What symbol in transformer ratings denotes multiple windings?

The symbol that denotes multiple windings in transformer ratings is the "Times" (x) symbol. This notation is crucial for conveying the configuration of the transformer, especially when specifying how many individual windings are present and how they relate to each other in terms of voltage and phase relationships.

In practice, when a transformer is specified with a rating such as "10 x 5," it means that the transformer has two windings: one with a voltage rating of 10 kV and another with a voltage rating of 5 kV. This representation helps linemen and engineers quickly identify the winding ratios and understand the electrical characteristics of the transformer, which is essential for installation, maintenance, and troubleshooting.

The other symbols mentioned serve different purposes in electrical notation. For instance, the slant indicates a division or the connection of different types of systems or configurations, while a hyphen typically signifies a range or a relationship rather than indicating multiple windings. Letters are often used to represent specific characteristics or designations rather than the presence of multiple windings. Therefore, the use of the "Times" symbol is specifically reserved for indicating multiple windings in transformer ratings.