Yadda ya zama da kyau a kan gwamnati na tsaro kawai tafi daga baya? Ba a tabbas cewa a kan gwamnati na tsaro kawai tafi daga mafi girma?
فیلڈ: Tattalin Aiki
China
Daga cewa Mafi yadda Annabiya na Transformer Daidai Don?
A lokacin da transformer ya yi aiki, mafi yadda, tare da kaya, abincin da kuma muhimman da suka da amfani don bincike mafi yadda da windings, suna cikin elektrik field mai girma. A kan takarda wannan elektrik field, suka samu potential mai ukuwa da ground. Idan mafi yadda ba da ground, za a cikin mafi yadda da kaya da tank, zai kasance potential difference wanda zai iya haifar da discharge mai yawa.
Kuma, a lokacin da transformer ya yi aiki, magnetic field mai girma ya cikin windings. Mafi yadda da kuma kaya, abincin, da kuma muhimman da suka da amfani don bincike mafi yadda da windings, suna cikin magnetic field mai gaba-gaba, da suka da yanayi daban-daban da windings. Saboda haka, electromotive forces da magnetic field ta shiga wa su ne da mutane, wanda ya jawo da potential differences da su daban-daban. Kafin su ne da potential differences mai yawa, suke iya kawo da insulation gaps mai yawa, kuma zai iya haifar da micro-discharges mai yawa.
Discharge mai yawa da potential differences ta haifar da shi, da kuma micro-discharges mai yawa da breakdown of tiny insulation gaps, babu wadannan da za a iya tabbatar da shi, da kuma za a iya neman wuraren da suka faru a cikin transformer.
Dalilin da ya fi kyau shine mafi yadda da kuma kaya, abincin, da kuma muhimman da suka da amfani don bincike mafi yadda da windings, suka da ground da take daidai, saboda haka suke da potential sama da ground. Grounding of the transformer core must be single-point grounding—and only single-point grounding. Saboda silicon steel laminations of the core are insulated from each other to prevent large eddy currents. Therefore, it is absolutely prohibited to ground all laminations or to implement multi-point grounding; otherwise, large eddy currents would be generated, causing severe core heating.
Typically, grounding the transformer core means grounding any one lamination of the core. Although the laminations are insulated from each other, their inter-lamination insulation resistance is quite low. Under the influence of non-uniform strong electric and magnetic fields, high-voltage charges induced in the laminations can flow through the laminations to the grounding point and then to earth, while the insulation between laminations effectively blocks eddy currents from flowing from one lamination to another. Therefore, grounding any single lamination effectively grounds the entire core.
It should be noted: the transformer core must be grounded at exactly one point—it cannot be grounded at two points, let alone multiple points—because multi-point grounding is one of the common faults in transformers.
Daga cewa Mafi yadda Annabiya na Transformer Ba Zan Iya Da Multi-Point Grounded Ba?
The reason the transformer core laminations can only be grounded at one point is that if there are two or more grounding points, a closed loop may form between these grounding points. When the main magnetic flux passes through this closed loop, circulating currents will be induced, causing internal overheating and potentially leading to accidents. Localized melting of the core can create short circuits between laminations, increasing core losses significantly and severely affecting the transformer’s performance and normal operation. In such cases, the damaged silicon steel laminations must be replaced for repair. Therefore, transformers do not allow multi-point grounding—only one and exactly one grounding point is permitted.
Multi-point grounding easily forms circulating currents and causes overheating.
During operation, the transformer core and its clamping metal parts are all subjected to a strong electric field. Electrostatic induction generates floating potentials on the core and metal parts, which may discharge to ground—an unacceptable condition. Hence, the core and its clamping parts (except for through-core bolts) must be properly and reliably grounded. However, the core is allowed only one grounding point. If there are two or more grounding points, the core, the grounding points, and the earth will form a closed loop. During operation, magnetic flux passing through this closed loop will induce so-called circulating currents, leading to localized core overheating and even burning of metal parts and insulation.
In summary: the transformer core must be grounded at only one point—it cannot be grounded at two or multiple points.
Ba da kyau kuma kara mai rubutu!
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