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Power Grid Company of Bangladesh Limited POWER GRID COMPANY OF BANGLADESH LIMITED BIDDING DOCUMENT FOR Design, Supply, Erection, Testing & Commissioning of renovation for two 230kV bays at existing Haripur 230/132kV Substation and necessary works for two 230kV bays at existing Siddhirganj 230/132kV Substation on Turnkey Basis (Contract No. PGCB/230KV/SS/S-H) VOLUME 2 OF 3 SCOPE OF WORK TECHNICAL SPECIFICATIONS DRAWING FORMING PART OF SPECIFICATION April 2016 POWER GRID COMPANY OF BANGLADESH LIMITED Bidding Document For the Procurement of Design, Supply, Erection, Testing & Commissioning of renovation for two 230kV bays at existing Haripur 230/132kV Substation and necessary works for two 230kV bays at existing Siddhirganj 230/132kV Substation on Turnkey Basis (Contract No. PGCB/230KV/SS/S-H) INDEX TO VOLUMES Volume 1 of 3 Section 1 - Instruction to Bidders Section 2 - Bid Data Sheet Section 3 - Evaluation and Qualification Criteria Section 4 - Bid Forms Section 5 - Eligible Countries Section 6 - Employer’s Requirements Section 7 - General Conditions of Contract Section 8 - Special Conditions of Contract Section 9 - Contract Forms Volume 2 of 3 Scope of Work Technical Specifications Drawings forming Part of Specifications Volume 3 of 3 Bid Forms Schedule A Introduction & Preamble to the Price & Technical Schedules Schedule B Bid Prices Schedule C Bar Chart Programme of Key Activities Schedule D Manufacturers, Places of Manufacture and Testing Schedule E Technical Particulars and Guarantees Schedule F Proposed Subcontractors POWER GRID COMPANY OF BANGLADESH LIMITED BIDDING DOCUMENT FOR Design, Supply, Erection, Testing & Commissioning of renovation for two 230kV bays at existing Haripur 230/132kV Substation and necessary works for two 230kV bays at existing Siddhirganj 230/132kV Substation on Turnkey Basis (Contract No. PGCB/230KV/SS/S-H) SECTION 1 SCOPE OF WORK Sec-1: Scope of Work 1/1 SECTION 1 SCOPE OF WORK 1.1 DESCRIPTION OF THIS BID The work covered by this Bid and Specification is outlined below, for 230 kV rated voltage outdoor type Air Insulated Switchgear (AIS) substation plant and civil works. This Bidding Document is for the design, manufacture, quality assurance, new packing for export, insurance and shipment to site, complete construction and installation, jointing, terminating, bonding, earthing, painting, setting to work, site testing and commissioning, warranty for a period of 365 days for all equipment, including all civil works. The detailed requirements are listed in Schedule-A, Schedule of Requirements of volume 3 of 3 of this biding document. The Contractor is responsible for ensuring that all and any items of work required for the safe, efficient and satisfactory completion and functioning of the works, are included in the Bid price whether they be described in the specification or not. 1.2 DESCRIPTION OF THIS PROJECT The Works under this Bid Package for substation part in brief are: Renovation of two 230kV bays at existing Haripur 230/132kV substation with switchgear equipment, necessary modification of existing Control & Protection panel including supply two differential relay (one differential relay and other one differential relay with distance protection) , replacement of existing 145kV busbar protection system by new 145kV busbar protection system , extension of fiber optic multiplexer & tele-protection equipment and integration of two 230 kV bays with existing NLDC system and associated equipment with all related civil works including earthing, lightning protection. The bays shall be used for connecting 230kV Shiddhirganj -1 &-2 transmission line. Supply, installation, testing and commissioning of associated line protection equipment (two differential relay) in existing protection panel including integration with existing control, metering and substation automation system for Haripur Line-1 & 2 at Shiddhirgonj Substation and necessary wiring in existing DFDR,extension of fiber optic multiplexer & tele-protection equipment and integration of two bays with existing NLDC system .The bays shall be used for connecting 230kV Haripur-1 &-2 transmission line. The “Schedule of Requirements” for equipment, materials and services and the Detailed Technical Specifications of equipment and materials as included in Volume 3 of 3 of the Bidding Document shall be read in conjunction with the scope of work described herein. The drawings provided in the bidding documents are indicative only and hence the entire scope of work is not fully reflected in those drawings. The programme of works shall be as shown in schedule C of times for delivery and completion. Within one month of acceptance of the Bid, the contractor shall submit a programme chart detailing times required for the design, manufacture, testing, delivery and erection for the complete work. Sec-1: Scope of Work 1/2 This Bid provides for all parts of the works to be completed in every respect for commercial operation to the requirements of the Engineer. All details, accessories etc. required for the complete installation and satisfactory operation of the works not specifically mentioned in this Specification are deemed to be included in the contract price. 2 TERMINAL POINTS 2.1 132 kV Overhead Line Circuit Connections The slack spans including overhead earth wires between the 132kV overhead line terminal towers and the substation gantry structures shall be supplied and terminated by the overhead line contractors. All required insulators and hardwires shall also be supplied by the overhead line contractors. Eyebolts or other suitable fixtures for terminating the slack spans on the switchyard gantry shall be provided on the substation Contract. The overhead line Contractor shall provide a jumper from the slack span of sufficient length to terminate on the substation entry equipment. The supply of appropriate clamps and the actual termination of the jumper to the substation equipment shall be carried out under this Contract. Bonding of the incoming earth wire to the station earthing screen and supply of earthing conductor and connection of the terminal tower earth electrode into the substation earth grid shall be carried out under this Contract. The overhead line Contractor shall terminate the OPGW at the substation gantry in the terminal joint boxes provided by the line Contractors. The connection between OPGW joint boxes at S/S gantry and control room building via optical fibre cables shall be carried out under this Contract which include supply & installation of fibre optic cable of size similar to OPGW 1.3.2 Communications and SCADA Equipment The voice communication, teleprotection signalling and main distribution frame (MDF) for optical fibre cable will be supplied and installed under this Contract for 230kV system. Necessary equipment for incorporating new & existing equipment of 230kV system into the existing SCADA system shall also be supplied and installed under this Contract In order to provide the telecontrol & telemetering facilities required at the existing National Load Despatch Center(NLDC) at Rampura, Dhaka; all plant supplied under this Contract shall be equipped with potential free auxiliary contacts for indications and alarms. CT and VT circuits shall be fitted, where required, with the appropriate shorting and fused terminals. All required electrical signals shall be transmitted to the NLDC through the Industrial Gateway of the substation automation system or Remote Terminal Unit (RTU). All HV breakers, motorized disconnectors, tap changer, etc. shall be controlled form NLDC through the Gateway of the substation automation system or RTU using IEC 60870-5-101/104 protocol. Necessary transducer, control & interposing relays, RTU’s, etc. shall be used. Necessary interfacing between the Substation Automation gateway and the communication equipment is to be carried out. In addition, to realize the complete SCADA system after completion of the Project, modification of the existing software in the master computer of the national control center, and modification of hardware (installing additional printed circuit cards etc. if required) shall be made under this Contract. Sec-1: Scope of Work 1/3 1.4 SYSTEM ELECTRICAL PARAMETERS 1.4.1 System Conditions Equipment supplied under this Contract shall be suitable for the following system conditions. Nominal system voltage between phases kV 230 System frequency Hz ----------50---------- Rated voltage between phases kV 245 Lightning impulse withstand kV 1050 50 Hz withstand 1 minute kV 460 Symmetrical short-circuit current (1 sec) kA 63 1.4.2 System Earthing The 230/132 kV auto transformers shall be solidly earthed. The 132 kV system is solidly earthed at the power station transformer 132 kV neutrals and 230/132 kV autotransformer neutrals but not earthed at the 132/33 kV Grid supply points. 1.4.3 Minimum Substation Clearances Air insulated busbars and connections shall have electrical clearances as listed in the following table:- Nominal system voltage kV 230 Minimum clearance between live metal mm 2100 and earth Minimum clearance between live metal mm 2400 Minimum safety clearance between ground and the nearest point not at earth potential of an insulator mm 2500 Minimum safety clearance between ground and the nearest live unscreened conductor (BS 7354 'Safety Working Clearance') mm 4270 Minimum insulator creepage distance (at rated voltage between phases) mm/kV 25 1.4.4 Low Voltage AC System Rated service voltage 400/230 volts (3 phase, 4 wire 50 Hz) Tolerance on rated voltage +15%,-15% Switchgear symmetrical breaking capacity 15 kA, 3 sec
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