In high voltage and high current application scenarios, Fixed Switch Cabinet needs to have a series of special designs to ensure safe and reliable operation.
First of all, insulation performance is a crucial design point. Use high-performance insulating materials, such as high-quality insulating resins, ceramic insulators, etc., to increase the insulation distance between phases and to the ground to withstand the impact of high voltage and prevent leakage and short-circuit accidents. At the same time, the electric field distribution inside the switch cabinet is carefully designed and optimized to reduce the electric field concentration phenomenon and reduce the risk of partial discharge.
For the carrying capacity of large currents, the busbars and conductors in the switch cabinet need to have sufficient cross-sectional area and good conductivity. Usually, large-section conductive materials such as copper or aluminum bars are selected, and through reasonable layout and connection methods, resistance and reactance are reduced, and heat generation and energy loss are reduced.
Heat dissipation design is also one of the keys. High voltage and high current will generate a lot of heat, so an effective heat dissipation system is required. Forced air cooling or water cooling may be used to ensure that the temperature in the switch cabinet remains within a safe range to prevent equipment damage due to overheating.
In the selection of switch components, circuit breakers and contactors that can withstand high voltage and high current need to be used. These switch components must have good arc extinguishing performance, be able to quickly and safely cut off the circuit, and avoid damage caused by continuous burning of the arc.
The structural strength of the switch cabinet also needs to be strengthened. To withstand the huge electric power and impact force generated by the short-circuit current, prevent the cabinet from being deformed or damaged. Structural reinforcement measures such as thickened steel plates and reinforcing ribs are used to improve the mechanical stability of the switch cabinet.
In addition, in order to ensure the measurement and protection accuracy under high voltage and high current conditions, high-precision transformers, sensors and relay protection devices are required. These devices can accurately monitor parameters such as voltage, current, and power, and issue alarms or trip signals in time under abnormal conditions to protect the safety of equipment and power grids.
At the same time, the protection level of the switch cabinet must also be considered. In high voltage and high current environments, better protection is needed to prevent the intrusion of external factors such as dust and water vapor to ensure the normal operation of the equipment.
In large substations, Fixed Switch Cabinet needs to face continuous operation of high voltage and high current. By adopting the above special designs, such as high-performance insulation materials, large-section conductive busbars, efficient heat dissipation systems, powerful switching elements and precise measurement and protection devices, the switch cabinet can be ensured to work stably under complex and harsh operating conditions, providing strong guarantees for the safe and reliable power supply of the power system.
In summary, for high-voltage and high-current application scenarios, the Fixed Switch Cabinet needs to be specially designed in terms of insulation, conductivity, heat dissipation, structural strength, measurement protection and protection to meet special operating requirements.
