Dry Type Transformers

Cast resin transformers are distribution, industrial and power transformers with ratings up to 30 MVA. Medium voltage windings are vacuum casted with epoxy resin and they are suitable for indoor or outdoor applications.
Outdoor solutions can be realized with a wide range of boxes;  for lower ratings there is the new type IP00 (without enclosure), validated according to ENEL regulation.
TTR transformer can be used in substations for Data Centres, public buildings, hospitals, airports, and in places where usage of liquid immersed transformers is restricted for fire risk or environment protection, eg tunnels, marine, cranes, offshore platforms, wind turbines, groundwater catchment areas and food processing plants. 

Flexible corrugated tank walls are able to give sufficient cooling to the transformer, compensating the changes of oil volume caused by temperature variation during the operation; Having oil not in contact with external atmosphere, the absorption of moisture is avoided.
It can be considered as maintenance free transformer.

In case liquid volume inside the tank is critical, the conservator is used to compensate its expansion during operation in presence of high ambient temperatures.
These transformers are equipped with air breather or as option with rubber bag air / liquid separation to protect it against moisture and oxidation.

Power rating : up to 180 MVA

Insulating level : up to LI 1050 kV

Power transformer is common used in all those applications where it is necessary to connect AC networks working at different high voltages with the purposes of transmission or distribution of energy. 

SEA manufactures a wide range of medium and high voltage transformers suitable for electrical generation, transmission and distribution applications:

used to connect the generator voltage level up to the transmission one.

used to connect the transmission voltage level to the distribution one.

used for connecting systems of energy transmission with different voltages

 Power factor correction (PFC) is a technique used to improve the power factor of an electrical system. The power factor is the ratio of real power (used for productive work) to apparent power (the total power flowing in the circuit). A power factor of 1 (or 100%) is ideal, meaning all the power is being effectively converted into useful work. 

In many industrial and commercial systems, the power factor is less than 1, often due to inductive loads like motors and transformers. A low power factor can lead to increased energy costs, reduced system capacity, and potentially higher utility charges.

Power factor correction is typically achieved by adding capacitors or synchronous condensers to the electrical system. These components offset the inductive effects of the loads, helping to align the voltage and current waveforms. Benefits of power factor correction include:

1. Reduced Energy Costs: Utilities often charge penalties for low power factor, so correcting it can lower electricity bills.
2. Increased System Capacity: A better power factor can allow for more efficient use of the electrical infrastructure, leading to increased capacity.
3. Improved Voltage Stability: PFC can help improve voltage levels in the system, benefiting sensitive equipment.
4. Reduced Losses: Higher power factor can reduce losses in the electrical distribution system.

Overall, power factor correction is important for maintaining efficiency and reliability in electrical systems.

AXG collects the current trends in real time, sending them to an internal control circuit, via n. 3 CTs installed on the loading side.

Through integrated FPGA technology, the fundamental components of the currents, the harmonic components, the reactive currents and the components responsible for the imbalance are extracted; the needed currents for compensation and the compensation currents emitted by the AXG system are compared, and the difference is calculated.

In order to allow the IGTB inverter to be able to inject the necessary currents into the electrical network, input signals are emitted to the driving circuit, so as to achieve closed-loop control and complete the compensation function, both in terms of filtering and of power factor correction.

The operating modes operate according to the priority principle (selectable), to be chosen between Active Filter (AHF), Power Factor Correction (PFC) and Phase Balancing (UNBALANCE).

AHF, Active Harmonic Filter mode
AXG is able to filter harmonic currents (THDi) up to the 50th order and significantly reduce the THDv components. Applicable in any condition in both the industrial and civil sectors, they represent the ideal solution for the treatment of non-linear three-phase loads, with or without neutral.

PFC, Power Factor Correction mode
AXG, thanks to its electronic operation, is able to operate where a traditional power factor correction system could not do the same with the appropriate reliability over time.
For example, all applications - mainly in heavy industries - with prohibitive harmonic contents - both current and voltage - also for power factor correction systems with detuning inductors.

The primary function of these devices, albeit in different methodologies, it’s the same of an UPS, that is to guarantee the continuity of power supply. In fact, the only difference between an UPS and an AC / DC power supply unit is that the DC output voltage, instead of AC. Therefore, the use of these power systems is attributable to the same fields of application of the UPS, whose purpose is to ensure continuity of service, in order to avoid substantial damage at an electrical, economic and safety level.