What Is Three-Phase Power?
Three-Phase Power is an alternating-current electrical supply that uses separate electrical waves to deliver power. The waves reach their peaks at different times, creating a steady flow of energy to connected equipment. This type of supply is common in commercial buildings and is well suited to large motors.
Quick Facts About Three-Phase Power
- Category
- Alternating-current supply
- Used for
- Commercial motors and equipment
- Common confusion
- Not present in every commercial building
- Also called
- Three-Phase Electricity
- Often discussed with
- Commercial Electrical Repair, Electrical Troubleshooting
Key Takeaways About Three-Phase Power
- The supply differs from single-phase power.
- Equipment must match the available supply.
- A commercial building doesn't always have this supply.
How Three-Phase Power Works
Three-phase power works through alternating electrical waves that are timed apart. As each wave rises and falls, the others are at different points in their cycles. This timing helps a motor turn smoothly under load. Related service: Commercial Electrical Repair.
Related glossary terms: Electrical Load, Transformer, Neutral Wire.
A transformer can change the supply voltage to suit the equipment served. The wiring arrangement depends on the supply and the equipment's needs. Some arrangements include a neutral wire for certain loads.
Motors use the supply to create a rotating magnetic field. That field turns the motor shaft and drives equipment such as a pump. The motor's nameplate identifies the supply it needs, so you can compare it with the building's electrical system.
From the Electrician Pittsburgh team
When we handle commercial electrical repair, we check the equipment's nameplate against the supply. We also look for signs of trouble at connections and controls. A motor problem may start outside the motor, so we trace the circuit before choosing a repair.
Three-Phase Power in Practice: A Real-World Example
A commercial building's pump motor stops running. During the electrical repair, a technician checks the supply and finds a loose connection at the motor control.
Related Terms
Electrical Load
Electrical load is the amount of electrical power that a device or group of devices draws from a circuit.
Transformer
A transformer is an electrical device that changes alternating current voltage through a magnetic field.
Neutral Wire
A neutral wire is a circuit conductor that carries current back toward the electrical supply during normal operation.
Circuit Breaker
A circuit breaker is an electrical protection device that stops current when a circuit draws too much power or develops a short.
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