Three-Phase Circuits

These flashcards cover key vocabulary, definitions, and concepts related to three-phase circuits as discussed in the lecture notes.

Three-Phase Circuit

A configuration using three conductors to transmit electrical power, predominantly used for energy generation and transmission.

Balanced Three-Phase System

A system where each phase has equal voltage magnitudes and frequency, and are phase-shifted by 120 degrees.

Delta Connection

A method of connecting three-phase loads where the ends of each load are connected in a triangular configuration.

Wye Connection

A method of connecting three-phase loads where each load is connected to a common point, forming a Y shape.

Complex Power

The total power supplied to a circuit, represented as the sum of real power and reactive power in complex notation.

Voltage Phase Shift

The phase difference between voltages in a three-phase system, typically noted as 120° for balanced systems.

Line-to-Line Voltage

The voltage measured between any two phase conductors in a three-phase system.

Instantaneous Power

The product of voltage and current at any given moment, which varies over time in AC circuits.

Power Factor

The ratio of real power flowing to the load to the apparent power in the circuit, indicating efficiency.

Phase Sequence

The order in which the phases reach their peak voltage values in a three-phase system, either positive (abc) or negative (acb).

Neutral Conductor

A conductor that provides a return path for current in a three-phase system, often grounded for safety.

Single-Phase Equivalent Circuit

A simplified circuit representation of a three-phase system, used for easier analysis, usually considering one phase.

Impedance Transformation

The mathematical process of converting between delta and wye configurations to analyze circuit behavior.

Instantaneous Voltage

The voltage value at a specific time instance in an AC waveform, typically represented in sinusoidal form.

RMS Voltage

The root mean square voltage, a measure of the effective voltage of an AC signal that represents equivalent DC power.

Phasor Diagram

A graphical representation of the relative magnitudes and phase of alternating currents and voltages.

Total Apparent Power

The total power in a system, expressed in VA (volt-amperes), encompassing both real and reactive power.