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MEGATRO 750KV 7A1-ZB1 tangent type transmission tower
This photo refers to our 750KV 7A1-ZB1 tangent type 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 tower design data
Tower type | Nominal Height Scope (mm) | Horizontal span (m) | Vertical Span (m) | Angle º | Nominal height tower weight(Kg) |
7A1-ZB1 | 48 | 450 | 600 | 0 | 31140 |
4 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
|
5 Operation data
Item
| Horizontal span (m) | Vertical Span (m) | Representative Span (m) | Angle º | Height (m) |
KV
| |
data | 48 | 450 | 600 | 0 | 48 | 0.80 | |
54 | 430 | 54 | |||||
6 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 | 43253 | 11574 | 0 | 0 | 0 | 5134 | |
Insulator Power fitting | 2508 | 334 | 0 | 0 | 0 | 278 | ||
OPGW | 6048 | 2362 | 0 | 0 | 0 | 656 | ||
Vertical loading
| conductor | 55744 | 93306 | 55744 | 93306 | 93306 | 91978 | |
Insulator Power fitting | 15000 | 16803 | 15000 | 16803 | 16803 | 24750 | ||
OPGW | 5821 | 13494 | 5821 | 13494 | 5096 | 12807 | ||
Stress force | conductor | One side | 0 | 0 | 0 | 0 | 0 | 28135 |
The other side | 0 | 0 | 0 | 0 | 0 | 0 | ||
Stress differences | 56270 | |||||||
OPGW | One side | 0 | 0 | 0 | 0 | 0 | 10204 | |
The other side | 0 | 0 | 0 | 0 | 0 | 0 | ||
Stress differences | 51020 | |||||||
7 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 | 7760 | 7760 | 240 | 240 | 4×M42 |
36 | 8390 | 8390 | |||
39 | 9020 | 9020 | |||
42 | 9050 | 9050 | |||
45 | 10280 | 10280 | |||
48 | 10910 | 10910 | |||
51 | 11540 | 11540 | |||
54 | 12170 | 12170 | |||
8 Foundation force
Nominal Height (m) | Tx | Tx | Ty | Nx | Nx | Ny |
33 | 532 | 72 | 63 | 736 | 98 | 83 |
36 | 550 | 73 | 65 | 756 | 99 | 84 |
39 | 552 | 73 | 65 | 769 | 100 | 85 |
42 | 568 | 74 | 67 | 784 | 100 | 87 |
45 | 573 | 75 | 68 | 801 | 103 | 89 |
48 | 598 | 81 | 72 | 840 | 110 | 96 |
51 | 613 | 81 | 72 | 857 | 110 | 96 |
54 | 627 | 82 | 74 | 869 | 111 | 98 |
9 Nominal height and tower weight
Nominal height (m) | 33 | 36 | 39 | 42 | 45 | 48 | 51 | 54 |
Tower weight (kg) | 22878 | 25251 | 26205 | 27268 | 28852 | 31140 | 33198 | 34411 |
MEGATRO performs in-house design activities specializing in electrical overhead transmission &telecom tower steel works, which include wind and earthquake loading, static analysis, stress analysis by finite element methods and fatigue. Our Engineering Department is boasting of highly qualified engineering who are conversant with international codes and standards. The work is carried out with extensive use of CAE/CAD via a large of computer network. The computer hardware & drafting software are liked to the CNC workshop equipment for downloading of information thereby eliminating error and saving valuable production time.
Besides, MEGATRO is one of the few manufactures who assemble a face of 750KV 7A1-ZB1 tangent type transmission tower. This attention to quality may not be the cheapest process but it does insure every tower meets our high standards of quality. And it helps to reduce on-site construction cost due to mismatched assemblies. After fabrication all 750KV 7A1-ZB1 tangent type transmission towers are delivered to the galvanizing facility to be Hot DIP Galvanized. Towers are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free towers. All finished surfaces shall be level and free of tears, burrs, clots and impurities.
Except otherwise specified elsewhere in the specification, the surface treatment and corrosion protection for all metal parts shall be in conformity with the latest revision of the standards listed below:
Fabrication standard: Chinese Standard or other standard which client accepted
A) Dimension and tolerance for angle are according to GB/T1591-1994, similar to EN 10056-1/2
B) Hot dip galvanization in accordance with GB/T 13912-2002, which similar to ASTM A 123
C) The welding will be performance in accordance with AWS D1.1 or CWB standard
D) All fastener galvanization conform to ASTM A153 requirements.
Package: Both parties discuss before delivery
Port of Loading: Qingdao Port
Lead Time: One month or based on the customer's needs (For time being our capacity about 5000 tons one month, and can meet client requirements)
Minimum order: 1 set
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