Analysis of Internal Structure of Distribution Cabinet
Release time:
2022-05-11
"Distribution box", also known as power distribution cabinet, is the general name of the motor control center. The distribution box is a low-voltage distribution device that assembles switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen according to electrical wiring requirements.
MatchingElectric cabinetinternal structure analysis
"Distribution box", also known as power distribution cabinet, is the general name of the motor control center. The distribution box is a low-voltage distribution device that assembles switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or screen according to electrical wiring requirements.
Use of power distribution cabinet
It is a complete set of devices for centralized installation of switches, instruments and other equipment.
Commonly used distribution boxes are made of wood and iron. At present, electricity consumption is quite large everywhere, so iron is still used more. The purpose of the distribution box: of course, it is convenient to stop power transmission and play a role in measuring and judging the power transmission.
Composition of distribution box
Mainly divided into two parts.
It is a complete set of components, that is, the shell of the distribution box and its related accessories.
The second is the electrical components and related accessories, namely the air switch and its required accessories.
distribution cabinet manufacturers: circuit breaker
Circuit breaker: not only a switch, but also the main component of the power distribution cabinet. Commonly used switches include air switches, leakage switches, and dual power automatic transfer switches.
1. Air switch:
Power distribution cabinet manufacturers: the concept of air switch
The air switch, I .e. the on and off circuit, carries the rated working current and the fault current such as short circuit and overload, and can quickly shut down the circuit for reliable protection under the conditions of overload, short circuit and undervoltage.
There are many design types of moving and static contacts and contact rods of circuit breakers, but the main purpose is to improve the breaking capacity of circuit breakers. At present, the current limiting principle of using a certain contact structure to limit the peak value of short-circuit current during breaking has an obvious effect on improving the breaking capacity of the circuit breaker, and is widely used.
Power distribution cabinet manufacturers: working principle of air switch
Automatic air switch, also known as low-voltage circuit breaker, can be used to connect and disconnect the load circuit, and can also be used to control the motor that does not start frequently. Its function is equivalent to the sum of some or all functions of knife switch, overcurrent relay, voltage loss relay, thermal relay, leakage protector, etc. It is an important protection appliance in low voltage distribution network.
The automatic air switch has a variety of protection functions (overload, short circuit, under voltage protection, etc.), adjustable action value, high breaking capacity, convenient operation and safety, so it is widely used at present.
distribution cabinet manufacturers: leakage protection switch
A. The concept of leakage protection switch:
It not only has the function of leakage protection, but also trips when people are in contact with electricity to ensure personal safety. This is the main function of the leakage protector. If the electrical equipment is poorly insulated and leaks to the shell, the leakage protector will also trip to avoid human touch and electric shock. At the same time, it has the functions of current interruption, overload protection and short circuit protection.
B. The working principle of leakage protection switch:
The power phase line and the neutral line pass through the round hole to become the primary coil of the zero sequence transformer. The rear outgoing line of the transformer is the protection range.
C. Function of earth leakage protection switch
(1) When leakage or ground fault occurs in electrical equipment or lines, the power supply can be cut off before people touch it.
(2) When the human body comes into contact with a charged object, the power supply can be cut off within 0.1s, thereby reducing the harm of current to the human body.
(3) It can prevent fire accidents caused by electric leakage.
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