If measurement circuit detects incorrect phase sequence for longer than one time period, the meter records wrong phase sequence condition as event. The same algorithm also applies to detection of correct phase sequence, which means that correct phase sequence must also be present for longer then defined period in order to detect it.
If the capacitor were to be replaced by a resistor of equal value to the lamps’ resistance, the two lamps would glow at equal brightness, the circuit is balanced. However, the capacitor introduces a phase shift between voltage and current in the third leg of the circuit equal to 90°.
However, the capacitor introduces a phase shift between voltage and current in the third leg of the circuit equal to 90°. This phase shift, greater than 0° but less than 120°, skews the voltage and current values across the two lamps according to their phase shifts relative to phase 3.
For an accurate reading, it may be necessary to remove and test the suspect capacitor separately. Remember, it’s important to use the ESR meter to test all suspect capacitors, regardless of their physical appearance, as capacitors may not always exhibit visible signs of degradation. Below are examples of some common ESR meters.
Magnitudes of the various currents and component voltages in balanced systems are not affected by a reversal of phase sequence. If the phase sequence of the applied voltages is reversed in an unbalanced system, certain branch currents change in magnitudes as well as in time phase, although the total watts and vars generated remain the same.
You cannot check phase sequence with a phase rotation tester. Phase sequence is not a property of the origin, it is something checked throughout the whole installation. DNO meters are only in calibration if the rotation is correct. If the rotation is incorrect there is probably crossed tails between the meter and main switch.