Ministry of Electricity Planning and Studies Office Baghdad – Iraq
Specification No.
D-06
TECHNICAL SPECIFICATION OF KIOSK TYPE 11/0.4KV SUB-STATION 250, 400 & 630 KVA
REVISION
YEAR 2001
YEAR 2009
Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
1. SCOPE OF WORK Tenderers are invited for the design, manufacture, testing and supply of outdoor kiosk type S/S, accessories, spare parts. 2. GENERAL REQUIREMENTS The equipment shall be of first class quality and designed for continuous satisfactory operation as continuity of supply is of prime consideration. The design shall allow all necessary precaution for the safety of operation and maintenance personal. All equipment shall operate satisfactorily under variation of load, voltage and short circuit or other conditions which may occur on the system provided that these variations are within assigned ratings of the apparatus. All the equipment shall be designed to withstand the accidental short circuit. The equipment used shall be suitable for the following climatic conditions prevailing at site. 2-1 Ambient Temperature Highest maximum – in the shade Lowest minimum………………...…. Max. Yearly average ………………. Max. daily average ………………..
+ 55 deg . C. for about 6 Hours a day. –10 deg .C. + 30 deg .C. + 40 deg .C.
2-2 Sun Shine Temperature Metal object under direct Sunshine attain a temp, of ……….……
+ 80 deg .C.
2-3 Air Humidity Maximum ……………………… Minimum ………………………. Yearly average …………………
92 percent at 40 deg .C. 12 percent . 44 percent.
2-4 Altitudes From sea level up to
1000 m
2-5 Sand storms The equipment are subjected to strong and frequent sand storms. Adequate precaution must be taken to cater for this . 2-6 Condensation Enclosed compartments shall have the interior surfaces treated with approved materials. The interior surfaces including contactor or relay coils shall be treated in on approved manner to prevent mould growth. Such treatment should in no way interfere with the satisfactory operation of the equipment either electrically or mechanically
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
3.TECHNECAL SPECIFICATION 3-1 System data(Medium voltage) Nominal voltage 11000 volts Highest system voltage 12000 volt Short circuit Level 25 KA r.m.s 11kV Frequency 50 Hz System 3- phase, 3 wire with neutral earthed through an earthing resistance of 21.1 ohms to limit the earth fault current to 300 amps 3-2 System data (Low voltage) Nominal voltage System Frequency Short circuit level
416/240 volts +4% , -10% 3- Phase , 4 Wire with neutral solidly earthed 50 Hz according to the transformer capacity
3-3 Standards The latest relevant issue of the INTERNATIONAL ELECTROTECHNICAL COMISSION (IEC) SPECIFICATIONS: Where these specifications are incomplete or not yet published then the national standards of tenderers country shall be considered & subject to our approval. 4. KIOSK TYPE SUBSTATION Each sub-station is to include both the 11 kV and 0.4 kV switches and a room for the Transformer. The whole unit is to be contained in an outdoor sheet metal and thickness not less than 2 mm with two polyester layers or equivalent . The sheet metal with structure of the kiosk is to have an extended double roof arrangement with high quality heat insulating material in between. The sheet metal structure is to be mounted on a rigid frame to ensure easy rigid final structure and successful operation. The complete unit must be transportable to site as single unit. It is preferable that the kiosk to be divided into three sections, high tension compartment, Transformer compartment, and L.T. compartment each compartment to be equipped with separate lockable door. The dimensions of the compartment without the base shall be not less than. Length: 2900 mm width: 2100 mm height: 2150 mm The minimum, clearance between the roof and the highest point of the transformer shall be not less than 550 mm: The type of ventilation is natural. Adequate natural ventilation to the separate compartments of the kiosk type installation with special attention to the transformer compartment which must be taken with atmost consideration. Color: Green/Gray (subjected to our approval.) • Degree of protection for MV & LV compartment: IP 55 • Degree of protection for transformer compartment: IP 31 The successful tenderer has to send complete civil works drawings of the base taking into consideration the suitable opening for cables entry with height of 25-50cm from ground level. The kiosk type s/s should be supplied completely with the required arrangement for the cable connections by the manufacturer between the H.V terminals of the transformer and the cable end box of the switch fuse and the L.T terminal with the transformer and the cable end box of the main L.T C.B of the transformer.
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
5. 11KV SWITCHGEAR 5-1 11 KV switch gear incorporated each kiosk substation is to form a ring main unit consisting of two switches for two incoming cable feeders or more according to tender requirements and one fuse switch for the transformer. The switch gear shall comply with IEC 60298, 60694, 60265, 60420 , and 60129 , and of the completely enclosed type , with (SF6) gas sealed insulated chamber or with vacuum interrupters with insulated bus-bar of 800 AMP rating 20kA r.m.s . The insulating of the bus bar in the air chamber should be either by cast resin or any other suitable material flame resistance (compound filled bus bar chamber will be rejected ). The switch gear shall be provided with suitable inter – locks and adequate safety devices to prevent access to the live compartment . Earthing device should be of built in type and shall be provided for earthing the cables . 5-2 Switch (non-automatic) suitable use for in conjunction with switch fuse to form composite ring main switch board . It is preferable that the switch to be of a single break type having ON/OFF and earth position with quick make and break features in all positions . The switch must be capable of making , carrying and breaking currents under normal circuit conditions which may include specified operating overload conditions and also carrying for a specified time currents under specified abnormal circuit conditions such as those of short – circuit . It may be capable of making , but not breaking short circuit currents . It must have continuous current rating not less than 630 AMP. • The operating mechanism shall be of local hand control spring – assisted type with lockable ON/OFF and Earth positions • Mechanical and indication ON/OFF and in addition to switch position indication. • Mechanical interlocking for Earthing switch is to be provided such that it cannot be closed unless the switch is in the off position and the front doors cannot be open unless the Earthing switch in (ON position). • Cables testing facilities are to be provided. • Potential indicators are to be provided with neon lamps and placed on the cable side in order to indicate whether the cables energized or not. Alternative facilities for providing such indication will be considered. The neon indication should be on the front of the switch. The switch panel should include: • Set of 800 amp insulated bus bar in air insulated bus bar chamber. • One Earthing switch of making capacity specification • One set of short circuit indication with mechanical reset operated on short circuit 4 time the rated current. • One set of earth fault indication with mechanical reset • Protection against high pressure when short circuit fault occur within switch gear. • One set of cable end box with gland suitable for XLPE ( cable up to 3 x150 mm2 ) Copper conductor complete with suitable connectors and all necessary jointing accessories should be supplied with the switch (Heat shrinkable or premold slip- on joint are accepted).
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
5-3 Fuse Switch The fuse switches should be hand – operated totally enclosed in line with the switch panel . The fuse switch shall be triple pole with provisions for automatic tripping incase of failure of any fuse . further more re closing cannot carried out unless the burnt fuse is replaced . The switch fuse must be capable of switching ON/OFF the normal load current and must have a continuous current rating not less than load current and must have a continuous current rating not less than 200 Amperes with a cartridge fuse according to the size of the transformer . • Its operating mechanism shall be of local hand control spring assisted type with lockable ON/OFF positions. • Mechanical indication ON/OFF to be free with operation and TRIPPING. The switch fuse include the following: • • • •
Set of 800A insulated bus bar in air insulated bus bar chamber One fuse switch not less than 200 Amp. rating. Three cartridges (HRC) with striker fuse of rating according to transformer rating. The earthing switch should be of type that earthing the fuse from both sides.
5-4 Fuses In general fuse links should comply with IEC 60420 The successful tenderer will be requested to insure selectivity between the L.T circuit breaker over current and short circuit protection and the time /current characteristic of the 11 kV HRC fuses 5-5 Short circuit Indication In arrangement for short circuit and earth fault indications is to be provided on each kiosk with indicating lamps or any other alternatives on the front door of the kiosk with proper cancellation facilities. The arrangement is to be done in such away that when a short circuit current passes through the bus bars of the substation it will be indicated in order to isolate the faulty part. 6. TRANSFORMER The tenderer is requested to insure that the compartment of the transformer is suitable also for installing the locally manufactured transformer 250, 400 & 630 KVA rating with following dimensions in mm: KVA 250 400 630
L 1230 1540 1660
W 750 1000 1200
H 1600 1900 2150
6-1 Transformer characteristics Rated output Duty Rated Voltage Frequency Inter phase connection Max temperature rise Cooling Vector group Off circuit tapping
250, 400, 630 KVA step down 11 / 0.416 kV 50 HZ Delta / star with neutral brought out 45 °C in top oil by thermometer 50 °C in winding by resistance. ONAN Dyn11 Five tapping for ± 2.5 % , ± 5% on H.T. winding . the mechanism must be of the robust design with click indicating position arrived during tap changing
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
The transformers are oil immersed, copper winding, outdoor type to be supplied complete with all necessary fittings , accessories , off load tap changer , insulating oil and spare parts ….etc. The transformers are to be hermetically sealed (bolted type) with bushing insulators on both H.T and L.T sides according to IEC 60076. The iron and cooper losses shall be evaluated while the comparing the prices. 6-2 CLIMATIC CONDITION : Ambient temperature: Highest maximum (in the shade) + 55 °C for about 6 hrs a day . Metal object under direct sunshine attain a temp of + 80 deg. °C Lowest minimum – 10 °C Maximum yearly average + 30 °C Maximum daily average + 40 °C
6-3 Fitting and accessories: • Terminal marking plate. • Tapping switch. • Valves 3/4 B.S.P fitted on cover and button of tank. • Thermometer pocket with thermometer with max. temp. measurement indicator and two separate free contacts. • Lifting lugs. • Pressure relief valve. • Earthling terminal on tank. • Rating and diagram plate to be chromium plated of the engraved type with KVA rating and serial number engraved inside the transformer at a suitable place. • Skid mounting. • Oil level indicator mechanical type located on the cover of transformer • Horn gaps on H.T. bushings • Suitable clamps on L.T. bushings. 7. CABLES AND CONNECTIONS The required arrangement for the connection between the M.V terminals of the transformer and cable end box of the switch fuse is to be such that the cable is to be jointed on the cable end side of the switch fuse by the manufacturer and a sufficient length of cable is left for jointing on the cable end side of the transformer by us during installation if the transformer supplied separately (not include in the tender). 8. 416 VOLT SWITC BOARD The low voltage switch board is to comprise number of outgoing circuit breakers, according to the attached single line diagram metering devices, relays and cable glands for outgoing feeders according to attached single line diagram. The low tension switch gear is to be totally enclosed and entirely protected against the danger of vermin and dust , the degree of protection is to be (IP 55) . The construction is to be with front access only . The switch gear shall be in corporate with the following: 8-1 Circuit Breaker The circuit breaker shall be (3-pole) MCCB comply with IEC 60157-1 category (2)not less than 35kA r.m.s short circuit current rating specified in the schedule attached herewith . The operating mechanism shall be of trip free type. The protection to be provided by adjustable thermal and magnetic release for over load and short circuit trip with time delay or standard type and compensation for ambient temp for the thermal element . A mechanical ON/OFF indication is to be provided for CB position . Provision for pad locking the door of the circuit breaker is to be provided and the operating handle to be engaged when the door is closed.
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
8-2 Selectivity The tenderer will have to insure that the protection setting of the circuit breaker will make it possible to obtain selective tripping between the L.T and the 11 kV sides. The selective tripping will have to be maintained through out the temp. Variations. 8-3 Metering current transformer: The current transformer shall be complying with IEC 60185 class1 for ammeters with ratio specified in schedule. 8-4 Power Factor Correction Equipment The equipment will be used to improve the power factor in factories or network where a large number of induction motors of different sizes are in service. It shall be placed in the same enclosure as the circuit breaker but with a separate access door. The bank of capacitors should be made of standard sizes of equal ratings with discharge devices. Capacitors with synthetic film dielectric are preferable. The control gear should consist of:A- Reactive power relay which can be set on power factors (0.8) lagging to (1) and which insure switching in & out capacitors according the set value of p.f. Switching from step to step must be delayed in such away that a capacitor can be connected to the mains before it is being sufficiently discharged. Burden of the relay should be small so that it is possible to use the metering C.T.S. B- Heavy duty air contactor of suitable ratings. AC3 type (160 Amp. For 50 kVAr capacitor , 80 Amp. For 25 KVAr capacitor) C- Protection by means of cartridge H.R.C fuses to disconnect the faulty equipment (120 Amp. For 50 KVAR rating, 60 Amp. For 25 KVAR rating) D- (Manual –off- Automatic ) switch. E- Pilot light for each feeder internal wiring should be numbered and colored for easy identifications. 8-4-1 Ratings of the basic equipment Item transformer rating – KVA 1250 2400 3630
capacitor rating- KVAR 100 200 300
No. of steps 4X25 4X50 6X50
9. DRAWINGS AND INSTRUCTION 9-1 The following documents shall be submitted in three copies with the tender documents in the English language. • Technical literature giving full description of the switch, switch fuse, L.T switch board offered with all details of the s/s and their contents. Also outline drawings with dimensions showing the front, side and top elevation of the substation. • Complete description of operating mechanism of the switch and switch fuse. • Type and routine test certificates. 9-2 The document to be furnished by the successful tendered in the English language include three copies of the order with C.D. • Schedule of the anticipated shipping dates • Foundation details • Installation drawing • Outlined drawings of the s/s • General arrangement, single line diagram, and schematic diagram of all equipment.
NOTE It must be noted that all drawing are subjected to approval before manufacturing. • The list of crates with shipping weights and dimensions
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
• All instruction for storing and cresting the materials • All instructions for maintenance, testing and commissioning of all relays and equipment. • One set of reproducible print on C.D disk AutoCAD file type plus one set of printed copies per S/S of all drawing , operation and maintenance instruction books , catalogs and renewal part lists , bound in a proper files 10- PACKING The supplier will pack or protect the goods in the most appropriate manner. He will be responsible for any loss or damage arising from careless packing or protection up to the place of final destination. After completion of the inspection and test at the factory each item shall be packed for export shipments. All parts provided for shipping purposes only and which are to be removed at the time of erection shall be conspicuously tagged The method of packing shall be such as to protect all and shall afford adequate protection against breakage or other injury , or loss due to breaking of cases or crates from time the item leaves the factory until finally installed at the substation during which time , the apparatus will travel by rail , by along sea voyage by rail or truck to the site of the substation . The apparatus will also undoubtedly stand on wharves and in the open during and in – between periods of transportation and will there be exposed to heavy rains hot sum , humidity and sudden changes of temperature . owing to numerous handling , the containers should be given to the equipment and especially the items having insulating material to prevent the injury due to moisture from sources external to the packing or from excessive condensation with the packing . 11- INSPECTION 1) The material with (compartment the M.V&L.T and the transformers ) be subject to inspection and test by our inspectors at any time during manufacturing . All testing and inspection shall be made at the place where the material manufactured. The manufacturer shall provide all inspection facilities for the site inspection and testing. The inspector shall have the right to reject any portion of the material at time during manufacturing if it does not meet with the requirements of this specification in all particulars. He shall have the right of over seeing the packing and shipping of all materials to be supplied 2) Test and manufactures work Tests at manufactures work shall comprise type tests and routine tests . A- Type Test These tests are in general, detailed in the IEC which pertain to the equipment being tested . Type tests are to prove the general design of the equipment. The manufacturer may submit test certificates of tests which have been carried –out on identical equipment. The inspector after referring to our MOE may accept such certificate in line of the specified type test or to reject them. The type test prescribed shall be carried-out in all cases where such certificates are not available or are rejected The type test shall be carried –out according to the following standards. 1) IEC 60298 2) IEC 60694 3) IEC 60265 4) IEC 60420 5) IEC 60129 6) IEC 60157 Certifies test certificates issued by A.S.T.A or K.E.M.A for type tests carried-out on identical equipment will be accepted in lieu . B- Routine Test The routine test shall be carried –out on each of the following equipment IEC Standards 1- Switch gear: The switch gear shall be subjected to routine tests at the manufactures works according to clause 23, 20, 24, 3 IEC 60298 2- Switch: Each switch shall be subjected to all routine tests under section 2 chapter 5 of IEC 60265, 60129
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
3- Fuse switch: Each switch shall be subjected to all routine tests according to relevant standards 4- Current Transformer: Each switch shall be subjected to all routine tests specified in IEC 60185.
5- L.T switch board: Each switch shall be subjected to all routine tests specified in IEC 60157. 6- Instruments and meters: Instruments and meters shall be subjected to the routine tests specified in IEC 51 as applicable 7- Transformers : Test shall be carried –out at the manufactures work shop and shall comprise type & routine tests as specified in the specification 12. SCHEDULE OF MATERIAL The kiosk type S/S shall consist the following item: 12-1 MV equipment complete with fuses two isolators and one switch fuse complete with bus bar, earth switches indication, short circuit indication and earth fault indication. 12-2 L.T equipment for kiosk 250 KVA are as following: • Main 800 Amp. bus-bar. • Main C.B. 400 A equipped with three ammeters, three 400/5 C.T's class1, voltmeters with selector switch. • Two outgoing feeders 200 Amp. rating each equipped with three ammeters and C.T's class 1, 200/5A. • 4×25 KVAR capacitors with automatic stages IN/OUT operation through var. metric relay with P.F meter, the capacitor banks shall connected to L.T bus bar with suitable protection (cartridge fuse and contactor). • Supply switch for street lighting. • Heater 220 V. • Lighting of Kiosk and 15 Amp. Sockets. • cable gland for outgoing feeders as follows:2 outgoing feeder glands suitable for (4×1×150) mm2 cable each 12-3 L.T equipment for kiosk 400 KVA are as following: • Main 800 Amp. bus-bar. • Main C.B 600Amp. rating equipped with three 600/5 C.T's class 1, voltmeter with selector switch • Two outgoing feeder 400 Amp. Rating equipped with three ammeters and C.T's 400/5 class 1. • 4×50 KVAR capacitors with automatic stages IN/OUT operation through var. metric relay with P.F meter, the capacitor banks shall connected to L.T bus-bar with suitable protection (cartridge fuse and contactor). • Supply switch for steer lighting. • Heater 220 V. • Lighting of Kiosk and 15 Amp. Sockets. • cable gland for outgoing feeders as follows: 2 outgoing feeder glands suitable for two (4×1×150) mm2 cable 12-4 L.T equipment for kiosk 630 KVA are as following: • Main 1200 Amp. bus-bar, • Main C.B 1000 Amp. rating equipped with three 1000/5 C.T's class 1, voltmeter with selector switch. • Three outgoing feeder 400 Amp. Rating equipped with three ammeters and C.T's class 1.
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
• 6x50 KVAR capacitors with automatic stages IN/OUT operation through var. metric relay with P.F meter, the capacitor banks shall connected to L.T bus bar with suitable protection (cartridge fuse and contactor). • Supply switch for street lighting. • Heater 220 V. • Lighting of Kiosk and 15 Amp. Sockets. • cable gland for outgoing feeders as follows:3 outgoing feeder gland suitable for two (4×1×150) mm2 cable.
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Technical Specification of Kiosk type 11/0.4 kV sub-station 250, 400 & 630KVA
Spare parts: Quote units price for the following: Item A. C.B 200 Amp C.B 400 Amp C.B 1000 Amp B. Current transformer class 1, 200 / 5 Ditto 400 / 5 Ditto 400 / 5 Ditto 1000 / 5 C. Ampere meter D. Volt meter E. Var metric relay F. Contractors G. H . R . C fuses (H. T ) H. Fuses ( L . T ) I. Power capacitor
Qty. 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% 10% 5% 10%
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