Why is the transformer core grounded

1. Why is the core of a transformer grounded?

If the core of a transformer is not grounded, an induced voltage will be generated on the core and other components. Furthermore, if an external voltage is applied and this induced voltage exceeds the breakdown voltage to ground, internal discharge will occur within the transformer. This can damage the transformer and poses a significant safety hazard. Therefore, the core must be grounded to prevent this phenomenon.

2. What is the purpose of the shading ring embedded in the iron core of an AC contactor?

The shading ring embedded in the iron core of an AC contactor serves the following purposes:

• Function 1: Reduces the noise generated by the current in the coil.

• Function 2: Eliminates residual magnetism in the core, allowing the contactor to rapidly release its magnetic energy when powered off. (Note: The phrase "软泥怪" in the original text appears to be a typo or speech-to-text error for "使得" or "确保". The translation here reflects the correct technical meaning.)

• Function 3: Eliminates interference, ensuring a smoother magnetic attraction action and preventing vibrations.