G 3PH SYNC
Three-phase synchronous generator
A three-phase synchronous generator supplies a documented AC source associated with its mechanical prime mover and excitation system.
SLD / Schematic
Symbols · SC
Synchronous condenser
An unloaded synchronous machine on the network that supplies reactive power, inertia and short-circuit strength.
In plain English
What does Synchronous condenser mean?
A synchronous condenser is a synchronous machine running without a prime mover, connected to the network to supply or absorb reactive power by adjusting its field current. Because it is a real rotating machine it also contributes inertia and high short-circuit current, which converter-dominated networks often lack.
A simple example
Single-line diagrams draw a synchronous machine circle labelled SC or with a capacitor-like note, connected through a step-up transformer and breaker, with a starting arrangement such as a pony motor or static frequency converter. A flywheel may be shown on the shaft to add inertia.
What the drawings help you do
The symbol looks like a generator but the machine exports no active power and draws a small amount to cover losses. It does not show the starting method, inertia constant or overexcitation limits, which define how much it helps during faults.
This particular reference
An unloaded synchronous machine on the network that supplies reactive power, inertia and short-circuit strength. A synchronous condenser exchanges only reactive power; a synchronous generator also delivers active power from a prime mover.
- 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.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: Synchronous Condenser System · Generator symbol variants
SLD · SC
What it represents
A synchronous condenser is a synchronous machine running without a prime mover, connected to the network to supply or absorb reactive power by adjusting its field current. Because it is a real rotating machine it also contributes inertia and high short-circuit current, which converter-dominated networks often lack.
Single-line diagrams draw a synchronous machine circle labelled SC or with a capacitor-like note, connected through a step-up transformer and breaker, with a starting arrangement such as a pony motor or static frequency converter. A flywheel may be shown on the shaft to add inertia.
The symbol looks like a generator but the machine exports no active power and draws a small amount to cover losses. It does not show the starting method, inertia constant or overexcitation limits, which define how much it helps during faults.
How to read it
- There is no prime mover; a pony motor or static starter is used only to bring the machine up to speed.
- Check for a flywheel added to raise inertia.
Information to show or reference
- State Mvar range, inertia and short-circuit contribution.
- Show transformer and starting method.
- Reference excitation limits.
A distinction that matters
A synchronous condenser exchanges only reactive power; a synchronous generator also delivers active power from a prime mover.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Synchronous Condenser System
Public synchronous condenser system page.
Generator symbol variants
Public synchronous machine symbol family context.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
Explore related references
STATCOM
Static synchronous compensator
A voltage-source converter in shunt that injects or absorbs reactive current to support voltage, independent of system voltage.
SLD
SFC
Static frequency converter
A rectifier and inverter in one unit that converts AC at one frequency to AC at another, such as 50 Hz to 60 Hz.
SLD
FESS
Flywheel energy storage
A rotating mass coupled to a motor-generator and converter that stores energy kinetically for short, high-power bursts.
SLD
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.