A cikin tattalin karkashin kashi, voltage transformers a GIS (Gas Insulated Switchgear) suna da muhimmanci wajen karkashin kashi da kuma kungiyar hankali. Zan iya zabi model na daidai da kuma sa shi daidai ita ce mai muhimmanci don jirgin karkashin wurin. Duk da haka, ya kamata a duba abubuwa masu muhimmanci game da zabi da kuma sa.
I. Abubuwan Muhimmanci Don Zabi
(1) Tsari Na Karkashin Kashi
Karkashin Kashi: Yana da kyau a zama da tsohon karkashin kashi na GIS system. Misali, 110kV da 220kV GIS systems sun bukata voltage transformers na karkashin kashi na musamman don inganta karkashin kashi da kuma jirgin karkashin wurin.
Tsarin Karamin Kashi: Zabba ta da karkashin kashi na wurare da ke tsari a kan karamin kashi na biyu (kamar kalkulatoci da kuma wurare na kungiyar hankali). Idan akwai wurare da yawa da kuma karamin kashi mai yawa, ya kamata a zaba transformer na karamin kashi mai yawa don bincika cewa ba za su iya tabbatar da karkashin kashi ko kada wurin babbar.
Classin Karkashin Kashi: Za a bayyana saboda ma'adin da ke yi. Don kungiyar kashi, ana bukata classin karkashin kashi mai yawa, yawancin da suka 0.2 ko 0.5; don kungiyar hankali, 3P ko 6P ne kafin ya fi yawa.
(2) Tabbatar Da Kyaukan Hanyoyin Kashi
Na'uran Hanyoyin Kashi: Voltage transformers a GIS suna amfani da SF₆ gas insulation ko kuma epoxy resin casting insulation. SF₆ gas insulation na da kyaukan hanyoyin kashi da kuma kyaukan kawo kashi, amma epoxy resin casting insulation na da kyaukan hanyoyin kashi mai kyau da kuma kyaukan kawo kashi. Zan iya zaba daga baya saboda yanayin hanyoyin kashi da kuma ma'adinta.
Level na Hanyoyin Kashi: Yana da kyau a zama da kyaukan hanyoyin kashi na tsohon karkashin kashi, lightning overvoltage, da kuma operating overvoltage na system. Yawan karkashin kashi, yawan kyaukan hanyoyin kashi, wanda yake da alaka da karkashin karkashin wurin.
(3) Tabbatar Da Kyaukan Kudeta Resonance
Ferromagnetic resonance na iya faru a cikin tsarin kashi, wanda yake da kyau don kada voltage transformers. Saboda haka, ya kamata a zaba mafi kyaukan kudeta resonance, kamar mafi device na harmonic elimination, don kudeta faruwar resonance da kuma gida na resonance.
(4) Inganta Kyaukan Karkashin Kashi
A lokacin da a kawo, sa, da kuma a yi, an samun wurin da za a iya faɗa, kawo, ko kuma karamin kashi a lokacin da kashi mai yawa. Tsarin kashi na voltage transformer ya kamata a zama da kyau, da kyaukan karkashin kashi mai yawa don kawo wannan wurare da kuma kada lafiya ko kada wurin.
II. Abubuwan Muhimmanci Don Sa
(1) Duba Yanayin Sa
Kyaukan Hanyoyin Kashi: A cikin GIS ya kamata a zama da kyau, bane da dust, metal debris, ko kuma abubuwan gaba, wanda za su iya tabbatar da kyaukan hanyoyin kashi na voltage transformer ko kuma kada faruwar discharge faults. A baya da sa, ya kamata a hauƙi da kuma duba air chamber na GIS.
Kyaukan Hanyoyin Kashi: Kyaukan hanyoyin kashi na air chamber na GIS yana da kyau don kudeta leakage na SF₆ gas. SF₆ shine medium na kyaukan hanyoyin kashi da kuma kawo kashi a cikin equipment na GIS, da kuma leakage zai iya kudace kyaukan hanyoyin kashi da kuma kada jirgin karkashin wurin.
Hanyar Jiki da Faduwa: Hanyar jiki da faduwa na yanayin sa ya kamata a zama da product requirements, yawancin a cikin yanayin da ake fitowa da faduwa mai yawa. Faduwa mai yawa na iya kudeta hanyoyin kashi ko kuma kada jirgin karkashin wurin.
(2) Amfani Da Tsarin Sa
Lift and Handling: Idan a kawo da kuma lift voltage transformer, ya kamata a amfani da alatun lift daidai da kuma a yi da kiyasin lifting points na product don kudeta kafa, kawo, ko kuma faɗa mai yawa, wanda za su iya kada lafiya ko kada wurin.
Kungiyar Kashi: Kungiyar kashi na circuit na biyu ya kamata a zama daidai da kuma kyau, da kuma kungiyar kashi na kyaukan hanyoyin kashi don kudeta kada kungiya da kuda. Don kungiyar kashi na primary side, ya kamata a zama da kungiyar kashi mai yawa, da kuma kyaukan kashi, da kuma zama da karkashin kashi mai yawa.
Talabijin Grounding: Winding na biyu da kuma shell na voltage transformer ya kamata a zama da grounding mai yawa don kudeta karkashin wurin da kuma mutane. Resistance na grounding ya kamata a zama da standards, yawancin bane da 4 ohms.
(3) Yi Debugging Ba Da Sa
Testing na Kyaukan Hanyoyin Kashi: Ba da sa, ya kamata a yi testing na resistance na hanyoyin kashi da kuma testing na withstand voltage don duba cewa kyaukan hanyoyin kashi na voltage transformer na da kyau.
Check na Transformation Ratio and Polarity: Test whether the transformation ratio meets the design value to ensure measurement accuracy; check whether the polarity is correct to avoid incorrect instrument indication or misoperation of protection devices.
Gas Detection (for SF₆ Insulation Type): For those using SF₆ insulation, detect the gas pressure and micro-water content in the air chamber to ensure they are within the normal range.
In conclusion, considering parameter matching and reliable performance during selection, and paying attention to the environment, process, and debugging during installation, can ensure the safe and stable operation of GIS voltage transformers and guarantee the reliable power supply of the power system.
