Resource Center | The H-J Family of Companies
Skip Navigation

RESOURCE CENTER

Our Latest News & Helpful Resources

Subscribe Today
Current Trends
Filters
Content Type

Posts 12

FAQs April 3, 2025
Surge Arrester and Substation Type

Surge arresters are crucial devices that protect electrical systems from voltage spikes caused by lightning and transients. This paper categorizes them into three types: Distribution Arresters (up to 35 kV), Intermediate Class Arresters (up to 72 kV), and Station Class Arresters (over 72 kV). Each arrester type is designed for specific applications to ensure effective protection. Understanding these classifications and the role of substations is essential for proper surge arrester selection.

Read More Download Resource
FAQs April 3, 2025
Joints in Distribution Transformers

Copper-to-aluminum joints are essential in transformers, affecting their performance and reliability. The connection between these dissimilar metals can lead to galvanic corrosion, particularly under varying loads. This paper explores some methods for proper copper-to-aluminum joint design and connection: using hard aluminum, implementing bimetal interfaces, and adopting cold welding techniques. Understanding these strategies is crucial for enhancing the efficiency and longevity of electrical systems.

Read More Download Resource
FAQs April 3, 2025
Breaker Connection for Three-Phase Transformers

This document outlines key considerations for breaker connections in single-phase completely self-protected (CSP) transformers with four low-voltage (LV) bushings, particularly when configured in a bank to supply three-phase loads. It details wiring connections for both 120-240 V and 120 V setups, addressing scenarios where using three single-phase transformers is necessary due to shipping constraints.

Read More Download Resource
FAQs April 3, 2025
Wye and Delta Transformer Connections

When selecting components for transformers, it is essential to understand whether the transformer uses delta (Δ) or wye (Y) connections, as these configurations impact the component selection process.

Read More Download Resource
FAQs
Paralleling Fuses

The use of parallel fuses has become a critical solution for protecting large Padmount-type transformers (4 to 8MVA) in renewable energy applications due to the scarcity of high-current fuses.

Read More Download Resource
2.png
FAQs
Partial Discharges (PDs) in Fuses

Partial Discharges (PDs) in fuses, resulting from electrical stress, can impair fuse functionality and equipment reliability. These discharges often arise from sharp edges of melting elements and are exacerbated in smaller transformers where reduced spacing increases electrical stress.

Read More Download Resource
FAQs
Intelligent Windings Manufacturing Lines

Transformer manufacturers can be faced with difficult decisions when it comes to large-scale investment. Uncertainty can delay large-scale investments resulting in equipment with older technology and inefficient work procedures being left in production.

Read More Download Resource
FAQs
Low Voltage Thermoplastic Bushings for pole mounted transformers electrical and dimensional characteristics

Low voltage bushings are an important component of distribution transformers, whether they are pole mounted or pad mounted, and are often relegated to low priority.

Read More Download Resource
FAQs
Enhanced performance epoxy material for high-temperature applications

Electrical insulating component design has become increasingly challenging due to rapidly changing requirements in power industry applications. Cost reduction and increased performance requirements present new challenges for traditional insulation solutions. Modern insulating component designs must push the limits of dielectric performance while maximizing mechanical strength characteristics in a host of environments.

Read More Download Resource
FAQs
The importance of customizing bushing designs for Wind Turbine MV Transformer applications.

As technology evolves and MV transformers are located in the turbine nacelle next to the generator, it is more important than ever to have the appropriate transformer bushings.

Read More Download Resource
FAQs
Transforming Standards for Pad-Mounted Accessories

IEEE style pad-mounted transformers have been used in the Americas and other parts of the world for a long time. However, it can still be somewhat of an unknown transformer style in some markets.

Read More Download Resource
FAQs
Basics of Forgings and Castings

The H-J Family of Companies has extensive experience with forgings and castings in many ferrous and non-ferrous alloys such as copper, aluminum, stainless steel, etc.

Read More Download Resource