Busbar refers to a product made of copper (copper bar) and aluminum materials with high conductivity to transmit electric energy and have the ability to gather and distribute electricity. The main conductor used by the power station or substation to transmit electrical energy. Through it, the electrical energy output from generators, transformers or rectifiers is transmitted to individual users or other substations.
In the power system, the bus connects the various current-carrying branch circuits in the distribution unit and plays the role of accumulating, distributing and transmitting electrical energy.
According to the appearance and structure, the bus bar is roughly divided into the following three categories:
1. Hard busbar: including rectangular busbar, round busbar, tubular busbar, etc.
2. Soft busbar: including aluminum stranded wire, copper stranded wire, steel-core aluminum stranded wire, expanded hollow wire, etc.
3. Close busbar: including common box bus, split-phase bus, etc.
Performance:
The bus bar is made of copper or aluminum, which has high current density, small resistance, and small skin effect, so there is no need to reduce the capacity of the busbar. A small voltage drop also means less energy loss, which ultimately saves the user's capital. As for the cable, because the cable core is a multi-strand thin copper wire, its root area is larger than that of the bus bar of the same current level. Moreover, its "skin effect" is severe, reducing the current rating, increasing the voltage drop, and simply generating heat. The energy loss of the line is large, and it is simply aged.
The bus refers to the connection of voltage distribution devices at all levels in the substation, as well as the connection of electrical equipment such as transformers and corresponding distribution devices. The effect of the busbar is to gather, distribute and transmit electrical energy.
Difference Between Busbar and Cable:
The busbar is used to gather current. Many power and power supply circuits are connected to the bus, through which the power is gathered and sent to each circuit. Therefore, the current carrying capacity of the bus bar is relatively large, and the cross-section of the bus bar is large, so the bus bar is generally selected as a bare bus type;
Cables are used to transmit cables, and some of them use the type of cable to transmit power from the power supply to the load at a long interval. The current carrying capacity of the cable is relatively small, and the insulation method is selected, which can be laid underground, trenches and overhead structures.
From the perspective of current carrying capacity, wires and cables carry small currents, and bus bars carry large currents;
From the perspective of structural form, the wire and cable are flexible (the internal copper core and the outer insulation layer) can be bent, and the bus bar is rigid (the internal hard copper bar and the external steel or aluminum alloy shell) can not be bent, and the bend is specially manufactured;
From the point of view of the use characteristics, the wire and cable device is troublesome, each electrical equipment needs to be independently pay-off and wiring, and the bus bar is convenient and sensitive, not simple device error, a bus can be used for many points of equipment together.
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