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Why the transformer is needed to be operated in parallel ?

Operating transformers in parallel offers several advantages, primarily related to increasing overall system capacity, improving reliability, and providing flexibility in power distribution. The decision to operate transformers in parallel is driven by factors such as load demand, system redundancy, and efficiency considerations. Below are detailed explanations of why transformers are operated in parallel:

  1. Increased Power Capacity:
    • Operating transformers in parallel allows for the combined capacity of multiple units to be utilized. This is particularly beneficial in situations where the power demand exceeds the capacity of a single transformer. By adding transformers in parallel, the total power capacity of the system increases, ensuring that it can meet the growing or fluctuating load demand.
  2. Redundancy and Reliability:
    • Parallel operation enhances system reliability by providing redundancy. If one transformer experiences a failure or needs maintenance, the remaining transformers can continue to supply power, reducing the risk of downtime. This redundancy is crucial in critical applications such as industrial processes, hospitals, and data centers where uninterrupted power is essential.
  3. Load Sharing:
    • Transformers in parallel can share the total load, ensuring a more balanced distribution of power. The load sharing capability helps prevent overloading of individual transformers, optimizing their performance and extending their lifespan. It also facilitates efficient utilization of the entire transformer bank, reducing the likelihood of premature failure due to uneven loading.
  4. Flexibility in Maintenance:
    • Operating transformers in parallel provides flexibility in maintenance scheduling. If one transformer requires maintenance or repair, it can be taken offline without disrupting the entire power supply. The remaining transformers can temporarily handle the load, maintaining continuity of power while maintenance activities are carried out.
  5. Improved Efficiency:
    • Transformers in parallel can operate more efficiently at partial loads compared to a single large transformer operating at a fraction of its capacity. This is because smaller transformers generally have better efficiency characteristics at lower loads. Operating multiple transformers in parallel allows the system to adapt to varying load conditions, improving overall efficiency.
  6. Voltage Regulation:
    • Parallel operation of transformers aids in voltage regulation. Transformers can be designed and configured to automatically adjust their output voltage based on the load. When transformers are operated in parallel, they collectively contribute to maintaining a stable voltage profile across the system, ensuring that the voltage at the load remains within specified limits.
  7. Economic Considerations:
    • Parallel operation is often more cost-effective than investing in a single, larger transformer. Smaller transformers can be more readily available and may have a lower upfront cost. This modularity in design and construction allows for easier expansion and upgrades as the power system evolves.

In summary, the decision to operate transformers in parallel is driven by the need for increased capacity, enhanced reliability, load sharing, maintenance flexibility, improved efficiency, voltage regulation, and economic considerations. This approach optimizes the performance of the power distribution system, ensuring a robust and adaptable infrastructure to meet varying load demands and operational requirements.

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