C.03 Distribution Transformer - VN -Centrepoint

DISTRIBUTION TRANSFORMER

The English language version prevails. u tin ting Anh khi c tranh chp.

Centrepoint Page 1 of 11 of C.03 18 September 2007

TRANSFORMERS MY BIN P

1 GENERAL 1 TNG QUAN

1.1 FUNCTIONAL DESCRIPTION 1.1 M T The transformer scope of work includes the supply and installation of the indoor mounted transformer, fed from the HV switchgear and feeding to the main LV switchboard. Provide Silicon oil filled transformers to Fire Police approval.

Phm vi cng vic my bin p trung th bao gm cung cp v lp t my bin p trung th loi trong nh, ly ngun t t trung th, v cp ngun cho t in h th chnh. Cung cp my bin p du silicon cho ph duyt phng chy cha chy

1.2 CROSS REFERENCES 1.2 THAM CHIU CHO

General Refer to the General requirements worksection.

Tng qut Ph hp vi chng Nhng yu cu chung.

Related Worksections Electrical General Requirements, HV Switchgear, Power Cables, Cable Support & Duct Systems

Nhng chng lin quan Tham chiu n cc chng sau: Nhng yu cu chung v in, T in trung th, Dy cp in v dy dn, H thng ng in v thang mng cp.

1.3 STANDARD 1.3 TIU CHUN

General IEC 60076 Power Transformers IEC 60137 Bushings for Alternating Voltages above 1000V IEC 60269 Low Voltage Fuses Fuses with Enclosed Links IEC 60051 Direct Acting Indicating Electrical Measuring Instruments and Their Accessories IEC 60529 Degrees of Protection Provided by Enclosures (IP Code) IEC 60551 Measurement of Transformer and Reactor Sound Levels IEC 60606 Application Guide for Power Transformers IEC 60616 Terminal and Tapping Markings for Power Transformers IEC 60671 Insulation Co-ordination IEC 60354 Loading Guide for Oil-immersed Power Transformers IEC 60034 Rotating Electric Machines ISO 1000 The international system of unit (SI) and its application BS 7671 IEE Wiring Regulations IEE Regulations for Electrical Installations, 16th Edition, 1991.

Tng qut IEC 60076 My bin p cng sut. IEC 60137 t ng lt cho in p xoay chiu trn 1000V. IEC 60269 Cu ch in p thp Cu ch c lin kt dng kn. IEC 60051 Dng c o lng in ch th tc ng trc tip v cc ph kin. IEC 60529 Cp bo v do v t to thnh (m bo v IP). IEC 60551 S o lng my bin p v cc mc m thanh phn ng. IEC 60606 Hng dn s dng my bin p cng sut. IEC 60616 Ghi nhn bao bc cch in v u ni cho my bin p cng sut. IEC 60671 Sp xp cch in. IEC 60354 Hng dn ti cho my bin p ngm du. IEC 60034 My in quay. ISO 1000 H thng n v quc t v cc ng dng ca n. BS 7671 IEE Quy nh u dy IEE Quy nh cho vic lp t in, n bn ln th 16, nm 1991.




1.4 DESIGN 1.4 THIT K

General Suitably rated transformers shall be installed to cater for all LV power requirements. Transformers shall be installed indoors in a non-hazardous area. Transformers shall be capable of continuous duty at any voltage/frequency within the tolerances stated in this Specification. Transformers shall also have cyclic duty capacity in accordance with IEC 60354. Transformers shall supply mechanical, general power and lighting loads and shall be designed for unbalanced loading conditions. Transformers shall be capable of supplying short term transients to meet motor starting inrush currents. The Transformers shall be provided with off-load manual tap changers, having a tapping range of +/5% in steps of 2.5%. The Transformers shall be capable of operating at their rated power output at any specific tapping. The Transformers shall be designed to withstand without damage the thermal and dynamic effects of external short circuits.

Tng qut Lp t my bin p c cng sut ph hp cung cp cho tt c cc yu cu cng sut h p. My bin p c t trong nh trong khu vc khng gy nguy him. My bin p c kh nng hot ng lin tc vi bt k in p/ tn s trong khong dung sai nh trong ti liu Qui nh k thut ny. Cc my bin p c cng sut u n theo IEC 60354. My bin p s cung cp ch yu cho ti c kh, ti tng qut v ti n nhng vn c thit k cho cc iu kin ti khng cn bng. My bin p phi c kh nng cung cp cc bin i in ln trong thi gian ngn thong qua p ng nhng dng khi ng ng c i vo. My bin p c cung cp vi cc b iu chnh bng tay khi khng ti, c di iu chnh +/5% vi bc chnh 2.5%. My bin p ny c kh nng cp ra cng sut nh mc u ra ti cc mc chnh ring bit. My bin p c thit k chu ng c tc ng lc v tc ng nhit ca dng ngn mch bn ngoi m khng b h hi.

System Voltage/ Frequency and Tolerances Transformers shall function correctly between the system steady state voltage and frequency tolerances detailed below: Voltage 22kV/400V nom.+ 6% -10% Frequency 50 Hz nominal +/5% Further, the Transformers and associated equipment shall be able to function through the following short-term transient variation: Voltage: Nominal +15%, -20% Frequency: Nominal 10% The Total Harmonic Distortion will be 5%. The Transformers shall be designed with particular attention to the suppression of harmonic currents, particularly the 3rd and 5th.

H thng in p/ Tn s v cc dung sai. My bin p hot ng hon ho trong khong dung sai tn s v in p c nh m t chi tit di y: in p danh nh 22kV/400V + 6% -10% Tn s danh nh 50 Hz +/-5% Thm na, my bin p v cc thit b phi hp c kh nng hot ng qua cc bin i in ngn hn sau: in p: danh nh +15%, -20% Tng s: danh nh 10% Tng mo sng hi l 5% My bin p c thit k vi ch c bit n vic ngn chn cc dng sng hi, c bit l dng sng hi bc 3 v bc 5.

Layout Position equipment to provide safe and easy access for operation and maintenance. Consider functional relationships between items of equipment in the laying out of equipment on the assembly.

B tr t thit b ti ni an ton v d dng i vo vn hnh v bo tr. Cn nhc cc mi quan h chc nng gia cc b phn thit b khi b tr mt bng cc thit b ca t hp.




Service conditions The Transformers shall be suitable for installation and operation in Vietnam and the environmental conditions described in the data sheets and project specifications. The Supplier shall be responsible for ensuring that all equipment and components supplied are suitable for the operating and conditions stated. Where the Supplier standard or preferred design option does not meet the operating or environmental conditions, the Supplier shall give details of the technical changes and commercial impact of complying with the stated conditions. The Transformers will be installed indoors and the design ambient temperature shall be 40 deg C.

iu kin hot ng My bin p ph hp vi iu kin vn hnh v lp t ti Vitnam cng cc iu kin mi trng khc c m t trong cc trang s liu v qui nh k thut ca d n. Nh cung cp c nhim v bo m rng tt c cc thit b v cc chi tit thnh phn c cung cp th ph hp vi iu kin vn hnh nh. Ti nhng ni m tiu chun ca nh cung cp hay phng n thit k u tin khng thch hp vi iu kin mi trng hay iu kin vn hnh ny, th nh cung cp cho cc chi tit thay i k thut v nhng nh hng thng mi ph hp vi iu kin nh trn. My bin p c lp t trong nh v nhit xung quanh thit k l 40C

Degree of protection In plant rooms: IP54.

Cp bo v Trong cc phng t thit b: IP54

Mounting Floor mounted: Assemblies generally.

Gn Gn trn sn: Gn nh thng l

Connection Indoor cable entries: Top and bottom. Outdoor cable entries: Bottom.

u ni Li vo cp bn trong nh: Trn v di. Li vo cp ngoi nh: Di.

Leaks Oil leaks shall be cause for immediate rejection, and replacement including all associated costs, upon delivery and throughout the defects liability period.

R, r R r du s l nguyn nhn cho vic loi b ngay lp tc, v s thay th bao gm tt c cc chi ph lin quan, khi giao hng v xuyn sut thi gian chu trch nhim v khuyt tt.

2 QUALITY 2 CHT LNG

2.1 INSPECTION 2.1 KIM TRA

Notice Give notice so that inspection may be made at the following stages: - Core fabrication - Core winding - Assembly ready for routine testing and

dispatch. - Assembly installed and connected. - Acceptance.

Thng bo Thng bo cho vic kim tra c thc hin theo cc bc sau: - Ch to li. - Qun dy li. - Lp rp sn sng cho vic th

nghim hng ngy v gi i. - lp t v u ni - Chp thun

2.2 PRE-COMPLETION TESTS 2.2 TH NGHIM TRC KHI HON TT

Type tests Typical test certificates shall be provided for the following type tests on similar type of transformers (eg from a different source):

Th nghim mu Cc giy chng nhn th nghim mu in hnh c cung cp cho cc th nghim mu sau trn cc kiu my bin p tng t: - Th nghim s tng nhit




- Temperature rise test - Impulse voltage withstand test - Noise - Short circuit withstand

- Th nghim chu xung p - n - Chu ngn mch

Production tests Inspection and testing shall be carried out in accordance with the IEC and/or relevant Codes and Standards, and shall include but not be limited to the following: - Measurement of winding resistance

and voltage ratio - Measurement of impedance voltage

and load losses - Measurement of no-load losses and

current - Vector group conformity - Insulation Resistance Test - Quantitative Check of all items - Functional tests on alarm/trip devices - AC voltage/power frequency one

minute test - RFI immunity test - Tank hydrostatic pressure test All test reports/certificates shall be submitted to the Engineer within fourteen (14) days of the completion of such tests. Test reports and certificates shall be approved prior to the equipment leaving the factory. If the test results show that the transformer does not meet the specified performance, the contractors supplier shall make necessary correction to the satisfaction of the Project Manager/ Engineer before acceptance is made.

Th nghim sn xut Cc kim tra v th nghim c thc hin theo tiu chun IEC v/ hay cc tiu chun v cc iu lut lin quan, v bao gm nhng khng b gii hn cc chi tit sau: - o lng t s in p v in tr

cun dy - o lng tn tht ti v in p tr

khng - o lng dng in v tn tht

khng ti. - S ph hp nhm vc t - Th nghim in tr cch in - Kim tra s lng tt c cc thit b - Th nghim chc nng ca dng c

ngt/bo ng. - Th nghim mt pht cng sut/ in

p xoay chiu AC. - Th nghim s khng tc dng ca

RFI - Th nghim p lc tnh ca thng

cha. Tt c cc giy chng nhn/bo co th nghim c trnh cho Nh t vn trong vng 14 ngy t khi hon tt mi th nghim. Cc giy chng nhn v cc bo co th nghim phi c chp thun trc khi thit b xut xng. Nu kt qu th nghim ch ra rng my bin p khng t cc c tnh c ch r, th nh cung cp ca nh thu s thc hin cc chnh sa cn thit nhm tha mn Gim c d n/ Nh t vn trc khi s chp thun c thc hin.

Site tests - Measurement of winding resistance

and voltage ratio - Measurement of impedance voltage

and load losses - Measurement of no-load losses and

current - Measurement of zero sequence

impedance - Partial discharge test - Insulation Resistance Test - Quantitative Check of all items - Functional tests on alarm/trip devices - AC voltage/power frequency one

minute test

Th nghim ti cng trng - o lng t s in p v in tr

cun dy - o lng tn tht ti v in p tr

khng - o lng dng in v tn tht

khng ti. - o lng tr khng th t khng - Th nghim phng in cc b - Th nghim in tr cch in - Kim tra s lng tt c cc thit b - Th nghim hot ng ca dng c

ngt/bo ng. - Th nghim mt pht cng sut/ in

p xoay chiu AC.




If the test results show that the transformer does not meet the specified performance, the contractors supplier shall make necessary correction to the satisfaction of the Engineer before acceptance is made.

Nu kt qu th nghim ch ra rng my bin p khng t cc c tnh c ch r, th nh cung cp ca nh thu s thc hin cc chnh sa cn thit nhm tha mn Gim c d n/ Nh t vn trc khi s chp thun c thc hin.

2.3 SUBMISSIONS 2.3 TRNH DUYT

General Submit type test certificates for components, functional units and assemblies.

Tng qut trnh giy chng nhn th nghim mu cho cc phn hp thnh, cc thit b chc nng v my bin th.

Calculations General: Submit detailed certified calculations verifying design characteristics.

Tnh ton Tng qut: trnh cc bn tnh ton chi tit c chng nhn thm tra cc c tnh thit k.

Type test data General: Verify that type tests and internal arcing-fault tests, if any, were carried out at not less than the designated fault currents at rated operational voltage. Alterations to TTAs: Submit records of alterations made to assemblies since the tests.

S liu th nghim mu Tng qut: Thm tra rng cc th nghim mu v cc th nghim r h quang bn trong, nu c, c thc hin vi dng khng nh hn dng r thit k ti in p vn hnh nh mc. S sa i n TTAs: trnh cc h s v s sa i vi cc b phn do cc th nghim.

Product data for proprietary assemblies Submit the following:

Ti liu sn phm cho my bin th lp rp c quyn. trnh cc chi tit sau y:

Shop drawings Submit shop drawings showing: - Types, model numbers and ratings of

assemblies. - Detailed dimensions. - Shipping sections, general

arrangement, plan view, front elevations and cross-section of each compartment.

- Projections from the assembly that may affect clearances or inadvertent operation, such as handles, knobs

- Fault level and rated short circuit

capacity characteristics. - IP rating. - Fixing details for floor or wall

mounting. - External and internal paint colours and

paint systems. - Construction and plinth details,

ventilation requirements - Labels and engraving schedules - Manufacturers name - Type designation - Purchaser order number - Year of manufacture

Bn v thi cng trnh cc bn v thi cng th hin: - Loi, s mu, v cng sut cc b

phn. - Chi tit cc kch thc. - Cc cu phn vn chuyn, sp xp

tng qut, mt bng, mt ng trc v mt ct ngang cho mi b phn.

- Nhng ch nh ra ca cc b phn

lp rp c th nh hng n kch thc hay gy ra s vn hnh v nh mc quai, tay nm

- Mc r v cc c tnh cng sut dng ngn mch nh mc

- Cp bo v IP - Chi tit lp t, t trn sn hay gn

trn tng - Mu sn bn trong v bn ngoi v

cc h thng sn - Thi cng v cc chi tit b my, yu

cu thng gi - Cc nhn v bng lit k khc nhn - Tn nh sn xut - Chng loi thit k - M s n t hng ca ngi mua

hng - Nm sn xut




- Rated MVA and Voltage Ratio - Rated frequency and number of phases - Impedance voltage - Rated voltage of the auxiliary circuits - Degree of protection - Connection diagram - HV tapping voltages

- T s in p v nh mc MVA - Tn s nh mc v s pha - in p tr khng - in p nh mc v cc mch ph - Cp bo v - S ni dy - in p trung th iu chnh

3 CONSTRUCTION 3 THI CNG

General Transformers shall be oil filled and hermetically sealed type. All materials used shall be corrosion resistant and non-hygroscopic. The tanks shall be constructed of steel. The tank cover shall be welded to the tank with a continuous weld and the expansion space sealed with dry air or inert gas. Filling and drain orifices shall also be sealed and rendered tamper-proof and shall be pad-lockable type. The tank cover and cooling system assembly shall have the mechanical strength to withstand without permanent distortion, the internal pressure caused by the contraction or expansion of the liquid and gas/air volumes under the specified service conditions. Certified lifting lugs and jacking points shall be provided for the complete Transformer and for the core & coils. The Transformer core shall be constructed from high quality grain oriented silicon steel and designed to ensure that leakage flux does not cause over-heating in any part of the Transformer. The Transformer base shall be sufficiently rigid to permit skidding in any direction and shall be suitable for fixing down by either bolting or continuous welding. The Transformer shall be fitted with pressure relief devices, pressure & temperature gauges and liquid level sight glasses with maximum/minimum indication. Pressure relief devices shall be fitted with a set of changeover contacts. All gasketed joints shall be below cold liquid level and gasket materials shall be suitable for use with the specified oil.

Tng qut My bin p l loi kn hon ton v ngm du v c. Tt c cc vt liu l loi chng n mn v khng ht m. Bn cha c lm bng thp. Np bn c hn vo bn vi mi hn lin tc v mt khong khng gian gin n kn np y khng kh kh hay kh tr. Vi cp hay vi x loI chng xo trn ngc tr li c du kn v l loi c kho mc. Np bn v cc b phn ca h thng lm mt phi c bn c kh nhm chu c m khng b un, do p sut t bn trong khi th tch du v kh co li hay gin n ra di iu kin lm vic qui nh. Cc mc nng bo m v im kch c cung cp cho ton b My bin p v cho li & cc cun dy. Li my bin p c ch to t thp silic nh hng th cht lng cao v c thit k bo m dng r khng gy qu nhit bt k b phn no ca my bin p. Chn my bin p cng cho php chn theo cc hng bt k v thch hp cho vic c nh xung sn bng bulng hay hn lin tc. My bin p c gn vi cc dng c gim p, nhit k, p k v knh thm mc du vi ch dn mc cao nht/ mc thp nht. Dng c gim p sut c lp cng vi mt b cng tc chuyn i. Tt c cc ming m kt ni c dng khi thp hn mc cht lng khi ngui v tt c cc vt liu m ph hp vi du c ch nh.

Cooling The transformers shall be naturally air-cooled ONAN (Oil Natural Air Natural) type. The manufacturer shall provide calculations to substantiate temperature rises for natural cooling ratings.

Lm mt My bin p l loi lm mt t nhin bng khng kh, ONAN (T nhin bng Du T nhin bng Khng kh). Nh sn xut cung cp bn tnh ton chng minh gi tr tng nhit thc t cho nh mc lm mt t nhin.




Transformer Windings The windings of the Transformers shall be insulated in a uniform manner and designed to withstand the power frequency and impulse test voltage for the respective insulation level. The winding materials shall be copper. Transformer laminations shall be securely restrained to ensure that vibration is kept to a minimum. The core clamps shall be designed to ensure that they shall not be required to absorb dynamic short circuit forces. The winding insulation level shall comply with the requirements in IEC-60076-3. The Supplier shall provide calculations / analysis confirming the maximum fault levels and duration applicable to the Transformers. The winding arrangement shall be vector group Dyn11.

Cun dy my bin p Cc cun dy my bin p c cch in trong mt dng thng nht v c thit k chu c tn s cng sut v cc in p th nghim dng xung cho cc mc cch in ring. Vt liu dy qun bng ng. Cc thp l cn mng ca my bin p c gi chc chn bo m s rung ng mc thp nht. Kp gi li my bin p c thit k cc li khng b ph thuc vo lc ht in ng ca dng ngn mch. Mc cch in ca cun dy ph hp vi cc yu cu ca tiu chun IEC-60076-3. Nh cung cp trnh cc bn tnh/ bn phn tch xc nhn cc mc ngn mch ln nht v thi gian c th p dng cho my bin p. Sp xp dy qun c dng nhm vct Dyn11.

Temperature Measurement Liquid and winding temperature indicating devices shall be provided. Indicators shall be provided with a maximum temperature pointer. Adjustable sets of electrically independent changeover contacts shall be provided for alarm and trip purposes for each device. Winding temperature indicators shall be preferably of the thermal image type.

o nhit Cung cp dng c hin th nhit ca dy qun v nhit ca cht lng. Cc dng c ch th c im ch mc nhit cao nht. Cc cng tc chuyn i c lp bng in c th iu chnh c c cung cp cho cc mc ch ngt v bo ng cho mi dng c. B ch th nhit cun dy c khuyn co s dng loi th hin hnh nhit.

Off-Circuit Tap Changer A manually externally operated off-circuit tap changer shall be provided and it shall meet the following minimum requirements: The tapping range shall be +/-5% in 2% steps The tapping switch shall be positively located in each tap position and shall be lockable in those positions. The operating handle shall be provided with padlock facilities to lock the tap changer in each position. Mechanical end stops shall be provided The operating handle shall be metal and sized to allow operation without the need for tools. It shall be located directly accessible position (i.e. not requiring removal of any covers) Tap positions shall be clearly marked in line with the data given on the rating plate. One handle shall operate all phases simultaneously. All components shall be adequately supported and braced to withstand the short circuit current for which the

B thay i mch khng ti Mt b thay i mch khng ti vn hnh bn ngoi bng tay c cung cp v tI thiu t cc yu cu sau: Di thay i l +/-5% mi bc l 2%. Cng tc chuyn i t vo mi v tr mt cch chc chn v c kho cho cc v tr . Tay nm vn hnh vi cc kho mc kha b thay i trn ti tng v tr. u chn c kh im cui c cung cp. Tay vn hnh bng kim loi v c kch thc nhm cho php vn hnh m khng cn dng c. N c t ti v tr c th tip cn trc tip c (tc l khng yu cu di di bt k np che no) V tr u thay i c nh du r rng theo hng vi cc s liu c cho trn bng nh mc. Mt tay nm s vn hnh tt c cc pha ng thi. Cc thnh phn c gia c v ging thch hp chu c dng ngn mch theo thng s m My bin p




Transformer is designed. Voltage control tappings shall be provided on the HV windings of the transformers. The tappings shall be arranged on the HV windings to preserve the electromagnetic balance and phase displacement of the transformer at all voltage ratios. The tappings shall be designed to ensure that the transformer shall provide maximum continuous output on all tap settings. All tap settings shall be clearly identified and the corresponding voltage designated on a nameplate attached to the transformer enclosure.

c thit k. Cc u thay i iu khin in p c cung cp trn cun dy cao th ca my bin p. Cc u ny c sp xp nhm bo v s cn bng in t v s dch chuyn pha ca my bin p ti tt c cc t s in p. Cc u thay i c thit k m bo rng my bin p s cung cp ti ra lin tc ln nht trn tt c cc gi tr chuyn i ci t. Tt c cc u c nh du r rng v tng xng vi in p c thit k trn bng tn gn vo v my bin p.

Cable Terminations Cable termination boxes shall be made of steel having enclosure protection minimum IP54 inside and IP56 outside. Separate cable termination boxes shall be provided for the following: HV side of the Transformer LV side of the Transformer Auxiliary circuits (for temperature and pressure) The HV termination box shall be designed for multicore cable connection and the LV termination box shall be suitable for multicore cable connection. HV and LV termination boxes shall be on opposite sides of the Transformer and shall be air & phase insulated type and mounted in an accessible position. They shall be designed to prevent deterioration or failure due to the accumulation of condensation and fitted with pressure relief devices. It shall be possible to terminate cables and busducts without the need for additional insulation. Termination boxes shall be dimensioned and sized to ensure that all cables and busducts can be installed and connected easily.

u ni cp Cc hp ni cp lm bng thp c cp bo v v ti thiu l IP54 cho bn trong nh v IP65 cho ngoi nh. Cc hp ni cp ring bit c cung cp nh sau: Phn cao th ca my bin p Phn h th ca my bin p Cc mch ph (cho nhit v p sut) Hp ni cp cao th c thit k cho vic u ni cp nhiu li v hp ni cp h th th ph hp vic u ni cp nhiu li. Cc hp u cp cao th v h th c t i din nhau trn my bin p, l loi cch in pha & khng kh v c t ti v tr c th tip cn c. Chng c thit k nhm ngn chn s suy gim cht lng hay h hng do s tch lu hi nc ngng t v c gn vi dng c gim p sut. Hp u dy cn c th hon thnh ni cp, thanh dn m khng cn thm cch in. Cc hp c kch thc v qui m bo m rng cc dy cp v cc thanh dn c th lp t v u ni d dng.

Main Terminations The HV side of the Transformers, Provide Plug in bushings. Alternately, the line connections may be brought out to stand off insulators and bushings. Bushings shall be made of non-hygroscopic material and shall conform to the requirements of IEC 60137. HV terminations shall be designed/ fitted with connectors to suit the incoming cables. The size of these cables shall be indicated in the datasheet. Gland plates shall be a minimum of 8 mm. thick, removable and undrilled. Cable entry shall be from the bottom. The LV side terminations shall be suitable for cable connection. LV terminals shall have barriers and shrouds

u ni ngun vo Phn cao th ca my bin p, cung cp ng lt u vo. Hay kt ni s gi cch xa phn cch in v ng lt. ng lt lm bng vt liu khng ht m v ph hp vi yu cu tiu chun IEC 60137. u ni cao th c thit k/ gn vi u ni thch hp cho ng cp vo. Kch thc nhng dy cp ny c ch ra trn trang s liu. Np m dy ti thiu 8mm, c th tho di c v khng c l. ng cp vo t pha di. u ni dy phn h th ph hp cho vic u ni cp. u ni cp vo h th ming chn v u chp v c khong cch gia cc pha v trung




fitted and have sufficient clearance between all phases and neutral to ensure that the required clearance cannot be reduced by the installation / termination of cables. The neutral point of the LV side star connected windings of the Transformers shall be solidly earthed via removable links at the respective LV Switchboard. LV terminal boxes shall be fitted with disconnecting chambers and/ or links.

tnh bo m rng khong cch yu cu khng b gim nh do lp t / u ni cp. im trung tnh ca cun dy kt ni hnh sao phn h th ca my bin p c ni t chc chn thng qua mt lin kt c th tho ri c ti t h th tng ng. Hp ni dy h th c gn trn phn tch ri v/ hay chi tit lin kt.

Auxiliary Terminations The cable for the connection of auxiliary trip/ alarm circuits shall be of 0.6/1 kV, minimum cross-sectional area of 2.5 mm2 with stranded high conductivity copper conductors. All cable cores shall be designated at each extremity using cable core markers in accordance with the wiring and schematic diagrams. Insulating barriers shall be provided between adjacent terminals for different voltage ratings. The height of the barriers and the spacing of terminals shall be such as to give adequate protection whilst allowing easy access to terminals. Terminal block insulation shall be of non-rigid, non-hygroscopic, non-tracking, non-inflammable material. Terminals shall be of vibration proof construction and incorporate captive pressure screws, which do not bear directly on the wire. The pressure screws shall have an inherent locking feature. Locking bars shall be fitted. All auxiliary circuits shall be cabled to a common marshalling box. Gland plates shall be removable and undrilled type and cable entry shall be from the bottom.

Cc im ni ph Dy cp cho vic u ni cc mch ph ngt/ bo ng in p 0.6/1 kV tit din ti thiu 2.5mm2 vi dy ng dn in cao nhiu tao. Tt c cc li cp c thit k ln nht s dng nh du li cp ph hp vi s n tuyn v s ko dy. Ming chn cch in c cung cp khong gia gn vi cc u ni cho cc cp in p khc nhau. Chiu cao ca cc ming chn v khong cch gia cc u ni bo v trong khi vn d dng cho php tip cn cc u ni. Cch in hp u ni bng vt liu khng cng, khng ht m, khng c rnh, khng chy. Cc u ni c cu trc chng rung v cc ai c p gi kt hp cht ch, n khng c p trc tip ln dy dn. Cc ai c p ny c nhng kha ring. Cc thanh kho c gn. Cc mch ph c i cp n hp thu dn. Np m l loi c th tho ri c v khng c l v ng cp vo t pha di.

Earthing All metal parts of the core, frame and tank etc. shall be maintained at earth potential. Two earth terminals shall be provided on the outer casing of the transformer. The earth connections shall consist of earth bosses together with M10 bolts and shall be located on the lower section of the transformer casing in opposite corners.

Ni t Tt c cc phn ca li, khung v bn, c duy tr ni t chnh. Hai u ni t c cung cp trn v ngoi ca my bin p. Cc u ni t bao gm im li ni t vi bulon M10 v c t ti phn thp v my bin p trn nhng gc i din.

Fastenings ISO metric nuts and bolts in accordance with the requirements of ISO 1111 and ISO 1112 shall be used. All fastenings shall be corrosion resistant. Termination box cover bolts shall be retained in place when undone.

ai c sit Cc bulng v ai c h mt ISO theo yu cu ISO 111 v ISO 1112 c x dng. Cc ai c sit c dng chng n mn. Cc bulon cho cc np hp ni dy vn c gi trn np khi tho ra.

Tropicalisation All electrical equipment and conductors shall be suitably protected to prevent deterioration due to adverse

Nhit i ho Tt c cc thit b v cc dy dn c bo v ph hp nhm ngn chn s suy gim cht lng do nhng iu kin




environmental conditions. mi trng bt li. Painting And Protective Coating The Transformers shall be painted/coated in accordance with the recommendations of the manufacturer for corrosion protection for 15 years. Connections, terminals and terminal bolts etc., shall be protected against corrosion.

Sn v ph lp bo v Cc my bin p c sn/ ph theo s gii thiu ca nh sn xut nhm bo v chng n mn cho 15 nm. Mi ni, u ni v cc bulon u ni dy..v.v.., c bo v chng n mn.

4 INSTALLATION 4 LP T

4.1 ASSEMBLY INSTALLATION 4.1 LP T

Fixing Before making interpanel connections, fix assemblies and metering equipment enclosures into position, level and plumb.

C nh Trc khi thc hin ni kt cc tm vch vi nhau, gn cc thnh phn v cc thit b o m ln v t ng v tr, bng phng v thng ng.

5 MARKING 5 GHI NHN

5.1 MARKING 5.1 NHN

General Provide labels including: - Manufacturers name - Type designation - Purchaser order number - Year of manufacture - Rated kVA and Voltage Ratio - Rated frequency and number of phases - Impedance voltage - Rated voltage of the auxiliary circuits - Degree of protection - Connection diagram - HV tapping voltages - Vector group

Tng qut Cung cp cc nhn bao gm: - Tn nh sn xut - Loi thit k - S n t hng ca ngi mua hng - Nm sn xut - nh mc kVA v t s in p - nh mc tn s v s pha - in p tr khng - in p nh mc ca cc mch ph - Cp bo v - S ni dy - in p iu chnh cao th - Nhm vc t.

Minimum lettering heights Main label: 25 mm. Danger, warning and caution notices: 10 mm for main heading, 5 mm for remainder.

Chiu cao ch ti thiu Nhn chnh: 25 mm. Cc thng bo nguy him, ch v cnh bo: 10 mm cho tiu chnh, 5mm cho phn cn li.

Label colours Generally: Black lettering on white background. Danger, warning labels: White lettering on red background.

Mu nhn Tng qut: Ch en trn nn trng. Cc nhn cnh bo, nguy him: Ch trng trn nn .

Fixing General: Fix labels securely. Method: Select from the following: - Screws and double-sided adhesive. Aluminium labels: Aluminium or monel rivets. Restrictions: Do not provide self-tapping or thread-cutting screws.

G lp Tng qut: Gn nhn chc chn. Phng php: La chn sau y: - Bt vt v dn hai mt Cc nhn bng nhm: Dng inh tn riv bng hp kim monel hay nhm. Gii hn: Khng c cung cp cc vis ren vo hay t ren.




Danger, warning and caution notices As per IEC standards.

Cc thng bo nguy him, ch v cnh bo Theo nh tiu chun IEC.

6 COMPLETION 6 HON TT

6.1 COMPLETION TESTS 6.1 TH NGHIM HON TT

General Carry out the following tests: - Electrical operation. - Dielectric

Tng qut Thc hin cc th nghim sau: - Th nghim vn hnh in - Th nghim cht cch in

6.2 MAINTENANCE 6.2 BO TR

General General: Carry out the following: - Monthly inspections and maintenance

work to maintain the assembly, including battery systems.

- Rectify faults, make adjustments, and replace consumable and faulty materials and equipment within 24 hours of notification.

Tng qut Tng qut: Thc hin nh sau: - Kim tra v thc hin bo tr hng

thng bo dng my bin th, bao gm c h thng c quy.

- Sa cha cc h hng, thc hin vic hiu chnh v thay th cc thit b, vt liu b h hng hay n nh k thay th trong thi gian 24 gi khi nhn thng bo.

Documents

C.03 Distribution Transformer - VN -Centrepoint