Grounding point of iron transformer core
1. The iron transformer core is separately provided with a grounding lead wire for the iron yoke clamp. Because if the iron core hits the upper clamp and causes multiple ground faults, the ground current only flows inside the core clamp, and no current flows through the core ground lead, which may cause the staff to mistake the core for failure; After setting, no matter where the iron core hits the clip, it will form a loop through two grounding outer leads, so that the ground current can be detected correctly on the outside.
2. The iron core grounding piece is placed in the middle of the cross section of the iron yoke. In this way, no matter where the iron yoke pulls the insulating bolt and where the fault grounding point is, the large induced voltage of the loop is only 1/4 of the 匝 voltage. At this time, the ground current is only a few amps, which is grounded compared with the iron core. The film is much smaller when placed in other locations.
3. If it is necessary to place the core grounding piece in other positions due to problems such as inconvenient installation on site, the insulating bolt of the yoke pull strap and the grounding lug should be placed diagonally to prevent large currents from being generated.