Unsere Realisierungen

Client:
ONDE is one of the leading renewable energy (RES) companies in Poland, operating as a general contractor and developer of large-scale wind and solar farms. The company delivers projects comprehensively – from concept and construction to maintenance. ONDE has completed over 400 wind and photovoltaic farms with a total capacity of nearly 5 GW, actively supporting the country’s energy transition. Its portfolio of RES development projects exceeds 1.3 GW.

Challenge:
ONDE required a compensation reactor in an outdoor enclosure, designed for operation in field conditions on a photovoltaic farm. Due to the cyclic nature of PV system operation, compensation reactors are particularly exposed to harsh environmental conditions. They do not operate continuously – they are activated primarily during periods without sunlight, which increases the risk of water vapor condensation inside the enclosure.

The enclosure design had to ensure both effective heat dissipation and protection of the reactor windings against atmospheric factors such as rain and snow.

Solution:
For ONDE, we supplied two ED3K compensation reactors – 545 kVar and 345 kVar. To ensure failure-free operationin a demanding environment, we enclosed them in ELHAND IP34 durable enclosure, equipped with:

• Ventilation grilles with water protection – minimizing moisture and rain infiltration.
• Rodent protection mesh – preventing rodents from entering the interior.
• Anti-condensation heater – eliminating the risk of moisture buildup and corrosion.
• Transport handles – facilitating easy transport and installation.

Results:
The compensation reactors in the Elhand IP34 outdoor enclosure have significantly improved the efficiency of ONDE's photovoltaic farm.

• Reactive power balancing – the supplied inductive reactive power compensates for excess capacitive reactive power, stabilizing voltage.
• Stable voltage – improved energy quality ensures safer and more efficient system operation.
• Lower energy losses – better reactive power compensation increases the efficiency of the PV system.
• Failure-free operation in harsh conditions – thanks to the weatherresistant IP34 enclosure.
• Quick installation – no civil works required.

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Client:
The Institute of Power Engineering - National Research Institute, Gdańsk Division is a leading research organization specializing in analyzing and implementing innovative solutions in automation for the power sector. It actively operates in the fields of power generation from both conventional and renewable energy sources (RES), as well as in energy storage, transmission, distribution, and efficient utilization. Among its five divisions, the Gdańsk branch stands out as the largest and most prominent field office, playing a key role in executing strategic projects.

Challenge:
A sugar refinery, acting as the end investor, required a reliable and modern excitation system for its synchronous generator. The turbine-generator set was to play an important role in reactive power compensation and ensuring emergency power supply in the event of a loss of access to the mediumvoltage network.

The greatest challenge was meeting the tight deadline for transformer delivery before the start of the so-called sugar campaign, which runs from autumn to mid-winter. During this time, any failure could interrupt production processes. The excitation system needed to be overloadresistant and ensure stable operation of synchronous machines.

Solution:
Elhand provided two advanced transformers for the excitation circuit of the synchronous generator, as part of a modernization effort led by the Institute of Power Engineering, Gdańsk Division. Elhand's transformers were designed with a focus on:

• High reliability – critical for the plant's operation.
• Optimal operating parameters – ensuring stability in both static and dynamic states.
• Resistance to higher harmonics – present in the circuit, mitigating the risk of overvoltage, overheating, and system instability.

The voltage regulators used in the generators feature excellent regulation characteristics and precise voltage parameter adjustment, enhancing the efficiency and safety of the entire system.

Results:
The excitation transformers delivered by Elhand:

• Operate faultlessly within a system equipped with an automatic voltage regulator, adapting voltage to the requirements of power electronics.
• Have been optimized for resistance to current harmonics, preventing issues such as overvoltage and overheating.
• Ensure stability and reliability, which are crucial for maintaining continuous production processes during the sugar campaign.

The outcomes of this collaboration confirm the effectiveness of Elhand's technology in demanding industrial applications.

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Client:
ZPUE S.A. is a recognized leader in the power and industrial sectors, having specialized for 35 years in the creation of advanced solutions for the power industry, such as container transformer stations, pole-mounted transformer stations, MV and LV switchgears, energy storage, and fast charging stations for electric vehicles.

Challenge:
To maintain independence of power supply from the distribution grid and increase the efficiency of energy produced by the 1.3 MWp photovoltaic power plant, the Client decided to build a 1 MW energy storage facility with a capacity of 4.3 MWh.

The purpose of the energy storage facility is to store excess produced on sunny days and discharge it during times of increased demand by consumers and participate in electricity trading. Additionally, the energy storage will act as a power; in the event of a power failure on the distribution grid, it will form a micro-grid together with the PV system (off-grid operation of the storage).

The energy storage is built from an energy storage unit and a bidirectio-nal AC/DC converter withconnection to medium voltage grid. One of the key components of the converter is the 15.75/0.39 kV isolation transformer, which integrates the grid system and output voltage from the IGBT converter.

Solution:
The ET3H 1250KVA 15.75/0.39 kV isolation transformer produced by Elhand was selected due to its flexibility in design and customization by engineers to meet the requirements of building a bidirectional AC/DC converter with integration into the medium voltage network. Additionally, the transformer's technology enables energy transmission in both directions, maintaining high energy efficiency even with rapidly changing loads.

EEffects:
The use of the Elhand 125KVA transformer enabled the achievement of the following goals:

• Increase in the share of renewable energy sources (RES) – better utilization of energy from renewable sources to power the Client’s facilities.
• Energy independence – enhancement of the Client’s facility’s energy independence.
• Increased network stability – due to the ability to quickly respond to changes in energy demand and production.
• Reduction of energy losses – optimization of energy flow and utilization throughout the entire infrastructure.

„We have been collaborating with Elhand for almost 20 years. In this project, Elhand has once again proven to be a reliable supplier we can count on. In our mutual relationship, we value the speed of service, excellent technical support, and the ability to customize transformer designs to meet our needs. We are pleased to create pioneering solutions for the Polish power industry together, such as energy storage systems.” - Project Engineer | New Technologies Department | ZPUE

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Client:
JMS manufactures, sells and services industrial automation systems. The company is an authorized partner of Danfoss Drives Poland. JMS offers professional service of VLT and VACON drives.

The Challenge:
The RADPEC district heating plant in Radom required a fail-proof backup system for a critical 75kW water pump. Continuity of the pump's operation is essential for maintaining heating supply to the city, making it imperative that the system would withstand power outages without affecting performance.

The Solution:
Elhand supplied DC reactors for an intermediate circuit between a Danfoss DC-DC converter and a battery energy storage unit, executed by JMS. The DC backup system ensures continuous, uninterrupted operation, crucial for the plant's operation.

The Results:
JMS designed a 75kW pump control system using VACON (Danfoss Drives) frequency inverters and Elhand's DC reactors, offering seamless control of the PP1 pump with 400VAC supply and ensuring operation for at least 15 minutes during power outage. The system, featuring an uninterruptible switch from mains to a VRLA-type AGM battery supply, maintains pump performance and recharges batteries during normal operation. The AGM batteries have a lifespan of 10-12 years.

„The Elhand ED1X-1mH/92A 750V reactor is distinguished by its precision engineering, ensuring that the DC-DC conversion process operates within the desired parameters and significantly contributed to the success of our project. This experience with Elhand not only showcases their capability to provide solutions that meet unique demands of drive systems but also cements their reputation as a reliable and trustworthy partner." - Janusz Mamla | JMS Automation

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Client:
Geotermia Koło Geotermia Koło is a dynamically developing company that plays a crucial role in providing sustainable energy to the residents of Koło. The activities of Geotermia Koło focus on utilizing geothermal heat sources to provide a sustainable and ecological source of heat for the residents, offering a modern and environmentally friendly solution in the field of district heating.

The Challenge:
The challenge was to ensure efficient and reliable power supply for a deep well water pump, a key component of the geothermal system. The pump, with a power of 420kW and suspended at a depth of 350 meters below the ground level, required a stable and strong source of electricity for effective operation.

The Solution:
Specializing in electrical power solutions, we provided an ET3H-610 type transformer. This specialized transformer was designed to meet the high demands of the geothermal installation, providing reliable and efficient power supply for the deep well water pump.

The Results:
The application of the ET3H-610 transformer:

• Enabled heat extraction from a deep borehole with a diameter of 10 inches and a depth of 2980 meters.
• Contributed to achieving a power of approximately 11.5MW from the geothermal installation, covering about 80% of the annual heat demand for Geotermia in Koło.
• Reduced reliance on coal-fired boilers, cutting carbon dioxide emissions by about 75%.
• The high temperature of the geothermal reservoir (around 90°C) allows for heat to be obtained exclusively from geothermal energy for a significant part of the year.

„Through collaboration, one of the most ambitious geothermal projects in Poland was successfully realized, demonstrating the possibilities of using renewable energy sources in an effective and sustainable way. This project serves as a model for other cities and regions, showing how modern technologies can contribute to reducing the carbon footprint and improving the quality of life for residents." - Przemysław Stasiak | CEO of Geotermia Koło

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Client:
Telford Offshore is an international offshore service provider offering cost-effective construction and project management solutions to the Oil & Gas Industry. Trelford Offshore adapts to clients’ needs and operates in the most challenging environments, delivering safe access to and support of offshore worksites.

The Challenge:
We faced a significant challenge due to a short turnaround time of only 5 weeks, especially during the difficult summer season. Our task was to ensure the timely fabrication and delivery of a highquality, large marine transformer that would support the power conversion needs of the vessel, Telford 25. The transformer played a critical role in operating the motion-compensated Telescopic Gangway, facilitating safe passenger transfers from the vessel to offshore platforms.

The Solution:
Key solutions implemented included:

• Efficient Communication: We established effective communication channels to ensure a seamless flow of information, enabling real-time updates and adjustments as needed.
• Rigorous Quality Control: ELHAND experts, in collaboration with Client, maintained strict quality control measures at every stage of the transformer's fabrication. This helped us ensure that the final product met the highest industry standards.
• Accelerated Dispatch: Recognizing the critical role of the transformer, we worked diligently to expedite its dispatch, ahead of the estimated delivery date. This ensured that our client could adhere to the project schedule and mobilize the vessel as planned.

Results:
On-Schedule Mobilization: The transformer ET3SM-630 440//690 dD0 60Hz T45F AL IP23 was delivered and installed on the vessel, Telford 25, as planned. This on-time delivery allowed us to adhere to our project schedule and mobilize the vessel without delays.

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Kunde:
Taurus-Technic Sp. z o.o.
Nationaler Marktführer im Bereich der Blindleistungskompensation (NS und MS) und lizenzierter Partner von SIEMENS, dem führenden Unternehmen auf dem globalen Stromverteilungsmarkt. Seit 1991 bietet Taurus-Technic auf dem polnischen Markt auch die neuesten Lösungen für Niederspannungsschaltanlagen und eine ganze Reihe von Mittelspannungsschaltanlagen.

Herausforderung:
Erforderliche Kompensationsleistung von 900kVAr mit der Möglichkeit der Staffelung (2 x 450kVAr) und sehr geringer Bauraum im Vergleich zu Standardlösungen.

Lösung:
Eine einzigartige Lösung, die speziell für die Bedürfnisse des Partners entwickelt wurde, mit zwei unabhängigen, übereinander angeordneten Drosseln. Drosseln dieses Typs werden meistens in Windparks eingesetzt, um die aus der Kapazität der Versorgungsleitungen resultierende Blindleistung zu kompensieren.

Ergebnisse:
Die Kompensationsdrossel Typ ED3KH-2x450 ist eine von zwei Doppelkompensationsdrosseln mit einer Leistung von 900kVAr (2x450kVAr) und einer Nennspannung von 15,75kV. Die Drosseln der Serie ED3KH-2x haben ein gemeinsames Joch, wodurch der Materialeinsatz bei der Konstruktion reduziert wird (im Vergleich zu zwei separaten, unabhängigen Drosseln), was wirtschaftliche Vorteile mit sich bringt und den verfügbaren Raum optimal ausnutzt.

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Kunde:
Praxis Automation Technology B.V. entwickelt und fertigt Schiffsautomatisierung und elektrische Antriebssysteme für alle Arten von Schiffen. Zusammen mit allen angewandten Produkten für Automatisierung und elektrische Antriebssysteme, die im eigenen Haus entwickelt und hergestellt werden, bietet Praxis ein einzigartiges Paket, das nur wenig oder gar keine mit der Systemintegration verbundene Arbeit erfordert. Dieser Ansatz ist einzigartig auf dem Markt und bietet eine unvergleichliche Kosteneffizienz und Sicherheit.

Herausforderung:
Praxis ist ein führender Anbieter von elektrischen Systemen für Hochgeschwindigkeits-Motoryachten. Der Trend auf dem Markt geht dahin, das Gewicht und die Abmessungen der gesamten Schiffsausrüstung zu minimieren. Dies zwingt die Hersteller dazu, nach den optimiertesten Lösungen zu suchen. Die Produkte müssen klein und leicht sein und gleichzeitig eine hohe Leistung und Zuverlässigkeit aufweisen.

Lösung:
Elhand schlug eine individuelle, kompakte LC-Filter- und Transformator-Konstruktion in einem gemeinsamen Gehäuse vor. Um Gewicht zu reduzieren, wurden sowohl die Wicklungen als auch das Gehäuse aus Aluminium gefertigt. Das zweite Ziel war die Minimierung des Platzbedarfs, was durch den Einsatz des wassergekühlten Systems erreicht wurde. Der Kunde erhielt ein spezielles Produkt, das leicht in die Elektroinstallation der Yacht integriert werden konnte.

Ergebnisse:
Das NETZWANDLER-AUSGANGSSET ist eine fertige Lösung für den Anschluss eines Netzstromrichters an das Energienetz eines Schiffes. Die Ausgangsspannung des Frequenzumrichters wird dank eines LC-Sinusfilters von PWM in eine sinusförmige Wellenform umgewandelt. Der Transformator eliminiert dann die gemeinsame Spannung und passt ihren Wert an die Anforderungen des Kunden an. Der Netzumrichter erzeugt zusammen mit Elhand-Komponenten eine sinusförmige, galvanisch getrennte und stabile Versorgungsspannung.

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Kunde:
LOTOS Petrobaltic, das einzige polnische Bergbauunternehmen, das in der Exploration und Förderung von Öl und Gas auf dem polnischen Ostseeschelf tätig ist, sowie umfassende Offshore-Logistikdienste, Meereserkundungsdienste und Flottenmanagement anbietet.

Herausforderung:

• Transformatorenkonstruktionen mit unterschiedlichen IP-Schutzarten zur Erfüllung der hohen Sicherheitsstandards auf Bohrplattformen, die unter schwierigen Umgebungsbedingungen arbeiten.
• Bestehen der von der Schiffsklassifikationsgesellschaft (Polski Rejestr Statków S.A., abgekürzt: PRS, deutsch: Polnisches Schiffsregister) vorgeschriebenen Prüfungen.
• Neben der Erfüllung der ungewöhnlichen elektrischen Bedingungen erwartete der Kunde eine Optimierung der Wärmeverluste sowie die Nutzung und Anpassung der Konstruktion an den verfügbaren Raum auf der Plattform.
• Differenzierte Beförderungsart und hoch komplizierte Installation in kleinen Räumen.

Lösung:
Erstellung von individuellen und prototypischen Projekten. Hohe und schlanke, niedrige und breite Transformatoren, die unter schwierigen Umgebungsbedingungen einwandfrei funktionieren. Planung und Durchführung des gesamten logistischen Prozesses, der eine reibungslose und sichere Lieferung und Installation der Transformatoren unter schwierigen Raumverhältnissen auf einer modernisierten Förderplattform ermöglicht.

Ergebnisse:
In den letzten zwei Jahren haben wir im Zusammenhang mit der Modernisierung der Plattform Lotos Petrobaltic eine umfangreiche und vielfältige Serie von Mittel- und Niederspannungstransformatoren mit Leistungen von 125 kVA bis 1600 kVA hergestellt.

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