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Insulated copper tube busbar has a large surface area of hollow conductor

  • Categories:Zhongrui News
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  • Time of issue:2019-05-28 15:29
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(Summary description)Insulated copper tube busbar features With the rapid development of China's economy, the demand for electricity in the whole society is increasing. At present, the low voltage sides of 110kV and 220KV substations are rated at 10kV and 35kV. With the increase of main transformer capacity, the rated current of the low-voltage side of the transformer is also increasing. Conventional rectangular busbars are more and more difficult to meet the requirements of busbar heating and short-circuit electric power in terms of technology and structure, thereby causing additional loss and skin effect coefficient to increase, resulting in a decrease in intercepting capacity and uneven current distribution. Especially when the main transformer capacity is 180MVA and above, the main transformer 10kV outlet side not only has the electric power problem of the

Insulated copper tube busbar has a large surface area of hollow conductor

(Summary description)Insulated copper tube busbar features

With the rapid development of China's economy, the demand for electricity in the whole society is increasing. At present, the low voltage sides of 110kV and 220KV substations are rated at 10kV and 35kV. With the increase of main transformer capacity, the rated current of the low-voltage side of the transformer is also increasing. Conventional rectangular busbars are more and more difficult to meet the requirements of busbar heating and short-circuit electric power in terms of technology and structure, thereby causing additional loss and skin effect coefficient to increase, resulting in a decrease in intercepting capacity and uneven current distribution. Especially when the main transformer capacity is 180MVA and above, the main transformer 10kV outlet side not only has the electric power problem of the

  • Categories:Zhongrui News
  • Author:
  • Origin:
  • Time of issue:2019-05-28 15:29
  • Views:
Information
Insulated copper tube busbar features
 
With the rapid development of China's economy, the demand for electricity in the whole society is increasing. At present, the low voltage sides of 110kV and 220KV substations are rated at 10kV and 35kV. With the increase of main transformer capacity, the rated current of the low-voltage side of the transformer is also increasing. Conventional rectangular busbars are more and more difficult to meet the requirements of busbar heating and short-circuit electric power in terms of technology and structure, thereby causing additional loss and skin effect coefficient to increase, resulting in a decrease in intercepting capacity and uneven current distribution. Especially when the main transformer capacity is 180MVA and above, the main transformer 10kV outlet side not only has the electric power problem of the busbar bridge itself, but also the heating problem, as well as the busbar bridge insulator, the steel frame and the coagulation upper column near the busbar bridge, and the foundation. The steel bar inside induces heating problems caused by eddy currents in the electromagnetic field.
 
  Features
 
Large current carrying capacity
 
The copper tube busbar is a hollow conductor with large surface area and uniform current density distribution on the conductor surface. The copper tube conductor is Φ100X5mm, the cross-sectional area is 1491mm2, the current carrying capacity is 4000A, the current density is 2.68 (A/mm2), and the copper tube conductor is Φ100X10mm. Area: 2826mm2,
 
Current carrying capacity: 6000A, current density: 2.12 (A/mm2). Therefore, the copper busbar is particularly suitable for circuits with large operating currents.
 
Low skin effect and low power loss
 
The skin effect coefficient of the insulated copper tube busbar is low, Kf<1, and the AC resistance is small, so the power loss of the busbar is small. If multiple rectangular conductors are used, as the number of sheets increases, the skin effect coefficient increases continuously, the effective current carrying capacity per unit section decreases, the current distribution between the sheets is uneven, the additional loss increases, and the heat dissipation conditions are poor.
 
Busbar insulation is large
 
The shielded and bushing insulated copper tube busbar has metal shielding, sealing, waterproofing, shell grounding and zero potential; PTFE is used as the main insulating material, the thickness is 0.1mm, it can withstand 2000V voltage, and it is resistant to high and low temperature. (±250 ° C). Busbar main insulation material with rated voltage of 10kV is PTFE 3.6mm power frequency withstand voltage: 105kV / 1 minute. The 35kV busbar withstand voltage reaches 200kV.
 
Allows high stress and high mechanical strength
 
The allowable stress of the insulated copper tube busbar is 4 times that of the rectangular busbar, and the short-circuit current that can be withstand is large, and the mechanical strength is high, so that the span of the busbar support is increased.
 
No pollution, no condensation
 
The national standard three-level anti-pollution distance is ≥230mm, and the anti-pollution distance of insulated copper tube busbar is ≥800mm, which is more than three times of the national standard, so the insulated copper tube busbar has no pollution flash. The insulated copper tube busbar eliminates the post insulator, and the metal shield is used. The outer casing is grounded and the potential is zero. The outer casing of the support part has condensation and does not discharge.
 
Good heat dissipation and low temperature rise
 
The insulated copper tube busbar is a hollow conductor, and the inner diameter of the busbar can naturally form hot air convection. (The air pressure difference between indoor and outdoor can naturally form hot air convection), and the heat dissipation condition is good.
 
Terminal connector and intermediate connector have low contact resistance and low temperature rise
 
The terminal connector and the intermediate connector (busbar connection fittings) are connected by a hoop hoop type and a copper tube. The force is uniform between the circle and the circle, the contact surface area is large, the contact surface is larger than 10 times of the conductor cross section, and the contact resistance is smaller than the conductor resistance. The junction temperature rise is lower than the conductor.
 
The busbar structure is concise, clearly arranged, easy to install, and requires less maintenance.

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Next: What are the factors related to the temperature rise of the busway?
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Next: What are the factors related to the temperature rise of the busway?

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