Method for state monitoring and early fault warning of stator core of ship generator

Abstract

The invention discloses a method for state monitoring and early fault warning of a stator core of a ship generator. The method comprises the steps of (1) establishing a ransient state temperature rise mathematic model based on temperature rise, a generator structure and operation parameters of the stator core of the ship generator; (2) acquiring data of the generator in operation and using the data as sample data when the working condition of the ship generator changes, and applying a least square method to perform parameter identification on the established transient state temperature rise mathematic model; and (3) comprehensively judging a generator state by means of dynamic judgment and static judgment methods and achieving early warning of generator faults. Parameters of the transient state temperature rise mathematic model in the method reflect a technical state of the generator, the system parameter change situation is obtained by identifying a core temperature model in real time and is comprehensively judged with a rated temperature rise difference, the generator state can be accurately judged, and the early fault warning of the stator core of the generator is achieved.

Description

technical field [0001] The invention relates to the monitoring of the state of a generator, in particular to a method for state monitoring and fault early warning of a stator core of a marine generator. Background technique [0002] The generator is a kind of electromechanical energy conversion mechanism. In the process of energy conversion, losses are inevitably generated. Most of these losses eventually turn into heat. The cooling medium will take part of them away, and the rest will increase the temperature of various parts of the motor. . Generator losses can be divided into three categories: core loss, winding loss and mechanical loss according to the generated parts. The stator core loss and winding loss account for a considerable proportion of the entire motor loss. Motor overload operation, asymmetrical operation, cooling system failure, iron core failure, insulation failure, etc. will cause overheating of the stator core of the motor and increase its temperature r...

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned idea has three deficiencies. One is: the threshold value set by the temperature rise is set arbitrarily, and the threshold value of different generators and different motor parts is not the same, and the setting of the threshold value is not scientific.

The second is: the temperature rise of the stator core is related to many structural parameters of the generator. The influence of fluctuations in different parameters on the temperature rise of the core can offset each other. Simply comparing the temperature measured by the sensor with the calculated standard value can only preliminarily determine the power generation. machine state

Does not consider the change of structural parameters of the generator in this state

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