1. Selection principle of medium-voltage switchgear: According to the characteristics of power load, select the appropriate medium-voltage switchgear to ensure the reliability and stability of the equipment.

2. Technical parameters of medium-voltage switchgear: including rated voltage, rated current, rated short-time withstand current, rated short-time withstand time and other parameters.

3. Installation environment requirements of medium-voltage switchgear: including installation location, installation conditions, protection level and other requirements.

The medium and low voltage switchgear is configured according to the application system scheme, such as incoming line, outgoing line, bus connection, reactive power compensation, motor starting, grounding transformer, etc.