On-line fault diagnoses method on rotor winding inter turn short-circuit of turbine generator

Abstract

This invention relates to one gas wheel motor rotor coil shortcut online test method in the test technique field, which comprises the following steps: through online real time collecting motor electrical parameter data and according to one certain work situation motor electrical parameter data to compute normal current theory values by reverse rotor normal current; then computing excitation magnetic current real value and theory value relative bias; the bias difference is as generation motor set to judge whether there is coil short cut fault as dialogue of the shortcut fault.

Description

technical field [0001] The invention relates to a method capable of diagnosing on-line whether there is an inter-turn short-circuit fault in the rotor winding of a turbogenerator, and belongs to the technical field of testing. Background technique [0002] Turn-to-turn short-circuit of rotor winding is a relatively common generator fault. Turn-to-turn short-circuit fault is likely to cause local overheating, and finally lead to rotor ground fault. In addition, inter-turn short circuits cause uneven rotor heating, rotor bending and unbalanced magnetic pull, all of which can also cause increased motor vibration. Since the inter-turn short circuit of the rotor winding has little influence on the normal operation of the unit or the fault characteristics are not obvious at the initial stage, it is often easily overlooked. However, as time increases, many inter-turn short circuit faults will further develop, and the rotor winding is grounded, resulting in malignant Therefore, it ...

AI Technical Summary

Problems solved by technology

The disadvantage of the differential coil dynamic measurement method is that it can only be carried out when the generator is no-load or three-phase short-circuited, and the measurement requires the rotor to be in a rotating state, and the installation of this coil requires a long downtime

The disadvantage of the single-opening transformer method and the double-opening transformer method is that neither of them can be applied to the detection in the rotating state, and it can only be carried out after the rotor is pulled out after the machine is shut down.

[0010] (4) AC impedance and power loss method

[0016] Most of these traditional detection methods are not on-line detection or are greatly interfered by other factors, so the results obtained in the actual test are not very ideal, and the detection sensitivity is not high

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