Components & Solutions for Transformer Manufacturers

On-Load Tap Changer (OLTC) – Advanced Voltage Regulation Systems

We provide high-precision On-Load Tap Changers (OLTC) integrated with state-of-the-art motor drive units and intelligent automatic control panels.

Engineered for 16 MVA, 31.5 MVA, and 63 MVA power transformers, our solutions support both traditional oil-immersed and advanced vacuum technologies. By utilizing industry-leading Maschinenfabrik Reinhausen (MR) components, we ensure every system meets rigorous technical specifications and custom client requirements for maximum grid stability and operational longevity.

Oil Temperature Indicator

A reliable, power-independent solution for monitoring oil and winding temperatures in transformers and reactors. This device’s closed mechanical system ensures high-visibility readings and functional safety for decades without the need for recalibration, combining remote transmission and adjustable control switches into a single rugged unit.

• Accuracy: Class 1 (EN 13190)

Buchholz Relays

The Buchholz relay is the primary protective device for liquid-immersed power transformers and reactors equipped with a conservator. Engineered to detect internal faults at their earliest stages, it monitors gas accumulation, oil leakage, and sudden oil surges. The relay’s “active part” is designed to allow unobstructed oil flow, ensuring that floats and internal mechanisms do not interfere with normal operation.

• Dual Protection Logic: Detects both gradual gas accumulation (incipient faults like overheating or bad contacts) and high-speed oil surges (severe faults like short circuits).
• Advanced Switching: Equipped with 1 to 4 (expandable to 6) magnetic reed-type switches, offering superior reliability over traditional mercury switches.
• Wide Compatibility: Available in nominal pipe diameters from DN25 to DN100, with flanged or threaded connections according to EN 50216-2 and Italian UNEL standards.

Butterfly Valve

Operating Features:

• Tightness of spindle: The tightness to oil leakage from the spindle on the butterfly valve is guaranteed by a set of O-rings on the spindle and on the gland, obtaining an excellent tightness while allowing easy replacement of the gasket. No leakage is tolerated from the spindle in any case.
• Metal-to-metal sealing (thin blade throttle): The oil tightness of the butterfly is obtained by metal-to-metal contact, thus assuring constant performance even after long use. Leakage at the butterfly is checked during assembly, testing with oil at 20°C, 1 bar and viscosity of 30.5 cSt.

The butterfly valves, with metal-to-metal sealing with thin blade (or full tightening type with O-ring blade), are used on power transformers to allow disconnection of a component of the circuit without having to lower the oil below the level of the component itself. This type of valve is preferred over conventional gate valves for its compact overall dimension in the direction of the oil flow.

Bronze Stop Valve (With Padlock Bracket)

The Bronze Stop Valve (With Padlock Bracket) is typically used in marine and industrial applications. It features a rising stem and hand wheel operation for flow control. The body material is bronze, offering excellent corrosion resistance.

• Nominal pressure rating: approximately PN5 (around 5 bar)
• Size: 50 mm (DN50)
• Designed for use with water, oil, or inert gas systems