Electrical Engineering

415V

commonly available wire is 300V or 600V

so that would need to be 600V wire

to use a megger or a hipot tester

(2* operating voltage +1000V)

2000 volt megger or hipot should verify the wiring in this instance

2500v megger will be necessary for 600V wire and wiring devices

you also must look and ambient temperature and humidity

a test after some operation time can verify this

Capacitive voltage transformer (CVT) which is having special properties & used for protection & metering purpose.

The major causes of loss of excitation on generators are due to an open circuit or a short circuit in the field winding. This may also be caused by a breakdown of the insulation system.

To avoid inteference between communication lines

A 'voltage' is another name for a potential difference. As the name implies, a potential difference exists between two different points or, in the case of an electrical installation, between the line conductor and the neutral conductor. So the neutral does not 'import voltages'. Voltages exist between the line (hot) conductor and the neutral conductor.

i want to know about the advantage and disadvantages

Pulmonary disease pattern

75/125 = 0.6 Ampere

Spacers insulate the transformer tank from the mechanical vibrations of core & the windings.this results in reduced noise emisions.

yes.it is possible to start dc series generator on no load condition

If it is a series motor it may still work. If it is a shunt motor it will not work , it will produce a humming noise and get heated. The shunt fields normally have high reactance so the field current will be drastically reduced, which may not be able to create the requisite torque.

In North America, a transformer's terminals are marked with a combination of letters and numbers. The letter 'H' represents the higher-voltage terminals, while the letter 'X' represents the lower-voltage terminals. Odd numbers (1, 3, etc.) represent the 'start' of a winding, while even numbers (2, 4, etc.) represent the 'end' of a winding.

If the potential difference across terminals X1 - X2 is in phase with the potential difference across H1 - H2, then the transformer is described as having 'additive polarity'; otherwise, it has 'subtractive polarity'.

'Multimeter' and a 'VOM meter' are different terms for exactly the same thing -a meter that can be used to measure voltage, current, and resistance. These meters can be either analogue or digital. Analogue instruments are now being priced out of the market by digital meters, due to the manufacturing costs of analogue instruments. Digital meters are more rugged and easier to read than analogue instruments, but not necessarily more accurate.

Power Factor is a maximum of one when the voltage and current in an AC waveform are in phase. Since power in watts is equal to voltage x current x power factor, you get maximum wattage with power factor = 1. This occurs with a pure resistive load. When you power an inductive load like a motor the power factor decreases and so does the delivered power. That is why motors are typically rated in VA, or volt-amperes rather than watts. So y Ou can assume power factor = 1 when you have a load measured in watts like a light bulb or space heater and perhaps in the .75 range for an inefficient motor.

Where is the sand box

A change in current causes a voltage to be induced into an inductive circuit, which opposes that change of current. This is because the change in current is accompanied by a change in magnetic flux which 'cuts' the conductors and induces a voltage into them.

1.7 volts

voltage can carry current a further distance.

FLA: Full Load Ampere.

Its the current drawn by the motor when the motor is running at full load

FLA = kW / (1.732*V*pf*efficiency*100)

It enables an existing transformer to be upgraded to meet an increase in load, without having to remove that transformer and replace it with a 'larger' (expressed in volt amperes) one. It provides an useful way of using up a stock of smaller transformers.

Inductive load where current lags voltage to keep the power factor low thus increasing the consumption of more electrical units of supply provider. This is since an inductive load draws reactive power as well with active power. Reactive component is watt less power drawn from the source. We use only active part of the source. But pays from active+reactive parts. This low power factor also effects the other systems in the circuit virtually making the cables under sized by heating them

First remember this rheostat is connected in series with the armature to increase the total resistance to limit the starting current, thus achieving max starting torque from the motor

starter is used in dc motor to reduce the initial starting torque...so that the dc machine could be protected from damage....

..and to avoid max ..current flowing ..from it it can damage whole ..moter structure

(r+(c/2))