Method and apparatus for detection of brush sparking and spark erosion on electrical machines
First Claim
1. A method for detection of spark activity in an electrical machine having a shaft, the method comprising:
- measuring at least one of a shaft voltage and a shaft current so as to obtain a measured signal;
performing an analysis of the measured signal using an analysis unit;
detecting the spark activity based on the analysis;
tapping off at least one of the shaft voltage and the shaft current using a low-impedance ground connected to the shaft via a contact apparatus and connected to ground, the low-impedance ground including a low resistance connected to the contact apparatus, a high resistance connected to the ground, and a fuse disposed in parallel with the high resistance so as to provide a tapped off signal; and
sending the tapped off signal to the analysis unit for analysis.
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Accused Products
Abstract
A method and apparatus for detection of spark activity in an electrical machine having a shaft, wherein at least one of the shaft voltage and the shaft current is measured and analyzed for components which are characteristic of spark activity. The method uses the shaft voltages and/or shaft currents which are normally generally regarded only as being damaging has been found to be accurate and to be suitable for long-term monitoring of spark activities such as brush sparking, spark erosion, spark flashovers between parts of the shaft bearings and can be implemented physically very easily and in a reliable manner, since the existing grounding devices are used.
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Citations
24 Claims
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1. A method for detection of spark activity in an electrical machine having a shaft, the method comprising:
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measuring at least one of a shaft voltage and a shaft current so as to obtain a measured signal; performing an analysis of the measured signal using an analysis unit; detecting the spark activity based on the analysis; tapping off at least one of the shaft voltage and the shaft current using a low-impedance ground connected to the shaft via a contact apparatus and connected to ground, the low-impedance ground including a low resistance connected to the contact apparatus, a high resistance connected to the ground, and a fuse disposed in parallel with the high resistance so as to provide a tapped off signal; and sending the tapped off signal to the analysis unit for analysis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for detection of spark activity in an electrical machine having a shaft, the apparatus comprising:
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a grounding module disposed at a point on the shaft and configured to tap off at least one of a shaft voltage and a shaft current so as to provide a measured signal; an analysis unit configured to analyze the measured signal for at least one component characteristic of spark activity; and a low-impedance ground connected to the shaft via a contact apparatus and connected to a ground, the low-impedance ground including a low resistance connected to the contact apparatus, a high resistance connected to the ground, and a fuse disposed in parallel with the high resistance, wherein the low-impedance ground is configured to tap off at least one of the shaft voltage and the shaft current so as to provide a tapped off signal and to send the tapped off signal to the analysis unit for analysis. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification