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  <!-- Core Pages -->
  <url>
    <loc>https://amithvijayan.in/</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>1.0</priority>
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  <url>
    <loc>https://amithvijayan.in/about</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.9</priority>
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  <url>
    <loc>https://amithvijayan.in/articles</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
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  <url>
    <loc>https://amithvijayan.in/tools</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.95</priority>
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  <url>
    <loc>https://amithvijayan.in/changelog</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
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  <url>
    <loc>https://amithvijayan.in/contact</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
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  <url>
    <loc>https://amithvijayan.in/privacy</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>yearly</changefreq>
    <priority>0.5</priority>
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  <url>
    <loc>https://amithvijayan.in/terms</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>yearly</changefreq>
    <priority>0.5</priority>
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  <!-- 1. Power Systems & Fault Analysis -->
  <url> <!-- Short-Circuit Current & Fault Level Calculator (IEC 60909 / IEEE Std 141 (Red Book) / IEEE Std 399) -->
    <loc>https://amithvijayan.in/tools/short-circuit-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Per-Unit (pu) System Calculator (IEEE Std 399 (Brown Book) / IEC 60909) -->
    <loc>https://amithvijayan.in/tools/per-unit-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Per-Unit Base Conversion Calculator (IEEE Std 399 / Stevenson Elements of Power System Analysis) -->
    <loc>https://amithvijayan.in/tools/per-unit-base-conversion</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Symmetrical Components Calculator (Fortescue) (IEC 61000-4-30 / Fortescue Method (1918)) -->
    <loc>https://amithvijayan.in/tools/symmetrical-components-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Sequence Impedance Calculator (IEEE Std 142 (Green Book) / IEC 60909 / IEEE C37.010) -->
    <loc>https://amithvijayan.in/tools/sequence-impedance-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Three-Phase Fault Calculator (IEC 60909 / IEEE 141 (Red Book)) -->
    <loc>https://amithvijayan.in/tools/three-phase-fault-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- LG / LL / LLG Fault Calculator (IEC 60909-0 / IEEE Std 141 / Anderson Analysis of Faulted Power Systems) -->
    <loc>https://amithvijayan.in/tools/unbalanced-fault-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 2. Lines & Radial Distribution Feeders -->
  <url> <!-- Cable Sizing & Voltage Drop Calculator (IEC 60287 / IEC 60364-5-52 / IS 7098 / BS 7671) -->
    <loc>https://amithvijayan.in/tools/cable-sizing-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transmission Line Parameters & Surge Impedance Loading (SIL) (IEEE Std 738 / IEC 60909 / CIGRE Green Book on Overhead Lines) -->
    <loc>https://amithvijayan.in/tools/transmission-line-parameters</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Radial Feeder Load Flow Calculator (IEEE Std 141 / Distribution Automation Guidelines) -->
    <loc>https://amithvijayan.in/tools/radial-feeder-load-flow</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Voltage Profile & Feeder Remediation Analysis (IEC 60038 (Standard Voltages) / IEEE 141) -->
    <loc>https://amithvijayan.in/tools/voltage-profile-feeder-analysis</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 3. Protection & Relay Sizing -->
  <url> <!-- Current Transformer (CT) Sizing & Knee-Point Voltage Calculator (IEC 61869-2 (formerly IEC 60044-1) / IEEE Std C37.110) -->
    <loc>https://amithvijayan.in/tools/ct-sizing-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Magnetizing Inrush Current & Relay Coordination (IEEE Std C57.12.00 / IEEE C37.91 / IEC 60255-187-1) -->
    <loc>https://amithvijayan.in/tools/transformer-inrush-current</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Full-Load Current & HV Fuse Sizing (IEC 60076-1 / IEC 60282-1 / IEC 60076-5) -->
    <loc>https://amithvijayan.in/tools/transformer-fuse-sizing</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 4. Power Transformers & Core Modeling -->
  <url> <!-- Transformer Fault Current & Sizing Calculator (IEC 60076-1 / IEC 60076-5 / IEC 60076-8 / IEC 60282-1 / IEEE C57.12 / IEEE C57.32) -->
    <loc>https://amithvijayan.in/tools/transformer-fault-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Percentage Impedance to Ohms (Ω) Converter (IEC 60076-1 / IEC 60909-0 / IEEE C57.12.00) -->
    <loc>https://amithvijayan.in/tools/transformer-ohmic-impedance</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Voltage Regulation & Voltage Drop (IEC 60076-1 Annex C / IEEE C57.12.90) -->
    <loc>https://amithvijayan.in/tools/transformer-voltage-regulation</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Efficiency & Part-Load Losses (IEC 60076-1 / IS 2026 / IEEE C57.12.00) -->
    <loc>https://amithvijayan.in/tools/transformer-efficiency</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Maximum Efficiency Operating Load (IEC 60076-1 / IEEE C57.12.00) -->
    <loc>https://amithvijayan.in/tools/transformer-max-efficiency</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- On-Load Tap Changer (OLTC) Step Voltage Modeler (IEC 60076-1 / IEC 60214-1) -->
    <loc>https://amithvijayan.in/tools/transformer-oltc-tap-changer</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Parallel Transformer Load Sharing & Division (IEC 60076-8 / IEEE C57.12.00) -->
    <loc>https://amithvijayan.in/tools/transformer-parallel-sharing</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Distribution Transformer Sizing from Load & Growth (IEEE C57.96 / IS 10561 / IEC 60076-1) -->
    <loc>https://amithvijayan.in/tools/transformer-capacity-sizing</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Short-Circuit Thermal Withstand Capability (IEC 60076-5 / IEEE C57.12.00 / IS 2026-5) -->
    <loc>https://amithvijayan.in/tools/transformer-short-circuit-withstand</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Vector Group Phase Displacement & Paralleling (IEC 60076-1 / IEC 60076-8) -->
    <loc>https://amithvijayan.in/tools/transformer-vector-group</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Loss Capitalization & Lifecycle Cost (TCO) (IEEE Std C57.12.00 / CIGRE WG A2.49 / IS 2026) -->
    <loc>https://amithvijayan.in/tools/transformer-loss-capitalization</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 5. Substation Grid & Grounding Safety -->
  <url> <!-- Substation Earthing Grid & Touch/Step Voltage Calculator (IEEE Std 80-2013 / IEEE Std 81 / IS 3043) -->
    <loc>https://amithvijayan.in/tools/earthing-grid-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Neutral Earthing Resistor (NER) Sizing Calculator (IEEE Std C57.32 / IEEE Std 142 (Green Book) / IS 3043) -->
    <loc>https://amithvijayan.in/tools/neutral-earthing-resistor</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Zigzag Grounding Transformer Zero-Sequence Impedance (Z₀) (IEEE Std C57.32 / IEC 60076-1 / IS 3043) -->
    <loc>https://amithvijayan.in/tools/zigzag-grounding-transformer</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 6. Substation Asset Health & Diagnostics -->
  <url> <!-- Transformer Health Index & Thermal Aging Modeler (IEEE C57.91 / IEC 60076-2 / IEC 60076-7 / IEEE Std C57.104 / IEEE C57.19.100 / CIGRE TB 414) -->
    <loc>https://amithvijayan.in/tools/transformer-health-index</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Top-Oil & Winding Temperature Rise (IEC 60076-2 / IEC 60076-7 / IEEE Std C57.91) -->
    <loc>https://amithvijayan.in/tools/transformer-temperature-rise</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Winding Resistance 75°C Temperature Correction (IEEE Std C57.12.90 / IEC 60076-1 / IS 2026-1) -->
    <loc>https://amithvijayan.in/tools/transformer-winding-resistance</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer Turns Ratio (TTR) Test & Error Evaluation (IEC 60076-1 / IEEE Std C57.12.90) -->
    <loc>https://amithvijayan.in/tools/transformer-turns-ratio-ttr</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Bushing Power Factor, Tan Delta & Capacitance (C₁) (IEEE Std C57.19.100 / IEC 60137) -->
    <loc>https://amithvijayan.in/tools/bushing-tan-delta-capacitance</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Transformer DGA Gas Generation Rate & TDCG Modeler (IEEE Std C57.104-2019 / IEC 60599 / CIGRE TB 771) -->
    <loc>https://amithvijayan.in/tools/transformer-dga-gas-rate</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 7. Substation DC & Auxiliary Systems -->
  <url> <!-- Substation DC Auxiliary Battery Bank & Charger Sizing (IEEE Std 485 / IEEE Std 484 / IEC 60896) -->
    <loc>https://amithvijayan.in/tools/substation-dc-battery</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 8. Solar PV & BESS Storage Systems -->
  <url> <!-- C&I & Grid-Scale BESS Sizing & 20-Year Dispatch Modeler (IEEE 2800 / IEC 62933 / NFPA 855 / UL 9540A) -->
    <loc>https://amithvijayan.in/tools/bess-sizing</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Solar LCOE & Grid Parity Engine (NREL SAM / IEC 61724 / IRENA Costing Metrics) -->
    <loc>https://amithvijayan.in/tools/solar-lcoe</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Solar PV Single Line Diagram (SLD) & 2-Sheet CAD Design Generator (IS 3043 (India) / DEWA Shams Dubai / EMA (Singapore) / ENA G99 (UK/EU) / SEC DCS (KSA) / IEEE 1547 (USA)) -->
    <loc>https://amithvijayan.in/tools/solar-pv-sld-generator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Carbon Offset & Emission Avoidance Modeler (GHG Protocol Scope 2 / IPCC / CEA India Baseline Database) -->
    <loc>https://amithvijayan.in/tools/carbon-offset</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- EV Charging Hub Demand & Feeder Sizing Calculator (IEC 61851 / IEC 60364-7-722 / IEEE Std 2030.1.1) -->
    <loc>https://amithvijayan.in/tools/ev-infrastructure-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 9. Power Quality, Power Factor & Harmonics -->
  <url> <!-- Power Factor Correction & Capacitor Bank Sizing (IEEE Std 18 / IEEE Std 519 / IEC 60831) -->
    <loc>https://amithvijayan.in/tools/power-factor-calculator</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

  <!-- 10. Residential Clean Tech & Prosumer Microgrids -->
  <url> <!-- Residential Solar & PM Surya Ghar Subsidy Modeler (MNRE PM Surya Ghar Muft Bijli Yojana / DISCOM Net-Metering Regulations) -->
    <loc>https://amithvijayan.in/tools/residential-solar-subsidy</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Residential Smart Battery & Blackout Backup Analyzer (IEC 62619 / UL 1973 / IS 16046 (LFP Battery Safety)) -->
    <loc>https://amithvijayan.in/tools/residential-battery-backup</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url> <!-- Microgrid P2P Power Exchange & Transactive Energy Modeler (IEEE 2030.7 (Microgrid Controllers) / CIGRE C6.28) -->
    <loc>https://amithvijayan.in/tools/prosumer-p2p-exchange</loc>
    <lastmod>2026-09-25</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>

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