power sent to the collecting electrodes and discharge electrodes of the electrostatic precipitator, elaborating the at least a measured feature generating an information indicative of the electrostatic precipitation signal quality, providing the information.

First claim

1 . A method for monitoring signal quality of an electrostatic precipitator, the electrostatic precipitator comprising collecting electrodes and discharge electrodes electrically connected to a transformer, the transformer provided with primary electric power and providing secondary electric power, with the transformer connected to a controller, the method comprising:
measuring in real time at least one feature of the primary electric power and/or at least one feature of the secondary electric power; elaborating at least a measured feature generating an information indicative of the signal quality; and providing the information.

2 . The method of claim 1 , wherein the feature is voltage and/or current.

3 . The method of claim 1 , wherein the feature is a primary voltage, and elaborating comprises obtaining a spectrum analysis of the primary voltage and calculating a percentage of power associated to a given harmonics with respect to power associated to all harmonics of the primary voltage.

4 . The method of claim 1 , wherein the feature is a primary voltage, and elaborating comprises calculating a zero cross deviation of the primary voltage.

5 . The method of claim 1 , wherein the feature is a secondary voltage, and elaborating comprises obtaining a spectrum analysis of the secondary voltage and calculating a percentage of power associated to a given harmonics with respect to power associated to all harmonics of the secondary voltage.

6 . The method of claim 1 , wherein the feature is a secondary voltage, and elaborating comprises calculating a derivative of the secondary voltage with respect to time.

7 . The method of claim 6 , wherein elaborating further comprises selecting a maximum negative derivative of the secondary voltage.

8 . The method of claim 1 , wherein the feature is a primary current, and elaborating comprises obtaining a spectrum analysis of the primary current and calculating a percentage of power associated to a given harmonics with respect to power associated to all harmonics of the primary current.

9 . The method of claim 1 , wherein the feature is a secondary current, and elaborating comprises obtaining a spectrum analysis of the secondary current and calculating a percentage of power associated to a given harmonics with respect to power associated all harmonics of the secondary current.

10 . The method of claim 1 , wherein providing the information comprises displaying the information on a monitor or generating a report or activating an alarm.

11 . An electrostatic precipitator comprising:
collecting electrodes and discharge electrodes electrically connected to a transformer; the transformer provided with primary electric power and providing secondary electric power, with the transformer connected to a controller; at least a sensor for measuring in real time at least one feature of the primary electric power and/or at least one feature of the secondary electric power; a control unit for elaborating the measured feature generating an information indicative of signal quality; and an interface for providing the information.

12 . The electrostatic precipitator of claim 11 , wherein the control unit is part of or is embedded in the controller.

13 . The electrostatic precipitator of claim 11 , wherein the interface comprises a monitor, a user that generates a report, or systems that generate an alarm.

Assignees

• Alstom Technology Ltd

Inventors

• Dash Nanda Kishore
• Singh Niraj Kumar
• Pettersson Elisabeth
• Williamsson Carl Marcus

Classifications

• B03C3/68 Primary

  Control systems therefor {(electricity supply or control systems for cleaning the electrodes B03C3/746, B03C3/763)} · CPC title

• G01R21/00

  Arrangements for measuring electric power or power factor (G01R7/12 takes precedence) · CPC title

• B03C3/04

  dry type · CPC title

• G01R29/26

  Measuring noise figure; Measuring signal-to-noise ratio · CPC title

• G01R23/16 Primary

  Spectrum analysis; Fourier analysis · CPC title