--- title: "Power Systems & Motors Articles: Power Factor, Delta Connection and Star–Delta" url: https://modsengineeringmath.com/en/blog/category/power-motors/ site: "Mod's Engineering Mathematics (อาจารย์มด)" language: en updated: 2026-10-25 --- > Articles on power systems and motors: what power factor is, sizing a correction capacitor, connecting a three-phase motor in delta, and setting a star–delta timer, with real 400 V 50 Hz numbers. Markdown copy of https://modsengineeringmath.com/en/blog/category/power-motors/ for AI assistants and search tools. Math is LaTeX ($…$ and $$…$$); interactive labs and figures are only on the web page. # Power Systems & Motors Articles: Power Factor, Delta Connection and Star–Delta THภาษาไทยENEnglish // Article category · 4 articles Electrical work in factories and buildings, from power factor and the penalty on the bill to choosing a capacitor and connecting and starting three-phase motors. Every article uses the numbers of a 230/400 V 50 Hz system. ✎All 24ΣSequences & Series 7[A]Vectors & Linear Algebra 7ℒLaplace Transform 3PIDControl Systems & PID 23φPower Systems & Motors 4Programming & AI 1 ## All articles in Power Systems & Motors Motors · research How Many Seconds Should a Star–Delta Timer Be Set To? Numerical Experiments on a Squirrel-Cage Induction Motor: Changeover Time, Dead Time, Current and Energy How many seconds for a star–delta timer? Research simulating a 7.5 kW squirrel-cage motor: t = c·τm, a c table by load, dead time, KM3 phase order,… 19 Oct 2026Read the article → 3-phase motors 3-Phase Motor Delta (Δ) Connection: Remember U1–W2, V1–U2, W1–V2 and Choose from the Nameplate How to connect a 3-phase motor in delta: links U1-W2, V1-U2, W1-V2, what U1 V1 W1 U2 V2 W2 mean and which wire colours go where, line vs phase… 17 Oct 2026Read the article → Power factor How to Calculate the Size of a Power Factor Correction Capacitor (kvar) with an Example The formula Qc = P(tan φ1 − tan φ2) with a 100 kW, 400 V load corrected from PF 0.75 to 0.95 giving 55.3 kvar, microfarads per phase, a multiplier… 16 Oct 2026Read the article → Power factor What Is Power Factor? The cos φ Formula and the Relationship between kW, kVA and kvar Power factor is the ratio of real power to apparent power. See the P Q S power triangle, a worked current calculation at PF 0.8 versus 1.0, lagging… 16 Oct 2026Read the article → // Keep reading ## Go deeper in the lessons Power factor (Thai) → Motor control (English edition available) AC induction motors (Thai) All articles