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首页> 外文期刊>Electric Power Components and Systems >Discrimination of Inrush, Internal, and External Fault in Power Transformer Using Phasor Angle Comparison and Biased Differential Principle
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Discrimination of Inrush, Internal, and External Fault in Power Transformer Using Phasor Angle Comparison and Biased Differential Principle

机译：用相角比较和偏微分原理判别电力变压器的涌入，内部和外部故障

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摘要

Conventional protection scheme of power transformer maloperation during abnormalities such as inrush condition, current transformer (CT) saturation during external fault and high resistance internal fault conditions. This article presents inrush detection based on an average angle of 2(nd) order derivative of differential current. The magnitude and phase angle of primary and secondary currents are estimated using a Modified Full Cycle Discrete Fourier Transform (MFCDFT) algorithm. Normally, during an internal fault, the differential current is well above the restraining current; however, the same condition arises during external fault with heavy CT saturation. Hence, a phase angle comparison based scheme is combined with percentage biased differential protection. During an internal fault, the phase angle difference of primary and secondary current is 90 degrees, whereas it differs 90 degrees for any external fault conditions. In the proposed scheme, 315 MVA, 400/220kV transformer is considered for validation of various fault conditions simulated in PSCAD software. Moreover, the proposed scheme is validated on developed laboratory prototype of 2 kVA, 230/115 V single phase transformer using ATmega328 microcontroller. The proposed algorithm is effectively validated on both, simulation and hardware to discriminate inrush, internal and external fault by considering various system and fault parameters.
机译：电力变压器在异常情况下的常规保护方案，例如涌入情况，外部故障期间的电流互感器（CT）饱和以及高电阻内部故障情况。本文介绍了基于差动电流的二阶二阶导数平均角的浪涌检测。使用改进的全周期离散傅立叶变换（MFCDFT）算法估算一次和二次电流的大小和相位角。通常，在内部故障期间，差动电流远高于限制电流。但是，在外部故障中CT饱和度很高时，也会出现相同的情况。因此，将基于相角比较的方案与百分比偏置差动保护结合在一起。在内部故障期间，一次和二次电流的相角差小于90度，而在任何外部故障条件下相角差均大于90度。在建议的方案中，考虑使用315 MVA，400 / 220kV变压器来验证PSCAD软件中模拟的各种故障条件。此外，该方案在使用ATmega328微控制器的2 kVA，230/115 V单相变压器的开发实验室原型上得到了验证。通过考虑各种系统和故障参数，该算法在仿真和硬件上均得到了有效验证，可以区分浪涌，内部和外部故障。

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