Calculation report
2 per languageThe chaptered design report — engine sections, conclusions, assumptions and traceability — plus the configurator’s full design document: 2 files per language. Exported as HTML.
Open the report library →Electrical power system simulator
ElecSimHubDesign the scheme, run the studies, export the documents.
ElecSimHub is a free, no-sign-up browser workspace for LV/MV power-system design: draw a single-line topology, run the studies on the real engine, then export the drawings, the bill of materials and the design report. This site carries the simulator and its engineering calculators only — nothing leaves the browser until you press run.
The configurator opens with a worked example already loaded — switch between the industry scenarios, then bring that same scheme into the simulator.
Get a quotation — selection and pricing, straight through
Three entry points turn one saved scheme into something you can actually send: a recommended line list with prices, a stated price basis, and a bilingual tender package you hand over as one ZIP.
Selection → quotation
One engine run gives the recommended cable sections, the breaker Icw / Ir / Isd settings and the priced quotation lines — each recommendation cross-checked bit-for-bit against the selection checks. When no feasible configuration exists the page says so instead of rounding up.
Open the quotation page →Bid package — one ZIP
The drawing set (SVG + DXF), the calculation report, the quotation, the bill of materials with quantity statistics and the grid-code compliance checklist — Chinese and English, one complete set each, packed inside your own browser.
Open the bid package page →The price basis, written down
Equipment is priced from the engine price library. The page states the basis line, the currency and what is excluded, instead of letting a single number speak for itself.
Read the price basis →Prices come from the engine price library — this site does not print invented figures. Selection and quotation read a scheme you saved in the simulator or in the configurator; your workspace id stays in this browser for a year, no sign-up. Anything the price library cannot price stays marked as unpriced instead of being rounded.
- 7study groups
- 29workbench pages
- 17sub-tools
- 45capabilities ready
- Free · no account · results follow IEC / IEEE
Three tools, one workspace
They share one scheme: the topology the simulator runs, the configurator drafted and the deliverables package exports are the same object.
Simulator
Drag a single-line topology — grid, transformer, genset, PV, wind, BESS, UPS and loads — set the ratings and run the whole study set on your own scheme.
Open the simulator →Configurator
Choose source → distribution → secondary → special requirements. The engine validates, sizes and prices it, and drafts the single-line diagram and BOM with it.
Open the configurator →Deliverables
Turn the current scheme into schedules, drawings, an itemised bill of materials, a chaptered design report and a read-only link you can send.
Open deliverables →How it works — three steps
No sign-up. Nothing is sent anywhere until you press run, and a repeated run costs no second request.
- 01
Get a scheme
Start from an industry scenario in the configurator, or draw the topology yourself on the canvas and give the equipment its nameplate ratings.
- 02
Run the studies
Load flow, IEC 60909 short circuit, protection coordination, N-1, power quality, motor starting and economics — each study runs on the scheme you have open.
- 03
Export the package
Drawings (SVG / DXF), the bill of materials, protection and cable schedules, the chaptered report — plus a read-only link.
01 · What it computes
What the engine can compute — the full list
Every line below is a real workbench page, listed group by group from the same source as the left-hand directory. Nothing ready in the directory is missing here, and nothing here is unreachable from the directory.
- 45 capabilities ready
- 7 study groups
- 5 tools & entry points
- 1 in build
Design input
5 itemsScheme, versions, share, compare — the entry point every other study reads its scheme from.
- Configurator
Step-by-step design that produces the scheme with its product-level BOM and indicative price; the same scheme opens here as a canvas.
- Simulator
Drag-and-drop simulator: device library, wiring, live single-line diagram, run the engine and read results.
- Devices & ratings
Parameter panels for the 24 device types, the five-level source chain for every rating, and bulk entry.
- Shared viewsub-tool
Read-only snapshot opened from a signed link, with a visit counter.
- Scheme A/B comparesub-tool
Two schemes read side by side from a frozen A/B snapshot.
Core studies
5 itemsThe classic design studies: load flow and voltage, IEC 60909 short circuit, protection coordination, personnel and earthing safety, N-1 with load transfer.
- Load flow & voltage
Bus voltage and angle, branch flow, loading, voltage limits, losses, time-series and reactive-power cards.
- Short circuit & rating
Four fault types, per-bus Ik, peak ip / kappa / tau with decay curve, making and thermal withstand, max-min cases.
- Protection coordination
TCC curves, CTI ladder, selectivity and sensitivity, setting sheet, ZSI interlock, sequence protection.
- Personnel & earthing safety
Loop impedance Zs, touch and step voltage, earthing-grid GPR, arc flash (IEC 1584) and PPE.
- N-1 & transfer
Contingency one-by-one switching, SAIDI / SAIFI and automatic assessment of transfer options.
Power quality
5 itemsPower quality: harmonics and THD, resonance scan, volt / VAR optimisation, passive filter design.
- Power quality overview
One entry point over the whole power-quality picture: harmonics, flicker, unbalance and events.
- Harmonics & THD
Harmonic load flow on the nodal admittance, individual orders, THD, four-standard comparison and spectrum.
- Resonance scan
Full-spectrum |Z(f)| curve, resonance points, nearby harmonic hits and a risk grade (async scan).
- Volt-VAR optimisation
Capacitor steps, SVG and tap recommendation with before/after comparison.
- Filter & compensation design
Passive filter selection (C-type, second-order high-pass), THD before and after switching, resonance re-check.
Renewables & DC
5 itemsRenewables and DC: PV (shading, mismatch, LVRT, power quality), storage and DC networks, microgrid islanding, wind and hydrogen.
- Photovoltaic
Shading loss and hot spots, multi-MPPT mismatch, LVRT ride-through, PQ envelope and irradiance-temperature output.
- Storage & DC
DC load flow (Vdc, branches, losses), IEC 61660 DC short circuit, AC/DC coupling, BESS and charger clusters.
- Microgrid & islanding
Island steady state (Vf-PQ), diesel co-operation, automatic transfer, islanding protection settings and hosting capacity.
- Wind power
Wind steady state (PQ envelope, simplified LVRT) and wind-storage co-operation.
- Hydrogen
Electrolyser and fuel-cell time series inside the scheme.
Dynamics & time series
4 itemsDynamics and time: time-series and climate profiles, motor starting, transformer ageing, unbalanced load flow.
- Time-series simulation
Hourly load-flow slices, loss energy, reverse-flow hours, storage arbitrage and LCC.
- Motors & starting
Starting current, voltage dip and waveform, staggered starting and threshold alarms.
- Ageing & degradation
Transformer thermal ageing (hot-spot temperature and daily life loss) and short-circuit decay curves.
- Unbalance & open phase
Three-phase unbalance (neutral current, neutral shift, epsilon), single-phase open conductor and per-phase compensation.
Economics & delivery
6 itemsMoney and documents: loss allocation, economics and life-cycle cost, the drawing set with its title block, selection → quotation, and the one-shot bid package.
- Losses & allocation
Network losses and a per-device allocation table (iron, copper, line), shares and reconciliation.
- Economics
BOM, FOB quotation, LCC, EMS, demand, tariff, payback and CO2.
- Drawings
The complete sheet set in grid or single-sheet view, SVG/DXF export and a live single-line diagram.
- Title blocksub-tool
Customer title block on the drawing set: company, project name / number, date and logo, with SVG / DXF export.
- Selection → quotation
Turn one engine run into a recommended configuration and a quotable, priced line list cross-checked against the selection checks.
- Bid package
Package the drawing set, calculation report, quotation, BOM and grid-code compliance checklist into one bilingual ZIP.
Report library
15 itemsThe report library: one twenty-chapter report for the whole scheme, plus the single-subject reports below, each on its own page.
- 20-chapter report
Twenty-chapter calculation report with conclusions, assumptions and traceability, exported as HTML.
- Deliverablessub-tool
The deliverables desk: every output of this scheme in one place, shareable by signed link.
Tools & entry points
5 items1 entries are still in build
These directory entries have no page yet, so they are kept apart: not clickable, not counted as ready, and never mixed into the ready list above.
- Schemes & versionsin build
Scheme library, version chain (save / save-as), A/B pick and signed share links.
Coverage: every count on this page is read from nav-config (the same file the left-hand directory renders) when the page loads — no hand-written numbers, no second list to keep in sync.
02 · What it delivers
What ElecSimHub delivers
Every study above can leave the browser as a document. One button turns the scheme you have open into a single package — calculation report, drawing set, quotation, BOM with quantities, compliance checklists and an index — in English and Chinese, assembled in your browser, with no account and no checkout.
- 66files in one package
- 2languages in the same package
- 230 KBpackage size (ZIP)
- 2.7 sseconds to build, in the browser
Drawing set with title block
22 per languageEach sheet is exported twice, vector SVG and AutoCAD R12 DXF — 22 files per language. Every sheet carries a title block with project, drawing number, scale, date and the design / checked / approved signature boxes; company name, project data and logo are configurable.
Open the drawing set →Quotation
1 per language1 CSV per language: every item with model, specification, quantity, unit price and amount, plus the package total, priced against the copper-linked price baseline.
Selection → quotation →BOM and quantities
4 per language4 CSV per language: the itemised bill of materials without prices, plus the quantity tables the engine produces itself — summary, cables and devices.
Open the bid package →Compliance checklists
3 per language3 files per language: the grid-code checklist as CSV and HTML — clause by clause with pass / fail / na / unknown and the measured value against its limit — plus the configurator design-rule checks. A clause without data is never reported as pass: it is listed as unknown with the reason.
Open the bid package →Index and manifest
2 shared by both2 files shared by both languages: a README and a machine-readable manifest listing every entry with its byte size and its data source, and naming anything that could not be produced instead of writing an empty file.
Open the bid package →On the bid-package page, pick a scheme and press once: the package is assembled in your browser and downloaded as one ZIP, English and Chinese inside the same file.
Or work through the deliverables desk page by page — report, drawings, quotation, compliance — and create a read-only link you can send to a client.
Where these numbers come from
Measured on this build with a worked scheme on 2026-09-29: the one-shot export produced 66 entries in 2.7 s as a ZIP of about 230 KB (uncompressed content about 1 MB). The file count on each card is the package manifest’s own group count; anything that could not be produced is written into the package as an explicit “unavailable” note with its reason, never as an empty file.
What the engine actually solves
One engine, one model: every study below runs on the same topology and the same equipment ratings, so the numbers agree with each other.
- Load flow — per-node voltage, branch loading, losses and the limits that are violated.
- IEC 60909 short circuit — c-factors, κ peak factor, motor contribution and equipment withstand checks.
- Protection coordination — TCC curves, grading margins and the selectivity table.
- N-1 contingency — what happens when one source or one transformer drops out, and how the scheme restores.
- Power quality — harmonics / THD, resonance scan, detuned and passive filter design, volt / VAR optimisation.
- Safety — IEEE 1584 arc flash (incident energy, arc current) and touch / step voltage checks.
- Dynamics — motor starting, transformer ageing, unbalanced load flow and time-series / climate profiles.
- Renewables & DC — PV shading, wind, storage, DC networks and grid-tied / islanding transfer.
- Economics — loss allocation, life-cycle cost, payback and a copper-linked price baseline.
- Outputs — drawings, BOM, protection & cable schedules, I/O list and the chaptered design report.
Not sure where to start?
FAQ
What is free, which standards the studies follow, what the engine deliberately does not model, and how to export a package.
About
What ElecSimHub is, how the calculation works, and where its limits are stated rather than buried.
Contact
Send a scheme to an engineer, or ask for a formal quotation on a configuration.
Tech Hub
The transformer and power-engineering terminology the calculators and studies are written in.
Products & data sheetsOpen the product catalogue ↗