Insulator swing & tensile strength

Calculate insulator chain swing angles for all load cases.

Line & span inputs

LineRuling span [m]

Initial tension [MPa]

Height above ground [m]

Min temperature [°C]

Max temperature [°C]

Short-circuit temp [°C]

Ice thickness modeNorm ice line category

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

Name: 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

Insulator & spans

Conductors per phase

Tower deviation angle [gon]

Wind span [m]

Weight span at max line temperature [m]

Insulator chain length [m]

Insulator chain mass [kg] (−1 = no swing, vertical chain only)

Counterweight mass [kg]

Number of insulator strings

User-defined load case (case 18)

Temperature [°C]

Wind factor

IceCreep

Insulator ultimate tensile strength check (SS-EN 50341-2-18)

Per §10.7/SE.1 the design action $\htmlData{uts-var=Ed}{E_d}$ shall not exceed $\htmlData{uts-var=Rd}{R_d} = \htmlData{uts-var=Fuk}{F_{uk}}/\htmlData{uts-var=gammaM}{\gamma_M}$ .

Suspension

\htmlData{uts-var=Ed}{E_d} = \sqrt{\htmlData{uts-var=Fh}{F_h}^2 + \htmlData{uts-var=Fv}{F_v}^2}

$\htmlData{uts-var=Fh}{F_h} = \htmlData{uts-var=n}{n} \cdot (\htmlData{uts-var=av}{a_v} \htmlData{uts-var=qv}{q_v} + 0.16\,\htmlData{uts-var=KL}{K_L} \htmlData{uts-var=qh}{q_h} + 2\sin\!\left(\tfrac{\htmlData{uts-var=beta}{\beta}}{2}\right)\htmlData{uts-var=A}{ A }\htmlData{uts-var=sigma}{\sigma})$
$\htmlData{uts-var=Fv}{F_v} = \htmlData{uts-var=n}{n} \cdot \htmlData{uts-var=av}{a_v} \cdot (\htmlData{uts-var=qe}{q_e} + \htmlData{uts-var=qis}{q_{is}}) + \htmlData{uts-var=g}{g \cdot} (\htmlData{uts-var=KV}{K_V} + \htmlData{uts-var=TV}{T_V})$

Tension

\htmlData{uts-var=Ed}{E_d} = \htmlData{uts-var=n}{n}\htmlData{uts-var=A}{ A }\htmlData{uts-var=sigma}{\sigma}

Required Fuk (suspension and tension)

\htmlData{uts-var=Fuk}{F_{uk}} = \htmlData{uts-var=Ed}{E_d} \htmlData{uts-var=gammaM}{\gamma_M}

Governing case — suspension

Load case 3, A

wind direction +

Governing case — tension

Load case 3, A

Suspension

Ed [kN]

58.92

Min. Fuk Porcelain, glass or composite insulator (γM = 2.5) [kN]

147.30U210

Min. Fuk pin / line-post (γM = 2) [kN]

117.84U120

Tension

Ed [kN]

233.96

Min. Fuk Porcelain, glass or composite insulator (γM = 2.5) [kN]

584.902 strings · U300 per string

Min. Fuk pin / line-post (γM = 2) [kN]

467.922 strings · U300 per string

Results

Rows with the highest tension are tinted amber. 0°C still air (T.O.) (0°C — Still air, after creep) uses a blue cell tint. Export CSV or PDF to share.

Case	Temp [°C]	σ [MPa]	Tension [kN]	Sag [m]	Wind [N/m]	Ice [N/m]	Weight span av [m]	`qh` [Pa]	Transverse +			Transverse −
Case	Temp [°C]	σ [MPa]	Tension [kN]	Sag [m]	Wind [N/m]	Ice [N/m]	Weight span av [m]	`qh` [Pa]	Blow-out [°]	Chain Δv [m]	Chain Δh [m]	Blow-out [°]	Chain Δv [m]	Chain Δh [m]
Load case H Min temp, no wind, before creep	-40.0	58.314	53.07	6.345	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—
Load case D Min temp at wind, before creep	-20.0	53.494	48.68	6.918	9.80	0.00	330.000	500.00	21.879	3.990	1.602	-21.879	3.990	-1.602
Load case E +15°C, 30% wind, before creep	15.0	41.849	38.08	8.845	2.94	0.00	330.000	150.00	6.869	4.269	0.514	-6.869	4.269	-0.514
Load case 1a 0°C, bare, before creep	0.0	52.775	48.02	7.013	17.44	0.00	330.000	890.00	35.557	3.498	2.500	-35.557	3.498	-2.500
Load case 3, A 0°C, ice+normal wind, before creep	0.0	85.700	77.99	9.408	18.80	29.11	330.000	500.00	19.475	4.054	1.434	-19.475	4.054	-1.434
Load case 2a Ice, no wind, before creep	0.0	85.700	77.99	9.965	0.00	32.30	330.000	—	0.000	4.300	0.000	—	—	—
0°C still air (initial LC) 0°C — Still air, before creep	0.0	45.000	40.95	8.225	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—
0°C still air (T.O.) 0°C — Still air, after creep	0.0	40.279	36.65	9.191	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—
Load case 2a Ice, no wind, after creep	0.0	80.631	73.37	10.593	0.00	32.30	330.000	—	0.000	4.300	0.000	—	—	—
Load case 3, B 0°C, ice+normal wind, after creep	0.0	80.631	73.37	10.001	18.80	29.11	330.000	500.00	19.475	4.054	1.434	-19.475	4.054	-1.434
Load case 1a High wind — 0°C, bare, after creep	0.0	47.849	43.54	7.737	17.44	0.00	330.000	890.00	35.557	3.498	2.500	-35.557	3.498	-2.500
Load case G +15°C, no wind, after creep	15.0	37.631	34.24	9.839	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—
Load case F +15°C, 30% wind, after creep	15.0	37.865	34.46	9.778	2.94	0.00	330.000	150.00	6.869	4.269	0.514	-6.869	4.269	-0.514
Load case C +15°C, normal wind, after creep	15.0	40.127	36.52	9.227	9.80	0.00	330.000	500.00	21.879	3.990	1.602	-21.879	3.990	-1.602
Maximum temperature Maximum temperature	50.0	32.918	29.95	11.251	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—
Short-circuit temperature margin Short-circuit margin	150.0	25.236	22.97	14.692	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—
Temperature at short-circuit conditions Short-circuit temperature (SE.2.5)	200.0	22.935	20.87	16.175	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—
User-defined load case User-defined	0.0	45.000	40.95	8.225	0.00	0.00	330.000	—	0.000	4.300	0.000	—	—	—