The common low-voltage distribution cabinet and high-voltage distribution cabinet are not only the distribution cabinet itself, but actually the electrical complete set of equipment we commonly call. In fact, this name is inaccurate, and the scientific name should be "complete set of power distribution device". So why is the switch cabinet called "complete power distribution device"? The following editor will explain to you:
The complete set of power distribution device is the electrical equipment mainly based on the circuit breaker. The complete set of power distribution device is the equipment supplied by the manufacturer in a complete set. The manufacturer assembles the high and low voltage electrical equipment (including control electrical equipment, protection electrical equipment, measuring electrical equipment, such as circuit breaker, disconnector, mutual inductor, etc.), bus, current-carrying conductor, insulator, etc. of each circuit in a closed or semi-closed metal cabinet according to the requirements of the main wiring in advance, Each unit circuit sub-cabinet forms a complete set of power distribution device. During installation, each unit and sub-cabinet (also called bay) are combined according to the main wiring mode to form the whole power distribution device.
In the complete set of electrical equipment, the equipment consisting of bus, disconnector (high voltage), knife switch (low voltage), circuit breaker (air switch), voltage transformer, current transformer, power transformer, AC contactor, protective relay (thermal relay), lightning arrester, etc. is called primary equipment. The circuit composed of them according to the principle relationship is called primary circuit or primary scheme diagram.
In order to ensure the safe, reliable and stable operation of the primary system, monitor the operation status of the primary system at any time, and control the primary system at any time, many other electrical components and equipment must be equipped. Such as measuring instruments (ammeter, voltmeter, power factor meter, power meter, frequency meter, etc.), control signal elements (signal lamp, button, universal transfer switch, etc.), relay protection devices, etc. The circuit composed of them according to the principle relationship is called secondary circuit or secondary scheme diagram.
Characteristics of complete power distribution device
1. The complete set of equipment is protected by a metal shell (cabinet). The electrical equipment and current-carrying conductor are not easy to accumulate dust and are easy to maintain, especially in the external polluted areas.
2. The complete set of equipment is easy to realize serialization and standardization, and has the characteristics of good assembly quality, fast speed and high operation reliability. Due to the finalization design and production, the structure is compact, the layout is reasonable, the volume and floor area are reduced, and the cost is reduced.
3. The electrical installation of the complete set of equipment, the line laying and the construction of the transformation and distribution room are carried out separately, which shortens the time of capital construction.
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