Current transformers costs

[m.s.j]

In an industrial project, the customer decided to change first order for new power transformer. According to new order, the rating power of transformer should be half. He enquired new detail cost table and transformer manufacturer submitted it. Future power transformer user cheeked that mentioned list; he noted all detail items cost decreased approximately except bushing current transformers costs. He can not understand the reason of this cost impact.

How can you explain the reason of BCT cost increasing due to its turn ratio decreasing?


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[dlgoff]

Wouldn't you need twice the number of turns for half the current from the new power transformer? If not your ct output would not be correct for the existing instruments.

 

[oswaler]

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The reason for the increase in bushing current transformer (BCT) costs is due to its turn ratio decreasing. This means that the transformer is now designed to handle a lower amount of current, which requires more turns in the coil to achieve the desired transformation ratio. This increase in turns means that more material and labor are required to manufacture the BCT, resulting in a higher cost. Additionally, the new transformer may also require a different core size or material, further contributing to the increase in cost. It is important for the customer to carefully consider all aspects of the transformer design when making changes to the order, as even small changes can have a significant impact on the overall cost.