Method for monitoring the radial gap between the rotor and the stator of electric generators and device for carrying out said method
First Claim
1. A method for monitoring the radial gap (10) between the rotor (6) and the stator (8) of an electrical machine, characterized by the following steps:
- a) influencing variables (80) which govern the operating state are in each case recorded, basic measurements are carried out, and basic reference characteristic variables for the intact air gap geometry measured in the respective operating state are formed in advance for various defined operating states;
b) during subsequent operation, the size of the radial gap (10) is recorded at a number of measurement points, which are distributed around the circumference of the machine, and at least one instantaneous influencing variable (80) of the instantaneous operating state is recorded;
c) the variables (100), (80) obtained in step b) are used to form instantaneous characteristic variables (120), and the basic reference characteristic variables obtained in step a) are used to form instantaneous reference characteristic variables, which correspond to an intact air gap for the instantaneous values of the influencing variables (80);
d) at least the instantaneous characteristic variables (120) obtained in step c) are compared with the corresponding instantaneous reference characteristic variables of the radial gap; and
if at least one of the instantaneous characteristic variables (120) differs from the reference characteristic variable by more than a specified amount, a warning is produced.
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Abstract
The invention relates to a method for monitoring the radial gap (10) between the rotor (6) and the stator (8) of an electric generator (2). The aim of the invention is to provide a method that allows an especially reliable analysis of the shape of the radial gap (10) during operation of the generator (2). To this end, a measuring cycle is carried out in the stationary and balanced operating mode of the generator at defined intervals. In every measuring cycle, current parameters (120) of the radial gap (10) are determined from current marginal values (50) of the generator (2), from current influential values (80) of the generator (2) and from current measuring data (100). These parameters are used to determine and evaluate the shape of the radial gap (10) and the distance between the rotor (6) and the stator (8) by comparing them with reference parameters. The inventive method allows to better predict when repairs have to be made.
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Citations
25 Claims
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1. A method for monitoring the radial gap (10) between the rotor (6) and the stator (8) of an electrical machine, characterized by the following steps:
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a) influencing variables (80) which govern the operating state are in each case recorded, basic measurements are carried out, and basic reference characteristic variables for the intact air gap geometry measured in the respective operating state are formed in advance for various defined operating states;
b) during subsequent operation, the size of the radial gap (10) is recorded at a number of measurement points, which are distributed around the circumference of the machine, and at least one instantaneous influencing variable (80) of the instantaneous operating state is recorded;
c) the variables (100), (80) obtained in step b) are used to form instantaneous characteristic variables (120), and the basic reference characteristic variables obtained in step a) are used to form instantaneous reference characteristic variables, which correspond to an intact air gap for the instantaneous values of the influencing variables (80);
d) at least the instantaneous characteristic variables (120) obtained in step c) are compared with the corresponding instantaneous reference characteristic variables of the radial gap; and
if at least one of the instantaneous characteristic variables (120) differs from the reference characteristic variable by more than a specified amount, a warning is produced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 20)
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16. A method for monitoring the radial gap (10) between the rotor (6) and the stator (8) of an electrical generator (2), in which a measurement cycle is carried out at fixed time intervals when the generator (2) is in a steady and equilibrium operating state, in which case, during the measurement cycle:
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instantaneous influencing variables (80) of the generator (2) are recorded, instantaneous measurement data (100) are recorded for the radial gap (10) and instantaneous critical variables (50) are recorded for the generator (2), instantaneous characteristic variables (120) for the radial gap (10) are determined from the instantaneous critical variables (50) for the generator (2), from the instantaneous influencing variables (80) for the generator (2) and from the instantaneous measurement data (100) for the radial gap (10), and the shape of the radial gap (10) and the distance between the rotor (6) and the stator (8) are determined and assessed by comparing the instantaneous characteristic variables (120) for the radial gap (10) with reference values from a number of basic measurements. - View Dependent Claims (19, 21, 22, 23, 25)
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24. An apparatus (128) for monitoring the radial gap (10) between the rotor (6) and the stator (8) of an electrical generator (2), in which a number of sensors (52) are provided in order to record instantaneous critical variables (50) for the generator (2), instantaneous influencing variables (80) for the generator (2), and instantaneous measurement data (100) for the radial gap (10), in which the sensors (52) are connected, for data transmission purposes, to a processing module (70) which is provided in order to produce instantaneous characteristic variables (120) from the instantaneous critical variables (50) for the generator (2), from the instantaneous influencing variables (80) for the generator (2) and from the instantaneous measurement data (100) for the radial gap (10), with the processing module (70) being connected, for data transmission purposes, to an analysis module (126), in which case the analysis module (126) can control a measurement cycle for analysis of the shape of the radial gap (10) and for monitoring the distance between the rotor (6) and the stator (8).
Specification