Installation Precautions for Dense Insulated Bus Ducts
The dense insulated busway has advantages such as small size, compact structure, high current transmission, safety, and convenient maintenance. It is widely used in low-voltage distribution systems in enterprises. However, during the construction management process, it was found that due to the monotonous product specifications of manufacturers, overly simple installation manuals, and design considerations for small circumference, connector torque bolts often pose difficulties during on-site installation. The following are several issues to be aware of during the installation of dense insulated busways from transformers to low-voltage distribution cabinets, including connector torque bolts, for reference during construction.
Checked the busbar channeliWe are about to measure the positioning and manufacture the suspension brackets. The shape of the brackets is determined by the location and weight of the enclosed busbar channel installation, and there are three types of busbar installation methods: vertical, horizontal side, and horizontal suspended. Connector torque bolts are sought. Brackets can be provided by the manufacturer according to the user's requirements or can be made independently. Bracket fabrication generally uses "I," "U," "L," and "T" shapes. The drilling of the hanger should be done with a bench drill or an electric hand drill. Connector torque bolts from the manufacturer; the hole diameter should not exceed 2mm of the fixed bolt diameter. Under no circumstances should electric or gas welding be used to cut holes. The threading of the hanger should also be done with a threading machine or threading plate, and it is not allowed to have tangled or broken threads.
To ensure the safe operation of the power supply system and energy saving, the maximum allowable temperature rise of busbars is a technical parameter used to evaluate busbar products. Low-voltage power transmission mains include wires, cables, branch cables, busbars, bare conductive bars, and piercing cables, etc. Due to the different heat dissipation of various products, the current-carrying capacity per square millimeter also varies: the same product and conductor specification will have different temperature rises when the same current passes through; the same conductor cross-sectional area will also have different temperature rises due to different design structures. Of course, as the temperature rise increases, the resistance value also increases, as does the voltage drop, and the loss of electrical energy also increases. For example: a 35mm2 wire has a lower temperature rise when carrying 80A current, meets the standard when carrying 100A current, but exceeds the standard when carrying 120A or 150A current, causing the insulation material to age rapidly and potentially leading to a short-circuit accident. If a 35mm2 wire carries 100A current, each mm2 is equivalent to carrying 2.85A current, while an additional 6mm2 wire carries 38A current, each mm2 is equivalent to carrying 6.3A current. If the 6mm2 wire were to carry the same current density of 2.85A per mm2, the current through the 6mm2 wire would be 18A, resulting in much lower voltage drop and electrical loss compared to the 35mm2 wire, all due to the reduced conductor temperature rise. Busbars are similar in this regard, so it is incorrect to calculate the conductivity of busbar conductors based on the current-carrying capacity per mm2 (current density). Instead, different design structures, heat dissipation, skin effect, and factors such as impedance and reactance are closely related to the current-carrying capacity. Therefore, GB7251-2006 (equivalent to the International Electrotechnical Standard IEC60439.2-2000) stipulates that the current-carrying capacity of busbars is determined by the rated current that passes through at the maximum allowable temperature rise.
Connector Torque Bolt Manufacturer - Connector Torque Bolt - Suzhou Kaidu Electric (View) provided by Suzhou Kaidu Electric Co., Ltd. Located at No. 123, Suzhou Avenue East, Suzhou Industrial Park, Jiangsu Province. Striving and developing amidst the surge of the market economy, Kaidu Electric currently enjoys a good reputation in the manufacturing of electronic and electrical products. Kaidu Electric's achievement of the entire network signifies a new height in our service and management levels. All employees of Kaidu Electric are willing to work with distinguished individuals from all walks of life to develop together and create a brighter future.
