1: The basic requirements for the bus duct:
1) Conductor data: high-purity electrical copper drawn from national standard T2 electrolytic copper, with a purity of more than 99.9% and a full-length tinned copper conductor. 2) Shell: Select high-quality aluminum-magnesium alloy profiles that meet the strength, with heat dissipation ribs, and the appearance should be treated with anti-oxidation. The thickness of the profile is required to be not less than 4mm, and the heat dissipation can be strong, the anti-corrosion can be strong, and the advantages are non-magnetic. Enclosure Protection Circuit Continuity Resistance ≤0.007Ω 3)
2: Selection specification insulation information:
The copper bar is covered with DuPont polyester film, which requires halogen-free insulation materials, flame retardant grade B or above, and heat-resistant temperature of more than 130 °C. It must go through China's compulsory certification 3C, and the production, inspection, installation and inspection meet the following specifications: IEC 60439.2-2005 "International Electrotechnical Association Specification" (National Electrotechnical Code) GA/T537-2005 "(Bus Trunk System) Flame Retardant, Fire Retardant, Fire-resistant Busway Function Experimental Method" (National Standard) JB/T 9662-2011 "Dense Insulated Busbar Trunk System" (Dense Busbar Industry Specification) GBJ 149-90 Code for construction and inspection of busbar devices in electrical installation engineering》 GB4208-2008 "Enclosure Protection Grade (IP Code)" GB5585.1-3-2005 GB6892 "Aluminum Alloy Hot Extrusion Profiles for Industrial Use" ENMABU1.1 "Busway Device and Protection Specification" GB7251.1-2005 "The first part of the list of low-voltage switchgear and control equipment: type test or part of the type test complete set of equipment" GB7251.2-2006 "Low-voltage switchgear and control equipment Part II: special requirements for bus trunk system (bus duct)" GB50303-2012 "Code for Construction Quality Inspection of Construction Electrical Engineering" In addition to the refractory bus duct in accordance with GB7251.1-2005/ GB7251.2.-2006 specification, the circuit integrity test during fire needs to be added. The refractory busway circuit integrity test needs to be carried out according to GA/T537-2005.4.3 The maximum temperature of the refractory function test is 950 °C, and the spray test is carried out after 30 minutes of fire, and the GB19216-2003 is connected to the line integrity test of 950 °C for 180 minutes and 15 minutes, and the inspection statement and 3C certification specified by the public security fire department are provided.
3: The primary skill parameters of the busbar
Bus main technical parameters table Serial No. Item Contents 1 Extra voltage 380V(AC) 2 Extra insulation voltage: 660V 2 Extra frequency 50HZ 3 Current scale According to the needs of the project 4 Protection level ≥IP54 (including with tap unit, e.g. plug-in interface, T-junction) 5 Heat resistance ≥130°C 6 Insulation class ≥B 7 Insulation resistance ≥20MΩ 8 Power frequency withstand voltage Dry test 3750V (wet test 1000V) ac or 7500Vdc/1min, no breakdown, no flashover 9 Bus type Dense busbar 10 Busway system maximum device Span ≤3m 11 Protection conditions Under normal use conditions, protection can be realized
4: Structure and heat dissipation
1) The temperature rise requirements are as follows (the manufacturer shall have a third-party temperature rise test statement for each current specification in the drawing): Note: When the goods arrive at the construction site, the bidder has the right to randomly sample and send them to the testing institute to do the temperature rise test to verify the current carrying capacity of the bus duct. 1 Busbar temperature rise under additional load ≤70K 2 Shell temperature rise under additional load ≤55K 3 Temperature rise at the joint under additional load ≤70K 2) The bus is compact in structure, reasonable in planning, beautiful in appearance, close contact between the shell and the conductor, and the whole body dissipates heat. There is no significant air distance between the busbars, and there is no air activity inside the busbar, which can prevent the chimney effect and oxidation caused by the contact between the conductor and the air. 3) The protection level of the bus duct shall not be less than IP54 (including with tap units, such as plug-in interfaces, T junction boxes, etc.).
5: Conductor data
1) Each phase is made of high-quality industrial electrolytic copper and rolled into a wide thin strip hard copper bar. In line with relevant national standards, its purity ≥ 99.9%, and resistivity ≤ 0.01777Ω.m㎡/m. 2) The outer surface of the busbar is tin plated, and the outer surface plating should have strong resistance to oxidation and corrosion. Adhere to the integrity of the conductor, and there shall be no bad planning such as center punching and end section shrinkage. 3) The data, cross-section and manufacturing process of the neutral wire are the same as those of the phase wire. 4) The grounding conductor of the bus is an aluminum alloy shell or a grounding bar is set separately (when the shell is also a PE wire, the crossover PE conductor of the two-unit bus bar must conform to the equivalent cross-sectional area of the protective conductor (PE, PEN) in Table 3 of Table 7.4.3.1.7 of GB7251.2-2006. The manufacturer shall provide third-party supporting documents). 5) The cross-section of the copper bar of the densely distributed bus duct (including the data and its process structure, etc.) should fully meet the requirements of the 3C certification type test statement.
6: Adaptor
The bus connector should be selected from the existing domestic advanced technology to ensure that the conductor is reliably connected, and the device is accurate, fast and convenient. The bus adapter is required to be independent and detachable, and the adapter with the same specification can be interchangeable to facilitate installation and protection. The adapter should consider the influence of thermal expansion and contraction of the bus duct on the equipment under the operating state, and the planning of the joint will not reduce the function of the busbar.
7: Plug-in box:
The plug-in box is required to be directly fixed in the bus duct in the manufacturer, so as to add that the mechanical connection between the plug-in box and the bus duct is more reliable, and the unreliability of the construction personnel when plugging in the site is eliminated. In order to reduce the touch resistance at the plug interface, the copper bar or cable is directly connected with bolts when the switch in the plug box is connected to the busway tap unit.
8: Shell data
And the protection level of the plug-in box should not be less than IP54; The full length of the bus duct and the plug interface is selected for the dense distribution type, and the dense body type and the plug interface air type are not allowed. 1) The high-quality aluminum-magnesium alloy shell is selected, and the shell has a heat sink to meet the mechanical strength and anti-corrosion ability. 2) Choose a fully enclosed mode, compact structure, flexible equipment, good dynamic and thermal stability, and strong resistance to internal and external impacts. 3) The outer surface of the shell is anodized. 4) The bus adopts a fully enclosed shell, which can ensure that the current carrying capacity of the bus is 100% unchanged at any device angle. 5) The resistance between any point of each bus shell and the ground terminal is not greater than 0.01 ohms.
9: Ability to tolerate
The busway is capable of accepting additional short-term withstand currents and additional peak withstand currents, and the thermal and electrical stresses that occur are not permanently detectable deformation. The short-circuit withstand current intensity value corresponding to the busway of each current specification shall not be less than the value in the following table: Extra current In(A) Icw(KA) 630A≤I<1000A 50KA 1000A≤I<2000A 65KA 2500A≤I<3600A 80KA
10. Transition articulation/bridging and device support
1) The connection between the bus duct and the transformer is silver-plated or tin-plated on the surface of the soft connection. 2) T2 electrolytic copper is used to connect the bus duct and the distribution cabinet, and the surface is rolled into a TMY copper bar, which is silver-plated or tin-plated. 3) The vertical device should be equipped with a spring bracket, the conditioning distance should not be less than 5 cm, and the base of the bracket should be made of channel steel to meet the strength. 4) The hanger is made of hot-dip galvanized angle steel, and the hanger should have a conditioning function, and the lower part of the hanger is not allowed to grow.
11: Nameplate
1) Type and name 2) Factory name or trademark 3) Factory number 4) Primary skill data 5) Fulfillment specification 6) Year and month of production 12. Product sample submission and verification a. Each manufacturer needs to send samples: the sample is a two-section bus unit with a plug-in interface that is connected and installed. It is accompanied by a sample illustration of how to ensure the above technical parameters. b. Each manufacturer shall provide the original relevant information required by this tender (such as certification certificate, type test statement or test statement, etc.) for verification and verification, and the copy shall be used as the basis for incoming inspection; or the goods arrive at the construction site, and shall be sampled and tested in accordance with the provisions of Article 4, Paragraph 1).
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