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ZeroRiskk SLD Studio combines electrical single-line-diagram authoring with balanced AC load-flow analysis and IEC 60909-0:2026 Edition 3 short-circuit studies. The same project topology and equipment data are used to move from drawing the network to operating-condition and fault-duty calculations.

Yes. Load Flow and Short Circuit are study modes of the same SLD project. You model the network once, set the applicable operating and short-circuit data, validate study readiness, and run the required study without rebuilding the system in a separate drawing.

The current model includes grid sources, synchronous and induction generators, converter sources, synchronous and induction motors, static loads, two-winding and three-winding transformers, autotransformers, earthing transformers, busbars, cables, overhead lines, conductors, series and shunt reactors, capacitor banks, circuit breakers, disconnectors, fuses, contactors, reclosers, neutral grounding resistors, CTs, VTs, CVTs, CBCTs, neutral CTs, earth points and protection IED symbols. Study participation depends on the engineering parameters relevant to each equipment type.

Yes. The SLD can contain multiple voltage levels connected through transformers and autotransformers. Study results retain the applicable terminal and winding voltage bases instead of treating the whole project as a single-voltage network.

Load Flow uses a balanced positive-sequence AC Newton-Raphson model. The implemented model includes fixed transformer taps, shunts, voltage-dependent loads, electrical islands and generator reactive-power limits.

The Load Flow workspace provides bus voltage magnitude and angle, solved source and load power, branch-terminal currents and current angles where defined, power factor, equipment loading and rating assessment, power balance, series losses, voltage profile, operating findings and de-energized or indeterminate states where applicable. Missing ratings are kept separate from a within-rating result.

Yes. A calculated Load Flow run can be pinned as a session baseline and compared with a later run after changing the operating case, topology or engineering inputs. The comparison can show changes in voltage, loading, series losses and new or resolved findings.

The Short Circuit study implements IEC 60909-0:2026 Edition 3 calculation workflows for the supported network models and study inputs. Results should be used with verified source, sequence, grounding, topology and equipment-rating data; the software output is an engineering calculation result, not a conformity certificate.

The current Short Circuit workspace supports three-phase faults, phase-to-phase faults, single-phase-to-earth faults and double-phase-to-earth faults. Earth-fault calculations require the applicable sequence-network, transformer connection and grounding data.

Yes. The study supports maximum and minimum fault cases with the applicable IEC voltage-factor and source-case treatment. The selected study assumptions are retained with the result so the calculated duty can be interpreted on the correct basis.

Yes. All-bus short-circuit results can retain bus-indexed source decomposition so the combined bus fault current can be reviewed separately from individual grid, generator, motor and converter contributions. Focused-fault results can also show directional physical-path currents where the network current can be reconstructed unambiguously.

Yes. Where the required ratings and current basis are available, the study can compare calculated short-circuit duty with configured interrupting-device ratings. Bus prospective fault current, source contribution, branch current and device through-current are kept as different result quantities rather than being treated as interchangeable.

Yes. The project model includes transformer connection/vector-group data and winding grounding inputs used by the sequence-network calculation. Two-winding transformers, three-winding transformers and autotransformers have study fields for their applicable connection and grounding arrangements.

Yes. For a selected fault, ZeroRiskk can display the calculated initial fault-voltage result when the pre-fault operating model is available. Three-phase faults show a balanced voltage magnitude, while unbalanced faults can show phase quantities. These are fault-condition RMS estimates associated with the selected fault and are not a transient voltage-recovery or dynamic ride-through simulation.

The results do not automatically treat missing data as a passing condition. Missing continuous or short-circuit ratings remain unassessed, and ambiguous current sharing through ideal parallel paths can remain indeterminate instead of assigning an arbitrary current split.

Yes. ZeroRiskk SLD Studio includes engineering export paths for the single-line diagram and study results, including SVG/PDF diagram output and supported PDF/CSV study-report or schedule exports. Exported values retain the study result basis rather than converting unavailable quantities to zero.