Ko da Turuwa da Kulaɗi Masana'antu na Kirkiro Tsari da Turanci?

I. Harsuna Tsohon Iyali na Fasahar Tsari

• Fasahar tsari (VT) zai iya tafiye da yake a matsayin shi a kan lokacin da ya haɗa, amma ba zan iya kusa haka a kan muhimman lokaci ba.

• Siffofin duka na fasahar tsari ta bayar wurare masu inganci, wanda yana ƙara a gaba da adadin karamin siffofin duka. Saboda haka, zama da ci abubuwa a kan siffofin duka da siffofin duka, wanda yana nufin cewa VT ya tafiye a kan lokacin da ya haɗa a kan lokacin da ya haɗa.

• A lokacin da ake amfani da fasahar tsari, ba zan iya kasa siffofin duka na fasahar tsari ba.

• Don fasahar tsari da suka haɗa da 60 kV ko kadan, zai iya samun fuses a siffofin duka don in kula aiki da ake yi. Don fasahar tsari da suka haɗa da 110 kV ko daidai, ba zan iya samun fuses a siffofin duka saboda yawan aikinsu ce ta kasance da ainihi da ake yi, kuma yadda ake buƙata fuses a wannan muhimman lokacin da ke gaba ce ita ce.

• Zaman lafiya na fasahar tsari ba zan iya kusa da 110% na zaman lafiya na shi.

• Don alaƙar mutuwa, maimakon wahar siffofin duka ko neutral point na fasahar tsari zai iya samun grounding don in kula ci abubuwa daga siffofin duka a lokacin da akwai yanayin a siffofin duka, wanda zai iya haifar da mutane da wurare. Idan ake yi aiki a kan fasahar tsari ko takamta, ba zan iya kasa siffofin duka kawai, amma kuma zai iya samun disconnection point a siffofin duka don in kula ci abubuwa daga fasahar tsari masu aiki a kan siffofin duka, wanda zai iya haifar da tsari a siffofin duka.

• Idan ake fara aiki a kan fasahar tsari, tabbatar da cewa insulation ya fi shi, phasing ya fi shi, oil level ya fi shi, da kuma connections ya fi shi. Idan ake rufe fasahar tsari, koyar da protective relays da automatic devices, kasa secondary automatic circuit breaker ko remove secondary fuses, sannan kasa primary disconnect switch don in kula ci abubuwa daga back-charging. Rukunsa lokacin da energy metering circuits ya rufe.

II. Aiki na Fasahar Tsari

Bayan an kammala preparations, mai aiki zai iya yi aiki da fasahar tsari: install high- and low-voltage fuses, close output disconnect switch don in bazu fasahar tsari, sannan bazu relays da automatic devices da fasahar tsari ta bayar.

Paralleling VTs a Double Busbar Systems: A double busbar configuration, har daidai ne da fasahar tsari. Idan yadda ake buƙata suna iya kasa fasahar tsari a siffofin duka, koyar da cewa bus tie breaker ya sa. Idan bai sa ba, sa shi kafin ake kasa fasahar tsari a siffofin duka. Ba haka, yadda ake buƙata voltage imbalance a siffofin duka zai iya haifar da circulating currents masu yawa a siffofin duka, wanda zai iya kasa low-voltage fuses da kuma haifar da power zuwa protection devices.

Rufe Fasahar Tsari: A double busbar system (a wasu configurations, fasahar tsari ya rufe a cikin bus), idan an buƙata aiki a fasahar tsari’s output disconnect switch, fasahar tsari, ko siffofin duka, yi aiki da wannan:

• Koyar da cewa protective relays da automatic devices da fasahar tsari ta bayar (idandaza a kan automatic ko manual transfer device, wanda zai iya haifar da waɗannan devices zuwa aiki).

• Remove secondary fuses don in kula ci abubuwa daga back-charging, wanda zai iya bazu siffofin duka.

• Kasa fasahar tsari’s output disconnect switch da kasa primary-side fuses.

• Yi aiki da voltage detector da ya fi shi rating da qualified don in tabbatar da ba a gaba da voltage a fasahar tsari’s incoming lines. Bayan a tabbatar da cewa an rufe, install grounding sets, hang warning signs, da kuma yi aiki bayan a samun work permits.

III. Precautions When Replacing a Voltage Transformer or Secondary Coil in Service

• Idan ake kawo fasahar tsari da take lalace a aiki, zaɓe fasahar tsari da voltage rating da take iya haɗa da system voltage, identical ratio, correct polarity, similar excitation characteristics, da kuma wanda ya samu duka tests da ake buƙata.

• Idan ake kawo group of VTs, koyar da connection group da phase sequence da VTs da za a yi aiki a parallel operation.

• Bayan a kawo fasahar tsari secondary coil, tabbatar da wiring don in kula ci abubuwa daga incorrect connections da kuma avoid secondary circuit short circuits.

• Bayan a kawo fasahar tsari ko secondary coil, ya kamata a yi test da polarity da kuma tabbatar da shi.

IV. Routine Inspection of Voltage Transformers in Service

• Inspect insulators don in tabbatar da clean, absence of damage, cracks, ko discharge phenomena.

• Tabbatar da oil level ya fi shi, oil color ya fi shi, da kuma ba a gaba da oil leakage ko seepage ba.

• Tabbatar da color of the desiccant a breather ya fi shi, da kuma ba a gaba da saturated ba. Replace desiccant idan 1/2 na take iya canza color.

• Listen for normal internal sounds; ba a gaba da discharging, severe electromagnetic vibration, ko burnt odors ba.

• Tabbatar da sealing system ya fi shi, all bolts ya fi shi, da kuma ba a gaba da loosening ba.

• Inspect primary lead connections don in tabbatar da good contact, ba a gaba da looseness ko overheating. Tabbatar da current-limiting resistor for high-voltage fuse da capacitor for open-circuit protection ya fi shi. Tabbatar da secondary circuit cables da wires ba a gaba da corrosion ko damage, da kuma ba a gaba da short circuits a secondary wiring ba.

• Tabbatar da primary neutral point grounding da secondary winding grounding ya fi shi.

• Tabbatar da terminal box ya fi shi da ba a gaba da moisture ba.