Piano Guidance
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What does L1 L2 L3 mean?

L1: effective voltage + Frequency. L2: effective voltage + Frequency + phase shift to L1. L3: effective voltage + Frequency + phase shift to L1.

myelectrical.com - Three Phase Power Simplified - myElectrical
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Three Phase Power Simplified

April 17th, 2012

By Steven McFadyen on

A single phase system is perhaps the most common type of system most people are familiar with. This is what people have in their homes and what appliances are plugged in to. For larger amounts of power, three phase systems are used. Electricity is generated by a coil of wire moving through a magnetic field. The illustration shows three such coils in an electrical generator , spaced evenly apart. Each coil is called a phase and as there are three coils, this is called a three phase system. From a such a system, power can be supplied as single phase (load connected between a line and neutral) or three phase (load connected between all three lines). In the illustration, the motor is connected as a three phase load and the socket outlets and lamp as single phase loads.

Terminology

The three winding end connected together at the centre are is called the neutral (denoted as 'N'). The other ends are called the line end (denoted as 'L1', 'L2' and 'L3'). The voltage between two lines (for example 'L1' and 'L2') is called the line to line (or phase to phase) voltage. The voltage across each winding (for example between 'L1' and 'N' is called the line to neutral (or phase voltage).

Voltage Relationship

The line to line voltage is the vector sum of the phase to phase voltage across each winding. This is not the same as the arithmetic sum and is given by the following equation: Example: Line to Line Voltage (V LL ) Line to Neutral Voltage (V LN )

Solving Three Phase Problems

Tip - to solve a three phase problem, convert it to a single phase problem.

In a balanced three phase system

- each phase delivers/uses 1/3 of the total power

- convert three phase problems to single phase

Resources

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What are the f number keys called?

function keys The function keys or F-keys on a computer keyboard, labeled F1 through F12, are keys with a special function defined by the operating...

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How many hours a day should I practice typing?

Exercising 15-30 minutes daily will be more helpful than two-hour workouts once a week. It is easier to maintain concentration during short exercises, as well as being much easier to carve out time for them. Practice whenever possible and not just with the Ratatype.

ratatype.com - How often should I practice typing exercises? - Ratatype

How often should I practice typing exercises?

As with anything, regularity is the key to success. Strengthening muscle memory takes a lot of practice, and it is important that you exercise regularly. Exercising 15-30 minutes daily will be more helpful than two-hour workouts once a week. It is easier to maintain concentration during short exercises, as well as being much easier to carve out time for them. Practice whenever possible and not just with the Ratatype. Try to practice your touch typing skills while communicating on social media or when performing less urgent work tasks. Typing test is also a practice. Take the test from time to time to see how much your speed has improved.

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