Distribution transformers are used to reduce high primary voltages to lower utilization voltages for consumers. They come in various types including pole mounted, pad mounted, and underground transformers. Losses in distribution transformers include core losses from hysteresis and eddy currents, as well as copper losses from winding resistance. Efficiency is calculated based on total energy delivered over 24 hours rather than power ratio at full load, since distribution transformers rarely operate at full load. A breather uses silica gel to absorb moisture from transformer air and maintain a low dew point.
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
This ppt describes the function of Power Transformer in a Power Generation plant. Here DPL(Durgapur Projects Limited) was our VT venue, so chose it as the Base.
How is power transformer protected??? This provides a basic understanding of power transformer. Furthermore, the protective relay application on power transformer is included.
This ppt describes the function of Power Transformer in a Power Generation plant. Here DPL(Durgapur Projects Limited) was our VT venue, so chose it as the Base.
Distribution Transformer Manufacturing at Navana Electronics ltd (Aliv)Md Abu Jauad Khan Aliv
This Presentation I covered at my final year (Aug, 2014) of my BSc in EEE at IUBAT. Worked as an Intern at Navana Electronics Limited for 3 months at manufacturing division and I came up with this idea.
Transformer Design | Full Design | EE 3220 Electrical Machine Design
Design Approaches:-
At first, Core Design
then, Window Dimensions
then, Yoke Design
then, the Overall Dimensions of the Frame
then, Low Voltage Winding
then, High Voltage Winding
then, Resistance
then, Leakage Reactance
then, Regulation
then, Losses
then, Core Loss
then, Efficiency
then, No Load Current
then, Tank Design.
After following these design approaches, the parameters and regulations can be found for this design. If there needs some modification(like the regulation or loss is above the expectation limit), then by fixing one parameter the others can be changed and can be performed back-calculation.
WHAT IS TRANSFORMER, DEFINE TRANSFORMER, TYPES OF TRANSFORMER, RATINGS OF TRANSFORMERS, MANUFACTURING PROCESS OF TRANSFORMER, PARTS OF TRANSFORMER, TESTS OF TRANSFORMER, COSTING OF COPPER.
Distribution Transformer Manufacturing at Navana Electronics ltd (Aliv)Md Abu Jauad Khan Aliv
This Presentation I covered at my final year (Aug, 2014) of my BSc in EEE at IUBAT. Worked as an Intern at Navana Electronics Limited for 3 months at manufacturing division and I came up with this idea.
Transformer Design | Full Design | EE 3220 Electrical Machine Design
Design Approaches:-
At first, Core Design
then, Window Dimensions
then, Yoke Design
then, the Overall Dimensions of the Frame
then, Low Voltage Winding
then, High Voltage Winding
then, Resistance
then, Leakage Reactance
then, Regulation
then, Losses
then, Core Loss
then, Efficiency
then, No Load Current
then, Tank Design.
After following these design approaches, the parameters and regulations can be found for this design. If there needs some modification(like the regulation or loss is above the expectation limit), then by fixing one parameter the others can be changed and can be performed back-calculation.
WHAT IS TRANSFORMER, DEFINE TRANSFORMER, TYPES OF TRANSFORMER, RATINGS OF TRANSFORMERS, MANUFACTURING PROCESS OF TRANSFORMER, PARTS OF TRANSFORMER, TESTS OF TRANSFORMER, COSTING OF COPPER.
Circuit Breaker, Recloser and Tap-Changer Instrument Testinginfoweb12
Cutting-edge products for testing and analysing circuit breakers, on-load tap changers and reclosers, designed to ensure top performances in harsh environments.
Kenya’s main electricity producer walks us through their efforts in energy efficiency including their 2010 CFL program and other energy management projects.
Transformers are static devices, totally enclosed and generally oil immersed. Therefore, chances of faults occurring on them are very rare. But when fault occurring , It is very harmful for power system and our environment. So there are many protection system keep in back-up protection of power system safety.
Autorecloser relays are widely implemented in the electric utilities Over Head Lines networks to improve power availability and to maintain system stability.
Site testing need to be performed before operation to ensure proper function of Autoreclosers.
Transformer types core, shell, toroidal. steps to design a EI core type transformer by calculating tongue width, stack height etc and two examples are given
module 3 basic electrical notesIntroduction: This chapter deals the principle of operation & construction of single phase
transformer, types of the device, function of the different types of transformer and power
losses & efficiency of the device.
Definition: Transformer is a static (means there is no rotating part in it) electro magnetic
machine, which transfers electrical energy from one electrical circuit to another circuit
without changing frequency.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Hierarchical Digital Twin of a Naval Power SystemKerry Sado
A hierarchical digital twin of a Naval DC power system has been developed and experimentally verified. Similar to other state-of-the-art digital twins, this technology creates a digital replica of the physical system executed in real-time or faster, which can modify hardware controls. However, its advantage stems from distributing computational efforts by utilizing a hierarchical structure composed of lower-level digital twin blocks and a higher-level system digital twin. Each digital twin block is associated with a physical subsystem of the hardware and communicates with a singular system digital twin, which creates a system-level response. By extracting information from each level of the hierarchy, power system controls of the hardware were reconfigured autonomously. This hierarchical digital twin development offers several advantages over other digital twins, particularly in the field of naval power systems. The hierarchical structure allows for greater computational efficiency and scalability while the ability to autonomously reconfigure hardware controls offers increased flexibility and responsiveness. The hierarchical decomposition and models utilized were well aligned with the physical twin, as indicated by the maximum deviations between the developed digital twin hierarchy and the hardware.
2. Introduction of Distribution Transformer
In general distribution transformers are used to reduce primary
system voltages (2.4-34.5kV) to utilization voltages (120-
600V).
IEC (International electrotechnical comission) standards do
not distinguish between distribution transformers and power
transformer. They are all power transformers in the sense that
their purpose is to transmit power from one voltage level to
another.
Traditionally, transformers that transform the voltage down to
the domestic consumer voltage (usually 400V or less) are
called distribution transformers.
3. Common for most transformers regardless of size and
application is the basic physics and the dominant materials, like:
Special types of thin magnetic steel plates in the core, which provides the necessary
strong magnetic field because of the unique magnetic properties of iron;
Copper or aluminum as conductor materials in the windings;
Cellulose products like high density paper and pressboard as solid insulation materials
has been and with few exceptions still is dominant;
Mineral oil is the dominant insulating fluid, which also has cooling function.
In practical transformer design the manufacturer has the choice
between two different basic concepts:
Core type transformer
Shell type transformer
In a nutshell we can say that while the winding of core –type
enclose the core, the core of shell-type encloses the windings.
Looking at the active part (i-e the core with the windings) of a
core type, the windings are well visible, but they hide the core
limbs. Only the upper and lower yoke of the core are visible.
4. Looking at the active part (i-e the core with the windings) of a
core type, the windings are well visible, but they hide the core
limbs. Only the upper and lower yoke of the core are visible.
In shell-type the core hides the major part of the windings.
Another difference is that the axis of the core-type windings is
normally vertical while it can be horizontal or vertical in shell-
type.
Today much more core-type transformers than shell-type
transformers are manufactured in the world.
5.
6. A wound type of core used in single-phase distribution transformers is shown in
below
7. Distribution Transformers
Large Distribution Transformers, LDT
Transformers of this type are used for receiving the energy from higher
voltage levels and to transform and distribute the energy to lower voltage level
substation or directly to large industrial consumers.
The core is constructed of grain oriented steel laminations . The windings are
made of paper insulated rectangular wire in the form of multi-layer disc or
helical windings . And the conductor material are either copper or aluminum.
The tanks typically have radiators.
8. Distribution Transformers
Small Distribution Transformers, SDT
Transformers of this type are used to step down three-phase high voltage to
low voltage for energy distribution , mainly in the countryside or low-density
populated areas.
The transformers are three phase oil immersed hermetically(air tight) sealed,
adaptable for pole mounting or assembly in substations.
On customer request, the transformer can be equipped with an oil conservator.
Hot dip zinc coating is often the preferred surface treatment for outdoor
applications.
9. Distribution Transformers
Single phase pole mounted
Transformers of this type are generally oil immersed and suitable for pole
mounting. They represent an economical option for certain networks,
particularly those with low population densities.
Depending on customer requirements, transformers may be connected
between two phases of three phase system (two HV bushings) or from one phase
to ground (single HV bushing).
They are suitable for residential overhead distribution loads, as well as light
commercial or industrial loads.
10. Distribution Transformer
Types of Distribution Transformer
There are several types of transformer used in the distribution
system. Such as single phase transformer, three phase
transformer, pole mounted transformer, pad mounted
transformer, and underground transformer.
What is Voltage Regulation?
The voltage regulation is the percentage of voltage difference
between no load and full load voltages of a transformer with
respect to its full load voltage.
11. Distribution Transformer
Explanation of voltage regulation of transformer
If an Electrical power transformer is an open circuited, means load
is not connected with secondary terminals. In this situation, the
secondary terminal voltage of the transformer will be its
secondary induced emf E2.
Whenever full load is connected to the secondary terminals of the
transformer, rated current I2 flows through the secondary circuit
and voltage drop comes into picture. At this situation, primary
winding will also draw equivalent full load current from source.
The voltage drop in the secondary is I2Z2 where Z2 is the
secondary impedance of transformer.
12. Distribution Transformer
Now if at this loading condition, any one measures the voltage
between secondary terminals, he or she will get voltage V2 across
load terminals which is obviously less than no load secondary
voltage E2 and this is because of I2Z2 voltage drop in the
transformer.
Expression of voltage regulation of transformer
Expression of Voltage Regulation of Transformer, represented in
percentage, is
14. Distribution Transformer
Losses in distribution transformer
As the electrical transformer is a static device, mechanical loss in
transformer normally does not come into picture. We generally
consider only electrical losses in transformer. Loss in any
machine is broadly defined as difference between input power and
output power.
When input power is supplied to the primary of transformer, some
portion of that power is used to compensate core losses in
transformer i.e. Hysteresis loss in transformer and Eddy current
loss in transformer core and some portion of the input power is
lost as I2R loss and dissipated as heat in the primary and
secondary windings, because these windings have some internal
resistance in them.
15. Distribution Transformer
he first one is called core loss or iron loss in transformer and the later is
known as ohmic loss or copper loss in transformer.
Another loss occurs in transformer, known as Stray Loss, due to Stray
fluxes link with the mechanical structure and winding conductors.
Eddy currents are currents induced in conductors to oppose the
change in flux that generated them. It is caused when a conductor is
exposed to a changing magnetic field due to relative motion of the
field source and conductor; or due to variations of the field with
time
Copper Loss in Transformer
Copper loss is I2R loss, in primary side it is I1
2R1 and in secondary side
it is I2
2R2 loss, where I1 & I2 are primary & secondary current of
transformer and R1 & R2 are resistances of primary & secondary
winding. As the both primary & secondary currents depend upon load of
transformer, copper loss in transformer vary with load.
16. Distribution Transformer
Core Losses in Transformer
Hysteresis loss and eddy current loss, both depend upon magnetic
properties of the materials used to construct the core of
transformer and its design. So these losses in transformer are
fixed and do not depend upon the load current. So core losses in
transformer which is alternatively known as iron loss in
transformer can be considered as constant for all range of load.
Hysteresis loss in transformer is denoted as,
18. Distribution Transformer
Efficiency of Distribution Transformer
The efficiency of transformer is defined as the ratio between
output power to input power of the transformer at full load
condition, but in case of a distribution transformer, the concept is a
little bit different as the possibility of running a distribution
transformer at its full load condition is nearly nil.
In this concept, we use the ratio of total energy delivered by the
transformer to the total energy fed to the transformer, during a 24
hrs span of time instead of ratio of power output and input of the
transformer. Hence, all day efficiency is determined as, total KWh
at the secondary of the total KWh at the primary of the
transformer for a long specific period preferably 24 hrs. i.e,
19. Distribution Transformer
This is very much use full to judge the performance of a
distribution transformer, whose primary is connected to the system
forever, but secondary load varies tremendously throughout the
day.
20. Distribution Transformer
Construction of Silica Gel Breather
The silica gel breather of transformer is very
simple in the aspect of design. It is nothing
but a pot of silica gel through which, air
passes during breathing of transformer. The
silica gel is a very good absorber of
moisture. Freshly regenerated gel is very
efficient, it may dry down air to a dew point
of below − 40°C. A well maintained silica
gel breather will generally operate with a
dew point of − 35°C as long as a large
enough quantity of gel has been used. The
picture shows a silica gel breather of
transformer.