Create transfomer symbol consisting of two circles

Question

I am drawing a simple power system in a single line diagram and want to define a shape for a transformer, which looks like two partly overlapping circles. I have already defined styles for generators and impedances using \tikzset. By doing this I can easily draw generators and impedances using the node command. However, I haven't figured out how to do this for the transformer as it consists of two circles not one. Does anyone know an easy way to define this transformer shape, such that I can easily create one with the the node command?

Answer 1

A for loop is an answer for you here:

\documentclass{standalone}
\usepackage{tikz}
\begin{document}


    \tikzset{
        mycirc/.pic={
            \foreach \w in {0,1} {
                \draw (0,\w) circle (1cm);
            }
        }
    }

    \begin{tikzpicture}
    \pic at (2,2) {mycirc};
    \end{tikzpicture}
\end{document}

which will give you:

Even you can change the design choices of your transformers:

\documentclass{standalone}
\usepackage{tikz}
\begin{document}


    \tikzset{
        main/.style ={circle, inner sep=0pt, minimum size=0.6cm, dashed},
        mycirc/.pic={
            \foreach \w in {0,1} {
                \draw[main] (0,\w) circle (1cm);
            }
        }
    }

    \begin{tikzpicture}
    \pic at (2,2) {mycirc};
    \end{tikzpicture}
\end{document}

which will give you: