Drawings

This page turns a scheme into a drawing set that can be handed to a client or a design institute. The live single-line diagram is drawn from the scheme topology as vector geometry and can be exported straight away. The full engineering set is produced by the drawing engine of the configurator for the same scheme: design basis, symbol legend, single-line diagram, system topology, MV and LV distribution, short-circuit calculation, applicable standards, main equipment data, construction and test requirements, power quality, SCADA architecture, protection configuration, the time-current coordination curve, earthing system, lightning and surge protection, equipment layout, reactive compensation, microgrid changeover, secondary control schematics, terminal strips, panel layout, DC auxiliary system and the diesel and storage peak-shaving sheets — typically around 26 sheets, and more when the scheme has more subsystems. Every sheet carries a title block with project, drawing number, scale and date, device symbols with tags, circuit numbers, dimensions, a legend and the watermark, and each sheet exports to SVG or DXF with the whole set packable into one zip. The reference standards are the IEC 61082 series for document preparation, IEC 60617 for symbols, IEC 61346 / IEC 81346 for reference designation and IEC 61082-1 title-block practice, with DXF output as AutoCAD R12.

Drawings are the language of delivery and construction: a scheme that cannot be drawn cannot be built, quoted or approved. The set is what the client checks for completeness, what the design institute deepens into construction drawings, and what the installation team works from. Being able to export vector SVG and DXF means the sheets can be re-edited rather than redrawn, which is the difference between a presentation and a working document — and each sheet being generated from the same scheme configuration as the calculations is what keeps the drawing and the numbers from drifting apart.

Input: the scheme configuration (design basis with total kW, circuit count, diversity factor and largest motor; the power sources with their voltage levels; MV switchgear; transformer type and redundancy; LV switchgear; special conditions) together with the device tags and ratings restored from the configurator, the cable specification and length, and the protection, earthing and reactive settings carried on the sheets → chain: the topology and the selection results are walked to produce the vector geometry of every sheet — title block, symbols, tags, circuit numbers, dimensions and legend — and the thumbnail grid renders the first twelve sheets immediately with the rest drawn on request so that the first paint is not blocked → each sheet is exported to vector SVG or converted to DXF R12 locally in the browser with layers split by stroke colour, and the whole set can be packed into a single zip of DXF files → output: the sheet grid with on-demand thumbnails, the single-sheet view, the live single-line diagram and the SVG / DXF / zip exports. Linkage: the circuit count and the devices decide how many sheets exist and what is on them, so adding a subsystem adds its sheets; the cable specification and length become the tags and dimension text; the protection, earthing, surge and compensation settings are printed on their own sheets; and the short-circuit result is what the short-circuit sheet reports, so a rating change moves both the calculation and the drawing. Approximations and limits, all disclosed: the sheets are scheme-level documents that show the topology, ratings and circuits derived from the input, and construction drawings still have to be deepened by a licensed design institute — that statement is printed on the set itself; thumbnails are rendered on demand but the file content is identical either way.

A 2000 kW / 0.85 pf scheme with a 10 kV incomer, MV switchgear, one 2000 kVA transformer, LV switchgear, 8 outgoing circuits, 480 kWp PV and a 3000 kW storage system returns 31 sheets in this configuration (a 600 kW single-circuit scheme returns 7 sheets drawn on the same pattern). Each sheet is a standalone SVG: the single-line sheet alone is around 20 kB of vector geometry, the terminal-strip sheet around 28 kB. Exporting the whole set to DXF produces one file per sheet in a single .zip.

The drawing set follows the IEC 61082 series (preparation of documents used in electrotechnology), IEC 60617 (graphical symbols for diagrams), IEC 61346 / IEC 81346 (reference designation) and IEC 61082-1 title-block practice; DXF output is AutoCAD R12 / AC1009. Drawings are scheme-level documents: they show the topology, ratings and circuits derived from your input, and construction drawings still need deepening by a licensed design institute (this disclosure is printed on the drawing set itself).

How many drawings does the set contain?

Typically 26 sheets for a standard commercial or industrial scheme, and it grows with the scheme: this test scheme with a 10 kV incomer, one transformer, 8 outgoing circuits, PV and storage returns 31 sheets, while a minimal 600 kW single-transformer scheme returns 7. The sheet list is driven entirely by the scheme configuration, so adding a subsystem adds its sheets.

What can I do with the exported files?

Each sheet exports as a vector SVG (scales without loss and can be re-edited in Inkscape / Illustrator) or as DXF R12 (opens in AutoCAD, ZWCAD, LibreCAD and DWG TrueView with layers split by stroke colour; non-ASCII text is escaped as \U+XXXX). The .zip button converts every sheet at once, so you get a complete CAD-ready drawing set without touching a server.

Why are thumbnails rendered on demand?

A complete set is a few hundred kilobytes of vector geometry, and drawing all of it at once would stall the first paint. The grid therefore lists every sheet immediately but only renders the first twelve thumbnails, drawing the rest when you press “Render all sheets” or open a single sheet — the file contents are the same either way.