Why does the transformer core must be slightly ground？
Why does the transformer core must be slightly ground？
As one of the core equipment of power transmission, the grounding mode of the transformer core is the key link to ensure the safe and stable operation of the power system, and the core must strictly follow the principle of grounding, the reasons are as follows.
Inhalt
1. Multi-point grounding: the “culprit” of the working magnetic flux short-circuit turns
The transformer relies on the principle of electromagnetic induction to work, and when the normal magnetic flux is conducted in the iron heart according to the established route. If there is a multi-point grounding, just like the random addition of roadblocks on the traffic arteries, the short circuit turns will instantly form around the core working flux. These short-circuit turns seriously disrupt the magnetic flux path, resulting in a rapid increase in the local magnetic flux, like the circuit overload, and then cause the sharp overheating of the core. Overheating will directly erode the insulation of the winding. Once the insulation “defense line” is broken, short circuit accidents will come one after another, resulting in instantaneous paralysis of power transmission, factory shutdown, residential power interruption and many other serious consequences.
2. Excess grounding: a “catalyst” for internal core circulation and loss
When the excess grounding in the transformer center, the potential difference between different locations is like an “electric trap” in the dark. Under its influence, the iron heart section will give birth to the circulation, just like no reason in the iron heart internal blowing “electric whirlwind”. These cycles continue to consume electricity, making the core loss geomeentially. Not only that, the heat generated by the circulation makes the core temperature continue to climb, and the operation efficiency of the transformer is greatly reduced, just more difficult for the walker of heavy climbing. In the long run, the core material performance degradation, the service life is sharply shortened, an originally reliable transformer premature “aging”.
3. Ground strip fuse: the “fuse” of suspension potential accident
Multi-point grounding is easy to cause a large current. Once the current exceeds the upper limit of the grounding pad, the grounding pad will be overwhelmed and fuse. At this point, the original solid grounding of the part instantly lost the “foundation”, forming a dangerous suspension potential. This suspended potential is like a hidden “electric bomb”, at any time in the center and the surrounding parts detonated discharge phenomenon. A strong discharge is like a sharp blade, mercilessly tear the insulation layer, electrical accidents are on the trigger, the whole power system instantly into a crisis situation.
(2)工学的な範囲:(0.3~0.5)X_L@fᵣ
To sum up, the series of problems caused by multi-point grounding—working magnetic flux short circuit turn, the core section circulation loss increase and suspension potential danger, each of which is enough to cause a fatal blow to the transformer. In order to ensure the smooth operation of the power system, so that the transformer efficiently and safely shoulder the responsibility of power conversion, the core must strictly implement the grounding rules to protect the “lifeline” of power supply.
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