Download pdf - C.02 MV Switchgear - VN - Centrepoint

MEDIUM VOLTAGE SWITCHBOARDS

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

Centrepoint Page 1 of 16 of C.02 18 September 2007


T NG CT TRUNG TH

1 GENERAL 1 TNG QUAN The aim of this document is to give the detailed description of the Medium Voltage Switchboards to be used in the current project.

Mc ch ca ti liu l cung cp m t chi tit v t ng ngt trung th c s dng cho cng trnh ny.

1.1 FUNCTIONAL DESCRIPTION 1.1 M T The Medium Voltage Switchboards Scope of Works includes the detailed design, engineering, workshop drawings preparation and approval, manufacturing, factory testing, supply, delivery, installation, testing and commissioning and finally handover to the Employer of the Medium Voltage Switchboards rated as shown on the relevant drawings in the framework of entire project completion.

Phm vi cng vic t ng ngt trung th bao gm: Chun b cc bn v thit k chi tit, bn v k thut, bn v ch to v c duyt, thc hin cc kim tra ti nh my, ni sn xut, cung cp, giao hng, lp t, kim tra chy th v bn giao sau cng n ngi ch ca t ng ngt trung th vi cng sut c ch ra trn bn v lin quan trong khun kh ca vic hon thnh ton b d n .

1.2 CROSS REFERENCES 1.2 THAM CHIU CHO

General Worksection General Requirements Related worksections Worksection Electrical General Requirements Distribution Transformers Power Cables

Tng qut Cc yu cu tng qut ca phn cng vic. Cc chng lin quan Cc yu cu tng qut v in ca phn cng vic. Cc my bin p phn phi Cc cp ng lc

1.3 STANDARDS 1.3 TIU CHUN

General The Medium Voltage Switchboards shall comply with the latest issues of the following IEC recommendations: IEC 60056 High Voltage Alternating Current Circuit Breakers IEC 60129 High Voltage A.C. Switchgear and controlgear disconnectors (isolators) and earthing switches. IEC 60185 Current transformers for measurement and protection. IEC 60186 Voltage transformers for measurement and protection. IEC 60265-1 High voltage Switch for rated voltages above 1 KV and less than 52 KV IEC 60298 AC Metal Enclosed Switchgear and ControlGear for Rated Voltages above 1 kV and up to and Including 54 kV

Tng qut Cc t ng ngt trung th phi ph hp vi cc n bn mi nht do IEC gii thiu IEC 60056, My ct dng in xoay chiu cao th IEC 60129, ng ct in p xoay chiu cao th, iu khin dao cch ly v cu dao tip t IEC 60185, Bin dng cho o lng v bo v. IEC 60186, Bin p cho o lng v bo v. IEC 60265-1, ng ngt trung th cho in p nh mc trn 1KV dui 52KV IEC 60298, V t kim loi ca cc thit b ng ngt v cc thit b iu khin cho in p nh mc trn 1 kV n 54 kV. IEC-60282-1, Cu ch trung th.




IEC 60282-1 HV fuses IEC 60420 High voltage a.c. Switchgear and control gear switch - fuse combinations. IEC 60529 Degrees of protection provided for enclosures (IP Code) IEC 60605 Approval and test specification general requirements for electrical equipment. IEC 60694 High voltage A.C. Switchgear and control-gear-circuit breakers for rated voltages above 1000V.

IEC 60420, Thit b ng ngt trung th v cc thit b iu khin - kt hp cu ch. IEC 60529, Cp bo v cho v t (M IP) IEC 60605, Cc yu cu k thut tng qut v ph duyt v th nghim cho cc thit b in. IEC 60694, Thit b ng ngt xoay chiu trung th v ng ngt b phn iu khin cho in p nh mc trn 1000V.

1.4 DESIGN 1.4 THIT K

General The Medium Voltage Switchboards shall be designed in accordance with the above-mentioned standards, and applicable drawings. The Medium Voltage Switchboards shall be capable of continuous duty at rated voltage/frequency stated in this specification.

Tng qut T ng ngt trung th c thit k ph hp vi cc bn v p dng, v cc tiu chun nu trn. T ng ngt trung th phi c kh nng vn hnh lin tc ti in p/tn s c ni r trong c tnh k thut ny.

System Technical Parameters Rated voltage 24 kV Operating voltage 22 kV Frequency 50 Hz

Cc thng s k thut ca h thng in p nh mc 24 kV in p vn hnh 22 kV Tn s - 50 Hz

Main Substation MV Switchboard Rated voltage 24 kV Operating voltage 22 kV Frequency 50 Hz Rated power frequency withstand voltage - 50 kV - 50 Hz, 1 min Rated lightning impulse withstand voltage - 125 kV - 1,2/50 s Rated short-circuit breaking current - 20 kA - 1 s.

T ng ngt trung th chnh in p nh mc 24kV in p vn hnh 22 kV Tn s - 50 Hz Chu ng c in p 50 kV tn s 50 Hz, thi gian 1 pht. Chu c in p xung st 125 kV thi gian 1,2/50 s. Dng ct ngn mch nh mc 20 kA 1 giy.

Service conditions The Medium Voltage Switchboards shall be suitable for installation and operation in Vietnam and the environmental conditions described in the data sheets and project specifications. The Tenderer shall demonstrate facility for in country support and technical back up for the equipment offered. The manufacturer shall be responsible for ensuring that all equipment and components supplied are suitable for the operation and conditions stated. Where the manufacturer standard or preferred design option does not meet the operation or environmental conditions, the manufacturer shall give details of the technical changes and commercial impact of complying with the stated conditions. The Medium Voltage Switchboards shall

Cc iu kin phc v T ng ngt trung th ph hp cho vic lp t v vn hnh ti Vit Nam v cc iu kin mi trng c m t trong cc trang s liu v c tnh k thut ca d n. Nh cung cp phi chng minh c c c s h tr sn sng trong nc v d phng k thut cho cc thit b c trnh duyt Nh ch to c nhim v bo m rng tt c thit b v cc phn hp thnh c cung cp ph hp cho vic vn hnh v cc iu kin nu r trn. Ti nhng ch m tiu chun ca nh ch to hay s la chn thit k u tin khng thch hp vi cc iu kin hot ng hay iu kin mi trng, th nh ch to phi ch ra chi tit cc thay i k thut v cc nh hng thng mi n cc iu kin nh. T ng ngt trung th c thit k




be designed for ambient temperature of 40C.

cho iu kin mi trng 40C.

Safety and Reliability The Medium Voltage Switchboards shall be designed to minimise any risk of an internal short circuit and shall be of metal clad design. In the event of any internal arcing fault on a functional unit, the damage shall be confined to that unit so that the busbars and all other functional units are undamaged and operational. The Medium Voltage Switchboards design shall incorporate arc fault containment features. The level of arc containment test to which the switchboard complies shall be stated and any required features (e.g. vent flaps) shall be identified. The Medium Voltage Switchboards shall be designed in such a manner that all components shall be operated and maintained safely and shall not present a hazard to personnel or cause damage to other equipment. The metal enclosure shall be hermetically sealed and safe to touch. All MV and internal drive parts shall be maintenance-free for at least 10 years or 10 000 mechanical operations. Switchgear shall be arc-fault tested

S an ton v tin cy T ng ngt trung th c thit k nhm gim thiu ti a ri ro, nguy him ca s ngn mch bn trong v c v bng kim loi. Ngay c bt k dng h quang no bn trong b phn hot ng, s h hng s c gii hn trong b phn nh vy cc thanh ci v cc b phn hot ng khc khng b h hng v vn c th dng c. T ng ngt trung th c thit k kt hp vi cc tnh nng ngn chn dng r h quang. Kim tra cp dp dng h quang cho t trung th phi c ch r v bt k tnh nng yu cu no u c ch ra (v d cc cnh thng gi). T ng ngt trung th c th k theo cch m trong tt c cc phn hp thnh c vn hnh v bo tr an ton v khng c hin din bt k mi nguy hi no n ngi hay gy h hi n cc thit b khc. V t kim loi bt kn v an ton khi chm vo.

Tt c cc phn trung th v cc phn chuyn ng bn trong th hot ng (khng cn bo tr) ti thiu 10 nm hay 10 000 ln vn hnh c kh. Phn ng ngt phi c kim tra r-h quang.

Submission The Contractor shall submit for the Engineers approval the following workshop drawings and calculations: - Single Line Diagram - Protection Diagram - Calculation of prospective relay

settings - 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

- Fixing details for floor or wall mounting.

- External and internal paint colours and paint systems.

- Construction and plinth details, ventilation requirements

- Engraving Mimic Diagram

trnh Nh thu s trnh nhng tnh ton v bn v thi cng c s chp thun ca k s: - S n tuyn - S bo v - Tnh ton cc ci t r le. - Kiu, s m en v nh mc cho

cc b phn lp rp. - Cc kch thc chi tit. - Cc cng on vn chuyn, sp

xp chung, mt bng, mt ng pha trc v mt ct ca tng b phn.

- Nhng ch nh ra ca cc b phn c th nh hng n cc khong khng hay cc thao tc khng ch , nh mc quai, tay nm.

- Chi tit bt vo sn hay gn trn tng.

- H thng sn v mu sn bn trong v bn ngoi.

- Cc chi tit b my v kt cu, cc yu cu thng gi.

- S ch th.




- Manufacturers name - Type designation - Purchaser order number

- Tn nh ch to. - La chn loi. - S n t hng.

2 QUALITY 2 CHT LNG

2.1 MAIN OFFER 2.1 CHO HNG CHNH The Main Offer shall comprise a quotation including: - The technical proposal to meet the

Specification - Proposed variances with respect to

the Specification - This document shall be

accompanied by at least the following:

- Technical documents presenting the equipment

- Single-line diagrams of all the switchboards

- Low voltage functional diagrams - Dimensional and layout drawings,

with mounting and cable running - An accurate representation of the

front view of the equipment - The list of test certificates related to

the requested performances - The services associated with

equipment supply - Any options, with prices and impact

on equipment availability time - Operating and servicing documents - The list of spare parts with prices,

indicating the average delivery lead times

- Warranty terms Before an order is placed, the supplier will be requested to supply the complete wiring diagrams, as well as the engineering and installation documents.

Bng cho chnh bao gm mt bo gi c: - Phng n k thut p ng cc

Qui nh k thut. - Cc khc bit ngh i vi qui

nh k thut. - H s trnh phi i km ti thiu

cc yu cu sau: - Ti liu k thut ca thit b - S n tuyn ca tt c cc t

in - S chc nng h th - Bn v b tr v cc kch thc, c

cc khung gi v i cp - Bn v chnh xc mt trc ca

thit b. - Danh sch cc giy chng nhn

th nghim lin quan n hiu sut yu cu.

- Cc h thng lin quan n cung cp thit b

- Cc ty chn, vi gi v tc ng trn thi gian nhp hng ca thit b

- Ti liu vn hnh v bo dng - Danh sch cc ph tng d phng

vi gi, th hin vi thi gian giao hng trung bnh.

- Cc iu khon bo hnh Trc khi t hng, nh cung cp c yu cu cung cp ton b yu cu u dy, cng nh cc ti liu k thut v lp t.

2.2 SUBMISSION 2.2 TRNH The Contractor shall submit for the Engineers approval the following workshop drawings and calculations: - Single Line Diagram - Protection Diagram - Calculation of prospective relay

settings - 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

Nh thu s trnh nhng tnh ton v bn v thi cng c s chp thun ca k s : - S n tuyn - S bo v - Tnh ton cc ci t r le. - Kiu, s m en v nh mc cho

cc b phn lp rp. - Cc kch thc chi tit. - Cc cng on vn chuyn, sp

xp chung, mt bng, mt ng pha trc v mt ct ca tng b phn.

- Nhng ch nh ra ca cc b phn c th nh hng n cc khong




may affect clearances or inadvertent operation, such as handles, knobs

- Fixing details for floor or wall mounting.

- External and internal paint colours and paint systems.

- Construction and plinth details, ventilation requirements

- Engraving Mimic Diagram - Manufacturers name - Type designation - Purchaser order number

khng hay cc thao tc khng ch , nh mc quai, tay nm.

- Chi tit bt vo sn hay gn trn tng.

- H thng sn v mu sn bn trong v bn ngoi.

- Cc chi tit b my v kt cu, cc yu cu thng gi.

- S ch th. - Tn nh ch to. - La chn loi. - S n t hng.

3 MANUFACTURING 3 SN XUT

3.1 MANUFACTURER 3.1 NH SN XUT The Medium Voltage Switchboards and their components shall be manufactured in the factory(ies) certified with ISO 9001 certificate with at least 10 years experience in the specified equipment production.

T in trung th v cc ph kin phi c sn sut trong nh my c chng nhn ISO 9001 vi ti thiu 10 nm kinh nghim trong sn xut thit b qui nh.

3.2 MANUFACTURING TESTS 3.2 CC TH NGHIM TI NH MY

General The equipment may be inspected during manufacturing in any of the plants, which are involved in the related manufacturing. The Contractor shall make provision in his rates to cover the Engineer expenses for such inspection. The equipment shall be delivered with all the documents required for installation, testing, commissioning, operation and servicing-maintenance. The Contractor shall notify the Engineer so that inspections may be conducted at the following stages: - Fabrication and painting completed. - Factory assembly completed, with

busbars exposed and functional units assembled.

- Assembly ready for routine testing and dispatch.

- Assembly installed and connected. - Acceptance and handover. Type Tests The Contractor shall submit for the Engineers approval with the proposed manufacturer Medium Voltage Switchboards Type Test certificates from independence laboratory (KEMA or equivalent). The Contractor shall present the following type testing certificates: - Impulse dielectric withstand test - Dielectric withstand at power

Tng qut Thit b c kim tra trong qu trnh sn xut trong bt k nh my no tham gia vo qu trnh sn xut. Gi trng thu bao gm chi ph cho Nh t vn thc hin nhng chuyn i kim tra nh vy. Thit b phi c giao hng cng vi tt c cc ti liu yu cu cho lp t, th nghim, chy th v nghim thu, vn hnh v bo dng. Nh thu thng bo cho Nh t vn sao cho vic th nghim c th thc hin theo cc bc sau: - Hon tt ch to v sn. - Hon tt lp rp ti xng, vi

thanh ci gn ni v lp rp cc thit b hot ng.

- Lp t sn sng cho th nghim thng l v gi i.

- Lp t v u ni xong. - Chp thun v bn giao. Th nghim mu Nh thu phi trnh duyt cho Nh t vn giy chng nhn th nghim mu t in trung th ca nh sn xut t phng th nghim c lp (KEMA hoc tng ng) Nh thu phi trnh cc giy chng nhn th nghim mu sau: - Th nghim xung cch in




frequency test - Overheating test - Admissible short time current

withstand test - Mechanical operation test - Degree of protection check - Electromagnetic compatibility check

(EMC test) - Switchgear device breaking capacity

checks - Switchgear device making capacity

check

Routine Testing All equipment covered by this specification shall be subject to the Engineers inspection at the manufacturers works. The manufacturer shall notify the Engineer fourteen (14) days in advance when the tests are to be performed. Carry out the following tests: - Assemblies: Electrical and

mechanical routine function tests at the factory using externally connected simulated circuits and equipment.

- Dielectric testing: - Functional testing: Operate

mechanical devices, relays, protection, interlocking and alarm equipment.

- Primary and secondary current injection test

- Insulation resistance test - AC voltage/Power frequency one

minute test - Impulse voltage test - Wiring continuity test - Functional test of all components All test reports/certificates shall be submitted to Engineer within fourteen (14) days of the completion of such tests. Test reports and certificates shall be approved by the Engineer prior to the equipment leaving the factory. If the test results show that any equipment of the purchase order is not met, Supplier shall make necessary correction to the satisfaction of the Engineer before acceptance is made.

- cch in tn s cng sut th nghim.

- Th nghim qu nhit - Th nghim chu ng dng ngn

mch chp nhn - Th nghim thao tc c kh - Kim tra mc bo v - Kim tra tnh tng thch in t - Kim tra cng sut ngt ca thit

b trong t - Kim tra cng sut hot ng ca

thit b trong t.

Th nghim thng thng Tt c cc thit b bao gm trong ti liu k thut ny ty thuc vo kim tra bi Nh t vn ti xng ca nh sn xut. Nh sn xut phi thng bo cho Nh t vn 14 ngy trc khi cc th nghim c thc hin. Thc hin cc th nghim sau: - Cc t in: Cc th nghim c v

in thng thng ti nh my bng cch s dng cc mch in, cc thit b m hnh kt ni t ngoi.

- Th nghim lp cch in: - Th nghim chc nng: vn hnh

cc thit b c kh, rle, bo v, kha lin ng v thit b bo ng.

- Th nghim dng vo s cp v th cp

- Th nghim in tr cch in. - Th nghim tn s cng sut/in

p xoay chiu trong mt pht. - Th nghim xung in p . - Th nghim s lin tc ca dy. - Th nghim hot ng cc b phn

hp thnh. Tt c cc giy chng nhn/ bo co th nghim c trnh ln Nh t vn trong vng 14 ngy sau khi hon tt th nghim. Cc giy chng nhn v bo co th nghim phi c s ng ca Nh t vn trc khi thit b xut xng. Nu kt qu th nghim ch ra bt k thit b no theo yu cu ca Nh t vn khng t yu cu, th nh cung cp phi thc hin cc chnh sa cn thit tha mn Nh t vn trc khi s chp thun c duyt.




3.3 SWITCHBOARDS TYPE 3.3 LOI T IN

Main Substation The Medium Voltage Switchboards shall be indoor type unit designed with the minimum acceptable degree of ingress protection (IP) for electrical equipment and devices shall be as IP31. The Medium Voltage Switchboards shall be free-standing, floor mounted, and all switching operation shall be carried out from the dead-front operating panel. Live line test facilities shall be available on the panel front. Drive mechanism and current transformers secondary circuits shall be freely and safely accessible.

T chnh T ng ngt trung th l loi t t trong nh c thit k vi cp c th chp nhn ti thiu ca bo v tip xc (IP) cho cc thit b v cc dng c s l IP31. T ng ngt trung th l loi t ng, gn trn sn, v tt c vn hnh ng ngt c thc hin t mt trc t vn hnh. Cc phng tin kim tra ang c in c gn pha trc mt t. Cc c cu chuyn ng v cc mch th cp ca cc bin dng o lng c t do v c th tip cn an ton.

3.4 FUNCTIONAL UNITS 3.4 CC KHI CHC NNG

Disconnector and Fuse switch HV fuses for each phase Indicating contacts for blown fuse Interlock to prevent access to transformers if earthing switch is not closed. LV fusing

MV Ring Main Units Rated current of ring isolating switches and network busbars 630Amp or as indicated on single line drawings Vermin proof Capacitance coupled neon indicators for monitoring status of each cable connection and phase. 2 load break/fault make ring isolating switches Circuit breaker tee off(s) for connection to the transformers Type tested for arc fault containment of cable connection compartments. Steel frame mount to suit the MV cable reticulation system Plug in MV cable terminations utilising a proprietary heat shrink system Auxiliary contacts on all ring switches and circuit breakers for remote monitoring with contacts brought out to identified terminal strips.

Dao ct v cu ch Cu ch trung th cho mi pha Tip im hin th cho cu ch. Kho lin ng chng tip xc vi my bin p nu li dao tip t khng c ng. Cu ch h th

T mch vng trung th Dng nh mc cho cu dao cch ly v thanh ci l 630A. Chng cn trng. Trang b n hin th cho mi im ni cp v pha. 2 cu dao ct cho cch ly mch vng. My ct ( kiu T) cho im ni xung my bin p. Th nghim mu cho chu ng h quang ca ngn ni cp. V kim loi c lp t ph hp vi mng phn phi trung th. u cp trung th c bo v bng ng cch in ng quy cch. Cung cp cc tip im ph cho tt c cc cu dao v my ct theo di t xa vi cc tip im c ly ra t cc tip im ct nh.

3.5 CURRENT TRANSFORMERS 3.5 BIN DNG The Current Transformers for protection and measurements shall be based of the conventional type toroidal Current Transformers of the single or multi-ratio type, mounted inside the medium-voltage enclosure with grounded cores.

Bin dng cho bo v v o c l cc bin dng loi quy c mt hoc a t l, c gn bn trong t trung th vi li tip t.




The rated secondary current of toroidal Current Transformers shall be 1 A. The toroidal Current Transformers shall have secondary terminals outside the medium-voltage enclosure, mounted in suitable, accessible terminal boxes. All secondary leads of all Current Transformers must be wired to shorting-type terminals on the terminal strip in the local control cubicle of each bay. The Current Transformers shall be 0.5 Class or better.

Dng th cp nh mc ca bin dng l 1 A. Bin dng c cc u ni th cp pha ngoi v t trung th, c gn trong cc hp thun tin, c th tip xc c. Tt c cc thanh ch th cp ca tt c cc bin dng c mc vo cng loi ngn mch trong di tip xc trong t iu khin ti ch trong mi khu. Cc bin dng l loi cp 0.5 hoc tt hn.

3.6 VOLTAGE TRANSFORMERS 3.6 BIN P O The Voltage Transformers for protection and measurements shall be of RC-divider type. They shall be mounted directly on the medium-voltage enclosure with plug-in contacts to allow easy removal. The secondary terminals of the Voltage Transformers shall be located in easy accessible, grounded terminal boxes on the voltage transformer itself. The secondary connections must be wired to a terminal strip in the local control cabinet. The Voltage Transformers shall be 0.5 Class or better. Current transformers and voltage transformers used for EVN revinue Metering shall be to EVN approval.

Cc bin p dng bo v v o c l loi RC r nhnh. Chng c gn trc tip trong hp t trung th vi cc cc u cm dng phch cm d dng cho vic hon chuyn. Cc u th cp ca bin p c t trong cc hp c ni t, d dng tip xc trong chnh my bin th. Cc u ni th cp phi c ni n di tip im trong cabin iu khin ti ch. Cc my bin th o l loi cp 0.5 hoc tt hn. Bin dng v bin p c s dng phc v cho o m ca in lc Vit Nam th phi l loi c in lc Vit Nam ph duyt.

3.7 LIGHTNING ARRESTERS 3.7 CHNG ST The Lightning Arresters shall be installed as shown on the drawings.

Cc thit b chng st c lp t nh th hin trn bn v.

3.8 AUXILIARY CONTACTS 3.8 CC TIP IM PH The switchgear shall be equipped with auxiliary indication contacts connected to terminals in the factory. The terminal blocks, which received the available auxiliary contacts, shall be located in the low voltage compartment.

T trung th c trang b cc tip im ch th ph ni n cc cc ni ti nh my. Khi u ni, ni nhn cc tip im ph ny, nm trong bung h th.

3.9 LOW VOLTAGE AUXILIARIES 3.9 CC THIT B H TH PH TR

The protection and control system shall also be equipped with: Test units for the injection of current or voltage into the transformer secondary circuits, installed on the front of the low voltage compartment: - 1 unit for voltage - 1 unit for measurement current

circuits - 1 unit for protection current circuits - 1 unit for the zero current circuit Low voltage protection circuit breakers,

H thng bo v v iu khin cng c trang b: Cc khi kim tra dng v p vo cc mch th cp ca bin th, c gn pha trc ca bung h th: - 1 b cho in p - 1 b o cc mch dng. - 1 b cho bo v cc mch dng. - 1 b cho cc mch c dng bng

khng. Cc cu giao bo v h th nm trong bung h th. Khng c dng cu ch




located in the low voltage compartment. Fuse protections are not acceptable. A "local-remote" selector switch shall be installed for integration in a remote monitoring and control system. The low voltage auxiliaries shall comply with the standards IEC 298 section 5-4 and IEC 694, article 5, section 5.4. The low voltage cables shall be of the self-extinguishing, 1000 V insulation class. Both ends shall be identified to facilitate checking during maintenance operations. For the current circuits, the cable cross-section shall 2.5 mm, and 1.5 mm for the other circuits.

bo v. Mt nt chuyn ti ch-t xa c lp t to s hp nht trong h thng gim st v iu khin t xa. Cc thit b ph tr tng thch vi cc tiu chun IEC phn 5-4 v IEC 694, ch 5 phn 5.4. Cc cp h th l loi t dp tt c cp cch in 1000 V. C hai u c nhn dng kim tra tnh nng trong sut thi gian bo tr. Tit din ct ngang ca cp cho cc mch dng l 2.5 mm, v 1.5 mm cho cc mch khc.

3.10 ENCLOSURE 3.10 V BC Steel enclosures: minimum 2.5 mm thick electro-galvanized sheet steel for Main Substation Medium Voltage Distribution Board. It shall be painted to provide protection against corrosion. The epoxy based paint shall have a thickness at least 50 microns and shall be applied at both side of all sheet metal. The colour shall correspond to the RAL colour range proposed.

V thp: thp tm m km tnh in dy ti thiu 2.5mm cho t phn phi trung th chnh. V thp c sn bo v n mn. Lp sn gc epoxy c chiu dy ti thiu 50 m, sn c hai mt ca tm kim loi. Mu sn ph hp vi di mu c a ra bi RAL.

3.11 ASSEMBLY 3.11 KT CU The Medium Voltage Switchboards shall be of the modular design for free combination and extension. They shall be rigid, ventilated, insect-screened enclosures consisting of panels, doors, or both, giving the designated enclosure, separation and degree of protection. The Medium Voltage Switchboards shall be single tier, floor mounted, free standing suitable for tropical indoor application in accordance to the requisition specification. The Switchboard shall be designed for ease of maintenance and operation with the height of equipment requiring regular operation and testing being kept to a minimum. The construction of the Medium Voltage Switchboards shall allow for future extensions at either end. Certified lifting lugs shall be provided in each shipping sections of the switchboard. All cubicles shall be manufactured from electro-galvanised steel sheets with a minimum thickness of 2.5 mm on a framework of folded sheet steel or structural sections. The Switchboard construction shall be such that no distortion occurs when it is being lifted by hoist or moved into position on rollers.

T ng ngt trung th c thit k thnh tng Modul c th d dng kt hp v m rng. V t l loi cng, c thng gi, c li chng cn trng trn vch t, ca t, hay c c hai, c v t theo thit k, c tch ring v theo cp bo v. T ng ngt trung th l loi n dy, t trn sn, t ng ph hp vi cc ng dng t trong nh ti cc vng nhit i tu theo cc i hi ca chi tit k thut. T ng ngt c thit k d dng cho vic bo tr, v vn hnh vi chiu cao ca thit b cn c th nghim v vn hnh mt cch thng xuyn l thp nht. Cu trc ca t ng ngt trung th cho php m rng c hai u trong tng lai. Mc nng bo m c cung cp trong cc cng on vn chuyn ca t. Tt c cc khi c lm t thp tm m km vi chiu dy ti thiu 2.5 mm trn khung thp gc hay trn cc on thp kt cu. Cu trc t ng ngt c ch to sao cho khng th vn mo khi c nng ln bng cn trc hoc c di chuyn vo v tr bng con ln. Cc b phn ghp thnh c dng c chng minh bng thit k c tin cy phc v cao v khng cn bo




The components used shall be of proven design with high service reliability and maintenance free long life features. Where relevant, components shall have flame retardant properties. Gland plates and enclosure panels shall be provided with captive nuts or screws.

hnh trong sut thi gian s dng. nhng ni c lin quan, cc thit b phi c tnh cht ngn la lan qua. Gi v cc vch t c gn gi bng ai c v inh vt.

3.12 EARTHING 3.12 NI T

General An earthing bar of hard drawn, high conductivity copper shall be installed the full length of the switchboard in the bottom compartment. All metallic, non-current carrying parts of the switchboards shall be effectively and securely connected to this earthing bar. All gland plates shall be earthed to the earth bar. Earthing bolts, lugs, nuts and spring washers shall be provided at each end of the bar suitable for the connection of 1x240 mm2 earthing cables to the external main earthing grid. All doors and covers of the switchboards shall be effectively earthed using flexible connections. An integrally mounted three phase earthing switch, capable of making and carrying the full perspective short circuit current and suitable for local manual operation shall be provided on the cable side of all Medium Voltage switching devices. Earthing facilities for the earthing of the busbar system of each section shall also be provided.

Tng qut Mt thanh ni t bng ng cn ngui v c dn in cao c gn ti pha di, dc theo chiu di ca t ng ngt. Tt c cc phn bng kim loi khng mang in ca t ng ngt c kt ni mt cch hiu qu v chc chn vo thanh ni t ny. Tt c cc gi u c ni t qua thanh ni t. Bulng, ai treo, ai c v vng hm c ch to tai hai u ca thanh ni t ph hp cho vic kt ni vi cp ni t 1x240 mm2 n cc thanh ni t chnh bn ngoi. Tt c cc ca v v bc ca t ng ngt u c ni t hiu qu thng qua cc dy ni t mm. Mt li tip t chung cho ba pha, c kh nng chuyn ti c dng ngn mch ln nht v ph hp cho cc vn hnh thng thng ti ch c gn ti pha c cp ca tt c cc thit b chuyn mch trung th. Thit b ni t cng c trang b cho mi on ca h thng thanh ci.

Earth Continuity The earthing bars of each of the cubicles making up the switchboard shall be interconnected by a set of busbars which shall be connectable outside the switchboard and extend over its full width. The cross-section of the busbars shall be determined so as to withstand the rated short-circuit current of the switchgear in accordance with IEC 60298 recommendations. The earthing bar shall be designed for connection to the main earthing bar of the substation without dismantling any of the bars. Effectively bond equipment and assembly cabinet metal frame to the protective earth conductor. Strip painted surfaces and coat with corrosion resistant material immediately before bolting to the earth bar. Provide serrated washers under bolt heads and nuts at painted, structural metal-to-metal joints.

Ni t lin tc Cc thanh ni t ca mi khi ca t ng ngt c kt ni vi nhau bng mt b thanh ci c th kt ni bn ngoi t ng ngt v m rng n ht chiu di ca n. Tit din ct ngang ca thanh ci c tnh ton c th chu ng c dng in ngn mch ca t ng ngt theo cc khuyn co ca IEC 60298. Thanh tip t c thit k ni n thanh ni t chnh ca trm m khng cn d b phn no ca thanh. Ni mt cch hiu qu thit b v khung kim loi ca t vo thanh bo v ni t. Co lp sn b mt v ph mt lp vt liu chng n mn ngay trc khi gn bulng vo thanh ni t. Cung cp long en rng ca pha di u b-lng v inh vt ti ch sn cc kt ni kim loi n cu trc kim loi.




Potential Gradient Control System The building floor or concrete slab, housing Medium Voltage Switchgear, Switchboards, Distribution Transformers or other electrical equipment of 1 kV service voltage or above shall be provided with a potential gradient control system. This system shall be composed of a network of round steel bars of approximately 8 mm diameter and a mesh width not exceeding 5 m, to be laid in the final concrete slab approximately 5 cm below floor level. The Potential Gradient Control System shall be connected with the sub-grade earthing system.

H thng iu khin bin thin in th Sn nh hoc tm b-tng, ni t cc t ng ngt trung th, my ct v cc bin p phn phi hoc cc thit b in khc c in p 1 kV hoc trn 1kV c cung cp mt h thng iu khin bin thin in th. H thng ny gm c mt h thng cc thanh thp trn vi ng knh xp x 8 mm v mt li rng khng qu 5 m c t trong tm btng cui cng thp hn mc sn nh xp x 5 cm. H thng iu khin bin thin in p c kt ni vi h thng ni t cp thp.

Earthing of the Power Circuit Cable earthing shall be carried out by an earthing switch with short-circuit making capacity, in accordance with IEC 60129 recommendations. It shall be possible to operate the earthing switch when the switch or disconnector is open. A padlocking system shall be provided to lock the earthing switch in either open or closed position. The position of the earthing switch shall be clearly visible from the front of the cubicle. Mechanical interlocking systems shall be provided to prevent incorrect operations such as the closing of the earthing switch with the switch or disconnector in closed position. The use of keyed or electric locks to actuate the above mentioned interlocking system shall not be accepted.

Ni t ca cc mch ng lc Cp ni t c ni bng mt cu giao tip t c kh nng chu c dng to ngn mch tng ng vi cc khuyn co ca IEC 60129. C th vn hnh cu giao tip t khi cu giao hoc my ct ang h mch. H thng kho mc c trang b kho cu giao tip t c ti v tr ng ln m. V tr ca cu giao tip t c th nhn thy mt cch r rng t mt trc ca khi. H thng kho lin ng c kh c cung cp ngn cc vn hnh sai nh l vic ng cu giao tip t trong khi cu giao hoc my ct ang v tr ng. Vic s dng cha hoc kho in khi ng h thng kho lin ng c cp trn khng c chp nhn.

3.13 CABLE ENTRIES 3.13 LI CP VO The Medium Voltage Distribution Boards shall cable entry facilities within incoming and outgoing sections. Provision shall be made for sufficient clear space for cables not to be stressed or impose on there bending radius. The Manufacturer shall specify the cable entry trench depth. The gland plates shall be fitted with gaskets to maintain the degree of protection, materials: pre-drilled 1.6 mm thick electro-galvanised steel.

T phn phi trung th cung cp cc tin ch d dng cho i cp trong cc phn vo v ra. Cung cp y khong khng trong t cp khng b chn p hay tc ng trn bn knh b cong. Nh ch to s ch ra chiu su mng cp vo. Cung cp tm bt phng c giong t cp bo v, vt liu: thp dy 1.6mm m in- km.

3.14 CABLE DUCTING 3.14 NG CP The Contractor shall design and construct cable ducting facilities within the premises of Medium Voltage Switchboard Chamber for incoming and outgoing cables. Provide sufficient clear space for cables not to be stressed or impose on there bending radius.

Nh thu s thit k v thi cng ng cp bn trong ranh gii ca khoang trung th tin li cho cp vo v ra. Cung cp cc khong khng gian trng cn thit cp khng b chn p hoc ko cng trong nhng khc quanh ca chng.




3.15 COVER AND GLAND PLATES 3.15 V BC V GI The manufacturer shall make allowances for removable gland plates fitted with gaskets to maintain the degree of protection made from 1.6 mm thick electrically galvanised steel.

Nh sn xut cng cung cp cc tm m c giong duy tr bo v t tm thp c m bng in dy 1.6 mm.

3.16 DOORS AND COVERS 3.16 CA V V BC The adjacent doors shall allow space for both to open to 90o at the same time. The single right angle return shall be implemented on all sides and fit suitable resilient sealing rubber to provide the degree of protection and prevent damage to paintwork. The all doors shall be fitted with corrosion-resistant lever-type handles, operating a latching system with latching bar and guides strong enough to withstand explosive force resulting from fault conditions within the assembly. Earth continuity shall be maintained to door in all positions. The covers shall be fixed to frames with at least 4 fixings. Provide corrosion-resistant acorn nuts if the cover exceeds 600 mm in width. Rest cover edges on the cubicle body.

Cc ca lin nhau phi c cc khong trng m n 90o cng mt lc. Cung cp nhng gc vung quay tr v trn cc mt v gn nhng cao su co gin thch hp t cp bo v v ngn chn s trc sn. Tt c cc ca c lp tay nm kiu cn gt chng n mn, tc ng ln h thng cht gi bng cc thanh cht v ray dn hng mnh chu c lc n mnh gy ra do iu kin h hng bn trong thit b. S lin tc ni t c thc hin cho ca mi v tr. Cc tm v t c gn vo khung sn ti t nht 4 ch. S dng ai c acorn chng n mn nu tm np rng qu 600mm. Cc np cn li th cu vo than khi t.

3.17 BUSBARS 3.17 THANH CI The main circuit supply busbars within assemblies, extending from incoming supply terminals to the line side of protective equipment for outgoing functional units and for future functional units. The busbars shall be installed in segregated enclosed compartments. No wiring equipment or devices shall be installed in the busbars compartments. The busbars shall be of hard drawn high conductivity bars made of tough pitched tinned copper alloy using electrolytic copper and have the same current rating throughout the length of the entire Switchboard. A fully fault rated earth bus shall be provided in the switchboard and the size shall be indicated in the offer. Sufficient supports made from non-hygroscopic insulation material capable of holding busbars at 105oC.to shall withstand thermal and magnetic stresses under maximum prospective fault currents. For active conductors calculation it shall be taken into account the thermal stresses due to short circuit current, assuming magnetic material enclosures located indoors in well-ventilated rooms and 90oC final temperature.

Cc thanh ci cp ngun chnh trong cc t in, ko di t u cp ngun n thit b bo v cho cc chc nng u ra v thit b chc nng cho tng lai. Cc thanh ci c lp t trong t ring bit. Khng c bt k thit b u dy hay dng c no gn trong ngn cha thanh ci. Cc thanh ci bng ng ko ngui, c dn in cao v c tnh dn in ng nht. Mt thanh tip t c cng sut p ng c hon ton dng s c c lp t trong t in v kch thc c ch ra trong khi cho hng. Gi bng vt liu cch in khng ht m c kh nng gi thanh ci 105oC, sc chu ng cc ng sut t v nhit khi c dng ngn mch ln nht sau ny. Tnh ton thanh dn pha phi tnh n ng sut nhit khi ngn mch, gi s v t bng vt liu t tnh, t trong nh thng thong tt v nhit sau cng 90oC. Thanh dn tip t bo v: Kch thc




The sizes of protective earth conductors shall be at least 50% of the rated short-circuit withstand current for 100% of the clearance time.

ti thiu 50% ca dng ngn mch nh mc sut 100% thi gian chu ngn mch

3.18 INTERLOCKING AND PADLOCKING

3.18 KHO LIN NG V KHO MC

In general the following minimum padlocking facilities shall be provided: - Panel door - Local trip/close switches (electrical /

mechanical) - Earthing switch in closed position The Switchboard manufacturer shall recommend and provide the details of the interlocking required for busbar earthing.

Ni chung cung cp ti thiu kho mc ti nhng ch sau: - Ca t in - Cng tc ng/ngt ti ch (c

kh/in) - Cng tc tip t v tr ng Nh cung cp t in gii thiu v cung cp chi tit cc yu cu v kha lin ng cho thanh ci tip t.

3.19 FASTENINGS 3.19 BULONG ISO metric nuts and bolts in accordance with the requirements of ISO 1111 and ISO 1112 shall be used in the construction of the Switchboard. All fastening shall be corrosion resistant. Cover bolts shall be retained in place when undone.

Cc ai c v cc bulng h mt theo tiu chun quc t ISO1111 v ISO1112 c s dng thi cng t in. Tt c cc bulong l loi chng n mn. Bulng cho np che l loi vn dnh trn np khi tho ra.

3.20 OPERATION 3.20 VN HNH

General In order to make the Medium Voltage Switchboard simple and safe to use, the following construction requirements must be met:

Tng qut t trung th n gin v an ton cho s dng, cc yu cu sau phi c p ng khi ch to:

Operating Mechanisms All operating mechanisms and access points shall be on the front of the functional units, in particular, cable and busbar connections must be accessible via the front.

C cu thao tc Tt c cc c cu cn thao tc v cc im tip cn phi t pha trc ca thit b, c bit l u ni cp v thanh ci phi tip cn c t pha trc.

Instruction Guide The operating procedures for the most current operations must be described on the front of each functional unit. This shall be described exclusively in the form of explicit symbols and colour codes.

Hng dn vn hnh Trnh t thao tc cho hu ht cc thao tc hin ti phi c m t pha trc ca mi thit b. iu ny c m t ring theo mu m mu v cc k hiu r rng.

3.21 LABELS 3.21 NHN Labels with essential markings shall include: - Manufacturers name - Switchboard type designation - Purchaser order number - Switchboard title and tag number - Year of manufacture - Service voltage, rated frequency

Dn nhn vi tn nh sau - Tn nh sn xut - Ch nh loi t in. - M s t hng ca ngi mua

hng - Tn t in v m s. - Nm sn xut. - in p hot ng, tn s nh

mc.




- Rated current of the busbar system - Rated voltage of the auxiliary

circuits - Rated peak and short time withstand

current and withstand time - Degree of protection - Designation labels: For other than

main assemblies, the designation label stating source of electrical supply shall be provided. All separate sections of enclosures shall be clearly identified.

- Dng nh mc cho h thng thanh ci.

- in p nh mc cho cc mch ph.

- nh mc cao im v dng ngn mch nh mc v thi gian chu dng ngn mch.

- Cp bo v. - Nhn tn: Cho cc b phn ngoi

t chnh, cung cp cc nhn tn ch ra ngun cp in. nh du tng phn ring ca v t.

4 INSTALLATION 4 LP T

4.1 GENERAL 4.1 TNG QUT Installation of the Medium Voltage Switchboards shall be carried out according to the manufacturers recommendations and relevant drawings and in conformity with IEE regulations and applicable IEC standards. The Switchgear manufacturer shall be capable of providing all the services necessary, from training of personnel to installation and full commissioning on site if required by the Engineer.

Lp t t trung th c thc hin theo cc khuyn co ca nh sn xut v cc bn v lin quan v tun th cc qui nh IEE v cc tiu chun p dng ca ICE. Nh sn xut t trung th phi c kh nng cung cp tt c cc dch v cn thit, t o to nhn s n lp t v chy th v nghim thu ton b trn cng trng theo yu cu ca Nh t vn.

4.2 TRANSPORTATION 4.2 VN CHUYN Each functional unit shall be set on and screwed onto a wooden floor. The units shall be individually protected against rain and dust by polyethylene wrapping, in which desiccant bags are placed. Wooden straps shall be used to protect against impact.

Mi thit b c t v bt bulon cht vo mt sn g. Thit b phi c bo v ring bit chng ma v bi bng cch bc polyethylene, trong c t cc bao ht m. Cc thanh g c s dng chu cc va chm.

4.3 HANDLING AND STORAGE 4.3 XP D V LU KHO The wooden floor onto which each functional unit is screwed should allow for handling by a forklift. The switchgear should be capable of being stored for as long as necessary in the following conditions: - Splashing water, wind, sand and all

direct chemical pollution - Humidity in compliance with that

defined for normal operating conditions

Sn g ca thit b phi c th chu c vic xp d bng xe nng. T in phi c kh nng chu c lu kho lu trong khong thi gian cn thit di cc iu kin: - Bn nc, gi, ct v tt c cc

nhim ho cht trc tip - m nh l trong iu kin hot

ng bnh thng theo qui nh

5 FIELD TESTING 5 TH NGHIM TI CNG TRNG

5.1 INSPECTION 5.1 NGHIM THU

General Field testing of the Medium Voltage Switchboards shall be carried out by the

Tng qut Vic th nghim t ng ngt trung th ti cng trng c thc hin bi cc




code of InterNational Electrical Testing Association (NETA).

Visual and Mechanical Inspection Circuit Breakers sizes and types shall be verified in correspondence with drawings as well to the Circuit Breakers addresses for microprocessor- communication packages. Current and Voltage Transformers ratios shall be verified with the related drawings. Bus connections shall be inspected for high resistance using: - Low-resistance ohmmeter - Tightness of accessible bolted

electrical connections by calibrated torque-wrench method

- Performance of the thermographic survey

Correct operation and sequencing of electrical and mechanical interlocking shall be confirmed by: - Attempt closure on locked-open

device - Making key exchange with devices

operated in off-normal position Insulators shall be examined for, evidence of physical damage or contaminated surfaces.

Electrical Inspection Insulation-resistance tests shall be performed at 1000 volts dc on all control wiring. For units with solid-state components it shall follow manufacturers recommendations.

Control Distribution Transformers Measurements from winding-to-winding and each winding-to-earth shall be done. Test voltages shall be in accordance with specified by manufacturer. Correct function of control transfer relays located in switchgear with multiple power sources shall be verified.

Voltage (Potential) Transformers Measurements from winding-to-winding and each winding-to-earth shall be done. Test voltages shall be in accordance with specified by manufacturer. Secondary voltages shall be verified.

Tests Values Bus connection resistances to values of similar connections shall be compared. Bolt-torque levels shall be in accordance with manufacturers recommendations.

qui nh ca Hip Hi Th Nghim in Quc T (NETA).

Kim tra bng mt v c kh Kch c v chng loi ca cu dao phi c xc minh l tng thch vi cc bn v cng nh l cc cu dao cho cc khi vi x l-thng tin lin lc. Cc t s bin p v bin dng c xc minh vi cc bn v lin quan. Cc kt ni thanh ci c kim tra in tr cao s dng: - My o Ohm in tr thp - cht ca u b-lng ni in

bng phng php cn chnh momen xon.

- Hin th ca my o biu nhit. Xc nhn s vn hnh v sp xp th t ng ca kho lin ng in v c bng: - ng th thit b m c

kho. - Thay i kho vi cc thit b

c vn hnh v tr thng ng.

Cc cch in c kim tra v h hng vt l hoc d b mt.

Kim tra in Cc th nghim in tr-cch in c thc hin ti in p 1000 V DC trong tt c cc h thng dy iu khin. i vi cc thit b cu thnh kn, cc th nghim s theo s ngh ca nh sn xut.

Cc my bin th phn phi iu khin Cc o c gia cc cun dy vi nhau v gia cun dy v ni t c thc hin. Cc th nghim v in p s c thc hin da trn s ch dn ca nh sn xut. vn hnh chnh xc ca cc rle iu khin chuyn i trong t ng ngt cng c th nghim

My bin th Cc o c gia cc cun dy vi nhau v gia cun dy v ni t c thc hin. Cc th nghim v in p s c thc hin da trn s ch dn ca nh sn xut. in p th cp cng c th nghim.

Cc gi tr th nghim in tr ca mi ni thanh ci c so snh vi cc gi tr ca cc mi ni tng ng. xon ca b-lng phi ph hp vi




Microhm or millivolt drop values shall not exceed the high levels of the normal range as indicated in the manufacturer's published data. If manufacturer's data is not available, investigate any values which deviate from similar bus by more than 25 percent of the lowest value. Insulation-resistance values for bus, control wiring, and control power transformers shall be in accordance with manufacturer's published data. Values of insulation resistance less than manufacturer's minimum should be investigated. Overpotential tests should not proceed until insulation-resistance levels are raised above minimum values. The insulation shall withstand the overpotential test voltage applied.

cc gii thiu ca nh sn xut. Cc gi tr chnh lch Microhm hoc millivolt khng vt qu cc mc cao ca khong thng thng c tm thy trong cc d liu chung ca nh sn xut. Nu d liu ca nh sn xut khng c sn th kim tra bng cc gi tr bt k t cc thanh ci tng ng trch khi gi tr thp nht khong hn 25%. Cc gi tr cch-in tr ca cc thanh ci, cc dy iu khin, v cc bin th iu khin tng thch vi cc d liu ca nh sn xut. Cc gi tr ca in tr cch in thp hn cc gi tr ti thiu ca nh sn xut s c nghin cu kim tra. Cc th nghim qu p khng nn bt u khi cc cp in tr cch in cha c sa qu khi cc gi tr ti thiu. Cc cch in chu c cc in p ca th nghim qu p c p dng.

5.2 SITE TESTING 5.2 TH NGHIM TI CNG TRNH

In order to reduce commissioning time, the equipment proposed shall be designed so that the commissioning of each functional unit does not require an additional individual testing of each protection and measurement function. Testing shall be limited to: - Checking of the parameter settings

by direct reading - Checking of the connections to the

current and voltage sensors by secondary injection

- Measurement of residual current and voltage for configurations which use those values

- Checking of logical input/output wiring

- Switchgear device operation by push-button

- Pilot wire connection test

gim thi gian chy th v nghim thu, thit bi phi c thit k sao cho vic chy th v nghim thu ca tng thit b khng i hi thm cc th nghim ring bit ca mi tnh nng bo v v o lng. Th nghim phi c gii hn trong: - Kim tra cc thng s ci t bng

cch c trc tip - Kim tra cc u ni n cc cm

bin dng v p bng cch a vo dng th cp

- o dng d v in p cho cc cu hnh c s dng cc gi tr ny

- Kim tra dy vo v ra tn hiu - Thao tc cc thit b ng ct bng

cc nt nhn - Th nghim u ni n bo

6 COMMISSIONING 6 CHY TH V NGHIM THU The only settings required during the commissioning of the Medium Voltage Switchboards shall be parameter settings of the protections and the alarms on the protection and control unit.

Cc ci t trong qu trnh chy th v nghim thu t in trung th ch c l ci t thng s mch bo v v bo ng trn thit b iu khin v bo v.