Transformer Differential Protection (87T): Slope & Harmonics
Wired White v3 Match transformer CT ratios and vector-group phase shift, plot a dual-slope 87T characteristic, and check through faults, internal faults and harmonic blocking.
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Wired White v3 
Welding Inverter Design Calculator
Wired White v2 Size a two-switch forward welding inverter: transformer turns and copper, output choke, switch currents and losses, mains demand, and the arc load characteristic.
Transformer Hot Spot, Ageing and Harmonic Derating
Wired White v3 Model a 24-hour transformer load cycle, hot-spot temperature and insulation life use. Calculate harmonic loss factors and loss-based derating from a current spectrum.
Dual Active Bridge Calculator: Power, ZVS and RMS Currents
Wired White v3 Optimize TPS timing for minimum RMS current or circulating backflow with both bridges screened for ZVS. Compare SPS across bidirectional power, including an 800 V V2G preset.
LLC Resonant Converter Designer: Gain, ZVS and Stress
Wired White v3 Size an LLC tank, compare FHA with exact PO/NP gain, and check ZVS charge margin and component stress for half-bridge or full-bridge operation.
Overcurrent Relay Coordination Calculator: IEEE & IEC TCC
Wired White v3 Plot IEEE and IEC relay curves with CT ratios, instantaneous trips and user fuse points. Screen grading margins and find a candidate upstream time dial and pickup interval.
Short-Circuit Current Calculator
Wired White v2 Estimate three-phase and single-phase fault current, motor backfeed and peak current using a simplified IEC 60909 impedance model. Compare duty with breaker capacity.
Flyback Converter Design Calculator
Wired White v2 Size or check a flyback transformer in DCM or CCM. Calculate inductance, turns ratio, peak and RMS currents, device voltage stress, winding estimates and an RCD clamp.
Transformer Design Calculator
Wired White v2 Size mains and ferrite bridge transformers with turns per volt, peak flux, window fill, copper and core losses, and temperature rise. Includes traceable loss models and winding checks.