Note, that this “making or breaking” of the electrical current is typically accomplished by someone with a “hot stick” from the local utility or a trained electrician.
The two most common types of load break switches are the 2 position switch and the 4 position switch.
The 2 Position Switch is exactly what it sounds like: on or off. That’s it! The 4 Position Switch, however, allows for a little more functionality. It’s used for a loop feed transformer.
The four positions are as follows:
Position 1 - A-side on and the transformer on (energized)
Position 2 - B-side on and the transformer on
Position 3 - A & B-side on and the transformer on
Position 4 - A & B-side on with the transformer off (not energized)
When the transformer is in Position 4 then it is just feeding through. The bushings are energized but the transformer itself is not.
Hope you found this information helpful and if you get a chance check out our short 1 min video that explains all this too.
Today, I’ll give you a quick rundown on the difference between live front bushings and dead front bushings.
First, a bushing is an insulator that allows a conductor to pass safely through the tank wall of a transformer without making electrical contact with it.
So what is a live front bushing?
It’s called live because the terminal is actually exposed. There is electricity flowing through it. Touching a live front bushing could result in electrocution. Matter of fact, you don’t want to even get too near due arc-flash concerns.
The bushing itself has several components. A spade is at the top of the bushing. This is the place where the actual termination is made with a mechanical lug or a crimp lug. Below the spade are the bushings made up of little ridges called waffles or sheds. These waffles help protect against something called creep. Creep is where a tiny arch travels across a surface area by “creeping” along with some small amount of water, dust, or oil. Waffles provide the necessary clearance to prevent creep by providing a larger amount of surface area. Finally, there is a stud where bushing internally connects to the core and coil.
What is a dead front bushing?
The majority of padmount transformers these days come with dead front bushings. It does the exact same thing as a live front bushing but it uses a fully insulated bushing. The obvious benefit is that you can open the cabinet and there is a very low risk of arch-flash. The fully rubber dead front bushing is terminated using a loadbreak elbow.
Both options have their suitable applications.
what is a dead front bushing
what is a live front bushing
EMRCO has been one of America’s premier manufacturers of distribution liquid-filled transformers for nearly half a century. And now Maddox is proud to partner with ERMCO as their sole sales representative in the Commercial and Industrial Market.
This partnership combines ERMCO high quality electrical craftsmanship with Maddox’s world-class customer service and modern logistics. Now it’s easier than ever to get the transformer you need, when you need it.
Looking for pricing? Contact us today at 800-270-2011
Let’s us know if you have any questions about this partnership or about any particular transformer need! These are exciting times for the transformer industry!
This article is primarily discussing medium voltage, oil-filled distribution transformers, but the same logic can be applied to most other types of transformers as well.
To begin with, we should first understand why buying a reconditioned transformer, unlike so many other types of reconditioned equipment, is a sound consideration. Not all equipment easily lends itself to being reconditioned by nature of its design. This isn’t the case with most transformers.
Looking for pricing? Contact us at 1-800-270-2011
Why Transformer Reconditioning Is Practical
For a product to be economically practical for reconditioning, it must meet the following criteria:
Transformers meet all three requirements!
Having established that there is indeed an economic case of remanufactured transformers, we should now analyze the benefits and risks.
1) Speed Of Delivery
New transformer manufacturing lead-times in the US stand between 10 and 30 weeks depending on market conditions. This time frame is simply not an option for many projects, especially emergency replacement situations. Maddox reconditioning lead-times stand between 1 and 3 weeks. Additionally, the US has one of the oldest, and therefore most colloquial distributions systems, meaning that dozens of different distribution voltages exist. This lack of standardization means that almost every single transformer is still engineered-to-order to this day. The cost to maintain a sufficient inventory is far outside the scope of most electrical distributors. This creates an opportunity for rebuilders to maintain an inventory with a broad range of voltages to fill needs as they arise.
2) Lower Cost
Remanufactured transformers tend to be between 10% and 40% lower cost than new. But what about power cost savings with new, more efficient designs? While slight efficiency gains have been made in transformer design (around 1-2% as of DOE 2016) the savings in power bills from the utility will never offset the added upfront cost for a new transformer.
3) Lower Risk Of Failure
The vast majority of transformer failures happen immediately upon energization. Relatively few failures occur between year 3 and year 30 of service. Which means that if a transformer has been successfully been energized, served for a time, and then removed from service with no issues, the secondary buyer of such a unit has the added insurance of getting a transformer that has truly been proven in the field.
4) Lower Environmental Impact
Some propose that newer, more efficient transformers are more environmentally friendly due to lower losses. However, the slight efficiency gains made in recent years will never offset the environmental impact of manufacturing a new transformer. According to the EPA, manufacturing produces 5 percent of total U.S. greenhouse gas emissions. The rebuilding process produces almost no green house gasses. So go green, and buy reconditioned!
1) Issues Created By Low-quality Rebuilders
The transformer may have been taken out of service with no issues, but a low quality rebuilder may have introduced an issue not previously present through poor workmanship.
2) Shortened Life-span Due To Unknown History
A previous owner may have gotten rid of the transformer because of some known issue.
Minimizing The Risks
A quality rebuilder can easily offset these considerable risks. This why it’s key that you qualify not just the product but also the rebuilder. Before buying any reconditioned transformer, make sure that the company producing the transformer can, at a minimum...
Transformer reconditioning has been a niche industry nearly since the invention of the technology. Buying a reconditioned transformer is often an excellent option when needing to make project deadlines and budgets. New is not necessarily better than reconditioned, but you should always do your due diligence, and qualify the rebuilder to ensure you are getting a quality product.
Maddox Industrial Transformer specializes in new and reconditioned 3-phase transformers, keeping thousands in stock at all times. Contact us today to see how we can help you! Whatever your needs, Maddox has both new and recondition solutions for your project.
*More About DGA Results
The oil inside a transformer acts as an electrical insulator, and as a cooling medium. But it also gives us an excellent diagnostic tool. Any internal issue with the transformer (such as arcing, or overheating) changes the chemical makeup of the fluid, and produces combustible gasses. These gasses are easily tested for via DGA testing. This testing gives you an idea of the unit’s history. If some gasses do show up, the rebuilder should be able to explain why they are present, and what they intend to do to fix the issue that caused the gassing in the first place. Transformers that have been “run hard” by over-heating, or over-loading often have some gas build-up caused by insulation paper breakdown. It is important to know the condition of the transformer prior to rebuilding to make a determination. Some low-quality rebuilders will simply replace the oil with new in an attempt to erase the evidence of abuse.
Remanufactured and reman transformers, refurb, or refurbished transformer
Recently, when thousands of residents, tourists and businesses were left in the dark on the Outer Banks of North Carolina, Maddox Industrial Transformer was called into action to assist in getting power restored.
With this time of year being peak vacation season on the islands, this power outage left thousands of residents facing evacuation, threatened the loss of extensive annual revenue for local businesses and ended many families’ beach vacations on a less than happy note.
Upon receiving the call for help, Maddox was ready and able to supply six (6) 2500 KVA Transformers. Having these units in stock at our Simpsonville, SC headquarters, our highly skilled technicians were able to have them ready to ship the same day that the emergency request was made.
This is all in a day’s work at Maddox. With 8 locations nationwide and thousands of new and reconditioned transformers (liquid-filled and dry-type) in stock and ready to ship, Maddox Industrial Transformer is just a call away to help get the lights back on when your power goes out!
Please give us a call or e-mail us with any transformer needs you may have!
Maddox Industrial Transformer, LLC.
800-270-2011 - email@example.com
Solomon Corporation and Maddox Industrial Transformer are collaborating to create a powerful Alliance Partnership designed to meet and exceed customer’s needs in critical situations.
Tom Hemmer, CEO of Solomon Corporation and Randall Maddox, Founder of Maddox Industrial Transformer made the announcement today.
Solomon Corporation has been a leader in transformer sales and service for more than forty years. With four locations nation-wide, unmatched technical support and a full line inventory of transformers for re-sale, Solomon is uniquely capable of providing a wide range of products and services for utility and industrial markets.
Maddox Industrial Transformer was formed by a leadership team with decades of transformer experience in the quick ship commercial and industrial transformer markets. The team’s experience in providing high quality work with short lead-times is making them invaluable to commercial and industrial market customers.
By combining strengths in fulfillment, purchasing, and inventory management the alliance will provide customers with unparalleled availability, speed and ease of doing business with total US geographic coverage.
“Randall Maddox pioneered the quick-ship industrial transformer model during his time at Sunbelt. His team brings experience, expertise and customer relationships it would have taken us decades to build on our own,” said Tom Hemmer, CEO of Solomon Corporation. “Together with Solomon Corporation’s capabilities, inventory and geographic reach we will very quickly become the one-call transformer solution for industrial, commercial and utility customers.”
“We are thrilled to be associated with Solomon Corp. Their sales force, customer base, vast inventory, and technical capability greatly enhances the service we can deliver. We share a commitment to excellence in product and customer service.” - Camden Spiller, CEO and Randall Maddox, Founder, Maddox Industrial Transformer.
While maintaining independent ownership, the two companies will utilize this Alliance to provide the best in industry service to new and existing customers.