Step-Up Substation and Its Significance In Power Distribution

A power Step-Up substation is a facility where electricity converts from transmission to distribution.

This is a technology from Daelim that will change the way to use power.

Power from the transmission grid is stepped down to the distribution grid for use in homes and businesses.

The grid is a network of interconnected power systems that supply power to the population. 

In this article, the step-up substation from Daelim, one of the important parts of the power grid, will be discussed.

Daelim is a well-known Chinese electrical component and solution.

Check them out if you’re seeking high-quality, well-made items that can provide remarkable results.

Step-Up Substation: The Ultimate FAQ Guide

What is A Step-Up Substation, and How Does It Work?

A step-up substation is a type of substation that gets its power supply from a near-producing facility.

It uses a large power transformer to enhance the voltage level for transmitting to a remote location. 

In the step-up substation, power transmission can be done by using a transmission bus to transmission lines.


Step-Up Substation
Step-Up Substation

Moreover, it can also be a knock on the incoming power as received by generation plants.

This power plant is capable of supplying power to the operation of apparatus in the plant.

It also includes circuit breakers for switch generation and transmission circuits in and out of service as required.

What are the common transmission voltages?

11 kV Substation

  • Its main purpose is to gather the energy being transmitted at a high- voltage from the producing station to lessen the voltage to a suitable value for local distribution and provide amenities for switching.
  • This substation includes an isolator, lightning arrester, step-down transformer, CT metering, circuit breaker, and a capacitor bank.

Common Faults and Routine Maintenance of 220kv Transformer

11kv substation transformer
11kv substation transformer
220kv substation
220kv substation

220 kV Substation

  • This substation is the power-capability utilized by step-down transformers in the substation.
  • It illustrates the highest apparent power a step-down transformer can provide.

1 MVA Three phase Pad-Mounted transformer 250mva 220kv – Daelim

132 kV Substation

  • This is the rating of the step-down transformer, which has a 132kV primary voltage.
  • These transformers are generally employed in transmission-type substations where it must step down the voltage to additional distributions.


132kv substation
132kv substation

Where Are Step-Up Substations Used For?

Step-up substations are used in areas that have higher voltages than the power grid. They are used to convert high voltage electricity into lower voltage electricity. Here are two examples of two uses of it:

Generating Stations

In generating stations, a high voltage of between 11 and 66 kV is used.

This output is fed to the step-up transformer in the step-up substation.

It increases the high voltage to ultrahigh voltage levels above 132 kV.

This enables the electricity to be transmitted on the primary transmission lines for a very long distance. 

This substation is either closely located to the generating station or within the premises of the generating station itself.

The primary objective is to increase the voltage drop the current by at least a hundred times.

Thus, it can be transmitted for long distances without hearing loss.

This is made possible through thinner wires that not only increase transmission efficiency but also reduce heating losses.

Selection of 500kV Main Transformer in Hydropower Station

Railway Substations

Most railroads and some specific Metro Rails utilize a high voltage of 25 kV AC single phase.

This is to provide traction to the locomotives that use high power induction or BLDC motors.

Because the overhead railway traction power lines are long, a voltage drop over longer distances is possible.

Thus, it results in the locomotive not being able to get the entire 25 kV voltage supply. 

Railway Substations
Railway Substations

What Are the Other Types Of Substations?

Substations are used to improve power transmission efficiency and reliability.

The step-up transformer is a part of this category, which is designed to raise voltage levels.

There are many different types of substations.

Find out more about them here.

Selection Method of Distribution Power Transformer

Step-Down Substation

This type of substation is located at different points in an electrical network.

It supports the distribution and transmission of power.

Moreover, they can be connected to any part of the network and source sub-transmission or distribution lines. 

Customer Substations

This functions as the main source of electric power supply for a specific business customer.

The technical requirements and the business case for this facility greatly depend on the customer’s requirements.


Distribution Substation

This type of substation is where the main voltage distributions are stepped-down to supply voltages using a distribution network.

The voltage of any two phases will be 400 volts.

Meanwhile, the voltage between neutral and any phase will be 230 volts.

Selection of Power Distribution Main Transformer in 110kV Substation Design

Underground Distribution Substation

An underground distribution substation is the most widely used and common type of substation.

The primary purpose of this substation is to provide all the functionality of a conventional substation while minimizing the area occupied above the ground.

What Are The Substation Components?

Electrical substation components are essential for the installation of the substation. It is designed to prevent dangerous ground potential in areas where personnel operate switches or other apparatus.


Some of the important substation parts are powered by batteries. The size of the battery bank depends on the voltage required for operations of the DC circuit.

The two basic types are acid-alkaline batteries and lead-acid batteries.

The lead-acid batteries are of the most common type, providing high voltages at a cheaper cost.

substation components - Batteries
substation components - Batteries
substation components - Bus Bar
substation components - Bus Bar

Bus Bar

The busbar is one of the most important elements of a substation.

It is a conductor that carries current to have numerous connections with it.

In other words, it is a kind of electrical connection where the incoming current and outgoing current take place.

Capacitor Bank

It is defined as a set of multiple identical capacitors connected either in parallel or in an enclosure and utilized to correct power factors and protect circuitry, such as a transformer substation.

The main purpose is an economical technique for power factor maintenance and for correcting power lag problems. 

substation components - Capacitor Bank
substation components - Capacitor Bank
substation components - Circuit Breaker
substation components - Circuit Breaker

Circuit Breaker

This type of switch is used to close or open a circuit when a fault occurs within the system. Circuit breakers have 2 mobile contacts that are in “off” condition in normal situations.

It will send a tripped command to the circuit breaker that moves the contacts apart when a fault occurs.

Hence, avoiding possible circuitry damages.

Preventive measures for tripping of three-side switch of 110kV main transformer

Current Transformer

The current transformer is used for transforming higher value currents into lower values.

It is utilized analogously to that of AC instruments, control apparatus, and meters.

Also, it is used for maintenance and installation of current relays for protection purposes in substations.

substation components - Current Transformer
substation components - Current Transformer
substation components - Instrument Transformer
substation components - Instrument Transformer

Instrument Transformer

The instrument transformer is a device used for reducing higher currents and voltages.

For safe and practical usage, it is measurable with traditional instruments such as digital multimeters and more.

Analysis of Performance Data of High Voltage Distribution Transformer


The Insulators do not allow the flow of electrons through them. Examples of insulators are shackle, strain type, suspension type, and stray type.

They are used in substations for avoiding contact with humans or short circuits.

The main factors affecting the insulation performance of transformers

substation components - Insulator
substation components - Insulator
substation components - Isolator Transformer
substation components - Isolator Transformer

Isolator in Substation

The isolators in substations are mechanical switches deployed for isolating circuits when there is a current interruption.

These are mechanically operated switches.

Selection of 500kV Main Transformer in Hydropower Station

Lightning Arrester

Lightning arresters have the function of protecting substation equipment from high voltages and are also restricting the amplitude and duration of the current’s flow.

These are connected amid earth and the line.

How to ground the pad-mounted substation?

Lighting Impulse Equipment
Lighting Impulse Equipment

Power Transformer

The power transformer is used to transmit electrical energy in electronic or electrical circuits between distribution primary circuits and generators.

These transformers are used in distribution networks to interface step down and step up voltages.

Power Transformer: The Ultimate FAQ Guide


The relay is used when the transformer oil is heated due to fault currents and decomposed into gas bubbles.


Switchyards are used for the connection and disconnection of transformers and circuit breakers.

These also have lightning arrestors to protect the substation or power station from strokes of natural lighting.

Preventive measures for tripping of three-side switch of 110kV main transformer

Voltage Transformer

Voltage transformers are devices that convert the energy of one form to another.

It is designed to present negligible load to supplies being measured.

Selection of Voltage Regulation Mode of 1000kV Transformer and Operation and Maintenance


The wave trapper is placed on the incoming lines to trap high-frequency waves.

High-frequency waves coming from nearby substations or other localities are disturbing the currents and voltages.

Wave trappers are tripping high-frequency waves that divert the waves into the telecom panel.

Can You Build Next To A Substation?

If you are trying to build next to an overhead line, you must consider the voltage safety clearance distances for the finished development and construction.

If the developments are near a substation, you must be very wary about buried cables.

Contact the electricity company and talk to them.

Selection and Capacity Calculation of Transformers Used in Substations

Substation under construction
Substation under construction

What Is the Heart Of Substation?

The heart of the transformer is the substation.

The transformer changes the relationship between incoming voltages and currents.

Substation transformers are known for their primary and secondary voltage relationship and their power carrying capabilities.

What is The Use of Power Transformer?

Who Is Responsible For Electricity Substations?

The electricity distribution companies are responsible for the network of underground cables, power lines, and substations that gathers the electricity going to your home or business in areas where you live.

Daelim has been supplying power and liquid-filled transformers to clients for 15 years.

Daelim products meet international standards and are built with state-of-the-art technology so that you can rely on them to power your electronics. 

About Bin Dong

Hello, I am Bin, General manager of Daelim which is a leading transformer manufacturer. As a expert, I am glad to share my experience in transformer to you. I believe our professional team can always provide you with high quality service and we are ready to provide you with one stop solution. If you have problems when you are looking for the equipment, what you need to do is tell us.

Custom Step-Up Substation

When you need to find more than just existing transformers, Daelim’s Transformer Service Center can help you design and produce distribution transformers that meet your unique needs.

We have our own factory and a professional team of engineers, which can design and modify application requirements that meet all your conditions.

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