Sag & Tension Tool
Interactive sag and tension results for the selected line and load cases.
Line & Span Inputs
Class A: higher norm ice on bare conductors. Class B: lower norm ice on bare conductors. Overhead insulated: fixed 20 N/m norm ice; use overall diameter including insulation for wind and ice sleeve.
Selected line parameters
Line: 910 mm² Al59
Area: 910 mm²
Dead weight: 2.52 kg/m
Diameter: 39.2 mm
Ei: 53000 MPa
Ep: 60000 MPa
SigmaE: 100 MPa
C: 140
epsC: 0.4
alfa: 23
Vertex Point Inputs
Actual span geometry for vertex point calculation. Height difference is positive when the far attachment is higher.
Load Case Presets
Presets are locked. Only the user-defined load case can be edited.
| Case | Temp [°C] | Wind factor | Ice | Creep |
|---|---|---|---|---|
User-defined load case User-specified temperature, wind factor, ice flag, and creep flag. | ||||
Load case H Bare conductor, no wind, minimum temperature, initial stage before creep. | -40.0 | 0 | No | Before |
Load case D Bare conductor, normal wind, minimum temperature at wind, initial stage before creep. | -20.0 | 1 | No | Before |
Load case E Bare conductor, 30% of normal wind, +15°C, initial stage before creep. | 15.0 | 0.3 | No | Before |
Load case 1a High wind factor, bare conductor, before creep. | 0.0 | 1.6 | No | Before |
Load case 3, A Combined wind and ice load; also matches clearance load case A (0°C, ice at normal wind, before creep). | 0.0 | 1 | Yes | Before |
Load case 2a Uniform ice load at no wind, before creep. | 0.0 | 0 | Yes | Before |
0°C still air (initial LC) 0°C, no wind, no ice, before creep. | 0.0 | 0 | No | Before |
0°C still air (T.O.) 0°C, no wind, no ice, after creep. | 0.0 | 0 | No | After |
Load case 2a Uniform ice load at no wind, after creep (final stage). | 0.0 | 0 | Yes | After |
Load case 3, B Combined wind and ice load; also matches clearance load case B (0°C, ice at normal wind, after creep). | 0.0 | 1 | Yes | After |
Load case 1a High wind factor, bare conductor, after creep. | 0.0 | 1.6 | No | After |
Load case G Bare conductor, no wind, +15°C, final stage after creep. | 15.0 | 0 | No | After |
Load case F Bare conductor, 30% of normal wind, +15°C, final stage after creep. | 15.0 | 0.3 | No | After |
Load case C Bare conductor, normal wind, +15°C, final stage after creep. | 15.0 | 1 | No | After |
Maximum temperature Maximum conductor temperature for the relevant service condition. | 50.0 | 0 | No | After |
Short-circuit temperature margin Temperature margin related to short-circuit conditions. | 150.0 | 0 | No | After |
Temperature at short-circuit conditions Temperature at short-circuit conditions (max conductor temperature during short circuit). | 200.0 | 0 | No | After |
Results
Highest tension: amber tint. A-distance (0°C still air, after creep): blue tint (case 8). Line swing uses midspan sag (see Sag column) and wind/weight loads: horizontal offset bn·Fh/Fv, angle from vertical atan2(horizontal, sag).
| Case | Temp [°C] | Tension [MPa] | Tension [kN] | Sag [m] | Line swing angle [°] | Horizontal proj. [m] | Wind load [N/m] | Ice load [N/m] | Template (Mallnr.) | Vertex x [m] | Vertex y [m] |
|---|---|---|---|---|---|---|---|---|---|---|---|
User-defined load case User-defined | 0.0 | 45.000 | 40.95 | 8.225 | 0.00 | 0.000 | 0.00 | 0.00 | 302.1 | 150.00 | 6.792 |
Load case H Min temp, no wind, before creep | -40.0 | 58.314 | 53.07 | 6.345 | 0.00 | 0.000 | 0.00 | 0.00 | 233.0 | 150.00 | 5.241 |
Load case D Min temp at wind, before creep | -20.0 | 53.494 | 48.68 | 6.918 | 21.62 | 2.742 | 9.80 | 0.00 | 254.1 | 150.00 | 5.713 |
Load case E +15°C, 30% wind, before creep | 15.0 | 41.849 | 38.08 | 8.845 | 6.78 | 1.052 | 2.94 | 0.00 | 324.9 | 150.00 | 7.303 |
Load case 1a 0°C, bare, before creep | 0.0 | 52.775 | 48.02 | 7.013 | 35.21 | 4.949 | 17.44 | 0.00 | 257.6 | 150.00 | 5.791 |
Load case 3, A 0°C, ice+normal wind, before creep | 0.0 | 85.700 | 77.99 | 9.408 | 19.25 | 3.285 | 18.80 | 29.11 | 345.6 | 150.00 | 3.566 |
Load case 2a Ice, no wind, before creep | 0.0 | 85.700 | 77.99 | 9.965 | 0.00 | 0.000 | 0.00 | 32.30 | 366.0 | 150.00 | 3.566 |
0°C still air (initial LC) 0°C — Still air, before creep | 0.0 | 45.000 | 40.95 | 8.225 | 0.00 | 0.000 | 0.00 | 0.00 | 302.1 | 150.00 | 6.792 |
0°C still air (T.O.) 0°C — Still air, after creep | 0.0 | 40.279 | 36.65 | 9.191 | 0.00 | 0.000 | 0.00 | 0.00 | 337.6 | 150.00 | 7.588 |
Load case 2a Ice, no wind, after creep | 0.0 | 80.631 | 73.37 | 10.593 | 0.00 | 0.000 | 0.00 | 32.30 | 389.1 | 150.00 | 3.790 |
Load case 3, B 0°C, ice+normal wind, after creep | 0.0 | 80.631 | 73.37 | 10.001 | 19.25 | 3.493 | 18.80 | 29.11 | 367.3 | 150.00 | 3.790 |
Load case 1a High wind — 0°C, bare, after creep | 0.0 | 47.849 | 43.54 | 7.737 | 35.21 | 5.459 | 17.44 | 0.00 | 284.2 | 150.00 | 6.387 |
Load case G +15°C, no wind, after creep | 15.0 | 37.631 | 34.24 | 9.839 | 0.00 | 0.000 | 0.00 | 0.00 | 361.4 | 150.00 | 8.121 |
Load case F +15°C, 30% wind, after creep | 15.0 | 37.865 | 34.46 | 9.778 | 6.78 | 1.163 | 2.94 | 0.00 | 359.2 | 150.00 | 8.071 |
Load case C +15°C, normal wind, after creep | 15.0 | 40.127 | 36.52 | 9.227 | 21.62 | 3.658 | 9.80 | 0.00 | 338.9 | 150.00 | 7.616 |
Maximum temperature Maximum temperature | 50.0 | 32.918 | 29.95 | 11.251 | 0.00 | 0.000 | 0.00 | 0.00 | 413.3 | 150.00 | 9.284 |
Short-circuit temperature margin Short-circuit margin | 150.0 | 25.236 | 22.97 | 14.692 | 0.00 | 0.000 | 0.00 | 0.00 | 539.7 | 150.00 | 12.110 |
Temperature at short-circuit conditions Short-circuit temperature (SE.2.5) | 200.0 | 22.935 | 20.87 | 16.175 | 0.00 | 0.000 | 0.00 | 0.00 | 594.1 | 150.00 | 13.326 |