| 摘要 |
<p>The compensation required can be derived in real time, by rapid sampling, digitising (16,20) the current and voltage measurements. The signal period, active and reactive power are memorised (28), over a predetermined time. During this time, the sum of the squares of voltage are determined (22) and a value for phase angle proposed. A quoted formula provides the capacity required for compensation (26). The formula relates the number of samples taken over the predetermined time and the time interval between two samples. Also the phase angle and active and reactive power samples, together with a constant. The compensation capacity required may be determined by varying the entered phase angle proposed. Current measurement (14) may be by clip on clamp ammeter and combined voltmeter (18), with a microprocessor (24).</p> |
