A Coupling Network Generation Method for Loss and Temperature Rise of Water Internally Cooled Stator Transposition Winding

Abstract

A coupling network generation method for loss and temperature rise of water internally cooled stator transposition windings of the present invention relates to the field of coupling networks between electrical and thermal networks in turbogenerators, the purpose of which is to overcome the existing problem of obtaining the temperature of braided transposition strands The calculation result of the method has a large error and the data is not accurate enough. The specific steps of the method are as follows: Step 1. Discrete the water-cooled stator transposition winding along the motor axis into multiple two-dimensional winding sections; Step 2. Divide each The winding section is discretized into multiple solid nodes and fluid nodes. Step 3. Calculate the resistance, reactance and thermal conductance at the first temperature; Step 4. Calculate the current and eddy current of each solid node according to the resistance and reactance; Step 5 , Calculate the loss of each solid node, and calculate the second temperature of each solid node and the temperature of the fluid node; Step 6, compare the second temperature with the first temperature, and generate the final water-cooled stator transposition winding Coupling network for loss and temperature rise.

Description

technical field [0001] The invention relates to the field of coupling networks of electrical and thermal networks in turbogenerators. Background technique [0002] The additional losses caused by eddy currents and circulating currents in the stator windings of large-capacity nuclear power turbogenerators are very large. In order to reduce the additional losses, the strands in the stator bars usually adopt a braided transposition structure. In addition, the temperature rise distribution caused by loss will seriously affect the life of the insulation, and even cause breakdown of the insulation due to local overheating. Safe and stable operation. [0003] It is a challenge to calculate the temperature rise of the stator strands with a complex braided transposition structure. The existing methods for obtaining the strand temperature do not consider the braided transposition of the strands nor the electromagnetic-thermal coupling, which leads to large errors in the calculation r...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coupling network generation method for the loss and temperature rise of the transposition winding of the water internally cooled stator in order to overcome the problems that the existing method for obtaining the temperature of the braided transposition strands has a large error in the calculation results and the data is not accurate enough

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