# Electrical Protection Calci — Elect Protection Calculator

> Elect Protection Calculator (iPhone/iPad app by Swapnil More.)

- Source: https://appshunter.io/ios/app/electrical-protection-calci/id6804367962 (this page in markdown: same URL + `.md`)
- Developer: [Swapnil More](https://appshunter.io/developer/6799668117)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 16.4 · 80 MB
- Languages: American English
- Released: 2026-09-14
- Data updated: 2026-10-10

## What is 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.

## Is Electrical Protection Calci safe?

Not enough ratings yet to assess Electrical Protection Calci.

## Is Electrical Protection Calci legit?

Electrical Protection Calci has limited verification signals. The AppsHunter Legitimacy Score for Electrical Protection Calci is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 8.1.0 — 2026-09-20

A. Massive Upgrade: The Transformer Toolkit & Power Calculator 
• All-New Transformer Hub: We've transformed the Transformer section into a comprehensive toolkit! It now includes a Winding Temperature Resistance Calculator, an OLTC Tap Matrix Generator, and an interactive Vector Group Clock Face to easily visualize phase shifts. 
• Advanced Power Calculator: Discover the new 3-Phase AC Power Calculator featuring bidirectional math and a dynamic, visual Power Triangle chart. 
• Interactive Overcurrent Curves: Tapping the overcurrent charts now drops a precise, interactive crosshair marker to reveal exact coordinates for PSM and Operating Time.

B.  Better Navigation & Accessibility 
• Instant Language Switching: A new Global Language Selector is now instantly accessible from the top bar on any screen. 
• Refined UI: Streamlined bottom navigation and fixed layout overlaps on Android for a sleeker experience.

C. Performance Boosts 
• Major under-the-hood engine upgrades mean significantly faster startup times, less memory usage, and buttery-smooth scrolling on complex charts and long lists.

### 8.0.0 — 2026-09-19

• Top Apparatus Toggle: Instantly switch between Generator Differential (87G) and Transformer Differential (87T) on the same unified testing screen.
• Complete 87T Transformer Protection Engine:
  - Vector Group phase shift compensation: Dyn11 (+30°), Dyn1 (-30°), YNd11 (+30°), YNd1 (-30°), Yy0 (0°), and Dd0 (0°).
  - Rated full-load primary and secondary current calculations (In,HV and In,LV).
  - Automatic CT mismatch ratio (Kmatch) scaling.
  - 2nd Harmonic Inrush (100/120 Hz) and 5th Harmonic Overfluxing (250/300 Hz) restraint & blocking verification.
• Touch-Interactive Curves: Tap anywhere on differential characteristic curves to inspect bias/differential coordinates (Ibias, Idiff), Trip/Stable zones, and required CT injection currents.
• Touch-Interactive Phasor Diagrams: Real-time visual phase displacement with magnitude & angle tooltips.

### 7.0.1 — 2026-09-15

1. Relay Nameplate OCR Scanner: Use your device camera to scan physical protective relay nameplates and instantly extract and auto-populate specification details directly into your testing modules. No data is collected and stored in this process.
2. UI Optimization: Dark Mode has been deprecated to deliver a unified, high-contrast interface engineered for maximum readability in glaring field environments.

### 7.0.0 — 2026-09-14

No release notes.

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