Device and method for monitoring and/or analyzing rotors of electric machines in operation
First Claim
1. A method for monitoring and/or analysis of electrical machines, wherein the electrical machine has at least one generator with a shaft, an exciter system and a drive device that drives the shaft, the method comprising:
- measuring a first signal, which at least indirectly describes the operating voltage across a rotor winding, and simultaneously measuring a second signal, which at least indirectly describes the operating current flowing through the rotor winding, during operation;
supplying the first and second signals to an analysis unit;
splitting the first and second signals into individual frequency components in the analysis unit; and
determining the impedance of the rotor winding in order to identify fault states in the electrical machine.
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Accused Products
Abstract
A method is provided for monitoring and/or analysis of electrical machines during operation. An electrical machine has at least one generator with a shaft, an exciter system and drive device that drives the shaft. In this case, a first signal, which describes a voltage across a rotor winding, and a second signal, which describes a current flowing through the rotor winding, are measured simultaneously. The two signals are supplied to an analysis unit. The signals are split into individual frequency components in the analysis unit. The impedance of the rotor winding is then determined in order to identify fault states in the electrical machine.
48 Citations
17 Claims
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1. A method for monitoring and/or analysis of electrical machines, wherein the electrical machine has at least one generator with a shaft, an exciter system and a drive device that drives the shaft, the method comprising:
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measuring a first signal, which at least indirectly describes the operating voltage across a rotor winding, and simultaneously measuring a second signal, which at least indirectly describes the operating current flowing through the rotor winding, during operation; supplying the first and second signals to an analysis unit; splitting the first and second signals into individual frequency components in the analysis unit; and determining the impedance of the rotor winding in order to identify fault states in the electrical machine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. An apparatus for monitoring and/or analysis of an electrical machine during operation, wherein the electrical machine comprising at least one generator with a shaft, an exciter system and a drive device that drives shaft, wherein a first detector is provided, which is galvanically isolated from the electrical machine and measures a first signal, which at least indirectly describes the operating voltage across a rotor winding, and a second detector is provided, which is galvanically isolated from the electrical machine and measures a second signal, which at least indirectly describes the operating current flowing through the rotor winding, and an analysis unit is provided, which splits the first and second signals into individual frequency components and determines the impedance of the rotor winding.
Specification