Precision Transformer Core, the core is the main part of the magnetic circuit in the transformer. It is usually composed of hot-rolled or cold-rolled silicon steel sheets with high silicon content and coated with insulating paint. The iron core and the coil wound on it form a complete electromagnetic induction system. The amount of power transmitted by a power transformer depends on the material and cross-sectional area of the iron core.
(1) A separate ground lead wire for the iron yoke clip is provided. Because the iron core hits the upper clip and causes a multi-point grounding fault, the grounding current only flows inside the iron core clip and no current flows in the iron core grounding lead wire, which will cause the staff to mistakenly believe that the iron core has not failed; After setting, no matter where the iron core hits the clip, a loop will be formed through the two grounding outer leads, so that the grounding current can be correctly detected externally.
(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 insulating bolt of the yoke is drawn and the location of the fault grounding point, the maximum induced voltage of the loop is only 1/4 of the turn voltage, and the maximum grounding current at this time is only about a few amperes, which is more than the iron core. The ground lug is much smaller when placed elsewhere.
(3) If it is necessary to place the iron core grounding sheet in other positions due to the inconvenience of on-site installation, the insulating bolts of the iron yoke pull strap and the grounding sheet should also be placed diagonally, which can prevent the generation of large current.