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Liasoning |
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Substations |
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Erection and commissioning |
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Maintenance |
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Others |
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| OH Transmission Line |
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Urja provides comprehensive design, engineering and management services for transmission line projects, including feasibility studies and site supervision. We use the latest analysis and simulation software to deliver profile optimization and tower design that compiles with international codes. We also possess extensive foundation design capabilities.
Different activities involved in Turnkey Transmission projects are:
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· Site Survey: This includes detailed line survey, longitudinal profiles, route maps, spotting of towers, marking of tower locations, checking of distances between the towers etc.
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· Soil Investigation: This includes mobilization and shifting of all equipment, standard penetration tests, taking samples, delivery and storage of samples, laboratory tests, preparation of geotechnical report etc.
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· Laying of Access roads: Tree cutting for transportation of material and equipments at tower locations.
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· Foundations: Foundation designing depending on the soil properties, form work, concreting, reinforcement, tower earthing, corrosion protection, foundation testing etc.
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· Tower Design: Designing of various types of towers. Preparation of Sag Tension Charts, Tower Loadings, Tower analysis & designing, Optimization of weights etc. Preparation of Structural & Shop Drawings.
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· Tower Testing: Full load / Destruction Testing of each type of tower.
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· Tower Manufacturing: Fabrication and hot dip galvanizing of towers.
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· Mobilization of Manpower & Equipments: Such as excavators, rock drilling machines, Tower erection tools, Mobile cranes, Tension stringing equipments, rollers, pilot wires, vehicles, walkie–talkie sets, etc.
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· Procurement of Transmission Line Material such as :
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o Lattice Steel Towers
§ Suspension, Tension, Transposition Towers
§ Single Circuit, Double circuit, Multi circuit Towers
§ Vertical/ Horizontal Towers
§ Gantries at substation
o Conductor
§ AAC/ AAAC
§ ACSR
§ Insulated (ABC)
o OPGW & OPGW Accessories
o Earthwire
o Insulators
§ Disc Insulators
§ Pin Insulators
§ Longrod Insulators
§ Insulators made up of different materials such as Porcelain, Polymer, etc.
o Insulator Hardware
§ Single / Double Suspension Clamps
§ Single / Double Tension Clamps
§ VSuspension Clamps
o Line Accessories (For Conductor, OPGW, Earthwire)
§ Suspension Clamps
§ Tension Clamps
§ Dead End Clamps
§ Armour Rods
§ Vibration Dampers
§ Spacers / Spacer Dampers
§ Joint Boxes for OPGW
§ Bird guard
o Steel Poles (Polygonal / Circular)
o Lightning Arresters
o Warning Light / Warning Spheres
o Earthing Components
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· Tower Erection using various specialized equipments such as cranes, winches, pulleys, nut bolts, etc. Tightening of nuts & bolts, fixation of phase plates, circuit plates, danger plates, number plates, bird guards, etc.
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· Stringing of Conductor & Earthwire includes fixing of suspension and tension assemblies and insulators on tower cross arms, furnishing, stringing and sagging of conductor, earthwire, OPGW with jumper loops and mid span joints, sag adjustments, fixation of spacers, spacer dampers, vibration dampers, aviation warning devices such as warning spheres etc.
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· Testing and commissioning of transmission line which includes pre commissioning checks, tests and charging of the transmission line.
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