Calculation of Composite Short-circuit Impedance and Circulating Current of Multi-winding Transformer

doi:10.11985/2023.04.028

Abstract

Abstract:

In order to solve the problems of complex modeling of multi-winding transformer, difficult calculation of composite short-circuit impedance and circulating current, and long calculation time, a calculation method based on simplified transformer finite element model is proposed. This method can quickly and accurately calculate the composite short-circuit impedance and the corresponding short-circuit circulating current of the multi-winding transformer. Firstly, a simplified finite element model of the transformer is established, and the inductance matrix of the winding is obtained. Then, the relevant data are input into the calculation software for calculation to obtain the composite short-circuit impedance and the corresponding short-circuit circulation of the multi-winding transformer. In order to verify the accuracy of the calculation method, an example is verified. The results show that the method has high calculation accuracy and less time-consuming. By using this calculation method based on the simplified finite element model of the transformer, the difficulties in the calculation of the composite short-circuit impedance and circulating current of the multi-winding transformer can be effectively solved, which not only improves the calculation efficiency, but also provides accurate calculation results and has good engineering application value.

Key words: Multi-winding transformers, composite short-circuit impedance, short-circuit circulating current, finite element model

CLC Number:

TM315

LI Shijun, HUANG Chao, XIA Xiangbin, YANG Jiayi, KUANG Xiaowei, ZHANG Bin, CHEN Yiyuan, GUO Ying. Calculation of Composite Short-circuit Impedance and Circulating Current of Multi-winding Transformer[J]. Journal of Electrical Engineering, 2023, 18(4): 260-267.

Figures/Tables 7

References 21

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参数	高压绕组	低压绕组
额定容量/(kV·A)	5 280	4×1 320
额定电压/V	25 000	4×970
额定电流/A	211	1 361
最大电流/A	235	1 512
短路阻抗(%)	37	35
匝数	1 907	74

	短路电流/A								短路阻抗(%)		误差(%)
	H1	H2	H3	H4	L1	L2	L3	L4	计算值	实测值	误差(%)
H-L1	-157.47	438.48	-94.16	-87.85	-1 167.12	0	0	0	35.53	36.62	3.06
H-L2	-101.82	372.76	-83.1	-88.84	0	-1 167.12	0	0	35.64	36.7	2.97
H-L3	-94.16	-87.85	-157.47	438.48	0	0	-1 167.12	0	35.53	36.05	1.46
H-L4	-83.1	-88.84	-101.82	372.76	0	0	0	-1 167.12	35.64	36.25	1.71
H-L	-436.3	634.3	-436.31	634.3	-1 162.76	-1 171.47	-1 162.77	-1 171.47	36.56	37.52	2.62
L1-L2	0	0	0	0	1 166.9	-1 166.9	0	0	77.19	78.45	1.63
L1-L3	0	0	0	0	1 166.9	0	-1 166.9	0	76.43	77.16	0.94
L1-L4	0	0	0	0	1 166.9	0	0	-1 166.9	76.10	77.98	2.47
L2-L3	0	0	0	0	0	1166.9	-1 166.9	0	76.10	77.86	2.31
L2-L4	0	0	0	0	0	1 166.9	0	-1 166.9	77.19	76.95	-0.69
L3-L4	0	0	0	0	0	0	1166.9	-1 166.9	77.19	78.12	1.20

计算方法		H1	H2	H3	H4	L1	L2
H-L1	本文方法	-51.53	-1.88	0.12	-0.32	1 360	0
	场路耦合方法	-52.42	-2.21	1.01	-0.83	1 361	0
	数学计算方法	-51.04	-1.80	0.06	-0.26	1 360	0
L1-L2	本文方法	49.63	-49.33	-0.63	0.46	-1 363	1 361
	场路耦合方法	50.89	-51.00	-2.17	1.92	-1 364.0	1 361
	数学计算方法	49.42	-49.24	-0.480	0.35	-1 361.5	1 361