Tambayar Gaba-gaban Ƙarshen Kirkiro na Maimaituwar Sule

1. Yanayi na Nau'i

A watan Satumba 2023, a matsayin mai sarrafa nau'in yanayi na farko, nake da shawarar tsari na karamin kashi na 10kV Section I bus ta gurbin kashi a lokacin tushen maimaita da nake bayyana ita tun dacewar zuwa takammatan sarrafa da iya hikima. Tushen maimaita ya baka: U₀ = 0 kV, U_a = 6.06 kV, U_b = 5.93 kV, Uc = 6.05 kV, U_ab = 10.05 kV, U_bc = 5.94 kV

Nami da takammatan sarki ne suka zama zuwa gida. An yi fata cewa karamin kashi na biyu na 10kV Section I bus voltage transformer ya ci yadda aka fi sako, kuma an samu U-phase fuse ya zama rasa. Ba a ci saukar wannan breaker ba, ana yi automatic activation a 900 bus-sectioning circuit breaker, wanda ya kare 95A breaker a karamin kashi na 10kV side na No. 1 main transformer inter-tripping lines 911-915, sannan ya ci 900.

Ba a ci karshen biyu ba, an duba babban fuska da fuse na voltage transformer (duka suka duba). A lokacin dubawa na karshen biyu, nake da shawarar terminal A660 na gaba-gaban ci. Ba a ci abinci ba, an yi tasiri masu kyau a karamin kashi na 10kV Section I bus.

2. Tatsuniyar Sababbi

Karamin kashi na 10kV Section I bus tana da feeders 6, 5 (911-915) suna haɗa da small hydropower. Idan ake yi full generation, karamin kashi na 10kV side na No. 1 main transformer ya rage, wanda ya zama karamin kashi ta zama masu kyau.

Takammatan sarki, ta amfani da ilimi, suka ci breaker na biyu na voltage transformer bili a duba darasi ga adadin gwamnati. A wannan lokacin, current na 95A breaker (≈48A) ya ci shaida ga no-voltage/current condition (secondary value: 25V, 0.02A). Auto-backup ya faru, wanda ya kare 95A breaker da inter-tripping 5 small-hydropower feeders. Sababin da ke cika shine ba a ci exit auto-backup a lokacin da aka yi handling na voltage transformer, wanda ya zama misoperation.

3. Masana'antar Inganci

Capacitive voltage transformers tana da nau'ukan da dama, inda output na biyu na voltage yana zama mafi yawan nau'i. Takammatan sarki da operation and maintenance staff ya kamata:

• Yin amfani da management na department, ya kamata aiki da ma'aikatar, kuma tuntubi masu alarami don samun nau'i a lokacin da ya faru.

• Duba danger points a handling na voltage transformer, update regulations na gida. Idan ake yi replacement da fuses (ko wasu abubuwan sama), duba current na main transformer da settings na auto-backup. Idan current ya zama mafi yawan no-current threshold, yi procedures don exit auto-backup.

• Sauri masana'antar zuwa “three-mistake” (mis-operation, mis-wiring, mis-setting) accidents, yi training. Standardize emergency disposal processes don samun hanyoyin ba daidai ba.

• Yin amfani da on-site risk control; label equipment na gaba-gaban ci masu shaida ga misoperation.