(i) What are the causes and disadvantages of low power factor?(ii) A single-phase 400 V, 50 Hz motor takes a supply current of 50 A at power factor of 0.8 lag. Themotor power factor has been improved to unity by connecting a condenser in parallel. Calculatethe capacity of the condenser required.(iii) In a three-phase overhead line, the conductors have an overall diameter of 3.0 cm eachand are arranged in delta formation. Assuming a critical disruptive voltage of 250 kVbetween the lines, an air density factor of 0.90 and mo = 0.95, find the minimum spacingbetween conductors that is allowable. Assume fair weather conditions.

Causes Of Low Power Factor- A poor power factor can be the result of either a significant phase…

Answered: What are the causes and disadvantages…

Engineering

Electrical Engineering

What are the causes and disadvantages of low power factor?

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.33P: Consider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage...

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Concept explainers

Compensation Techniques

The compensation techniques are the methods that are employed in the electrical control systems to enhance the performance of the system. The performance are generally affected by the factors like lag in the compensating devices, slow response of the system of the components like sensors used in the control system. The basic compensation technique involves lag compensation, lead compensation or the combination of the both.

Question

(i) What are the causes and disadvantages of low power factor?
(ii) A single-phase 400 V, 50 Hz motor takes a supply current of 50 A at power factor of 0.8 lag. The
motor power factor has been improved to unity by connecting a condenser in parallel. Calculate
the capacity of the condenser required.
(iii) In a three-phase overhead line, the conductors have an overall diameter of 3.0 cm each
and are arranged in delta formation. Assuming a critical disruptive voltage of 250 kV
between the lines, an air density factor of 0.90 and mo = 0.95, find the minimum spacing
between conductors that is allowable. Assume fair weather conditions.

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