⚡
IEC 60909 Short-Circuit
3-phase, 1-phase, and peak fault currents from nameplate data alone. Transformer Zk%, cable impedance, utility fault MVA — every result cites the exact IEC 60909 clause.
IEC 60909
🔥
IEEE 1584 Arc Flash
Incident energy (cal/cm²), arc flash boundary, and PPE category 1–4 at every bus. Print-ready labels and a dated audit trail ready for the AHJ.
IEEE 1584-2018
📈
TCC Relay Coordination
Interactive log-log TCC canvas — drag device curves, see mis-coordinations flagged instantly, check CTI ≥ 0.3 s across every device pair, and export to your PDF coordination report.
IEC 60255
⚙️
Motor Coordination Type 1 & 2
Verifies your SCPD clears before the contactor welds at the actual prospective fault current. Type 1 and Type 2 per IEC 60947-4-1 and UL 508A.
IEC 60947-4-1
🎯
Distance Protection Zones
Zone 1/2/3 reaches on an interactive R-X impedance diagram with load impedance, load encroachment limits, and pilot scheme infeed correction per IEC 60255-121.
IEC 60255-121
🔀
Transformer Differential
Biased differential with vector group correction, dual-slope bias characteristic, and 2nd harmonic inrush restraint — simulates in-zone faults vs magnetising inrush.
IEC 60255
🛡️
IED Protection Relay Settings
ANSI 50/51/67/21/27/59/81/87 full function set with zone-selective interlocking, directional overcurrent, and differential. COMTRADE export for FAT sign-off.
ANSI C37
📊
Load Flow Analysis
Newton-Raphson and Gauss-Seidel solvers — per-bus voltage magnitude, angle, line flows, and losses on any topology. Convergence verified in 3–5 iterations.
IEC 60038
〰️
Harmonic Analysis
THDi and THDv for VFDs, UPS, and EV chargers — compared against IEC 61000-3-2 and -3-4 limits by Rsce category, with resonance frequency identification.
IEC 61000-3-2
🔋
Power Factor Correction
kVAr compensation from tan φ difference, standard step sizes suggested, and resonance frequency checked against harmonic sources before you install the capacitor bank.
IEC 60364
📉
Power Quality Assessment
Voltage unbalance, flicker (Pst), sags, THDv, and frequency deviation checked against EN 50160 and IEC 61000-4 — voltage sags plotted on the ITIC/CBEMA curve.
EN 50160
🔌
Overhead Line Rating
Conductor thermal rating with solar radiation, wind cooling, and ambient temperature per IEC 61597 — static and dynamic line rating with sag and clearance calculation.
IEC 61597
📋
Load Estimation
Connected load, demand factor, diversity factor, and 20-year growth projection rolled up per feeder and transformer — load schedule output ready for single-line annotation.
Demand Factor
🔁
Frequency Response & UFLS
Frequency nadir and ROCOF for any loss-of-generation event. UFLS stage validation — threshold frequency, delay, and MW shed per step — against grid code limits.
IEC 60034
⚙️
AVR & PSS Design
ST1A, DC1A, and AC1A excitation system models per IEEE 421.5 with Bode plot, gain/phase margins, and PSS1A washout filter tuning at inter-area oscillation frequency.
IEEE 421.5
🔌
Cable Sizing — IEC / BS / IS
Current-carrying capacity with derating for temperature, grouping, and installation method per IEC 60364-5-52. Voltage drop and thermal withstand checks included.
IEC 60364
🔌
Cable Sizing — NEC (NFPA 70)
NEC Table 310.15(B)(16) ampacity with temperature and conduit fill correction factors. AWG/kcmil selection with voltage drop in feet at 3% NEC recommendation.
NFPA 70 NEC
📏
Busbar Sizing
Thermal cross-section per IEC (A ≥ Ik√tk/k) and electromagnetic force between phases per IEC 60865. Support span verified against beam bending stress.
IEC 60865
🔧
Transformer Sizing
Demand factor, diversity, future growth, altitude, and ambient temperature derating per IEC 60076. Next standard kVA rating selected above — loading percentage shown.
IEC 60076
🏭
Generator Sizing
Running kVA from all loads plus the peak starting kVA from the largest motor started last — ISO 8528 rated at 0.8 PF with selected kVA covering both conditions.
ISO 8528
🔄
Motor Starting Analysis
DOL, star-delta, autotransformer, soft-starter, and VFD starting compared — voltage dip at PCC, accelerating torque vs load torque, and starting time for each method.
IEC 60034
📡
VFD Sizing
Output current for ND/HD duty cycle, braking resistor sizing for regenerative loads, and input harmonic current spectrum (6-pulse / 12-pulse / active front end).
IEC 61800
🔃
Soft Starter Sizing
Current ramp vs torque ramp mode comparison, thermal capacity per start, and starts-per-hour limit — verifies the SCR handles the application class A or B duty.
IEC 60947-4-2
☀️
Solar PV System Sizing
String configuration, inverter sizing (DC/AC ratio 1.0–1.3), DC protection, and AC connection sizing — all checked against IEC 62446 and NEC Article 690.
IEC 62446
🔋
BESS Sizing
Required kWh from load profile and backup duration, C-rate check, round-trip efficiency, and degradation model — capacity at years 1, 5, 10, and end-of-life.
IEC 62619
🌍
Earthing System Design
Touch and step potential per IEEE 80 — grid conductor sizing, mesh and step voltages, and tolerable body current limit calculated for the fault clearing time.
IEEE 80
🌊
Transient Stability & CCT
Time-domain swing equation simulation for multi-machine networks. Critical clearing time quantified by bisection — rotor angle and speed deviation plots for the stability report.
IEEE 1110
📉
Voltage Stability
Continuation power flow P-V and Q-V nose curves — voltage collapse point, maximum loadability margin, and weakest bus identification for reactive support sizing.
CPF / P-V
〰️
Small-Signal Stability
Eigenvalue analysis of the linearised multi-machine state-space — damping ratio, participation factor, and mode shape for every oscillation mode. Inter-area vs local classification.
Modal Analysis
📊
DC Optimal Power Flow
DC-OPF with linear cost curves, bus injection limits, and line thermal constraints — LMPs at each bus and shadow prices on congested lines in under 10 seconds.
DC-OPF
🗓️
Unit Commitment & Dispatch
24-hour MILP schedule with startup/shutdown costs, ramp limits, and spinning reserve. HiGHS solver — optimal solution typically in under 30 s for 10-unit systems.
MILP / HiGHS
⚡
Device Health Monitoring
Contact wear and cumulative I²t tracked for MCCBs and ACBs. Remaining useful life estimated from trip and fault current history — maintenance priority ranked.
Predictive
🔮
Digital Twin
Weighted Least Squares state estimation fuses SCADA meter readings — bad data detection and identification — to produce a fully observable network state in real time.
WLS / Real-time
🔬
pandapower Engine
Validated NR and IEC 60909 SC studies tested against IEEE 9, 14, 30, 118-bus and CIGRE MV/LV benchmarks — V&V results shown alongside every calculation.
Open-source
⚡
OpenDSS Engine
Three-phase unbalanced distribution networks with DER dispatch, EV loads, and unbalanced phases — time-series quasi-static and harmonic penetration on any feeder topology.
EPRI / IEEE
📦
NEC Conduit & Box Fill
NEC Chapter 9 Table 1 fill percentage for any conductor mix in EMT, IMC, RMC, or PVC. Box fill per Article 314 — flags overfill before the installation begins.
NFPA 70 Art 314
🏷️
NEMA Motor Frame & Enclosure
NEMA MG-1 frame number from HP, RPM, and service factor. Enclosure type matched to NEC area classification — ODP, TEFC, TENV, TEAO, or explosion-proof.
NEMA MG-1
🔒
ANSI C37 Switchgear Ratings
Symmetrical and asymmetrical interrupting ratings checked against calculated fault current. S-factor applied for older C37.06 equipment. Momentary rating vs peak ip.
ANSI C37
🌐
NEC Art. 250 Grounding
EGC from NEC Table 250.122, GEC from Table 250.66, and main bonding jumper (12.5% of largest service entrance conductor) — all cited with the exact NEC article.
NFPA 70 Art 250
📐
ANSI C84.1 Voltage Levels
Nominal, maximum, and minimum voltage at each bus cross-checked against ANSI C84.1 Range A (±5%) and Range B limits — flags buses in violation so you can upsize a tap.
ANSI C84.1
✏️
IEC 60617 SLD Editor
Drag-and-drop IEC 60617 symbols, wire them with a click, and produce a standards-compliant one-line diagram before the site walkthrough ends — desktop and tablet.
IEC 60617
🗂️
Multi-diagram Tabs
Multiple diagram tabs inside one project — switch between your 132 kV, 33 kV, and 11 kV networks without losing your place on any of them.
Multi-voltage
📦
Component Templates
Save any component group as a named template and drop it into any diagram — consistent symbols, consistent parameters, every time across all your projects.
Reusable
📄
PDF Report Generation
One-line diagram, TCC curves, arc flash labels, and fault study assembled into a stamped PDF — ready to submit to clients and the AHJ in one click.
Client-ready
🏷️
White-label Reports
Upload your logo and set your brand colour once — every PDF GridSense generates carries your firm's name and registration number with no GridSense watermark.
Branded
🔗
Shared Diagram Viewer
One-click share link generates a public read-only viewer instantly — your client, contractor, or AHJ views the one-line on any device without a GridSense account.
No login needed
🕐
Version History
Every save creates a timestamped snapshot you can browse and restore. A complete audit trail from first diagram to final issue — with who made each change.
Audit trail
👥
Team & Org Accounts
Invite by email, assign owner / admin / member / viewer roles — no IT involvement. Org projects visible to all members with appropriate access level.
Role-based
🎓
Onboarding Tour
Guided tour walks you through drawing a one-line, running a fault study, and generating a report — the full workflow in about 10 minutes, in-place context tips.
10 min
🔑
Public REST API
Every project, calculation, and diagram accessible via a documented REST API — create projects, save networks, retrieve fault results, build GridSense into your tools.
OpenAPI
🔔
Webhooks
Subscribe to project.created, network.saved, diagram.shared, and calculation.completed events — every POST signed with HMAC-SHA256. Delivery history and retry log in the Dev panel.
HMAC-SHA256
📱
Mobile & Tablet Ready
Pinch-zoom and pan the SLD canvas, check arc flash labels at the panel, review TCC curves on-site — full interface on any touch device, no app download required.
Responsive
🎛️
Tiered Access
Starter, Core, Professional, and Grid Studies tiers — upgrade or add seats at any time. Full platform + API + webhooks + team accounts on Grid Studies.
Starter → Grid Studies