Original link: https://www.liangwazi.com/post/buchang.html
In the low-voltage power distribution room, the reactive power compensation cabinet is installed at the front end of the through-busbar (that is, close to the transformer side) or installed at the end of the through-busbar (away from the transformer side), which electrical installation position is better? good? The difference between these two different electrical installation positions for the capacity of the compensation cabinet through the busbar, the use environment and the improvement effect shows the best installation position of the reactive power compensation cabinet in the power distribution room, providing customers with an optimal and economical compensation plan .
The following are the most common installation locations, installed at the front end of the through busbar (near the transformer)
The following is the optimized installation position, installed at the end of the busbar (away from the transformer)
Type 1: Installed at the front end of the through-busbar (near the transformer)
If the compensation cabinet is installed at the front end of the through-busbar: since all load currents will flow through the through-busbar in the compensation cabinet, the capacity of the through-busbar needs to consider the carrying capacity of all load currents at the same time, so the required capacity of the through-busbar is relatively large .
The second type: installed at the end of the through busbar (away from the transformer)
Installed at the end of the through-busbar: Since the compensation cabinet is placed at the end of the through-busbar, the through-busbar in the compensation cabinet only needs to consider the operating current (including the margin) of the compensation cabinet, so the through-busbar is compared with the former. The required capacity is small.
From the perspective of equipment investment, it is the most economical and cost-effective installation position to place the compensation cabinet at the end of the busbar. However, since the current sampling transformer of the compensation cabinet is located in the main cabinet, the sampling current line should not be too long. For equipment with few outlet cabinets, it is most economical to install the compensation cabinet at the end position. For equipment with many outlet cabinets, it is recommended to install it next to the main cabinet.
Because the capacitors in the compensation cabinet are easily affected by the ambient temperature, the installation position of the compensation cabinet should also pay attention to the ambient temperature used to prolong the life of the capacitor. Installed at the front end of the through-busbar: Since the compensation cabinet is very close to the transformer with the largest heat generation, and the through-busbar in the compensation cabinet flows through a relatively large current, it will generate a higher temperature, and it is easy to indirectly increase the temperature in the compensation cabinet . Installed at the end of the through busbar: because the compensation cabinet is placed at the end of the through busbar, it is relatively far away from the transformer and the through busbar in the compensation cabinet only flows through the compensation current, so compared with the former, the generation in the compensation cabinet is lower loss and temperature.
Regardless of whether the compensation cabinet is placed at the front end or the end of the most penetrating busbar, its compensation effects on system power factor improvement, system apparent current reduction and harmonic control are the same. At the end, it does not affect the improvement effect of the compensation cabinet.
This article is transferred from: https://www.liangwazi.com/post/buchang.html
This site is only for collection, and the copyright belongs to the original author.