Low voltage switchgear is a common equipment in power system, which is used to control, protect and distribute electric energy. Its structure is complex, including various components and components, and its working principle is also complex. This article will introduce the structure and working principle of low-voltage switchgear to help readers better understand this important equipment.

1. Structure of low-voltage switchgear

the structure of low-voltage switchgear usually includes the following parts:

• power input part: including the main circuit breaker and power monitoring device, used to access the power supply and monitor the power situation;
• control part: including controllers, contactors, buttons, etc., used to control and adjust the circuit;
• protection part: including fuse, overload protector, etc., used to protect the circuit safety;
• bus part: used to transmit electric energy and connect various equipment and units.

The above parts are connected by connecting wires and control signals to form a complete low-voltage switchgear system.

2. Working principle of low voltage switch cabinet

the working principle of low-voltage switchgear involves the control, protection and distribution of circuits. Its basic working principle is as follows:

• switch control: through the controller to control the contactor or circuit breaker, to achieve the circuit on and off;
• protection function: fuse and overload protector realize overload and short circuit protection of the circuit by monitoring the current size;
• distribution function: the bus introduces the electric energy into the switch cabinet and distributes it to each equipment and unit to realize the transmission and distribution of electric energy.

In the working process, the controller receives the control signal, controls the on-off and protection of the equipment, and ensures the normal operation and safety of the circuit.

3. Work flow of low voltage switchgear

low-voltage switchgear the workflow typically includes the following steps:

• power connection: the main circuit breaker is connected to the power supply, and the power monitoring device detects the power condition;
• control signal transmission: the controller receives the control signal and controls the on-off of the contactor or the circuit breaker;
• electric energy distribution: the bus distributes electric energy to various equipment and units to realize the transmission and distribution of electric energy;
• protection function: the fuse and overload protector monitor the current to realize the overload and short circuit protection of the circuit.

In the whole workflow, all parts cooperate with each other to ensure the normal operation and safety of the circuit.

4. Working Examples

when a low-voltage switchgear is working, the controller opens the contactor after receiving the control signal to energize the circuit; at the same time, the fuse and overload protector monitor the current, and immediately cut off the circuit in case of overload or short circuit, so as to realize the protection of the circuit. The bus distributes electrical energy to each device and unit to ensure the normal operation of the entire circuit.