OLTC Spares

NGEF Base Plate – Product Description

The NGEF Base Plate is a fundamental structural component used in On-Load Tap Changer (OLTC) systems of power and distribution transformers. It serves as the main supporting foundation for mounting and securing critical components such as contacts, resistors, switching mechanisms, and operating linkages. By providing a stable and rigid base, the base plate ensures proper alignment and smooth functioning of the entire diverter switch assembly.

Manufactured from high-strength, heat-resistant, and corrosion-protected materials, the NGEF Base Plate offers excellent mechanical durability and long-term reliability. Its robust construction enables it to withstand vibration, thermal stress, and continuous operational loads inside the transformer tank. The precision-machined mounting points allow accurate fitting of components, reducing mechanical misalignment and wear.

The base plate also plays an important role in maintaining operational safety by supporting proper spacing between electrical parts and minimizing mechanical movement during switching.

NGEF Collar Gasket – Product Description

The NGEF Collar Gasket is a critical sealing component used in On-Load Tap Changer (OLTC) and diverter switch assemblies of power transformers. It is installed between mating flanges and housings to provide a reliable oil-tight and air-tight seal. By preventing leakage of transformer oil and blocking moisture or contaminants, the collar gasket plays an important role in maintaining internal insulation strength and operational safety.

Manufactured from high-quality oil-resistant rubber and synthetic elastomers, the NGEF Collar Gasket offers excellent elasticity, compression stability, and long service life. Its precision-moulded design ensures uniform pressure distribution across the sealing surface, reducing the risk of seepage and mechanical stress. The gasket is designed to perform consistently under high temperature, pressure, and vibration conditions commonly found in transformer environments.

NGEF Diaphragm – Product Description

The NGEF Diaphragm is a critical safety and pressure-regulating component used in diverter switch assemblies of OLTC systems. It is designed to control internal pressure variations and protect equipment from excessive stress caused by gas generation or oil expansion. By acting as a flexible barrier, the diaphragm helps maintain stable internal conditions during switching operations.

Made from high-quality heat-resistant and oil-compatible materials, the NGEF Diaphragm offers reliable performance under extreme operating conditions. Its precision-moulded structure ensures proper sealing and controlled flexibility, reducing the risk of mechanical damage and system failure. The diaphragm enhances operational safety and prolongs equipment life.

NGEF Knife Lever – Product Description

The NGEF Knife Lever is a vital mechanical linkage component used in On-Load Tap Changer operating mechanisms. It plays a key role in transferring motion between moving parts during tap-changing operations. By enabling precise mechanical movement, the knife lever supports smooth and synchronized switching of transformer taps.

Manufactured from high-strength alloy steel and precision-machined materials, the NGEF Knife Lever provides excellent mechanical stability and long service life. Its corrosion-resistant finish and robust structure allow reliable operation in oil-filled and vibration-prone environments. The lever helps minimize mechanical losses and ensures consistent performance.

NGEF Main Contact with Flexible Connector – Product Description

The NGEF Main Contact with Flexible Connector is a key electrical component used in On-Load Tap Changer (OLTC) systems of power and distribution transformers. It is designed to carry the main load current during normal operation while providing a reliable and stable electrical connection between moving and fixed parts. The flexible connector ensures continuous current flow even during mechanical movement, helping to maintain uninterrupted voltage regulation.

Manufactured using high-quality copper alloys and flexible braided conductors, this main contact offers excellent electrical conductivity and low contact resistance. The flexible shunt absorbs mechanical stress caused by repeated switching operations, vibration, and thermal expansion, thereby protecting the contact surfaces and extending service life. Its robust construction ensures dependable performance under heavy load and harsh operating conditions inside transformer tanks.

NGEF Micro Switch Assembly – Product Description

The NGEF Micro Switch Assembly is an essential control and monitoring component used in On-Load Tap Changer systems. It is designed to detect and signal the position of moving parts during tap-changing operations. By providing accurate electrical feedback to the control system, the micro switch assembly helps ensure safe, synchronized, and reliable switching of transformer taps.

Built with high-quality electrical contacts and durable mechanical housings, the NGEF Micro Switch Assembly delivers consistent performance even under frequent operation. Its compact and rugged construction allows stable functioning in oil-filled and vibration-prone environments. The assembly is designed for precise actuation, long switching life, and easy replacement, helping improve overall OLTC reliability and operational safety.

NGEF Middle Plate – Product Description

The NGEF Middle Plate is an important structural and insulating component used in On-Load Tap Changer (OLTC) systems of power and distribution transformers. It is designed to provide strong mechanical support and accurate alignment for internal components such as contacts, resistors, and switching mechanisms. By maintaining proper spacing and positioning, the middle plate ensures smooth operation and reliable performance of the diverter switch assembly.

Manufactured using high-quality insulating and heat-resistant materials, the NGEF Middle Plate offers excellent electrical insulation and mechanical stability. Its robust construction helps withstand vibration, thermal stress, and continuous operational loads inside the transformer tank. The precision-machined surface ensures correct mounting of components, reducing the risk of misalignment and mechanical failure.

The middle plate also plays a vital role in improving safety by preventing electrical leakage and minimizing the chances of internal flashovers.

NGEF Diverter Switch Moving Contact – Product Description

The NGEF Diverter Switch Moving Contact is a vital mechanical and electrical component used in On-Load Tap Changer (OLTC) systems of power and distribution transformers. It plays a key role in transferring current smoothly between fixed contacts during tap changing operations. Designed for precision movement and reliable electrical conduction, the moving contact ensures stable voltage regulation while the transformer remains in service.

Manufactured using high-quality copper alloys, flexible braided conductors, and high-strength mechanical parts, this moving contact offers excellent conductivity, low resistance, and strong mechanical durability. Its spring-loaded and lever-operated mechanism provides accurate positioning and consistent contact pressure, which helps reduce sparking and contact wear during switching operations. The flexible copper shunt ensures uninterrupted current flow even during repeated movements.

The NGEF Moving Contact is designed to operate reliably under heavy electrical and mechanical stress. Its robust insulation base and corrosion-resistant components protect it from oil contamination, heat, and vibration inside the transformer tank. The maintenance-friendly design allows easy inspection, adjustment, and replacement, helping to minimize downtime and extend service life

NGEF Diverter Switch – 300 Amps

The NGEF 300 Amps Diverter Switch is a reliable and efficient switching device designed for use in On-Load Tap Changer (OLTC) systems of power and distribution transformers. It is engineered to perform smooth tap changing operations under load conditions while maintaining uninterrupted power supply. With a rated current capacity of 300 amperes, this diverter switch is ideal for medium-load transformer applications where stable voltage regulation and consistent performance are essential.

Manufactured using high-quality conductive materials and advanced insulation systems, the NGEF 300A Diverter Switch offers low contact resistance, excellent thermal stability, and long operational life. Its effective arc-control mechanism reduces electrical wear during switching operations, helping to protect internal components and extend service intervals. The strong mechanical structure ensures reliable performance even under continuous operation and varying load conditions.

The diverter switch is designed with precision-engineered main and transition contacts that enable safe current transfer between tap positions. These contacts work in coordination with transition resistors or reactors to prevent short circuits, voltage fluctuations, and electrical disturbances. Its maintenance-friendly design allows easy inspection, cleaning, and replacement of parts, reducing downtime and operational costs.

NGEF Diverter Switch – 500 Amps

The NGEF 500 Amps Diverter Switch is a high-performance switching component designed for use in On-Load Tap Changer (OLTC) systems of power and distribution transformers. It is specially engineered to handle a rated current of up to 500 amperes, ensuring smooth and reliable tap changing under full-load conditions without interrupting the power supply. This makes it an ideal solution for maintaining stable voltage levels and consistent power quality in demanding electrical networks.

Manufactured using premium-grade conductive materials and high-strength insulating components, the NGEF 500A Diverter Switch offers low contact resistance, excellent current-carrying capacity, and superior thermal stability. Its advanced arc-quenching and contact protection system minimizes electrical erosion during switching operations, reducing wear and extending operational life. The rugged mechanical structure provides high durability and dependable performance even under continuous and heavy-load conditions.

The diverter switch is equipped with precision-designed main and transition contacts that enable smooth current transfer between tap positions. These contacts operate in coordination with transition resistors or reactors to prevent short circuits, voltage fluctuations, and transient disturbances. The securely mounted terminals and high-dielectric insulation system ensure safe electrical connections and protection against internal flashovers

NGEF Diverter Switch Cylinder – Product Description

The NGEF Diverter Switch Cylinder is a crucial component used in On-Load Tap Changer (OLTC) systems of power and distribution transformers. It functions as a protective and functional housing for the internal diverter switching mechanism, helping to maintain stable operating conditions during tap-changing operations. By enclosing and supporting critical components, the cylinder ensures smooth current transfer and reliable voltage regulation without interrupting the power supply.

Manufactured from high-quality insulating and heat-resistant materials, the NGEF Diverter Switch Cylinder offers excellent mechanical strength and electrical safety. Its robust cylindrical structure is designed to withstand high electrical stress, oil immersion, temperature variations, and continuous operating loads. The precision-engineered design supports proper alignment of internal parts, reduces vibration, and minimizes wear, resulting in long service life and dependable performance in harsh transformer environments.

NGEF OLTC Wedges – Product Description

The NGEF OLTC Wedges are precision-made insulating and positioning components used in On-Load Tap Changer assemblies. They are designed to maintain correct spacing, alignment, and mechanical stability between internal parts such as contacts and support structures. By ensuring accurate positioning, these wedges help in smooth tap-changing operations and reduce mechanical stress on surrounding components.

Manufactured from high-grade insulating and heat-resistant materials, NGEF OLTC Wedges provide excellent electrical insulation and long-term durability. Their robust construction allows them to withstand oil immersion, temperature variations, and vibration inside transformer tanks. The wedges play a vital role in improving operational reliability and extending the service life of OLTC systems.

NGEF On-Load Tap Changer Transmission Shaft – Product Description

The NGEF On-Load Tap Changer Transmission Shaft is a vital mechanical component used in OLTC systems of power and distribution transformers. It is designed to transmit rotational motion from the drive mechanism to the internal switching and contact assemblies. By ensuring smooth and accurate power transfer, the transmission shaft enables precise tap-changing operations and helps maintain stable voltage regulation without interrupting the power supply.

Manufactured from high-strength alloy steel and precision-machined materials, the NGEF Transmission Shaft offers excellent mechanical durability, dimensional accuracy, and long service life. Its robust construction allows it to withstand continuous rotation, vibration, and mechanical stress inside the transformer tank. The corrosion-resistant and oil-compatible surface treatment ensures reliable performance in harsh operating environments, while its maintenance-friendly design supports easy inspection and replacement during servicing.

NGEF Transformer Diverter Switch – Product Description

The NGEF OLTC diverter switch employs “flag cycle” system of operation. For each phase they have two main contacts, two switching contacts and two resistor contacts. Transition resistance is connected in connected in series with resistor contact and are important because they ensure that he load current is transferred from one tap to other without interruption .

The NGEF Transformer Diverter Switch is an essential component used in On-Load Tap Changer (OLTC) systems for power and distribution transformers. It is designed to regulate transformer voltage smoothly while the transformer is in operation, without interrupting the power supply. By enabling safe and reliable tap changing under load conditions, the diverter switch helps maintain stable voltage levels and improves overall power quality in electrical networks.

Manufactured using high-grade conductive and insulating materials, the NGEF Diverter Switch offers high current-carrying capacity, low contact resistance, and excellent mechanical strength. Its advanced arc-control system minimizes contact wear and reduces electrical stress during switching operations, thereby extending the service life of both the switch and the transformer. The robust construction ensures reliable performance even in harsh operating environments and heavy-load conditions