As we know, transformer in operation, shell, iron core and other components must be grounded, this is the use of the principle of protective grounding, when the transformer fault shell is charged, the current into the earth. But why is the core only slightly grounded?

Why the transformer core must be grounded

Transformer in operation or test, iron core and parts and other metal parts are in a strong electric field, due to electrostatic induction in the iron core or other metal structure to produce suspension potential, resulting in discharge to the ground and damage parts, this is not allowed, in addition to screw, iron core and all metal components must be reliably grounded.

Two. Why is the iron core only allowed a little grounding

If there are two points or more than two points of grounding, a closed loop is formed between the ground point. When the transformer runs, the main magnetic flux through the closed loop will generate circulation, which will cause local overheating of the iron core, burning parts and insulation, causing accidents, so only one point of grounding is allowed.

How to operate transformer core grounding?

1. The core is connected with the core clip (only one place) through the grounding piece (usually copper).

2. The clip is connected with the oil tank.

3. There is a grounding bolt in the lower tank. The user only needs to connect the grounding wire with the grounding bolt on the transformer tank reliably.