Version Change Log | Electrical Engineering Tools Platform

Comprehensive engineering audit trail detailing version upgrades, algorithm derivations, and standards conformance across 244 electrical calculators.

Recent Releases

v1.1.0 — Engineering Intelligence & Verification: Method Documentation, Formula Library & Test Vector Framework (October 2026)

Production Release v1.1.0 ('Engineering Intelligence & Verification') delivering an authoritative engineering verification and documentation framework across all 244 calculation methods and CAD suites. Introduces the W-Question Engineering Documentation architecture (What, Why, When, Where, Who, How), canonical standards vs assumptions differentiation, deterministic test-vector regression gates, an Electrical Engineering Formula Library, a technical Glossary, rule-based engineering interpretation, step-by-step calculation traceability, and an Engineering Verification Center.

Engineering Method Registry Strengthening: Canonical metadata model with discipline classifications, calculation basis, methodology, stated assumptions, physical boundary limitations, and documentation completeness scores.
The W-Question Engineering Documentation Model: Integrated structured engineering documentation across all calculation methods detailing What it calculates, Why it is needed, When to perform it, Where in the grid it applies, Who uses it, and How the formulation is mathematically derived.
Standards & Reference Framework: Explicit differentiation between Calculation Basis, Governing Primary Standard, Supporting References, Engineering Assumptions, and Regulatory Mandates without speculative compliance claims.
Verification & Test-Vector Framework: Formal independent verification layer pairing deterministic calculation methods with canonical benchmark vectors, expected outputs, tolerances, and last-verified audit dates across 200/200 regression tests.
Electrical Engineering Formula Library: Searchable repository of core power systems equations (Three-phase fault, SIL, Sverak ground grid resistance, per-unit base conversion, PV cold Voc, cable derating, LOLE/LOLP) with LaTeX renderings, variables, units, and worked numerical benchmarks.
Engineering Glossary Foundation: Interactive lexicon indexing high-value power engineering concepts (Per-Unit, Fault Level, X/R Ratio, GMR/GMD, SIL, Hosting Capacity, GPR, Touch/Step Voltages, THD, DER, BESS, OLTC, CT Knee Point, LOLE) with governing standards cross-links.
Calculation Traceability & Substitution: Transparent step-by-step calculation trace decomposing execution into parameter normalization, governing formulation, intermediate equations, numerical substitution, and final engineering outputs.
Rule-Based Engineering Interpretation Layer: Deterministic, transparent interpretation of numerical outputs against statutory limits, switchgear breaking classes, and standard industry safety thresholds without non-deterministic AI.
Search & Discovery Upgrade: Expanded cross-indexing across method titles, standards (IEC 60909, IEEE 80, IS 3043, NERC), formulas, variables, and technical glossary concepts with instant keyboard navigation.
Engineering Verification Center: Audit dashboard presenting live regression test-vector execution, standards mapping audit status, and documentation completeness scorecards.

v1.0.0 — Primary Engineering Sector: 10 Unified Disciplines & Complete Suite Consolidation (September 2026)

Official Production 1.0.0 Release consolidating all 244 electrical engineering calculators (44 full-featured Interactive CAD/GUI suites + 200 deterministic IEC/IEEE/IS standards methods) into a unified Primary Engineering Sector. Organized seamlessly across 10 specialized engineering disciplines without artificial separation between interactive tools and standards calculation methods, featuring direct card-click execution and simplified parameter guidance.

Unified 10-Discipline Architecture: Re-architected categories into 10 cohesive engineering domains: (1) Power Systems & Faults, (2) Lines & Radial Feeders, (3) Protection & Relays, (4) Power Transformers, (5) Substation Grid & Grounding, (6) Substation Asset Health & Diagnostics, (7) Substation DC & Auxiliary Systems, (8) Solar & BESS Storage, (9) Power Quality & Harmonics, and (10) Residential & Prosumer.
Single-Part Suite Integration: Removed artificial silos separating the 200 standards methods from the 44 interactive suites. Each discipline now presents both Interactive CAD Suites and Standards Calculation Methods within a unified responsive card grid.
Direct Card-Click Execution: Enabled direct card-click loading across all 244 calculator tiles with responsive hover feedback, active ring styling, and integrated CAD shortcuts.
User-Friendly Parameter Guidance: Standardized clean, accessible tooltips across all input parameter fields with plain-language engineering explanations and units.
Deterministic Parameter Sizing: Harmonized parameter passing and direct CAD cross-linking from all 200 standards calculations directly into their corresponding parent visual simulation suites.

v1.0.0-rc.2 — Unified Primary Engineering Sectors & Comprehensive Info Tooltip Architecture (September 2026)

Unified all 44 interactive CAD/GUI suites and 200 deterministic IEC/IEEE/IS standards calculation methods under a seamless 7-sector Primary Engineering Sector structure, eliminating disconnected view switchers. Integrated universal technical info tooltips across all engineering calculators, formula input fields, result cards, and standards tags, providing instant contextual engineering definitions and governing standard citations.

Unified Sector Architecture: Merged the 44 Interactive CAD applications and 200 Standards Calculation methods into a unified Primary Engineering Sector navigation model covering Power Systems & Faults, Lines & Feeders, Protection & Relays, Power Transformers, Substation Grid & Health, Solar & BESS, and Residential Prosumer.
Universal Info Tooltip Architecture: Added InfoTooltip integration across input parameters, result cards, secondary analytical metrics, and standards badges across all calculators (IEC 60909, IEEE 141, IEEE 80, IEEE C57, IEC 60076, IEC 61936, IS 3043).
Interactive Standards Calculation Modal: Implemented standalone StandardsCalculationModal supporting instant benchmark test vector execution, interactive parameter sensitivity testing, and seamless launching of visual CAD suites.
Synchronized Cross-Discipline Search: Enhanced search indexing to filter both visual CAD tools and deterministic standards calculation methods simultaneously by name, formula, governing standard, and keywords.

Interactive calculation engine and real-time CAD solver available online at https://amithvijayan.in/changelog.

Power Systems Operations, AMI & Loss Reduction

Over a 12-year engineering career in power distribution and utility operations at Kerala State Electricity Board Ltd (KSEBL), Amith Vijayan, CEng, has driven regional transmission and distribution performance to 99.9% reliability, implemented advanced automated metering infrastructure (AMI), and systematically reduced AT&C technical and commercial losses.

Chartered Engineer (CEng) certified by The Institution of Engineers (India) (IEI)
99.9% grid reliability sustained across regional distribution networks
15% non-technical losses reduced through automated telemetry and smart metering audits
8.6% technical losses sustained through feeder optimization and conductor reconductoring
500+ engineers, utility technicians, and community members trained in energy conservation and substation safety
Invited Keynote Speaker at CIRED 2019 (Madrid, Spain) on Smart Grid Digitisation and Distribution Strategies

44 Precision Electrical & Power Engineering Calculators

Free, client-side, standards-compliant engineering calculators designed for utility engineers, power system planners, and clean energy developers:

1. Residential & Prosumer Sizing

PM Surya Ghar Solar Subsidy & Generation Calculator — Rooftop solar PV generation, net metering credits, and direct subsidy calculations.
Home Battery & Blackout Backup Modeler — Lithium LFP battery bank duration, critical circuits autonomy, and diesel avoidance savings.
Microgrid Peer-to-Peer (P2P) Power Exchange Clearing — Transactive energy trading, DISCOM wheeling tariffs, and locational marginal pricing per IEEE 2030.7.

2. Power Systems & Sizing

IEC 60909 Symmetrical 3-Phase Short-Circuit Calculator — Fault levels, breaking capacity, and peak making currents.
LV/MV Cable Sizing & Voltage Drop Calculator (IEC 60287 / IS 7098) — Ampacity derating, thermal short-circuit withstand, and run voltage drops.
Transformer Fault Current & Sizing Calculator (IEC 60076) — Full-load current, %impedance fault levels, and breaker trip ratings.
Transformer Full-Load Current & HV Fuse Sizing (IEC 60282-1) — Primary backup fuse links and 12x magnetizing inrush ride-through.
Transformer Percentage Impedance to Ohms Converter (IEC 60076-1) — Physical ohmic impedance referred to HV and LV sides.
Transformer Voltage Regulation & Voltage Drop (IEC 60076-1 Annex C) — Voltage drop and percentage regulation across lagging and leading power factors.
Transformer Efficiency & Part-Load Loss Modeler (IEC 60076-1) — Core iron and copper loss efficiency across 25% to 125% load points.
Transformer Maximum Efficiency Operating Load (IEC 60076) — Optimal loading level where iron losses equal load copper losses.
On-Load Tap Changer (OLTC) Step Voltage Modeler (IEC 60214-1) — Bus voltage stepping and discrete tap changer AVR deadbands.
Parallel Transformer Load Sharing & Division (IEC 60076-8) — Load division across transformers with unequal MVA ratings or impedances.
Transformer Magnetizing Inrush Current & ANSI 50 Relay Pickup (IEEE C57.12) — Peak inrush current and instantaneous overcurrent coordination.
Distribution Transformer Sizing from Load & Growth (IEEE C57.96) — Connected load, demand factor, and multi-year load growth sizing.
Transformer Short-Circuit Thermal Withstand Capability (IEC 60076-5) — Adiabatic final temperature and 250°C copper limit verification.
Transformer Vector Group Phase Displacement & Paralleling (IEC 60076-1) — Angular phase displacement and parallel compatibility check.
Power Factor Correction & Shunt Capacitor Sizing (IEEE 18 / 519) — kVAr requirements, utility penalty elimination, and resonance risk checks.
Current Transformer (CT) Sizing & Saturation Calculator (IEC 61869-2) — Class 5P20/PS burden and saturation knee-point voltage (Vk).
Per-Unit (pu) System Calculator (IEEE 399) — Base MVA/kV normalization across multi-voltage electrical networks.
Per-Unit Base Conversion Calculator (IEEE 399) — Re-base equipment impedances from manufacturer nameplates to common study bases.
Symmetrical Components Calculator (IEC 61000-4-30) — Fortescue decomposition into positive, negative, and zero sequence phasors.
Sequence Impedance Calculator (IEEE 142 / IEC 60909) — Z1, Z2, Z0 modeling and IEEE 142 effective grounding checks.
Three-Phase Fault Calculator (IEC 60909) — Symmetrical short-circuit fault MVA and peak current evaluation.
LG / LL / LLG Fault Calculator (IEC 60909-0) — Unsymmetrical fault analysis and healthy phase voltage rises.
Radial Feeder Load Flow Calculator (IEEE 141) — Iterative Backward/Forward Sweep solver for multi-node distribution networks.
Voltage Profile & Feeder Remediation Analysis (IEC 60038) — Feeder voltage drop modeling and shunt capacitor remediation.

3. Substations & Assets

Transformer Health Index (HI) & Aging Modeler (IEEE C57.91) — DGA Duval Triangle, oil BDV, and furfural paper loss-of-life.
Neutral Earthing Resistor (NER) Sizing Calculator (IEEE C57.32) — Resistance (Ω), continuous ampacity, and thermal energy dissipation.
Zigzag Grounding Transformer Zero-Sequence Impedance (IEEE C57.32) — Z₀ calculation and earth fault current rating for ungrounded systems.
Transformer Loss Capitalization & Lifecycle Cost TCO (IEEE C57.12.00) — Capitalized cost of no-load (A) and load (B) losses.
Transformer Top-Oil & Winding Temperature Rise (IEC 60076-2) — ONAN, ONAF, and OFAF thermal rise and hot-spot modeling.
Transformer Winding Resistance 75°C Correction (IEEE C57.12.90) — Temperature correction and phase unbalance percentage.
Transformer Turns Ratio (TTR) Test & Error Evaluation (IEC 60076-1) — Ratio error verification against statutory ±0.5% tolerance.
Bushing Power Factor, Tan Delta & Capacitance (IEEE C57.19.100) — 20°C dissipation factor normalization and C₁ Doble test deviation.
Transformer DGA Gas Generation Rate & TDCG Modeler (IEEE C57.104) — Daily gas rates in ppm/day and Condition 1-4 monitoring.
Substation DC Battery Bank & Charger Sizing (IEEE 485) — Stationary 110V/220V Ah bank capacity and duty cycle pulse loads.
Substation Earthing Grid & Potential Modeler (IEEE Std 80) — Grid resistance (Rg), ground potential rise (GPR), and touch/step voltages.
Transmission Line Parameters & Engineering Suite (IEEE 738 / IEC 60865 / CIGRE) — GMD/GMR, inductance, capacitance, SIL, ABCD matrices, thermal ampacity, sag/tension, right-of-way clearances, and reactive compensation.

4. Clean Energy & Storage

C&I & Grid-Scale BESS Sizing & 20-Year Dispatch (IEEE 2800 / IEC 62933) — Power (MW) and energy (MWh) storage optimization and degradation.
Solar LCOE & Grid Parity Cashflow Engine (NREL SAM / IRENA) — 25-year Levelized Cost of Electricity, IRR, and payback cash flows.
Carbon Offset & Scope 2 Emission Modeler (GHG Protocol) — Grid emission factor abatement and tree planting equivalencies.
EV Charging Hub Demand & Feeder Sizing (IEC 61851) — Simultaneity demand, service transformer sizing, and cable runs.
Solar PV Single Line Diagram (SLD) & 2-Sheet CAD Generator (IS 3043 / DEWA / EMA / G99 / SEC / IEEE / IEC) — Multi-sheet CAD electrical SLD, 14-point statutory verification register, and vector A3 PDF submittal bundle conforming to India, Dubai, Singapore, UK/EU, KSA, and USA.

Publications & Industry Books

"When Sparks Become Soul: A Memoir of Struggle, Resilience, and High-Voltage Transformation"

Published memoir chronicling personal and engineering resilience through electrical utility challenges. Available on Amazon.

"Unleashing the Power of Advanced Metering Infrastructure: A Comprehensive Guide for Electric Utilities"

Comprehensive utility project guide detailing AMI planning, meter head-end procurement, cybersecurity, and consumer analytics.

Platform Version Changelog & Technical Updates