Surge Dziviriro Midziyo inoshandiswa kune emagetsi magetsi ekupa magetsi, nhare mbozha, uye kutaurirana uye otomatiki ekudzora mabhazi.

2.4 Iyo Kuvhiya Kudzivirirwa Mudziyo (SPD)

Iyo Surge Dziviriro Chigadzirwa (SPD) chinhu chemagetsi gadziriso yekuchengetedza system.

Ichi chishandiso chakabatana zvinoenderana padunhu rekugovera magetsi yemitoro iyo yainofanira kuchengetedza (ona Fig. J17). Iyo inogona zvakare kushandiswa pamatanho ese eanopa magetsi network.

Iyi ndiyo inonyanya kushandiswa uye inoshanda zvakanyanya mhando yekudzivirira kwekudzivirira.

Principle

SPD yakagadzirirwa kudzikisira kwenguva pfupi kukwira kwenzvimbo yemuchadenga uye kutsausa mafungu azvino pasi, kuitira kudzikisira ukuru hwekuputika uku kune kukosha kusiri kukuvadza pakuiswa kwemagetsi uye magetsi switchgear uye giya rekutonga.

SPD inobvisa kudarika:

• mune yakajairwa modhi, pakati pechikamu uye kwazvakarerekera kana pasi;
• nenzira yekusiyanisa, pakati pechikamu uye kwazvakarerekera. Muchiitiko chemhepo inopfuura mwero unoshanda, iyo SPD
• inoitisa simba repasi, nenzira yakafanana;
• inogovera simba kune mamwe mhenyu makondakita, munzira dzakasiyana.

Aya matatu marudzi eSPD:

• Tora 1 SPD

Iyo Type 1 SPD inokurudzirwa mune chaiyo kesi yebasa-chikamu uye maindasitiri zvivakwa, inodzivirirwa neyemheni inodzivirira system kana meshed keji. Inodzivirira kuiswa kwemagetsi pakurwisa kwakananga mheni. Inogona kuburitsa iyo yekumashure-yazvino kubva kumheni ichipararira kubva kune yepasi conductor kuenda kune network network.

Type 1 SPD inozivikanwa ne10 / 350 μs yazvino wave.

• Tora 2 SPD

Iyo Type 2 SPD ndiyo huru dziviriro sisitimu kune ese akadzika magetsi magetsi kuisa. Yakaiswa mune yega switchboard yemagetsi, inodzivirira kupararira kweanowanda magetsi mumidziyo yemagetsi uye inodzivirira mitoro.

Type 2 SPD inozivikanwa ne8 / 20 μs yazvino wave.

• Tora 3 SPD

Aya maSPD ane yakaderera kuburitsa inokwana. Ivo vanofanirwa saka zvinotenderwa kuiswa sechiwedzera kune Rudzi rwechipiri SPD uye padyo nemitoro yakaoma. Type 2 SPD inoratidzirwa nekubatanidzwa kwemagetsi mafungu (3 / 1.2 μs) uye mafungu azvino (50/8 μs).

SPD yakajairwa tsananguro

2.4.1 Unhu hwePSD

International standard IEC 61643-11 Edition 1.0 (03/2011) inotsanangura hunhu uye bvunzo dzeSPD dzakabatana neepasi magetsi ekuparadzira masystem (ona Fig. J19).

• Hunhu hwakajairika

- KANA_c: Maximum inoenderera inoshanda voltage

Iyi ndiyo AC kana DC voltage pamusoro iyo iyo SPD inova inoshanda. Iyi kukosha inosarudzwa zvinoenderana neyakatemerwa magetsi uye nehurongwa hwepasi kurongeka.

- KANA_p: Voltage dziviriro nhanho (paI_n)

Iyi ndiyo yakakwira magetsi kumatanho etemu ePSD painenge ichishanda. Aya magetsi anosvika kana iyezvino kuyerera muPSD kwakaenzana neni_n. Iyo voltage yekudzivirira danho rakasarudzwa rinofanirwa kunge riri pazasi pekuwedzera kwemhepo kumira kugona kwemitoro (ona chikamu 3.2). Kana zvikaitika kurohwa nemheni, iwo magetsi ari pamusoro pezviteshi zvePSD anowanzosara ari mashoma pane U_p.

- ini_n: Zita rekubuda parizvino

Iyi ndiyo yepamusoro kukosha kweiyo ikozvino ye8 / 20 μs waveform iyo iyo SPD inokwanisa kuburitsa gumi neshanu.

• Tora 1 SPD

- ini_imp: Impulse parizvino

Iyi ndiyo yepamusoro kukosha kweiyo ikozvino ye10 / 350 μs waveform iyo iyo SPD inokwanisa kuburitsa gumi neshanu.

- ini_fi: Autoextinguish tevera yazvino

Inoshanda chete kune yekuparara gwanza tekinoroji.

Iyi ndiyo yazvino (50 Hz) iyo iyo SPD inokwanisa kuzvikanganisa pachayo mushure mekupfura. Ino yazvino inofanirwa kugara iri hombe kupfuura inotarisirwa ipfupi-redunhu razvino panzvimbo yekumisikidzwa.

• Tora 2 SPD

- ini_Max: Kunonyanyisa zvinoerera zvino

Uku ndiko kukoshesa kwepamusoro kwerazvino kwe8 / 20 μs waveform iyo iyo SPD inokwanisa kuburitsa kamwe.

• Tora 3 SPD

- KANA_oc: Vhura-wedunhu magetsi anoshandiswa panguva yekirasi III (Type 3) bvunzo.

2.4.2 Main mafomu

• Yakadzika Voltage SPD

Midziyo yakasiyana kwazvo, kubva kune ese eetekinoroji uye ekushandisa maonero, anosarudzwa nezwi iri. Low voltage SPDs ndeye modular kuti iiswe nyore mukati meLV switchboards. Kune zvakare maSPD anochinjika kune zvigadziko zvemagetsi, asi izvi zvishandiso zvine yakaderera kuburitsa inokwana.

• SPD yekutaurirana network

Aya majaira anodzivirira nharembozha, akachinjisa maratidziro uye otomatiki ekudzora maratidziro (bhazi) kubva kune overvoltages anouya achibva kunze (mheni) uye ayo emukati kune magetsi magetsi network (inosvibisa michina, switchgear mashandiro, nezvimwewo).

Aya maSPD akaiswawo muRJ11, RJ45,… zvinongedzo kana kubatanidzwa mumitoro.

3 Dhizaini yemagetsi yekuisa yekudzivirira system

Kuchengetedza kuiswa kwemagetsi muchivako, mitemo yakapusa inoshanda kune sarudzo ye

• SPD (s);
• Inodzivirira system.

3.1 Dhizaini mitemo

Yesimba rekuparadzira magetsi, iwo maitiro makuru anoshandiswa kutsanangura mheni yekudzivirira system uye sarudza SPD yekudzivirira kuiswa kwemagetsi muchivako ndeiyi:

• SPD

- huwandu hweSPD;

- mhando;

- mwero wekuratidzira kutsanangura iyo yakanyanya SPD kuburitsa ikozvino I_Max.

• Iyo pfupi wedunhu dziviriro mudziyo

- yakawanda kuburitsa ikozvino I_Max;

- pfupi-redunhu razvino I_sc panguva yekuiswa.

Iyo logic dhayagiramu muMufananidzo J20 pazasi inoratidza iyi dhizaini mutemo.

Iwo mamwe maitiro ekusarudzwa kweSPD akafanorongedzerwa kumisikidzwa kwemagetsi.

• nhamba yematanda muSPD;
• voltage kudzivirira chikamu U_p;
• uchishandisa voltage U_c.

Ichi chidimbu-chikamu J3 chinotsanangura zvakadzama nzira yekutora sisitimu yekudzivirira zvinoenderana nehunhu hwekuisa, midziyo inofanirwa kuchengetedzwa uye nharaunda.

3.2 Zvinhu zveiyo dziviriro system

Iyo SPD inofanirwa kugara ichiiswa panotangira yekuisirwa magetsi.

3.2.1 Nzvimbo uye mhando yeSPD

Mhando yeSPD yekumisikidzwa pakatangira kuisirwa zvinoenderana nekuti mheni yekudzivirira yemheni iriko here kana kuti kwete. Kana chivakwa chacho chakakomberedzwa nemheni inodzivirira system (sezvazviri IEC 62305), Type 1 SPD inofanira kuiswa.

Kune SPD yakaiswa pamucheto unouya wekumisikidza, iyo IEC 60364 yekumisikidza zviyero zvinowisa pasi zvishoma kukosha kweanotevera maviri maitiro.

• Zita rekuti kubuda ikozvino I_n = 5 kA (8/20) μs;
• Voltage dziviriro nhanho U_p (pandiri_n) <2.5 kV.

Huwandu hwedzimwe SPDs dzekuiswa hunogadzwa ne:

• saizi saiti uye kuomarara kwekuisa ma bonding conductor. Panzvimbo dzakakura, zvakakosha kuisa iyo SPD kumagumo ari kuuya eese subdistribution yakavharirwa.
• chinhambwe chinoparadzanisa mitoro inonzwisisika kuti ichengetedzwe kubva kune inouya-kumagumo dziviriro mudziyo. Kana iyo mitoro ikawanikwa anopfuura makumi matatu emamita kubva pane inouya-yekupedzisira dziviriro chishandiso, zvinodikanwa kupa imwe yekuwedzera dziviriro padyo padyo sezvinobvira kune inonzwika mitoro. Izvo zviitiko zvekuratidzwa kwemasaisai zviri kuwedzera kubva pamamita gumi (ona chitsauko 30)
• njodzi yekubuda pachena. Panyaya yenzvimbo iri pachena kwazvo, iyo inouya-kumagumo SPD haigone kuona ese ari maviri kuyerera kukuru kwemheni kwazvino uye yakakwana yakaderera magetsi ekudzivirira mwero. Kunyanya, Type 1 SPD inowanzo kuperekedzwa neRudzi rwechipiri SPD.

Tafura iri mumufananidzo J21 pazasi inoratidza huwandu uye mhando yeSPD yekumisikidzwa pahwaro hwezvinhu zviviri zvinotsanangurwa pamusoro.

3.4 Sarudzo yeRudzi 1 SPD

3.4.1 Kufuridzira ikozvino I_imp

• Iko kusina mirawo yenyika kana zvirevo zvakanangana nerudzi rwechivakwa chinofanira kuchengetedzwa, Iko kushushikana kwazvino I_imp ichave ingangoita 12.5 kA (10/350 μs wave) pabazi rimwe maererano neIEC 60364-5-534.

• Iko kunowanikwa mirau: standard 62305-2 inotsanangura matanho mana: I, II, III uye IV, Tafura iri muMufananidzo J4 inoratidza akasiyana mazinga eI._imp mune yekutonga nyaya.

3.4.2 Autoextinguish tevera yazvino I_fi

Hunhu uhwu hunoshanda chete kune maSDD ane spark gap tekinoroji. Iko kudzima-auto kunotevera ikozvino I_fi inofanirwa kugara iri yakakura kudarika inotarisirwa pfupi dunhu razvino I_sc panguva yekuiswa.

3.5 Sarudzo yeRudzi 2 SPD

3.5.1 Kunonyanyisa kubuda zvino I_Max

Kuburitswa kwakanyanya ikozvino Imax kunotsanangurwa zvinoenderana neanofungidzirwa mwero wekuratidzira zvinoenderana nenzvimbo yechivako.

Iko kukosha kweakanyanya kubuda zvino (I_Max) inotsanangurwa nekuongororwa kwenjodzi (ona tafura muMufananidzo J32).

3.6 Sarudzo yekunze Pfupi Dunhu Dziviriro Chishandiso (SCPD)

Iyo yekudzivirira michina (inopisa uye yakapfupika dunhu) inofanirwa kuve yakarongedzwa neiyo SPD kuverengera kuvimbika kushanda, kureva

• chengetedza kuenderera kwebasa:

- kumira mheni dzemasaisai emheni;

- kwete kuburitsa yakawandisa yakasara voltage.

• chengetedza chengetedzo inoshanda pamarudzi ese ezvakawandisa:

- kuwandisa kuzoteedzera kupisa kweiyo varistor;

- ipfupi dunhu repasi kusimba (impedant);

- pfupi pfupi redunhu rakasimba.

3.6.1 Njodzi dzinofanirwa kudzivirirwa pakupera kwehupenyu hwePSDs

• Nekuda kwekukwegura

Muchiitiko chekupera kwehupenyu nekuda kwekukwegura, kudzivirirwa kuri kwerudzi rwekupisa. SPD ine varistors inofanirwa kuve neyemukati disconnector iyo inoremadza iyo SPD.

Tarira: Kupera kwehupenyu kuburikidza nekupisa kwakapisa hakune hanya nePSD negasi rinoburitsa chubhu kana rakaputirwa gara gwanza.

• Nekuda kwekukanganisa

Izvo zvikonzero zvekuguma kwehupenyu nekuda kwepfupi-redunhu kukanganisa ndezvi:

- Kunonyanyisa kubudiswa kugona kunopfuura.

Iko kukanganisa kunoguma mune yakasimba pfupi dunhu.

- Mhosho nekuda kwenzira yekuparadzira (kwazvakarerekera / danho switch, kusatsigira

kudamburwa).

- Kuwedzera zvishoma nezvishoma kweiyo varistor.

Iwo maviri ekupedzisira kukanganisa kunoguma neyakaganhurirwa pfupi dunhu.

Iyo yekumisikidza inofanirwa kudzivirirwa kubva kukuvadzwa kunobva kune aya marudzi ekukanganisa: iyo yemukati (yekupisa) disconnector yakatsanangurwa pamusoro haina nguva yekudziya, saka kuti ishande.

Chishandiso chakakosha chinonzi "zvekunze Pfupi Dunhu Dziviriro Chishandiso (zvekunze SCPD)", inokwanisa kubvisa iyo pfupi dunhu inofanira kuiswa. Inogona kuitiswa nedunhu mudariki kana fiyuzi mudziyo.

3.6.2 Hunhu hwekunze SCPD (Pfupi Dunhu Dziviriro Chishandiso)

Iyo yekunze SCPD inofanirwa kuve yakarongedzwa neiyo SPD. Yakagadzirirwa kusangana nezvipingamupinyi zviviri zvinotevera:

Mheni yazvino inomira

Mheni yazvino inomira yakakosha hunhu hwePSD yekunze Ipfupi Circuit Dziviriro Chishandiso.

Iyo yekunze SCPD haifanire kukwira pamusoro gumi neshanu anoteedzana ekumanikidza mafungu kuI_n.

Ipfupi-redunhu razvino rinomira

• Iko kutyora kugona inotsanangurwa nemitemo yekuisa (IEC 60364 standard):

Iyo yekunze SCPD inofanirwa kuve neyakaganhurwa inokwana kana yakakura kudarika inotarisirwa ipfupi-redunhu razvino Isc panzvimbo yekumisikidza (zvinoenderana neIEC 60364 standard).

• Kudzivirirwa kwekuiswa pamusoro pemaseketi mapfupi

Kunyanya, iyo impedant pfupi dunhu inoparadzira yakawanda simba uye inofanirwa kubviswa nekukurumidza kwazvo kudzivirira kukanganisa kuisirwa uye kune iyo SPD.

Kushamwaridzana chaiko pakati peSPD uye yekunze SCPD inofanirwa kupihwa nemugadziri.

3.6.3 Kuisa modhi yekunze SCPD

• Mudziyo "wakateedzana"

Iyo SCPD inorondedzerwa se "inoteedzana" (ona Fig. J33) apo dziviriro inoitwa neyakajairika dziviriro chishandiso chenetiweki kuti ichengetedzwe (semuenzaniso, kubatanidza wedunhu mudariki kumusoro kwerukova rwekuisa).

• Mudziyo "mukufanana"

Iyo SCPD inorondedzerwa se "in parallel" (ona Fig. J34) apo dziviriro inoitwa zvakanyanya nechidziviriro mudziyo unobatana nePSD.

• Iyo yekunze SCPD inonzi "kudimbura redunhu mudariki" kana basa racho richiitwa nemutambi wedunhu.
• Iyo yekudambura yedunhu mudariki inogona kana inogona kunge isingabatanidzwe muPSD.

Ongorora: Panyaya yeSPD ine gasi inoburitsa chubhu kana yakavharirwa gwanza, iyo SCPD inobvumira iyo yazvino kuti ichekwe ipapo mushure mekushandisa.

Ongorora: S mhando yakasara yazvino michina mukuenderana neIEC 61008 kana IEC 61009-1 zviyero zvinoenderana nechinodiwa ichi.

3.7.1 Kufambisa pamwe nemidziyo yekudzivirira yekumusoro

Kufambisa pamwe neanopfuura-azvino ekuchengetedza michina

Mune yekumisikidza magetsi, yekunze SCPD chishandiso chakafanana nemidziyo yekudzivirira: izvi zvinoita kuti zvikwanisike kushandisa rusarura uye matekiniki ekutsiva ehunyanzvi uye ehupfumi kugadzirisa ehurongwa hwekudzivirira.

Kufambisa pamwe nemasaisai azvino zvigadzirwa

Kana iyo SPD yakaiswa pasi pezasi kwechinhu chekudzivirira chekuvuza kwepasi, iyo yekupedzisira inofanirwa kunge iri ye "si" kana inosarudzika mhando ine hutachiona hwekudhiza mafungu einenge 3 kA (8/20 μs yazvino wave).

4 Kuiswa kweSPDs

Kubatana kweSPD kune iyo mitoro kunofanirwa kuve kupfupi sezvinobvira kuitira kudzikisa kukosha kweiyo voltage dziviriro nhanho (yakaiswa kumusoro) pane zviteshi zvemidziyo yakachengetedzwa. Hurefu hwese hwekubatana kweSPD kunetiweki uye yepasi terminal block haifanire kupfuura makumi mashanu emakumi mashanu.

4.1 Kubatana

Imwe yeakakosha maitiro ekudzivirira kwemidziyo ndeye yakanyanya voltage yekuchengetedza nhanho (yakaiswa U_p) iyo michina inogona kumira panzvimbo dzayo. Saizvozvowo, SPD inofanira kusarudzwa nemhepo inodzivirira nhanho U_p yakashandurwa kuchengetedzwa kwemidziyo (ona Fig. J38). Iyo yakazara hurefu hweiyo yekubatanidza ma conductor ndeye

L = L1 + L2 + L3.

Kune yakakwira-frequency masaisai, iyo impedance yeyuniti kureba kweiyi kubatana ingangoita 1 μH / m.

Nekudaro, kushandisa mutemo waLenz kune uku kubatana: =U = L di / dt

Iyo yakajairwa 8/20 μs yazvino wave, ine yazvino amplitude ye8 kA, nekudaro inogadzira kukwira kwemagetsi kwe1000 V pamamita etambo.

=U = 1 x 10^-6 x8 x10³ / 8x10^-6 = 1000V

Nekuda kweizvozvo voltage pamidziyo yemidziyo, yakaiswa kumusoro, ndeiyi:

ndakaisa U_p =U_p + U1 + U2

Kana L1 + L2 + L3 = 50 cm, uye wave iri 8/20 μs ine amplitude ye8 kA, iyo voltage pamidziyo yemidziyo inove U_p + 500 V.

4.1.1 Kubatana munzvimbo yepurasitiki

Mufananidzo J39a pazasi inoratidza maitiro ekubatanidza iyo SPD mune yepurasitiki yakavharirwa.

4.1.2 Kubatana munzvimbo yesimbi

Kana iri switchgear gungano mune yesimbi yakavharirwa, zvingave zvine hungwaru kubatanidza iyo SPD yakananga kune iyo simbi yakavharirwa, neyakavharirwa ichishandiswa semudziviriri conductor (ona Fig. J39b).

Iyi gadziriro inoenderana neyakajairwa IEC 61439-2 uye iyo ASSEMBLY inogadzira inofanirwa kuona kuti hunhu hweyakavharirwa hunoita kuti izvi zvishandiswe.

4.1.3 Kondakita muchinjikwa chikamu

Chikamu chakakurudzirwa chediki conductor muchikamu chinofunga nezve:

• Iyo yakajairwa sevhisi inofanira kupihwa: Kuyerera kwemheni yazvino wave pasi peyakanyanya magetsi donhwe (50 cm mutemo).

Ongorora: Kusiyana nekushandisa pa50 Hz, chiitiko chemheni kuva chakanyanya kuwanda, kuwedzera kweye conductor muchinjikwa chikamu hakuderedze zvakanyanya kukwirira-kwakawanda impedance.

• Iwo ma conductor anomira kune mapfupi-masekondi mafirita: Mufambisi anofanirwa kuramba pfupi-redunhu parizvino panguva yekukwirira yekudzivirira system cutoff nguva.

IEC 60364 inokurudzira pakumisikidza inouya kumagumo chidimbu chemuchinjikwa-chikamu che:

- 4 mm² (Cu) yekubatanidza Rudzi 2 SPD;

- 16 mm² (Cu) yekubatanidza Rudzi rwekutanga SPD (kuvapo kwemheni yekudzivirira system).

4.2 Mitemo yekabling

• Mutemo 1: Mutemo wekutanga kutevedzera ndewekuti kureba kwekubatana kweSPD pakati penetiweki (kuburikidza neiyo yekunze SCPD) uye yekuvharisa yekupedzisira block haifanire kupfuudza 50 cm.

Mufananidzo J40 inoratidza mikana miviri yekubatana kwePSD.

• Mutemo 2: ma conductor evachengeti vanobuda vanochengetedza

- inofanirwa kuve inofambidzana netemu dzekunze SCPD kana iyo SPD;

- inofanirwa kupatsanurwa panyama kubva kune vakasviba vanouya makondakita.

Izvo zvinowanikwa kurudyi kwetemu dzeSPD uye SCPD (ona Fig. J41).

• Mutemo 3: Iyo irikuuya feeder chikamu, kwazvakarerekera uye kudzivirirwa (PE) makondakita anofanirwa kumhanyisa mumwe padivi peumwe kuitira kudzikisa chiuno chepamusoro (ona Fig. J42)
• Mutemo 4: Iwo anouya maconductor eSDD anofanirwa kunge ari kure kubva kune vanodzivirirwa vanobuda ma conductor kudzivirira kuvasvibisa nekubatanidza (ona Fig. J42).
• Mutemo 5: Tambo dzinofanirwa kupetwa uchipesana nenhengo dzesimbi dzeyakavharirwa (kana paine) kuitira kudzikamisa kumeso kwetambo chiuno uye nekudaro kubatsirwa kubva pamhedzisiro yekudzivirira kukanganiswa kweME.

Muzviitiko zvese, inofanirwa kutariswa kuti mafuremu e switchboard uye yakavharirwa zvakavhurwa kuburikidza nekubatana kupfupi.

Chekupedzisira, kana tambo dzakadzivirirwa dzikashandiswa, marefu marefu anofanirwa kudzivirirwa, nekuti anoderedza kugona kwekudzivirira (ona Fig. J42).

5 Chikumbiro

5.1 Kuisa mienzaniso

Mhinduro uye dhizaini dhizaini

• Yekusimudzira yekusunga gwaro raita kuti zvikwanise kuona chaiyo chaiyo yeanosunga anosunga pamagumo ari kuuya ekumisikidza uye neayo anofambidzana nekudimbura wedunhu mudariki.
• Sezvo zvishandiso zvakaomarara (U_p <1.5 kV) inowanikwa anopfuura makumi matatu emamita kubva kune inouya yekudzivirira chishandiso, yakanaka yekudzivirira inosunga vanosunga vanofanirwa kuiswa padyo padyo sezvinobvira nemitoro.
• Kuona kuenderera kuri nani kwebasa kwenzvimbo dzemakamuri anotonhora:

- "si" mhando yakasara yazvino wedunhu mabhureki ichashandiswa kudzivirira kunetseka kwekugumburwa kunokonzerwa nekukwira kwesimba repasi apo mheni inopenya ichipfuura.

• Yekudzivirira kubva kumatenga ekuwandisa:

- isa inosunga inosunga mune huru switchboard

- isa inodzivirira yekudzivirira yekusungwa inosungwa mune yega switchboard (1 ne2) ichipa michina yakaoma iri pamusoro pemamita makumi matatu kubva kune anouya ekuwedzera anosungwa.

- isa inosunga inosunga pane nharembozha kuchengetedza zvishandiso zvinopihwa, semuenzaniso, maalarm emoto, modemu, nhare, fakisi.

Kabling kurudziro

- Simbisa iyo equipotentiality yekubvisa kwepasi kwechivako.

- Deredza iyo yakavharwa magetsi magetsi tambo nzvimbo.

Kuisa kurudziro

• Isa iyo inosunga yekusunga, Imax = 40 kA (8/20 μs) uye iC60 disconnection redunhu breaker yakarongwa pa20 A.
• Isa zvakanaka kudzivirirwa kwekusungwa vanosungwa, Imax = 8 kA (8/20 μs) uye yakabatana iC60 disconnection redunhu mabhureki akayerwa pa20.