In a system (an electrical or hydrological installation, for example), a single-line diagram or single-line diagram is a simplified graphic representation of flows and/or relationships between the elements of that system.

Contenido

La siguiente es una relación no exhaustiva de elementos gráficos que se suelen encontrar en un esquema unifilar.

Hydrology and hydrography

It is used in hydrology and hydrography to represent water flows, whether terrestrial (hydrography) or in the environment (hydrology).[1]​.

Electrical installation

The single-wire diagram of an electrical installation is distinguished from other types of electrical diagrams in that the set of conductors in a circuit is represented by a single line, regardless of the number of said conductors.[2] Generally, the single-wire diagram has a tree structure "Tree (data structure)"), although only.

All the components found inside the same electrical panel are represented inside a polygon (probably a rectangle). This polygon represents the electrical panel and is usually drawn with a dashed line. In addition, it is convenient that a label identifies which table each polygon refers to by means of a technical label in the lower right margin.

A circuit is a branch of the single-line diagram with two ends. The upper end can be the beginning of the single-wire scheme or be connected to another upstream circuit. The lower end may be connected to one or more circuits, or to a receiver.

The number of conductors in a circuit is represented by oblique lines, parallel to each other, that are drawn on the line. Only the active conductors are represented (not the ground conductor), so it is common to find two, three or four traces, for single-phase, three-phase without neutral and three-phase with neutral circuits, respectively.

Next to each branch, the characteristics of the conductor are indicated, such as number of conductors, section, material, insulation, channeling, etc.