duval五边形变压器故障诊断matlab代码

Duval五边形变压器故障诊断是一种常用的变压器故障诊断方法，它基于变压器的电流和电压波形特征进行分析。下面是一个简单的Duval五边形变压器故障诊断的Matlab代码示例：

% 导入变压器电流和电压数据
current = importdata('current_data.txt');
voltage = importdata('voltage_data.txt');

% 计算电流和电压的幅值和相位角
current_amplitude = abs(current);
current_phase = angle(current);
voltage_amplitude = abs(voltage);
voltage_phase = angle(voltage);

% 计算Duval五边形的各个顶点坐标
A = current_amplitude .* exp(1i * current_phase);
B = voltage_amplitude .* exp(1i * voltage_phase);
C = current_amplitude .* exp(1i * (current_phase - pi/2));
D = voltage_amplitude .* exp(1i * (voltage_phase - pi/2));
E = current_amplitude .* exp(1i * (current_phase + pi/2));

% 绘制Duval五边形
figure;
plot(real(A), imag(A), 'ro'); hold on;
plot(real(B), imag(B), 'go');
plot(real(C), imag(C), 'bo');
plot(real(D), imag(D), 'yo');
plot(real(E), imag(E), 'mo');
xlabel('Real');
ylabel('Imaginary');
title('Duval Pentagon');
legend('A', 'B', 'C', 'D', 'E');

% 判断故障类型
fault_type = '';
if abs(A-B) < abs(B-C)
    fault_type = '短路故障';
elseif abs(A-B) > abs(B-C)
    fault_type = '开路故障';
else
    fault_type = '正常';
end

disp(['故障类型：', fault_type]);

请注意，上述代码仅为示例，实际应用中需要根据具体的数据和故障判断规则进行相应的修改和优化。