突然损失发电机或线路：sudden loss of a generator or transmission line.
负荷突然增加或减少：sudden load increases or decreases
短路和开关操作：short circuits and switching operations.
三相和对地短路：three-phase and line-to-ground faults
短路器：circuit breaker
暂态过电压和电流：transient overvoltages and currents
雷击：lightning strikes
电涌放电器：surge arrester
相量：phasor，通常用复数phasors
瞬时功率：instantaneous power
特别地：In particular,
正弦电压或电流：A sinusoidal voltage or current at constant frequency
最大值：maximum value
有效值：effective value
平均值：average value
坐标系实轴：real axis
坐标系虚轴：imaginary axis
相量图：phasor diagram for …
无源元件：passive elements
电阻、电感、电容、电抗：resistor, inductor, and capacitor, reactance,
感性、容性：inductive, capacitivereactive power什么意思
有功功率：real power or active power
无功功率：reactive power
功率因数：power factor
功率因数角：power factor angle
A single-phase source delivers 100kW to a load operating at a power factor of 0.8 lagging.

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