BL KHOA HOC VA CONG NGHE MO
7 NGHIEN Cl)U THUfNGHIEM SUTDUNG KIP VI SAI PHI DIEN TRONG DAO LO V A K H A I T H A C rni cnc M O hnivi LO VUNG QUANG NINH
KS. NONG VIET HUNG, KS. NGUYEN XUAN TRUONG, KS. N G U Y I N TRI THANG, KS. IRAN PHUC DjNH VA NNK
Vien KHCN Mo-Vinacomin
M
dt trong nhdng edng nghe nd min tien tiln hign nay dang dp dgng la cdng nghe nd min su dung kip vi sai phi dien. Phuong phdp nd min bdng kip vi sai phi dien dug'c coi Id phuang phap nd min dac trung va hieu qua nhlt khi nd min cae edng trinh cdn cd dp an toan, ehinh xac cao, giam thilu da qua ed, chin dgng cua vg nd tdi kit clu chdng cdng trinh, ddt dd vdng xa...Ddc dilm ndi bat eua edng nghg n l Id su dung ngdi nd phi dign ed thdi gian gian each khdc nhau, tgo nen thdi dilm nd khde nhau giiJa edc Id min, hdng min, lam tang hi^u qua pha vd da.
Nhu vay, ciJng vdi edc tiln bd khoa hoc ky thugt, cdc phuang phdp nd min eung nhu chung logi vdt ligu nd ngdy mdt tien tiln, an todn han eho phep edng tde khoan bin min trong khai thde khodng san gia tang mue dp an todn cho ngudi su dgng, giam thilu cdc tde ddng tieu cue din mdi trudng trong dao Id vd khai thac than dap ung mdt trong cdc tieu chi "Cdng nghe nd min than thien vdi mdi trudng".
1. Phuang phap nd min bdng kip vi sai phi dien Phuong phdp n l min bdng kip vi sai phi dien nhu tren hign nay dang duge su dgng khi bdn min pha vd dIt da tai edc md than Ip thien vung Quang Ninh, Thdi Nguyen, Lgng San vd mdt sd edng trinh khai thde vat ligu xdy dg'ng ed qui md idn. Cdng nghe phd da chu y l u dugc su dung ta[cac dudng Id md la edng nghe khoan nd min.
Di kieh n l cdc thdi thuoc nd trong mgng nd ngudi ta su dgng chat kich nd. Chdt kich nd thdng thudng Id kip n l .
Hign trong cdng nghigp khai tilde than hdm Id dang su dgng hai logi kip nd, dd la: kip vi sai dign vd kip vi sai phi dign. Kip no Id phuang tien kich n l , thudng dudC clu tgo bdng 3 phdn tu: hgt lua,
CfiNG NGHllP MO SO 5 - 2 0 1 4
bd phan lam cham hoac tdng lua vd dng nd. Kip n§
tao ra mdt sdng dp suit cao (sdng xung kich) gay nd khdi thudc nd chinh. Theo tdc dgng kich nd ban ddu cd kip nd tia lua, kip nd dien, kip n l dap. Theo thdi gian chdm nd, kip cd edc loai kip nd vi sai di?n va kip n l vi sai phi dien.
Kip nd vi sai dign la kip nd an todn him Id 6iigc su dgng rdng rdi d l nd min phd da, than trong cac md hdm Id Viet Nam. Kip nd vi sai phi dien gom dng nd vi sai miligidy vd dng nd ed chilu dai 2; 3; 5;
8; hoac 10 m (theo yeu clu cua ngudi su dgng) Dung d l gdy no thudc nd manh, thudc n l nhO tuang, day nd, dng ddn nd va cae phg lieu khac.
Dudng ddn nd ddi 3 m, dd bin cua ddy dan no l 18 kg. Kip nd phi dien vi sai do Vipt Nam san xull cd dac dilm khde nhau ddi vdi muc dich su dgng khdc nhau:
a. Doi vdn mo lg thien
-> Loai kip nd dung cho md Id thien, chilu d^i day ddn Id: 3; 6; 9; 12 m ed mau vang, thdi gian ehdy chdm danh djnh: 17; 25; 42; 100 m/s;
• Loai kip nd dung dua xudng Id khoan, chi^u ddi ddy dan la: 3; 6; 9; 12; 15; 18; 21; 24 m. Th|
gian chay chgm danh djnh: 200; 400; 600 m/s. | b. Doi vai mo ham Id
• Loai thudc n l dung trong h i m Id (khi khong cd khi bui nd), day ddn mdu do, chilu ddi ddy nfi:
3; 4; 5; 6 m;
• Cdu tao kip vi sai phi dign bao gdm 5 W phdn ca ban chinh hinh H.l.
Kip vi sal phi dign ed edu tgo nhu sau: MOt 6hii eua dng tin hieu kgp chdt vao kip nd nhd mOt niit kin. Trong kip nd cd mgt dng bdn din d l truyen cdc dign tieh tich tg trong dng ra than cua kip fi4 md khdng gdy ra tia lua dign. Dau kia duge b[t Wn tai xudng san xult d l trdnh hai am thdm nhdp v*i va gin vdi mdc chd J, the ghi thdi gian vi sai.
KHOA HOC VA CfiNG NGH| M O
H. 1. ciu tao CO ban cua kip nd vi sai phi dien o l ddp dng t i c dp iSdc Id bdng vd gilng
nghidng, gilng ddng. Id bdng trong qua trinh xdy dg'ng md mdi va md them khu vu-c khai thde trong cae md, ddi hdi phai ca gidi hod ddng bd tu khoan no min, xuc bde vdn tai din ehdng giu dudng Id.
Trong cde ndm gdn day nhilu md da Idp rap va dua vdo van hdnh bdng tai vgn chuyin da. Su dgng cdc may xuc Idt hdng, may xuc cdo va va cae phuang ti^n xuc bde edng suit Idn. B& ddp dng phuang tign, thilt bj xuc bde van tai ddc bigt la vdn tai bdng bang tai, ddi hdi cd hat dd phai dap ung kich thudc (^300 mm ddi vdi chilu rgng bdng tai 900 mm) bang tai va kieh thudc gau xuc eua mdy xdc dd. Trong khr do, edng ngh$ nd truyin thing su dgng kip n l vi sai dign chua ddp ung dugc mdt cdeh tri0t di. Su dyng kip nd vi sai dign Id phugng tidn n l hi$n dgi dup'c su dgng phd biln trong ngdnh md vd cdng trinh ngdm trudc khi kip nd phi di$n vi sai ra ddi.
Vdi kip nd vi sai di$n vi0e dau noi phuc tgp, kit qua n l phg thudc vdo:
• Dilu ki^n mdi trudng;
• Dilu ki^n ky thugt mdy nd min;
*> K9 thudt diu ndi vd kha ndng bao quan day kfp di$n khi diu nli, ddc bi^t muc dp an toan cua kip khi g ^ cdc sg' eo nhu va dap, tia lua, sdng kieh nd...
KHN diu ndi mang cdc lo min theo ndi tilp cudng dd ddng dign trong mgng khi ddng may nd min cd gid trj nhu sau:
l = -
r.n + ro + R (1)
Khi diu nli mgng n l min theo sa dd diu song song cudng d0 ddng di^n trong mgng tinh theo edng thde sau:
l = - + ro+R
(2)
Trong d6: E - Hi$u di$n t h i cua mgng, V; r - Dign trd cua k(p di$n vi sai, dm; n - S l kip di^n vi sai
trong mang nd, edi; ro - Dien trd ndi cua ngudn, dm;
R - Dign trd cua mang day ddn dign, dm.
Viec ddu ndi eac day kip vdi nhau trong mdi trudng md bj anh hudng do cac ylu td sau:
• Dp I m mdi trudng cd t h i do guang Id bj dot nude, cac mdi ndi bi "mat" rd ri dien;
• Day ddn bj va ddp Idm biln dang, dut nglm;,
• Cdc mdi nli tilp xue khdng chat, cd t h i bi rd;,
• Cae mdi ndi cd t h i bj sdt do dilu kien khdng du dnh sdng khi diu ndi...
Cde anh hudng tren anh hudng din higu qua nd min. Khi khdi nd cdng suit may khdng du <ll kieh nd, bd sdt Id...
• Sd luang Id min tren guang Id
Sd lugng l5 min tren guang Id phg thudc chu ylu vao dp bin nen, dp bin keo, tinh phdn liffp, tinh nut ne, dp md khe nut, dp I m eua da tirdn guang... Can cu vdo dg kien cd cua dA tirong guang, so lupng Id min dan vj dugc )de dmh theo H.M. Pakrovski nhu (3):
4-
(3)Trong do: n - S6 lypng 16 min. 16/ m^; f - He so dp kien c6, theo Protodiakonov; S - Dipn tich tilt dipn dydng Id, m^.
S l lypng 16 min trong gypng cdn phu thupc va kha nang pha da cua thulc n l (cdng suit no) hay lypng thudc n l dan vi _"q" cua mdi loai thulc n l sy dyng, vao chilu sau 16 min mil dpi n l , dipn tich tilt dien dydng Id. thdng qua bilu tiiyc
• Lypng thudc n l don v|
Lypng thulc n l dan vi dypc tinh theo cdng fhiic ciJa GS H.M. Pakrovski theo bilu thyc sau:
q = qi.fl.v.e.dn,kg/m'. (4) Trong dd; q, - Lypng thuoc n l dpn vj trpng phdng
thi nghipm; f, - Hp s l phg thupc vao clu true dIt da; V - H§ s l can n l ; e - H$ s l cdng n l cua loai thuoc n l ; d„ - H$ s l phu thuOc vao dydng kinh thoi thulc n l .
J«tmWNI|PIM8ti5-Z014
KHOA HQC VA C O N G N G H | M 6
Nganh than dang si> dung thuoc no P113 va thudc nd an toan khi bui nd AHi trong nu'dc san xu4t vdi SCFC cdng ph^ klidng cao, gia ca tu-ang do!
phu hp'p.
Cac nganh xay du-ng nglm giao thdng, thuy dien hi^n dang su- dung thudc'nd P.M 3151 vdi si>c cong pha Idn rat thuan ti$n cho viec phS da khi dg kien cd Idn.
S6 lu'gng lo khoan trong gu-ang 16. Xac dinh sd lu'gng Id khoan trong gu'ong 16 dao, thyc hien theo cdng thdc ctia GS. Pakrovski H.M. (5).
NG=(Nb+Nrf),(5) Nb.
fcVs^-B
q-Sd- C-Vs^-B^^
(6)
(7) Trong do: Nb - S6 lo khoan bien trong mpt tidn dp dao n6 min, lo; Nrf - S6 Id khoan tao rach trong chu ky, lo; Nc - T6ng s6 Id khoan tren gu'cng trong chu ky, lo; C - He sd phu thupc vao hinh dang du'ong Id dao; Tb - Khoang each giifa cac Id min bien, m; Sd - Dien tich tilt di^n 16 khi dao, m^; B - Chidu rpng cua du-dng 16, m; q - Lup'ng thudc n6 dan vj, kg/m , 70 - Chi phi thudc n6 cho 1 met dai Id khoan tren bien, kg/m; y - Chi phi thu6c n6 trung binh cho 1 met dai 16 khoan, liy bing:
y = (A,m,a,b), kg/m, (8) Trong do: A - M^t do thudc n l , T/m^; m - T h i tich
thuic n l tren 1 met dai Id khoan, liy bing:
m=0,785,d,^, m^; dt - Du'O'ng kinh thoi thuic, m; a - He s6 nap diy thuic; b - H§ so nen chat thuic trong Id khoan.
• Chilu sau 16 min trong chu ky
Trong thi cong dao Id, chieu sau 16 min phu thupc vao tilt dien du'ong Id, thilt bj thi cdng, tinh chit da, bilu d l t l chdc chu ky dao Id... Chilu sau 16 min qua Idn thuic nd khdng pha du'gc da hay pha huy sau dit da bao quanh bien tao nen sy thifa tilt dien, khong pha d l lai da nin lam cho viec su' dung 16 khoan thip hoac khdng du tilt dien SLf dung,
Chilu sau lo min do GS Pakrovski H,M d l xuit dugc xac djnh dya tren dien tich tilt dien Id dao nhu sau:
l = 0.5.Vs,m. (9)
•:• Lup'ng thuic n l cho mpt chu ky dao 16 Theo GS Pakrovski H, M. Lugng thuic n l tinh cho mpt chu ky dao 16 phy thupc v^o di#n tich dud'ng Id, vao chieu s§u Id min va lugng thuic n l dan vj... dugc x^c djnh theo cdng thuc (7):
Qt.t=q.Sd.nJ.kg. (10)/
Trong dd: I - Chilu sau (3 min, m; ii - H# so ^ dung Id min.
2. Hieu qua nd min bang kip dien vi sai trong cac mo h^m Id Viet nam
N l min bang kip dien vi sai la tiln bg kS? thuyit trong n l min pha da va n l min tao bien. Nlu so sanh vdi n l min bing kip dien tuc thdi thi hieu <0 glQ'a hai phuo'ng phap nd se r i t khac nhau. Hi^u qua n l min trong h i m Id ngoai sy phy thupc vao cac y l u t l CO' ban ma khi n l chju anh huo'ng nhu;
dp kien c l d i t da, muc do phan ldp, mi>c dp niX ne, mifc dp sung nuac cua da v.v...thi ylu t l anh hudng tryc tilp d i n hi#u qua nd la s i Jugng m^[
thoang klii n l min. Kip dien vi sai cd t h i tgo dupc cac mat thoang do thu" ty n l , sy chenh nhau bang miligiay ma kip dien tuc thdi khdng co dugc.
Mac du vay, theo ddi qua trinh n l min trong ttii cdng dao Id tai cac md than him Id Vi0t Nam khi su dyng kip dien vi sai thiy van co nhOng nhtrgiq dilm do la:
• Kich thudc cd hat da sau cac l i n n l khdng d i u nhau;
• Lup'ng da cd kich thud'e Idn hon kich thudc yeu c l u cua phuang tien van tai (chu yeu la van tai bing bang tai) nhilu, anh hudng den tudi thp ciJa bang tai va gay cac su c l dut bSng, hdng con lan...;
• He sd su dyng Id khoan khong ding diu, chl dat 75H-80 % (ddi khi thip han) chilu sau l6 min; ,,
• He so thCra tiet di0n cao > 10 %; •;
• Da sau khi n l vang xa, khi xuc may xuc phai danh lugng thai gian d l gom da lai, nen he so dSy gau xuc, giu keo khdng cao;
• Hien lup'ng bo Id, sdt Id phai xu ly min cam tuy khong thudng xuyen nhung van xiy ra...
N I min tao bien thyc su cd hieu qua khi sJ dung kip nd vi sai phi difn, do tao dugc cac m$t thoang, bdo tach da va Idp da thu$n Ip-i, khong l^m vao dudng bien thilt k l , vi vay nd min tao bien c6 nhij'ng uu dilm:
2.1. Wu diem
•> Giam dugc h# s i thu'a tilt dien, nhd do giam dugc chi phi xuc b i c vgn tai va cdng tac chen lip
sau khung ching, _
• Tang dp I n djnh dat da bao quang dudng 8 do it ldi Idm, giam bdt c^c vj tri ldi I5m gSy t ^ trung dng suit, giam hf sd can gid, ty khf dgc trfin cac vung Idm bien Id, do dd giam chl phi bSo du&ng dudng Id
• Dk it nut ne sau v^o ben trong khli dd, giSffl nhan cdng chen da sau khung chong, sau khung CftNGNBm|PMis65-20U
KHOA HOC VA CONG HGHE MO I^J
:h6ng dugc ch6n khft khdng gay cSc tac dOng eye 3d If n khung chong do dd giam su pha huy cu^c 3$ cua i>ng suit tap trung va tac dpng cua dp luc no. Khi su dyng cdc vi chdng nh? nhu neo, bf dng phun tdng tinh my quan cua dudng Id, gdp 3hln cai thifn dieu kien lam viec cho cdng nhan.
2.2. Nhuyc diem
*> o l nd min tao bifn dat hifu qua, khoang ::dch cdc l3 min bien phai dilu chtnh ngdn lai, tuc Id phai tang them sd l5 min bien tdm tang thf m thdi gian khoan, thdi gian n^p thudc no;
• Tdng chi phi cho cdng tac n l min, vd chi phi ca mdy nhat Id ddi vdi cac loai may cd gid cao, chi phi khau hao Idn;
• Tang thfm (khi cdn thilt) cdc lo trdng khdng nap thuic, lam tang thdi gian khoan va chi phi khoan;
• Ddi khi phdi thay ddi kich thudc Id khoan, lam thay dli va d6l h6i cac loai mui khoan dudng kinh nhd han, cd the chodng khoan phai thay loai dudng kinh nho han phii hgp dudng kinh l6 khoan Idm tdng thfm muc dO phi>c tgp trong b l tri vdt tu thilt bj khoan;
• Cd t h i phai thay ddi loai thuic nd, kich thudc thuic n l nhu dudng kinh thdi thudc nd;
• Khoang cdch cdc l5 khoan phai chinh xac han thi hifu qua tao bifn mdi tot, Tom lai nd min tgo bifn se t i n thdi gian va tdng kinh phi thi c6ng khoan, no,
2.3. Bu>&c dau ap dyng
Phuang phdp nd min bdng kip vi sai phi dien dugc coi Id phuang phdp nd min dac trung va hifu qua nhit khi n l min cdc cdng trinh cdn co dp an todn, chinh xdc cao,
Ddc diem no! bgt cua cdng nghe nd la su dyng ngdi no phi difn cd thdi gian gian cdch khdc nhau, tgo nf n thdi diem n l khdc nhau gii>a cdc 16 min, hdng min, ldm tdng hifu qua phd va da. Hf thing kich n l bing kip vi sai phi dien la qua trinh truyin tin hifu nd dugc thyc hifn trong dng nhya, D6 Id mOt Ing nhya cd cau tao hai Idp, phia trong dugc phu mft Idp bft hoat tinh. Khi dugc kich n l , Idp bft hogt tfnh bfn trong se dugc chuyin hod rit nhanh, lan truyen vdi tdc dO 2000m/s vd truyfn tin hifu din kip no. Dilm khdc biet nhau Id tgo nfn thdi glan gian cdch vi sai chlnh la clu tgo cua diu n l . Khi dugc khdi nd, sdng tin hifu n l dugc truyin tir l5 min khai n l va theo thu ty se truyfn din tlt ca cdc l5 min. Chlnh sy lan truyin song theo hudng 6\r\h sin dd tgo nfn sy va dfp qua lgi glOa cdc l5 min, hdng m)n vd dd lam tdng hifu qud v&ddpdd.
Nhu vdy, CLing vdi cac tiln bf khoa hgc ky thuft, cdc phugng phdp n l min cOng nhu chung
logi vat lifu n l ngay mdt tien tiln, an todn han cho phep cdng tdc khoan bin min trong khai thdc khoang san gia tdng muc ddar*-toan cho ngudi su dung, giam thilu cdc tdc ddng tieu cue d i n mdi trudng trong khai thdc than.
Phuang phdp nd min bdng kip vi sai phi dien nhu trfn budc diu dang dugc ap dung tgi cac dudng 16 dao trong da khong cd khi byi nd tai cac mo him 16 Quang Ninh dugc Cye An todn Bp Cdng Thuang kilm tra tardc khi cho phep dp dyng.
Kit qua dp dyng budc ddu cho thdy, hifu qua nd min dugc cai thifn dang k l , hf s i su dyng 16 min dgt 90-^95 %, khdng eo hifn tugng bo 16, da nd ra tai vyn, khdng cd dd qud cd, phii hgp vdi van chuyin bdng bang tai va giu xuc cua may xCic lat h6ng eung nhu edc loai may xuc khdc trong md hdm Id. Do dd, gdp phin ndng cao t i c do ddo cac dudng 16 da trong cdc md him id Quang Ninh.
Kit qua nghien cuu eua df tai c6 y nghta quan trpng ddi vdi ngdnh than Vift Nam, dilu do dugc t h i hifn qua cdc cht tif u:
2.4. 9 nghta khoa ht?c va thiec tien san xuat Wang cao trinh dp chuyen mdn va trinh dp nghien cdu dp dyng tien bp ky thuft md trong ITnh vyc khoan no min; md ra triln vgng che tgo va su dyng vft lifu hoa trong nude, gop phdn nang cao dp an toan, ndng suit lao dpng, nang cao t i c dp ddo Id dd hifn nay cua Tap dodn c6ng nghiep than khoan san Vift Nam gop phdn phdt trien nganh than.
2.5. Hieu qua kinh te xa hgi
Cac chi tieu ky thuat cua kinh t l cOa c6ng nghe nd min bdng kip vi sai phi difn thf hien qua cac thing ke:
• Hf s i su dyng lo min dat 904-95 %;
• Khong c6 hifn tugng n l bo 16;
• Kich thudc cd hgt <100 mm dgt 70^80 %;
• Kich thude ed hgt tCf 100-^300 mm dgt tCf 20^25 %;
• Kich thudc cd hat 300-^400 mm dat khoang 5
% thugn tifn cho van tai bdng bdng tai, xuc bic bing mdy xuc;
• Dd vang xa cdch guang 7^9 m, ding da n l chum thuan tifn cho xuc boc;
• Tde dp dao 16 cai thien dang ke, cac dudng 16 khdng bj ach t i c do xu ly min cdm, can phd da qud cd, thua tilt difn <10 %. Tic dp dao 16 tdng trung binh 204-25 %. Cd nhOng 16 gieng tdng tif 40-^45 m If n 55-^75 m
TriSn VQng dp di^ng. N l min phd dd Id c6ng dogn chua t h i thay t h i khi ddo Id trong dd, Mli nam ngdnh than ddo khoang trfn 100 km dudng Id dd, Su dyng kip vi sai phi difn do diu noi de ddng,
CdNG NGHIEP MO $05-2014
^ ^ _
KHOA HOC VA CONG NGHE MO chit lugng n l tin cay va dam bao nfn dugc cdcmd mong mudn SCF dung.
3. Kftluan, kifn nghj
Khi dp dyng kip n l vi sai phi difn mang Igi nhu'ng hifu qua va kit qua trong thyc tifn nhu sau:
• Giam dugc he sd thua tilt dien. Nhd do giam duge ehi phi xCic bic, van chuyin dit da.
• Dua kip n l vi sai phi dien vao trong Hdm Id phuc vu cdng tac nd min an toan, hieu qua, nang t i c dp dao Id. Nang eao tic do dao cac dudng 16 tren ca sd thilt bj hien c6 dang su dung.
Trong thdi gian tdi vife hoan thifn ap dung kip nd an toan vi sai phi dien cin dugc quan tam tren ea sd eae nghien cdu d'ng dyng nhu:
• Danh gid hien trang, hieu qua su dung kip n l vi sal difn va kip no vi sai phi dien trong san xuat than (khai thae, ddo 16 than, dao 16 da) tai Vift Nam.
• Nghien cifu, df xuit cac giai phap eong nghf trong ddo 16 vd khai thac su dung kip vi sal phi difn an todn tai cac mo than him Id Viet Nam.
• Nghifn cuu chl tao kip n l vi sai phi dien an todn vf khi, bui n l trong nudc d l ap dung rpng rai trong mgi dilu kifn mo c6 khi, byi n l cao.n
TA! LIEU THAM KHAO
1. Bui Danh Luu. Khoan nd min tgo bien. Neo trong dit da, Nhd xuat ban Giao thong Vdn tai. Ha Npi, Nam 1999.
2. Do Thuy Dang, V l phuang phap xae djnh s i lo min tren guong 16 bdng theo eae loat nd vi sai tao bien. Tgp chi Cdng nghifp Mo. Nam 2000.
3. Dao Van Canh. Nghien cuu hp ehilu khoan nd min hgp ly giam he s6 thifa tilt dien thuy difn laly. Nam 1995.
4. Vo Trong Hung. Some results of correcting geometry parameters for V-cut and Fan-cut holes In tunneling. Advances in mining and tunneling. Publishing house for sciene and technology. Hanoi. 2008.
5. TCVN 4586:1997. Vat lifu n l cong nghiep - Yfu cdu an todn ve bao quan, van chuyin va su dung. Ha Ndi, 1997.
6. TCN-14-06-2006. Quy phgm ky thuat an toan trong cac hdm 16 than vd diep thaeh. Bd Cong Thuang. Ha Ndi. 4/2007.
7. Thilt k l ky thugt nd min phi difn dp dung tai Cong ty than Quang Hanh, C6ng ty Him Id l-Clm Pha, C6ng ty than Hg Long, Cong ty than Hon Gai, Cdng ty than Ha Ldm, Cty than Uong Bi, Cong ty than Hing Thai... giai doan 2010-2014 tai cac md ham Id vung Quang Ninh,
Ngifoibien t$p: Vo Trgng Hung
The paper shows some study results 6 using the non electrical detonator for the underground construction driving and the coal exploitation in the underground mines in Quang Ninh province.
ANH HUDNG CUA BIEN TAN..,
(TiSp theo trang 38)
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Ngu'iyi bien tap: Dao Die Tao
Base on mathematic model analysis as well as simulation of 6kV inverters applied in the 6 kV power network at the open pit mines, the paper points out the advantages and disadvantages of inverters and their influence to the electric power qualities.
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