Posts Tagged ‘power flow’

Autotransformers: optimal location & installation

December 6th, 2018 | Make a comment | Posted in Electrical distribution
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In this article you will read about the technical and economic analysis for the optimal location of installation of 2 autotransformers with voltage ratio of 400/110 kV, which are equipped with automatic load regulation.

This article is a feedback from an electrical project. It was written and sent to us by your fellow electrical engineer Mile from Macedonia :) Let’s begin!

Flexible AC transmission system (FACTS)

July 16th, 2013 | 1 Comment | Posted in Power quality
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Through the years there has been an increment in the huge amount of power transfers and third party approaches. Despite the fact, electric power transmission facilities throughout the world are not openly allowed to progress because of the different environmental, land-use and regulatory pressures that arise. As a result upholds in transmission, irregular facility usage, and undesirable parallel pathways or loop movements are being experienced.

When there is an increase in power transfer the operating system becomes difficult to manage ultimately becomes complex. Because of this complexity the control on the system becomes weak and the power transfer can become insecure in case of huge power movements.

Flexible AC Transmission System (FACTS) 1

Another issue arising due to this is that complete capacity of the transmission interconnections is not used.

Electric Power Research Institute (EPRI), a US utility industry dealing in combined research and development arm, has now decided to fund Flexible AC Transmission System (FACTS) technology, a solution for the above mentioned problems.

In FACTS solid state devices are employed to keep in check the transmission systems when there is a huge power flow. EPRI along with researchers have invested in FACTS both in terms of its value and capability. Currently FACTS is focusing mainly on the improvement of transmission potential, figuring diverse ways to control power flow, to control the voltage and to add to the lower voltage systems’ plus points.


Reactive Power Management

July 11th, 2013 | 1 Comment | Posted in Power quality
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Reactive power management 1

In an AC circuit, there is a likelihood of interrupted direction reversal of the energy flow because of the temporary energy storage in inductive and capacitive parts.

The real power is the power flow left after it has been equally distributed in an AC waveform which in actual can be further utilized to do work such as heating an element and to overcome friction in a running motor.

However, the reactive power is the power flow which is due to the inductive and capacitive network elements; it is first temporarily stored and then returned back to its origin.

Inductors consist of a large coil and are devices which have the capability to store energy in form of magnetic field. On application of voltage, magnetic field is produced across the coil and after some time the current attains its full value. The voltage, so, surpasses the current in phase. Such devices are said to be the ones absorbing reactive power.

Energy storage in form of an electric field is the work of a capacitor. Full voltage difference is reached in some time until a charge is built up when the current is driven through the capacitor. As a result, fluctuation in voltage through the capacitor is observed which is opposed by it causing the voltage to fall behind current in this case. This is therefore referred to as the generation of reactive power because the voltage experiences drop back from current this time.

Reactive power flow occurs due to the energy storage in network inductive and capacitive elements. Voltage level is greatly affected by the reactive power flow throughout the network. As a result there is a need to properly monitor and manage the voltage level and reactive power flow so that the network operation is held within appropriate limit.


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