bo cong thicong ong hoa xa roi c1111 nghia v1$t...

8
BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T NAM [lac lap - Ty do - Hanh phtic SO: f4 5 0 /QD-BCT Ha NOi, ngay 29 dicing 12 neim 2015 QUYET DINH viac phe duyat Quy hooch phat trien din hit tinh Bang Nai giai don . 2016-2025, c6 aft den nam 2035 - Quy hooch phat trien h thong din 110 kV BO TRIMING BO CC:VG THU'ONG Can cir Luat Dian lye ngay 03 thing 12 nam 2004; Luat saa di, be, sung in6t s6 dieu ctia Luat din lye ngay 20 thang 11 nam 2012; Can dr Ng14 djnh so 137/2013/ND-CF ngay 21 thang 10 nam 2013 elm Chinh phit quy djnh chi tiet thi hanh mat se dieu cim Luat din lye va Luat sin dal, ba sung mat s6 dieu cCa Luat din lye; Can dr Nghi djnh sa 95/2012/N1)-CP ngay 12 thing 11 nam 2012 cua Chinh pha quy djnh chire nang, nhiam vi, quyen han va cc cu t6 chile dm BO C6ng Thuong; Can dr Thong tu so 43/2013/TT-BCT ngay 31 thing 12 narn 2013 dm BO COng Thucmg quy djnh nai dung, trinh ty, tha tye lap, them dinh phe duyat va dieu chinh Quy hoach phat trien din lye; Xet de nghi eim US , ban nhan din tinh Bang Nai tai Tor trinh sa 8066/1'Tr- ngay 02 thang 10 nam 2015 ye viae them dinh va phe dityat de an Quy hoach phat trien din lye tinh DOng Nai giai don 2016-2025 ce xet den 2035 Hop phen I: Quy hoach phat trien ha thang din 110 kV; Van ban g6p cho an so 4971/EVNNPT-KH ngay 12 thang 11 nam 2015 cfm Tang Gong ty Truyen tii din quac gia, se; 9070/EVNSPC-KB ngay 09 thang 11 nam 2015 et Tang Ong ty Dian lye mien Nam; ha so b6 sung, hiau chinh De an do Vin Nang luong lap thang 12 nam 2015; Theo de nghi dm Tang cue truang Tang cyc Nang luong, QUYET DINH: Dieu 1. PM duyat Quy hoach phat trien din lye tinh Dang Nai giai doan 2016-2025 c6 xet den narn 2035 — Quy hoach phat trien ha thOng din 110 kV do Vian Nang luong lap voi cac nal dung chinh nhu sau: 1. Djnh htrung phat trien a) Dinh huong chung - Phat trien fuel (flan truyen tai va phin phai phai gin vOi dinh huong phat

Upload: duongtruc

Post on 07-Feb-2018

218 views

Category:

Documents


5 download

TRANSCRIPT

Page 1: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet

BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T NAM [lac lap - Ty do - Hanh phtic

SO: f4 50 /QD-BCT Ha NOi, ngay 29 dicing 12 neim 2015

QUYET DINH

viac phe duyat Quy hooch phat trien din hit tinh Bang Nai giai don . 2016-2025, c6 aft den nam 2035 - Quy hooch phat trien h thong din 110 kV

BO TRIMING BO CC:VG THU'ONG

Can cir Luat Dian lye ngay 03 thing 12 nam 2004; Luat saa di, be, sung in6t s6 dieu ctia Luat din lye ngay 20 thang 11 nam 2012;

Can dr Ng14 djnh so 137/2013/ND-CF ngay 21 thang 10 nam 2013 elm Chinh phit quy djnh chi tiet thi hanh mat se dieu cim Luat din lye va Luat sin dal, ba sung mat s6 dieu cCa Luat din lye;

Can dr Nghi djnh sa 95/2012/N1)-CP ngay 12 thing 11 nam 2012 cua Chinh pha quy djnh chire nang, nhiam vi, quyen han va cc cu t6 chile dm BO C6ng Thuong;

Can dr Thong tu so 43/2013/TT-BCT ngay 31 thing 12 narn 2013 dm BO COng Thucmg quy djnh nai dung, trinh ty, tha tye lap, them dinh phe duyat va dieu chinh Quy hoach phat trien din lye;

Xet de nghi eim US, ban nhan din tinh Bang Nai tai Tor trinh sa 8066/1'Tr-ngay 02 thang 10 nam 2015 ye viae them dinh va phe dityat de an Quy

hoach phat trien din lye tinh DOng Nai giai don 2016-2025 ce xet den 2035 Hop phen I: Quy hoach phat trien ha thang din 110 kV; Van ban g6p cho an so 4971/EVNNPT-KH ngay 12 thang 11 nam 2015 cfm Tang Gong ty Truyen tii din quac gia, se; 9070/EVNSPC-KB ngay 09 thang 11 nam 2015 et Tang Ong ty Dian lye mien Nam; ha so b6 sung, hiau chinh De an do Vin Nang luong lap thang 12 nam 2015;

Theo de nghi dm Tang cue truang Tang cyc Nang luong,

QUYET DINH:

Dieu 1. PM duyat Quy hoach phat trien din lye tinh Dang Nai giai doan 2016-2025 c6 xet den narn 2035 — Quy hoach phat trien ha thOng din 110 kV do Vian Nang luong lap voi cac nal dung chinh nhu sau:

1. Djnh htrung phat trien a) Dinh huong chung - Phat trien fuel (flan truyen tai va phin phai phai gin vOi dinh huong phat

Page 2: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet

trien kinh 4 - xa hoi cita vang va cüa timg dia phuong trong \rang, dam bao chat luqng dien va da tin cay cung cap dien ngay cang duqc na'ng cao.

Phat trien luoi dien truyen tai phai clang ba vOi tin da dim van van hanh cac nha may dien de dat dirge hi8u qua (Lau tu chung cita h8 thong dien quac gia va khu we; phü hcrp v6i chien luqc phat trien nganh dien, quy hoach phat trien dien lye va cac quy hoach Ichac cita vimg va cac dia phuang trong vimg. •

Phat trien Iuói dien 220 kV va 110 kV, hoan thien mang 1u6i dien thu vtic nham nang cao d'6 On dinh, tin cay cung cap en, giam thieu tan that dien nang.

Xay dyng cac throng day truyan tat then c6 dy phong cho phat trien lau dai trong tucmg lai, sir dung cat nhiau mach, nhien cap dien ap di chung tren mat hang cat a giam dien tich chiem tat. Dal vol cac thanh ph6, cac trung tam phy tai lern, so 6' luoi dien phai 06 di) dy trft va tinh firth hoat cao hcrn; thyc hien viec hien dai hi:5a va timg bu6c ngam hóa luOi dien tai cac thanh pha, thi xa, ban che tac clang x'au den canh quan, moi threw.

b) Tieu chi phat then lurfri dien 220 kV, 110 kV Cau trim luth dien: luth dien 220 kV, 110 kV dirge thiet 14 dam bao da

tin cay cung cap dien va chat Inca-1g dien nang trong che da lam viec binh tinning va sy c6 dcm le theo cac quy clink' hien hanh. Lath dien 220 kV, 110 kV phai dam bfro dy pheng cho phat trien a giai don 14 tiep.

DuOng day 220 kV, 110 kV: tru lien sir dung loai cat nhiau mach de giam hanh lang tuyen cac di/Ong day tat dien.

Tram bien áp 220 kV, 110 kV: dirge thiet 14 vOi eau hinh quy mo ten hai may bien áp.

Tiet.dien day dart: + Cac dubng day 220 kV: sir dung day clan tiet dien 400 mm2 hoc day phan

pha c6 t6ng tik 600 mm2, c6 du phOng cho phat trien 0 giai doan ke tiep;

+ Cac clueing day 110 kV: sir dung day dan tiet dien 240 mm2.

Gam may bien áp: sir dung gam may bien áp cOng suat 125, 250, 375 MVA cho cap dien áp 220 kV; 40, 63 MVA cho cap dien áp 110 kV; di v6ri cac tram phu tai cita lchach hang, gam may dt tay theo quy mei cong suat sir dung. Cling suat cu the timg tram duct chon phi' hop vei nhu cau ding suat va dam bao che da van hart birth thuong mang tai 75 % &Ong suat dinh mire.

Ha trq cap en giera cac tram 110 kV duqc thyc hien bang cac dubng day mach wing trung the 22 kV.

c) Tieu chi phat trien hied dien trung áp Dinh luthng xtly dyng và cai to lueri dien: cap dien áp 22 kV dirge

Page 3: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet

chuan boa cho phat ti-in luoi dien trung áp trén tha ban tinh. - Cau trite lugi dien:

+ Khu vqc thanh ph6, khu de th1 mot th1 XL thj tin va cdc h0 ph u tai quan tun, lugi dien dugc thiet ke mach yang, vdn hanh h8.; khu vrc n8ng then, Itrai (lien duqc thiet 14 birth tia.

+ Cac &bug two trung the mach Wing & che 40 lam viec binh thuemg mang tai dr 60 - 70% so vei clong suat mang tai cuc dai cho phdp cfla day dark

+ Tai khu vitt thenh phO, th1 xA, th1 tran va khu trip dOng dan cu, cdc nhanh re cap then cho tram bien áp c6 the sir dung cap ngam hoc cap bqc each dien, cap In xoin ten kh6ng de bao dam an toan va m quan 48 tilt.

- Tiet dien day dlt: + Khu vqc nOi thanh, noi th1, khu 48 tin' mai, khu du lich, khu c8ng nghiep:

Throng true: Sir dung cap ngitm hoc cap treo XPLE tiet dien > 240 nun2 hoc due:mg day ten Ichong day nhom lOi thep b9c each dien tiet then> 150 mm2;

Cac nhanh re: Sir dung cap ngam XPLE hoc day idiom 181 thep b9c each dien vai tiat din? 95 mm .

+ Khu vqc ngoai thanh, ngoai thi va ruing than:

Duemg truc: Sir' ding day nh8m 181 thep c6 tiet dien 120 nun2;

Duemg nhanh chinh: cAp dien 3 phavà mOt pha cho XL them, x6m dung day nheiml8ithep c6 tiet dien 70 mm2.

- Gam may bien áp phan phei: + Khu vqc thanh pha, thi x5, 48 th1 mai, thi tan sir thimg cdc may bien áp

ba pha co gam c8ng suat tit 250 kVA-r750 kVA; x + Khu vuc pang th8n, sir dung cac may bien áp ba pha co gam cling suat tu

100 kVA+630 kVA; + Cac tram bien áp chuyen ddng ctia khdch hang duqc thiet ke pha h9p ved

quy mo phu tai. 2. Myc tieu a) Phat trien dOng b0 luai then truyen tai vã phan phi& ten clia ban Tinh

dap (mg mu° tieu phat trien kinh te xd het oh dja phucmg v8i tac 40 fang truemg GRDP trong giai doan 2016-2020 la 8-9 %/n5m, giai doan 2021-2025 la 8,5-9,5 %/nAm, giai doan 2026-2035 la 9-10 %/nam. Cu the nhu sau:

- NAm 2020: Cang suat cue di P„,ax = 2.650 MW, then thucmg pham 17.527 trieu kWh.

Tee 40 tang throng dien thuong pham birth quan hang nam giai doan 2016-2020 la 9,6 %/natn, trong 46: Cong nghiep — Xay dung tAng 9,1 %/nAm; Nang — Lam

3

Page 4: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet

Thay san tang 15,8 %/nam; Thucmg mai — Dich vct tang 15,3 %/nam; Quan lY Tieu clang dan cu tang 10,4 %/nam; Hog deng khac tang 11,4 %/nam. Dien

nang thucmg pham binh quan dau nguati la 5.460 kWhingueri/nam. Nam 2025:

Cling suat cue dai P.= 4.100 MW, dien thuong phalli 26.786 trieu kWh. Tac de tang trutrig dien thucmg pham binh quan hang nam giai doan 2021-2025 la 8,9 %/nam, trong do: Cong nghiep — Xay clung tang 8,4 %/nam; /gong — Lam

Thay sari tang 12 %/nam; Thucmg mai — Dich vçt tang 18 %/nam; Quin ly — Tiou ding dan cu tang 9 %/nam; Hog &Ong lchic tang 12,4 %/nam. Dien nang thucmg pham binh quail du nguai la 6.619 kWhingueri/nAm.

Nam 2030: Cong suat cut dai Pmax = 5.800 MW, dien thucmg pham 38.501 trieu kWh.

TOc de tang truang dien thuong pham blnh quan hang nam giai doan 2026-2030 la 7,5 %/nam, trong do: COng nghiep — Xay dung tang 7,5 %/nam; Nang — Lam

Thay san tang 8 %/nam; Thucmg mai — Dich vu tang 13 %/nam; Quan 1 — Tieu clang dan cu tang 6,7 %/nam; Heat deng khac tthig 8,5 %/natn. Dien nang thucmg pham binh quan dau nguesi la 8.370 kWhinguenam.

Nam 2035: Cong suat vire dai P,„„„ = 7.900 MW, dien thucmg pham 52.414 trieu kWh.

Toe de tang twang dien thuong pham but quan hang nam giai clop 2031-2035 la 7,5 %/nam, trong do: Cong nghiep — Xay dung tang 6,2 %/nam; N6ng — Lam — Thay sari tang 6,5 %/nam; Thucmg mai — Dich vu tang 9,8 %/nam; Quan lY — Tien dang clan cu tang 6,2 %/nam; Hoat deng khac tang 7,8 %/nam. Dien nang thircmg pharn binh quan du ngueri la 10.277 kWhingubi/nam.

Tang hqp nhu cau dien curl ccic thcinh phan phy thi cluvc trinh bay chi tiet trong Phy lye I kern theo.

Dam bao cung cap dien an toan, tin cay dam bao phat then kinh t4 chinh tri va an sixth id hei.

Xáe dinh phucmg an tau ned caa cac nha may dien trong Tinh vao thong dien quac gia, dam bao khai thic hqp IY nguOn dien trong yang va On dinh he thong dien khu vuc.

3. Quy ho#ch phat trien di0 Quy mo, tien xay digig cac hang num ding trinh throng day va tram hien

ap theo cac giai doan quy hooch nhu sau: a) Lueri dien 220 kV: - Giai dean 2016-2020:

4

Page 5: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet

Tram hien ap: xay dung mm1 tram bien ap 220/110 kV, cang suAt 250 MVA; cai tao, ma rOng nang quy m6 ding suAt 3 tram bin áp 220/110 kV \rod tang ding suAt tang them 875 MVA.

Throng day: xay dung mai 5 duang day 220 kV mach kep, chieu dai 56

- Giai doan 2021-2025:

Tram bien áp: xay dung mai 5 tram bien ap 220/110 kV, Gong sat 1.750 MVA; cal tao, m& r6ng nang quy mO c6ng suat 2 tram bien áp 220/110 kV v6i thing ding suAt tang them 375 MVA.

Buimg day: xay dung moi 6 duang day 220 kV voi tang chieu dai 162 km.

- Dinh huang giai doan 2026-2030: Tram bin xay dtmg mai 3 tram bien ap 220/110 kV, clang suAt

1300 MVA; cai tao, ma rang nang quy mo ding sutt 4 tram bien áp 220 kV voi tang ding suit tang them 1.000 MVA.

+ Du?nig day: xay dung Sri 4 throng day 220 kV vai tang chieu dai 39 km. - Dinh huerng giai doan 2031-2035: + Tram bien áp: xay dtmg mai 3 tram bien ap 220/110 kV, tang ding suAt

1.500 MVA; Cal tao, ma r6ng 'fang quy mo cang suAt 2 tram bin ap 220 kV yeti tang ding sat tang them 500 MVA.

+ Duang day: xay dung mai 4 duang day 220 kV voi tang chieu dai 11 km.

b) Luoi dien 110 kV: Giai doan 2016-2020:

+ Tram bien ap: xay dtmg mm 22 tram bien ap ,c110 kV vai tang ding stiAt 1.390 MVA; cal tao, ma r6ng nang quy mo c6ng suat 15 tram bien áp 110 kV voi tang ding suAt 950 MVA.

Duang day: xay dung mai 30 duang day 110 kV vai t&ng chieu dai 255 km; cai tao, na'ng kha nang tai 7 dueing day 110 kV vai tang chieu dai 109,6 km.

Giai doan 2021-2025: Tram bien áp: xay dung mai 17 tram bien ap 110 kV vdi tang Gong suAt

887 MVA; cal tao, mdr Ong nang quy mo cOng suAt 33 tram bien ap 110 kV vai tang cOng seat 1.963 MVA.

+ Dining day: xay dung mai 17 dtrang day 110 kV vai tang chieu dai 58,1 km; cai tao, nang kha nang tai 2 duemg day 110 kV voi tang chieu dai 58 km.

Dinh hueng giai doan 2026-2030:

5

Page 6: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet

Tram bin ap: xay dung mei 11 tram Men ap 110 kV ved tang &clog suat 1.386 MVA; cai tao, m& reng nang quy m8 Gong suat 14 tram bien ap 110 kV veri tong cang suet tang them 876 MVA.

Duang day: xay dung 15 duerng day 110 kV yeti tOng chieu dai 56 km. Dinh hthing giai doan 2031-2035:

+ Tram bien ap: xay dung moi 26 tram bien ap 110 kV \red tang cong suat 3.412 MVA;

+ Duemg day: xay dung 30 throng day 110 kV \Teri tang chieu dai 150 km. Danh myc ecie cong trinh duemg tidy, tram ban áp 220, 110 kV vao van

hanh giai dogn 2016-2025 chi tilt trong Phy lye 3; giai clogn 2026-2035 trong Phy lye 4; so. da elk nai tgi ban visa D709-DN-HPI-01, D709-DN-HPI-02 trong Ha sa de' an quy hogeh.

c) Lu6i di'en trung áp giai doan 2016-2025: Tram bien ap: Xay dung m6i 2.168 tram bien ap phan phOi 22/0,4 kV yeti tang dung

lugng 869.050 kVA; Cal to din áp va nang ding suat 2.819 tram bien ap vesi tang dung

luqng 1.460.431 kVA. Duemg day: Xay dung m&i 1.658 km dub/1g day 22 kV; Cal Lao 907,3 km duting day 22 kV;

d) Khai lugng luoi dien ha ap giai doan 2016-2025: Xay dijng m6i 2.399 km, cai tao 3.140 km duang day ha ap.

- COng to: 1ap dat meri vã thay the 227.500 cong to. Dray din trung va hg dp sie duce xcie clinh chi :left trong Quy ,hogch chi tilt

phcit ti-Mn lithi dien trung va hg ap sau eac ti-gm 110 kV (Hop phan II) caa Quy hogch phat Iran din lye tinh &Mg Nat giai dogn 2016-2025 ea xet din ndm 2035.

e) Nang lucmg tái tao: Xem xet dau tu 3 du an thuy din nhe (Phil Tan 1, PM Tan 2, Thanh

Son) ten co ses danh gia hieu qua kinh te va Mc dOng m8i throng. Xem xet img dung nang luvng sinh khai, nang 1uqng khi sinh hoc, nang

lugng rac thai d phat din tai the khu \Tigre c6 tiem nang. f) Van clan tu thuc hi'en quy hoach: Giai doan 2016 - 2025 tang van du ti xay mai, di tao the cong trinh lath

din c6 cep din ap tir 220 kV trer xuang den luesi din trung ap u6c tinh IA 17.511 ty ding.

Trong do: + Lu6i 220 kV: 4.778 ty ding;

6

Page 7: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet

+ Ltrei 110 kV: 6.721 t9 clang;

+ Lu6i trung, ha áp: 6.012 t9 dang.

Dieu 2. TO chat thirc hien: 1. U9 ban nhan dan tinh Deng Nai tã chfrc &Ong 1)6 quy hoach, chiu trach

nhiem gianh quy dat cho cac Gong trinh trong quy hoach d dugc phe duyet, chi dao SO COng Thucmg Deng Nai tó chfre trien khai lap quy hoach ph& trien din We tinh Deng Nai giai don 2016-2025, c6 'cot den nam 2035 Hap phan II: Quy hoach chi tiet phat trien luai din trung va ha áp sau cac tram 110 kV a chart xac ltrod din phan phei den timg cap xa, chuAn xac quy mO, tien dO cai tao trung áp nham tiet Iciem von dan tu va giam tan diat din rang.

Giao Tap doan Din lyc Via Nam, Tang ding ty Truyen tai din QuOc gia, Tong ding ty Din We mien Nam va cac nha dau tu phai hqp vgi cac ca quan chik narig tinh Dang Nai dê tO chire thyc hien quy hoach. Trong qua trInh clau tu xa'y dimg cac ding trinh kith din truyen tai va phanhphei, cie don vi din lye pith• man thil clang eau true ludi din, guy me VA cap din di) dugc phé duyet; tuen tha Quy dinh h thang din truyen tai va Quy dinh h'e theng din phan phai da thrge ban hart.

3. Set Gong Thucmg Dang Nai chi dao don vi tu van lap de an, hoan thin De an quy hoach theo dung the nOi,clung dugc phe duyet trong Quyet dinh nay va giri Ho sa De an da hoan thin ve Tang cue Nang lugng — BO COng Thuang, U9 ban nhan dan tinh DOng Nai, Ser COng Thucmg Deng Nai, Tap doan Din lyc Viet Nam, Tong ding ty Truyen tai din QuOc gia, Tang ding ty Din lyc mien Nam, COng ty TNHH MTV Dien lyc Ding Nai de quan 19 va thyc hien. sar C6ng Throng Deng Nai c6 trach nhiem theo del, Idem tra, quart 19 thyc hien Quy hoach cid dugc duyet.

Dieu 3. Chanh Van phOng BO, TOng,eye tithing Tang eye Nang lugng, Chit tich fJy ban nhan dan firth Deng Nai, Tong giam dee Tap doin Dien lye Via Nam, Tong giarn cicic Tong ding ty Truyen tai din QuOc gia, Tong gidm doe Tang cOng ty Dien lye mien Nam, Giant doe COng ty INHH MTV Dien lye Dang Nai va ca.° ca quan lien quan c6 trach nhiem thyc hien Quyet dinh nay./.

nhgn: - Nhu Dieu 3; - B8 MDT; - UBND tinh Dang Nai; - Set ang Thuong D6ng Nai; - Tap dean Dien lye-Viet Nam; - TOng c6ng ty Truyen tai dien QuOc gia; - Ding c8ng ty Dien lye mien Nami - COng ty TNHH MTV Dien lye E/ong Nai; - Vin Nang hung; - Ltru: VT, TCNL (ICH&QH-thg).

bang QuOc Vircrng

7

Page 8: BO CONG THICONG ONG HOA XA ROI C1111 NGHiA V1$T …sct.dongnai.gov.vn/SiteAssets/Lists/Dost_ChuyenDeMoi/EditForm/... · cac nha may dien de dat dirge hi8u qua ... lugi dien dugc thiet