MASHINE ZAZUNGUKA KINYUME

MASHINE ZAZUNGUKA KINYUME

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clion dismas

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Wanabodi
Poleni na majukumu. Naomba tubadilishane uzoefu juu ya jambo hili.

Tumejenga msongo mkubwa wa kipande cha kilometa 8.5 kwa volti ya 33000volti, umeme wa njia tatu kwa ajili ya kuunganisha maeneo mawili( interconnector).

Project imekamilika na imekaguliwa na imewashwa( commisioning), taa na matumizi mengine yote yako ok lakini mashine zote ambazo zinatumika kubadili nguvu ya umeme kwenda makanika(rotational) zinaenda kinyume na awali kabla ya kuunga hii interconnector.

Ukiidisconnect na kutumia source nyingine inazunguka kawaida bila ya matatizo.

Tulidhani yumkini ni phase rotation problem lakini hapana. Je, kwa wenye uzoefu zaidi, tatizo laeza kua wapi?

Up to date we're digging in to find the solution on this while feeding customers with an altenative source.

Thanks in advance.

MREJESHO

Nasema ahsante kwa mawazo yenu yote mliyochangia eneo hili, yote yalifanyiwa kazi na mwishowe behaving ilikua vile vile.

Installation ilifumuliwa upya from tapping point to termination point. Phase sequence meter ilitumika kila hatua na kimsingi mambo yote yalifanyika kiufasaha na project baada ya mwezi ilipowashwa tena, mambo yalikua sawasawa. Cheers.
 
Robot la Matope said:
Hiki ndo nilitaka kukisema, RYB inakuwa ni positive wakati RBY ni negative, so ikiwa RYB na inabidi uibadili iwe RBY na kama ni RBY unaibadili inakua RYB.

ALL THE BEST
Click to expand...

Ndugu kimefanyika tayari but bado tabu palepale, soma vizuri bandiko pale juu nimeongelea phase rotation
 
clion dismas said:
Wanabodi
Poleni na majukumu. Naomba tubadilishane uzoefu juu ya jambo hili.

Tumejenga msongo mkubwa wa kipande cha kilometa 8.5 kwa volti ya 33000volti, umeme wa njia tatu kwa ajili ya kuunganisha maeneo mawili( interconnector).

Project imekamilika na imekaguliwa na imewashwa( commisioning), taa na matumizi mengine yote yako ok lakini mashine zote ambazo zinatumika kubadili nguvu ya umeme kwenda makanika(rotational) zinaenda kinyume na awali kabla ya kuunga hii interconnector.

Ukiidisconnect na kutumia source nyingine inazunguka kawaida bila ya matatizo.

Tulidhani yumkini ni phase rotation problem lakini hapana. Je, kwa wenye uzoefu zaidi, tatizo laeza kua wapi?

Up to date we're digging in to find the solution on this while feeding customers with an altenative source.

Thanks in advance.
Click to expand...
mbona hiyo shughuli SIJAWAHI kutana nayo.!
umechek kila kitu na njia zipo sawa?!
yamkini kuna hitilafu somewher jaribuni kucheck na kubadili hizo phase

Sent using Jamii Forums mobile app
 
Majibu ya tatizo lako yapo hapa chini, lakini naomaba ufungue link husika usome vizuri.
Kabla ya yote jaribu kubadili hizo phase mbili wakati moja ipo pale pale yaani kama RYB basi badili YB kuwa BY huku R ikibaki palepale, hivyo itakuwa RBY, hivyo kama bado badili RY wakati B ikiwa palepale, kama bado jaribu RB wakati Y ipo palepale ikishindikana endelea na maelezo hayo hapa chini kupima phase angle na phase sequence kama ilivyo elekezwa.

An application where both phase sequence and phase angle is important–Paralleling two transformers in a low voltage substation.
Often times it is desired to close the tie breaker and parallel the two medium voltage transformers for meeting the load requirement or some other requirements. Two things need to be performed (in the order) pertaining to phase sequence to make sure things work as intended.
  1. Check Phase Sequence:Using phase sequence meter , ascertain that the two sources have similar phase sequence, either both having ABC sequence or both having ACB sequence.
  2. Check Phase Angle: Measure the potential difference between the respective phases that is going to be paralleled. The magnitude of the potential difference between the corresponding phase will indicate the phase angle difference between the two sources. Ideally no potential difference should exist between say phase A of source 1 and phase A of source B if both sources have phases that are exactly at 0, 120, 240 degrees apart. Minor phase angle differences can usually be tolerated and it will only result in circulating ground current between the transformers. This test can also be done by using an oscilloscope. If large phase angle difference is noticed additional engineering need to be performed prior to paralleling two transformers.
Possible consequences of not checking the phase sequence while connecting devices:
  • Motors could rotate in the opposite direction and depending on the driven load it can damage the driven load.
  • Electromechanical relays could nuisance trip or worst not function at all.
  • Electromechanical power meters could give erroneous reading.
  • Dangerous short circuit current can flow while interconnecting sources with different phase rotation/sequence.
Possible consequences of not checking the phase angle while connecting devices:
  • Circulating phase current between the two sources which could result in overheated transformers.
  • Circulating ground currents between the two sources.
  • Circulating ground currents causing nuisance trip on ground fault relays.
LINK ya maelezoyote hii hapa Phase Sequence and Phase Angle – Voltage Disturbance

UKIFANIKIWA NJOO UNIPE MREJESHO TUTASAIDIA WENGI, SIO MBAYA UKINIRUSHIA BIA MBILI.
 
Titicomb said:
Majibu ya tatizo lako yapo hapa chini, lakini naomaba ufungue link husika usome vizuri.
Kabla ya yote jaribu kubadili hizo phase mbili wakati moja ipo pale pale yaani kama RYB basi badili YB kuwa BY huku R ikibaki palepale, hivyo itakuwa RBY, hivyo kama bado badili RY wakati B ikiwa palepale, kama bado jaribu RB wakati Y ipo palepale ikishindikana endelea na maelezo hayo hapa chini kupima phase angle na phase sequence kama ilivyo elekezwa.

An application where both phase sequence and phase angle is important–Paralleling two transformers in a low voltage substation.
Often times it is desired to close the tie breaker and parallel the two medium voltage transformers for meeting the load requirement or some other requirements. Two things need to be performed (in the order) pertaining to phase sequence to make sure things work as intended.
  1. Check Phase Sequence:Using phase sequence meter , ascertain that the two sources have similar phase sequence, either both having ABC sequence or both having ACB sequence.
  2. Check Phase Angle: Measure the potential difference between the respective phases that is going to be paralleled. The magnitude of the potential difference between the corresponding phase will indicate the phase angle difference between the two sources. Ideally no potential difference should exist between say phase A of source 1 and phase A of source B if both sources have phases that are exactly at 0, 120, 240 degrees apart. Minor phase angle differences can usually be tolerated and it will only result in circulating ground current between the transformers. This test can also be done by using an oscilloscope. If large phase angle difference is noticed additional engineering need to be performed prior to paralleling two transformers.
Possible consequences of not checking the phase sequence while connecting devices:
  • Motors could rotate in the opposite direction and depending on the driven load it can damage the driven load.
  • Electromechanical relays could nuisance trip or worst not function at all.
  • Electromechanical power meters could give erroneous reading.
  • Dangerous short circuit current can flow while interconnecting sources with different phase rotation/sequence.
Possible consequences of not checking the phase angle while connecting devices:
  • Circulating phase current between the two sources which could result in overheated transformers.
  • Circulating ground currents between the two sources.
  • Circulating ground currents causing nuisance trip on ground fault relays.
LINK ya maelezoyote hii hapa Phase Sequence and Phase Angle – Voltage Disturbance

UKIFANIKIWA NJOO UNIPE MREJESHO TUTASAIDIA WENGI, SIO MBAYA UKINIRUSHIA BIA MBILI.
Click to expand...


Hutoamini ndugu kwamba phase sequence na rotation zimefanyika correctly na hapa hakuna transformers zilizoungwa parallel.

Hii inteconnector katikati hakuna load yoyote wala nini. Na zaidi ni kwamba tapping area, huko itokako machine hazibehave namna hii.

Tumejaribu disconnect hii incomer mpya tuliyoijenga na ku feed na supply nyingine inatulia fresh.

Tume troubleshoot possibilities zote ila inakataa.

Pia nakumbuka mwezi uliopita katika wilaya iyoiyo kila ilipokua ikifika saa 4-5 usiku gridi ilikua inatoka kwa indication ya earth fault, yukasurvey na kupatrol line yote tukaclear bushes zote near line, tukaangalia discs zote kama zina fructurers, tukaangalia arrestors za kila transformer tukaangalia jumpers zote hakukua na shida yoyote na bado line ilikua inatoka saa ile ile na mda ule ule kwa indication ile ile (earth fault).

Tulifanya sagging upya karibu vipande vyote vilivyokua vinahisiwa but the problem was the same, ila ajabu tukiwasha mashine( diesel generator) badala ya grid, mzigo unakaa usiku wote.

Mwezi mzima ilikua ni tabu ya namna hii, tukadhani probably earth shield wire imeguswa na phase yeyote, no way.

Mwishoni tuligundua it was a nearby district prpblem, they had poor sagging. Tulipo kiondoa kile kipande after a month, line ilikaa hadi leo.

Em tuanze upya. I hope tutafika, thanks kwa ushauri pia.
 
Hamkustahili kupewa hiyo tenda.aisee mnahangaika hangaika kwa kubahatisha mtaunguza kijiji.
 
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