... Zero Sequence Current Transformer Voltage Grade: 0.38kv-66kv Grid Frequency:50Hz Ambient Temperature: -10 - 60 c Zero Sequence Current Transformer1. ... poured by resin. With beautiful appearance, good hermeticness, high insulation, high sensitivitym, good linearity, easy installation and wide application, ... suprression coil.)MRD-L series zero-sequence CT core is made of ZH120-130 cold rolled silicon ...