# High Voltage Engineering Tools — 76 power engineering tools

> 76 power engineering tools (iPhone/iPad app by Yuhsiu Lai.)

- Source: https://appshunter.io/ios/app/high-voltage-engineering-tools/id6781438065 (this page in markdown: same URL + `.md`)
- Developer: [Yuhsiu Lai](https://appshunter.io/developer/433114647)
- Category: Utilities, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English
- Released: 2026-06-23
- Data updated: 2026-09-07
- User reviews in markdown: https://appshunter.io/ios/app/high-voltage-engineering-tools/id6781438065/reviews.md

## What is High Voltage Engineering Tools?

High Voltage Engineering Tools puts a complete high-voltage power engineering reference and calculation suite in your pocket. 76 calculators and 7 reference tables cover the everyday design, study and field work of substation, transmission and distribution engineers — each tool shows the governing formula and exports a clean PDF calculation sheet.

Every calculation runs instantly on your device. No account, no sign-up, nothing leaves your phone.

WHAT'S INSIDE — 76 TOOLS ACROSS 9 DISCIPLINES
• Cables & Conductors — voltage drop, ampacity derating, sag & tension, short-circuit (adiabatic) sizing, charging current, geometric R/X/C, sheath voltage, IEC 60287 rating, bending radius, pulling tension
• Overhead Lines — line parameters, surge impedance & SIL, corona (Peek), bundle GMR, skin depth, ground-level E & B fields, ruling span, wind & ice loading, power transfer
• Transformers — impedance base change, full-load current, voltage regulation, efficiency, parallel load sharing, IEC 60076-7 thermal ageing
• Fault Analysis — source & transformer fault levels, series source+transformer fault, unsymmetrical (SLG/LL/LLG) faults, symmetrical-component decomposition, asymmetrical peak (IEC 60909)
• Protection & Safety — IDMT relay timing (IEC 60255), arc-flash energy (Lee & IEEE 1584), CT knee-point, motor & generator fault contribution, breaker TRV, grading margin
• Insulation & Coordination — air clearance, standard insulation levels (IEC 60071), surge arrester rating, creepage, striking distance, rolling sphere, TOV, BIL margin
• Earthing & Soil — IEEE 80 tolerable touch/step voltages, mesh & step voltage, grid resistance (Sverak) & GPR, earth-rod resistance, conductor sizing, Wenner soil resistivity
• Power & Load — three-phase power, power triangle, per-unit, line loss, voltage unbalance, two-bus drop, battery sizing, demand factor
• Power Quality — THD, single-tuned & detuned filters, capacitor bank, motor-start dip, transformer K-factor

REFERENCE DATA
• ACSR conductors, conductor materials, IEC 60071 insulation levels, typical transformer %Z, soil resistivity, adiabatic k-factors, standard ratings

BUILT FOR REAL WORK
• Live results as you type, with the formula shown for every tool
• One-tap PDF calculation sheet — inputs, results, references and date
• Standards-referenced: IEC 60071 / 60076 / 60287 / 60364 / 60909 / 60255, IEEE 80 / 738 / 1584
• Universal app — iPhone and iPad
• A built-in overview explaining what HV systems are and how each tool is used

PRIVATE BY DESIGN
• Everything runs on your device
• No account, no sign-up, no cloud, no tracking

IMPORTANT DISCLAIMER
This app is an educational and preliminary-estimation aid only. All results are approximate first-pass estimates and may rely on simplifying assumptions. They are NOT a substitute for professional engineering judgment and must not be used for construction, procurement, commissioning, operation, protection/relay settings, equipment ratings, earthing/safety design, or any safety-critical decision without independent verification by a qualified, licensed engineer and review against the applicable standards and local codes. The app is provided "as is" without warranty of any kind, and the developer accepts no liability for any loss, injury, death, or damage arising from its use. HIGH VOLTAGE IS LETHAL — all work must follow the applicable safety rules and be performed only by competent, authorised personnel. A full disclaimer must be accepted on first launch.

Download High Voltage Systems Toolkit and carry your HV reference desk with you.


## Version history (last 1 release)

### 1.1 — 2026-06-23

No release notes.

## More apps by Yuhsiu Lai

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All apps by Yuhsiu Lai: https://appshunter.io/developer/433114647

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-07.*