GridCircuits

Free engineering calculators for substation automation, protection & control and transmission engineers. Every tool shows its formula and standard reference (IEEE/ANSI, IEC).

Joined on Nov 4, 2026

GridCircuits

Nov 12

Three-Phase Power: kW, kVA, and Why Power Factor Sits Between Them

#electricalengineering #power #engineering #tutorial

2 min read

GridCircuits

Nov 11

Distance Protection Zones: Why Zone 2 Waits

#engineering #electrical #safety

4 min read

GridCircuits

Nov 10

Arc Flash Incident Energy: Why Working Distance Matters More Than the Label

#engineering #electrical #safety

4 min read

GridCircuits

Nov 9

Power Factor Correction, Worked Out: 500 kW from 0.75 to 0.95 PF

#tutorial #science

2 min read

GridCircuits

Nov 9

Symmetrical Components in Plain English: Fortescue Without the Fog

#tutorial #science

3 min read

GridCircuits

Nov 9

Grounding Conductor Sizing: What the Table Actually Assumes

#tutorial

3 min read

GridCircuits

Nov 8

Analog Scaling in SCADA: 4–20 mA to Engineering Units Without the Guesswork

#automation

4 min read

GridCircuits

Nov 7

Per-Unit Without the Headache: Changing Base in Two Lines

#electricalengineering #powersystems #engineering

2 min read

GridCircuits

Nov 6

Transformer Impedance and Fault Current: A Quick Worked Example

#tutorial #beginners #education #science

3 min read

GridCircuits

Nov 4

IDMT Relay Curves Explained: Picking the Right Curve for Feeder Protection

#energy #hardware #infrastructure

3 min read

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GridCircuits

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Three-Phase Power: kW, kVA, and Why Power Factor Sits Between Them

Distance Protection Zones: Why Zone 2 Waits

Arc Flash Incident Energy: Why Working Distance Matters More Than the Label

Power Factor Correction, Worked Out: 500 kW from 0.75 to 0.95 PF

Symmetrical Components in Plain English: Fortescue Without the Fog

Grounding Conductor Sizing: What the Table Actually Assumes

Analog Scaling in SCADA: 4–20 mA to Engineering Units Without the Guesswork

Per-Unit Without the Headache: Changing Base in Two Lines

Transformer Impedance and Fault Current: A Quick Worked Example

IDMT Relay Curves Explained: Picking the Right Curve for Feeder Protection