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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.

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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.

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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.

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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.

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Articles
The Growing Demand for Data Centers and the Role of High-Reliability Components in Ensuring Infrastructure Resilience

As data centers expand to meet the growing demand for digital services, the need for high-reliability transformers and switchgear becomes increasingly crucial. Transformers and switchgear play a vital role in distributing electricity, and their components—including bushings and other insulating components, must perform reliably under varying challenging conditions. This paper focuses on the importance of transformers and switchgear and the highreliability components used in them, such as epoxy bushings and insulating components produced by the H-J Family of Companies, in ensuring data center operations and infrastructure resilience. In this paper, we also discuss the special needs of transformers and switchgear in these applications, highlighting how improved materials and designs can enhance transformer and switchgear performance, longevity, and reliability.

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Videos
H-J 2024 Trade Shows

From busy trade show floors to showcasing our cutting-edge solutions, our trade show journey has been a successful one so far. Watch this recap of our recent trade show successes at FISE, CWIEME Berlin, DistribuTECH, and more. Here’s to more growth and future opportunities to meet with customers worldwide.

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Videos
15 kV Epoxy LV Bushing Installation

Need help installing your 15 kV epoxy bushing? H-J has you covered, with a step-by-step video featuring one of our industry experts, showing you how to properly install this bushing for high-voltage distribution transformers! Learn more about the benefits of our epoxy solutions by contacting an H-J rep today.

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Videos
LV Bushing Installation

We’re back with another step-by-step tutorial from one of our industry experts! This time, follow our production engineer as he installs a low voltage bushing in a transformer. To learn more about our low voltage bushings, or other bushings for various transformer applications, contact a H-J sales rep today!

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Videos
HV Bushing Installation

Discover how to install a high-voltage bushing in H-J’s new video.

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Videos
H-J Careers

At The H-J Family of Companies, our people make all the difference. Without our hardworking group of experts, we would not be known as global manufacturing leaders in the heavy electrical industry. Whether you want to take the next step in your career, make a lasting global impact, or find a work place that recognizes hard work and accomplishments, H-J has an opportunity for you!

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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In The News
Transformers Magazine Interviews our CEO Jay Shekelton

The H-J Family of Companies was founded on the very principles that set it apart today – the desire to supply customers with the highest quality products delivered on time at a competitive price.

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In The News
CAM/Cutting Tool Combo Improves Mold Finishes

The H-J Family of Companies is dedicated to continuous improvement of manufacturing processes to provide value for customers and stay at the top of the electrical industry. Combining CAM software, specialty carbide end mills, and reseller support optimizes existing mills for machining molds at an electrical components manufacturer.

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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.

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Articles
Epoxy Resin Portfolio

The H-J Family of Companies is a global leader in the manufacturing and supply of components to the transformer and switchgear OEM and utility markets.

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