Detailed Guidelines for the Operating Key Points of Transformer Core Laminations

Operating Key Points of Transformer Core Laminations — Do We All Understand Them?

Probably not everyone knows, which is why this article was written — specifically to introduce this area of knowledge, enabling us to study with focus and purpose so that we can better utilize cores and transformers. The specific content is as follows.

The main operating key points for transformer core laminations are as follows:

(1) Have a thorough understanding of the drawings and quality requirements, prepare all necessary materials and tools required for operation, and conduct quality inspection of the laminations, removing any that do not meet quality standards.

(2) The parallelism of the upper and lower clamps and the diagonal measurement deviation shall be controlled within 1 mm.

(3) During core stacking, generally two sheets are stacked at a time, with the center limb sheet added. The sequence is "center, left, right," completing one cycle every three layers. After completing each step, a self-inspection should be performed. If the thickness exceeds 15 mm, shaping should be carried out to meet the specified requirements.

(4) If the core laminations vary in thickness, they should be separated and placed on top of the core limbs at each step to prevent any impact on the core limbs. Occasionally, three sheets may be stacked together, but adequate clearance must be maintained.

(5) For the top and bottom cover sheets of each step, those of better quality should be selected. When stacking the last three steps, temporary core clamping should be installed to facilitate tightening.

(6) Feet spacers/blocks should be manufactured using dried hardwood. If the dimensions are not suitable, they may be trimmed to ensure tight contact with the lower yoke end face of the core.

(7) When clamping the core, start from the center and work towards both ends.

(8) The core body should be blown clean with compressed air, then coated with paint, but care must be taken not to paint the upper yoke.

(9) Unpainted areas should be coated with anti-rust oil for protection.

(10) Laminations should be handled gently — no dropping or impact, and certainly no stepping on them, to avoid damaging the laminations.

(11) The staggered joints of the laminations should be kept uniform and consistent.

(12) After the core lamination stack is completed, testing should be performed. Those passing the test should be tagged with a "qualified" label, and those failing should be tagged with a "non-qualified" label to avoid confusion.

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