All routine tests as per applicable standard shall be carried out in presence of engineer form owner or their representative without any extra charges.
a. Check to ensure that the joints are as per specification.
b. Check that there are no cuts etc. on the strands.
c. Check that drums are as per specification.
d. All acceptance tests mentioned as above shall be carried out on each coil and the record of the same shall be kept by the supplier and same shall be produced at the time of inspection.
e. Resistance Test
TYPE TESTS:
The following Type Tests shall be conducted a. Test for surface condition
b. Test for ultimate breaking load on stranded conductor.
If vendor can furnished the Type Test certificate for test conducted not 5 years before date of supply, the type test can be waived off. Any failure of submission of certificate or certificates older than 5 yrs., vendor need to perform the test without extra cost and time.
8.0.0 LIGHTNING ARRESTOR:
8.0.1 INTENT:
8.0.1.1 The intent of this Section is to provide the information for the 30 kV Lightning Arrester .The design, manufacture, testing and performance of all equipment shall comply in all respects with the requirements of the latest edition of the applicable standards and codes.
8.0.2 SCOPE:
8.0.2.1 The following is the scope of Supply, of the following :
a. 30 kV Lightning Arrestors including mounting Structures 06 Nos.
b. Clamps, and Connectors 1 Lot.
8.0.2.2 The work shall be carried out in accordance with drawings, specifications and data sheets enclosed with this document.
8.0.3 GENERAL REQUIREMENTS :
8.0.3.1 The LA's shall be supplied with insulating base to monitor the discharge currents.
8.0.3.2 Each LA shall be supplied with one discharge counter and leakage current indicator.
8.0.3.3 The discharge counter shall be provided with M12 tin plated brass studs with two nuts, brass washers & spring washer for connections to Purchaser’s earth grid. Suitably rated bypass shunt for bypassing the discharge counter shall also be provided.
8.0.3.4 The discharge counter shall be suitable for outdoor installation with IP55 protection.
8.0.3.5 The insulated flexible connector required for connecting LA to the discharge counter is in the scope of the bidder.
8.0.3.6 The flexible connectors shall be of adequate length with margin.
8.0.3.7 The LA will be connected to ACSR conductor. The terminals shall be suitable for vertical takeoff and clamps and connectors shall be indicated in Data sheet.
8.0.3.8 The materials and components not specifically stated in this specification but which are necessary for satisfactory operation of the equipment are deemed to be included in the scope of supply unless specifically excluded.
8.0.4 CONSTRUCTIONAL FEATURES:
8.0.4.1 Lightning arrestors shall be of the hermetically sealed type of self-supporting Construction, suitable for mounting on the steel structures.
8.0.4.2 They shall have adequate thermal discharge capacity for severe switching surges, long duration surges and multiple strokes. The lightning arrestors when provided with pressure relief devices shall be capable of withstanding the internal pressures developed during the above discharges without operation of the pressure relief devices..
8.0.4.3 Spacers for gaps and valve elements or valve blocks shall be of ceramic material. These shall be provided in such a way as to obtain robust construction, with excellent mechanical and electrical properties.
8.0.4.4 Outer insulators shall be of porcelain having adequate mechanical strength and rigidity, for satisfactory operation under climatic conditions obtaining at Site. Porcelain shall be finely glazed and shall be free from imperfections.
8.0.4.5 Arrestors shall be designed to withstand seismic acceleration and wind pressure as specified.
8.0.4.6 Arrestors shall incorporate anti-contamination feature to prevent arrestor failure, consequent to uneven voltage gradient across the stack in the event of contamination of the arrestor porcelain. These features shall be described in detail when submitting the Bid.
8.0.4.7 Arrestors shall be suitable for hot line washing.
8.0.4.8 All metal parts shall be of non-rusting and non-corroding metal. Bolts, screws and pins shall be provided with lock washers, keys or equivalent locking facilities. All similar parts, particularly removable ones, shall be interchangeable.
8.0.4.9 Arrestors shall be capable of spark over on frequent switching surges.
8.0.4.10 Arrestors shall be capable of discharging over-voltages occurring during switching of unloaded transformers, capacitor banks and long lines.
8.0.5 ACCESSORIES :
8.0.5.1
SUPPORTING ARRANGEMENT:
8.0.5.1.1 Arrestors shall be complete with insulating boxes having provision for bolting to flat surface of supporting structure. Steel Supporting structure is part of the scope of supply of the VENDOR. The VENDOR shall furnish detailed dimensional drawings indicating all fixing details and electrical clearance diagram for installation.
8.0.6
DISCHARGE COUNTER:
8.0.6.1 Self-contained discharge counter, suitably enclosed for outdoor use and requiring no auxiliary or battery supply shall be provided for each single pole unit.
8.0.6.2 The discharge counter shall be visible through an inspection window.
8.0.6.3 The counter terminals shall be robust and shall be so located that incoming and outgoing connections are made with minimum possible bends.
8.0.6.4 Suitably sized bypass shunts of copper to facilitate bypassing the discharge counter shall be furnished. The design of the terminal connectors shall permit the connection of these shunts.
8.0.6.5 The connecting conductor from lightning arrestor earth terminal to the discharge counter incoming terminal shall be insulated for a minimum of 4 kV and this insulated conductor shall be supplied along with the arrestor by the VENDOR. This insulating conductor shall be of the type which does not require sealing ends or plumbed joints at its either end for terminations.
8.0.6.6 A leakage current detector as an integral part of the discharge counter shall be supplied.
The counter along with the detector shall be so arranged that it will be possible to read the leakage current values from ground level. The value of leakage current beyond which the operation is abnormal shall be clearly marked in red colour on the detector.
8.0.7 GRADING RINGS :
8.0.7.1 Grading rings shall be provided on each complete arrestor unit for proper stress distribution as dictated by the voltage class of the arrestor.
8.0.8 TERMINALS :
8.0.8.1 Arrestor shall be complete with line and earth terminals. The terminal clamps/connectors on the earth terminal of the arrestors and the discharge counter incoming and outgoing terminals shall be within the scope of the VENDOR.
8.0.9 NAME PLATES :
8.0.9.1 Each lightning arrestor shall be provided with non-rusting and non-corroding name plate bearing Arrestor Identification as per applicable standards.
8.0.10
PAINTING:
8.0.10.1.1 The external finish paint shade for the LA, mounting structure, mechanism box and its accessories if any shall be Shade 631 of IS 5.
8.0.10.2 The type of paint shall be synthetic enamel air-dried.
8.0.10.3 The interior of the Control Panel / Marshaling box shall be painted with glossy white enamel paint.
8.0.10.4 All metallic parts shall have rust protection.
8.0.10.5 All steel surfaces shall be thoroughly cleaned by sand blasting or chemical agents as required, to produce a smooth surface free of scales, grease and rust.
8.0.10.6 The external surfaces, after cleaning, shall be given a coat of high quality red oxide or yellow chromate primer followed by filler coats.
8.0.10.7 Sufficient quantity of touch up paint shall be furnished for application after installation at site.
8.0.10.8 All supporting structures and hardware shall be hot dip galvanized.
8.0.11 DOCUMENTATION
:8.0.11.1 Bidder shall submit the following documents for equipment with the offer.
a. Datasheet b. Specifications c. Catalogue
d. GA drawings & Installation Drawings
e. QAP
f. Test Certificates
g. Support Structure drawing
h. Discharge counter details drawing i. Packing list
j. Deviation list
8.0.11.2 Vendor shall submit the following documents for all equipment after award of job for approvals:
a. Datasheet
b. Overall general arrangement drawings giving plan, section, foundation loading data (both static and dynamic), side view, etc in cad drawings
c. Control and schematic diagrams with ferrule and terminal numbers.
d. Catalogue of the Equipment
e. General outline drawings showing dimensions, net and shipping weights, quantity etc.
f. Internal component layout drawings.
g. Sectional views showing the general constructional features of the circuit breaker including operating mechanism, arcing chambers, contacts, Vacuum bottle, with bushing lifting dimensions.
h. General arrangement of the foundations or structure mountings in CAD.
i. Instruction and Training Manual j. Packing drawings and Packing list k. Equipment Storage
l. QAP