The metal enclosed outer shell of the busbar can protect the busbar from mechanical damage or animal damage. The installation of the insertion unit in the distribution system is safe. The shell can be used as a whole grounding, the grounding is very reliable, and the PVC shell of the cable is vulnerable to mechanical and animal damage. The power supply must be cut first when installing the cable, if there is a cable. Mistakes can be very dangerous, especially if the cables are to be grounded, and the unreliability of the grounding will increase the risk.
Busbar adopts copper bar or aluminum row. Its current density is large, resistance is small, skin effect is small, no need to reduce capacity. A small voltage drop means less energy consumption and ultimately saves user investment. For cable, the core area of the cable core is larger than that of the current grade bus. And its
The dense busbar shell is used as the PE line, with low reactance, good continuity of protection circuit, safety and reliability, and energy saving. Its characteristics are good dynamic and thermal stability, small volume, good heat dissipation, low temperature rise, space saving, small pressure drop, and low energy loss, which is suitable for the transmission of high-power current.
Dense insulation is connected to the busbar slot. Its moistureproof and heat dissipation effect is poor. In terms of moisture resistance, busbars are susceptible to moisture and seepage during construction, resulting in a decrease in insulation resistance between phases.
The heat dissipation of dense busbar busbar mainly depends on the shell. Because of the compact arrangement between line and line, the heat energy of L2 and L3 phase is slow, and the temperature rise of the busbar groove is high.
The dense insulation socket bus bar is restricted by the shell plate, and can only produce a horizontal section not larger than 3m. Due to the small air gap between buses, the busbar can generate strong electric force when the bus passes through a large current, resulting in superposition of the frequency of magnetic oscillation, resulting in excessive noise.
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