Disadvantages and improvements of closed busbars
Release Time:
Dec 22,2022
Enclosed busbars are widely used electrical products in industries, residential buildings, and other sectors. They carry significant currents; therefore, even minor resistance changes in the power distribution system can generate substantial heat. Reducing the resistance of enclosed busbars is a key concern during installation. Typically, the resistance of the conductive copper bars in enclosed busbars is small; however, the contact resistance between the device and the plug-in box connector should not be overlooked. Often, enclosed busbars overheat and oxidize the surrounding copper bars when energized. Therefore, reducing the contact resistance at the busbar connections is crucial for ensuring the safety of the busbar power distribution.
Enclosed busbarThis is a widely used electrical product in industries and buildings. They carry large currents; therefore, even a slight change in resistance in the distribution system will generate a large amount of heat. How to reduceEnclosed busbarresistance is one of the key issues during the installation process. Usually,Enclosed busbarthe resistance of conductive copper bars is very small. However, do not ignore the contact resistance between the equipment and the connector box。Usually, the enclosed busbar is prone to heat generation and oxidation of the surrounding copper bars when energized.。Therefore, reducing the contact resistance at the busbar connection is crucial for ensuring the safety of busbar power distribution. So, let's learn aboutEnclosed busbarits shortcomings and improvement methods.!
Enclosed busbarThere are four problems and improvement methods.
1. During installation, air insulationEnclosed busbaris mainly connected through connector interfaces. The conductive copper bars of the connector interfaces are single-sided connectors, and the contact surface is not very tight.。It is recommended to replace the conductive copper bars at the plug connection with double-sided plugs.。Thus, the contact area of the conductive copper bars at the plug connection is doubled, and the contact resistance is doubled, thereby avoiding overheating and oxidation of the conductive copper bars here.
2. Dense insulationEnclosed busbarconnections between joints, some are connected with copper bolts by drilling holes on the conductive copper bars.。This will reduce the cross-section of the conductive copper bars, and the conductive copper bars around the drill holes will be heated and oxidized.。The author proposes using a copper pressure plate to connect the busbar joints.。The copper pressure plate is wider than the conductive copper bar steps. To ensure the tight balance between the contact of the copper pressure plate and the surface of the conductive copper bar, torque copper bolts are tightened on both sides of the copper pressure plate until the safety neck of the torque copper bolts rotates, meeting the technical requirements.
3.Enclosed busbarWhether the connection between units is reliable directly affects the safe operation of the entire power distribution system.。The quality of the busbar unit connection is determined by internal and external factors. Internal factors include the physical fitness of the installers, and external factors include the use of different installation tools, etc.。
4. Due to the lack of tightness, the contact resistance of the connection increases, the conductive copper bars overheat and oxidize, and there is a risk of accidents.。Therefore, it is recommended to use torque copper bolts and torque wrenches toEnclosed busbarprovide a scientific basis for the detection of internal connections.。Closed pipeline.
It is understood that in the installation of the plug-in box, the plug-in box is plugged in through the elasticity of its own copper sheet and clamped inEnclosed busbarthe conductive copper bars between the plug interfaces. Because of the poor elasticity of pure copper, as the number of maintenance increases, the clamping force between the copper sheet and the conductive copper bars gradually decreases, and the formation of poor contact leads to increased contact resistance, causing surrounding heat generation. It is recommended to install an auxiliary mechanical device at the insertion position of the insertion box——spring. The spring force can be controlled by adjusting the nut to keep the clamping force between the copper sheet and the conductive copper bars always at a stable level.
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