Why do we increase the voltage from 11kV to 132kv using step up transformer in grid sub station?

Why do we increase the voltage from 11kV to 132kv using step up transformer in grid sub station?

For electric power, the current becomes low at a high voltage. So, according to the relation I2RT, the loss of energy due to heating in the line wire becomes less. Thus, the alternating voltage generated is first stepped up from 11 kV to 132 kV at the generation station.

Why is voltage stepped up for transmission?

The primary reason that power is transmitted at high voltages is to increase efficiency. As electricity is transmitted over long distances, there are inherent energy losses along the way. The higher the voltage, the lower the current. The lower the current, the lower the resistance losses in the conductors.

Why do transformers step up the voltage for transmission in overhead cables?

High voltage power transmission This means that high currents waste more energy than low currents. To reduce energy transfers to the environment, the National Grid uses step-up transformers to increase the voltage from power stations to thousands of volts, which lowers the current in the transmission cables.

Why is it important to step-down or step up voltage?

A step-up transformer beside the power station to step-up the voltage and consequently step-down the current reducing electrical energy wasted as heat energy in the overhead cables. Electricity is sent through these at 400,000 V.

Why is high voltage used for long transmission lines?

High voltage transmission lines deliver electricity over long distances. The high voltage is required to reduce the amount of energy lost during the distance. Unlike other energy sources such as natural gas, electricity can’t be stored when it is not used. If demand exceeds supply, a blackout occurs.

What is generating voltage?

The cutting of the field lines generates a voltage in the conductors. The voltages generated in the two sides of the coil are added. The induced voltage is connected to the generator terminals through the commutator and brushes.

How is voltage stepped up?

A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. As a step-down unit, this transformer converts high-voltage, low-current power into low-voltage, high-current power.

Why transmission voltages are in multiple of 11kV?

But we already know that there are some voltage drop due to the resistance of the transmission lines. For this reason, they transmit 10% extra voltage. Sending Voltage = 10kV x 10% = 11kV. While the receiving end voltage are 10kV due to voltage drop.

What is the purpose of increasing the voltage of the power supply by step up transformer?

A step-up transformer increases voltage and decreases current, whereas a step-down transformer decreases voltage and increases current.

Why is a step up transformer used at a power station?

Step-up transformers are used at power stations to produce the very high voltages needed to transmit electricity through the National Grid power lines. These high voltages are too dangerous to use in the home, so step-down transformers are used locally to reduce the voltage to safe levels.

Why is having a step up and step-down transformers are important?

Practical Significance of Step-Up and Step-Down Transformers The fact that voltage and current get “stepped” in opposite directions (one up, the other down) makes perfect sense when you recall that power is equal to voltage times current, and realize that transformers cannot produce power, only convert it.

What is the purpose of step up and step-down transformer?

Step-up transformers increase the voltage of the incoming current, while step-down transformers decrease the incoming current’s voltage. The incoming voltage is referred to as the primary voltage, while the outgoing stream is referred to as secondary.