About ElecSimHub
ElecSimHub is a free, no-sign-up browser tool set for LV/MV power-system design: you draw a single-line scheme and the calculation engine returns real load flow, IEC 60909 short-circuit results, equipment withstand checks, harmonics and resonance, protection coordination, a drawing set, an economics case and a chaptered design report. It is built for electrical engineers, EPC contractors, design institutes and owners doing feasibility-level comparison and quick verification.
ElecSimHub 是面向中低压电力系统设计的免费在线工具组，无需注册：画出单线方案，计算引擎返回真潮流、IEC 60909 短路、设备耐受校核、谐波与谐振、保护配合、成套图纸、经济性与分章计算书。面向电气工程师、EPC、设计院与业主，用于可研级方案比选与快速验证。
What it is
Four things work together: a drag-and-drop simulator/design canvas, the engineering calculators inside the product catalogue, a deliverables workspace that turns a scheme into documents, and this site’s scheme comparison and read-only share pages. The front end only renders what the engine returns — it never invents a number.
- · Simulator — Open the simulator
- · Deliverables
- · Compare schemes
- · Tech Hub
- · Open the product catalogue ↗
Who it is for
Electrical engineers sizing transformers, switchgear, cables and compensation; EPC and design institutes that need a fast feasibility check before detailed design; owners and procurement teams that want an indicative bill of materials and price before requesting a formal quotation.
How the calculation works
Every study runs on a separate deterministic engine service. The browser sends your scheme, the engine returns structured results (conclusions, assumptions and a meta block with the engine version and a parameter fingerprint), and the page renders them. No calculation request is sent until you press Run.
Standards referenced
IEC 60909 (short circuit) · IEC 60076-1 / 60076-7 and GB 1094 / GB 20052 (transformers, losses, thermal ageing) · IEC 61000-3-6 / IEEE 519 / GB/T 14549 / ER G5/5 (harmonics) · IEC 60255-151 (protection curves) · IEC 60364-4-41 / GB 50054 / IEEE 80 (earthing and person protection) · IEC 61439 / IEC 62271 (assemblies) · IEEE 1584 (arc flash) · IEC 61082 / IEC 60617 (drawings).
Honest limits
The engine is a steady-state pre-sales simulator. It does not do time-domain transient or full electromechanical stability analysis; cable dielectric loss, harmonic additional loss and skin effect are not counted; resonance scans above 2.5 kHz are declared invalid; and there is no PDF export — deliverables are a self-contained HTML design document plus SVG / DXF / CSV. Results are scheme and feasibility level and are not for construction without review.