Again, substation of rating 33/11kV means, the substation has been designed to receive 5 MVA of power at 33 kV and it will distribute the same on 11 kV.

What is a 33 kV substation?

33kV substation earthing is provided around the transformer bund and new building structure using copper earthing tapes, electrode rods and exothermic welding (CADWELDing) of the earth rods to tape – 50mm x 4mm earth tapes are installed as a ring and cross earthing design with 40mm x 4mm copper tape braised for ...

Which transformer is in 33 11kV substation?

Transformers: To step down the 33kV primary voltage to 11kV suitable for distribution purpose. One 33kV/0.415 auxiliary transformer was also needed to supply the substation with reliable AC power.

What is a 132/33kV substation?

132/33 KV EHV substation

The power from main bus was fed into a 20MVA transformer which stepped the voltage down to 33KV. The power is then fed into a 33KV bus from which different loads were tapped.

What is kV in substation?

of electric supply. This is accomplished by suitable apparatus called Substation. For example, generation voltage (11KV or 6.6KV) at the power station is stepped up to high voltage (say 220KV or 132KV) for transmission of electric power. The assembly of apparatus (e.g. transformer etc.)

33/11 KV substation in hindi

Why is DC supply used in substations?

The main reason for using DC supply in substation or power stations is to provide a continuous power supply to the control circuit. DC is a reliable source of power supply because it can obtain from batteries. Only a battery can give continuous power supply until it fully discharges.

How much voltage is in a substation?

Distribution substations are located near to the end-users. Distribution substation transformers change the transmission or subtransmission voltage to lower levels for use by end-users. Typical distribution voltages vary from 34,500Y/19,920 volts to 4,160Y/2400 volts.

How are substations classified?

Classification of Substations by Operating Voltage

High Voltage Substations (HV Substations) – Involving voltages between 11 KV and 66 KV. Extra High Voltage Substations – Involving voltages between 132 kV and 400 KV. Ultra High Voltage – Operating voltage above 400 KV.

What does KV mean in electricity?

Definition of kilovolt

: a unit of potential difference equal to 1000 volts.

How do you identify 33 11kV overhead lines?

For the 11KV transmission line, generally Double Pole(DP) structure is used. In a transmission line, if three pieces of disc insulators per phase are connected, then the KV of the transmission line is 33KV.

What is the meaning of 11kV?

An 11kV line is an electric power transmission line that is designed to carry electric power at 11 kilovolts.

What is 11kV voltage?

For instance, in an 11kV three-phase system, the voltage between any two live conductors gives a line voltage of 11kV while the voltage between any live conductor and neutral (or earth) gives a phase voltage of 6.35kV.

What is the current in 11kV line?

An 11 kV distribution circuit may carry 150 A in each of its three phases, thus transmitting a power of 3 MW.

What type of earthing is found in 11 kV substation?

Pipe earthing is the most common type used for residential quarters and strip earthing is used for 11 kV substation.

What is 11kV feeder?

A three- phase, three-wire distribution line operating at 11 kV, known as a feeder, begins at the primary substation, and traverses the rural areas through villages and agricultural areas, serving a mixed customer base of agriculture, households and small businesses.

What are the three types of substation?

Types of Sub Stations

  • Step-up Type Substation. This type of substation gets the power supply from a near producing facility. ...
  • Customer Substation. ...
  • System Stations. ...
  • Distribution Type Substation. ...
  • Step-down Type Substation. ...
  • Underground Distribution Substation. ...
  • Switchyard. ...
  • 11kv Substation.

How many transformers are in a substation?

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

What are the three main parts of a substation?

There are three main types of substation: transmission, distribution, and collector.

  • Transmission. A transmission substation connects transmission lines, generally when all the lines concerned have the same level of voltage. ...
  • Distribution. ...
  • Collector.

What is the meaning of 33 kV?

Basically 33 kV / 11 kV is used for distribution of power at the substation and 66 kV / 11 kV is also used for the distribution. But whether to use 66/11 kV or 33/11 kV depends on many factors. Following are some of the factors which are taken care for the selection of voltage of substation.

Why every 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 of voltage or current and for pure sine wave rms value of current is Imax/root '2' and avg.

Why all transmission voltage is multiple of 11?

It is because form factor (form factor depends on shape of wave form) for example for DC form factor is one. For example for Ac(sinusoidal waveform) form factor is 1.11. But for simplicity and to use less calculation and equipment we consider form factor 1.1. so transmission voltage is multiple of 1.1 or 11.

Why are there 3 power lines?

A three-wire three-phase circuit is usually more economical than an equivalent two-wire single-phase circuit at the same line to ground voltage because it uses less conductor material to transmit a given amount of electrical power.

How many kV is high voltage?

The voltage range between 36 kV and 150 kV is referred to as the high-voltage level. The voltage range between 1 kV and 36 kV is referred to as the medium-voltage level. Any voltage below 1 kV is referred to as the low-voltage level. This is the voltage at which the electricity reaches the power sockets of households.

Which earthing is used in substation?

The copper products are used typically to provide electricity substation earthing to medium/high voltage grids containing electrical infrastructure, cables, switchgear and transformers.