TCN 68-146:1995

L a i NOI DAU

TCN 68-146:95 diro'C xay dung tr§n cc sd cdc khuy^n nghi cia CCITT, vk tieu chu^n Ngknh TCN-125-88.

TCN 68-146:95 thay M cho ti^u chuan TCN-125-88.

TCN 68-146:95 do Vi€n khoa hoc ky thu^t Bviu dien bi€n scan, V\j Khoa hoc Cong n§h6 vk Hop t^c Quoc te dl nghi vk dvroc Tong cue tnrd'ng Tong cue Buu di8n ban hknh theo quyet dinh so 1035/QD-KHCN nghy 1 th^ng 8 nam 1995.

TCN 68-136:1995 dirge ban hknh diing vko dip k ^ nigm 50 nam ngky thknh lap ngUnh Biru dien (15/8/1945 - 15/8/1995).

TCN 68-146:1995

MUC LUC

Trang

Ld"! ndi d§u 1

1. Pham vi ip dung 3

2. Thuat ngU 4

3. Cic chi tieu dich vu, chSt lu'cyng phuc vu

3.1 Cdc chi tieu dich vvi dCi vc i cdc thu8 bao 5 3.2 Kha nang lu'u thodt cua he thdng 5 3.3 Mu^c phuc vu 6 3.4 Tinh kha dung 8 3.5 Dinh tuyen vk lira chpn 9 4. Cdc chi tieu vg truy^n dan 4.1 Cdc chi tieu ve truyen din cua cdc 9

giao dien tu'cvng tir hai dSy 4.2 Cdc chi ti§u ve truy§n din cua cdc 10

giao dien tuang tir bon day 4.3 Cdc chi tieu truyen din cua cdc trung k8 s6 11

5. Cdc chi ti§u ve bdo hi6u 5.1 Chi tieu v^ cdc tin hieu thong bdo 12 5.2 Chi ti^u ve tin hi8u chuong

15 5.3 Tin hieu tinh cucyc tii xa 14 5.4 Chi tieu v8 cdc tin hiSu dia chi 14 5.5 Chi tieu bdo hiSu trung k^ giu*a cdc tong dki 15

6. Kha nang ddp ifng cua tong ddi vcyi cdc loai du'O'ng day 6.1 Vai du&ng day thue bao 15 6.2 Vdi du-d-ng day trung kl 15

7. Chi tigu vh nguon dien vd moi tru-o-ng 1dm vi$c 7.1 Chi ti^u ve nguon di8n ;16 7.2 Moi trird'ng 1dm viec cua tong ddi 16 7.3 Bko vg dud-ng dSy diu vdo tong ddi 16

TCN 68-146:1995

TIEU CHUAN NGANH TCN 68-146:1995

T6ng d^i s5 dung lircrng nho •V

Yeu cau ky thuat

Small Digital Excliange - Technical Standard

1. Pham vi ^p dung

TiSu chuSn nky dilng cho c^c tong d i di6n tu dung luo-ng nh6 (ti> 128 dSn 1 024 so) sii" dung l^m tong dki npi hat, chuyen tilp nhtrng khdng ph^i 1 tong dki trung t m c^p I cia mang vien thong Viet nam. •

Ti6u chu^n n^y l^m co s^ cho vi6c : - lira chQn tong dM di8n tii- s6 dung lucrng nh6; - do ki^m tra d£inh gid chSt luo-ng thilt bi.

2. Thuat ngu

TCN 68-146:1995

STT Tiing Anh TiSng Viet 1 Basic services Cdc dich vu co^ b^n 2 Recorded annoucement Cdc thong bao da dutyc ghi

o rv^

3 Payphone service am Dich vu dien thoai tir dong nh§n tien ci!ia khdch hkng

4 Malicious call trace Dich vu truy tim cupc gpi phd

5 Interception of calls service Dich vu ban che clc cuoc goi 6 Interception of calls service Dich vu han ch§ cdc cuoc goi 7 Absent-subscriber service Dich vu thue bao di vang 8 Supplementary services Cdc dich vu phu 9 Abbreviated dialling Dich vu quay so tat 10 Call diversion Dich vu chuyen cuoc gpi 11 Alarm call service Dich vu bdo thifc 12 Call vv^aiting Dich vu doi cuoc gpi 13 Immediate call charge Dich vu thong b^o cirac cupc

annoucement gpi ngay l^p tiic 14 Hot-line service Dich vu du-ang day n6ng 15 Conference service Dich vu hoi nghi 16 Call charge indicator at the Chi thi cuc^c cupc gpi tai cdc

subscribers premises nh^ thue bao 17 Grade of service Mifc phuc vu 18 Dial tone sending delay Tre giri am mm quay so 19 Availability Tinh kh^ dung 20 Routing and selection Dinh tuyen vk lira chpn 21 Exchange impedance Trd- khdng t6ng dki 22 Return loss Suy hao phan xa 23 Longitudinal conversion loss Suy hao m it can bang v§ dit 24 Dial tone Tin hi^u md-i quay so 25 Busy tone Tin higu bio ban 26 Congestion tone Tin hieu if dong

TCN 68-146:1995

3. Cdc chi tieu dich vu, chtt lircyng phuc vu

3.1 C^c chi tiSu v§ dich vu doi vc i c^c thu8 bao

3.1.1 C^c dich vu ccr b^n : a) dich vu thu€ bao quay s6 tii 'ddng goi noi hat, dudng d^i v^ quoc ii dirofc t6iig dki tir dong ghi cuuc LAM OZ vk in ra h6a dcyn; b) goi td'i ode di^n thoai vi8n dk:

- h6 tro thiSt l^p cuoc goi trong trird'ng hap khong quay so tij dong diroc;

- ho tro" thiet l^p cuoc goi trong trird'ng hop quay so tii dOng dirac nhirng g^p kh6 khan; - dua ra cdc th6ng tin c^n thilt;

c) ^oi t(9i cic thong b^o duac ghi §m cho c^c muc dich cung ctp thonig tin; d) goi tdi cSc dich vu cong cpng nhuf : C6ng an, cif u h6a, c£p ciru,;,. e) dich vu di6n thoai tir dOng nhSn tiln ciia khdch hkng khi goi; f) dich vu truy tim cuoc goi phd roi; g) dich vu han ch6 c^c cuoc goi; h) dich vu thue bao di vang.

3.r.2 C ^ dich vu phu : a) dich vu quay so tat; b) dich vu chuy^n cuoc goi; c) dich vu b^o thifc; d) dich vu dm cu^c goi; f) dich vu thong bdo cu-d c cuoc goi ngay l$.p tifc; g) dich vu dirong day ndng; h) dich vvi 'hoi nghi; i) chi thi cuc^c cuoc goi tai cdc nhk thu8 bao.

3.2 Kh^ nang lu-u tho^t cua h$ thdng

3.2.1 Tki chuan a) Tki chu^n A bilu thi mifc tki binh third-ng mh Biru diSn dkp

ifng du-o-c tren du-dng day thuS bao v^ tr^n dird'ng trung k6, b) Tai chuin B bi^u thi mifc tki tang vu'O't qud mifc binh third-ng

mk Biru dien ip ifng dtrgc tr^n du-d-ng dsiy thu8 bao vk tr8n duofng trung ke.

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TCN 68-146:1995

3.2.2 Tai trSn cdc dudrig trung kS a) Tai chuan A :

- 0,7 Erl; -'fhdi gian chi^m giiJ trung binh Ik 55 gi^y.

b) T^i chujin B : - 0,8 Erl; -.BHCA = 1,2 X BHCA cua t^i chuan A.

3.2.3 Tai tr^n c4c dird'ng dSy thue bao s5 hoac tircrng tir a) Tai chuin A :

- d6i vc5i thug bao gia dmh : 0,1 Erl ; - doi vcyi thue bao co' quan ; 0,2 Erl.

b) Tai chu^n B Lu-u Iwo^ng tang vucyt tai chu^n A:

- 25% vh Erl; - 35% ve BHCA.

3.3 Mifc phuc vu

3.3.1 Kha nang phuc vu Khk nang phuc vu cua tong d^i phhi dhm b&o c^c chi tiSu cho

trong bing 1.

Bang 1 - K ik nang phuc vu c ia tong dki Th6 loai dfinh gi^ Che do 1km viec

binh thuo-ng %

Ch8 do qua tai 15%

%

1. Xic suSt phai chd" dcyi am md-i quay so qud 3 giay

<1,5 < 10,0

2. Ton that khi gpi noi bo < 0,5 <2,5 3. Ton that khi goi ra mang nOi hat quoc gia

<2,0 <5,0

4. T6n thit khi goi tu-mang quoc gia vko

< 1,0 <3,0

5. Chuy^n ti^p - '

3,3.2 Tre gui am mo-i quay so Tre g\}i am mdi quay s6 Ik khokng thd-i gian tir khi giao dien

thug bao tong dki nhan du-o-c trang thdi nhkc mky dSn khi tong dki

TCN 68-146:1995

b^t SiU cung cap am mo-i quay so tdi dudng dSy. Trl n^y durQ-c quy dinh d" bhng 2.

Bang 2 - Tre am md"! quay so

Tai chuan A Tki chu^n B Gia tri trung bmh, ms <400 < 800 X6c su^t 0,95 khong vucyt qu^, ms

600 1 000

3.3.3 TrI n6i thong Tre noi thong 1 khoang thai gian cSn thi^t de tong d&.i thuc

hi8n n6i thong gitJa cSc kSt cuoi t6ng dM di vk dSn. Tre nky diigc quy dinh & bang 3, bkng 4.

Bang 3 - Tre noi thong doi vcri cage noi ggi ra

Tai chuan A Khong Cling

thiit bi phu Cung thiet

bi phu

Tai chuan B Khong Cling thi^t bi phu

Cling thiet bi phu

Gia tri .trung binh, ms

<250 <350 <400 <500

Xic suSt 0,95 khong vuo't qu^, ms

300 500 600 800

Bang 4 - TrS noi thong ddi vc i cu6c nSi noi bo v^ kit cuoi

Tai chuan A - ~ - •• • )

Tki chuan B Gi^ tri trung binh, ms < 100 < 100 Xic suit 0,95 khong yvro't qu^, ms

180 180

3.3.4 Tri ngat chuong cho c^c cuOc goi noi bo vh kit cu6i Tr^ ngat chuong cho c^c cuoc goi noi bo v^ ket cuoi 1

khoang thdi gian td khi thue bao bi ggi nh^c mSy duo-c nh&n 6" giao dien dird'ng day thud bao tai khi tin hi§u chuong d" cung giao dien nky dircyc ngiJng d p . Tr§ n^y duo'c quy dinh & bang 5.

TCN 68-146:1995

B^ng 5 - Tre ngat chuong cho c^c cuoc goi noi bO v^ k§t cuoi

Tki chu^n A Tai chuSn B Gia tri trung binh, ms < 100 < 150 Xic suat 0,95 khong viro't qui, ms

150 200

3.3,5 Trl gihi ph(5ng cuoc goi tong dM Tri giki phdng cuSc goi t6ng d i 1 khoang thd-i gian tii khi ySu clu cu6i Cling dh giai ph6ng tuyan n6i cd hieu lu-c xii 1^ trong tdng d i t&i khi tuyin n6i diro-c gi^i phdng. Tre nky dtrcc quy dinh & bkng 6.

Bing 6 - Tre giai phdng cuoc goi tong 6ki

Tai chuSn A Tki chuan B Gia tri trung binh, ms <250 <400 Xic su£t 0,95 khong viro't qud, ms

300 700

3.4 Tinh kha dung

3.4.1 Thd-i gian h6ng trung binh Thd-i gian h6ng b8n trong gdp lai trung binh (MAIDT) cho mOt

ket cu6i. AMIDT (1) < 30 phijt/nam.

3.4.2 He s6 l5i bi't : - hS s6 loi bi't do nghiSm thu < 1 x 10- - hd so loi bit van hknh < 1 x 10-6

3.4.3 Do tin c$y phin ciing ^ ^ ^ Doi vcPi moi trud-ng thiit bi s6 cho ph6p hu- hdng li n nhat 1

20 tien 1 000 cua trong mot nam. D6i vt^i moi trud'ng thi8t bi tuo-ng tu hoac two-ng tir - so thi hu h6ng Ic n nhk cho ph^p 1 28 tren 1 000 cua trong mot nam.

3.4.4 Dieu khiln tai tong dki . . , Cic trang th^i qui tki khong duo'c anh hu-d'ng xau d^n c^c cuOc

goi hoac tuydn noi da du-cyc thi8t lap.

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TCN 68-146:1995

3.4.5 Dong b6 T6ng d i phai c<5 kha nang tu dOng bo v^ tiep nhan d6ng bp t\i ngoki vc?i do chinh x^c 1 10 ^

3.5 Dinh tuyen vk lira chon : - tong dki phki c6 khh nang dSu trung ki mot chilu hoac hai chilu; - tong dki c6 khk nang dttng \&i 7 chiJ s6 d8 dlnh s6 noi bo; - tong dM c6 the dl dkng thay d6i yeu c^u sir dung thuS bao, trung ke bang l^nh ngirdi - m^y; - tong dki cd kh^ nang dieu kJii^n it nhtt Ik 16 chtJ so.

3.6 Canh bko, do thit, quan sit Topg dki phai cd kha nang canh bko sir c6, do thu vk gikm skt trang th^i hoat dong cua nd.

4 C^c chi tiSu vl truySn dan

4.1 Cdc chi tiSu yh truyln din cua ckc giao dien tu-o-ng tir hai day (trung ke tiro-ng tu hai day vk thu8 bao tao'ng tir)

4.1.1 Bang tan kenh thoai c k ehuyin mach ivt 300 din 3 400 Hz.

4.1.2 Trd" khkng tdng dki Ik 600 Q ± 10%

4.1.3 Suy hao phkn xa : a) 300 Hz : > 14 dB; b) 400 Hz : > 16 dB; c) 500 Hz : >18 dB; d) tu 500 din 2 000 Hz :> 18 dB; e) 2 700 Hz : >16 dB; f) 3 400 Hz : > 14 dB.

4.1.4 Suy hao mkt can bang ve dSt : - ' trong d^i tu 300 din 600 Hz : >40 dB;

- trong d^i tu- 600 dSn 3 400 Hz : >46 dB.

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TCN 68-146:1995

4.1-5 Suy hao truySn dan giua 2 giao dien vko vk ra : a) giufa thu6 bao V(fi trung ki vh giUa trung ki vc5'i trung kS

lu 0 dSn 2,0 dB; b) giua thue bao vc 'i thui^ bao ti> 0 din 8,0 dB.

4.1.6 Mifc tap am (do & tin sO 1 000 Hz, tv& khing 600a) : - mifc tap Sim xung : < - 35 dBmOp; - mif c tap §m khong cSn bang : < - 65 dBmOp.

4,1'.7 Suy hao xuy8n dm qua tong dhi : - do ^ tin s6 1 000 Hz, ir& kh^ing 600 Q ; > 67 dB.

4.1.8 M6o suy hao theo tin s6 Su thay doi suy hao theo tin s6 ciia k8nh bSt kj?- phai nam trong

c^c gic i han cho trong bang 7.

Bang 7 - M6o suy hao 1 heo tan so (so vc i tSn so 1 000 Hz) Tan so M^o suy hao

Hz dB 200 tren 0 300 tr§n - 0,6 nhu-ng dirc i + 2,0 400 tren - 0,6 nhirng dirc i +1,5 600 tren - 0,6 nhirng du'd i + 0,7

2 400 tr8n - 0,6 nhirng dircfi +1,1 .3 000 tr8n - 0,6 nhirng dircri + 3,0 3 400 trgn - 0,6

4.1.9-Tre nhdmtuyat d6i Tr^ nh6m tuySt doi gom ch tr^ do d6ng chinh khung vk c^c tiing

chuy6n mach thai gian v i khong gian cxia mang chuydn mach trong hS thong. Gi^ tri trung binh cua tre nhdm tuy^t dOi phM < 2100 [is.

4.2 Cdc chi tieu truySn din giua c^c trung ke tiro'ng tir 4 day

4.2.1 Bang tan kenh thoai cln chuy§n mach t^ 300 din 3 400 Hz.

4.2.2 Trd khdng tong dM Ik 600 a ± 10%.

4.2.3 Suy hao phan xa trong dhi tu 300 din 3 400 Hz : > 20 dB.

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TCN 68-146:1995

4.2.4 Suy hao do mat c^n bang vh dk : - trong dai tii 300 dSn 600 Hz ; > 40 dB; - trong dai tii 600 din 3 400 Hz ; > 46 dB.

4.2.5 Suy hao truyin dtn giffa 2 giao di^n vko v& ra : a) giira thu6 bao tucng tir vc?i trung kS tipo-ng tir 4 d% Ik (3,0 ± e,5) dB

b) giiJa trung ke tirang tir 2 day vc i trung k l tircyng tir 4 dSy IJi (1,5 ± 0,5) dB;

c) giua cdc trung kl tiro-ng tu' 4 day vai nhau Ik (0 ± 0,5) dB.

4.2.6 Suy hao xuy^n Sm : - tin s6 do 1 000 Hz, trtS" kh^ng 600 Q phki > 67 dB.

4.2.7 M6o suy hao theo t^n s6 Sir thay doi suy hao theo t^n sd cua kSnh bSt kf phki nkm trong

gic i ban cho trong bkng 8.

Bang 8 - M6o suy hao theo tin so (so vtfi tin s6 1 000 Hz)

Tin so Hz

M6o suy hao dB

200 300

2 400 3 000 3 400

tren 0 trSn - 0,5 nhirng dtrcJi + 0,5 tr^n - 0,5 nhirng dirc^i + 0,9 trea - 0,5 nhirng duc^i + 1,8 tren - 0,5

4.2.8 Tre nhdm tuy^t d6i Gil tri trung blnh cfia tr^ nhdm tuySt d5i phai < 2 100 jis.

4.3 Clc chi tieu truySn dSn cia c^c trung k6 s6 chi x6t v(yi clc trung k^ so vt^i t6c do 2 048 kbit/s. 4.3.1 Cdc dac ti'nh chung :

• - toe do bit 2 048 kbit/s ± 50 ppm; - mk dud-ng truyin : HDB3.

4.3.2 Cdc chi tiSu ky thujit d* cSc ciia ra. CS.C chi ti8u nky dutyc quy dinh & bang 9

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TCN 68-146:1995

BS.ng 9 ~ CAc chi tiSu ky thuat & cic cua ra

Trd- khdng tai do, Q. Dien trd" 75 DiSn tro' 120 Di6n dp dinh khi khong c6 xung, V

2,370 3,000

)

Dien dp dinh khong c6 xung, V

0 ± 0,237 0 ± 0,300

Dp rong xung danh dinh, ns

244

T^ so giufa bien dp xung du'O'ng vk Sm 5" tam xung

tu' 0,950 dan 1,050

T ' s6 giiPa dp rpng xung du'O'ng vh xung £im o- mot nija bien do xung danh dinh

tu- 0,950 din 1,050

4.3.3 Cdc chi tieu ky thuat & cdc ciia vko Suy hao d* t§n s6 1 000 Hz ph^i nim trong dai ti> 0 din 6,0 dB.

4.3.4 Suy hao m^t phoi ho-p trd* khdng & dku vko phai \dn htyn cdc gid tri sau :

- a) trong dai ti> 51 din 102 kHz : 12 dB; b) trong dai tu- 102 d8n 2 048 kHz : 18 dB; c) trong d^i ti> 2 048 den 3 072 kHz : 14 dB.

5. Cdc chi tidu vl bdo hieu

7 *v -*

5.1 Chi tieu v^ cic tin hi^u thong b^o

5.1.1 Mirc diSn tin hieu thong bdo : - vrfi cdc tin hieu thong bdo mot tin s6, mux Ik (-10 ±5) dBmO (duo'c do vc 'i Sm li6n tuc); - vcfi cdc tm hiSu thong bdo dac biet, mu'c khdc nhau giUa 2 hoac 3 tan s6 bat ky tao ra am m 3 dB;^ - vtfi cic cira thug bao dung mdy an phfm thi mifc ti'n hieu m6'i quay s6 phai > -10 dBmO.

5.1.2 Tin hieu mM quay so

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Tin hi8u n iy thong b^o tong dai da san shng nhan thong tin cupc gpi v^ y6u cSu ngu'di dilng bit dSu gii-i thong tin cuoc goi :

- tan so : (425 ± 25) Hz; - nhip : lien tuc; - m6o h^i : < 1%.

5.1.3 Tin hieu bio ban Tin higu n^y thong b^o dird-ng day thue bao bi goi dang ban :

- t k s6 : (425 + 25) Hz; - nhip : F + D : Tir 300 din 1100 ms; v(^i : F - Thd*i gian phit ti'n hieu

D - Thai gian du'ng ti'n hi8u F

Ti le :— tvt 0,67 din 1,5 D

- m6o h^i : < 1%. 5.1.4 Tin hidu bSo dang cip chuong

Tin hieu n^y thong bio td'i thuei bao chu goi rang tuyin n6i da dircyc thilt ISp vk dang csLp chudng cho thu8 bao bi goi :

- tin s6 : (425 ± 25) Hz; - nhip ; cd tin hieu : tij 0,67 d§n 1,5 s;

, khong c6 tin hieu : tu 3 den 5 s; - m^o hki : < 1%.

5.1.5 Tin hiSu if dong Tin hieu n^y th6ng bio tc i thuS bao chu goi rang tong dM khong c6 khk nang thurc hiSn cuoc gpi vi clc dud'ng da sir dung hit : - tan s6 : (425 ± 25) Hz, - nhip lap lai 3 Itn :

+ c6 tin hieu : 0,2 s: + khdng c(5 tin hieu : 0,2 s:

- m6o hM : <l%.

5.1.6 Tin hieu tim duo-ng Tin hi$u nky thong bio chothu^ bao chu gpi ring tong dM dang tim du*( ng thiSt lap cu6c gpi, tin hieu nly chi c^n thiit cho clc cuoc gpi dird^ng dki :

- tlln s6 : (425 ± 25) Hz; - nhip : 0,05 s / 0,05 s;

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5.2 Chi tieu vh tin hi^u chuong : - dign ^p : tiJ 75 dSn 100 VAC; - tin s6 : ttr 16 den 25 Hz; - nhip : c6 chuong tii 0,67 dSn 1,5 s;

khong c(5 chuong tt> 3 din 5 s;

5.3 Ti'n hieu etrc^c ti> xa (chi dting cho b^o hieu diu cu6i): - tan s6 xung : 16 kHz hoac 12 kHz; - dp rpng xung ; (125 ± 25) ms; - rnifc ph^t : 2 V + 10%; - cong suat ph^t : 20 mW + 20% tren tai 200 Q; - m6o h^i ; < 5%.

5.4- Chi tieu vh c^c tin hi6u dia chi 5.4.1 Tin hi0u dia chi xung thSp phan

Khi l^m viec v<5'i c^c dud-ng day dung phucng thifc truy6n tin hieu dia chi bang xung thSp phSn (DP), tong dki phhi x\i ly ti'n hiSu vcJi x^c suat loi P< 10- v^ toe dp truy^n xung cho trong bkng 10.

Bang 10 ' Chi tigu tin hiSu dia chi xung th^p phSn Toe dp truy^n xung Dp dhi xung

xung/s ms 7 ti> 35 din 112 9 t\> 35 dSn 91 11 ttr 35 din 71 12 tu 35 dan 62

5.4.2 Tm hiSu dia chi m^ da tin (DTMF) Khi t6ng dhi 1km vi6c v(5 i c^c duang day (thu8 bao hoac trun^ kl) vai phiro-ng thuc truyin ti'n hi^u dia chi m^ da tin (DTMF) chi tieu ky thuat d6i vtfi thiit bi thu ti'n hieu dia chi c ia tong dki phhi ddp vfng : - cdc tin so tin hieu :

+ nh(5n\ thip : 697 , 770 ; 852 ; 944 Hz; + nh6m cao : 1 209 ; 1 336 ; 1 477 ; 1 633 Hz;

- dp lech tin sd cong tdc trong kho&ng ±1,8%; - mu=c cong t^c cua c^c ti'n hieu tin s6 : tu -3 den -24 dBmO; - mifc cong suit chenh lech Id'n nhit cho ph6p giua hai ti'n'hi^u tin s6 (tin s6 tren vk tin so dud-i) : < 5 dB;

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TCN 68-146:1995

- tho'i gian thu moi tin hieu : + do dSii gio'i hati cua tin hieu Ih 40 ms; + khoang each giflra cac tin hieu Ih 30 ms;

- toe do thu tin hieu nho nhat : 120ms/1 chu' so; - kha nang chong anh hu'dng nhieu tieng n6'i : mifc loi cho phep la < 6 ldi/46gi6', vd'i tilng ndi cd mux trung binh -15 dBm.

5.5 Chi tieu bao hieu trung ke giila cac tong dtii Tong dhi phai c6 kha nang bao hieu theo b^o hieu mot chiSu hoac bdo hieu R2 theo quy dinh cua Tong euc Buu di6n.

6. Kha nang d^p ting cua tong dai vcri c^c loai dird'ng day

6.1 Du'd-ng day thue bao a) Quy dinh dien ap ^ren day a,b :

- day a c6 di. ii ap (-) so vdi dSt; - day b c6 dien ap dat so vdi ngudn (-) tong dki.

b) Quy dinh dien dp dao eii'C tren 2 day a,b ; La dien ip tren day a,b ngu-o-c vcyi quy dinh & muc a.

c) Dien trd' mach vdng tren 2 day a,b ; Phai nho ho'n I 800Q (ke ca noi trd m^y di$n thoai)

d) Dien trd chenh lech Id-n nhat 2 day a,b : R . b m . x ^ l 2 Q . . . ^

e) Dien trd each dien day - day, day - d^t nh6 nhdt cho phep (cd gii phoi day):

Red ,™n 1 0 kQ f) Dien dung ky sinh lo'n nhat cho phep:

Cn... ^ 0,5 ixF

6.2 Du'd'ng day trung ke a) Dien trd mach v5ng day a,b Idn nhat cho phep:

' Ra-b,B.x ^1200 a b) Dien trd cAch dien day-day, day-dSt nho nh^t cho ph6p (c6 gia phoi day) :

Re. ,.,„ ^ 20 kQ c) Dien dung ky sinh Idn nhiit cho phep :

• C , _ < 0,5 MF

Q6 15

TCN 68-146:1995

7. Chi tiSu ve nguon dien va moi trirong l^m viec

7 V "i

7.1 Chi tieu ve nguon dien 7.1.1 Nguon xoay chieu :

a) 110 VAC (+10%, -20%); b) 220 VAC (+10%, -20%); c) tSn so ngu6n xoay chiSu: (50 Hz hoac 60 Hz) + 1 Hz.

7.1.2 Nguon mot chieu a) 48 VDC (+ 6 VDC, - 4 VDC); b) cu-c (+) cua ngu6n mot chilu d^u vm dit (v6 tong dai); c) do gcrn sdng nguon mot chieu so' cap khong duo'c vucrt qui 2,5 mV; d) di$n dp nguon mot chieu thir cSp phai c6 co" che blio ve chong qua

dp vk qud dong; e) tieu thu nang luang cho phep Icyn nhat doi vcyi to^n bo tong dM

khong duo'c vircyt qua 2 W tren mot du'd'ng day thue bao hoSc trung k6.

7.1.3 Dien trd tiSp dat cua tong dki B\$n trd" tiep dat cua tong dhi gdm cd dien tra tiep dat cong tdc vk dien trd- tiep dat bao ve. Tiiy theo dung lu'o-ng cua tong dki mh. yeu cau didn trd tiep dat cho trong bang II .

Bang 11- Dien trd tiep dat cua tong ddi Dung lu'cyng Dien tra tiep Dien tro- tilp dSl

dat bao ve X

so cong tac Q

n < 100 < 10,0 < 100 < 500 <5,0 < 100

< 1 000 <2,5 < 10 < 2 000 <2,5 > 10

7.2 Moi tru'd'ng IJim viec cua tong dai : - nhiet dp: tu- 0 dSn 50 "C; - do am tuo'ng d6i; tu 20 dSn 80 %.

7.3 Bao ve duo-ng day dau vao tong d^i Tong dki phai c6 cac thi^t bi bao ve chong dien ap la tren du'6-ng day thue bao, trung k6 khi dien dp la cd gid tri >110V.

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