Megatro 230kv 230njsz90 DC Heavy Angle Tension and Transmission Tower

• Usage: Crossing Tower, Tension Tower, Angle Tower, Terminal Tower, Transposition Tower, Branching Tower, According to Client′s Technical Specification
• Conductor Circuit: Double Circuit
• Certification: ISO, GS
• Model NO.: MGP-230KV- 230NJSZ90
• Materials: Steel
• Standard: Nonstandard
• Style: Independence Tower
• Structure: According to Client′s Technical Specification
• We Can Design by Pls & Tower Software: as Per Client Design and Data
• Transport Package: Export Stnadard Package
• Specification: AS PER CLIENT
• Trademark: MEGATRO
• Origin: Shandong, China
• HS Code: 73082000
• Production Capacity: 40000 Tons/Year

Product Description

MEGATRO 230KV 230NJSZ90 DC heavy angle tension and transmission tower
This photo refers to our 230KV 230NJSZ90 DC heavy angle tension and transmission tower, it is widely used in our Chinese market. Some of technical features of this tower as follow:
SPECIFICATION

Tower	230KV 230NJSZ90 DC heavy angle tension and transmission tower
(a)  Type of Tower	-     Hot dip galvanized Steel,Lattice Tower
	Horizontal phase configuration Twin Bundle
(b)  Foundation	-     Reinforced concrete foundation on stub angle
(c ) Center to center distance	-     (F,H,J) (7.8 m, 8 m, 8 m)
(d)  Tower height	-     18 m,21 m,24 m
(Vertical distance between the lowest boom of cross-arm and the top of
concrete foundation)
(e)  Steel	-     St-37,St-52 according to DIN 17100
(f)  Bolts	-     St-4.6 or St-8.8 according to DIN 267
(g)  Welding	-     Shall be electric arc, according to DIN 4100
(h)  Minimum thickness of web member	-     5 mm
and nominal member
(i)  Minimum thickness of Gussets	-     7 mm
(j)  Minimum thickness of stub member	-     9 mm
(k)  Minimum width of Angle Iron	-     45 mm
(l)  Minimum distance from	-     According to UDE 021015.69 = 25d
centre of bolt holes to the	( d = diameter of hole)
edge of any steel section

1. Design Temperater and wind data

Mainly Meteorological Data
Design Meteorological	Temperature (˚C)		Wind Velocity (m/s)
Conditions
Max.Ambient Temperature	45		0
Everyday Temperature	28		0
Min. Temperature	10		0
Max. wind	-		35 at 28˚C
Installing Condition	25		10
Max. Conductor Temperature	75		0

 

1. Type and specification for OPGW insulator and conductor

Type		ACSR Conductor          (605 MCM, Duck)	Earth Wire                   (GJ-50)
Structure (no./mm)	Aluminum	54/2.69
	Steel	7/2.69	19/1.8
Outside Diameter		24.21	9
Sectional Area (mm^2)	Aluminum	306.9
	Steel	39.79	50
Overall Section Area (mm^2)		346.69	50
Unit Weight (kg/km)		1.159	0.384
Ultimate Strength (kN)		101.6	59
Comprehensive Elastic Factor (N/mm^2)		70000	181300
Comprehensive Expansion Factor (1/C x 10E -6)		19.3	11.5
20˚C Direct Current Resistance		0.09423
Breaking Stress (N/mm^2)		278	1170
Actual Max. Stress (N/mm^2)		106	288
Everyday Operation Stress (N/mm^2)		61	190
Normalization		CSA-C49-1965	GB1200-88

 

1. Design date

 

Type			XP-120
Height (mm)			146
Disc diameter (mm)			254
Leakage distance (mm)			320
Marking of connection			16 mmA
Nominal electro-mechanical failing load (kN)			120
Withstand voltage (kV)	Power Frequency	Dry	70
		Wet	40
	Lighting impulse		110
Power frequency breakdown voltage (kV)			110

1. LOADING DATA

The following broken wire condition shall be taken on the design of towers.
Single Circuit Tower
(i)Suspension Tower	:   Any one phase conductor (twin
	bundle) or one ground wire
	Broken at either side of the tower;
(ii)Tension Tower	:   Any one phase conductor (twin
	bundle) and one ground wire
	(or) Any Two phase conductor
	Broken at either side of the tower;
Factor of safety for loading
Suspension Tower	Tension Tower
2.0	2.0
1.5	1.5
Maximum slenderness ratio
(a) Tower legs,main compression members	150
in cross arms and earth wire peaks
(b) Other compression members carrying	200
calculated stress
(c ) Redundant members,	250
(d) Tension member of tower cross arms(hanger)	375
(e) All other tension members	500

 

1.  Operation data

Tower Type	Deviation Angle	Wind Span	Weight Span
Suspension	0˚	400	600
Angle	0˚ - 20˚	400	600
Angle	20˚ - 40˚	450	700
Shielding Angle
For Suspension Tower	-   < 30 Deg
For Angle & Terminal Tower	-   < 35 Deg
Max; working tension of conductor(EDS)	-   < 22 % of UTS
Max; working tension of conductor(Max; wind)	-   < 40 % of UTS
Earth wire Sag	-   < 80 % of conductor Sag
Galvanizing	-   610 g/m^2
Normal Span	- 350 m

3 Here is the design strength of Chinese tower steel

Steel material		Anti-push, bending and press strength (N/mm^2)	Anti-shear strength (N/mm^2)
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

 
5 Here is the design strength of our Chinese tower bolts

Item	Grade	Anti-push strength (N/mm^2)	Anti-shear strength (N/mm^2)
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 230KV 230NJSZ90 DC heavy angle tension and transmission tower r 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.


Over 10 years of experience and innovation in engineering, designing and building towers has evolved MEGATRO into its current form:

• Full Turn-Key provider including site acquisition, engineering services, manufacturing,  field services-DAS, tech services, value added reseller and monitoring, maintenance and network ownership
• Specialize in developing supplying and building wireless and wired networks and in-building telecommunications systems, as well as energy infrastructure
• Single source from Design to System Integration
• Top quality, ISO 9001 registered

A complete selection of towers including self-support, lattice steel tower, monopoles and guyed towers, form custom-designed radar towers to broadcast towers and energy infrastructure. MEGATRO carries a variety of related products including fall protection, transmission lines, antennas, obstruction lights, and accessories, and other products if client need, MEGATRO also tailored product as per client condition.
MEGATRO mainly design all kinds of towers and posts for:

1. Telecoms
2. Power transmission
3. TV and Radio Broadcast
4. Roads and City Development
5. Wind energy solution
6. Steel structure and workshop

 
Our complete selection of towers includes:

1. Self-supporting
2. Monopoles
3. Guyed towers
4. Custom-designed radar towers
5. Broadcast towers
6. Power transmission

 
MEGATRO also designs and manufactures tower related products including:

1. Fall protection
2. Antenna brackets
3. Other accessories if needed by clients

Today, with over 10 years of experience and our commitment to excellence, MEGATRO remains an industry leader in the manufacture and design of steel tubular & angular & monopole structures for all Highway, Municipal, Custom, telecom, lighting and electric Utility applications. MEGATRO has a complete staff of professional engineering personnel trained in the PLS Pole program and three different manufacturing processes for producing steel towers, poles and other supports. We utilize the latest versions of PLS-CADD, PLS-POLE, TOWER, AutoCAD and other CAD software.
 
The structure shall be designed according to load combinations given as per IEC 61936-1 and as illustrated below:
Normal loads
1 Dead weight load
2 Tension load
3 Erection load
4 wind load
 
Exceptional loads
1 Switching forces
2 short-circuit forces
3 Loss of conductor tension
4 Earthquake forces


Moreover, MEGATRO is fully equipped and qualified to carry out Design Engineering services which includes:
√ Overhead Transmission line steel tower & Telecom steel tower
   Basic Design and Analysis
√ Shop Erection Drawings
√ As-Built Drawings
 

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  230KV 230NJSZ90 DC heavy angle tension and 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 230KV 230NJSZ90 DC heavy angle tension and 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:
ASTM A 123 zinc (hot-dipped galvanized) coating on iron and steel products
DIN 55928 Protective painting of steel structure instructions
DIN 55945 Painting materials-Notions
DIN 18363 Paint work-Buildings
DIN 18364 Surface protection work for steel
DIN 53210 Determination of rust degree
DIN 55151 Determination of adhesion
ISO4628/3 Determination of rust penetration
 
MEGATRO' 230KV 230NJSZ90 DC heavy angle tension and transmission tower systems can accommodate a variety of cross-arm. MEGATRO also offers a wide variety of accessories and mounts.  
 
Other information:
Availability size: Based on the customer's requirements.
Material: Chinese material or as per clients requirement
Steel grades
Tower legs: Chinese steel Q345B, which equivalent to ASTM A572 GR50
Other webs, bracing and not stress plate and angle steel: Chinese Q235B, which equivalent to ASTM A36
Plates: Chinese steel Q345B, which equivalent to ASTM A572 GR50
Bolts: Bolt quality shall be Chinese Class 6.8 and 8.8, as per our Chinese standard, or ISO 898 standard or ASTM A394 type 0,1,2,3 requirements
The anti-theft bolts shall be Huckbolt Fasteners or approved equivalent.  The fasteners shall be manufactured from high tensile steel A242 or equivalent and hot-dip galvanized in accordance with ASTM specification A153 and A394.
 
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

General Fabrication Requirements
Here is general fabrication requirements for our transmission tower; however, both parties must discuss all drawings and confirm all shop drawings, technical specification, and which standard to conform.
Before mass production, we must received all signed approved shop drawings and technical documents from our client.
 
Our Fabrication shall be in strict accordance with detail Drawings prepared by the Contractor and approved by the Engineer.  Fabrication shall begin after the approval of the shop assembly and tests.