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Help CenterMEGATRO 750kV Double Circuit Cross-river Suspension Transmission Tower
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This photo refers to our 750kV double circuit cross-river suspension transmission tower, it is widely used in our Chinese market. Some of technical features of this tower as follow:
1climate condition
Item |
Temperature (℃) |
Wind speed (m/s) |
Ice thickness (mm) |
Max. temperature |
+40 |
0 |
0 |
Mini. temperature |
-30 |
0 |
0 |
Ice thickness |
-5 |
10 |
10 |
Basic wind speed |
-5 |
27 |
0 |
Installation condition |
-15 |
10 |
0 |
Annual temperature |
10 |
0 |
0 |
Lightning overvoltage |
15 |
10 |
0 |
Operation overvoltage |
10 |
15 |
0 |
2 Technical specification of conductor and OPGW
|
Item |
Conductor |
OPGW |
|
LGJ-400/50 |
JLB20A-150 |
||
|
construction |
AL |
54×3.07 |
|
Steel(Al wrap steel ) |
7×3.07 |
19×3.15 |
|
Cross-section (mm2) |
451.55 |
148.07 |
|
Overall diameter (mm) |
27.63 |
15.75 |
|
Weight (kg/m) |
1.511 |
0.990 |
|
|
Conductor broken force (Earth wire: overall broken force, N) |
123400 |
178570 |
|
DC resistance (Ω/km) at 20℃ |
0.07232 |
0.58070 |
|
Elastic module (MPa) |
69000 |
147200 |
|
coefficient of linear expansion (1/℃) |
1.93×10-5 |
1.30×10-5 |
|
3 type and force of conductor and OPGW
|
Power voltage |
750KV
|
Conductor type |
6×LGJ-400/50 |
Max. operation Tension force (N) |
46892 |
Un-balance Stress value(%) |
20 |
|
OPGW Type |
JLB20A-150 |
Max. operation Tension force (N) |
51020
|
Un-balance Stress value(%) |
100
|
4 Operation data
|
Item
|
Horizontal span (m) |
Vertical Span (m) |
Representative Span (m) |
Angle º |
Height (m) |
KV
|
|
data |
500 |
700 |
400 |
48 |
0.75 |
||
480 |
54 |
||||||
5 loading data
|
Site condition |
Normal operation condition |
Accident condition |
Installation condition |
|||||
Basic wind speed |
Ice |
Mini. temperature |
Non-broken |
broken |
||||
|
Climate condition (t/v/b) |
-5/27/0 |
-5/10/10 |
-30/0/0 |
-5/0/10 |
-5/0/10 |
15/0/0 |
||
Horizontal loading |
conductor |
49820 |
12860 |
0 |
0 |
0 |
5770 |
|
|
Insulator Power fitting |
2580 |
340 |
0 |
0 |
0 |
283 |
||
OPGW |
7104 |
3231 |
0 |
0 |
0 |
|||
|
Vertical loading
|
conductor |
68866 |
109281 |
66995 |
109281 |
109281 |
111018 |
|
Insulator Power fitting |
20000 |
21803 |
20000 |
21803 |
21803 |
33000 |
||
OPGW |
7147 |
15425 |
7063 |
15425 |
9254 |
15497 |
||
Stress force |
conductor |
One side |
0 |
0 |
0 |
0 |
0 |
28135 |
The other side |
0 |
0 |
0 |
0 |
0 |
0 |
||
Stress differences |
70355 |
56270 |
||||||
OPGW |
One side |
0 |
0 |
0 |
0 |
0 |
10204 |
|
The other side |
0 |
0 |
0 |
0 |
0 |
0 |
||
Stress differences |
51020 |
|||||||
6 Foundation distance size
|
Nominal Height (m) |
Foundation distance (mm) |
Anchor bolt foundation distance |
|||
|
Front distance |
Side distance |
Front foundation distance (mm) |
Side foundation distance (mm) |
Size |
|
33 |
12648 |
12648 |
320 |
320 |
8×M48 |
36 |
13308 |
13308 |
|||
39 |
13968 |
13968 |
|||
42 |
14628 |
14628 |
|||
45 |
15288 |
15288 |
|||
48 |
12948 |
12948 |
|||
51 |
16608 |
16608 |
|||
54 |
17268 |
17268 |
|||
8 Foundation force
Nominal Height (m) |
Tx |
Tx |
Ty |
Nx |
Nx |
Ny |
33 |
1624 |
218 |
205 |
2068 |
272 |
250 |
36 |
1663 |
233 |
217 |
2119 |
290 |
264 |
39 |
1696 |
254 |
234 |
2166 |
314 |
282 |
42 |
1701 |
230 |
216 |
2168 |
287 |
265 |
45 |
1737 |
243 |
227 |
2215 |
303 |
277 |
48 |
1830 |
249 |
233 |
2328 |
310 |
285 |
51 |
1867 |
264 |
245 |
2375 |
326 |
298 |
54 |
1901 |
282 |
259 |
2421 |
346 |
313 |
9 Nominal height and tower weight
Nominal height (m) |
33 |
36 |
39 |
42 |
45 |
48 |
51 |
54 |
Tower weight (kg) |
67862 |
69899 |
71990 |
94335 |
80983 |
82922 |
84912 |
86930 |
10 Here is the design strength of Chinese tower steel
Steel material |
Anti-push, bending and press strength (N/mm2) |
Anti-shear strength (N/mm2) |
|
Grade |
Thickness or diameter (mm) |
||
|
Q235 Steel |
≤16 |
215 |
125 |
>16～40 |
205 |
120 |
|
>40～60 |
200 |
115 |
|
>60～100 |
190 |
110 |
|
|
Q345 Steel |
≤16 |
310 |
180 |
>16～35 |
295 |
170 |
|
>35～50 |
265 |
155 |
|
>50～100 |
250 |
145 |
|
|
Q420 Steel |
≤16 |
380 |
220 |
>16～35 |
360 |
210 |
|
>35～50 |
340 |
195 |
|
>50～100 |
325 |
185 |
|
|
Q460 Steel |
≤16 |
415 |
240 |
>16～35 |
395 |
230 |
|
>35～50 |
380 |
220 |
|
>50～100 |
360 |
210 |
|
11 Here is the design strength of our Chinese tower bolts
Item |
Grade |
Anti-push strength (N/mm2) |
Anti-shear strength (N/mm2) |
|
Fastener for towers |
4.8 |
200 |
170 |
5.8 |
240 |
210 |
|
6.8 |
300 |
240 |
|
8.8 |
400 |
300 |
|
|
Anchor bolts |
Q235 |
160 |
/ |
Chinese 35 steel |
190 |
/ |
|
Chinese 45 steel |
215 |
/ |
Remark: above technical data only references for our client, we can design every type for our overseas clients.
MEGATRO is a full service engineering company with a global reputation for delivering excellence and innovation in power transmission, transformation, distribution, and telecommunications systems. Our MEGATRO provide and design this type 750KV 7A1-ZB1 tangent type transmission tower mainly for our Chinese and overseas client. Since 2004, MEGATRO focus mainly international market and had export many kind of transmission structures to overseas clients. MEGATRO has been manufacturing lattice transmission tower & tapered steel poles for lighting, traffic control, communication and utility applications. MEGATRO pioneered the development of transmission tower, telecom tower, substation, and other steel structure and was also at the forefront in the design of Transmission tower.
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