Site Conditions for a 71 m 500 kV Tangent Tower: Wind, Ice, Span and Ground

SOLARTODO LIMITED | POWER TOWER | SITE CONDITIONS Site Conditions for a 71 m 500 kV Tangent Tower: Wind, Ice, Span and Ground A 500 kV line moves bulk power — the reference page cites typical corridors of 1,000-1,500 MW — so a weak assumption at one tower can affect an entire grid region. SOLARTODO LIMITED's 71 m heavy lattice tangent tower is designed for 500 kV single-circuit lines with a 497 m design span. EN-PT-C18 | flanged Q420 lattice | tangent (suspension) only What an EPC team should confirm before adopting the tower unchanged.

01 THE STRUCTURE 71 m heavy galvanized lattice tangent tower Carries a 500 kV line across open plains. Heavy galvanized Q420 steel lattice, about 54 t, flanged connections. Electrical: 4 bundled ACSR conductors per phase and 12 composite suspension insulator strings. Design life is 50 years with inspection and coating maintenance. Foundation is about 62 m3 of concrete per tower. This is a tangent (suspension) structure for straight sections, not an angle point. SOLARTODO LIMITED | 71 m 500 kV tangent tower | 2/6

02 DESIGN BASIS Height 71 m, heavy galvanized Q420 steel lattice (about 54 t), flanged. Electrical 500 kV single circuit, 4 bundled ACSR conductors per phase, 12 composite suspension insulator strings. Span 497 m design span. About 12-18% fewer towers than shorter-span layouts, with tighter sag, clearance and conductor-temperature checks (IEEE 738). Loading Class B wind and 15 mm ice, aligned with IEC 60826 / GB 50545. Grounding Below 10 ohm standard; below 4 ohm at high-lightning sites. Foundation About 62 m3 concrete per tower. Rocky or soft ground changes the foundation type. Design life 50 years with inspection and coating maintenance. Supply: installed, commissioned, 1-year warranty. SOLARTODO LIMITED | 71 m 500 kV tangent tower | 3/6

03 DESIGN-BASIS TABLE Confirm these figures against the corridor Span, wind and ice, grounding and foundation are a design basis, not a substitute for a site-specific study. Mountain passes, coastal plains and cold plateaus need local meteorological data before the tower is accepted unchanged. SOLARTODO LIMITED | 71 m 500 kV tangent tower | 4/6

04 FOUR SITE CONDITIONS Wind and ice Span length The Class B / 15 mm ice basis suits many inland corridors. Mountain passes, coastal plains and cold plateaus need local meteorological data before the tower is accepted unchanged. The 497 m span reduces tower count by about 12-18% versus shorter-span layouts, but it raises the importance of sag, clearance and conductor temperature checks (IEEE 738). Lightning exposure Ground and access Where ground flash density is high, the grounding target tightens from 10 ohm to 4 ohm, which may mean extra counterpoise or deeper rods. 62 m3 of concrete per tower and 54 t of steel require an access plan for every location. Rocky or soft ground changes the foundation type. SOLARTODO LIMITED | 71 m 500 kV tangent tower | 5/6

05 FAQ AND WHERE TO READ THE SPEC FAQ Which codes are referenced? IEC 60826, GB 50545, ASCE 10-15, IEEE 738 and ISO 1461 for galvanizing. Suitable for angle points? No. It is a tangent (suspension) structure for straight sections. What does supply include? Installed, commissioned, and a 1-year warranty. Product page https://solartodo.com/products/power-tower/power-tower-71m-500kv-heavy-lattice-tangent-tower-flanged-2026-07-12 Enquiries: WhatsApp +1 737 395 2103. SOLARTODO LIMITED, No.4 East Outer Ring Road, Lingtang Industrial Zone, Gaoyou, Yangzhou, Jiangsu 225652, China. Founded 2014. ISO 9001:2015, ISO 14001:2015, ISO 45001:2018. https://solartodo.com SOLARTODO LIMITED | 71 m 500 kV tangent tower | 6/6

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