| 摘要 |
The location of an electrical disturbance, e.g. a short or open circuit or lightning strike, in an electrical system comprising one power supply 20 and several distribution legs 1, 2, ¦.., N, is determined from the relative phase of current and voltage waveforms across an inductance L1, L2, ¦., LN of a portion of a circuit. If the current leads the voltage, then the fault is on that leg of the system. If the current lags the voltage, then the fault is on another leg. The relative phase of the current and voltage waveforms across the inductance may be determined by calculating the sign (positive or negative) of the inductance, using a controller 30 that measures both current and voltage. If a fault is detected, the controller may open an isolating switch 40 to shut down that leg whilst leaving other legs operational. The electrical system may be on an aircraft. |
