One-line diagram

A single phase diagram is a form of circuit diagram, which takes place primarily in the area of ​​electrical power engineering application. An essential feature is that which is necessary for a circuit electrical conductors are not shown separately, but are schematically depicted by a single common bond line. This style and their symbols are in the DIN standard 40900 part 6, switching characters for the production and conversion elec. Energy normalized.


Einliniendiagramme serve to illustrate clearly electrical installations such as power stations or electrical power distribution networks. Depending on requirements and application and voltage or power flow shall be entered in the chart next to the normalized circuit symbols for transformers, circuit breakers, generators or inverters. In power plants, the essential loads such as pumps are shown, but further details are lacking.

In the adjacent figure, the single phase diagram of a block is from a coal power plant. In it, each voltage level on its own color. Links to the main generator is shown with separate excitation, the top left of the machine transformer for direct energiser in the high voltage network. During operation, the power plant supplied directly from the main generator using the above centric shown auxiliary transformer which two, redundant design 10 kV busbars fed. The guidance and control technology, various pumps and electric filter is fed from the own requirements. To protect against failures various emergency power supplies are provided. The power plant unit shown is not black bootable and needs for starting the top right drawn externally supplied 110 kV energiser.

The type of abstraction and the restriction of these diagrams on the essentials is comparable to the R & I diagrams in chemical engineering.