Li-slip rings tsa moea li nyane ha li bapisoa le li-blades kapa li-gearbox, empa khokahano e le 'ngoe e mpe e ka emisa-mochini oa megawate e mengata. Mosebetsi oa bona ke ho fetisetsa matla, matšoao a taolo, le data ho pholletsa le li-interfaces tse potolohang ka hare ho hub, jenereithara, 'me ka linako tse ling kopano ea yaw. Ha phetisetso eo e fetoha e sa tsitsang, litlamorao hangata li hlaha e le liphoso tsa molumo, data ea sensor ea nakoana, kapa maeto a sa hlophisoang-maetong a litšebeletso tsa tora - le libakeng tse ka thoko, leeto le le leng la ho nka sebaka se le seng le ka bitsa chelete e ngata ho feta slip ring ka boeona.
Tataiso ena e ngoletsoe lienjineri, batsamaisi ba thepa, le lihlopha tsa ho reka thepa tse hlokang ho khethamehele e thellang ea turbine ea moeabakeng sa meaho e mecha, li-retrofits, kapa tse nchafalitsoeng. E akaretsa moo mehele ea li-slip e lutseng ka har'a turbine, hore na e hloleha joang, hore na e ka hlakisa eng, le mokhoa oa ho bapisa mahlale a puisano ntle le ho oela marabeng a tloaelehileng a khetho.
Seo Wind Turbine Slip Rings e se Etsang
Ring e thellang ke sebopeho sa electromechanical se lumellang lipotoloho tsa motlakase le matšoao ho tšela ho tloha foreiming e emeng ho ea ho e potolohang. Ka har'a lisebelisoa tsa sejoale-joale-sekala sa turbine, hangata u fumana li-slip rings tse nang le mefuta e meraro ea sephethephethe hang-hang:
- Motlakase oa motlakase bakeng sa phetoho ea blade angle
- Lipontšo tsa ho laola le ho fana ka maikutlo pakeng tsa tsamaiso ea molumo le molaoli ea ka sehloohong
- Lintlha tsa sensor joalo ka blade strain, mocheso, vibrate, le ho lemoha leqhoa
Taolo ea molumo ke eona tsela ea bohlokoa ka ho fetisisa-ea tšireletso ho tse tharo.Letoto la IEC 61400Litekanyetso tsa turbine ea moea li hloka hore litsamaiso tsa ho phahama li lule li khona ho etsa masiba le tlas'a maemo a phoso, ho bolelang hore selikalikoe se thellang se tlameha ho tsoela pele ho sebetsa ka ho thothomela, ho fetoha ha mocheso, condensation, le limilione tsa lipotoloho ho pholletsa le lilemo tse 20 tsa bophelo ba moralo. Karolo ea €200 e lutseng ka har'a hub e ka etsa qeto ea hore na turbine ea 5 MW e hlahisa kapa e lutse e sa sebetse e emetse crane.
Moo Mehele ea Slip e lutseng ka har'a mochini oa moea
Mokhoa oa khetho o fapane bakeng sa sebaka ka seng. Ho li kopanya - ka mohlala, ho hlakisa moralo oa sebaka sa generator bakeng sa potoloho ea jenereithara - ke e 'ngoe ea liphoso tse turang haholo sehlopheng sena.
Hub Slip Rings (Sistimi ea Pitch)
Mehele ea Hub slip e behiloe holim'a shaft e kholo ebe e potoloha ka rotor. Ba na le matla a motlakase (hangata a 400-690 V AC kapa DC bus voltages), matšoao a ho laola molumo (CANopen, Profibus, kapa proprietary protocols), le palo e ntseng e eketseha ea liteishene tsa blade sensor. Marang-rang a Hub slip rings hangata ke a maholo-a borehiloeng ka lebaka la hore rotor shaft e feta ho ona, 'me a tlameha ho phela ka vibrate spectra e thata ho feta lisebelisoa tse ngata tsa feme.
Mehele ea jenereithara ea Slip (Mechini ea DFIG)
Ka makhetlo a mabeli-lijenereithara tse feptjoang (li-DFIG), tse ntseng li tloaeleha ho likepe tse lebōpong la leoatle, li sebelisa li-slip rings ho rotha ho fepa maqhubu a AC ho matsoelintsoeke a rotor. Tsena li bona maqhubu a phahameng (hangata a makholo a 'maloa a li-ampere), lebelo le phahameng la ho potoloha, le tlhahiso e kholo ea lerōle la carbon. Brush grade, ring surface finish, khatello ea nako ea selemo, le nacelle ventilation kaofela li ama bophelo ba ts'ebeletso ka kotloloho. Direct-li-drive permanent-magnet turbines ha li hloke slip ring ena ho hang - lebaka le le leng la hore sethala sa offshore se leba ho direct{7}}
Mehele ea Yaw Slip
Bongata ba li-turbine tse kholo li sebelisa leqhubu la thapo le mokhoa oa ho sa sothoe ho e-na le selikalikoe sa ho thella, empa li-turbine tse nyane (hangata tse ka tlase ho ~500 kW) ka linako tse ling li sebelisa selikalikoe sa ho thella holimo tora ho lumella ho potoloha ho tsoelang pele. Tsena li shebane le lebelo le tlase empa li pepeseha haholoanyane tikolohong le sebaka se tiileng sa ho hola.
Hub vs Jenereithara vs Yaw
| Paramethara | Hub (Pitch) | Jenereithara (DFIG) | Yaw (Li-turbine tse Nyenyane) |
|---|---|---|---|
| Lebelo le tlwaelehileng | Ho fihlela ho ~ 20 rpm | 900-2,000 rpm | <1 rpm |
| E tloaelehileng ea hona joale ka selikalikoe | 10–63 Matla, le lets'oao le kopaneng | 200–1,500 A | 5–30 A |
| Sehlopha sa motlakase | 400–690 V le leqhubu la -tlase la motlakase | 690 V (lehlakore la rotor) | 230–400 V |
| Khatello ea kelello e laolang | Ho thothomela, condensation, lerata la matshwao | Ho roala borashe, lerole, mocheso | Boemo ba leholimo, moholi oa letsoai |
| Likanale tse tloaelehileng | 20–60 (matla a tsoakiloeng/pontšo) | 3 matla + mobung | 4–24 |
| Tataiso ea nako ea litšebeletso | 12-24 likhoeli tlhahlobo | Likhoeli tse 3-12 ho hlahloba borashe | Likhoeli tse 12 |
Litekanyetso tse ka holimo ke mekhahlelo e tloaelehileng ho tloha ho li-database tsa moetsi le libuka tsa tšebeletso ea OEM; lipalo tsa 'nete tsa mochini oa hau li tlameha ho tsoa litokomaneng tsa turbine le litlaleho tsa liteko tsa mofani oa thepa ea lireng.
Mokhoa oa ho thella oa turbine ea moea o hloleha joang
"Slip ring failure" ke sehlopha se sa hlakang. Ha re le tšimong, mathata a batla a khutlela ho o mong oa mekhoa e ka tlase ho - 'me e 'ngoe le e 'ngoe e supa moetso o fapaneng kapa tokiso.
- Ho roala borashe le ho tlala lerole.borashe ba k'habone le tšepe{0}} ba graphite bo hlahisa lerole ha bo ntse bo roaloa. Ntle le moea o kenang, lerōle le bokellana holim'a sekontiri 'me le baka litselana tse lutlang lipakeng tsa liring tse haufi, tse bonts'ang e le khanyetso ea insulation e theohelang ka tlase ho 100 MΩ kapa e le sebaka sa mathata{3}}maeto a phoso.Mekhoa ea ho roala borashehangata ke letšoao la pele leo setsebi sa tlhahlobo se se bonang.
- Ho phahama ha khanyetso.Oxidation, tšilafalo, kapa tahlehelo ea khatello ea selemo e eketsa khanyetso ea likhokahano ho tloha ho milliohm ho ea ho ohm range. Ho sekontiri sa motlakase sena se baka ho theoha ha motlakase le ho futhumatsa; moleng o tlase{{1}o phahamisa lerata mme o ka senya lithelekramo tsa CAN.
- Condensation le corrosion.Libaka ke libaka tse mongobo - mechine e futhumetseng, tšepe e batang, moea o phelang. Ho kenya likoti holim'a selikalikoe ho latela kapele, haholo libakeng tse lebopong la leoatle le kantle ho leoatle moo aerosol ea letsoai e leng teng. Bakeng sa li-platform tsa offshore, tse inehetsengmehato ea ts'epo ea kantle ho nahahangata li ngoloa ho spec.
- Ho thothomela-ka lebaka la ho thothomela ha lithapo le likhokahanyo.Ring ea ho thella ka boeona e ka ba hantle, empa likhoele tsa pigtail, li-strain reliefs, kapa lihokelo li khathala sebakeng sa ho kena. Sena se tloaeleha ho feta{1}}ho hloleha ha lipina ho bapalami ba bacha.
- Ho senyeha ha mafura.Meetso e meng e sebelisa lubricant kapa oxidation inhibitor. Ha nako e ntse e ea e ea polima kapa ea omella, haholo-holo ka holimo ho likhato tse 60 tsa mocheso oa nacelle, le ho fetoha ha boitšoaro ba ho kopana.
- Ho senyeha ha insulation.Ho latela li-insulator tse silafetseng ho ka baka flashover, haholo-holo {{0}libese tse nang le motlakase oa motlakase. Hona ke ho hloleha ho thata, eseng ho kheloha ha maemo.
Bongata ba mekhoa ena e etsahala butle-butle, 'me e mengata e ka bonoa nakong ea tlhahlobo e reriloeng - empa ha feela mokhoa oa ho hlahloba o lekanya khanyetso ea ho kopana, ho hanyetsa ho pata, le bolelele ba borashe, ho e-na le ho "sheba ka hare ho setsi."
Ho hlalosa Litlhoko tsa Motlakase
Pele u ikopanya le barekisi, ngola enfelopo ea motlakase pampiring. Bafani ba thepa ba tla e kopa, 'me kopo-ea{2}}quote (RFQ) e tla potlaka ha likarabo li etsoa qeto esale pele.
- Hona joale ka potoloho, ka bobeli e tsoelang pele le tlhōrō (setsi sa motlakase sa motlakase se ka ba 3–6× nominal).
- Sehlopha sa motlakasele hore na potoloho ke AC kapa DC. Bakeng sa litsamaiso tsa 690 V, netefatsa hore na IEC 60664 overvoltage category III kapa IV ea sebetsa.
- Palo ea lipotoloho tsa motlakasekhahlanopalo ea li-circuits tsa matšoao / data, e lule e arohane.
- Li-protocol tsa matšoao- CANopen, Profibus DP, EtherCAT, Profinet, Ethernet 100/1000 Mbit, kapa lithapo tsa sensor tsa analogue. Protocol e 'ngoe le e' ngoe e na le mamello e fapaneng ea lerata.
- Tekanyetso ea lerata la motlakasebakeng sa likanale tsa sensor. Likh'outu tsa molumo le -litekanyo tsa "pin strain gauges" hangata li hloka bohloeki ba boemo ba millivolt-;ho laola lerataka har'a slip ring ke karolo ea ho kopana le budget eo.
- Litlhoko tsa insulation le dielectric- Ka tloaelo E Kholo ho feta kapa e lekana le 1,000 MΩ ho 500 V DC bakeng sa li-circuits tsa motlakase, hammoho le teko ea -frequency standstand test.
- Earthing. Meetso e mengata e kenyelletsa reng e arohaneng ea lefatše kapa borashe; bakeng sa libaka tse nang le lehalima{1}}ha ho buisanoe ka tsona{2}.
Ho khetha Theknoloji ea ho Kopana
Ha ho thekenoloji e le 'ngoe ea ho ikopanya e molemo bakeng sa ts'ebeliso e' ngoe le e 'ngoe ea turbine ea moea. Karabo e nepahetseng hangata ke lebasetere le sebelisang mahlale a fapaneng bakeng sa likarolo tsa matla le lipontšo tsa kopano e le 'ngoe.
Li-Brushes tsa Carbon le Metal{0}}Graphite
Li-brashi tsa carbon le silver-graphite ke tsona tse ka sehloohong-lisebelisoa tsa hajoale - tse tsosang takatso le libese tsa motlakase. Li mamella maqhubu a phahameng, li amohela tšilafalo e itseng, 'me ha li theko e boima ho li fetola. Thekiso{{5}ke ho hlahisa lerole, lerata le utloahalang, 'me ho hlokahala hore nako le nako ho hlahlojoe bolelele ba borashe le khatello ea selemo. Themokhahlelo oa borashe(resin-bond carbon, electrographite, metal-graphite, copper-graphite) e lokela ho tsamaisana le ho teteana ha hona joale le lintho tse llang.
E loketseng ka ho fetisisa bakeng sa: matla a motlakase, ho hlasimolla ha jenereithara, ho beha fatše. Ela hloko: ho bokellana ha lerōle meheleng ea mats'oao e haufi, khatello ea nako ea selemo, lerōle la borashe holim'a li-encoder optics haeba li behiloe haufi.
Mabitso a Fiber Brush (-Mekhoa e mengata)
Meetso ea borashe ea fiber e sebelisa mekotla ea khauta e hloekisitsoeng kapa ea khauta-ea lithapo tsa alloy tse palameng lesale la bohlokoa-le tšepe. Ka libaka tse ngata tsa ho kopana tse bapileng le matla a tlase haholo a ho ikopanya ka filament ka 'ngoe, li hlahisa hoo e batlang e se lithōle 'me li na le lerata le fokolang haholo. Ke khetho e hlahelletseng bakeng sa liteishene tsa sensor le data meheleng ea sejoale-joale ea hub.
E loketse hantle bakeng sa: CAN/Profibus/Ethernet data lines, blade sensor signals, tlase-taolo ea hajoale. Sheba bakeng sa: hajoale e lekantsoeng ka bongata ba filament (hangata<10 A), higher cost, and sensitivity to chemical contamination on the gold surface.
Monofilament le Noble{{0}Metal Wire Contacts
Monofilament noble-likhoele tsa tšepe (khauta e le 'ngoe kapa khauta-mohala oa motsoako holim'a lesale la bohlokoa-le tšepe) li lula pakeng tsa borashe ba fiber le borashe ba setso. Li tloaelehile ka compactlesale la tloaelo la ho thelladikopano moo sebaka se leng thata.
E loketse hantle bakeng sa:-li-circuits tsa hona joale tse tlase, li-hybrid assemblies. Ela hloko: ho roala ha tšepe ka mor'a hore ho be le lipalo tse phahameng haholo, 'me taba ea hore "khauta-e patiloeng" ha e betere - gauta e tšesaane ho feta substrate e bonolo e ka senyeha ka potlako ho feta borashe ba silevera e boletsoeng{4}}ka graphite.
Meetso ea Hybrid
Ka mokhoa o tloaelehileng oa "hub slip ring", karolo e ka tlase e na le matla a motlakase holim'a carbon kapa tšepe-borashe ba graphite, stack e bohareng e jara sebaka-sephethephethe sa libese ka borashe ba likhoele, 'me stack e ka tlase e tsamaisa{2}lithapo tsa sensor tse tlase ho khauta{3}}ka{4}likhokahano tsa khauta. Earthing e holim'a selikalikoe sa eona se inehetseng se nang le borashe bo sa hlokahaleng. Karohano ena ke eona e lumellang kopano e le 'ngoe ho finyella litlhoko tse hanyetsanang (lerata le phahameng la hona joale + le tlaase) ka nako e le 'ngoe.
Tlhaloso ea Tikoloho: Se Emise ho "Industrial Grade"
"Industrial grade" ha e u bolelle letho le molemo. Linomoro tse ka tlase ke tsona tsa bohlokoa letlapeng la lintlha tsa turbine ea moea.
- Tšireletso ea ho kena.Ka hare ho Hub hangata ke IP54; li-nacelles tsa leoatle le mehele e pepesitsoeng eaw slip hangata li hloka IP65 kapa ho feta. BonaTlhaloso ea litekanyetso tsa IPbakeng sa seo linomoro li se tiisang.
- Mocheso oa ho sebetsa.Maemo a tloaelehileng ke -40℃ho +70℃bakeng sa libaka tse ka leboea- tsa boemo ba leholimo, -20℃ho +60℃bakeng sa libaka tse itekanetseng, le condensation{5}e laoloang ho ea lebōpong la leoatle. Ho bata-mefuta e fapaneng ea boemo ba leholimo e hloka hore setlolo se netefatsoe ka mocheso o tlase.
- Mongobo.95 % RH ho se{1}}ho sa koaheloe ke bonyane bo tloaelehileng; bakeng sa libaka tse nang le condensation kamehla, ho futhumatsa ka hare ho ka 'na ha hlokahala.
- Letsoai-ho hanyetsa moholi.Li-turbine tsa lebopong le lebopong li lokela ho supa tlhahlobo ea IEC 60068-2-52 kapa ISO 9227 letsoai la ho fafatsa likarolo tsa tšepe le lihokelo.
- Ho thothomela.Li-profile tsa IEC 60068-2-6 tsa sinusoidal le 2-64 ke lintlha tse tloaelehileng tsa litšupiso; mofani oa thepa o lokela ho fana ka litlaleho tsa tlhahlobo, eseng likopo tsa ho bapatsa.
- Lehalima le ho phahama.Li-ring slip rings li lula tseleng e ka bonang maqhubu a lehalima a sa tobang. Surge ukumelana e lokela ho lumellanoa esale pele.
TheLenaneo la lipatlisiso tsa moea la US National Renewable Energy Laboratorye phatlalatsa litaba tsa bohlokoa- tse bonts'ang hore molumo oa molumo le lisebelisoa tsa motlakase li lula li le har'a maemo a holimo-a hlolehang{2}}lik'hamphani tse sebetsang - ke ka lebaka leo linomoro tsena tsa tikoloho li lokelang ho ba teng tumellanong, eseng boitlamo ba molomo.
Litšitiso tsa Mechini le Kopanyo
Merero ea Retrofit e hloleha ho lumellana le mochini hangata ho feta ts'ebetsong ea motlakase. Pele o fana ka tumello ea moralo, netefatsa:
- Bore bophara le bophara ba bokantle khahlano le enfelopo e fumanehang ka har'a hub kapa nacelle
- Tolerance ea shaft, runout, le concentricity allowance
- Tsela ea ho tsoa ka thapo (axial vs radial) le mofuta oa sehokelo - li-turbine tse ngata li na le radius e kobehang haholo ea cable
- Mounting flange pattern le torque arm anchoring
- Boima le ho leka-lekana bakeng sa likopano tse potolohang
- Mokhoa oa ho fumana litšebeletso - na setsebi se ka fihla fensetereng ea borashe ka turbine e boemong ba ts'ebeletso?
Ha e le hantle, bakeng sa merero e mengata ea ho khutlisa le ho matlafatsa matla, lithibelo tsa mochini li etsa qeto ea moralo pele tsa motlakase li etsa. Ke nakong eo kopano e lokisehang kapa e tloahelehileng ka botlalo e nang le kelello ho feta ho qobella karolo ea lethathamo la libuka hore e lekane.
Seo U Lokelang ho se Romela Mofani
RFQ e hloekileng e khutsufatsa potoloho ea quote ho tloha libeke ho ea ho matsatsi. Morekisi o hloka tse latelang kaofela ho rala kapa ho khetha selikalikoe:
| Sehlopha | Boitsebiso bo hlokahalang |
|---|---|
| Kopo | Tekanyetso ea turbine, mohlala (haeba o ka khona ho hlakoloa), sebaka (lebōpong/lebopong/maoatleng), moaho o mocha khahlano le retrofit |
| Mechini | Bore, bophara ba kantle, bolelele, sebopeho se ntseng se hola, lebelo la ho potoloha (tse tsoelang pele le tlhoro), ho tsoa ha cable |
| Lipotoloho tsa matla | Palo ea li-circuits, voltage, continuous and peak current, AC/DC, frequency |
| Lipotoloho tsa matšoao | Palo ea lipotoloho, protocol (CAN, Profibus, EtherCAT, Ethernet, analogue), sekhahla sa data, litlhoko tsa tšireletso |
| Earthing | Tsela e hlokahalang ea lefatše, boemo ba lehalima |
| Tikoloho | Boemo ba mocheso, mongobo, boemo ba IP, moholi oa letsoai-ha ho hlokahala, boemo ba ho thothomela |
| Tlhokomelo | Nako ea nako ea ts'ebeletso e lebelletsoeng, tebello ea bophelo ea borashe, litšitiso tsa phihlello |
| Litokomane | Litlaleho tse hlokahalang tsa tlhahlobo (HV e mamella, IR, khanyetso ea ho ikopanya, sefafatsi sa letsoai, ho thothomela), setifikeiti, data ea MTBF |
LBH
P: Sesepa sa Motlakase oa Moepo ke Eng?
K: Ke kopano ea motlakase e fetisang matla, matšoao a taolo, le data lipakeng tsa sebopeho se emeng sa turbine ea moea le karolo e potolohang - hangata e le rotor hub (bakeng sa taolo ea sekontiri) kapa, mecheng ea DFIG, mapheo a jenereithara a rotor.
P: Ke Hobane'ng ha Mehele ea Motlakase oa Motlakase oa Moepo o Fana?
K: Mekhoa e tloaelehileng ke ho putlama ha borashe le ho bokellana ha lerōle, ho phahama ha likhokahano ho tsoa tšilafalong kapa matla a tlase a selemo, ho hoholeha-ho hohoeng ha kutu, mokhathala oa ho sisinyeha ha cabling, le ho senyeha ha insulation. Tse ngata li etsahala butle-butle 'me li ka bonoa ka tlhahlobo e reriloeng.
P: Sesepa sa Wind Turbine Slip Ring se Lokela ho hlahlobjoa hangata hakae?
A: Ho hloleha ho utloahalang ke tlhahlobo ea pono ea selemo le selemo hammoho le ho hanyetsa ho kopana le ho hlahloba ho hanyetsa ho kenya letsoho; Mehele ea borashe ea jenereithara mochining oa DFIG hangata e hloka licheke tsa bolelele ba borashe likhoeling tse ling le tse ling tse 3-12 ho latela mosebetsi. Nako e nepahetseng e lokela ho latela bukana ea tataiso ea mofani oa thepa le kemiso ea tšebeletso ea turbine OEM.
P: Na Mehele ea Fiber Brush Slip e Betere ho Feta Brashi ea Carbon Bakeng sa Li-turbine tsa Moea?
K: Bakeng sa{0}makhotla a hona joale a tlase le likanale tsa data, ee - borashe ba faeba ha bo hlahise litšila 'me bo na le lerata le tlase haholo. Bakeng sa{{3}matla a holimo a hona joale kapa ho hlasimolla ha jenereithara, borashe ba k'habone kapa tšepe{4}ka graphite hangata ke khetho e ntle. Mehele ea sejoale-joale ea hub e sebelisa ka bobeli, ka likarolo tse arohaneng tsa kopano e le 'ngoe.
P: Na Ring e Tloaelehileng ea Slip ea Indasteri e ka Sebelisa Mohala oa Moepo?
A: Hangata ha ho na phetoho. Li-turbine li etsa hore ho thothomele, ho kokobetsa, moholi oa letsoai (mabōpong a leoatle), nako e telele ea litšebeletso, le sephethe-phethe sa motlakase se fetang tekanyo e tloaelehileng ea indasteri. Hoa hlokahala hore ho be le turbine{2}}mofuta o khethehileng oa lethathamo la likhalase kapa kopano e ikhethileng ka tloaelo.
P: Mofani oa Ring Ring ea Wind Turbine o Lokela ho fana ka litokomane life?
A: Bonyane: tlaleho ea tlhahlobo ea motlakase (HV e mamella, ho hanyetsa ho kenella, ho hanyetsa ho kopana), liphetho tsa tlhahlobo ea tikoloho (vibration, mocheso, sefafatsi sa letsoai haeba se le ka ntle ho lebopo), buka ea tlhokomelo e nang le mokhoa o hlalositsoeng oa tlhahlobo, lenane la likarolo tse setseng, le litifikeiti tsa thepa bakeng sa mehele le borashe.
Kakaretso: Tšoara Khetho ea Ring ea Slip joalo ka Qeto ea ho Tšepahala
Sesepa se nepahetseng sa turbine ea moea ke sona se ts'oanang le enfelopo ea motlakase ea turbine, e pholohang tikoloho ea eona, e lekana sebaka se teng sa mochini, 'me e ts'ehetsa moralo oa sebele oa tlhokomelo nakong ea lilemo tse 20. Boholo ba litjeo tsa ho fosahala ha li lefelloe ha u rekoa empa nakong ea ketelo ea pele e sa reroang{2}}tora.
Hlalosa litlhoko tsa motlakase, tsa tikoloho, le tsa mochini pele u bua le barekisi. Kopa litlaleho tsa liteko, eseng mapetjo. Arola litheknoloji tsa ho ikopanya le matla le matšoao hohle moo kopano e e lumellang. 'Me bakeng sa libaka tse lebōpong la leoatle kapa lebōpong la leoatle, nka kutu le ho tiisa ka botebo ho feta khetho ea thepa ea ho kopana - hangata letsoai le hlōla likhang pele borashe bo etsa joalo.