Why the voltage is multiple of 11?

Why the voltage is multiple of 11?

Answer: When an alternator generates voltage, we always use a multiple of 1.11 because for a pure sine wave the FORM FACTOR is the ratio of rms value of voltage or current with the avg. value is 2Imax/pie and which comes out to be 1.1; We can’t have a combination of other then a multiple of 1.11*.

How many transformers does a substation have?

A transformer substation usually has one or two power transformers, distribution equipment, control and protective devices, and auxiliary equipment.

Why do we use 11KV to 33KV?

It is cheaper to generate at a relative lower voltage and then step it up for transmission. Hence, most power generating plants are designed to operate at 11KV. To generate at 33KV, the size of the motor might be twice as large as the size of 11KV generator.

Why is there an extra wire in a typical power substation?

Many towers also have extra wires running along the tops of the towers. These are ground wires and are there primarily in an attempt to attract lightning.

Why substations are rated as 11kw and 22kw?

In case of no load, there may be negligible voltage drop and we may get 110% (i.e. Sending + 10% extra which is 11kV) voltage at the receiving point. For this reason, transformer and substation should be rated at full 110% which is 11kV, 22kV and so on.

Why transformer is used in substation?

The transformer is the heart of the substation. The transformer changes the relationship between the incoming voltage and current and the outgoing voltage and current. Some large transformers have fins for the oil to circulate through and thus dissipate heat. …

Do all substations have transformers?

The downtown areas of large cities feature complicated distribution substations, with high-voltage switching, and switching and backup systems on the low-voltage side. More typical distribution substations have a switch, one transformer, and minimal facilities on the low-voltage side.

Why is generating voltage low?

Ground fault in field winding is the most common causes of under voltage. Short circuit in field or stator winding is another reason. If brush contact surface is small and poor connection, then voltage drop will happen. Poor fuel circulation is an important reason of voltage drop.

What does single line diagram of 11kV substation mean?

The single line diagram of an 11 KV substation is shown in the figure below. The single line diagram makes the system easy and it provides the facilitates reading of the electrical supply and connection. The working of the electrical equipment used in the substation is explained below in details.

What is the voltage of a primary grid substation?

The primary grid substation is generally of outdoor type.4.1.1.1.3SECONDARY SUBSTATIONS At a secondary substation, the voltage is further steeped down to 11KV. The 11KV lines runs along the important road of the city.

What is the main function of a substation?

Substation provides the energy supply for the local area in which the line is located. The main function of the substation is to collect the energy transmitted at high voltage from the generating station and then reduce the voltage to an appropriate value for local distribution and gives facilities for switching.

What is the generation voltage of 11 kV?

For example; generation voltage (11 KV or33 KV) at the power station is set up to high voltage (say 220 KV or 132 KV) for transmission ofelectric power. The assembly of apparatus (e.g. transformer etc.) used for this purpose in thesubstation. Similarly near the consumer’s localities, the voltage may have to be step down toutilization level.