The neutral point grounding resistor cabinet is an indispensable component of the 6~35KV AC power grid in my country’s power system. It solves various grounding methods, including ungrounded, grounded through arc suppression coils, high resistance grounding, low resistance grounding, etc. In urban power supply systems dominated by cable transmission lines, the grounding capacitance current may be very large. This situation will produce specific “critical” conditions, which may cause intermittent arc grounding overvoltages, thereby generating arcs. The submerged arc furnace transformer plays an important role in mitigating these risks with its rugged design and grounding capabilities.
To address the challenges posed by ground overvoltage, a neutral point resistance grounding method is used. This method establishes a discharge path for the energy (charge) in the grid grounding capacitance. By injecting resistive current into the fault point, the ground fault current exhibits both resistive and capacitive characteristics. This innovative method reduces the phase angle difference with the voltage, thereby minimizing the re-ignition rate of the fault point current after zero crossing. Submerged arc furnace transformers are designed to operate effectively under these conditions, ensuring that the grounding system remains stable and reliable.
A key advantage of using a SAF transformer is its ability to limit overvoltage to less than 2.6 times the phase voltage. This feature is critical to protecting sensitive equipment and maintaining the integrity of the power system. Highly sensitive ground fault protection integrated within the transformer accurately detects and isolates primary and secondary faults in the feeder. This proactive approach not only safeguards the normal operation of the system, but also improves the overall efficiency of the SAF process.
SAF transformers are an indispensable asset in modern power systems, especially in urban environments where grounding issues are prevalent. Their advanced design, coupled with neutral grounding resistor cabinets, ensures that ground overvoltages are effectively managed. By limiting overvoltages and facilitating accurate fault detection, these transformers play a key role in maintaining the stability and reliability of the power grid. As the industry continues to grow, the importance of such specialized transformers will only grow, making them an essential component of future power system management.
Post time: Nov-21-2024