AMP measuring principle with superimposed asymmetry measurement. Fault indications according to the AMP measuring principle are displayed via ALARM2, fault indications according to the asymmetry measurement are displayed via ALARM1.

• 安培测量原理与叠加不对称测量.；据安培的故障迹象显示测量原理经警报2；根据对称性故障迹象显示经测量警报1