Posts Tagged ‘power system’

Top 10 causes for power system failures (part2)

June 18th, 2015 | Make a comment | Posted in Electrical distribution
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Part 1 was about pure electricity, now discover the other causes which are quite surprising!

Tree Contact

power-system-failures-tree-contactTrees that grow very near to the electric poles can pose a lot of threats. They can fall on vital electrical erections during heavy storms, drop branches on conductors, couple two conductors together and can also provide access to various animals that can cause disturbances to the power supply.

This is the reason why most power distribution companies invest a lot of time and money in trimming dangerous trees as a part of preventive maintenance.

When a wet tree branch connects two conductors, current flows for one conductor the other, through the branch slowly.
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Top 10 causes for power system failures (part1)

June 15th, 2015 | 2 Comments | Posted in Electrical distribution
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Top 10 Causes For Power System Failures pt1

Hi everybody, it’s Steven Mill! Today I come to you with a 2 part articles about power system failures.

It is very important to understand the reasons behind these, if you were to understand the root causes that govern the reliability of a power system.

This article deals with all those important reasons on which the reliability of a power system depends.

Following are the top 10 causes for power system failures:

  1. Cables laid beneath/Underground cables
  2. Transformer breakdowns
  3. Lightning
  4. Tree Contact
  5. Birds
  6. Squirrels
  7. Snakes
  8. Insects
  9. Bears and cattle

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Residential Solar Power

August 8th, 2014 | 1 Comment | Posted in Energy Efficiency - solar
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Andrei is very interested in integration of green technologies in residential areas. So we weren’t surprised to see his next article about solar power in residential applications. Enjoy!

Introduction

Solar Power Technology is mature enough to bring great benefits in many regions of the world. I’m sure by now we all know these benefits, smaller electricity bill, endless energy supply, green technology.

As an electrician you might have clients asking you about solar power so it’s best to known a bit about it and what is required for such an installation in order to provide a good answer.

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Usefulness and shortcomings of the power system contingencies

August 14th, 2013 | Make a comment | Posted in Power quality
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Results and Use

Usefulness and shortcomings of the power system contingencies 1

CA results of each element of the power system being studied are evaluated against the safe operation and stability limit for that element.

All the violations are recorded in the form of a list and ranked as per the severity of the situation with the highly overloaded elements on the top of the list.

The major and immediate attention requiring problems are usually covered up in the first 50 violations of the list.

For some elements there can be two limits, one short term and the other long term thermal limit. An example is the effect of the ambient temperature and the overload duration on the operating limits of the transformer and transmission lines within the safe range.

Depending on the operating state and the configuration of the power system whether the load being light, medium or heavy, stability limits can also be present for lines and interconnections. For CA to check these limits it is required by the user to select these options.

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Power System contingencies

August 9th, 2013 | Make a comment | Posted in Power quality
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Introduction

The security of a power system is very important to be evaluated to make sure whether the system will continue working in case one or more element stops to function properly.

Power system contingencies 1

Contingency analysis (CA) is one such evaluating program which separates the Energy Management System (EMS) from a SCADA system which is a level low in complexity. It checks the system for overloads and other problems arising from a contingency.

Contingency can be defined as the non-functionality in the power system of a device such as generator, transformer, transmission line and more or the change of the device state which may include the possibility in a transformer substation of an unplanned opened circuit breaker.

The purpose of the contingency plan is to check the change in the functioning of the device that will occur after the fault element is removed.

There are three levels of problems in case a contingency occurs:

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