What functional cabinets does a complete set of switch cabinets have and what are the factors for selecting switch cabinets?

The function of the incoming cabinet is to receive the power input from the upper power source (such as transformer or main busbar). It is equipped with vacuum circuit breakers, disconnectors, current transformers, voltage transformers, etc., which are used to distribute power and have protection, metering, monitoring and other functions; the function of the outgoing cabinet is to distribute power to the lower load (such as transformer, motor or distribution equipment). It is similar to the incoming cabinet, but the current level may be lower. It is equipped with disconnectors, circuit breakers, knife switches, live display devices, etc., mainly used to distribute power and provide overcurrent and overload protection; the function of the busbar is to connect two sections of the busbar to realize dual power switching or busbar segmented operation. It is equipped with busbar circuit breakers and disconnectors for system redundancy or fault isolation; the function of the isolation cabinet is to isolate the circuit during maintenance to ensure safe operation. It is equipped with disconnectors or isolation carts, no circuit breakers, and only provides physical isolation. The metering cabinet is to install an energy meter to record the power consumption as the basis for the settlement between the power supply company and the user. The function of the PT cabinet is to install a voltage transformer, monitor the busbar voltage, and provide voltage signals to the protection device and instrument. Capacitor cabinets are used for reactive power compensation, improving power factor and reducing line losses.

These functional cabinets together constitute a complete switch cabinet system, which is responsible for the distribution, control and protection of electric energy and ensures the stable operation of the power system. So how to choose these functional cabinets?

When selecting Switchgear and functional cabinets, we need to consider the following key factors to ensure that the selected switchgear can meet the specific needs of the project and operate stably in the long term. The first is the current capacity and voltage level and related technical parameters. The current capacity and voltage level of the switchgear are selected according to the required load current and power supply voltage. This is the basic decision for selecting the switchgear, which directly affects the functionality and safety of the switchgear.

The second is function and configuration. Select the function and configuration of the switchgear according to your electrical system requirements. For example, do you need circuit breakers, contactors, current transformers, protection devices, etc. The configuration of these functional units will determine the performance and degree of automation of the switchgear. There is also the requirement for the use environment. Consider the environmental conditions where the switchgear will be installed, such as the surrounding air temperature, relative humidity, altitude, earthquake intensity, indoor or outdoor, whether there is a corrosive environment, etc., and select the switchgear that meets the corresponding environmental specifications and requirements to ensure the reliable operation of the equipment.

In addition, there are also considerations of reliability and safety, cost-effectiveness and regulatory standards. Choosing a switchgear with good reliability and safety requires checking the supplier's qualifications and brand reputation to ensure that high-quality switchgear is selected.

Choose switchgear based on budget and performance requirements. Compare the prices and features of switchgear of different brands and models, and choose the most cost-effective option. Make sure that the selected switchgear complies with the electrical regulations and standards of relevant countries and regions, such as GB, DL, IEC and other relevant standards. By comprehensively considering the above factors, you can choose the switchgear and functional cabinet that best suits your project needs, thereby ensuring the safe, stable and efficient operation of the electrical system. The above is an introduction to some functional cabinets of switchgear, as well as some factors to consider when choosing switchgear.