A transformer is a static electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. It can step voltage up or down while proportionally changing the current, making it the cornerstone of all modern electrical power distribution systems.
How Does a Transformer Work?
flowchart LR A["⚡ AC Input Primary Winding (N₁ turns)"] -->|"Alternating current creates"| B["🔁 Alternating Magnetic Flux in CRGO Core"] B -->|"Flux induces voltage in"| C["Secondary Winding (N₂ turns)"] C --> D["⚡ AC Output V₂ = V₁ × N₂/N₁"] note1["Step UP: N₂ > N₁ Step DOWN: N₂ < N₁"] -.-> D
The fundamental equation is:
V₁/V₂ = N₁/N₂ = I₂/I₁
Where V = voltage, N = number of winding turns, I = current.
- Step Up Transformer: N₂ > N₁ → Output voltage is higher, output current is lower
- Step Down Transformer: N₂ < N₁ → Output voltage is lower, output current is higher
Types of Transformers
Step Up Transformer
Increases voltage from primary to secondary. Used in power stations to step voltage up to 33kV, 132kV, or 400kV for long-distance transmission.
Step Down Transformer
Decreases voltage from primary to secondary. Used in distribution networks to bring high transmission voltage down to usable levels (415V, 230V).
Isolation Transformer
1:1 ratio transformer where the primary purpose is to electrically isolate two circuits, not to change voltage. Used for safety, noise filtering, and medical equipment.
Auto Transformer
Uses a single tapped winding shared between primary and secondary. More efficient and compact, but does not provide isolation. Used in servo stabilizers (variac) and motor starters.
Step Up vs Step Down Comparison
| Feature | Step Up | Step Down |
|---|---|---|
| Voltage | Low → High | High → Low |
| Winding Turns | Secondary > Primary | Primary > Secondary |
| Current | Output current lower | Output current higher |
| Common Use | Power transmission, voltage boost | Power distribution, equipment adaptation |
Key Components
graph TD T[Transformer] --> Core[CRGO Silicon Steel Core Low hysteresis loss] T --> PW[Primary Winding Copper conductor] T --> SW[Secondary Winding Copper conductor] T --> Ins[Insulation Class F or H] T --> Tank[Tank & Cooling Oil or Air cooled] T --> Term[Terminals & Bushings]
ServoKai Custom Transformers
ServoKai System manufactures custom step up transformers, step down transformers, isolation transformers, and auto transformers in single phase and three phase configurations from 1 kVA to 500+ kVA. All units use CRGO-grade core material and precision copper windings. Request a custom transformer quote →