aluminum bus tube

1) Implementation standard: GB/T27676-2011 aluminum and aluminum alloy bus tube pipe conductor or ASTM B 317M-07
2) Product Alloy:6Z63 6063G  6R05  6101 6061 3A21 1060 1070A
3) Product Temper: H18  T10  T6  T6511
4) The product is hollow tubular structure with glossy surface, beautiful appearance and uniform size.
5)The outer diameter is from 60mm to 450mm.
6)The Wall thickness from 3mm to 15mm.
7) The length of a single bus tube pipe conductor can reach up to 15 meters.
 
1. Product Model of Full screen insulated aluminum alloy tubular busbar

Rated Voltage	Rated current	Conductor Specifications	Thermal stability current effective value （4S）	Dynamic current peak value	Sectional area	Bending radius	Temperature rise	Interphase distance	maximum outreach of cable
0.4kv- 35kv	A	mm	KA	KA	m㎡	mm	K	mm	m
	1250	Φ80x5	50	125	1178
	1600	Φ80x6	50	125	1394	350	≤40	≥275	≤8
	2000	Φ100x6	50	125	1771
	2500	Φ100x8	50	125	2312
	3150	Φ100x10	63	125	2827
	4000	Φ100x12	80	160	3315

 
2. Adapt to the installation of environmental sites of Full screen insulated aluminum alloy tubular busbar
Indoor installation or outdoor installation
Overhead, wall climbing, underground cable trench, cable interlayer, cable tunnel
Conditions of use
Altitude: ≤ 1000m (above 1000m please note it).
Maximum wind speed: 35m/s
Ambient temperature:-40℃～+50℃
Maximum daily temperature difference: 25℃
Maximum relative humidity: 95%
Sunshine intensity: 0.1W/cm
Icing thickness: 10mm
Seismic intensity: degree VIII, horizontal acceleration: 0.25g, vertical acceleration: 0.125g
Contamination level: grade IV (calculated at the highest voltage)
Creepage distance: 3.5cm/kv
Electrical properties
Rated voltage: 0.4kV ~ 35kV
Rated current: 1000A ~ 12000A
Rated frequency: 50Hz
Maximum working voltage: 0.4/1.0kv; 10/12kv; 20/24kv; 35/40.5kv
Temperature rise restriction
The temperature rise is less than 40K and the temperature rise limit is 120℃.
Partial discharge level
The apparent discharge volume under 1.5Um/√3 voltage is not greater than 20pc.
The apparent discharge volume under 1.05Um/√3 voltage is not greater than 7pc.
Dielectric loss angle
Under the voltage of 1.05Um/√3, the dielectric loss angle is tgδ≤0.005.
 
3. Composite shielded tubular busbar structure
The insulation structure of composite shielded tubular insulated busbar has the characteristics of both cable and groove busbar, so it can be widely used not only in indoor and outdoor overhead laying, but also in cable trench, cable tunnel, cable interlayer, wind power tower and other occasions. In foreign countries, similar busbar products are also known as "tube cables"
 
Insulation level of composite shielded tubular insulated busbar

Rated working voltage	Power frequency withstand voltage（1MIN）	Lightning shock（1.2/50）
10KV Product	45KV	75KV
20KV Product	65KV	125KV
35KV Product	95KV	185KV

 
4.Product Comparison of Full screen insulated aluminum alloy tubular busbar
 
Table 1
Comparison of technical performance between tubular insulated busbars and other conductors

	Tubular insulated busbars	Rectangular busbars	Cables	Isolated phase bus bar
Carrying capacity	large	larger	small	large
Insulation performance	strong	weak	strong	Normal
Mechanical strength	Very high	higher	low	higher
Heat dissipation performance	Good	Normal	Bad	Good
Loss	low	high	high	high
Electrical shock resistance	Very strong	weak	strong	weak
Anti environmental interference	strong	weak	strong	weak
Space requirements	small	large	small	Very large
Installation span	6-8M，No bridge frame	Small span，need crane span structure	mall span，need crane span structure	mall span，need crane span structure
Difficulty of installation	Simple, motorized flexible	Complex and difficult to install	Do not bend at will.	Complex and difficult to install

 
Table 2
Comparison table of economic performance between tubular insulated busbars and other conductors

	Tubular insulated busbars	Rectangular busbars	Cables	Isolated phase bus bar
Busbars Cost	higher	low	low	higher
Busbar loss	low	High	High	High
Infrastructure Cost	low	high，need crane span structure	higher，need crane span structure	high，need crane span structure
Installation cost	Bear by Factory	High	High	High
later maintenance	Maintenance free, low cost.	Regular maintenance, higher	Maintenance free, low cost.	Regular maintenance, higher
Real life	30Years	15-20Years	30Years	15-20Years
later maintenance	Basically no maintenance	Regular and high cost	less	Regular and high cost
Comprehensive cost	low	Normal	low	High

 
5. Product characteristics of Full screen insulated aluminum alloy tubular busbar
The Full screen insulated aluminum alloy tubular busbar has the following advantages over traditional busbars:
1) Large current carrying capacity
The main body of the tubular busbar is hollow copper tube or aluminum alloy tube. The surface area is large, relative to the cable and rectangular busbar.
The current density distribution on the conductor surface is uniform, and the highest rated current can reach 12000A.
2) Good insulation performance, small space occupation and wide application scope.
Tube busbar are insulated by sealed composite shielding. The grounding potential of the enclosure is zero, and the electric field distribution on the busbar surface is uniform.
Electrical insulation performance is strong. It can be directly passed through cable trench, cable interlayer and cable tunnel.
Conventional busbar (rectangular busbar and Separated-phase closed busbar) usually have higher requirements for environment and space.
Therefore, in many places where the environment is harsh and the space is narrow, the use of conventional busbar is greatly limited or even impossible to use. The tubular insulated busbar, fearless of harsh environment and occupying very little space for installation, is especially conducive to the layout in narrow space, and its application scope is wider and more reliable.
3) High mechanical strength.
The allowable stress of the main body of the tubular busbar is four times of that of the rectangular busbar. It can withstand large short circuit current and high mechanical strength.
So that the maximum length of busbar support can reach 8 meters.
4) Good heat dissipation, Low Temperature Rise
The tubular busbar is a hollow conductor, and there are ventilation holes at both ends of the bus bar.The inner diameter air channel can naturally form hot air convection.
The heat dissipation condition is better than that of the conventional busbar.
5) Low loss
The shape of the tubular busbar determines that its surface skin effect coefficient is low,Kf≤1 and the AC resistance is small.
So the bus power loss is small. The dielectric loss of the insulating layer of the composite shielded insulated busbar is less than 0.01%.
6) High heat resistance of insulating materials.
Polytetrafluoroethylene (PTFE) is the main insulating material of tubular insulated busbar. It has excellent electrical and chemical stability.
It can work normally in the temperature range of -200℃～+200℃ with low dielectric loss, flame retardant, aging resistance and other insulation materials,the service life of the product is more than 30 years.
7) Strong resistance to electrical shock.
The results of dynamic stability test show that the copper tube master with voltage 10KV and rated current 4000A can withstand 63KA (4S) short circuit current impact.
The busbar can be directly fixed on the steel frame or concrete bracket, and the wall bushing and the post insulator can be eliminated,has strong anti vibration ability.
8) Free from environmental interference and high reliability.
Each phase of the tubular busbar is closed and shielded, and there is no condensation inside, and the external humidity is eliminated,the ground and interphase short circuit faults caused by dust and foreign objects are highly reliable.
9) The busbar structure is simple, clear, easy to install and free from maintenance.
Tubular busbar structure is similar to cable, reliable insulation and high safety. Once installation is successful, life is free of maintenance.
 
6,Common tubular busbar, Liner tube & sealing ball size or sealing cover size.

Main Bus Pipe Tube		Liner Bus Pipe Tube		Sealing ball  or Sealing cover
OD (mm)	Wall Thickness (mm)	OD (mm)	Wall Thickness (mm)	OD (mm)
80	4	71	3	70
90	5	79	4	79
100	5	89	5	89
110	5	99	5	99
120	5	109	5	109
130	7	115	7	115
150	7	135	7	135
150	10	129	10	129
170	7	155	7	155
170	10	149	10	149
200	10	179	10	179
250	10	229	10	229