1. Definition is a Transformer?
A transformer is a static electromagnetic device that operates based on the principle of electromagnetic induction. It is used to change voltage levels in an electrical system without altering the frequency.
Electromagnetic induction is the phenomenon where a changing magnetic flux through a closed circuit induces an electric current in that circuit.
2. Working Principle
The transformer operates based on electromagnetic induction. When an alternating voltage is applied across the primary winding, it generates a varying magnetic flux. This flux passes through both the primary and secondary windings. As a result, an induced electromotive force (EMF) is generated in the secondary winding, thereby transforming the initial voltage.
3. Key components
Consists of three main components: the core, windings (coils), and the enclosure.
a. Iron core:
The iron core uses cold-rolled oriented silicon steel plates of good quality and uses a step-lap method to conserve the characteristics of silicon steel plates to function in no-load loss and exciting current characteristics.
The surface of the iron core is protected by antirusting paint.
b. Windings (Coils):
- High voltage coil: This is vacuum-cast with epoxy resin with excellent mechanical and electrical performances using conductors with high conductivity to be outstanding in short circuit strength and insulation performance.
- Low voltage coil: Using conductor and Prepreg insulating paper and it’s casted in epoxy resin to work well in short circuit strength and humidity resistance.
c. Enclosure:
The enclosure is usually made of cold-rolled steel plates with high mechanical strength, protecting internal components from environmental impacts. The enclosure is typically rectangular or cylindrical, depending on capacity and application. Its surface is coated with insulating and anti-rust paint to ensure operational safety.
4. Classification
Transformers can be classified into various types based on different criteria:
By Structure
- Includes two main types: Single-phase and Three-phase
By Functionality
- Includes Step-up transformers (increasing voltage) and Step-down transformers (decreasing voltage).
By Application
- Examples include Testing transformers, Measuring transformers, Autotransformers, etc.
By Technical Specifications
- Classification based on characteristics such as power capacity, voltage rating, frequency, and other electrical parameters.
By Insulation Method
- Two common types: Dry-type transformers (without insulating oil) and Oil-immersed transformers (using insulating oil).
5. Advantages of the solution of LS ELECTRIC
LS ELECTRIC’s cast resin transformer is a type of transformer that does not use insulating oil. Instead, it utilizes epoxy resin to insulate and cool the windings.
This LS product offers the following advantages:
Short circuit strength
The coils are vacuum cast with epoxy resin with excellent electrical and mechanical strength to be strong against short circuit accidents.
Suitable for supplying power to equipment with rapidly changing loads
Suitable for equipment such as electric-train power supply equipment and rolling equipment.
Impulse voltage strength
This has excellent impulse voltage strength owing to the outstanding insulation performance of epoxy resin and the design of split winding type.
Easy to maintain
This doesn’t need insulation oil exchange or separate fire-fighting equipment. Transformer
Humidity resistance
The high voltage coils are vacuum-molded to prevent moisture ingress during long-term storage so that it is possible to input power without drying.
Reduction of environmental impact
We obtain the certification F1, E2, C1 from CESI (Italia) and E3, C3 from FILK (Korea), according to IEC 60076-11.
Overload tolerance
LS Cast Resin Transformer has an excellent overload tolerance compared to the oil immersed type transformer to be used normally even at a temporary overload state.
Non-combustibility
LS Cast Resin Transformer uses non-combustible epoxy resin to prevent fires due to electric arcs and has self-extinguishable.
Overload capability
LS Cast Resin Transformer has an excellent overload capability compared to the oil immersed type transformer to be used normally even at a temporary overload site.
6. Technical Consultation and Product Quotation
LS ELECTRIC Vietnam hopes this article provides useful information for our valued customers. For further product consultation and quotations, please contact us
Hotline: 18006870
Email: hamh@ls-electric.com.vn
