Why Should Transformer Core be Grounded? Why can’t it be Multi-grounded?

20Dec

Why Should Transformer Core be Grounded? Why can’t it be Multi-grounded?

 

Why Should Transformer Core be Grounded? Why can’t it be Multi-grounded?

The iron core and other accessories of the transformer in operation are in the electric field around the winding, such as not grounded, the iron core and other accessories must induce a certain voltage, under the action of the external voltage, when the induction voltage exceeds the discharge voltage to the ground, it will produce discharge phenomenon. To avoid internal discharge of the transformer, the iron core should be grounded.

Multi-point grounding is easy to form circulation, easy to heat.
Transformer in operation process, the core and clip pieces of metal parts, etc in a strong electric field, because of the electrostatic induction can produce suspended potential on the iron core and metal parts, and the potential of discharge, this, of course, is no good, so, such as pieces of iron core and its holder must be correct and reliable grounding (except only wear heart bolt). The core can only be grounded at one point. If there are two or more points, the core will form a closed loop with the ground point and the earth. When the transformer is in operation, magnetic flux will pass through the closed loop, which will produce so-called circulation, causing local overheating of the core, and even burning metal parts and insulating layers.

Why Should Transformer Core be Grounded? Why can’t it be Multi-grounded?


The iron core and other accessories of the transformer in operation are in the electric field around the winding, such as not grounded, the iron core and other accessories must induce a certain voltage, under the action of the external voltage, when the induction voltage exceeds the discharge voltage to the ground, it will produce discharge phenomenon. To avoid internal discharge of the transformer, the iron core should be grounded.


Multi-point grounding is easy to form circulation, easy to heat.

Transformer in operation process, the core and clip pieces of metal parts, etc in a strong electric field, because of the electrostatic induction can produce suspended potential on the iron core and metal parts, and the potential of discharge, this, of course, is no good, so, such as pieces of iron core and its holder must be correct and reliable grounding (except only wear heart bolt). The core can only be grounded at one point. If there are two or more points, the core will form a closed loop with the ground point and the earth. When the transformer is in operation, magnetic flux will pass through the closed loop, which will produce so-called circulation, causing local overheating of the core, and even burning metal parts and insulating layers.