21. The point where the AC line voltage is 0 V is the " Zero Cross Point ". 22. In this configuration, output currents are in phase with line voltages to produce a unity power factor. 23. They used motor-generator sets to rectify the alternating current line voltage into direct current for their traction motors. 24. An AFCI does not detect high line voltage due to an open neutral in a multiwire branch circuit. 25. These are often used in repair shops for testing devices under different voltages or to simulate abnormal line voltages . 26. The torque is thus proportional to the instantaneous line voltage times the instantaneous load current, automatically correcting for power factor. 27. For instance, there will almost always be a brief decrease in line voltage , which will signal a potential fault condition. 28. In Europe, and most 220-240 V territories, the line voltage is sufficient to start lamps over 20W with a series inductor. 29. Conversely, VAR compensation is possible in a similar configuration where output currents lead line voltages to improve the overall power factor. 30. This relationship results in greater acceleration energy to a higher motor speed and less disturbance at changeover to full line voltage .
