D.C. DISTRIBUTION BOARD

Transcription

1 PRAMBL: The TC is maintaining 50-volt battery backup system for the PLCC communication. The 50-volt D.C. supply from the Float cum Boost charger is brought to D.C. Distribution Board from where supply is catered to various carrier terminals, Communication equipments etc. CNSTRUCTIN: The cubicle shall be constructed from good quality steel sheet. The cubicle shall be robust in construction. The cubicle shall be made of steel sheet of not less than 1.6 mm. It will be reinforced by steel frame and shall be mechanically strong. It will be indoor, floor mounting and naturally air-cooled type designed for continuous operation in an ambient temperature of 50ºC. Necessary phosphating treatment shall be given to the cubicle and shall be painted with two coats of red oxide primer followed by a coat of gray synthetic enamel paint, SH No. 631, IS: 05 on external side and on internal side with glossy white colour. The cubicle shall have minimum Hight x Breadth x Width 1600mm x 800mm x 400mm spacious so that all the components shall be approachable easily and replaceable after opening the door. It will be provided with door handle and handle lock with key but not Alen key. It should be possible to erect the cubicle side by side. The replacement of the components and testing should be possible from front and backside of cubicle. The removable side covers shall be provided, but it should not be necessary to open the side covers for replacement of spare parts and testing purpose. The cubicle shall be mounted on C Type channel with opening for cable entry on rear side. The cubicle shall be designed (As per fig-a) to receive eight single core 50 mm 2 incoming copper cables (i.e 4 pairs of cable, each pair shall have one +Ve cable & one Ve cable) (outside dia. 14 mm to 20 mm. approx.). Two pairs of cable, each one shall be used as Main cables (+Ve & -Ve) and as standby (+Ve & - Ve) for D.C bus 1 and another remaining Two pairs of cable shall be used as Main cables (+Ve & -Ve) and as standby (+Ve & -Ve) for D.C bus 2 of two bus arrangement system of DB (w/o any physical interconnection between them). ach bus having one +Ve & one Ve bus should have to catered load to 10Nos. of outgoing feeders. The punched holes shall be provided for above cable entries. The dimensional drawing of the cubicle with all mountings shall be furnished by the bidder. Necessary cable glands shall be supplied with the DB. (i) There will be 10 Nos. D.C. outlets each rated for 6 Amp will be connected on each D.C Bus of two bus arrangement systems. ach 6 Amp. D.C. outlet shall be controlled by HRC fuse of nglish lectric/s&s/c&s make. The fuse base and links shall be easily replaceable. The cable gland shall be provided at bottom for taking output of each 2.5 mm 2, Two Core Cable (+ve and -ve line). The Company shall provide the wiring from output of HRC Fuse. The LD-indicating lamp shall be provided for indicating healthiness of HRC Fuse of each outgoing feeder on the front panel of cubical. TC//TS-DB 03302/R0, Dt: Page 1 of 7

2 There will be two Main copper bus bars, with +Ve & -Ve connecting terminals each of electrolytic copper confirming IS 8130/84, which will be liberally rated. It will receive D.C. input from incoming cables Main and Stand by for each BUS of two bus arrangement system, through HRC fuse of 63 A, nglish lectric/s&s/c&s make for each +Ve and Ve line of D.C Supply for both Main and Stand by cables. The input to HRC fuse of each outgoing feeder shall be extended from +Ve D.C and Ve D.C bus of auxiliary Bus bar BUS 1 & BUS 2 of two bus arrangement system. The thickness and width of Main and Auxiliary bus bar shall not be less than 5 mm and 30 mm respectively. The bus bar shall be of sufficient length to avoid congestion. The separation between connection points of +Ve lines of cable of two successive outgoing feeders on D.C +Ve Bus and Ve lines of cable of two successive outgoing feeders on D.C Ve Bus shall be 4 Cms. Bus bar shall be insulated to avoid accident while working inside D.C.D.B. Insulation on the bus bar may reduce the rate of dissipation of heat generated in bus bar. This will increase temperature of busbar, which will affect the insulation. Therefore bus bar design should take all these factors into account so that there is no temperature rise. ach HRC Fuse shall be connected to auxiliary bus bar by using insulated copper cable of not less than 6 mm 2. The design of DB shall be such that there shall be minimum voltage drop. Special care shall be taken to avoid voltage drop at every level. The wiring shall be neat and clean without any congestion and shall be supported mechanically as well as tied up to withstand transit vibrations. More than two wires shall not be terminated at a point. Terminal blocks shall be used for terminating more than one wire. D.C. Voltmeter make Meco/A to read D.C. voltage upto 75 V and D.C. Ampere meter make Meco/A with 0-60A capacity shall be provided for each bus of two BUS arrangement systems. The meters and shunts shall be of good quality suitable to give a long and satisfactory service. An indicating main LD shall be provided for each incoming D.C input to be terminated on main D.C bus each after 63Amp HRC fuse, to get connected with BUS1 & BUS2 of two bus arrangement system on the front panel of the DB. The healthy condition of HRC Fuse shall be indicated on front by a glowing red LD on front door with door in closed position. A cubicle light with fuse and switch shall be provided inside the cubicle operating on D.C. RQUIRMNTS: The D.C.D.B. shall be scientifically designed to avoid temperature rise and voltage drop. The vermin proofing shall be given due importance and it will be carried out positively. All labels shall be revetted. Stickers shall not be accepted. Proper earthing arrangements shall be provided on the cubicle. TC//TS-DB 03302/R0, Dt: Page 2 of 7

3 SCP F SUPPLY: D.C. DISTRIBUTIN BARD 1. Design, fabricate and supply 50 volts D.C. Distribution Board with two bus arrangement systems with each bus shall have 60 Amp. Capacity and 10 outlets of 6 Amp. each Nos. of Cable glands for 50 mm 2 Incoming Main and Stand by cables (4 cables per each bus i.e. 2cables (+Ve & -Ve) for Main & other 2 for stand by), 20 Nos. of glands for 2.5 mm 2, 2 Core X 20 cables of utgoing feeders (10Nos. of feeder per each bus) and 8 Nos. of 50mm 2 copper lugs for incoming cables shall be in the scope of the supplier. PRQUALIFICATIN RQUIRMNTS FR BIDDR: 1. The bidder shall be riginal quipment Manufacturer of the DB offered. The offered equipments should have been designed, manufactured and tested as per relevant IS/IC Standards with latest amendments. 2. The bidder should indicate manufacturing capacity by submitting fresh certificate of a Chartered ngineer (C). 3. The bidder should clearly indicate the quantity and single value contract executed during last FIV (5) years, for the offered equipment. The details of past supplies should cover, i) Same rated equipment as ffered supplied to TC (rstwhile known as B). ii) Higher rated equipment than ffered supplied to TC (rstwhile iii) known as B). Same rated equipment as ffered supplied to other Utilities with Performance certificate if any. 4. The bidder shall provide detailed A Drawing and lectrical Diagram indicating all fuses and bus bars etc. with the size and rating. The offer shall not be considered without the drawing. SPCIAL INSTRUCTIN T BIDDR 1. The bidder shall submit Quality Assurance Plan for manufacturing process with the technical bid. 2. The bidder shall clearly indicate deviations, if, any only at the specified annexure. 3. Please note that the evaluation will be carried out on the strength of content of bid only. No further correspondence will be made. 4. The bidder shall give the bill of materials including the make of the components used. 5. The bidder shall give the detailed list of the orders executed for supply of similar equipment. TC//TS-DB 03302/R0, Dt: Page 3 of 7

4 6. The bidder shall have minimum five years of experience in manufacture & supply of such electrical cubicles. 7. The bidder shall furnish the Technical details of the DB offered in uaranteed technical particulars enclosed with the specification. 8. The supplier shall have to get the Prototype model of D.C.D.B approved From Addl.Chief ngr. (Telecom & Testing),..T.C.., C., Vadodara prior to manufacturing bulk Quantity. 9. The TC reserves right either to increase or decrease the quantity at the Time of placing the order. 10.The TC reserve right either to accept or reject any of the offers without Assigning the reason. TC//TS-DB 03302/R0, Dt: Page 4 of 7

5 UARANTD TCHNICAL PARTICULARS (To be furnished by the bidder) Sr. Description No. 1. Name and Address of Manufacturer 2. Size of main busbar 3. Size of auxiliary busbar 4. Voltmeter Type Range Make 5. Ammeter Type Range Make 6. I/P Indication 7. /P Indications (For healthiness of HRC Fuse of each utgoing feeder) 8. Insulation resistance Between -ve and +ve 9. Insulation resistance Between +ve and earth 10. Voltage drop between incoming & outgoing terminals at rated capacity 11. Dimensions Height Width Depth Details TC//TS-DB 03302/R0, Dt: Page 5 of 7

6 SCHDUL F RQUIRMNT Sr. No. Description Quantity Volt DB with 20 Feeders TC//TS-DB 03302/R0, Dt: Page 6 of 7

7 FI - A Voltmeter 0 75V & Ampere meter 0 60 to be provided for Aux. BUS 1 Auxiliary BUS 1 U T I N F D R S U T I N F D R S Voltmeter 0 75V & Ampere meter 0 60 to be provided for Aux. BUS 2 Auxiliary BUS 2 Main Bus 1 Main Bus 2 63A HRC Fuse 63A HRC Fuse +Ve +Ve -Ve I/P (Main) I/P (Stand by) -Ve I/P (Main) I/P (Stand by) TC//TS-DB 03302/R0, Dt: Page 7 of 7