What are the power quality disturbance?

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asked Mar 10, 2018 by anonymous

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Explain energy conservation technique “by improving power quality” for induction motor.

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asked Apr 29, 2018 by anonymous

During a disturbance on a synchronous machine, the rotor swings form A to B before finally setting down to

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Last answer: During a disturbance on a synchronous machine, the rotor swings form A to B before finally setting down to steady state at point C on the power angle curve. The speed of the machine during oscillation is synchronous at point(s) only at C

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Quality control is aimed at:

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Last answer: Quality control is aimed at: a. Maintaining the desired quality b. Exceeding the desired quality c. Continuously improving the quality d. Following the quality

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Last answer: It is unity power factor but difficult to achieve in dynamic loads

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Last answer: Reduced copper losses Smaller conductor size Improve voltage regulation Increase system capability Less energy bill

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What can you do to prevent a power surge?

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Last answer: If your neibour / other flat owners / your maintainer staff switch on any type of inductive load that can cause power surge / dip

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What is meant by power dip?

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Can you have a power factor greater than 1?

Last answer: We cannot have power factor greater than 1. As it is a measure of cosine of angle between voltage and current.

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Why do we need to correct power factor?

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asked Mar 10, 2018 by anonymous

How do you measure power factor?

Last answer: P= 1.83*V*I*COS@ where P is power V is voltage I is current COS @ is P.F COS@= P/(1.83*V*I) in other way cos @ = true power/apparent power

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Can a power surge erase a hard drive?

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How often do power surges occur?

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What are interconnected power system?

Last answer: Interconnected power systems are those which connect different geographic regions. In Australia we have a National Electricity Grid which connects 6 states. Transfers of power occur between the states depending ... make more profit from this.National-Electricity-Market-Fact-Sheet.pdf (0,9 MB)

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asked May 8, 2018 by anonymous

Two 100W, 200V lamps are connected in series across a 200V supply. The total power

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asked May 8, 2018 by anonymous

The main disadvantages of having poor power factors are:

The main disadvantages of having poor power factors are: (A) High cost of station and distribution equipment (B) Poor voltage regulation (C) High energy loss in conductor (D) All of the above

Last answer: The main disadvantages of having poor power factors are: (A) High cost of station and distribution equipment (B) Poor voltage regulation (C) High energy loss in conductor (D) All of the above

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asked Apr 28, 2018 by anonymous

If non-linear loads are connected to the power system, then

If non-linear loads are connected to the power system, then (A) displacement power factor is same as the total power factor (B) displacement power factor is not equal to the total power factor (C) displacement power factor is due to harmonic currents (D) total power factor is due to fundamental component of current

Last answer: If non-linear loads are connected to the power system, then displacement power factor is not equal to the total power factor

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asked Apr 28, 2018 by anonymous

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are

The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is (A) zero (B) 0.5 (C) between zero and 0.5 (D) between 0.5 and unity

Last answer: The power consumed by a balanced 3-ph load is measured by two-wattmeter method. The meter readings are 8 kW and 4 kW. The power factor of the load is between 0.5 and unity

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asked Mar 21, 2018 by anonymous

The power factor of a single phase load can be calculated if the instruments available are?

Last answer: The power factor of a single phase load can be calculated if the instruments available are three ammeters or three voltmeters.

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asked Mar 21, 2018 by anonymous

In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at?

Last answer: In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at 120°.

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asked Mar 20, 2018 by anonymous

The standard full-load power factor ratings for synchronous motors are?

Last answer: The standard full-load power factor ratings for synchronous motors are unity or 0.8 leading.

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asked Mar 20, 2018 by anonymous

In a distribution system, in order to improve power factor, the synchronous capacitors are installed?

Last answer: In a distribution system, in order to improve power factor, the synchronous capacitors are installed at the receiving end.

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asked Mar 20, 2018 by anonymous

For the protection of power station buildings against direct strokes the requirements are?

Last answer: For the protection of power station buildings against direct strokes the requirements are interception, conduction and dissipation.

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asked Mar 20, 2018 by anonymous

To protect most of the electrical equipment handling low power, the types of relays used are?

Last answer: To protect most of the electrical equipment handling low power, the types of relays used are thermocouple, electronic and bimetallic.

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asked Mar 20, 2018 by anonymous

The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to?

Last answer: The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to extinguish the arc.

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136 views 1 answer

What are the power quality disturbance?

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