| 摘要 |
An apparatus for reducing the current in the neutral conductor of an electrical two- or three-phase system comprises: means (21, 22, 23) for measuring the voltage or current of each phase; means (35) for measuring the current in the neutral conductor; multiplying means (31, 32, 33) for multiplying the phase voltage or current of each phase by the current in the neutral conductor; means (42) for feeding back the product of the phase voltage and the current to the load in a negative feedback loop. Said apparatus may also comprise: interface means (21, 22, 23) for converting the measured phase voltages or currents and the neutral current into control signals; and means (107, 109) for normalizing the output of said multiplying means by low-pass filtering. A method for reducing the neutral current is also disclosed. |
