single circuit 400 kV OHL

Single circuit 400KV OHL steel tower

A single-circuit transmission line carries conductors for only one circuit. For a three-phase system, this implies that each tower supports three conductors. In single-circuit towers the conductors are lined up horizontally. Both tubular and lattice steel towers can be designed so as to support single-circuit of electrical current. Single-circuit towers hold the different conductors stacked atop one another, while in single-circuit towers the conductors are lined up horizontally.

MEGATRO mainly produce single circuit 400KV OHL steel tower for our European clients, even some other regions or countries. Main some data as follow:

Nominal voltage: 400 kV

Conductors: ACSR 490/65 mm2

Circuits: Single Circuit (3 phases)

No of conductors: 2 Conductors per phase

Bundle spacing:400 mm

Earthwires: 2 with optical fibres

OPGW 15 mm, with optical cable with 48 monomode fibres (24 ITU-T G.652D and 24 ITU-T G.655C), and stranding part AA/ACS 74/51 mm2

Other data such conductor, OPGW and design data will up to client.

Our main design engineer from USA, can use PLS software to design every type steel tower beased on structural calculations and geometrical frame drawings. To meet the expectation, we produce shop drawings, components list and full production documentation, and even complete 3D models that facilitate the elimination of all design and drawings errors generated on the drawings. Another advantage is our 3D design and loading & design report, and can optimized the design and save cost for our clients.

MEGATRO had professional QA &QC team to control quality and execute strict QC & QC plan as per client requirements. MEGATRO is one of the few manufactures who assemble a face of 110KV overhead transmission line steel tower. After fabrication all 110KV overhead transmission line steel tower are delivered to the galvanizing facility to be Hot DIP Galvanized. Towers are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free towers. Even we take secondary finish for client again, which as duplex surface treatment. The duplex coating applied in our own paint shop.

Fabrication standard: Chinese or other standard:
1. GB/T2694-2003 Transmission line tower - - Technical requirements for manufacturing
2. JGJ81-2002: Technical specification for welding for steel structure of building
3. GB9787-88: Measuring and allowable tolerance for hot-rolled equal angle
4. GB709-88: Measuring and allowable tolerance for hot-rolled plate and strip
5. GB/T699-1999: Quality Carbon Structural Steel
6. GB/T1591-1994: Low alloy high strength structural Steel
7. GB700-88: Carbon Structural Steel
8. GB222-84: Method of sampling steel for determination of chemical composition and permissible variations
9. GB/T228-2002: Method for Tensile testing of metals
10 GB/T232-1999: Method for Bending test of metals
11 GB/T5117-1995: Carbon Welding Rod
12 GB/T5118-1995: Low Alloy Welding Rod
13 GB/T8110-1995: Welding wires for gas shielding arc welding of carbon and low alloy steels
14 GB/T10045-2001: Carbon steel flux cored electrodes for arc welding
15 JB/T7949-1999: Weld outer dimensions for steel construction
16 GB50205-2001: Test Standard for Acceptance of Steel Structure
17 GB/T470-1997: Zinc Ingot
18 GB3098.1-2000: Mechanical properties of fasteners-Part 1: Bolts, screws and studs
19 GB3098.2-2000: Mechanical properties of fasteners-Part2: Nuts, and thread
20 GB3098.3-2000: Mechanical properties of fasteners-Part3: Fastening screw
21 GB/T5780-2000: Helical Bolts Grade C
22 GB/T41-2000: Helical Nuts Grade C
23 GB/T90-2002: Flat Washer Grade C
24 GB/T13912-2002: Metal Coating, Technical Requirement