Electrical Engineering

I have never come across a symbol for an electrical resistance box. As the resistance box is a test instrument and it would not be drawn on any electrical schematic there may not be a symbol designated for it. The last letter of the Greek alphabet is (Ω omega) and it is used for the electrical symbol for resistance.

1. Very high power transfer capability.

2. Very high controllability.

The formula you are looking for is 460 divided by the square root of 3 (1.73).

by adding resistance in parallel more current is bound to flow

The cable size depends on a few factors, such as the supply voltage, the method of starting the motor, (direct-on-line, or star delta) and the length of cable required to compensate for voltage drop. Also, if the cable is copper or aluminum.
110 kW motor has a rated current of 200 amps at 415 volts, so the correct copper cable size would have a cross-sectional area of 75 square mm., if the motor is started direct-on-line.
At 660 volts, the rated current would be 118 volts and the cable size would be 35 square mm.

The motor will run, but it will turn slower than the nameplate rating, it will draw more current, it will run hotter than it would have on 60Hz, and it will not ouput the full rated horsepower. Depending on the application and how hard the motor is actually loaded, you might be able to get away with it, but usually not. 220V 60 Hz motors are rare. It is more likely a 208V, 230V or 240V motor. Some motors are actually dual-rated for both 50 and 60 Hz, with corresponding different speed and Amp ratings. Check the nameplate!

ONE THING FOR SURE THERE IS NO CHANGE IN VOLTAGE IF SAME EQUIPMENT WE ARE TALKING ABOUT. THE ISSUE HERE IS THE CHANGING LOAD FREQUENCY 60HZ TO 50HZ OR VICE VERSA. FOR EXAMPLE THE MOTOR HORSEPOWER AND R.P.M. WILL BE APPROXIMATELY 90 AND 83 PERCENT OF THE NAMEPLATE SPECIFICATIONS, ALSO THE FULL LOAD RUNNING TORQUE WILL INCREASE APPROXIMATELY 8 PERCENT IF USED FROM 60HZ TO 50HZ.

I p or current peak

sometimes LRA (locked rotor amps) on the nameplate

kva class F would mean peak current 7 times the running full load current

starting current same thing

different names same idea

For Single Phase,

P = VI cos (theta)

therefore cos(theta) = P/VI

here

P = Power

V = voltage

I = current

theta = phase angle current to voltage

cos(theta) = power factor

For Three Phase,

P = 3VI cos(theta)

where V = phase voltage and I = phase current and theta = phase angle

No. Perhaps an analogy would help understand the answer to this question.

When you are at the store, and you are in a line waiting to be paid, opening up another line or more should increase how fast people can move through the store. That is a parallel operation. (If you have to go through one line at the store and then go through another line at the store, that is a series operation).

Similarly, when a current meets a resistance, putting additional resistance in PARALLEL allows some of the current to divert to this new path or paths, allowing more current to flow through the combination of resistances. Since more current is flowing though the combined resistances, the equivalent resistance is less since less resistance always means more flow.

A DGA (Disolved gas analysis) is needed to identify certain types of damage a transformer may experience.

After a severe fault, a DGA test is often performed to determine whether there might be damage to the transformer, or if it is safe to re-energize.

the source voltage is the voltage that measured exactly after the voltage source , but the terminal voltage is the voltage that measured in the load terminals , which equal to the source voltage minus the drop voltage on the transmission line .

A simple circuit is a circuit containing one voltage or current source in series with, or in parallel with, one load.

Since it is a simple circuit, both definitions, series and parallel, are equivalent and mean the same thing.
well ist a circut that only has one wire and if one power outlet goes out so do the rest and as you can read i can't really find out i was tring to find out and thats not simple because im a 10 year old in 5th grade! (advanced 5th grade)

It is a type of transmission where you can shift forwards to backwards or the other way around with out having to come to a complete like normal tractors have to.

There are two things missing in this question. The period of time the 1000 watts is being used and the price that you are paying for a kWh. If the 1000 watts was left on for an hour it would be 1 kWh. The cost per kWh is still needed, so it can be multiplied the the 1 kWh, to find a cost.

The voltage arrester works by conducting when there is enough voltage to turn it on. Often, an arrester on a primary distribution circuit has a spark gap to ground, so that lightning strikes are limited in voltage, protecting the circuit. Other types of arresters, such as MOV's, can be used in surge protectors.

A series circuit is one that is hooked up one component after another. Think of a baseball club holding hands. A paralell circuit is one in which the components are hooked up while sharing connection points. - Think of a marching squad coming at you all at once.

USE FOR 3 PHASE SUPPLY REQUIREMENT BUT WITH ENGINEERING ECONOMICS BACKGROUND. FOR EXAMPLE YOUR REQUIREMENT IS ONLY 500 KVA AT THE MOMENT BUT HAVE PLANS FOR EXPANSION IN THE FUTURE THEN YOU HAVE TO INVEST ONLY FOR 2 NOS. OF 333 KVA TRANSFORMER CONNECTED LIKE REMOVING ONE LEG OF DELTA SHAPE. YOU WILL HAVE A CAPACITY OF 3 X 333KVA DIVIDED BY SQUARE ROOT OF 3 = 577 KVA(57.7% OF CLOSED DELTA) WHICH SATISFY YOUR PRESENT REQUIREMENT. IN THE TIME YOU WANT TO EXPAND LOAD - JUST ADD ONE UNIT 333 KVA TO BE A CLOSED DELTA IT WILL GIVE YOU 999=1000KVA CAPACITY(42.3% MORE).

First thing, there is nothing like vacuum circuit contactor. It is a vacuum contactor. It has hrc fuse for protection against short circuit and have vacuum bottles in which contacts move to get close and open. It will never trip bcas it does not have tripping mechanism, it does not have operating mechanism. It's contacts are made only to make and break normal current. It is used to start and stop a motor only. It does not have ka rating for fault current.

Vacuum circuit breaker is a real fault current breaker which trips during a fault like short circuit, earth fault, under or over voltage or any one. It encompasses the operating mechanism to break the contacts at a very high speed and also need a spring charging mechanism to turn the breaker on. It has very highly rated contacts inside a heavy capacity vacuum bottles. It has realese ( something like solenoid ) which pulls the plunger after it get signals from various protection relays in case of fault. It is not meant to operate for day to day start and stop operation of motor. It has ka rating for fault current.

Analogus to ordinary home circuit, vcb is like a circuit breaker at home inside a panel and vc is a relay in our any of instruments at home.

Analogus to low voltage situation, vcb is like a fault current ( air, or bulk oil or minimum oil ) circut breaker and vc is like an ordinary contactor

The step up transformer is used to change the voltage from high to low or low to high voltage by eitherincreasing the number of inding or reducing the number of winding in the transformer,thus when the winding reduced on side of primary winding and ingreasing number of winding on secondary side it means the transformer should be step up transfo0rmer,and when the you increase number of turnsin primary side and reduce turned on secondary sidde the transformer said to be step down transformer