A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. It can be designed to “step up” or “step down” voltages and works on the magnetic induction principle.

alternating current

A transformer is a passive electrical device that transfers electrical energy from one electrical circuit to another, or multiple circuits.

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How close can I live or work near powerlines or other electrical sources? There is no established evidence that the exposure to magnetic fields from powerlines, substations, transformers or other electrical sources, regardless of the proximity, causes any health effects.

Q: What are the health risks of living near a substation? Scientific evidence does not support a cause-and-effect relationship between EMF exposure and health risks. People get most of their EMF exposure from electrical wires along the street and from wiring in their homes.

As per the Indian Electricity Act, buildings should maintain a horizontal distance of 1.2 metres from 11kV lines and 4 metres from 66kV lines.

In conclusion, there are no known health risks that have been conclusively demonstrated to be caused by living near high-voltage power lines. But science is unable to prove a negative, including whether low-level EMFs are completely risk free.

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Studies have examined associations of these cancers with living near power lines, with magnetic fields in the home, and with exposure of parents to high levels of magnetic fields in the workplace. No consistent evidence for an association between any source of non-ionizing EMF and cancer has been found.

High Tension wire is the wire used for transmission of electrical energy having high voltge over long distances. They require to have low resistance in order to minimise heat losses and should be able to withstand high voltages.

conclusive and convincing evidence that exposure to extremely low frequency EMF emanated from nearby high voltage Transmission lines is causally associated with an increased incidence of cancer or other detrimental health effects in humans.

Why High Voltage The primary reason that power is transmitted at high voltages is to increase efficiency. The higher the voltage, the lower the current. The lower the current, the lower the resistance losses in the conductors. And when resistance losses are low, energy losses are low also.

The bare wire conductors on the line are generally made of aluminum (either plain or reinforced with steel or composite materials such as carbon and glass fiber), though some copper wires are used in medium-voltage distribution and low-voltage connections to customer premises.

It isn’t practically viable. In case of Underground cables, insulation is required so that the live cables don’t touch earth and get shorted. In over head lines, the air naturally insulates the lines and hence there is no need for insulation.

Copper and aluminium are most frequently used as the electrical conductors in electrical cables due to their low resistance and excellent conductivity. For this reason aluminium finds favour in large size cables and cables for overhead power distribution.

Conductors consist of materials that conduct electric current, or the flow of electrons. Nonmagnetic metals are typically considered to be ideal conductors of electricity. The wire and cable industry uses a variety of metal conductors, but the two most common are copper and aluminum.

It’s not a big problem when copper wiring rusts, since the copper oxide that forms is electrically conductive. When aluminum wiring rusts, the white oxide is not a very good electrical conductor. It does interfere with the flow of electricity, and again, can cause overheating.

Aluminum is an excellent heat and electricity conductor and in relation to its weight is almost twice as good a conductor as copper. This has made aluminum the first choice for major power transmission lines.

Aluminum Properties – What are the Physical Properties of Aluminum?

• Color : Silvery-white with a bluish tint.
• Hardness : The pure metal is soft, but it becomes strong and hard when alloyed.
• Ductility : It can be beaten into extremely thin sheets.
• Malleability : Capable of being shaped or bent.