Category
Motors, transformers & generators
Start with ideal transformer ratio calculations. Each tool states its assumptions and engineering limits.
Transformer results use an ideal magnitude model and do not evaluate impedance drop, vector-group phase shift, protection or code compliance.
Browse 9 calculatorsTOPIC-01
Search intent
Use this page for the ideal turns-to-voltage ratio and for percent voltage regulation from a declared per-unit series model.
The URL stays /categories/motors-transformers-generators/. The hub also lists generator sizing and motor current, speed, slip and torque. Those calculators are not transformer-ratio models. A second topic URL is not published.
What the model explains
Winding-phase voltages follow the turns ratio. A wye line-to-line entry is converted by 1/sqrt(3) before the ratio; a delta line-to-line entry is the winding voltage.
Regulation uses a series resistance and reactance on one per-unit base. The worked point is full load, 0.8 lagging, 2% resistance and 4% reactance: magnitude sqrt(1.082) per unit.
Engineering use
Check an ideal ratio before anyone treats it as a loaded voltage.
Put a stated R and X into the regulation model and read the sign for lagging versus leading. Stop there: taps, protection and vector group are outside both models.
Questions this hub answers
Does the turns ratio include impedance drop?
No. The ratio model is an ideal magnitude relation. Regulation is the separate per-unit series estimate.
Are motor and generator tools part of the transformer result?
They are listed on this same hub. Each tool keeps its own formula and does not feed the transformer ratio.
Is a regulation percent a standards test?
No. The source is a course-note PDF used as model context. Equipment compliance is not evaluated.
Catalog path
Tools for this subject.
9 calculators available now. Choose the estimate that matches your question.
Transformer Ratio Calculator
Calculate ideal transformer turns and voltage ratios.
OpenTransformer Voltage Regulation Calculator
Interactive estimate with formula evidence and visible boundaries.
OpenGenerator Capacity and Starting Load Calculator
Interactive estimate with formula evidence and visible boundaries.
OpenTransformer Capacity, Loading and Losses Calculator
Interactive estimate with formula evidence and visible boundaries.
OpenThree-Phase Motor Current and Starting Analysis
Interactive estimate with formula evidence and visible boundaries.
OpenSynchronous Speed Calculator
Interactive estimate with formula evidence and visible boundaries.
OpenMotor Slip Calculator
Interactive estimate with formula evidence and visible boundaries.
OpenMotor Torque Calculator
Interactive estimate with formula evidence and visible boundaries.
OpenTransformer Full-Load Current Calculator
Interactive estimate with formula evidence and visible boundaries.
OpenRelated engineering topics
These tools support engineering estimates. Standards compliance, conductor ampacity, installation corrections, and protection coordination are not evaluated unless a future tool says otherwise.