例如，电弧炉就是一种非线性负荷，因为加上正弦电压后，它将形成非正弦电流(大量谐波)。
For example, an arc furnace is nonlinear since it will draw a no sinusoidal current (rich in harmonic's) when a sinusoidal voltage is applied.
由于电弧电阻非线性、时变性、高阻的特点，使得常规原理馈线保护中的阻抗保护、电流速断保护往往不能正确动作。
For the arc resistance is nonlinear and high, the conventional feeder protections, such as impedance protection and current protection, maybe fail to trip off.
电弧炉具有低电压、大电流而且负荷非线性的特点，在其运行过程中产生大量的负序电流，导致电网不稳定。
The characteristics of arc furnace are low voltage, big current and nonlinear load. Much negative sequence current is produced during running. As a result, the power net is unstable.
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