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What is the sequence for powering down the transformer?

Rockwell

07/26/2025

The sequence for shutting down a main transformer is as follows: when de-energizing, the load side should be shut down first, followed by the power supply side. For energizing operations, the reverse order applies: the power supply side is energized first, then the load side. This is because:

Energizing from the power supply side to the load side makes it easier to identify the fault range and take prompt judgment and handling measures in case of a fault, preventing the fault from spreading or expanding.
In multi-power supply scenarios, shutting down the load side first can prevent reverse charging of the transformer. If the power supply side is shut down first, a fault may cause protection devices to malfunction or fail to operate, prolonging the fault clearance time and potentially expanding the fault scope.
When the load-side bus voltage transformer is equipped with an under-frequency load-shedding device without current blocking, shutting down the power supply side switch first may trigger false operation of the under-frequency load-shedding device due to feedback from large synchronous motors.

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Machines Transformer Electric transformer

Rockwell

Wenzhou Rockwell Transformer Co., Ltd. It is a high - tech enterprise integrating R & D, production, sales, and service. It focuses on the manufacturing of power transformers and supporting equipment, and is committed to providing efficient, reliable, and energy - saving power transmission and distribution solutions for global customers. We can offer: •Distribution transformers and substations •Outdoor switchgears and breakers(recloser) •Switchgears and it’s components (GIS, RMU, VCB, SF6 CB) Market and Service: We always take customers as the orientation and provide customized services according to their requirements. Our products are exported to the Middle East, Africa, Northern Europe, South America, and many other countries and regions. Drive the future of electricity with technological innovation and become a leading global supplier of intelligent power equipment.

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