1. Coil arrangement:

Step down transformer: the low-voltage core is located in the middle, and the high-voltage is located outside.

Transformer: medium voltage is on the iron core, low voltage is in the middle and high voltage is outside.

2. The capacity distribution of each coil is different:

Step down transformer: high voltage 100%, medium voltage 100%, low voltage 50, or: high voltage 100%, medium voltage 50%, low voltage 100%;

Step up transformer: high voltage 100%, medium voltage 50%, low voltage 100%;

3. Due to different coil arrangement, the impedance between high, medium and low voltage is different.

Step down transformer: high and medium grade 12-14%, high and low grade 22-24%, medium and low grade 7-9%

Step up transformer: high medium 22-24%, high low 12-14%, medium low 7-9%

Extended data

The configuration of step-down transformer protection shall be such that under no circumstances can the transformer be burned, which will expand the accident and affect the stability of the power system. Its working principle, relay protection principle, operating conditions, operation and requirements, abnormal operation and handling methods are introduced in detail.

Basic principle:

It is the principle of electromagnetic induction. Now, the basic working principle of single-phase double winding transformer is illustrated by taking the single-phase double winding transformer as an example: when voltage is applied to the primary side winding, the current flowing through the iron core will generate alternating magnetic flux. These magnetic fluxes are called the main magnetic flux, and the main magnetic flux will pass through. The primary and secondary windings will generate induced electromotive force in the winding. At this time, if the secondary side is connected to the load, there will be current flowing out to generate electric energy.

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