# Fixed-speed wind turbine generator (Type 1) Canonical URL: https://eloragrid.ai/symbols/type-1-fixed-speed-wind-turbine-generator Publisher: Elora Grid Updated: 2026-10-28 Lookup label: WTG T1 Drawing use: SLD Reference families: IEC, IEEE / ANSI A wind turbine whose squirrel-cage induction generator connects to the network directly, running at nearly constant speed. ## In plain English ### What does Fixed-speed wind turbine generator (Type 1) mean? This symbol marks a Type 1 wind turbine: a rotor-driven squirrel-cage induction generator whose stator connects to the collector network through a soft starter and a step-up transformer, with no power converter in the main path. Speed varies only by the generator slip, typically one or two per cent, so the turbine is described as fixed-speed. ### A simple example On a single-line diagram it is usually drawn as a blade or rotor glyph coupled to a generator circle marked for an induction machine, followed by the soft starter, switched capacitor steps for reactive power and the pad-mount or nacelle transformer. Older wind farms and small community turbines are the main places it still appears. ### What the drawings help you do The symbol does not state the reactive demand of the generator, the capacitor step sizes or how the turbine behaves during voltage dips. Those values come from the turbine data sheet and the grid connection study, because an induction generator draws magnetising current from the network rather than supplying it. ### This particular reference A wind turbine whose squirrel-cage induction generator connects to the network directly, running at nearly constant speed. A Type 1 turbine has no converter in the power path; a Type 3 or Type 4 turbine shows a converter that sets speed and reactive output. ### Terms - Winding: A coil of conductor inside an electrical machine or transformer. - Normally open / normally closed: The contact state in the normal condition defined for the drawing. - Terminal: An identified point where a conductor connects. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [AutoCAD Electrical: Power station and substation concepts](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-74EF80E8-018D-4A57-88BD-FF973F1B8185.htm) - [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) ## What it represents This symbol marks a Type 1 wind turbine: a rotor-driven squirrel-cage induction generator whose stator connects to the collector network through a soft starter and a step-up transformer, with no power converter in the main path. Speed varies only by the generator slip, typically one or two per cent, so the turbine is described as fixed-speed. On a single-line diagram it is usually drawn as a blade or rotor glyph coupled to a generator circle marked for an induction machine, followed by the soft starter, switched capacitor steps for reactive power and the pad-mount or nacelle transformer. Older wind farms and small community turbines are the main places it still appears. The symbol does not state the reactive demand of the generator, the capacitor step sizes or how the turbine behaves during voltage dips. Those values come from the turbine data sheet and the grid connection study, because an induction generator draws magnetising current from the network rather than supplying it. ## How to read it - Look for shunt capacitor steps beside the generator; they supply the reactive power the induction machine absorbs. - A soft starter or thyristor bypass shown in series is for connection inrush only, not for speed control. ## Information to show or reference - State generator rating, voltage and slip range. - Show soft starter and capacitor compensation steps. - Reference the turbine step-up transformer and collector feeder. ## Important distinction A Type 1 turbine has no converter in the power path; a Type 3 or Type 4 turbine shows a converter that sets speed and reactive output. ## Facts - Generator type: Squirrel-cage induction - Speed range: Near fixed, set by slip - Reactive power: Absorbed; compensated by capacitors - Preview: Independent educational illustration; consult the applicable standard and project legend for the exact graphic ## Public references - [AutoCAD Electrical: Power station and substation concepts](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-74EF80E8-018D-4A57-88BD-FF973F1B8185.htm) — Autodesk. Public wind generating station representation used as the site-level context for turbine symbols. - [IEEE/ANSI 315-1975: graphic symbols for electrical and electronics diagrams](https://standards.ieee.org/ieee/315/515/) — IEEE Standards Association. Graphic-symbol standards context for rotating machines; no reproduced artwork. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.