Mechanical Testing and Evaluation of Braced Line Post Assemblies - PowerPoint PPT Presentation

Mechanical Testing and Evaluation of Braced Line Post Assemblies Composed of Non-Ceramic Insulators R. A. Bernstorf Hubbell Power Systems SEPTEMBER 5 - 7, 2018

Braced Line Post Family SEPTEMBER 5 - 7, 2018

Calculation Template SEPTEMBER 5 - 7, 2018

Buckling Loads and Equations • ΣFx = P c *cos(α) – S T *cos(β) = 0 • ΣFy = P c *sin(α) + S T *sin(β) – V = 0 • Pivoting Horizontal V: – Buckling Load = π 2 *E*I/(1.03*L 2 ) • Fixed Base Horizontal V: – Buckling Load = π 2 *E*I/(1.02*L 2 ) • Braced Line Post: – Buckling Load = π 2 *E*I/(1.33*L 2 ) SEPTEMBER 5 - 7, 2018

SEPTEMBER 5 - 7, 2018

SEPTEMBER 5 - 7, 2018

SEPTEMBER 5 - 7, 2018

Braced Line Post - 230 kV 14 L = 98.5 inches α = 12⁰ 12 β = 50⁰ 10 Longitudinal Deflection (in) 8 6 4 2 0 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 20000 Vertical Load (lb) SEPTEMBER 5 - 7, 2018

230 kV Braced Line Post - Fixed Point Loading 2 L = 98.5 inches α = 12° 1.8 β = 50 ° 1.6 1.4 1.2 Deflection (in) 1 0.8 0.6 0.4 0.2 0 0 2000 4000 6000 8000 10000 12000 Applied Vertical Load (lb) SEPTEMBER 5 - 7, 2018

250 Braced Line Post - 345 kV 30 25 Longitudinal Deflection (in.) 20 15 250 Loading 10 5 0 0 2000 4000 6000 8000 10000 12000 14000 Vertical Load (lb) SEPTEMBER 5 - 7, 2018

345 kV Braced Line Post - Fixed Point Loading 1.4 L = 110 inches α = 12 ° 1.2 β = 44 ° 1 Longitudinal Deflection (in) 0.8 0.6 0.4 0.2 0 0 2000 4000 6000 8000 10000 12000 14000 16000 18000 Applied Vertical Load (lb) SEPTEMBER 5 - 7, 2018

Series 300 BLP - 345 kV 3.5 3 Longitudinal Deflection (in.) 2.5 2 Series 300 BLP 1.5 1 0.5 0 0 5000 10000 15000 20000 Vertical Load (lb) SEPTEMBER 5 - 7, 2018

SEPTEMBER 5 - 7, 2018

Conclusions • There are no standards regarding BLP testing. • Fixed point loading offers very high buckling strength. • Free weight loading offers lower buckling strength. • In the absence of standards, Utilities must assess their own requirements. SEPTEMBER 5 - 7, 2018