Electrical Protection Calci

Electrical Protection Calculator is the professional, all-in-one commissioning companion for substation testing engineers, protection & control (P&C) specialists, and electrical engineering technicians. Easily calculate secondary injection test currents, plot operating curves, and verify trip boundaries across 6 world-leading protective relay manufacturers with authentic protection philosophies. KEY FEATURES: • Single-Phase & Three-Phase Pickup Tests: Simultaneously view 3-Phase pickup and Single-Phase pickup with automatic ×sqrt(3) zero-sequence filter compensation. • Benchmark Transformer Presets: Load substation benchmarks in one tap: - 25 MVA 132/33 kV Dyn11 - 50 MVA 220/66 kV YNd11 - 100 MVA 400/132 kV Yy0 - 16 MVA 66/11 kV Dyn1 • IDMT Overcurrent & Earth Fault Curve Calculator (51/51N): IEC 60255 & IEEE curve timing calculations (Standard Inverse, Very Inverse, Extremely Inverse, Long-Time Inverse, and Definite Time). • Relay Faceplate OCR Scanner: Extract nameplate text and CT ratings using camera OCR directly on site. • Professional PDF Commissioning Reports: Generate formatted test reports complete with settings, calculated thresholds, and test points. Share directly via Email, WhatsApp, or cloud storage. • Offline & Fast: Works 100% offline in remote substations and switchyards with built-in test history storage. SUPPORTED RELAY FAMILIES (87G & 87T): 1. MiCOM Series (P34x Generator / P64x & P63x Transformer): Dual-slope percentage bias differential with average restraint (|I1| + |I2|) / 2. 2. ABB / Hitachi Energy Relion® (REG670 GENPDIF / RET670 TRFPDIF): 3-Section percentage restraint characteristic + instantaneous unrestrained high-set (IdUnre). 3. GE Multilin Series (745 / G60 / T60 / UR Series): Dual-slope, dual-breakpoint percentage differential with tap scaling. 4. SEL Series (SEL-387 / SEL-787 / SEL-300G / SEL-487): Dual-slope percentage restraint with knee-point IRS1, SLP1, SLP2, and U87P high-set. 5. Siemens SIPROTEC Series (7UT6 / 7UM6 / 7UT8): Authentic Siemens Scalar-Sum Restraint: Irest = |I1| + |I2| (strictly NOT divided by 2). 6. Beckwith Electric Series (M-3425A / M-3311A / M-3310): Dual-slope percentage differential with programmable breakpoint. Empower your substation commissioning with precise, manufacturer-grade protection calculations! Electrical Protection Calculator is the professional, all-in-one commissioning companion for substation testing engineers, protection & control (P&C) specialists, and electrical engineering technicians.