What do the first, second, and third levels of distribution boxes mean? What are their uses and functions?
Publisher: Foshan Meilijin Electric Technology Co., Ltd. Time: 2021/12/2710:02:23
What do the primary, secondary, and tertiary boxes of a distribution box mean? This is a relative issue. Let's make a hypothesis: there is a newly built residential area that introduces a 10KV incoming line and builds a distribution room. The outgoing line from the low-voltage end of the transformer is 0.4KV, and it is connected to the distribution cabinet (a graded generator)
The cabinet is then led out to the distribution box (secondary distribution box) in each building, and then to the distribution cabinet (tertiary distribution) in each unit building, finally entering the household.
Generally, primary distribution does not allow direct use of electrical equipment, while secondary distribution will have power equipment behind it, as it is three-phase electricity,
The third level distribution is the mains power (220V). As for the equipment inside, there are certain differences: there are usually isolation knives inside the primary distribution cabinet
Gates, circuit breakers, leakage protectors, etc,
In the second stage, there is a large three-phase circuit breaker, while in the third stage, there is a single-phase circuit breaker. Of course, this is an example of selecting equipment based on different electricity loads. Next, let's learn in detail about the first, second, and third grading levels
The role and purpose of electricity
(1) Primary distribution box
The construction power distribution cabinet is designed specifically for the special situation of construction sites, in accordance with the relevant construction electricity specifications and standards of the construction department. The complete set of products can form a complete three-level protection system for construction electricity, achieving one machine and one machine
The purpose of gate protection is very su