可变阻抗有载分接开关变压器的建模及其应用

Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137) Pub Date : 1998-03-03 DOI:10.1109/EMPD.1998.702713

Jiangwei Fan, Z. Bo

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引用次数: 13

摘要

在电力系统故障分析中，有载分接开关变压器通常用其标称分接位置的漏阻抗来表示。然而，OLTCT的工作位置偏离其标称位置，由于不同的匝比，导致实际阻抗与其标称值不同。变压器阻抗的变化引起故障计算误差，影响数值保护继电器的整定和断路器额定值的选择。为了提高有载分接开关变压器故障计算的准确性，提出了一种新的有载分接开关变压器故障计算模型。

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Modelling of on-load tap-changer transformer with variable impedance and its applications

In power system fault analysis, an on-load tap-changer transformer is normally presented in terms of its leakage impedance at nominal tap position. However the operational position of an OLTCT is deviated from its nominal position, resulting in the actual impedance differing from its nominal value due to the different turns ratio. The variation of transformer impedance introduces error in fault calculations which may affect the setting of numerical protection relays and the selection of circuit breaker rating. This paper presents a new model of an on-load tap changer transformer to improve the accuracy of fault calculation.

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Proceedings of EMPD '98. 1998 International Conference on Energy Management and Power Delivery (Cat. No.98EX137)

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