This conceptual circuit can detect both phase sequences

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Other Materials from the Main Document

• Article «Phase-sequence indicator uses few passive components»
• Figure 1. This conceptual circuit can detect both phase sequences
• Figure 2. When the voltages across R₁ and C₂ are equal, V_C1 = -V_R2, V_C1 + V_R1 = V_S1, and V_C2 + V_R2 = V_S2
• Figure 3. This phase-indicator circuit balances branch voltages and currents and requires no ground reference. These component values are for a 60-Hz line frequency
• Figure 4. I₃ has half the magnitude and an exactly opposite direction to (I₁+ I₂) in Figure 3