Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

inductance

Since the primary winding of the zero-sequence current transformer is the neutral of the three-phase star connection. Under normal conditions, the sum of the three-phase currents is equal to zero, the neutral line (primary winding) has no current, no magnetic flux is generated in the iron core of the transformer, and no induced current is present in the secondary winding. When a single-phase earth fault occurs on the protected equipment or system, the sum of the three-phase currents is no longer equal to zero, and the primary winding will flow a current equal to three times the zero-sequence current of each phase. At this time, the magnetic flux is generated in the iron core. The secondary winding will induce current.