Transformer Strong Guidance Oil Fluid Flow and Heat Transfer Analysis

doi:10.11985/2015.12.009

Abstract

Abstract:

According to the principle of fluid mechanics to calculate the fluid field of the oil guide winding, according to the vertical, horizontal oil flow speed and the convective heat transfer coefficient and the winding temperature rise. According to the different winding resistance characteristic of the structure, adjust the traffic distribution between each winding, fully rational utilization of traffic, and match the winding loss and heat load density, make different winding temperature rise distribution, moderate control oil flow rate at the same time, avoid the happening of oil flow static electricity. Finally, the resistance characteristics of the whole cooling system were analyzed, and determine whether the capacity of the cooler and pump performance meet the requirements.

Key words: Strong guidance transformer, oil fluid flow and heat transfer analysis

CLC Number:

TM451

Zuoliu Huang. Transformer Strong Guidance Oil Fluid Flow and Heat Transfer Analysis[J]. Journal of Electrical Engineering, 2015, 10(12): 50-57.

Figures/Tables 12

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References 6

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绕组类型	入口处油平均流速 /(m/s)	散热密度 /(W/m2)	平均温升计算值/K	平均温升测量值/K	误差 (%)
高压绕组	0.13	987	55.4	56.1	-1.2
中压绕组	0.15	1337	56.1	58.5	-4.1
低压绕组	0.16	—	—	—	—

项目	计算值	实测值	计算误差(%)
高压绕组平均温升/K	49.7	50.0	-0.6
中压绕组平均温升/K	53.6	51.5	4.0
顶层油温升/K	34.0	35.1	-3.0

项目	原方案		新方案
项目	高压	低压	高压	低压
入口流速/(m/s)	0.43	0.44	0.44	0.41
散热密度/(W/m2)	2477	1014	2477	1014
绕组平均温升/K	63.5	44.8	61.7	43.9
绕组热点温升/K	83.7	55.6	74.0	52.5

管截面形状	R/d	转角度数α
管截面形状	R/d	30	45	60	90
圆形（管内径d）	0.5	0.12	0.27	0.48	1.0
	1.0	0.058	0.1	0.15	0.246
	2.0	0.066	0.089	0.112	0.159