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# Three Phase AC Circuits

## What is the Difference Between Neutral, Ground and Earth?

The Main difference between Neutral, Ground and Earth? ‪To understand the difference between Neutral, Ground and Earth, we must understand the need of these things first. Neutral Neutral is return path for an AC circuit which is supposed to carry current in normal condition. This current may be because of many reasons, primarily because of phase current imbalance and some …

## Star and Delta Connected Lighting Loads

Star and Delta Connected Lighting Loads – Electrical Wiring Installation Star (Y) Connected Lighting Load – Electrical Wiring A Star connected (Three Phase Four wires or 3-Phase, 4 wires) lighting system in a multi-storey (three Storey) building is shown in fig a. for uniform load distribution among three phases without being affected by random switching ON and OFF or burning lamps …

## Comparison between Star and Delta Connections

Comparison between Star and Delta Connections Comparison between Star (Y) and Delta (Δ) Connections Star (Y) Connection Delta (Δ) Connection In STAR connection, the starting or finishing ends (Similar ends) of three coils are connected together to form the neutral point. A common wire is taken out from the neutral point which is called Neutral. In DELTA connection, the opposite …

## Delta Connection (Δ): 3 Phase Power, Voltage & Current Values

Delta Connection  (Δ) In this system of interconnection, the starting ends of the three phases or coils are connected to the finishing ends of the coil. Or the starting end of the first coil is connected to the finishing end of the second coil and so on (for all three coils) and it looks like a closed mesh or circuit …

## Star Connection (Y): Three Phase Power, Voltage & Current Values

Star Connection (Y) In this kind of interconnection, the starting ends or finishing ends (Similar ends) of three coils are connected together to form the neutral point. Or Star Connection is obtained by connecting together similar ends of the three coils, either “Starting” or “finishing”. The other ends are joined to the line wires. The common point is called the …

## Three Phase Current Values in a 3-Phase System

Three Phase Current Values in a 3-Phase System The following points may be noted for understanding the division of Three Phase Current in a 3-Phase System       1.  The arrow symbols shown alongside three phase current (IR, IY and IB) in fig 1 and 2 does not indicate the currents directions in a particular moment but shows the current directions …

## Rated characteristics of Electrical Contactors

Rated characteristics of Electrical Contactors Click image to enlarge 1. Types: (i) Electromagnetic (ii) Electro-pneumatic (iii) Pneumatic Important Terms and Definitions related to Motor Control and Protection 2. Interrupting Medium: (i) Air (ii) Oil (iii) SF6 gas (iv) Vacuum Abnormal Operating Condition and Causes of Induction Motors 3. Rated values of voltages: (i) Rated voltage (Operational voltage) For a three …

## Single Phase & Three Phase Wiring Diagrams (1-Phase & 3-Phase Wiring)

5.   Single Phase & Three Phase Wiring Diagrams (1-Phase & 3-Phase Wring) The Star-Delta (Y-Δ) 3-phase Motor Starting Method by Automatic star-delta starter with Timer. How To Wire a Single Phase kWh meter (Digital or Analog Energy Meter) from the Supply to The Main Distribution Board (MDB)? How To Wire a 3-Phase kWh meter from the Supply to The Main …