Nheyo dzeSimba reMagetsi muSisitimu yeMagetsi
Simba remagetsi ndeimwe yemhando dzesimba dzinoshandiswa zvakanyanya muhupenyu hwemazuva ano, kubva pamwenje wepamba nekugadzira kusvika kumasisitimu ekufambisa nekutaurirana. Pasinei nekureruka kwaro, simba remagetsi rinogadzirwa, rinotumirwa, uye rinoparadzirwa kuburikidza ne network hombe inonzi system yemagetsi. Kuti system iyi ishande zvakachengeteka, zvakagadzikana, uye zvinobudirira, kunzwisisa misimboti yekutanga yesimba remagetsi, hunhu hwemutoro, uye kuti simba rinoyerera sei kubva kumajenareta kuenda kune vatengi kwakakosha. Chinyorwa chino chinokurukura misimboti iyi yekutanga sehwaro hwekunzwisisa mashandiro esystem yemagetsi.
1. Kunzwisisa simba remagetsi nehuwandu hwaro hwemagetsi
Zvichitaurwa zviri nyore, simba remagetsi kugona kwemagetsi kuita basa. Kana tichitarisa macircuit nemasystem emagetsi, simba remagetsi rine chekuita nekufamba kwechaji yemagetsi nekuda kwemusiyano unogona kuitika (voltage). Humwe huwandu hwepakutanga hunogara huchionekwa mukuongorora masisitimu emagetsi ndehu:
– Voltage (V): musiyano wemagetsi "unosunda" kuyerera kwemagetsi. Chikamu: volt (V).
– Current (I): mwero wekufamba kwemagetsi. Chiyero: amperes (A).
– Simba (P): mwero wekushandiswa kana kugoverwa kwesimba remagetsi pachikamu chenguva. Chikamu: watt (W).
– Simba (E): simba rinounganidzwa nekufamba kwenguva. Rinowanzoonekwa mumaawati-maawa (Wh) kana makilowati-maawa (kWh).
Hukama huripo pakati pesimba, voltage, uye current muDC system kana kuti purely resistive AC system hunogona kuratidzwa seizvi:
P = V × I .
Panguva imwe chete, simba remagetsi rinoshandiswa panguva yakatarwa nderinotevera:
E = P × t .
Mukushandiswa kwesimba remagetsi, kWh unit inonyanya kushandiswa kuverenga mashandisirwo emagetsi nevatengi nekuti ine chekuita nemitengo yemagetsi.
2. Pfungwa yekugadzira, kutapurirana uye kugoverwa
Sisitimu yemagetsi ine matanho makuru matatu:
1. Kugadzirwa: simba rekutanga (marasha, gasi, mvura, geothermal, mhepo, zuva, nyukireya) rinoshandurwa kuita simba remagetsi uchishandisa jenareta.
2. Kutakurwa kwemagetsi: magetsi anotumirwa kure kubva kujenareta kuenda kunzvimbo yekutakura zvinhu kuburikidza nemitsetse yemagetsi ane simba rakawanda.
3. Kugoverwa: magetsi anoderedzwa kuti apihwe kune vatengi (mhuri, mabhizinesi, maindasitiri).
Sei kutumirwa kwemagetsi kuchishandisa voltage yakakwira? Nekuti pamagetsi akafanana, kuwedzera voltage kunoderedza magetsi. Kurasikirwa muconductor kunonyanya kurasikirwa nekupisa (I²R), saka magetsi akaderera zvinoreva kurasikirwa kwakaderera uye sisitimu inoshanda zviri nani.
3. Simba riri mumasisitimu eAC: rinoita basa, rinoita basa, uye rinoonekwa
Masisitimu mazhinji emagetsi anoshandisa alternating current (AC) nekuti zviri nyore kukwira/kudzika nematransformer uye zvinoshanda zvakanyanya pakutumira magetsi kure. Zvisinei, AC inounza pfungwa dzesimba dzakaomarara nekuda kwemusiyano wechikamu pakati pevoltage necurrent, kunyanya kune inductive loads (motors, transformers) uye capacitive loads (capacitor banks).
Mune sinusoidal AC system, simba rakakamurwa kuita:
– Simba rinoshanda (P): simba rinoshandiswa kugadzira basa chairo (kutenderera kwemota, kudziyisa, mwenje). Chiyero: watt (W).
– Simba rinoita basa (Q): simba rinochinjana rinochengetwa uye rinoburitswa nechinhu chinobatsira/chinogonesa, risingaburitse basa chairo asi rinodiwa kuti pave nesimba remagineti kana remagetsi. Chikamu: volt-amperes reactive (VAR).
– Simba rinooneka (S): musanganiswa wemavector P naQ, zvichiratidza kugona kwese kunofanirwa kupihwa nesource/channel. Zvikamu: volt-amperes (VA).
Hukama huri pakati pevatatu hunoumba simba retriangle:
S² = P² + Q² .
Pfungwa iyi inokosha nekuti michina (majenareta, matransformer, tambo) inofanira kukwanisa kutakura simba rinooneka, kwete simba rinongoshanda chete, kuitira kuti simba guru rinoita basa rikwanise kuremedza sisitimu.
4. Simba remagetsi uye mhedzisiro yaro pakushanda zvakanaka
Simba chinhu (cos φ) chiyero chesimba rinoita basa kune simba rinoonekwa:
pf = P / S = cos φ .
Kukosha kwesimba kunobva pa0 kusvika pa1. Muzvinhu zvinopa simba, simba remagetsi rinononoka kuseri kwevoltage, saka simba remagetsi rinowanzova rakaderera. Simba rakaderera rinokonzera:
– Simba guru remagetsi rinoita basa rimwe chete.
– Kurasikirwa kweI²R kunowedzera uye kupisa kwemuchina wekufambisa mhepo kunowedzera.
- Kudonha kwemagetsi kwakanyanya.
- Kugona kwetransformer nejenareta "kunoshandiswa" kupa Q, kwete P chete.
Saka, masisitimu emagetsi anowanzo gadzirisa reactive power compensation, semuenzaniso achishandisa capacitor banks kana FACTS devices, kuti avandudze power factor uye achengetedze voltage yakagadzikana.
5. Matransformer nebasa remagetsi mumagetsi
Matransformer chinhu chakakosha mumasisitimu emagetsi eAC. Anoshanda panheyo ye electromagnetic induction, achichinja mazinga emagetsi pasina kuchinja frequency. Ne transformer:
– Voltage inowedzerwa kudivi rinogadzira magetsi kuti atumirwe kure (zvichideredza magetsi nekurasikirwa).
- Voltage inodzikiswa pedyo nemutengi kuti pave nekuchengetedzeka uye kuti michina ienderane.
Zvakanaka, simba riri pamativi ekutanga neechipiri rakafanana (tisingateereri kurasikirwa):
V₁I₁ ≈ V₂I₂ .
Izvi zvinosimbisa kuti sezvo magetsi achiwedzera, magetsi anoderera, uye zvinopesana. Iyi ndiyo nheyo huru nei ma network ekutumira magetsi achishandisa magetsi akakwira.
6. Mutemo weOhm uye impedance mumagetsi emagetsi
Mumasisitimu emagetsi, maconductor haana kungova ne resistance chete, asiwo inductance uye capacitance, kunyanya mumitsetse mirefu. Saka, ongororo inowanzo shandisa impedance (Z) pachinzvimbo cheR chete. Impedance musanganiswa we resistance uye reactance:
Z = R + jX.
– R (resistance) inokonzera kurasikirwa kwesimba chairo (kupisa).
– X (reactance) inokanganisa kuyerera kwesimba rinoita reactive uye voltage profile.
Kune network yeAC, hukama hwakakosha ndehwekuti:
V = I × Z.
Izvi zvinobatsira kuongorora kudonha kwemagetsi, kurasikirwa, uye kugadzikana kwehurongwa. Mukutumira kure, simba rekuita zvinhu rinoonekwa zvakanyanya, zvichiita kuti kutonga kwesimba rekuita zvinhu uye muripo zvive zvakakosha.
7. Kuyerera kwesimba uye kuenzana kwemutoro wekugadzira
Imwe yenheyo dzakakosha mukushanda kwesimba remagetsi ndeyekuenzana kwesimba: nguva dzese, simba rinogadzirwa rinofanira kuenzana nesimba rinodyiwa nemutoro pamwe nekurasikirwa kwenetwork. Kana kugadzirwa kuri kushoma pane mutoro, frequency inowanzo kudzikira; kana kugadzirwa kuri kukuru, frequency inowedzera. Ndosaka masisitimu emagetsi achida:
- Kudzora mafrequency kuburikidza negavhuna pajenareta uye kudzora mutoro.
- Kudzora voltage kuburikidza nekukurudza jenareta, kugadzirisa transformer tap, uye kudzoreredza simba remagetsi.
Munyika dzakawanda, mafrequency ehurongwa anochengetwa pamutengo wakajairika (semuenzaniso, 50 Hz). Kugadzikana kwemafrequency kunoratidza kuti hurongwa hwakarongeka uye hunodzorwa.
8. Dziviriro nekuvimbika: kuchengetedzeka senheyo huru
Simba remagetsi rine njodzi kana rikasatarisirwa zvakanaka. Masisitimu emagetsi anofanira kunge aine dziviriro yekudzivirira kukuvara kwemidziyo uye kudzivirira vanhu. Zvikanganiso zvakaita sema "short circuits", mheni, insulation yakakuvara, kana overloads zvinogona kuunza ma "currents" akakwira kwazvo. Saka, zvinotevera zvinoshandiswa:
- Muchina wekupwanya dunhu,
- Kutumirana kwekudzivirira,
- Fuse,
- Sisitimu yekuisa pasi,
– Zvimiti zvemheni nezvinodzivirira.
Kuvimbika kwesystem kunowedzerwawo kuburikidza nekudzokororwa kwenetwork, kugadziriswa nguva dzose, uye kutarisa mamiriro emidziyo. Chinangwa ndechekuona kuti magetsi anowanikwa nguva dzose kunyangwe paine zvikanganiso mune imwe chikamu chesystem.
9. Kushanda zvakanaka uye kurasikirwa mumagetsi
Kurasikirwa kukuru mumagetsi kunosanganisira:
– Kurasikirwa kwesimba (I²R) mumakondirakita nemakoira etransformer.
– Kurasikirwa kwepakati petransformer (hysteresis uye eddy current).
– Kurasikirwa kwemuchina mujenareta (kukweshana, mhepo).
- Kurasikirwa kunokonzerwa nehunhu hwesimba senge harmonics kubva muzvinhu zvisiri zvemutsara.
Kushanda zvakanaka kwesystem kunovandudzwa kuburikidza nekugadzirwa kwakanaka kwenetwork, kusarudzwa kwakanaka kwemagetsi ekutumira, simba rakawedzerwa, kushandiswa kwemaconductor emhando yepamusoro, uye kushandiswa kwetekinoroji yemazuva ano yekutarisa nekudzora.
Mhedziso
Nheyo huru dzesimba remagetsi mumagetsi dzinosanganisira hukama huripo pakati pemagetsi, magetsi, simba, uye simba; pfungwa yesimba rinoita serinoshanda-rinooneka mumagetsi eAC; basa rematransformer mukudzora magetsi; simba reimpedance nekurasikirwa mukutumira magetsi; uye kukosha kwekuenzanisa kwemutoro wekugadzira magetsi kuti uchengetedze frequency nemagetsi. Kupfuura hunyanzvi, magetsi anovimbawo nemaitiro ekudzivirira, kudzora, uye kuvimbika kuti ave nechokwadi chekugoverwa kwemagetsi kwakachengeteka uye kwakasimba. Nekunzwisisa izvi zvakakosha, tinogona kuona kuti magetsi atino "ngochinja switch" ndiwo mugumisiro wesystem yakaoma uye inoyerwa inomhanya kubva pachiteshi chemagetsi kuenda kudzimba dzedu.
