Study on Distribution Transformer Product Quality Supervision Spot Check Results and Accurate Measurement of Loss

doi:10.16628/j.cnki.2095-8188.2020.07.016

Abstract

Abstract:

According to the results of spot checks by state supervision of 2017~2019 distribution transformer product quality, for the main quality defects of examination results in recent years, this paper discussed the measurement of no-load loss and load loss parameters in the lowest qualified rate project.Through the study of the loss measuring system error basic source and the uncertainty degree of measuring results, the paper analyzed the key technology affecting the accurate maesurement of loss, the result compliance control and the evaluation of the uncertainty to provide reference for distribution transformer design and quality control.

Key words: distribution transformer, measurement parameters, basic source of measurement error, accurate measurement of loss

CLC Number:

TM56

MA Guifen, YUAN Xiaoxian, JIANG Hai, DONG Shi. Study on Distribution Transformer Product Quality Supervision Spot Check Results and Accurate Measurement of Loss[J]. LOW VOLTAGE APPARATUS, 2020, 592(7): 91-95.

Figures/Tables 6

不确定度来源	类型	误差量 (或不确定度)/%	分布系数	标准不确定度 u(x_i)/%	灵敏系数c_i	不确定度贡献 u_i(y)= $c i$ u(x_i) /%
电流互感器变比误差	B	±0.20	k= $3$	0.115 5	1	0.115 5
功率测量	B	±0.50	k= $3$	0.288 7	1	0.288 7
相角误差	B	1.46	k= $3$	0.843 0	1	0.843 0
电流测量	B	±0.50	k= $3$	0.288 7	2	0.288 7
电压测量	B	±0.50	k= $3$	0.288 7	1	0.288 7
合成标准不确定度 $u = ∑ i (u i) 2$						0.97
包含因子k					2
扩展不确定度U=ku_c						1.97%

不确定度来源	类型	误差量 (或不确定度)/%	分布系数	标准不确定度 u(x_i)	灵敏系数c_i	不确定度贡献 u_i(y)= $c i$ u(x_i) /%
电阻测量仪	B	±0.50	k= $3$	0.288 7	1	0.288 7
功率测量	B	1.97	k= $3$	1.137 4	1	1.137 4
温度测量仪	B	1.00	k= $3$	0.577 4	1	0.577 4
电流测量	B	±0.50	k= $3$	0.288 7	2	0.577 4
合成标准不确定度 $u = ∑ i (u i) 2$						1.43
包含因子k					2
扩展不确定度U=ku_c						2.90

References 9

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年份	抽查产品数/批次	合格产品数/批次	产品抽样合格率/%
2017	48	45	93.8
2018	107	89	83.2
2019	120	105	87.5

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