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Electrical Dangers for Human

March 25th, 2012 by admin No comments »

sinotech.org – Have you ever been shock by the flow of electricity, which has a voltage of 220V? If yes! Certainly very surprising.

Even some cases of electrical shock can result in death. Why 12 Volt power supply voltage on the accumulator do not sting and dangerous to humans? Because the human body has a safety limit for electricity, some studies say up to 50 miliampere (mA) electric current, is the safe limit for humans.

The heart as an organ of the body most vulnerable to the influence of electrical current flow and there are four boundaries if we are exposed to electric shock.

Region 1 (0.1 to 0.5 mA), the heart is not affected at all even in the long term.
Region 2 (0.5 to 10 mA), the heart reacts and tingling appear on the surface of the skin. Above 10mA to 200mA, the heart resistant to a maximum period of 2 seconds.
Region 3 (200 up to 500mA), heart felt a strong shock and pain, if the past 0.5 seconds into the danger area.
Region 4 (above 500mA), the heart will be broken and can permanently damage the circulatory system and even result in death.

AC power source, current flows into the human body at Ik, past the prisoner’s hand touch, Ruth, RKI human body, and the prisoners Ru2 footrest. Prisoners of the average human body Ώ 1000, the current that is safe for the human body is a maximum of 50mA, then the magnitude of touch voltage is equal to:

UB = Rk. Ik = 1000 Ώ x 50 mA = 50 V

Well…! all been answered why the accumulator voltage 12V do not sting when we held positive terminal and negative terminals, because the human body just feel the influence of electrical voltage is above 50V.

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Tags: Electric Human Error

Open Source Saves Electricity Supply in Australia

March 21st, 2012 by admin No comments »

sinotech.org – A virus infects a network of computerized systems in the Integral Energy, and managed to spread to computers in the control room operator. But swiftly, the technicians replace computers that are based on Windows that infected, with a Linux-based computers. The spread virus successfully prevented, and once again the open source (Linux) successfully demonstrated its advantages.

The story above is not a figment or myth about open source but a real incident that occurred in Australia. Integral Energy is the second largest of electrical provider in Australia. Concerns about virus attacks, hacker, or cyber terrorists from another country that would attack the country’s vital object have been the concern of some in the Australian government. In fact, they are also concerned about the use of Windows in infrastructure that is critical and vital.

In this integral Energy case, it turns out a lot of Windows-based computers in the network of Integral Energy which had been infected with the virus and must be rebuilt.

I hope the experience from another countries serve as a lesson for managers of existing power plants across the country in the world, especially those already integrated control system and Windows-based computers that are used. Because it is possible, it occurs also in some countries, due to disappointment over the performance of electrical companies, as the sole operator of electrical energy in a country, which is considered by most people, are still not able to provide electrical energy as needed.

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Posted in Electric

Tags: Electricity Supply

Avoiding Interference Electrical Cable

March 19th, 2012 by admin No comments »

sinotech.org – Such as companies of telecommunications , the electric utilities also has a cable that stretched across the globe. The difference, the electric company has a network of electrical wires that reach more places, rather than fiber optics which is owned Telecommunications Company. This fact, obviously make electrical Cable as the vehicle with the best potential to provide the Internet connections to some places that not reached by the fiber optic cable.

The cable is one component of the network owned by electric utilities. Besides cable, small stations, transformers, electricity generator, and the other devices of connective to carry the electricity from electricity generation to the some homes or office.

When the electrical left the generation, he move to the substation, then its distributed to the wire that have high of voltage transmission. When it is used to transmit the broadband connection, a high voltage cable which is the first barrier. Electricity that flows on the transmission cable can be a high-voltage about 150 kV or even extra-high voltage above 500 kV. The magnitude of this voltage is not suitable for transmitting data.

As noted above, the electric current and RF use different frequencies. In order the data can be transmitted clearly from one point to another, then the required line, which supports the radio spectrum to vibrate without interferenced by other sources. Hundreds of thousands of volts of electricity does not vibrate at a fixed frequency. Electric current in the amount bulldoze all of the spectrum, and when moving in the RF spectrum used, it is certain signal transmission will drop or even fall apart.

BPL bypasses this problem by avoiding the use of high-voltage cable joint. This system lowers the voltage data to 7200 volts, or equal to the voltage supplied to the medium-voltage cables.