electric substations

More Knowledge About Distribution Substations


A substation is a high-voltage electric system office. It is utilized to switch generators, hardware, and circuits or lines all through a system. It likewise is utilized to change AC voltages starting with one level then onto the next, and/or change alternating current to direct present or direct current to alternating current. A few substations are small with minimal more than a transformer and related switches. Others are expansive with a few transformers and many switches and other hardware. There are three aspects to substations:

Substation Types: Although, there are for the most part four sorts of substations are a combination of two or more sorts.

  • Step up Transmission Substation
  • Step down Transmission Substation
  • Distribution Substation
  • Underground Distribution Substation
  • Substation Functions
  • Substation Equipment

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

34,500Y/19,920 volts are interpreted as a three-stage circuit with a grounded neutral source. This would have three high-voltage conductors or wires and one grounded neutral conductor, a sum of four wires. The voltage between the three stage conductors or wires would be 34,500 volts and the voltage between one phase conductor and the neutral ground would be 19,920 volts.

From here the power is distributed to modern, business, and private clients.

Substations are intended to achieve the accompanying functions, although not all substations have every one of these functions:

  • Change voltage starting with one level then onto the next
  • Direct voltage to make up for system voltage changes
  • Switch transmission and distribution circuits into and out of the grid system
  • Measure electric power qualities flowing in the circuits
  • Connect communication signals to the circuits
  • Eliminate lightning and other electrical surges from the system
  • Connect electric generation plants to the system

Make interconnections between the electric systems of more than one utility

Significance Of Switchboards


An electric switchboard is a gadget that directs power from one or more sources of supply to a few smaller areas of utilization. It is a get together of one or more boards, each of which contains switches that permit power to be redirected.

The U.S. National Electrical Code (NEC) characterizes a switchboards as “a large single board, edge, or assemblies of boards on which are mounted, on the face, back, or both, switches, over-present and other defensive gadgets, buses, and generally instruments”. The part of a switchboard is to permit the division of the current supplied to the switchboard into littler currents for further distribution and to give switching, current security and metering for those currents. Switchboards may circulate energy to transformers, panelboards, control equipment, and, at last, to individual system loads.


Inside a switchboard there will be one or more busbars. These are flat pieces of copper or aluminum, to which the switchgear is associated. Busbars bring large currents through the switchboard, and are supported by insulators. Bare busbars are general, yet numerous sorts are manufactured with an insulating covers on the bars, leaving just connection points uncovered.

The operator is shielded from electric shock by safety switches and fuses. There may likewise be controls for the supply of power to the switchboard, originating from a generator or bank of electrical generators, particularly recurrence control of AC power and load sharing controls, in addition to gauges demonstrating frequency and maybe a synchroscope. The power going into a switchboard should constantly equivalent to the power going out to the loads.


Present day modern switchboards are metal encased and of “dead front” construction; no empowered parts are available when the covers and panels are shut. A switchboard may have incoming bus bars or bus conduit for the source connection, furthermore for large circuits fed from the board. A switchboard may incorporate a metering or control compartment separated from the power distribution conductors.

Present day modern switchboards are metal encased and of “dead front” construction; no empowered parts are available when the covers and panels are shut. A switchboard may have incoming bus bars or bus conduit for the source connection, furthermore for large circuits fed from the board. A switchboard may incorporate a metering or control compartment separated from the power distribution conductors.

Electrical Substations: How Engineers Layout Its Design?

Electrical Substation, a part of an electrical transmission, distribution and generation system’s main concern is encountering is its cost and reliability. An apt design attempts to strike a balance between the two sub stations, to attain reliability without a high cost. The design must also allow growth of the station, whenever obligatory.

Selection of the location of Electrical Substations must consider a lot of factors. Adequate land area is obligatory for installation of equipment with obligatory clearances for electrical protection, and for access to preserve large electrical machines like transformers. Where the land is expensive, like in urban areas; gas insulated switchgear may perhaps save money. The location or the spot must have room for expansion because of the load growth or premeditated transmission additions. Ecological effects of the substation should be considered, like, road traffic, noise and drainage effects. Earthing or grounding system ought to be designed. The total ground probable rise, and the gradients in probable throughout the fault (known as “touch” and “step” potentials), have got to be calculated to defend passers-by throughout the short-circuit in the transmission system. The substation locations have got to be rationally central to the distribution area to be provided. The location should be secure from intrusion by passers-by, together with protecting people from harm by arcs or electric shock, and to defend the electrical system from disoperation because of vandalism.

The primary step in planning a substation layout is the planning out of one line diagram that shows in simplified form the switching and protection requisite display and the incoming supply lines and transmission lines or outgoing feeders. It is a general practice by several electrical utilities to chart out one-line diagrams with principal elements, such as, switches, lines, transformers, circuit breakers set on the page similarly to the way the apparatus would be laid in the definite station.

Distribution Substation: Transmitting Power


All the electrical proceedings, electrical wires tend to pass through a component or unit which makes it feasible and practical to go to other units, easily. It is these electrical components that make work easy for the electricity house to easily distribute electricity to every house or single unit. It is the job and task of the electrical components that they effectively make use of the distribution station. The function of these distribution substations is major. The actual and prime usage of these units is to transfer power from the transmission system to the specific area’s distribution system. Hence, the task of Distribution substation could not be easily neglected.

They being the major and important units of the electrical system, they are given the highest authority to perform every single task, efficiently. It is quite extravagant or waste to straight away connect electricity users to the main transmission network, until and unless they make use of large amounts of power. It is because of this reason; the distribution station lessens the voltage to the most appropriate level for the local distribution.

The key functionality behind the use of these substations is not clearly understood. Hence, the function and service rendered by these units should be verified and tested by the electrical houses. The more intricate the functionality, the more complex would be the electrical wire mess. The function being obscure and complex, it is necessary that the personnel engaged in handling these substation is a proficient and competent one. Experts and only skilled professionals should be surcharged of handling the substations. If they are not that experienced, the service rendered by them would not be of that standard and competence. So, if you are factory owner going through this post, ensure that only experienced and skilled personnel are being employed in your unit.

Learning The Basics Of Electric Substations

electric substations

A substation possesses high voltage electric system facility. It is used for switching equipment, generators, and lines in and out of a system or circuits. It is also used for changing AC voltages from one level to other, changing direct current to alternating current or alternating current to direct current. Some substations are not that larger, it just possesses associated switches and a transformer. Others are very large with huge number of switches and other equipment and several other transformers.

A substation which is equipped with a step up transformer enhances the voltage through lessening the current, whilst the step down transformer reduces the voltage while enhancing the current for commercial and domestic distribution. The term ‘substation’ has been into existence days before the distribution system develops into a grid.

The first substations were linked to only one power station where the generator was located, and were supplementary of that power station.

Electric Substations usually have control equipment, protection and switching, and one or more transformers. In the large substation, circuit breakers are used for interrupting any overload currents or short circuits that may perhaps happen on the network. Smaller distribution stations might use fuses or recloser circuit breakers for safety or defense of distribution circuits. Substations do not generally have generators, though a power plant may possibly have a substation close by. Other equipment, like voltage regulators and power factor correction capacitors might also be situated at a substation.

High rise buildings might have several indoor substations. Indoor substations are generally found in urban areas for lessening the sound from the transformers, because of the appearance, or for protecting switchgear from extreme pollution or climate conditions. Where a substation possesses a metallic fence, it should be properly grounded for protecting people from high voltages that might occur in a fault in the network.

Electric Substations : The Specifications

An electrical substation is a supplementary station of an electricity generation, transmission and distribution system where voltage is transformed from the high to low or the overturn utilizing transformers. Electric power might flow through several substations between generating plant and customer, and may be changed in voltage in several steps.

Electric Substations

A substation which has a step-up transformer enhances the voltage whilst decreasing the current, as a step-down transformer decreases the voltage whilst increasing the current for commercial and domestic distribution. The term, substation comes from the days prior the distribution system became a grid.

The first substations were linked to only one power station where the generator was placed, and were subsidiaries of that power station.

Machinery in substation

Substations usually have switching, control and protection equipment and one or more transformers. In a huge substation, circuit breakers are used for interrupting any overload currents or short-circuit which might occur on the network. Smaller distribution stations might use fuses or re-closer circuit breakers for protecting distribution circuits. Electric Substations do not, by and large, have generators, though a power plant might have a substation close at hand.

Other equipment, like; voltage regulators and power factor correction capacitors might also be situated at a substation

High-rise buildings might have quite a lot of indoor substations. Indoor substations are generally found in urban areas for reducing the noise from the transformers, for reasons of manifestation, or for protecting switchgear from the extreme climate or pollution situations.

Where a substation has a metallic barrier, it must be suitably grounded or earthed for protecting the people from high voltages which might occur throughout a fault in the network. Earth faults at a substation could cause a ground probable rise. Currents flowing in the Earth’s surface all through a fault could cause metal objects for having a considerably different voltage than the ground under the person’s feet; this touch probability presents a danger of electrocution.


Distribution Substation: Specifications And Technicalities

Distribution Substation

The Distribution substation guidebook comprises of the approved standard arrangements for the installation, design and construction of distribution substations, connection of clients to these substations and interconnection of the substations to the surrounding LV and HV networks.  The distribution substation converts the voltage closer to the needed and required usable levels.

The distribution substation obtains power from one or more transmission or sub transmission lines at the resultant transmission or sub transmission voltage level and offers that power to one or more distribution feeders which invent in the substation and encompass the primary network. Most feeders originate radically from the substation for supplying the load.

There are five major functions of the Distribution Substation:

1.   Voltage transformation: One or more transformers would always be situated within the substation to step down the voltage to the prime distribution voltage level. These transformers would always be three phase banks, or they would be three single phase banks associated in a three phase configuration. The standard primary distribution voltage levels take account of 7.2kV, 4.16kV, 13.2kV, 12.47kV, 14.4kV, 34.5kV and 23.9kV.

2.   Switching and protection: Varied types of switchgear will be situated at the substation, comprising the following:

a. Switches

b. Circuit breakers

c. Reclosers

d. Fuses

3.   Voltage regulation: For the reason that current flows from source to load alongside the length of the feeder, and since the feeder has some quantity of impedance per unit length Z, the feeder would generate a voltage drop IZ volts per unit length.

4.   Metering: Most substations do have some kind of metering device which records, at a smallest amount, existing current and current maximum and minimum which have occurred in the last time period, for example 1 hour. Digital recording is also extensively used and competent of recording a large quantity of substation operational information.




What Is Known As Electric Substations?

Substations are a familiar sight at the side of cities and highways. Substations take the electrical energy from the transmission lines and from power plants and transform it from high to a lower voltage. They distribute electricity to customers and supervise and defend the distribution network to keep it working efficiently and safely, for instance by using circuit breakers, that is, the industrial strength equivalent of the humble fuse for cutting power in case of a problem.

electric substations

Substations are often classed as per the switchgear made use for protecting their circuits.

  • Air-insulated switchgear or also known as by the abbreviation AIS, is used to be the most ordinary design, although this needs a lot of space and for higher voltages is only reasonable outdoors. Even then, AIS or Air insulated switchgear might be unsuitable or undesirable in certain locations, such as residential areas.
  • Gas-insulated switchgear or also called as by the abbreviation as GIS might be more expensive if only the unit cost is measured up to, but is safer and requires less maintenance. The information that GIS units are five times smaller than AIS means cost savings and less or smaller intrusive buildings.

Electrical lines could be underground or overhead. The construction of overhead lines charges less, but outages are more common than on the underground lines, that is owing to the accidents, lightning strikes or bad weather.

What is found in an Electric Substations ? The equipment or tools found in switching devices and power transformers. Switching devices which are found in a substation are circuit breakers and dis connectors. Both these are used for cutting power in case of a problem, and measurement, defense and control equipment required for ensuring its safe and well organized operation. Since they are highly useful both commercially and residentially, therefore, they must be manufactured properly.


Electrical Substations: The Basics

electric substations

A substation is a division of an electrical generation, distribution and transmission system. Substations convert voltage from high to low, or the overturn, or execute any of numerous other vital functions. Between the generating station and customer, electric power might flow through several substations at varied voltage levels.

Substations might be owned and operated by an electrical efficacy, or might be owned by a large commercial or industrial client. Usually substations are unattended, relying on SCADA for remote control and supervision.

A substation might include transformers for changing voltage levels between the lower distribution voltages and high transmission voltages, or at the interconnection of two varied transmission voltages. The word substation comes from the being prior the distribution system became a grid. Since central generation stations became larger, smaller generating plants were transformed to Electrical Substations, receiving their energy supply from a larger plant despite of utilizing their own generators.


Electricity Distribution Using Substation Automation

distribution substation

One of the key features of the automated system which the entire procedure of electricity flowing is continually monitored and data is eventually gathered. In this regard and manner, it could be made certain that electricity is not worn out, which eventually results in a cleaner surroundings and helps in saving valuable natural resources, beside money. The notion of an automated system which distributes power is more or less alike to that of distribution substation that transmits television programs or radio. Like, in the case of these studios transmitting precise programs to a wide number of users, the automated systems are also competent of steering power to a wide number of residences in the most favorable manner. With several technical breakthroughs occurring, approximately every passing day, there are several other advantages which are expected to come for the end users in the days to come with automatic systems of electricity distribution.