**Three**-

**phase**electric

**power**is a common method of alternating

**current**electric

**power**generation, transmission, and distribution. It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer

**power**. It is also used to

**power**large motors and other heavy loads.

Also question is, why do you need 3 phase?

It is also

**used**to power large motors and other heavy loads. A**three**-wire**three**-**phase**circuit is usually more economical than an equivalent two-wire single-**phase**circuit at the same line to ground voltage because it uses less conductor material to transmit a given amount of electrical power.What is the difference between single phase and three phase?

In electrical engineering,

**single**-**phase**electric power is the distribution of alternating current electric power using a system in which all the voltages of the supply vary in unison.**Single**-**phase**distribution is used when loads are mostly lighting and heating, with few large electric motors.1

## What is two phase and three phase electricity?

Dual

**Phase**or Split**Phase power**is also Single**Phase**because it's a**two**wire Alternating Current (AC )**power**circuit. In the US, this is the standard household**power**arrangement with**two**(**Phase**A,**Phase**B) 120V**power**wires (180 degrees out of**phase**with one another) like**two**bicycle pedals and one neutral wire.2

## What is a two phase system?

**Two**-

**phase electrical power**was an early 20th-century polyphase alternating current

**electric power**distribution system.

**Two**circuits were used, with voltage

**phases**differing by one-quarter of a cycle, 90°. Usually circuits used four wires,

**two**for each

**phase**.

3

## What is a dual phase?

**Dual**-

**phase**steel (DP steel) is a high-strength steel that has a ferriticâ€“martensitic microstructure. DP steels are produced from low or medium carbon steels that are quenched from a temperature above A

_{1}but below A

_{3}determined from continuous cooling transformation diagram.

4

## What is split phase power?

A

**split**-**phase**or single-**phase**three-wire system is a type of single-**phase**electric**power**distribution. It is the AC equivalent of the original Edison three-wire direct-current system.5

## What is a split phase electric motor?

A capacitor start

**motor**is a**split**-**phase induction motor**with a starting capacitor inserted in series with the startup winding, creating an LC circuit which produces a greater**phase**shift (and so, a much greater starting torque) than both**split**-**phase**and shaded pole**motors**.6

## Why is a step down transformer necessary?

As a

**step**-**down**unit, this**transformer**converts high-voltage, low-current power into low-voltage, high-current power. The larger-gauge wire used in the secondary winding is**necessary**due to the increase in current. The primary winding, which doesn't have to conduct as much current, may be made of smaller-gauge wire.7

## Why high voltage can reduce power loss?

Transmission

**losses**are due to current flowing in the conductors. The**higher**the currents the**higher**the**loss**is. So in order to**reduce losses**and have better efficiency transmission is done at**lower**currents. Overall**power**should be same so as**power**=**Voltage***current when the current is low the**voltage**is**high**.8

## Why does the current decrease when voltage increases?

It says that

**Current**inversely proportional to the**voltage**if power remain same. as we know that in**Transformer**, If power remain same, and**voltage increase**, then**current decreases**in Step Up**Transformer**. also**Voltage decreases**when**current increases**as in Step Down**Transformer**.9

## Why does voltage increase current?

Ohm's law states that the electrical

**current**(I) flowing in an circuit is proportional to the**voltage**(V) and inversely proportional to the resistance (R). Therefore, if the**voltage**is**increased**, the**current**will**increase**provided the resistance of the circuit**does**not change.10

## What happens to the current when you reduce the voltage?

This equation, i = v/r, tells us that the

**current**, i, flowing through a circuit is directly proportional to the**voltage**, v, and inversely proportional to the resistance, r. In other words,**if**we increase the**voltage**, then the**current**will increase. But,**if**we increase the resistance, then the**current**will**decrease**.11

## What happens to the current If you decrease the voltage?

Ohm's law states that the electrical

**current**(I) flowing in an circuit is proportional to the**voltage**(V) and inversely proportional to the resistance (R). Therefore, if the**voltage**is increased, the**current**will increase provided the resistance of the circuit does not change.12

## Why Does voltage drop occur?

The current passes through the conductor (wire) from the DC source to the first resistor; as this

**occurs**, some of the supplied energy is "lost" (unavailable to the load), due to the resistance of the conductor.**Voltage drop**exists in both the supply and return wires of a circuit.13

## What is voltage drop in a series circuit?

Notice the voltage drops across each resistor, and how the sum of the voltage drops (

**1.5**+ 5 + 2.5) is equal to the battery (supply) voltage:**9 volts**. This is the third principle of series circuits: that the supply voltage is equal to the sum of the individual voltage drops.14

## How Does voltage drop occur?

Wires carrying current always have inherent resistance, or impedance, to current flow.

**Voltage drop**is defined as the amount of**voltage loss**that**occurs**through all or part of a circuit due to impedance. This condition causes the load to work harder with less**voltage**pushing the current.15

## What is a voltage drop test used for?

VOLTAGE DROP TESTING CAN ALSO BE USED TO DETECT CURRENTS IN CIRCUITS. When current

**flows**through a circuit, it creates heat. And heat**increases**resistance. A voltage drop test can be used to detect current flowing in a circuit by**measuring**voltage drop across the fuse that protects that circuit.16

## What is the acceptable amount of voltage drop?

A footnote (NEC 210-19 FPN No. 4) in the National Electrical Code states that a

**voltage drop**of 5% at the furthest receptacle in a branch wiring circuit is**acceptable**for normal efficiency. It also means that the circuit has a resistance that does not exceed 0.4 ohms.17

## What percentage of voltage drop is acceptable?

Example: What is the minimum NEC recommended operating voltage for a

**120 volt**load that is connected to a 120/240-volt source, Figure 3 (8-11). Answer: (c) 114 volts The maximum conductor voltage drop recommended for both the feeder and branch circuit is 5 percent of the voltage source;**120 volts**x 5% = 6 volts.18

## Is there a voltage drop over a capacitor?

Although the

**voltage drops across**each**capacitor**will be different for different values of capacitance, the coulomb charge**across**the plates will be equal because the same amount of current flow exists throughout a series circuit as all the**capacitors**are being supplied with the same number or quantity of electrons.19

## Why the voltage between 3 phase is 415?

The

**voltage**between**phase**and neutral is called**phase**voltaltage.The**voltage**betwee two line is called line**voltage**.**3 phase**system is expressed with line**voltages**. The line votage is 440**volt**. Also the**voltage**between any one**phase**and neutral for a**3 phase**system is 240**volts**.20

## How many volts is a 3 phase?

**380/220 volts**, 3 phase. If you have

**380/220 volts**and 3 phase power (like a lot of foreign countries), the kiln will come with a 4-wire powerblock for the 3 hot wires that give 3 phase and one neutral wire. Between each hot wire,

**380 volts**can be measured.